LTC4210 [ADI]
No RSENSE⢠Electronic Circuit Breaker;
| 型号： | LTC4210 |
| 厂家： | 
ADI |
| 描述： | No RSENSE⢠Electronic Circuit Breaker |
| 文件： | 总22页 (文件大小：650K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LTC4213
No R
™
SENSE
Electronic Circuit Breaker
FEATURES
DESCRIPTION
The LTC®4213 is an electronic circuit breaker. An overcur-
rent circuit breaker senses the voltage across the drain
and source terminals of an external N-channel MOSFET
with no need for a sense resistor. The advantages are a
lower cost and reduced voltage and power loss in the
switch path. An internal high-side driver controls the
external MOSFET gate.
n
Fast 1µs Response Circuit Breaker
n
3 Selectable Circuit Breaker Thresholds
n
No Sense Resistor Required
n
Dual Level Overcurrent Fault Protection
n
Controls Load Voltages from 0V to 6V
n
High-Side Drive for External N-Channel MOSFET
n
Undervoltage Lockout
n
READY Pin Signals When Circuit Breaker Armed
Two integrated comparators provide dual level overcurrent
protection over the bias supply to ground common mode
range. The slow comparator has 16µs response while the
fast comparator trips in 1µs. The circuit breaker has three
selectable trip thresholds: 25mV, 50mV and 100mV. An
ON pin controls the ON/OFF and resets circuit breaker
faults. READY signals the MOSFET is conducting and
the circuit breaker is armed. The LTC4213 operates from
n
Small Plastic (3mm × 2mm) DFN and TSOT-23
(ThinSOT™) Packages
APPLICATIONS
n
Electronic Circuit Breaker
n
High-Side Switch
V
= 2.3V to 6V.
n
Hot Board Insertion
CC
All registered trademarks and trademarks are the property of their respective owners.
TYPICAL APPLICATION
Severe Overload Response
1.25V Electronic Circuit Breaker
SI4864DY
I
OUT
(50A/DIV)
V
V
IN
OUT
1.25V
1.25V
3.5A
V
OUT
SENSEP GATE SENSEN
V
BIAS
(1V/DIV)
V
CC
V
BIAS
2.3V TO 6V
LTC4213
READY
10k
V
GATE
(5V/DIV)
OFF ON
ON
GND
I
SEL
V
IN
(1V/DIV)
4213 TA01a
4213 TA01b
2μs/DIV
Rev. A
1
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LTC4213
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Bias Supply Voltage (V )............................ –0.3V to 9V
Operating Temperature Range
CC
Input Voltages
LTC4213C ................................................ 0°C to 70°C
LTC4213I .............................................–40°C to 85°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10sec)....................300°C
ON, SENSEP, SENSEN.............................. –0.3V to 9V
I
...........................................–0.3V to (V + 0.3V)
SEL
CC
Output Voltages
GATE...................................................... –0.3V to 15V
READY..................................................... –0.3V to 9V
PIN CONFIGURATION
TOP VIEW
TOP VIEW
READY
ON
1
2
3
4
8
7
6
5
V
CC
GND 1
8 GATE
SENSEP
SENSEN
GATE
I
SENSEN
2
3
4
7
6
5
SEL
ON
9
I
SEL
SENSEP
GND
READY
V
CC
TS8 PACKAGE
8-LEAD PLASTIC TSOT-23
DDB PACKAGE
8-LEAD (3mm × 2mm) PLASTIC DFN
T
= 125°C, θ = 195°C/W
JA
JMAX
T
= 125°C, θ = 250°C/W
JA
JMAX
EXPOSED PAD (PIN 9) PCB CONNECTION OPTIONAL
ORDER INFORMATION
TAPE AND REEL
TAPE AND REEL (MINI)
PART MARKING*
LBHV
PACKAGE DESCRIPTION
TEMPERATURE RANGE
0°C to 70°C
LTC4213CDDB#TRPBF
LTC4213IDDB#TRPBF
LTC4213CTS8#TRPBF
LTC4213ITS8#TRPBF
N/A
N/A
8-Lead (3mm × 2mm) Plastic DFN
8-Lead (3mm × 2mm) Plastic DFN
8-Lead Plastic TSOT-23
LBHV
–40°C to 85°C
0°C to 70°C
LTC4213CTS8#TRMPBF LTHQB
LTC4213ITS8#TRMPBF LTHQB
8-Lead Plastic TSOT-23
–40°C to 85°C
Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 5V, ISEL = 0 unless otherwise noted. (Note 2)
SYMBOL
PARAMETER
CONDITIONS
MIN
2.3
0
TYP
MAX
6
UNITS
V
l
l
l
l
l
V
V
Bias Supply Voltage
SENSEP Voltage
CC
6
V
SENSEP
I
CC
V
CC
V
CC
V
CC
Supply Current
1.6
2.07
100
40
3
mA
V
V
Undervoltage Lockout Release
Undervoltage Lockout Hysteresis
V
Rising
CC
1.8
30
15
2.23
160
80
15
CC(UVLR)
∆V
CC(UVHYST)
mV
µA
I
SENSEP Input Current
V
V
= V
= V
= 5V, Normal Mode
= 0, Normal Mode
SENSEP
SENSEP
SENSEN
–1
µA
SENSEP
SENSEN
Rev. A
2
For more information www.analog.com
LTC4213
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 5V, ISEL = 0 unless otherwise noted. (Note 2)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
