MAX40016EVKIT [MAXIM]
Integrated Current Sense Element;
| 型号： | MAX40016EVKIT |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Integrated Current Sense Element |
| 文件： | 总22页 (文件大小：940K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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MAX40016
4-Decade Current Sense Amplifier
with Integrated Current Sense Element
General Description
Benefits and Features
● Integrated Current Sense Element Saves The Space
The MAX40016 is a very wide range current sense amplifier
(CSA) with internal sense element that senses from less
than 300µA to greater than 3A current range. The 4-decade
sensed current functions with 1% (typical) gain error and
offers three, multiplexed programmable output ranges in
order to interface with 12-bit ADCs. Having an integrated
sense element has the extra advantage that the entire
current measuring path can be factory-trimmed, saving the
user from having to calibrate independent sense resistors
and CSAs. The MAX40016 (WLP package) drops a typical
of 60mV at 3A from the voltage input to load output.
and Cost of Expensive Precision Sense Resistors
● 4-Decade Measurement Range
• Maintains Accuracy from < 300µA to > 3A
● Withstands Overloads to 4A
● Low Voltage Drop Across Sense Element
• 60mV (Active Mode, 3A Load, WLP Package)
• 35mV (Low Power Mode, 3A Load, WLP Package)
● Three Multiplexed Scaling Resistor Outputs Allow
Full Dynamic Range while Interfaced to 12-bit ADCs
The MAX40016's integrated current-sensing element
saves the space and cost of an external high-power,
precision current sense resistor. The MAX40016 is offered
in an ultra-tiny, 1.98mm x 1.31mm, 15-bump wafer-
level package (WLP), further reducing board space. The
MAX40016 is also available in a 4mm x 4mm 16-pin
TQFN package.
● +2.5V to +5.5V Input Supply Voltage Range
● Low Power Mode Reduces Supply Current to 10µA
Max
● Space-Saving
• Tiny 1.98mm x 1.3mm, 15-Bump WLP
• 4mm x 4mm 16-Pin TQFN
The MAX40016 operates with a supply voltage from 2.5V
to 5.5V. The device features a low-power mode in which
the current-sensing element remains on, but the outputs
are turned off to reduce the total supply current below
10µA (max).
● -40°C to +125°C Operating Temperature Range
Ordering Information appears at end of data sheet.
The MAX40016 also includes a committed on-board
amplifier with an internal gain of 1.5V/V. The MAX40016
operates over the -40°C to +125°C temperature range.
Applications
● Mobile Devices
● RF Power Monitoring
● Portable Instruments
19-100232; Rev 2; 11/18
MAX40016
4-Decade Current Sense Amplifier
with Integrated Current Sense Element
Simplified Block Diagram
INPUT 2.5V to 5.5V
MEASURED
CURRENT
CLD
AT UP TO 3A
CIN
R
ISH
LD
V
DD
ISH
MAX40016
160Ω
R
ISM
ISM
CURRENT
MI RROR
5.36kΩ
CONTROL
R
ISL
ISL
160kΩ
SEL0
SEL1
RANGE
SELECTION
FROM
CONTROLLER
VOUT
ROUT
COUT
GNDS
GND
Maxim Integrated
│ 2
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MAX40016
4-Decade Current Sense Amplifier
with Integrated Current Sense Element
Absolute Maximum Ratings
DD
V
to GND ............................................................-0.3V to +6V
Continuous Power Dissipation (T = +70°C)
A
GND to GNDS......................................................-0.3V to +0.3V
SEL0, SEL1, ISL, ISM, ISH, V to GND ..-0.3V to V +0.3V
15-Bump WLP (derate 14.39mW/°C above +70°C).....1151.2mW
16-Pin TQFN (derate 25mW/°C above +70°C) .............2000mW
Operating Temperature Range......................... -40°C to +125°C
Junction Temperature......................................................+150°C
Storage Temperature Range............................ -65°C to +150°C
Soldering Temperature (reflow).......................................+260°C
OUT
DD
V
to LD...............................................................-0.3V to 0.3V
DD
LD to GND......................................... V
- 0.3V to V
+ 0.3V
DD
DD
Maximum Current
( All pins except V , LD, continuous)...........................20mA
DD
Current from V
to LD (Continuous).....................................4A
DD
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Package Information
15 WLP
PACKAGE CODE
N151B1+1
Outline Number
21-100213
Land Pattern Number
Refer to Application Note 1891
THERMAL RESISTANCE, MULTI-LAYER BOARD:
Junction to Ambient (θ
)
69.5°C/W
N/A
JA
Junction to Case (θ
)
JC
16 TQFN
PACKAGE CODE
T1644+4
Outline Number
21-0139
90-0070
Land Pattern Number
THERMAL RESISTANCE, MULTI-LAYER BOARD:
Junction to Ambient (θ
)
40°C/W
6°C/W
JA
Junction to Case (θ
)
JC
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”,
“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board.
For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
Electrical Characteristics
(V
= 3.6V, I = 300mA, C = 10μF, SEL0 = V , SEL1 = V
(ISH range is selected), T = T
A
to T
, unless otherwise noted.
MAX
DD
LD
LD
DD
DD
MIN
Typical values are at T = +25°C (Note 1))
A
PARAMETER
CURRENT SENSING
Supply Voltage
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
V
Guaranteed by PSRR
No I current, V = 0V
2.5
5.5
1.2
V
DD
Supply Current (Active)
I
0.8
5
mA
DD
LD
ISX
Low-power mode (SEL0 = 0V, SEL1 =
0V), no I current, V = 0V
Supply Current (Low-Power Mode)
Power-Up Time
I
10
µA
µs
DD_LP
LD
ISX
Measure at 50% of VOUT.
100
∆Gain Error/∆V , measured at ISX
(Note 2)
DD
Power Supply Rejection Ratio
PSRR
-0.6
+0.2
+0.6
%/V
Maxim Integrated
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MAX40016
4-Decade Current Sense Amplifier
with Integrated Current Sense Element
Electrical Characteristics (continued)
(V
= 3.6V, I = 300mA, C = 10μF, SEL0 = V , SEL1 = V
(ISH range is selected), T = T
A
to T
, unless otherwise noted.
