MAX14523CATA+T [MAXIM]
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| 型号： | MAX14523CATA+T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 暂无描述 开关 |
| 文件： | 总11页 (文件大小：287K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-4814; Rev 1; 1/11
250mA to 1.5A, Adjustable
Current-Limit Switches
LB/MAX14523C
General Description
Features
The MAX14523A/MAX14523AL/MAX14523B/MAX14523C
programmable current-limit switches feature internal
current limiting to prevent damage to host devices due
to faulty load conditions. These current-limit switches
feature a low 70mΩ on-resistance and operate from a
+1.7V to +5.5V input voltage range. The current limit is
adjustable from 250mA to 1.5A, making these devices
ideal for SDIO (secure digital input/output) and other
load-switching applications.
♦ Accurate (±±10% ꢀOerꢁlaꢂ ꢃurreꢄt ꢅLiLt
♦ Aꢂjustabꢁe ꢃurreꢄt-ꢅLiLt Threshlꢁꢂ
♦ ꢅlw-Drlplut Vlꢁtage (71iV at ±A ꢅlaꢂ ꢃurreꢄt%
♦ Shlrt-ꢃLrcuLt PrltectLlꢄ
♦ Theriaꢁ-Shutꢂlwꢄ PrltectLlꢄ
♦ ReOerse-ꢃurreꢄt PrltectLlꢄ
Each device in the family handles an overcurrent event
differently depending on the option selected. The
MAX14523A/MAX14523AL go into an autoretry mode,
the MAX14523B latches off the switch, and the
MAX14523C features a continuous current-limit mode.
Additional safety features include thermal shutdown to
prevent overheating and reverse-current blocking to
prevent current from being driven back into the source.
♦ ±71µA (typ% Suppꢁy ꢃurreꢄt
♦ Shutꢂlwꢄ ReOerse ꢃurreꢄt, 1.6µA (iax%
♦ +±.7V tl +5.5V Suppꢁy Vlꢁtage Raꢄge
♦ TLꢄy 8-PLꢄ, 3ii x 3ii, TDFN Package
Typical Operating Circuit
The MAX14523A/MAX14523AL/MAX14523B/MAX14523C
are available in a tiny 8-pin, 3mm x 3mm, TDFN pack-
age and operate over the -40°C to +125°C automotive
temperature range.
BIAS
VOLTAGE
IN
OUT
LOAD
POWER
SUPPLY
1μF
1μF
CHARGE
PUMP
Applications
SDIO Ports
R
SETI
CURRENT
REFERENCE
CONTROL
LOGIC
USB Ports
V
PULLUP
μP
Notebook VGA Ports
GPS
10kΩ
FLAG
N.C.
ON(ON)*
Cell Phones
MAX14523A
MAX14523AL
MAX14523B
MAX14523C
MP3 Players
UTCA/ATCA Platforms
GND
*ON FOR THE MAX14523AL ONLY.
PLꢄ ꢃlꢄfLguratLlꢄ appears at eꢄꢂ lf ꢂata sheet.
Ordering Information/Selector Guide
PART
PIN-PACKAGE
8 TDFN-EP*
8 TDFN-EP*
8 TDFN-EP*
8 TDFN-EP*
8 TDFN-EP*
TOP MARK
BLO
ON POLARTIY
Active-High
Active-Low
Active-High
Active-High
Active-High
OVERCURRENT RESPONSE
Autoretry
MAX14523AATA+
MAX14523ALATA+**
MAX14523BATA+
MAX14523BATA/V+T
MAX14523CATA+
BLP
Autoretry
BLQ
Latch-Off
BLQ
Latch-Off
BLS
Continuous
Nlte: All devices are specified over the -40°C to +125°C operating temperature range.
+Denotes a lead(Pb)-free package/RoHs-compliant package.
/V denotes an automotive qualified part.
*EP = Exposed pad.
**Future product—contact factory for availability.
________________________________________________________________ MaxLi Iꢄtegrateꢂ Prlꢂucts
±
Flr prLcLꢄg, ꢂeꢁLOery, aꢄꢂ lrꢂerLꢄg LꢄflriatLlꢄ, pꢁease clꢄtact MaxLi DLrect at ±-888-629-4642,
lr OLsLt MaxLi’s websLte at www.iaxLi-Lc.cli.
250mA to 1.5A, Adjustable
Current-Limit Switches
ABSꢀꢅUTE MAXIMUM RATINGS
(All voltages referenced to GND.)