40
MAX
80
UNITS
µA
I
SENSEN Input Current
V
V
V
= V
= V
= V
= 5V, Normal Mode
= 0, Normal Mode
= 5V, Reset Mode or
15
SENSEN
SENSEP
SENSEP
SENSEP
SENSEN
SENSEN
SENSEN
–1
15
µA
50
280
µA
Fault Mode
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
V
V
Circuit Breaker Trip Voltage
I
I
I
I
I
I
= 0, V
= V
22.5
45
25
50
27.5
55
mV
mV
mV
mV
mV
mV
µA
mA
V
CB
SEL
SEL
SEL
SEL
SEL
SEL
SENSEP
CC
V
= V
– V
CB
SENSEP SENSEN
= Floated, V
= V
SENSEP
CC
= V , V
= V
90
100
100
175
325
–100
40
110
115
200
371
–150
CC SENSEP
CC
Fast Circuit Breaker Trip Voltage
= V – V
= 0, V
= V
63
CB(FAST)
SENSEP
CC
V
CB(FAST)
SENSEP
SENSEN
= Floated, V
= V
126
252
–50
10
SENSEP
CC
= V , V
= V
CC SENSEP
CC
I
I
GATE Pin Pull Up Current
V
= 0V
GATE
GATE(UP)
GATE Pin Pull Down Current
External N-Channel Gate Drive
∆V
– V
= 200mV, V
= 8V
GATE
GATE(DN)
SENSEP
SENSEN
∆V
∆V
∆V
V
V
V
V
V
V
= 0, V ≥ 2.97V, I = –1µA
GATE
4.8
2.65
4.4
2.5
0.3
0.15
6.5
4.3
5.4
3.5
1.1
0.8
0.2
0
8
8
GSMAX
GSARM
GSMAX
SENSEN
SENSEN
SENSEN
SENSEN
SENSEN
SENSEN
CC
= 0, V = 2.3V, I
= –1µA
V
CC
GATE
V
Voltage to Arm Circuit Breaker
= 0, V ≥ 2.97V
7.6
7
V
GS
CC
= 0, V = 2.3V
V
CC
– ∆V
Difference Between ∆V
and ∆V
= 0, V ≥ 2.97V
V
GSARM
GSMAX
GSARM
CC
= 0, V = 2.3V
V
CC
V
READY Pin Output Low Voltage
READY Pin Leakage Current
ON Pin High Threshold
ON Pin Hysteresis
I
= 1.6mA, Pull-Down Device On
= 5V, Pull-Down Device Off
READY
0.4
1
V
READY(OL)
READY
I
V
µA
V
READY(LEAK)
V
ON Rising, GATE Pulls Up
0.76
10
0.8
40
0.84
90
ON(TH)
∆V
ON Falling, GATE Pulls Down
ON Falling, Fault Reset, GATE Pull-Down
mV
V
ON(HYST)
ON(RST)
ON(IN)
l
l
l
V
ON Pin Reset Threshold
ON Pin Input Current
0.36
0.4
0
0.44
1
I
V
= 1.2V
µA
V
ON
∆V
Overvoltage Threshold, ∆V = V
– V
CC
0.41
25
7
0.7
65
1.1
160
27
OV
OV
SENSEP
t
t
Overvoltage Protection Trip Time
V
= V = Step 5V to 6.2V
SENSEN
µs
µs
OV
SENSEP
l
l
V
Trips to GATE Discharging
∆V
Step 0mV to 50mV, V
SENSEN
16
FAULT(SLOW)
FAULT(FAST)
DEBOUNCE
READY
CB
SENSE
Falling, V = V
= 5V
CC
SENSEP
t
t
t
t
t
t
V
Trips to GATE Discharging
∆V
V
Step 0V to 0.3V, V
= 5V
Falling,
SENSEN
1
60
50
5
2.5
130
115
10
µs
µs
µs
µs
µs
µs
CB(FAST)
SENSE
SENSEP
Startup De-Bounce Time
READY Delay Time
Turn-Off Time
V
= 0V to 2V Step to Gate Rising
27
22
1.5
4
ON
(Exiting Reset Mode)
V
V
= 0V to 8V Step to READY Rising,
SENSEP
GATE
= V
= 0
SENSEN
V
= 2V to 0.6V Step to GATE
ON
OFF
Discharging
Turn-On Time
V
= 0.6V to 2V Step to GATE Rising
ON
8
16
ON
(Normal Mode)
Reset Time
V
Step 2V to 0V
20
80
150
RESET
ON
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: All currents into device pins are positive; all currents out of device
pins are negative. All voltages are referenced to ground unless otherwise
specified.
Rev. A
3
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LTC4213
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C. VCC = 5V unless otherwise noted.
ICC vs VCC
ICC vs Temperature
VCC(UVLR) vs Temperature
3.0
2.5
2.0
1.5
1.0
0.5
0
3.0
2.5
2.0
1.5
1.0
0.5
0
2.3
2.2
2.1
2.0
1.9
1.8
1.7
V
CC
RISING
V
FALLING
CC
4.5 5.0
75 100
TEMPERATURE (°C)
75 100
TEMPERATURE (°C)
2.0 2.5 3.0 3.5 4.0
5.5 6.0
–50 –25
0
25
50
125
–50 –25
0
25
50
125
BIAS SUPPLY VOLTAGE (V)
4213 G01
4213 G02
4213 G03
Normalized VCB vs VCC
Normalized VCB vs Temperature
Normalized VCB(FAST) vs VCC
1.06
1.04
1.02
1.00
0.98
0.96
0.94
1.06
1.04
1.02
1.00
0.98
0.96
0.94
1.06
1.04
1.02
1.00
0.98
0.96
0.94
4.5 5.0
75 100
TEMPERATURE (°C)
4.5 5.0
2.0 2.5 3.0 3.5 4.0
5.5 6.0
–50 –25
0
25
50
125
2.0 2.5 3.0 3.5 4.0
5.5 6.0
BIAS SUPPLY VOLTAGE (V)
BIAS SUPPLY VOLTAGE (V)
4213 G04
4213 G05
4213 G06
Normalized VCB(FAST) vs
Temperature
IGATE(UP) vs VCC
IGATE(UP) vs Temperature
1.06
1.04
1.02
1.00
0.98
0.96
0.94
104
102
100
98
104
102
100
98
96
96
75 100
TEMPERATURE (°C)
4.5 5.0
2.0 2.5 3.0 3.5 4.0
BIAS SUPPLY VOLTAGE (V)
75 100
TEMPERATURE (°C)
–50 –25
0
25
50
125
5.5 6.0
–50 –25
0
25
50
125
4213 G07
4213 G08
4213 G09
Rev. A
4
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LTC4213
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C. VCC = 5V unless otherwise noted.