MAX
DD
LD
LD
DD
DD
MIN
Typical values are at T = +25°C (Note 1))
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Active mode,
= 3A
(Note 6)
-40°C < T < +85°C
60
90
A
I
LD
-40°C < T < +125°C
A
100
-40°C < T < +85°C
A
50
35
80
95
50
Active mode,
I
= 2A
-40°C < T < +125°C
A
LD
Voltage Drop (V
to LD) (WLP)
mV
DD
Low power
-40°C < T < +85°C
A
mode, I = 3A
(Note 6)
LD
-40°C < T < +125°C
A
55
-40°C < T < +85°C
A
23
35
Low power
mode, I = 2A
LD
-40°C < T < +125°C
A
35
-40°C < T < +85°C
A
160
160
120
120
150
230
250
180
200
220
Active mode,
I
= 3A (Note 6)
-40°C < T < +125°C
A
LD
-40°C < T < +85°C
A
Active mode,
= 2A
I
-40°C < T < +125°C
A
LD
Voltage Drop (V
Current Gain
to LD) (TQFN)
mV
DD
Low power
-40°C < T < +85°C
A
mode, I = 3A
(Note 6)
LD
-40°C < T < +125°C
A
150
230
-40°C < T < +85°C
A
100
100
2
150
160
Low power
mode, I = 2A
LD
-40°C < T < +125°C
A
G
I
/I , measured at ISX
ISX LD
mA/A
I
-40°C < T < +85°C
A
-4
-4
+0.9
+0.9
+0.9
+4
+4
R
I
= 160Ω,
= 3A (Note 6)
ISX
-40°C < T < +125°C
A
LD
-40°C < T < +85°C
A
-3.5
-4
+3.5
+4
R
I
= 160Ω,
= 300mA
ISX
-40°C < T < +125°C
A
LD
-40°C < T < +85°C
A
-3.5
-4
+0.7
+1.4
+1.7
+2.8
+3.5
+4
R
I
= 5.36kΩ,
= 30mA
ISX
-40°C < T < +125°C
A
LD
Current Gain Error
G
%
I_ERR
-40°C < T < +85°C
A
-6
+6
R
I
= 160kΩ,
= 3mA
ISX
-40°C < T < +125°C
A
-7
+7
LD
-40°C < T < +85°C
A
-12
-15
-25
-30
+12
+15
+25
+30
R
I
= 160kΩ,
= 1mA
ISX
-40°C < T < +125°C
A
LD
-40°C < T < +85°C
A
R
I
= 160kΩ,
= 300μA
ISX
-40°C < T < +125°C
A
LD
R
= 160Ω,
= 30mA to 3A
ISX
0.4
0.8
1.7
I
LD
Measured at
ISX
R
= 5.36kΩ,
ISX
= 3mA to 30mA
Nonlinearity Current Gain Error
G
%
I_ERR(NON)
I
LD
R
= 160kΩ,
= 300μA to 3mA
ISX
I
LD
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MAX40016
4-Decade Current Sense Amplifier
with Integrated Current Sense Element
Electrical Characteristics (continued)
(V
= 3.6V, I = 300mA, C = 10μF, SEL0 = V , SEL1 = V
(ISH range is selected), T = T
A
to T
, unless otherwise noted.
MAX
DD
LD
LD
DD
DD
MIN
Typical values are at T = +25°C (Note 1))
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
%/V
R
= 160Ω,
ISX
0.02
0.02
I
= 2A
LD
Measured at
ISX,
R
= 5.36kΩ,
ISX
CMRR_ISX (Note 3)
0V < V
1.1V
<
I
= 100mA
LD
ISX
R
= 160kΩ,
ISX
0.06
20
I
= 1mA
LD
ISX Residual Current
I
= 0
nA
LD
AMPLIFIER/DC CHARACTERISTICS
Guaranteed by Output Amplifier Gain
Error
0.01 to
1.0
Typical Input Voltage
Offset Voltage
V
V
Input referred (Note 4)
20
µV
OS
∆V
2.5V < V
/∆V
V
= 1.0V,
OUT
DD, ISX
PSRR_VOUT
0.2
mV/V
< 5.5V
DD
Output Amplifier Gain
G
1.5
V/V
%
V
Output Amplifier Gain Error
G
0.01V < V
< 1V
-1
+0.2
+1
1
V_ERR
ISX
∆V
/∆I
, sourcing 0 and 2mA,
OUT OUT
0.1
0.1
5
V
= 1.0V,
ISX
Output Load Regulation
Ω
∆V
/∆I
, sinking 0 and 500μA,
OUT OUT
1
V
= 10mV
ISX
Leakage Current Into V
(Low Power Mode)
OUT
SEL0 = 0V, SEL1 = 0V, at V
= 1.5V
100
nA
OUT
Max Sink Current
V
V
= 0V, V
= 1.65V, pulsed test
28
28
mA
mA
ISX
OUT
Max Source Current
= 1.1V, V
= 0V, pulsed test
ISX
OUT
0.003
Total Transimpedance Gain
R
R
connected to ISX pins
ISX
x R
ISX
= 160Ω,
ISX
-40°C < T < +85°C
-4
-4
+0.9
+4
+4
A
I
= 3A
LD
-40°C < T < +125°C
A
+0.9
1
(Note 6)
-40°C < T < +85°C
A
-3.5
-4
+3.5
+4
R
I
= 160Ω,
ISX
= 300mA
-40°C < T < +125°C
A
LD
-40°C < T < +85°C
A
-3.5
-4
+0.8
+1.5
+1.8
+3
+3.5
+4
R
I
= 5.36kΩ,
= 30mA
ISX
Total Transimpedance Gain Error
-40°C < T < +125°C
A
LD
%
(Measured at V
)
OUT
-40°C < T < +85°C
A
-6
+6
R
I
= 160kΩ,
= 3mA
ISX
-40°C < T < +125°C
A
-7
+7
LD
-40°C < T < +85°C
A
-12
-15
-25
-30
+12
+15
+25
+30
R
I
= 160kΩ,
= 1mA
ISX
-40°C < T < +125°C
A
LD
-40°C < T < +85°C
A
R
I
= 160kΩ,
= 300μA
ISX
-40°C < T < +125°C
A
LD
Maxim Integrated
│ 5
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MAX40016
4-Decade Current Sense Amplifier
with Integrated Current Sense Element
Electrical Characteristics (continued)
(V
= 3.6V, I = 300mA, C = 10μF, SEL0 = V , SEL1 = V
(ISH range is selected), T = T
A
to T
, unless otherwise noted.