Operating Temperature Range .........................-40°C to +125°C
IN, ON, ON, FLAG, OUT, and SETI to GND.............-0.3V to +6V
Current into Any Pin (Except IN, OUT)................................20mA
Out Short Circuit to GND...................................Internally Limited
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
Continuous Power Dissipation (T = +70°C) for multilayer board:
A
TDFN (derate 24.4mW/°C above +70°C)...................1952mW
PAꢃKAGE THERMAꢅ ꢃHARAꢃTERISTIꢃS (Nlte ±%
TDFN
Junction-to-Ambient Thermal Resistance (θ ) ...........41°C/W
JA
Junction-to-Case Thermal Resistance (θ )..................8°C/W
JC
Nlte ±: 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.iaxLi-Lc.cli/theriaꢁ-tutlrLaꢁ.
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.
EꢅEꢃTRIꢃAꢅ ꢃHARAꢃTERISTIꢃS
(V = +1.7V to +5.5V, R
= 94.2kΩ, C = C
= 1µF, and T = T = -40°C to +125°C, unless otherwise noted. Typical values
OUT A J
IN
SETI
IN
are at V = +3.3V, T = +25°C.) (Note 2)
IN
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
SUPPLY OPERATION
Operating Voltage
Quiescent Current
V
1.7
5.5
V
IN
I
I
= 0A, switch on, V = 3.3V
170
10
300
μA
Q
OUT
IN
V
= 3.3V, I
= 0A , after an overcurrent
OUT
IN
Latchoff Current
I
20
7
μA
μA
μA
LATCH
fault (MAX14523B)
Shutdown Forward Current
Shutdown Reverse Current
I
V
= 0V, V
= V , V = 5.5V, V = 0V
OUT
0.5
SHDN
ON
ON
IN IN
V
= 0V, V
= V , V = 1.7V, V
=
OUT
ON
ON
IN IN
I
0.01
0.6
RSHDN
5.5V (current into OUT)
INTERNAL FET
Switch-On Resistance
R
V
= 3.3V, I
lower than I
LIM
70
130
1650
275
mꢀ
ON
IN
OUT
R
R
= 91.78kꢀ, V - V = 1V
OUT
1350
225
1500
250
SETI
SETI
IN
Forward-Current Limit
I
mA
LIM
= 563.12kꢀ, V - V
= 1V
OUT
IN
I
V
= 250mA to 1500mA,
LIM
(R
+2.48kꢀ) × I
Product
127.2
141.4
155.5
2
kV
μA
mV
mV
SETI
LIM
- V
= 1V
OUT
IN
V
> V + 140mV, after reverse-current-
OUT
IN
Reverse Blocking Current
limit shutdown
V
- V = 300mV, OUT falling until
OUT
IN
Reverse Blocking Threshold
V
- V
40
95
140
OUT
IN
switch turns on
FLAG Assertion Drop Voltage
Threshold
Increase (V - V
asserts, I
) drop until FLAG
OUT
IN
V
350
FA
limiting, V = 3.3V
OUT IN
ON, ON INPUT
LB/MAX14523C
ON, ON Input Leakage
I
V
, V
ON ON
= V or V
GND
-1
+1
μA
V
LEAK
IN
ON, ON Input Logic-High Voltage
ON, ON Input Logic-Low Voltage
V
1.6
IH
V
0.4
V
IL
2
_______________________________________________________________________________________
250mA to 1.5A, Adjustable
Current-Limit Switches
LB/MAX14523C
EꢅEꢃTRIꢃAꢅ ꢃHARAꢃTERISTIꢃS (clꢄtLꢄueꢂ%
(V = +1.7V to +5.5V, R
= 94.2kΩ, C = C
= 1µF, and T = T = -40°C to +125°C, unless otherwise noted. Typical values
OUT A J
IN
SETI
IN
are at V = +3.3V, T = +25°C.) (Note 2)
IN
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
FLAG OUTPUT
FLAG Output Logic-Low Voltage
FLAG Output Leakage Current
DYNAMIC
I
= 1mA
0.4
1
V
SINK
V
= V
= 5.5V, FLAG deasserted
μA
IN
FLAG
Time from ENABLE signal to V
= 90%
= 10%
OUT
Turn-On Time
t
1
ms
μs
μs
SS
of V = 3.3V, Figure 1
IN
Time from DISABLE signal to V
OUT
Turn-Off Time
t
250
OFF
of V = 3.3V, R = 20ꢀ, Figure 1
IN
L
V
= 3.3V, R
= 91.78kꢀ to 563.12kꢀ,
IN
SETI
Current-Limit Reaction Time
t
3
LIM
output high and then short-circuit applied
Blanking Time
t
(Note 3)
10
14.5
25
ms
ms
BLANK
Retry Time
t
MAX14523A/MAX14523AL (Note 3)
320
875
RETRY
THERMAL PROTECTION
Thermal Shutdown
Thermal Shutdown Hysteresis
Low-to-high
+170
15
°C
°C
Nlte 2: All devices are 100% tested at 125°C. Electrical limits across the full temperature range are guaranteed by design and correlation.