∆VGSMAX and ∆VGSARM vs
Temperature
∆VGSMAX and ∆VGSARM vs VCC
VON(TH) vs VCC
8
7
6
5
4
3
8
7
6
5
4
3
0.90
0.85
0.80
0.75
0.70
0.65
∆V
GSMAX
(FOR 5V
)
CC
∆V
GSMAX
GSARM
∆V
GSARM
(FOR 5V
)
CC
HIGH THRESHOLD
LOW THRESHOLD
∆V
∆V
∆V
(FOR 2.5V
(FOR 2.5V
)
GSMAX
CC
)
GSARM
CC
4.5 5.0
75 100
TEMPERATURE (°C)
4.5 5.0
2.0 2.5 3.0 3.5 4.0
BIAS SUPPLY VOLTAGE (V)
2.0 2.5 3.0 3.5 4.0
5.5 6.0
–50 –25
0
25
50
125
5.5 6.0
BIAS SUPPLY VOLTAGE (V)
4213 G10
4213 G11
4213 G12
VON(TH) vs Temperature
∆VOV vs VCC
∆VOV vs Temperature
0.90
0.85
0.80
0.75
0.70
0.65
0.74
0.72
0.70
0.68
0.66
1.0
0.9
0.8
0.7
0.6
0.5
0.4
HIGH THRESHOLD
LOW THRESHOLD
75 100
TEMPERATURE (°C)
4.5 5.0
75 100
TEMPERATURE (°C)
–50 –25
0
25
50
125
2.0 2.5 3.0 3.5 4.0
5.5 6.0
–50 –25
0
25
50
125
BIAS SUPPLY VOLTAGE (V)
4213 G13
4213 G14
4213 G15
tDEBOUNCE and tREADY vs
Temperature
tDEBOUNCE and tREADY vs VCC
tRESET vs VCC
100
80
60
40
20
0
100
80
60
40
20
0
120
100
80
60
40
20
0
t
DEBOUNCE
t
DEBOUNCE
t
READY
t
READY
4.5 5.0
75 100
TEMPERATURE (°C)
4.5 5.0
2.0 2.5 3.0 3.5 4.0
BIAS SUPPLY VOLTAGE (V)
2.0 2.5 3.0 3.5 4.0
5.5 6.0
–50 –25
0
25
50
125
5.5 6.0
4213 G18
BIAS SUPPLY VOLTAGE (V)
4213 G16
4213 G17
Rev. A
5
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LTC4213
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C. VCC = 5V unless otherwise noted.
tRESET vs Temperature
tFAULT(SLOW) vs VCC
tFAULT(SLOW) vs Temperature
22
20
18
16
14
12
10
22
20
18
16
14
12
10
100
90
80
70
60
4.5 5.0
2.0 2.5 3.0 3.5 4.0
BIAS SUPPLY VOLTAGE (V)
75 100
TEMPERATURE (°C)
75 100
TEMPERATURE (°C)
5.5 6.0
–50 –25
0
25
50
125
–50 –25
0
25
50
125
4213 G20
4213 G21
4213 G19
t
FAULT(FAST) vs VCC
tFAULT(FAST) vs Temperature
1.3
1.2
1.1
1.0
0.9
0.8
0.7
1.3
1.2
1.1
1.0
0.9
0.8
0.7
4.5 5.0
BIAS SUPPLY VOLTAGE (V)
75 100
TEMPERATURE (°C)
2.0 2.5 3.0 3.5 4.0
5.5 6.0
–50 –25
0
25
50
125
4213 G22
4213 G23
Rev. A
6
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LTC4213
PIN FUNCTIONS (DFN/TSOT-23)
Exposed Pad (Pin 9, DDB Package Only): Exposed pad
may be left open or connected to device ground.
READY (Pin 1/Pin 4): READY Status Output. Open-drain
output that goes high impedance when the external
MOSFET is on and the circuit breaker is armed. Otherwise
this pin pulls low.
GATE (Pin 5/Pin 8): GATE Drive Output. An internal charge
pump supplies 100µA pull-up current to the gate of the
external N-channel MOSFET. Internal circuitry limits the
voltage between the GATE and SENSEN pins to a safe gate
drive voltage of less than 8V. When the circuit breaker
trips, the GATE pin abruptly pulls to GND.
SENSEN (Pin 6/Pin 7): Circuit Breaker Negative Sense
Input. Connect this pin to the source of the external
MOSFET. During reset or fault mode, the SENSEN pin
discharges the output to ground with 280µA.
GND (Pin 4/Pin 1): Device Ground.
SENSEP (Pin 7/Pin 6): Circuit Breaker Positive Sense
Input. Connect this pin to the drain of external N-channel
MOSFET. The circuit breaker trips when the voltage across
ISEL (Pin 3/Pin 2): Threshold Select Input. With the
I
pin grounded, float or tied to V the V is set to
SEL
CC CB
SENSEP and SENSEN exceeds V . The input common
CB
25mV, 50mV or 100mV, respectively. The corresponding
values are 100mV, 175mV and 325mV.
mode range of the circuit breaker is from ground to V
+
CC
V
CB(FAST)
0.2V when V < 2.5V. For V ≥ 2.5V, the input common
mode range CisCfrom groundCtoC V + 0.4V.
ON (Pin 2/Pin 3): ON Control Input. The LTC4213 is in
reset mode when the ON pin is below 0.4V. When the ON
pin increases above 0.8V, the device starts up and the
GATE pulls up with a 100µA current source. When the
ON pin drops below 0.76V, the GATE pulls down. To reset
a circuit breaker fault, the ON pin must go below 0.4V.
CC
VCC (Pin 8/Pin 5): Bias Supply Voltage Input. Normal
operation is between 2.3V and 6V. An internal under-volt-
age lockout circuit disables the device when V < 2.07V.