MAX
DD
LD
LD
DD
DD
MIN
Typical values are at T = +25°C (Note 1))
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
R
R
R
= 160Ω, I = 100mA to 3A
0.4
0.8
1.7
ISX
ISX
ISX
LD
Nonlinearity Total Transimpedance
= 5.36kΩ, I = 3mA to 100mA
%
LD
Gain Error (Measured at V
)
OUT
= 160kΩ, I = 300μA to 3mA
LD
AMPLIFIER/AC CHARACTERISTICS
R
= 160kΩ, I = 3mA DC and
LD
ISX
1
30μA , C = 0
PP LD
Small Signal Bandwidth
MHz
kHz
R
= 160Ω, I = 300mA_DC and
LD
ISX
0.7
300
3mA , C = 0
PP LD
R
C
= 160Ω, I = 2A_DC and 1A
,
PP
ISX
LD
LD
Large Signal Bandwidth
= 0
R
R
R
= 160kΩ, I = 1mA ↔ 2mA
220
70
60
25
11
µs
μs
µs
ISX
ISX
ISX
LD
Load Transient Response Time
= 5.36kΩ, I = 30mA ↔ 60mA
LD
= 160Ω, I = 1A ↔ 2A
LD
Output Noise 1/f
0.1Hz to 10Hz
µV
PP
Output Integrated Noise
100Hz to 10kHz
µV
RMS
RANGE SELECT INPUTS (SEL0, SEL1)
Input High Level
Input Low Level
V
SEL0 and SEL1
SEL0 and SEL1
1
V
V
IH
V
0.5
0.5
IL
V
= V
, SEL0 and SEL1 have
IH
VDD
I
IH
weak pulldowns
Input Current
µA
V
= 0V, SEL0 and SEL1 have weak
IL
I
0.5
IL
pulldowns
Low Power Mode, Sleep Delay
Low Power Mode, Waking Delay
t
I
= 30mA (Note 5)
5
μs
μs
DIS
LD
R
R
R
= 160Ω, I = 300mA (Note 5)
30
ISX
ISX
ISX
LD
t
= 5.36kΩ, I = 30mA (Note 5)
50
EN
LD
= 160kΩ, I = 1mA (Note 6)
550
LD
Measured from 50% level of SEL0
or SEL1 to the 50% rise of the ISX
current
Range Control Delay
6
μs
Note 1: Limits are 100% tested at T = +25°C. Limits over the temperature range and relevant supply voltage range are guaranteed
A
by design and characterization.
Note 2: ISX is any one of the ISL, ISM or ISH pins.
Note 3: CMRR_ISX is calculated as (∆I
/ I ) / ∆V
.
ISX
ISX ISX
Note 4: Guaranteed by circuit architecture.
Note 5: Measured from 50% level of SEL0 or SEL1 edge to 50% reduction in the ISX current.
Note 6: Guaranteed by design.
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│ 6
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MAX40016
4-Decade Current Sense Amplifier
with Integrated Current Sense Element
Typical Operating Characteristics
V
=3.6V, I =300mA, C =10μF, R
=10kΩ, C
=10pF, R
=160Ω, R
=5.36kΩ, R =160kΩ(pertheMAX40016EVkit).
DD
LD
LD
OUT
OUT
ISH
ISM ISL
Typical values are at T = +25°C, unless otherwise noted. (ISX is any one of the ISL, ISM or ISH pins.)
A
IDD vs. VDD vs. TEMPERATURE
(ACTIVE MODE)
IGND+GNDS vs. VDD vs. TEMPERATURE
(ACTIVE MODE)
IDD vs. VDD vs. TEMPERATURE
(LOW POWER MODE)
toc01
toc02
toc03
1
0.95
0.9
2
1.8
1.6
1.4
1.2
1
7
6.5
6
ILD = 0
ILD = 300mA
ILD = 0
TA = +125°C
TA = +125°C
TA = +125°C
0.85
0.8
5.5
5
4.5
4
0.75
0.7
TA = +85°C
TA = +25°C
3.5
3
0.65
0.6
TA = +85°C
TA = -40°C
TA = -40°C
TA = +25°C
TA = +85°C
TA = +25°C
2.5
2
0.55
0.5
TA = -40°C
2.5
2.5
0.1
3
3.5
4
4.5
5
5.5
2.5
3
3.5
4
4.5
5
5.5
2.5
3
3.5
4
4.5
5
5.5
VDD (V)
VDD (V)
VDD (V)
VDD–VLD DROP vs. ILD
(ACTIVE MODE, WLP)
VDD-VLD DROP vs. VDD
(ACTIVE MODE)
IGND+GNDS vs. ILD
toc04
toc05
toc06A
10
8
41.5
41.4
41.3
41.2
41.1
41
100
90
80
70
60
50
40
30
20
10
0
ILD = 300mA
TA = +125°C
TA = +85°C
6
4
40.9
40.8
40.7
40.6
40.5
2
TA = +25°C
TA = -40°C
0
0.1
1
10
100
1000
10000
3
3.5
4
4.5
5
5.5
0.1
1
10
100
1000
10000
ILD (mA)
VDD (V)
ILD (mA)
VDD-VLD DROP vs. ILD
(LOW-POWER DOWN MODE, WLP)
VDD-VLD DROP vs. ILD
(LOW-POWER DOWN MODE, TQFN)
VDD–VLD DROP vs. ILD
(ACTIVE MODE, TQFN)
toc07A
toc6B
toc7B
100
10
260
240
220
200
180
160
140
120
100
80
1000
100
10
-40°C
-40°C
+25°C
+85°C
+125°C
+25°C
+85°C
+125°C
1
1
0.1
0.1
60
0.01
0.001
40
0.01
0.001
BLUE TA = -40°C, GREEN TA = +25°C,
ORANGE TA = +85°C, RED TA = +125°C
20
0
1
10
100
1000
10000
0.0003
0.003
0.03
0.3
3
0.01
0.1
1
10
100
1000 10000
ILD (mA)
ILD (mA)
ILD (mA)
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MAX40016
4-Decade Current Sense Amplifier
with Integrated Current Sense Element
Typical Operating Characteristics (continued)
V
=3.6V, I =300mA, C =10μF, R
=10kΩ, C
=10pF, R
=160Ω, R
=5.36kΩ, R =160kΩ(pertheMAX40016EVkit).
DD
LD
LD
OUT
OUT
ISH
ISM ISL
Typical values are at T = +25°C, unless otherwise noted. (ISX is any one of the ISL, ISM or ISH pins.)