CC
Rev. A
7
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LTC4213
BLOCK DIAGRAM
SENSEP
SENSEN
V
CC
I
V
V
CB(FAST)
SEL
CB
0.7V
V
V
CB(FAST)
CB
+
+
+
100mV 325mV
50mV
25mV
V
CC
–
–
–
175mV
100mV
+
–
+
–
+
–
V
CC
SLOWCOMP
FASTCOMP
OVCOMP
CHARGE
PUMP
280µA
16µs
1µs
65µs
DELAY
DELAY
DELAY
READY
RESET OR
FAULT MODE BLANK
100µA
CB TRIPS
CB TRIPS
OV TRIPS
GATE ON
GATE
LOGIC
50µs
DELAY
6.5V
CLAMP
CIRCUIT
+
–
ARM
ARM
COMP
RESET
STARTUP
NORMAL MODE
GATE ON/OFF
+–
GSARM
V
SENSEN
GATEOFF
80µs
DELAY
60µs
DELAY
8µs 5µs
DELAY
COMP1
UV COMP
COMP2
–
+
+
–
+
–
0.4V
V
2.07V
0.8V
CC
4213 BD
ON
GND
Rev. A
8
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LTC4213
TIMING DIAGRAM
1
2
3
4
5
6
V
V
ON(TH)
ON(TH)
V
– V
ON(HYST)
ON(TH)
V
ON
V
GSMAX
V
– 0.3V
GSMAX
0.3V
V
0.3V
GATE
t
t
t
ON
DEBOUNCE
OFF
4213 TD
1
2
3
4
5
1.2V
∆V
SENSE
V
GATE
V
GSMAX
V
– 0.3V
GSMAX
0.3V
V
ON
V
ON(TH)
V
ON(RST)
4213 TD
t
t
RESET
FAULT(FAST)
Rev. A
9
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LTC4213
OPERATION
Overview
thresholds of SLOWCOMP and FASTCOMP are V and
CB
V
. The I pin selects one of the three settings:
CB(FAST)
SEL
The LTC4213 is an electronic circuit breaker (ECB) that senses
load current with the the RDS(ON) of the external MOSFET
instead of using an external sense resistor. This No RSENSE
method is less precise than RSENSE method due to the variation
1. V = 25mV and V
= 100mV with I at GND
CB
CB(FAST)
SEL
2. V = 50mV and V
= 175mV with ISEL floating
CB
CB(FAST)
3. V = 100mV and V
= 325mV with I at V
SEL CC
CB
CB(FAST)
of R
. However, the advantages are less complex, lower
costDaSn(OdNr)educe voltage and power loss in the switch path
owing to the absence of a sense resistor. Without the exter-
I
can be stepped dynamically, such as to allow a higher
SEL
circuit breaker threshold at startup and a lower threshold
after supply current has settled. The inputs of the compar-
ators are SENSEP and SENSEN pins. The voltage across
the drain and source of the external MOSFET is sensed at
SENSEP and SENSEN.
nal sense resistor voltage drop, the V
improvement can
OUT
be quite significant especially in the low voltage applications.
The LTC4213 is designed to operate over a bias supply range
from 2.3V to 6V. When bias supply voltage and the ON pin are
sufficiently high, the GATE pin starts charging after an internal
debounce delay of 60µs. During the GATE ramp-up, the circuit
breaker is not armed until the external MOSFET is fully turned
on. Once the circuit breaker is armed, the LTC4213 monitors
ΔVSENSE = VSENSEP − VSENSEN
(1)
When ∆VSENSE exceeds the VCB threshold but is less than
V
, the comparator SLOWCOMP trips the circuit
CB(FAST)
the load current through the R
of the external MOSFET.
DS(ON)
breaker after a 16µs delay. If ∆VSENSE is greater than
VCB(FAST), the comparator FASTCOMP trips the circuit
breaker in 1µs.
Circuit Breaker Function
The LTC4213 provides dual level and dual response time
circuit breaker functions for overcurrent protection.
A severe short circuit condition can cause the load supply
to dip substantially. This does not pose a problem for the
LTC4213 as the input stages of the current limit compar-
ators are common mode to ground.
The LTC4213 circuit breaker function block consists
of two comparators, SLOWCOMP and FASTCOMP. The
APPLICATIONS INFORMATION
Figure 1 shows an electronic circuit breaker (ECB) appli-
pins sense the load current at the drain and source of
the external MOSFET. In ECB applications, large input
bypass capacitors are usually recommended for good
transient performance.
cation. An external auxiliary supply biases the VCC pin
and the internal circuitry. A V load supply powers the
IN
load via an external MOSFET. The SENSEP and SENSEN
Q1
SI4864DY
Undervoltage Lockout
V
V
OUT
1.25V
3.5A
IN
1.25V
+
+
C
C
IN
LOAD
100µF
An internal undervoltage lockout (UVLO) circuit resets the
100µF
LTC4213 if the V supply is too low for normal opera-
CC
tion. The UVLO comparator (UVCOMP) has a low-to-high
threshold of 2.07V and 100mV of hysteresis. UVLO shares
the glitch filters for both low-to-high transition (startup)
and high-to-low transition (reset) with the ON pin com-
parators. Above 2.07V bias supply voltage, the LTC4213
starts if the ON pin conditions are met. Short, shallow
bus bias supply transient dips below 1.97V of less than
80µs are ignored.