A
PSRR (ΔCURRENT GAIN ERROR/ΔVDD)
ISX RESIDUAL CURRENT vs. VDD
(ILD = 0)
SEL_ VOLTAGE LEVELS vs. VDD
vs. TEMPERATURE (AT ISL)
toc10
toc9
toc08
1
0.9
0.8
0.7
0.6
0.5
250
200
150
100
50
0.5
0.4
0.3
0.2
0.1
0
TA = +125°C
VIH
ILD = 1mA
VIL
TA = +85°C
ILD = 30mA
TA = -40°C
TA = +25°C
ILD = 1A
0
2.5
3
3.5
4
4.5
5
5.5
2.5
3
3.5
4
4.5
5
5.5
-50
-25
0
25
50
75
100 125
VDD (V)
TEMPERATURE(°C)
VDD (V)
BUFFER STABILITY vs. CAPACITIVE LOAD
SEL_ INPUT CURRENT
vs. SEL_ INPUT VOLTAGE
BUFFER STABILITY RESISTIVE LOAD
vs. CAPACITIVE LOAD
AND SERIES ISOLATION RESISTOR
toc11
toc12
toc13
9
8
7
6
5
4
10
1
1000
100
10
STABLE
UNSTABLE
0.1
STABLE
0.01
0.001
UNSTABLE
0
0.4 0.8 1.2 1.6
2
2.4 2.8 3.2 3.6
30
300
3000
30000
300000
0.1
1
10
100
1000
CAPACITIVE LOAD (pF)
SEL_ VOLTAGE (V)
RESISTIVE LOAD (kΩ)
BUFFER GAIN ERROR vs. VISX
BUFFER GAIN ERROR vs. VISX
BUFFER GAIN ERROR vs. VISX
toc14B
toc14A
toc14C
0.4
0.3
0.2
0.1
0
0.4
0.3
0.2
0.1
0
0.4
0.3
0.2
0.1
0
VDD = 2.5V
VDD = 3.6V
VDD = 5.5V
RISX = 5357.7Ω
VDD = 2.5V
VDD = 3.6V
VDD = 5.5V
VDD = 2.5V
VDD = 3.6V
VDD = 5.5V
RISX = 5357.7Ω
RISX = 5357.7Ω
TA = +25°C
TA = -40°C
TA = +85°C
-0.1
-0.1
-0.1
1
10
100
VISX (mV)
1000
1
10
100
1000
1
10
100
VISX (mV)
1000
VISX (mV)
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MAX40016
4-Decade Current Sense Amplifier
with Integrated Current Sense Element
Typical Operating Characteristics (continued)
V
=3.6V, I =300mA, C =10μF, R
=10kΩ, C
=10pF, R
=160Ω, R
=5.36kΩ, R =160kΩ(pertheMAX40016EVkit).
DD
LD
LD
OUT
OUT
ISH
ISM ISL
Typical values are at T = +25°C, unless otherwise noted. (ISX is any one of the ISL, ISM or ISH pins.)
A
CURRENT GAIN ERROR vs. ILD
CURRENT GAIN ERROR vs. ILD
BUFFER GAIN ERROR vs. VISX
toc14D
toc15B
toc15A
0.4
0.3
0.2
0.1
0
10
9
8
7
6
5
4
3
2
1
0
10
9
8
7
6
5
4
3
2
1
0
VDD = 2.5V
RISX = 5357.7Ω
RISX = 5357.7Ω
VDD = 2.5V
VDD = 2.5V
RISX = 5357.7Ω
VDD = 3.6V
VDD = 5.5V
VDD = 3.6V
VDD = 5.5V
VDD = 3.6V
VDD = 5.5V
TA = +25°C
TA = +125°C
TA = -40°C
-0.1
1
10
100
1000
0.0001
0.001
0.01
0.1
VISX (mV)
0.0001
0.001
0.01
0.1
ILD (A)
ILD (A)
CURRENT GAIN ERROR vs. ILD
CURRENT GAIN ERROR vs. ILD
TOTAL GAIN ERROR vs. ILD
toc15c
toc15D
toc16A
10
9
8
7
6
5
4
3
2
1
0
14
13
12
11
10
9
8
7
6
5
10
VDD = 2.5V
VDD = 2.5V
RISX = 5357.7Ω
RISX = 5357.7Ω
VDD = 2.5V
RISX = 5363.7Ω
9
8
7
6
5
4
3
2
1
VDD = 3.6V
VDD = 5.5V
VDD = 3.6V
VDD = 5.5V
VDD = 3.6V
VDD = 5.5V
TA = +85°C
TA = -40°C
TA = +125°C
4
3
2
1
0
0
0.0001
0.001
0.01
0.1
0.0001
0.001
0.01
0.1
0.0001
0.001
0.01
0.1
ILD (A)
ILD (A)
ILD (A)
TOTAL GAIN ERROR vs. ILD
TOTAL GAIN ERROR vs. ILD
TOTAL GAIN ERROR vs. ILD
toc16D
toc16B
toc16C
14
10
10
9
8
7
6
5
4
3
2
1
0
VDD = 2.5V
13
12
11
10
9
8
7
6
5
4
3
2
1
VDD = 2.5V
RISX = 5363.7Ω
VDD = 2.5V
RISM = 5357.7Ω
9
8
7
6
5
4
3
2
1
RISX = 5357.7Ω
VDD = 3.6V
VDD = 5.5V
VDD = 3.6V
VDD = 5.5V
VDD = 3.6V
VDD = 5.5V
TA = +85°C
TA = +125°C
TA = +25°C
0
0
0.0001
0.001
0.01
0.1
0.0001
0.001
0.01
0.1
0.0001
0.001
0.01
0.1
ILD (A)
ILD (A)
ILD (A)
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MAX40016
4-Decade Current Sense Amplifier
with Integrated Current Sense Element
Typical Operating Characteristics (continued)
V
=3.6V, I =300mA, C =10μF, R
=10kΩ, C
=10pF, R
=160Ω, R
=5.36kΩ, R =160kΩ(pertheMAX40016EVkit).
DD
LD
LD
OUT
OUT
ISH
ISM ISL
Typical values are at T = +25°C, unless otherwise noted. (ISX is any one of the ISL, ISM or ISH pins.)
A
BUFFER GAIN ERROR vs. VISX
BUFFER GAIN ERROR vs. VISX
BUFFER GAIN ERROR vs. VISX
toc17C
toc17B
toc17A
0.4
0.3
0.2
0.1
0
0.4
0.3
0.2
0.1
0
0.4
0.3
0.2
0.1
0
VDD = 2.5V
VDD = 2.5V
VDD = 2.5V
RISX = 160Ω
RISX = 160Ω
RISX = 160Ω
VDD = 3.6V
VDD = 5.5V
VDD = 3.6V
VDD = 5.5V
VDD = 3.6V
VDD = 5.5V
TA = +85°C
TA = +25°C
TA = -40°C
1
10
100
VISX (mV)
1000
1
10
100
1000
1
10
100
1000
VISX (mV)
VISX (mV)
CURRENT GAIN ERROR vs. ILD
BUFFER GAIN ERROR vs. VISX
CURRENT GAIN ERROR vs. ILD
toc18B
toc17D
toc18A
3
2
1
0
0.4
0.3
0.2
0.1
0
3
2
1
0
VDD = 2.5V
VDD = 2.5V
VDD = 3.6V
VDD = 5.5V
VDD = 2.5V
VDD = 3.6V
VDD = 5.5V
RISX = 160Ω
RISX = 160Ω
RISX = 160Ω
VDD = 3.6V
VDD = 5.5V
TA = -40°C
TA = +25°C
TA = +125°C
0.01
0.1
1
10
1
10
100
1000
0.01
0.1
1
10
ILD (A)
VISX (mV)
ILD (A)
CURRENT GAIN ERROR vs. ILD
CURRENT GAIN ERROR vs. ILD
TOTAL GAIN ERROR vs. ILD
toc18C
toc18D
toc19A
3
2
1
0
3
2
1
0
3
2
1
0
VDD = 2.5V
VDD = 3.6V
VDD = 5.5V
RISX = 160Ω
VDD = 2.5V
VDD = 2.5C
VDD = 3.6V
VDD = 5.5V
RISX = 160Ω
RISX = 160Ω
VDD = 3.6V
VDD = 5.5V
TA = -40°C
TA = +85°C
TA = +125°C
0.01
0.1
1
10
0.01
0.1
1
10
0.01
0.1
1
10
ILD (A)
ILD (A)
ILD (A)
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MAX40016
4-Decade Current Sense Amplifier
with Integrated Current Sense Element
Typical Operating Characteristics (continued)
V
=3.6V, I =300mA, C =10μF, R
=10kΩ, C
=10pF, R
=160Ω, R
=5.36kΩ, R =160kΩ(pertheMAX40016EVkit).
DD
LD
LD
OUT
OUT
ISH
ISM ISL
Typical values are at T = +25°C, unless otherwise noted. (ISX is any one of the ISL, ISM or ISH pins.)
A
TOTAL GAIN ERROR vs. ILD
TOTAL GAIN ERROR vs. ILD
TOTAL GAIN ERROR vs. ILD
toc19B
toc19C
toc19D
3
3
2
1
0
3
2
1
0
VDD = 2.5V
VDD = 3.6V
VDD = 5.5V
RISX = 160Ω
VDD = 2.5V
VDD = 3.6V
VDD = 5.5V
VDD = 2.5V
RISX = 160Ω
RISX = 160Ω
VDD = 3.6V
VDD = 5.5V
TA = +25°C
TA = +85°C
TA = +125°C
2
1
0
0.01
0.1
1
10
0.01
0.1
1
10
0.01
0.1
1
10
ILD (A)
ILD (A)
ILD (A)
BUFFER OUTPUT VOTLAGE HIGH VARIATION
vs. OUTPUT SOURCE CURRENT AT FULL SCALE
BUFFER OUTPUT VOTLAGE LOW vs. OUTPUT
ISH LOAD TRANSIENT RESPONSE
(ILD = 1A TO 3A)
SINK CURRENT (VISX = 10mV)
(VISX = 1.1V)
toc22
toc20
toc21
10000
1000
YELLOW TA = -40°C
BLUE TA = +25°C
RED TA = +85°C
BLUE TA = -40°C,
GREEN TA = +25°C,
ORANGE TA = +85°C,
RED TA = +125°C
1000
100
10
ILD
BLACK TA = +125°C
1A/div
VISH
500mV/div
100
1
VOUT
0.1
0.01
500mV/div
10
0.001
0.01
0.1
1
10
100
0
10
20
30
20μs/div
SINK CURRENT (mA)
SOURCE CURRENT (mA)
ISL LOAD TRANSIENT RESPONSE
(ILD = 1mA TO 3mA)
ISM LOAD TRANSIENT RESPONSE
(ILD = 30mA TO 100mA)
ISL-TO-ISM RANGE-SWITCH RESPONSE
(ILD = 3mA)
toc23
toc24
toc25
ILD
1mA/div
ILD
100mA/div
SEL1
SEL0
5V/div
VISL
500mV/div
VISM
500mV/div
VISL
500mV/div
VISM
50mV/div
VOUT
VOUT
500mV/div
500mV/div
VOUT
200mV/div
20μs/div
100μs/div
4μs/div
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MAX40016
4-Decade Current Sense Amplifier
with Integrated Current Sense Element
Typical Operating Characteristics (continued)
V
=3.6V, I =300mA, C =10μF, R
=10kΩ, C
=10pF, R
=160Ω, R
=5.36kΩ, R =160kΩ(pertheMAX40016EVkit).
DD
LD
LD
OUT
OUT
ISH
ISM ISL
Typical values are at T = +25°C, unless otherwise noted. (ISX is any one of the ISL, ISM or ISH pins.)
A
ISM-TO-ISL RANGE-SWITCH RESPONSE
(ILD = 3mA)
ISH-TO-ISM RANGE-SWITCH RESPONSE
(ILD = 100mA, SEL1 = VDD)
ISM-TO-ISH RANGE-SWITCH RESPONSE
(ILD = 100mA, SEL1 = VDD)
toc26
toc28
toc27
SEL0
SEL0
5V/div
SEL0
5V/div
SEL1
5V/div
VISH
50mV/div
VISM
500mV/div
VISL
500mV/div
VISM
1V/div
VISM
50mV/div
VISH
50mV/div
VOUT
500mV/div
VOUT
500mV/div
VOUT
500mV/div
2µs/div
400ns/div
10μs/div
ISL DISABLE DELAY
(ILD = 1mA, SEL1 = 0V)
ISL ENABLE DELAY
(ILD = 3mA, SEL1 = 0V)
ISL ENABLE DELAY
(ILD = 1mA, SEL1 = 0V)
toc31
toc30
toc29
SEL0
2V/div
SEL0
2V/div
SEL0
2V/div
VISL
VISL
500mV/div
200mV/div
VISL
200mV/div
VOUT
200mV/div
VOUT
500mV/div
VOUT
200mV/div
100µs/div
40µs/div
10µs/div
ISM ENABLE DELAY
(ILD = 30mA, SEL0 = 0V)
ISL DISABLE DELAY
(ILD = 3mA, SEL1 = 0V)
ISM DISABLE DELAY
(ILD = 30mA, SE0 = 0V)
toc33
toc32
toc34
SEL1
2V/div
SEL0
SEL1
2V/div
2V/div
VISM
200mV/div
VISL
VISL
500mV/div
200mV/div
VOUT
200mV/div
VOUT
500mV/div
VOUT
200mV/div
10µs/div
2µs/div
10µs/div
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MAX40016
4-Decade Current Sense Amplifier
with Integrated Current Sense Element
Typical Operating Characteristics (continued)
V
=3.6V, I =300mA, C =10μF, R
=10kΩ, C
=10pF, R
=160Ω, R
=5.36kΩ, R =160kΩ(pertheMAX40016EVkit).
DD
LD
LD
OUT
OUT
ISH
ISM ISL
Typical values are at T = +25°C, unless otherwise noted. (ISX is any one of the ISL, ISM or ISH pins.)