V
SENSEP GATE SENSEN
BIAS
2.5V
V
CC
V
CC
C1
0.1µF
LTC4213
GND
R4
10k
OFF ON
ON
READY
I
SEL
4213 F01
Figure 1. LTC4213 Electronic Circuit Breaker Application
Rev. A
10
For more information www.analog.com
LTC4213
APPLICATIONS INFORMATION
ON Function
minimized. Driving beyond this recommended VGS voltage
yields a marginal decrease in RDS(ON) . At start-up, the
gate voltage starts at ground potential. The GATE ramps
past the MOSFET threshold and the load current begins
When V is below comparator COMP1’s threshold of
ON
0.4V for 80µs, the device resets. The system leaves reset
mode if the ON pin rises above comparator COMP2’s
threshold of 0.8V and the UVLO condition is met. Leaving
reset mode, the GATE pin starts up after a tDEBOUNCE delay
of 60µs. When ON goes below 0.76V, the GATE shuts off
after a 5µs glitch filter delay. The output is discharged by
to flow. When V exceeds ∆V
, the circuit breaker
GS
GSARM
is armed and enabled. The chosen MOSFET should have a
recommended minimum VGS drive level that is lower than
∆V
. Finally, V reaches a maximum at ∆V
.
GSARM
GS
GSMAX
the external load when V is in between 0.4V to 0.8V.
ON
Trip and Reset Circuit Breaker
At this state, the ON pin can re-enable the GATE if V
ON
Figure 2 shows the timing diagram of V
and V
exceeds 0.8V for more than 8µs. Alternatively, the device
after a fault condition. A tripped circuitGbATrEeaker cRanEAbDeY
resets if the ON pin is brought below 0.4V for 80µs. Once
reset either by cycling the V bias supply below UVLO
reset, the GATE pin restarts only after the t
60µs
CC
DEBOUNCE
threshold or pulling ON below 0.4V for >t
. Figure 3
delay at VON rising above 0.8V. To protect the ON pin
from overvoltage stress due to supply transients, a series
resistor of greater than 10k is recommended when the
ON pin is connected directly to the supply. An external
resistive divider at the ON pin can be used with COMP2
to set a supply undervoltage lockout value higher than the
internal UVLO circuit. An RC filter can be implemented at
the ON pin to increase the power-up delay time beyond
the internal 60µs delay.
shows the timing diagram for a tripped RcEirScEuTit breaker
being reset by the ON pin.
Calculating Current Limit
The fault current limit is determined by the R
of the
(2)
DS(ON)
MOSFET and the circuit breaker voltage V .
CB
VCB
RDS(ON)
ILIMIT
=
Gate Function
The RDS(ON) value depends on the manufacturer’s dis-
tribution, VGS and junction temperature. Short Kelvin-
sense connections between the MOSFET drain and
source to the LTC4213 SENSEP and SENSEN pins are
strongly recommended.
The GATE pin is held low in reset mode. 60µs after leaving
reset mode, the GATE pin is charged up by an internal
100µA current source. The circuit breaker arms when
V
GATE
> V
+ ∆
. In normal mode operation,
SENSEN
VGSARM
the GATE peak voltage is internally clamped to ∆V
GSMAX
For a selected MOSFET, the nominal load limit current is
given by:
above the SENSEN pin. When the circuit breaker trips, an
internal MOSFET shorts the GATE pin to GND, turning off
the external MOSFET.
VCB(NOM)
ILIMIT(NOM)
=
(3)
(4)
RDS(ON)(NOM)
READY Status
The READY pin is held low during reset and at startup. It
is pulled high by an external pull-up resistor 50µs after
the circuit breaker arms. The READY pin pulls low if the
circuit breaker trips or the ON pin is pulled below 0.76V,
The minimum load limit current is given by:
VCB(MIN)
ILIMIT(MIN)
=
RDS(ON)(MAX)
or V drops below undervoltage lockout.
CC
The maximum load limit current is given by:
∆V
and V
GSMAX
GSARM
Each MOSFET has a recommended VGS drive voltage
where the channel is deemed fully enhanced and RDS(ON) is
Rev. A
11
For more information www.analog.com
LTC4213
APPLICATIONS INFORMATION
Example Current Limit Calculation
VCB(MAX)
ILIMIT(MAX)
=
(5)
RDS(ON)(MIN)
An Si4410DY is used for current detection in a 5V
supply system with the LTC4213 VCB at 25mV (ISEL
pin grounded).
Most MOSFET data sheets have an R
specification
DS(ON)
with typical and maximum values but no minimum value.
Assuming a normal distribution with typical as mean, the
minimum value can be estimated as:
The R
distribution for the Si4410DY is:
DS(ON)
Typical R
= 0.015Ω = 100%
DS(ON)
Maximum R
= 0.02Ω = 133.3%
RDS(ON)(MIN) = 2•RDS(ON)(NOM) −RDS(ON)(MAX)
(6)
DS(ON)
Estimated MIN R
= 2 • 15 – 20 = 0.010Ω = 66.7%
DS(ON)
The R
R
variation due to gate drive is:
DS(ON)
The LTC4213 gives higher gate drive than the manufac-
turer specified gate drive for R This gives a slightly
@ 4.5V = 0.015Ω = 100% (spec. TYP)
DS(ON)
GS
DS(ON)
lower R
than specified. Operating temperature also
DS(ON)
R
DS(ON)
R
DS(ON)
R
DS(ON)
@ 4.8V = 0.014Ω = 93% (MIN ∆V
)
GS
GSMAX
modulates the R
value.
DS(ON)
@ 7V = 0.0123Ω = 82% (NOM ∆V
)
GS
GSMAX
@ 8V = 0.012Ω = 80% (MAX ∆V
)
GS
GSMAX
CIRCUIT BREAKER TRIPS
GATE AND READY PINS PULL LOW
SHORT CIRCUIT
A
B
>V
V
CB
CB
∆V
SENSE
CB TRIPS
V
GATE
V
READY
t
4213 F02
FAULT
Figure 2. Short Circuit Fault Timing Diagram
Rev. A
12
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LTC4213
APPLICATIONS INFORMATION
CIRCUIT BREAKER TRIPS
GATE AND READY PINS PULL LOW
SHORT CIRCUIT
NOT RESET
RESET REINITIALIZE
6 7 8
RESTART
1
2
3
4
5
V
V
> 2.07V
CC
ON
0.8V
0.76V
0.4V
0V
>V
V
CB
CB
∆V
SENSE
t
FAULT
CB TRIPS
V
GATE
V
READY
V
< 0.4V
ON
DURATION > t
RESET
t
DEBOUNCE
NORMAL MODE
FAULT LATCHED OFF
STARTUP CYCLE
4213 F03
Figure 3. Resetting Fault Timing Diagram
Rev. A
13
For more information www.analog.com
LTC4213
APPLICATIONS INFORMATION
Operating temperature of 0° to 70°C.
various operating V . From this table users can refer to
CC
the MOSFET’s data sheet to obtain the R
value.