A
ISM ENABLE DELAY
(ILD = 100mA, SEL0 = 0V)
ISM DISABLE DELAY
(ILD = 100mA, SE0 = 0V)
toc35
toc36
SEL1
2V/div
SEL1
2V/div
VISM
500mV/div
VISM
500mV/div
VOUT
500mV/div
VOUT
500mV/div
2µs/div
4µs/div
ISH ENABLE DELAY
(ILD = 300mA)
ISH DISABLE DELAY
(ILD = 300mA)
toc37
toc38
SEL0 = SEL1
2V/div
SEL0 = SEL1
2V/div
VISH
50mV/div
VISH
50mV/div
VOUT
VOUT
50mV/div
100mV/div
2µs/div
20µs/div
ISH DISABLE DELAY
(ILD = 3A)
ISH ENABLE DELAY
(ILD = 3A)
toc40
toc39
SEL0 = SEL1
2V/div
SEL0 = SEL1
2V/div
VISH
500mV/div
VISH
500mV/div
VOUT
VOUT
500mV/div
500mV/div
2µs/div
4µs/div
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MAX40016
4-Decade Current Sense Amplifier
with Integrated Current Sense Element
Typical Operating Characteristics (continued)
V
=3.6V, I =300mA, C =10μF, R
=10kΩ, C
=10pF, R
=160Ω, R
=5.36kΩ, R =160kΩ(pertheMAX40016EVkit).
DD
LD
LD
OUT
OUT
ISH
ISM ISL
Typical values are at T = +25°C, unless otherwise noted. (ISX is any one of the ISL, ISM or ISH pins.)
A
POWER-DOWN TIME
(ILD = 300mA, ISH SELECTED)
POWER-UP TIME
(ILD = 300mA, ISH SELECTED)
ISX SMALL SIGNAL BANDWIDTH
toc42
toc43
toc41
4
2
VDD
2V/div
VDD
2V/div
0
-2
-4
VISH
50mV/div
VISH
50mV/div
-6
-8
-10
-12
-14
-16
ILD = 3mADC 300μAP-P
NORMALIZED TO 2mA/A
NO CLD at LD PIN
VOUT
100mV/div
VOUT
100mV/div
0.01
1
100
10000
Thousands
100µs/div
100µs/div
FREQUENCY (kHz)
BUFFER SMALL SIGNAL BANDWIDTH
ISX SMALL SIGNAL BANDWIDTH
ISX SMALL SIGNAL BANDWIDTH
toc46
toc44
toc45
10
5
2
0
2
0
VOUT = 150mVP-P
ROUT = 10kΩ
-2
-2
0
-4
-4
-6
-6
-5
-8
-8
-10
-15
-20
-10
-12
-14
-16
-10
-12
ILD = 300mADC 3mAP-P
ILD = 30mADC 3mAP-P
NORMALIZED TO 2mA/A
NO CLD at LD PIN
-14 NORMALIZED TO 2mA/A
NO CLD at LD PIN
-16
0.01 0.1
1
10
100 1000 10000 100000
0.01
1
100
10000
Thousands
0.01
1
100
10000
Thousands
Thousands
FREQUENCY (kHz)
FREQUENCY (kHz)
FREQUENCY (kHz)
TOTAL OUTPUT VOLTAGE NOISE DENSITY vs.
0.1 TO 10 Hz PEAK TO PEAK
TOTAL OUTPUT NOISE
BUFFER LARGE SIGNAL BANDWIDTH
FREQUENCY
toc49
toc47
toc48
2000
1800
1600
1400
1200
1000
800
10
5
20
15
10
5
VOUT = 1VP-P
ROUT = 10kΩ
MEASURED AT VOUT
ILD = 300mA
0
-5
0
-5
-10
-15
-20
600
-10
-15
-20
400
200
MEASURED AT VOUT
ILD = 300mA
0
0.001
0.01
0.1
1
10
100
0.01 0.1
1
10
100 1000 10000 100000
2s/div
Thousands
FREQUENCY (kHz)
FREQUENCY (kHz)
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MAX40016
4-Decade Current Sense Amplifier
with Integrated Current Sense Element
Pin Configuration
TOP VIEW
(BUMP SIDE DOWN)
TOP VIEW
1
2
3
4
5
12
11
10
9
+
SEL1
LD
ISM
ISL
VDD
13
14
15
16
8
7
6
5
ISM
LD
A
B
GND
N.C.
LD
MAX40016
VDD
VDD
SEL0
VDD
LD
GNDS
GND
VOUT
ISH
LD
VDD
VDD
+
C
LD
1
2
3
4
WLP
TQFN
4mm x 4mm
Pin Description
PIN
NAME
FUNCTION
Supply and Measured Current Input. Bypass V
WLP
TQFN
C1, A2,
B2, C2
Device V
to GND with a 0.1μF and a
DD
DD
1, 4, 5, 16
V
DD
10μF ceramic capacitors in parallel as close to the device as possible.
Measured Current Output. Connect LD to the load side. Bypass LD to GND with a 10µF
ceramic capacitor.
A3, B3, C3
6, 7, 15
LD
C5
A4
A5
B4
C4
B1
A1
11
8
ISH*
ISM*
ISL*
High Current Range Output. Connect a resistor from ISH to GND to scale the V
range.
OUT
Middle Current Range Output. Connect a resistor from ISM to GND to scale the V
range.
OUT
9
Low Current Range Output. Connect a resistor from ISL to GND to scale the V
range.
OUT
12
13
2
GNDS
GND
SEL0
SEL1
Ground. Return of the output amplifier's gain setting network. Connect GNDS to GND.
Circuit Ground. All signals are referenced to GND.
Logic Selection Input 0 (see Table 1).
3
Logic Selection Input 1 (see Table 1).
Amplifier Output Voltage. V
depends on the resistor values on the ISL, ISM, and ISH inputs.
is proportional to the VDD to ILD current. The scaling factor
OUT
B5
—
—
10
14
EP
V
OUT
N.C.
EP
No Connect. Internally not connected.
Exposed Pad. Internally connected to GND. Connect to a large ground plane to maximize
thermal performance. Do not use EP as the only ground connection.
*ISL, ISM, and ISH are electrically identical and named to differentiate among the three selectable outputs. Each output when selected
is able to support the full-scale sense current range.
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MAX40016
4-Decade Current Sense Amplifier
with Integrated Current Sense Element
The three multiplexed scaling current outputs from
MAX40016 allow the span to be divided into three ranges
that are well within a lower-resolution ADC’s capability.
Note that it is the same current that is switched to one
of the three outputs at a time. The ISH, ISM and ISL pin
names are mainly to indicate which output pin is selected.
The MAX40016 has its ranges selected using the SEL0
and SEL1 pins. See Current Sense Range Selection
(SEL0, SEL1) section and (Table 1) for all the modes.
Detailed Description
The MAX40016 CSA contains an integrated current-
sensing element saving the space and cost of an external
sense resistor. Having an integrated sense element has
the extra advantage that the entire current measuring
path can be factory trimmed, saving the user from having
to calibrate independent sense resistors and CSAs.
The CSA has a low power mode in which the current-
sensing element remains on, but the output and internal
circuitry are turned off to bring the total supply current well
below 10μA. In this mode, the pass element is turned fully
on and will therefore drop slightly less voltage than while
it is measuring current. Low power mode is selected by
applying a logic-low to both SEL0 and SEL1 (see Table 1).
Scaling Resistors
The multiplexed scaling resistors' values (R , R
,
ISH
ISM
R ) should be chosen to suit the ADC’s full-scale, usually
ISL
defined by its reference voltage (V
). Care should be
REF
taken to account for all tolerances to avoid overloading
the ADC. The typical current from the MAX40016’s ISL, or
ISM, or ISH pin is specified as 2mA/A. The internal ampli-
fier has a gain of 1.5V/V. Resistors of 0.1% are readily
available and so the nominal resistance value is given by:
Three multiplexed scaling outputs from the wide range
CSA allow the use of different scaling resistors so that
a 12-bit ADC can be sufficient with simple resistor range
selection. If only one output is used, an ADC with at least
15 bits of resolution will be needed to realize the full
dynamic range of the CSA. See the applications section
for details. Each of the scaled outputs are available as a
VREF 1.5
/
R
=
(Ω)
ISX
I
× 0.002
(
)
FS
voltage from the V
pin.
OUT
The R
determined from the above equation, where the
ISX
The V
amplifier output is capable of driving a wide
OUT
voltage across the scaling resistor should be limited to 1V,
which corresponds to 1.5V full-scale after the amplifier.
The closest E192 available value is 167Ω which gives
range of ADCs and has a gain of 1.5V/V to provide a full-
scale of 1.5V. Most of the values shown in this document
are for a full-scale output of 1.5V, suited for 1.8V controllers
with embedded 10 to 16-bit ADCs.
very little over-current margin. A 160Ω R
value offers a
ISX
little more margin towards a conservative design.
The MAX40016 senses from less than 300µA to greater
than 3A current range. The output maintains less than 5%
error specification over a 10,000:1 ratio. In theory, this
requires an ADC with a resolution exceeding 13 bits to
realize its full dynamic range. While such ADCs are read-
ily available, the system microcontroller already has an
embedded 12-bit ADC in many cases.
Current Sense Range Selection (SEL0, SEL1)
SEL0 and SEL1 are digital inputs decoded to control the
mirroring of the sense current on the V
to LD path to
DD
one of three scaled current outputs (ISH, ISM, or ISL), as
shown in Table 1. When both SEL0 and SEL1 are at logic
0, the MAX40016 enters its low power operating mode.
Table 1. Current Sense Range Selection
SEL0
SEL1
OPERATING MODE/RANGE
Low Power Mode is Enabled. V
still passes current just as an external sense resistor would. There is no capability to turn off the current.
is high impedance. In low power mode, the current-sensing element
OUT
0
0
Middle Current Sense Range (ISM) is Enabled. The resistor R
nal defines the full-scale voltage of 1V to the internal amplifier.
connected at this current output termi-
ISM
0
1
1
1
0
1
Low Current Sense Range (ISL) is Enabled. The resistor R
connected at this current output terminal
ISL
defines the full-scale voltage of 1V to the internal amplifier.
High Current Sense Range (ISH) is Enabled. The resistor R
connected at this current output terminal
ISH
defines the full-scale voltage of 1V to the internal amplifier.
Note: ISL, ISM, ISH can support all current range from low end to high end. The only difference is that they are selected by different
SEL0/SEL1 combination.
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MAX40016
4-Decade Current Sense Amplifier
with Integrated Current Sense Element
current input terminal. Pay extra attention to bypassing
and grounding the MAX40016. Peak supply and measured
output currents may exceed 3A when the load side experiences
large current transients with large external capacitive
loads. Supply drops and ground shifts may degrade the
device performance. Ground shifts due to insufficient
device grounding may also disturb other circuits sharing
the same AC ground return path. Any series inductance in
Low Power Mode
The MAX40016 has a low power mode that is activated
by pulling both SEL0 and SEL1 low. In this mode, all of
the internal circuitry is shut down to save power. The output
amplifier is placed in a high impedance state to allow
multiplexing of the output line with another MAX40016
for example. In low power mode, the current-sensing
element still passes current just as an external sense
resistor would. There is no capability to turn off the current.
the V , LD and/or GND paths can cause oscillations due
DD
to the very high di/dt when switching the MAX40016 with
ISX Residual Current
any capacitive load. Bypass V
supply to ground with a
DD
0.1µF in parallel with a 10µF ceramic capacitors as close
as possible to the device. Bypass the measured current
output, LD terminal, with a 10µF ceramic capacitor or
larger depending on the sensing load current, additional
bypassing may be needed to keep the device stable
during large load output transitions.
When at no load current (I = 0), there is a small inter-
LD
nal residual current at ISX pin due to the internal current
mirror block mechanism. This residual current is not an
offset current and should not have effect when there is
a load current being sensed. Refer to Typical Operating
Characteristics for the typical information of this residual
current over the the temperature range and V
voltage range.
supply
DD
Layout Guidelines
Due to the high currents that may flow through the
integrated sensing element based on the application, take
care to eliminate solder and parasitic trace resistance
from causing errors. Using thicker copper in the PCB
construction for these high currents is recommended. Use
of Kelvin (force and sense) PCB layout techniques or use
of a multilayer PCB with separate ground, power supply
and load planes is recommended for noisy digital environ-
ments (see the MAX40016EVKIT# data sheet for a layout
example). Keep digital signals far away from the sensitive
analog inputs. Unshielded long traces at the input and
output sense terminals of the device can degrade perfor-
mance due to noise pick-up.
Device Power Up
Initially, the MAX40016 powers up in low power mode,
regardless of the state of SEL0 and SEL1. After the
power-up delay time (100µs), the part reverts to the mode
selected by SEL0 and SEL1.
Applications Information
ESD Clamps
The diagram shows the internal ESD clamping diodes that
protect the MAX40016 against electrostatic discharge.