DS(ON)(NOM)
R
DS(ON)
R
DS(ON)
R
DS(ON)
at 25°C = 100%
at 0°C = 90%
Table 1. Nominal Operating ∆VGSMAX for Typical Bias
Supply Voltage
at 70°C = 120%
V
(V)
∆V
GSMAX
(V)
CC
2.3
2.5
2.7
3.0
3.3
5.0
6.0
4.3
MOSFET resistance variation:
5.0
5.6
6.5
7.0
7.0
7.0
R
R
= 15m • 0.82 = 12.3mΩ
= 15m • 1.333 • 0.93 • 1.2 = 15m • 1.488
= 22.3mΩ
DS(ON)(NOM)
DS(ON)(MAX)
RDS(ON)(MIN) = 15m • 0.667 • 0.80 • 0.90 = 15m • 0.480
= 7.2mΩ
V
CB
variation:
Load Supply Power-Up after Circuit Breaker Armed
NOM V = 25mV = 100%
CB
Figure 4 shows a normal power-up sequence for the circuit
MIN V = 22.5mV = 90%
CB
in Figure 1 where the V load supply power-up after circuit
IN
breaker is armed. V is first powered up by an auxiliary
bias supply. VCC risCeCs above 2.07V at time point 1. VON
exceeds 0.8V at time point 2. After a 60µs debounce delay,
the GATE pin starts ramping up at time point 3. The external
MOSFET starts conducting at time point 4. At time point 5,
MAX V = 27.5mV = 110%
CB
The current limits are:
I
I
= 25mV/12.3mΩ = 2.03A
= 22.5mV/22.3mΩ = 1.01A
LIMIT(NOM)
LIMIT(MIN)
V
exceed ∆V
and the circuit breaker is armed.
GATE
After 50µs (t
GSARM
ILIMIT(MAX) = 27.5mV/7.2mΩ = 3.82A
delay), READY pulls high by an external
READY
For proper operation, the minimum current limit must
exceed the circuit maximum operating load current with
margin. So this system is suitable for operating load cur-
rent up to 1A. From this calculation, we can start with the
resistor at time point 6. READY signals the V load supply
IN
module to start its ramp. The load supply begins soft-start
ramp at time point 7. The load supply ramp rate must be
slow to prevent circuit breaker tripping as in Equation 8.
general rule for MOSFET R
by assuming maximum
DS(ON)
ΔV
Δt
IOPMAX −ILOAD
IN
operating load current is roughly half of the I
Equation 7 shows the rule of thumb.
.
<
(8)
LIMIT(NOM)
CLOAD
VCB(NOM)
Where I
is the maximum operating current defined
OPMAX
by Equation 7.
IOPMAX
=
(7)
2 •RDS(ON)(NOM)
For illustration, V = 25mV and R
= 3.5mΩ at the
CB
nominal operating ∆VGSMAX. TheDmS(OaxNi)mum operating
current is 3.5A (refer to Equation 7). Assuming the load
can draw a current of 2A at power-up, there is a margin
Note that the R
is at the LTC4213 nominal
DS(ON)(NOM)
operating ∆VGSMAX rather than at typical vendor spec.
Table 1 gives the nominal operating ∆VGSMAX at the
of 1.5A available for C
of 100µF and V ramp rate
LOAD
IN
should be <15V/ms. At time point 8, the current through
the MOSFET reduces after C is fully charged.
LOAD
Rev. A
14
For more information www.analog.com
LTC4213
APPLICATIONS INFORMATION
CIRCUIT BREAKER ARMS
1
2
3
4
5
6 7
8
2.07V
0.8V
V
, V
CC ON
∆V
GSMAX
+ V
SENSEN
∆V
GSMAX
∆V
GSARM
V
th
100μA
V
V
GATE
, V
SENSEP SENSEN
V
READY
V
CB
∆V
SENSE
RESET MODE
t
STARTUP CYCLE
NORMAL CYCLE
DEBOUNCE
t
READY
4213 F04
Figure 4. Load Supply Power-Up After Circuit Breaker Armed
Rev. A
15
For more information www.analog.com
LTC4213
APPLICATIONS INFORMATION
Load Supply Power-Up Before V
∆V
> V . At time point 7, the GATE voltage peaks.
CC
SENSE CB
50µs after time point 6, READY goes HIGH.
Referring back to Figure 1, the V load supply can also
IN
be powered up before V . Figure 5 shows the timing
CC
Start-up Problems
diagram with the V load supply active initially. An inter-
IN
There is no current limit monitoring during output
charging for the Figure 5 power-up sequence where the
load supply is powered up before V . This is because
the GATE voltage is below ∆VGSARMCCand the MOSFET
may not reach the specified R
ply should have sufficient capability to handle the inrush
as the output charges up. For proper startup, the final
nal circuit ensures that the GATE pin is held low. At time
point 1, V clears UVLO and at time point 2, ON clears
CC
0.8V. 60µs later at time point 3, the GATE is ramped up
with 100µA. At time point 4, GATE reaches the external
. The V load sup-
DS(ON)
MOSFET threshold V and V
starts to ramp up. At
IN
TH
OUT
time point 5, V
is near its peak. At time point 6, the
SENSEN
circuit breaker is armed and the circuit breaker can trip if
CIRCUIT BREAKER ARMS
V
– V
= V
V
MAXES OUT
SENSEP
SENSEN
CB
GATE
READY SIGNALS
0
1
2
3
4
5
6
7
8
V
> 2.07V
CC
V
> 0.8V
ON
V , V
CC ON
∆V
GSMAX
+ V
SENSEN
∆V
+ V
SENSEN
GSARM
V
th
V
GATE
V
V
SENSEP
SENSEN
V
READY
t
READY
t
RESET MODE
DEBOUNCE
STARTUP CYCLE
NORMAL CYCLE
4213 F05
Figure 5. Load Supply Power-Up Before VCC
Rev. A
16
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LTC4213
APPLICATIONS INFORMATION
load at time point 6 should be within the circuit breaker
limits. Otherwise, the system fails to start and the circuit
breaker trips immediately after arming. In most applica-
tions additional external gate capacitance is not required
The selected MOSFET VGS absolute maximum rating
should meet the LTC4213 maximum ∆V
of 8V.
GSMAX
Other MOSFET criteria such as V
, I
, and R
DMAX
should be reviewed. Spikes andBriDnSgSing above maxDimS(uOmN)
operating voltage should be considered when choosing
unless C
is large and startup becomes problematic.
LOAD
If an external gate capacitor is employed, its capacitance
value should not be excessive unless it is used with a
series resistor. This is because a big gate capacitor with-
out resistor slows down the GATE turn off during a fault.
An alternative method would be a stepped ISEL pin to allow
a higher current limit during startup.
V
. I
should be greater than the current limit. The
BDSS
maximuDmMAoXperating load current is determined by the
R
value. See the Calculating Current Limit section
DS(ON)
for details.
Supply Requirements
In the event of output short circuit or a severe overload,
the load supply can collapse during GATE ramp up due
to load supply current limit. The chosen MOSFET must
withstand this possible brief short circuit condition before
time point 6 where the circuit breaker is allowed to trip.
Bench short circuit evaluation is a practical verification
of a reliable design. To have current limit while powering
a MOSFET into short circuit conditions, it is preferred
that the load supply sequences to turn on after the circuit
breaker is armed as described in an earlier section.
The LTC4213 can be powered from a single supply or
dual supply system. The load supply is connected to the
SENSEP pin and the drain of the external MOSFET. In the
single supply case, the V pin is connected to the load
CC
supply, preferably with an RC filter. With dual supplies,
V
V
is connected to an auxiliary bias supply V
AUX
where
CC
AUX
voltage should be greater or equal to the load sup-
ply voltage. The load supply voltage must be capable of
sourcing more current than the circuit breaker limit. If
the load supply current limit is below the circuit breaker
trip current, the LTC4213 may not react when the output
overloads. Furthermore, output overloads may trigger
UVLO if the load supply has foldback current limit in a
single supply system.
Power-Off Cycle
The system can be powered off by toggling the ON pin
low. When ON is brought below 0.76V for 5µs, the GATE
and READY pins are pulled low. The system resets when
ON is brought below 0.4V for 80µs.
V Transient and Overvoltage Protection
IN
Input transient spikes are commonly observed whenever
the LTC4213 responds to overload. These spikes can be
large in amplitude, especially given that large decoupling
capacitors are absent in hot swap environments. These
short spikes can be clipped with a transient suppressor
of adequate voltage and power rating. In addition, the
LTC4213 can detect a prolonged overvoltage condition.
MOSFET Selection
The LTC4213 is designed to be used with logic (5V) and
sub-logic (3V) MOSFETs for V potentials above 2.97V
CC
with ∆VGSMAX exceeding 4.5V. For a VCC supply range
between 2.3V and 2.97V, sub-logic MOSFETs should be
used as the minimum ∆V
is less than 4.5V.
GSMAX
When SENSEP exceeds V + 0.7V for more than 65µs,
CC
the LTC4213’s internal overvoltage protection circuit
Rev. A
17
For more information www.analog.com
LTC4213
APPLICATIONS INFORMATION
activates and the GATE pin pulls down and turns off the
external MOSFET.
Typical Single Supply Hot Swap Application
A typical single supply hot swap application is shown in
Figure 7. The RESET signal at the backplane is held low
initially. When the PCB long edge makes contact the ON
pin is held low (<0.4V) and the LTC4213 is kept in reset
Typical Electronic Fuse Application for a Single
Supply System
Figure 6 shows a single supply electronic fuse applica-
mode. When the short edge makes contact the V load
IN
tion. An RC filter at V pin filters out transient spikes.
supply is connected to the card. The V is biased via
CC
CC
An optional Schottky diode can be added if severe V
the RC filter. The V
is pre-charged via R5. To pow-
CC
OUT
dips during a fault start-up condition is a concern. The
use of the Schottky and RC filter combination is allowed
if the load supply is above 2.9V and the total voltage drop
towards the VCC pin is less than 0.4V. The LTC4213’s
internal UVLO filter further rejects bias supply’s transients
er-up successfully, the R5 resistor value should be small
enough to provide the load requirement and to overcome
the 280µA current source sinking into the SENSEN pin.
On the other hand, the R5 resistor value should be big
enough avoiding big inrush current and preventing big
short circuit current. When RESET signals high at back-
plane, C2 capacitor at the ON pin charges up via the R3/
R2 resistive divider. When ON pin voltage exceeds 0.8V,
the GATE pin begins to ramp up. When the GATE voltage
peaks, the external MOSFET is fully turned on and the
of less than t
During power-up, it is good engineer-
RESET.
ing practice to ensure that V is fully established before
CC
the ON pin enables the system at V = 0.8V. In this appli-
cation, the V voltage reached finOaNl value approximately
CC
after a 5.3 • R C delay. This is followed by the ON pin
1
1
exceeding 0.8V after a 0.17 • R C delay. The GATE pin
V -to-V
voltage drop reduces. In normal mode oper-
2 2
DEBOUNCE
IN
OUT
starts up after an internal t
delay.
ation, the LTC4213 monitors the load current through the
of the external MOSFET.