Power Supplies and Bypassing
The MAX40016 operates from single supply voltage +2.5V
to +5.5V. The V
supply input is also the measured
DD
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MAX40016
4-Decade Current Sense Amplifier
with Integrated Current Sense Element
Application Information
LD
VDD
ISH
ISM
CURRENT
MIRROR
CONTROL
ISL
SEL0
SEL1
RANGE
SELECTION
VOUT
GND
GNDS
Figure 1. Functional Diagram Showing ESD Clamps
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MAX40016
4-Decade Current Sense Amplifier
with Integrated Current Sense Element
Thus, I
= I /F , giving R
= F /I
.
RSH
FS DV
ISH
DV FS
Typical Application Circuits
When the chosen ADC has sufficient resolution to handle
Example #1: Using a MAX11214 (24-bit at 64ksps).
the MAX40016 full dynamic range (4-decade of sensing
The high sampling rate of the MAX11214 renders an
range), only the R
resistor is required (Figure 2). For
ISH
anti-aliasing filter unnecessary. Only the R
resistor is
ISH
a full-scale of 3A the value of R
is 160Ω for a 1V full-
ISH
needed to define the gain and the internal programmable
gain amplifier inside the ADC allows the selection of
reference voltages to match with the 1.5V full-scale from
MAX40016. Alternatively, the MAX40016’s output buffer
can be bypassed and the ADC can be connected directly
scale at the ISH pin, which corresponds to 1.5V output at
V
OUT
.
Determining the nominal value of R
:
ISH
The amplifier has a nominal gain of 1.5V/V and the output
full-scale voltage is optimized to be 1.5V. So the full-scale
to the ISH pin, to read the voltage across R
directly
ISH
(see Figure 3). If the PCB layout requires a long distance
between the MAX40016 and the ADC, the current output
voltage across R
is 1V.
ISH
The current division factor F
ISH) is 500 (i.e., 2mA/A).
(from sensing channel to
DV
from ISH should be run across the PCB and the R
ISH
terminating resistor placed as close as possible to the
ADC’s input. This helps reduce errors caused by voltage
drops across the PCB.
The full-scale sensed current (I ) is divided by F
and
DV
FS
the divided current flows through R
.
ISH
Figure 2. Using the MAX40016 with MAX11214 24-Bit, 64ksps ADC (Single Scaling Resistor with Internal Buffer)
Figure 3. Using the MAX40016 with MAX11214 24-Bit, 64ksps ADC (Single Scaling Resistor without Internal Buffer)
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MAX40016
4-Decade Current Sense Amplifier
with Integrated Current Sense Element
In the idle state, the ADC’s input impedance is high. When
the ADC begins its acquisition phase the input impedance
Implementation with Lower Resolution ADCs
When two or three ranges are required, as in the case of
becomes C in series with R . The amplifier is thus pre-
IN
IN
a 10-bit to 12-bit ADC, the higher range resistor (R
)
ISH
sented with a transient change in load impedance. Adding
is calculated as described above. Calculating R
and
ISM
an RC network (R and C ), as shown in Figure 4, serves
F
F
or R
follows the same method with the only difference
ISL
to reduce the load transient seen by the amplifier.
being the full-scale current is now the lower-range full-
scale current. Exactly where it is optimum to arrange this
current will depend on the system. Typically splitting the
ranges in the region of 30:1 is suitable for most applications.
Begin by selecting the value of C which serves as a
F
“charge reservoir” for the ADC’s input stage. When the
ADC begins its acquisition phase, C should be able
F
Using R
= 160Ω, R
= 5.3kΩ, and R
= 160kΩ to
to provide the charge required by the internal sampling
ISH
ISM
ISL
split the range up equally (Figure 4). However, this range
transition value can be chosen such that the most
commonly expected readings would have the better
resolution. Selecting too low a transition point leads to
more, presumably unnecessary, quantization noise in the
higher range.
capacitor (C ) without excessive droop. A sufficiently
IN
large C therefore reduces the load transient seen by the
F
amplifier. It is generally appropriate to target between 2%
and 5% droop at ADC input. This then results in a value
of C that is between 20 and 50 times the value of C .
F
IN
For the capacitor type use a C0G (or NP0) ceramic chip
capacitor and place it between ADC input and the ground
plane, as close as possible to the ADC. In this example,
Example #2: Using an Embedded 12-bit ADC
The following example uses a typical moderate-speed
SAR ADC with a 25pF sampling capacitor (CIN) and
with C = 25pF, the external capacitance value should
IN
be between 500pF and 1,250pF and a good choice is a
1.2nF C0G capacitor.
1.5us acquisition time (T
).
ACQ
Figure 4. Using the MAX40016 with an Embedded 12-Bit ADC
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MAX40016
4-Decade Current Sense Amplifier
with Integrated Current Sense Element
The next step is to choose the value of R . Two charac-
F
the external RC network is to be less than 0.5LSB. This
teristics of the ADC should be considered when calculat-
results in a value of 139Ω or less for R .
F
ing R : the acquisition time of converter (T
) and the
F
ACQ
Finally, to ensure stability, the cutoff frequency of the
ADC sampling capacitance (C ). In addition, the RC
IN
R -C low-pass filter should be smaller than the gain-
F
F
network will require several time constants to settle once
the sampling switch is closed. If the ADC’s resolution is
12 bits, and the input needs to settle to less than 0.5LSB,
then 9 time constants will be required. Because settling
bandwidth product of the amplifier. Choosing 130Ω
and 1.2nF yields about 1MHz which is smaller than the
1.5MHz gain-bandwidth product of the amplifier. Note
that Voltage at ISH, ISM, ISL pins should not exceed
1.1V for proper operation (see Input Voltage Range Under
Amplifier section of the Electrical Characteristics table).
must occur during the acquisition period, R * C * 9 must
F
F
be less than or equal to T
if the error introduced by
ACQ
Ordering Information
PIN-
TOP
PART
TEMP RANGE
PACKAGE MARK
MAX40016ANL+T -40°C to +125°C
MAX40016ATE+T -40°C to +125°C
15 WLP
+AAB
—
16 TQFN
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Denotes tape-and-reel.
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MAX40016
4-Decade Current Sense Amplifier
with Integrated Current Sense Element
Revision History
REVISION REVISION
PAGES
CHANGED
DESCRIPTION
NUMBER
DATE
0
1/18
Initial release
—
Updated Benefits and Features, Absolute Maximum Ratings, Package Information,
Electrical Characteristics, Typical Operating Characteristics, Pin Description, and
Ordering Information
1, 3–5, 7–15,
22
1
2
8/18
Updated General Description, Benefits and Features, data sheet title, Simplified Block
Diagram, Typical Operating Characteristics global conditions and graphs, and Typical
Application Circuits
11/18
1, 2, 7, 14, 21
For pricing, delivery, and ordering information, please visit Maxim Integrated’s online storefront at https://www.maximintegrated.com/en/storefront/storefront.html.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
©
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
2018 Maxim Integrated Products, Inc.
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