R
DS(ON)
Q1
SI4410DY
V
V
5V
1A
IN
5V
OUT
D1
MBRO520L
+
+
C
C
LOAD
IN
100μF
100μF
R1
33Ω
SENSEP GATE SENSEN
R3
V
CC
V
324k
IN
C1
10μF
LTC4213
READY
R4
10k
ON
GND
I
SEL
Q2
2N7002
R2
80.6k
C2
0.22μF
RESET
4213 F06
Figure 6. Single Supply Electronic Fuse
Rev. A
18
For more information www.analog.com
LTC4213
PACKAGE DESCRIPTION
DDB Package
8-Lead Plastic DFN (3mm × 2mm)
(Reference LTC DWG # 05-08-ꢀ702 Rev C)
0.6ꢀ 0.05
0.70 0.05
2.55 0.05
ꢀ.ꢀ5 0.05
PACKAGE
OUTLINE
0.25 0.05
0.50 BSC
2.20 0.05
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
R = 0.ꢀꢀ5
0.40 0.ꢀ0
3.00 0.ꢀ0
TYP
5
R = 0.05
8
TYP
2.00 0.ꢀ0
0.75 0.05
PIN ꢀ BAR
TOP MARK
PIN ꢀ
R = 0.20 OR
(SEE NOTE 6)
0.25 × 45°
0.56 0.05
CHAMFER
4
ꢀ
(DDB8) DFN ꢀꢀꢀ6 REV C
0.25 0.05
0.200 REF
0.50 BSC
2.ꢀ5 0.05
0 – 0.05
BOTTOM VIEW—EXPOSED PAD
NOTE:
ꢀ. DRAWING CONFORMS TO VERSION (WECD-ꢀ) IN JEDEC PACKAGE OUTLINE M0-229
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.ꢀ5mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN ꢀ LOCATION ON THE TOP AND BOTTOM OF PACKAGE
Rev. A
19
For more information www.analog.com
LTC4213
PACKAGE DESCRIPTION
TS8 Package
8-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1637 Rev A)
2.90 BSC
(NOTE 4)
0.40
MAX
0.65
REF
1.22 REF
1.50 – 1.75
(NOTE 4)
2.80 BSC
1.4 MIN
3.85 MAX 2.62 REF
PIN ONE ID
RECOMMENDED SOLDER PAD LAYOUT
PER IPC CALCULATOR
0.22 – 0.36
8 PLCS (NOTE 3)
0.65 BSC
0.80 – 0.90
0.20 BSC
DATUM ‘A’
0.01 – 0.10
1.00 MAX
0.30 – 0.50 REF
1.95 BSC
TS8 TSOT-23 0710 REV A
0.09 – 0.20
(NOTE 3)
NOTE:
1. DIMENSIONS ARE IN MILLIMETERS
2. DRAWING NOT TO SCALE
3. DIMENSIONS ARE INCLUSIVE OF PLATING
4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
5. MOLD FLASH SHALL NOT EXCEED 0.254mm
6. JEDEC PACKAGE REFERENCE IS MO-193
Rev. A
20
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LTC4213
REVISION HISTORY
REV
DATE
DESCRIPTION
PAGE NUMBER
A
12/21 Added a new TSOT-23 (ThinSOT) package.
Added the TSOT-23 pin configuration and the TSOT-23 order information.
Updated Pin Functions section for TSOT-23.
Removed pin number in the Block Diagram.
Changed DDB package outline to Rev C.
1
2
7
8
19
20
22
Added the TSOT-23 package Outline.
Added part LTC4246 in the Related Parts table.
Rev. A
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog
Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications
21
subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
LTC4213
TYPICAL APPLICATION
V
IN
STAGGERED
PCB EDGE
CONNECTOR
R5
Q1
IRF7455
330Ω
V
V
3.3V
3.6A
IN
OUT
3.3V
R3
Zx
182k
SMAJ6.0A
+
C
LOAD
100µF
D1
BAT54ALT1
SENSEP GATE
LTC4213
SENSEN
ON
RESET
R1
68Ω
R2
80.6k
C2
1μF
R4
10k
V
CC
READY
C1
2.2µF
I
GND
SEL
NC
4213 F07
BACKPLANE GND
CARD GND
Figure 7. Single Supply Hot Board Insertion
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LTC1421
Dual Channel, Hot Swap Controller
Single Channel, Hot Swap Controller in SO-8
Fault Protected, Hot Swap Controller
PCI Hot Swap Controllers
24-Pin, Operates from 3V to 12V and Supports –12V
Operates from 2.7V to 12V, System Reset Output
Operates up to 16.5V, Overvoltage Protection to 33V
3.3V, 5V and 12V Supplies
LTC1422
LTC1642
LTC1643AL/
LTC1643AH
LTC1645
LTC1647
LTC4210
LTC4211
LTC4216
LTC4221
LTC4230
LTC4251
LTC4252
LTC4253
Dual Channel Hot Swap Controller
Operates from 1.2V to 12V, Power Sequencing
Operates from 2.7V to 16.5V
Dual Channel, Hot Swap Controller
Single Channel, Hot Swap Controller in SOT-23
Single Channel, Hot Swap Controller in MSOP
Ultra Low Voltage Hot Swap Controller
Dual Channel, Hot Swap Controller
Operates from 2.7V to 16.5V, Multifunction Current Control
2.5V to 16.5V, Multifunction Current Control
Operates from 2.7V to 16.5V, Multifunction Current
Protects Load Voltages from 0V to 6V
Triple Channel, Hot Swap Controller
–48V Hot Swap Controller in S0T-23
–48V Hot Swap Controller in MSOP
–48V Hot Swap Controller and Sequencer
1.7V to 16.5V, Multifunction Current Control
–48V Hot Swap Controller, Active Current Limiting
Active Current Limiting with Drain Acceleration
Active Current Limiting with Drain Acceleration and Three
Sequenced Power Good Outputs
LTC4246
Octal Electronic Circuit Breaker
0V to 13.2V, 30mΩ R , SPI Interface
ON
Rev. A
11/21
www.analog.com
ANALOG DEVICES, INC. 2005-2021
22
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