t
RETRY
Nlte 3: Blanking time and retry time are generated by the same oscillator. Therefore, the ratio of
is a constant value of 32.
t
BLANK
See Figures 2 and 3.
ON(ON)*
t
SS
90% V
IN
V
OUT
10% V
IN
t
OFF
*( ) THE POLARITY OF THE SIGNAL IS REVERSED FOR THE MAX14523AL ONLY.
Figure 1. Timing Diagram for Measuring Turn-On Time (t ) and Turn-Off Time (t
)
OFF
SS
_______________________________________________________________________________________
3
250mA to 1.5A, Adjustable
Current-Limit Switches
t
t
t
t
t
t
BLANK
BLANK
RETRY
BLANK
RETRY
BLANK
OUT
CURRENT LIMIT
LOAD CURRENT
THE DEVICE GOES TO
THERMAL-SHUTDOWN MODE
FLAG
Figure 2. Autoretry Fault Diagram
t
t
BLANK
BLANK
OUT
CURRENT LIMIT
LOAD CURRENT
THE DEVICE GOES TO
THERMAL-SHUTDOWN MODE
FLAG
LB/MAX14523C
Figure 3. Latchoff Fault Diagram
4
_______________________________________________________________________________________
250mA to 1.5A, Adjustable
Current-Limit Switches
LB/MAX14523C
Typical Operating Characteristics
(V = +3.3V, C = 1µF, C
= 1µF, R
= 94.2kΩ, T = +25°C, unless otherwise noted.)
IN
IN
OUT
SETI A
NORMALIZED CURRENT LIMIT
vs. TEMPERATURE
QUIESCENT SUPPLY CURRENT
vs. SUPPLY VOLTAGE
CURRENT LIMIT vs. SUPPLY VOLTAGE
1.60
1.10
1.05
1.00
0.95
0.90
300
250
200
150
100
1.55
1.50
1.45
1.40
1.70
2.65
3.60
4.55
5.50
-40
-7
26
59
92
125
1.70
2.65
3.60
4.55
5.50
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
SUPPLY VOLTAGE (V)
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
SHUTDOWN FORWARD CURRENT
vs. TEMPERATURE
QUIESCENT SUPPLY CURRENT
vs. TEMPERATURE
300
250
200
150
100
10
9
8
7
6
5
4
3
2
1
0
10
9
8
7
6
5
4
3
2
1
0
V
= 0V
V
= 0V, V
= 0V
ON
ON
OUT
V
= +5V
IN
V
= +5.5V
= +1.7V
IN
V
IN
= +5V
V
IN
V
= +3.3V
IN
V
= +3.3V
IN
-40
-7
26
59
92
125
-40
-7
26
59
92
125
-40
-7
26
59
92
125
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
_______________________________________________________________________________________
5
250mA to 1.5A, Adjustable
Current-Limit Switches
Typical Operating Characteristics (continued)
(V = +3.3V, C = 1µF, C
= 1µF, R
= 94.2kΩ, T = +25°C, unless otherwise noted.)
IN
IN
OUT
SETI
A
SHUTDOWN REVERSE CURRENT
vs. TEMPERATURE
LATCHOFF CURRENT
vs. TEMPERATURE
NORMALIZED ON-RESISTANCE
vs. SUPPLY VOLTAGE
30
1.20
1.15
1.10
1.05
1.00
0.95
0.90
0.85
0.80
10
9
8
7
6
5
4
3
2
1
0
V
= 0V, V = +1.7V, V
= +5.5V
ON
IN
OUT
MAX14523B
25
V
IN
= +5.5V
20
15
10
5
V
IN
= +3.3V
0
-40
-7
26
59
92
125
1.70
2.65
3.60
4.55
5.50
-40
-7
26
59
92
125
TEMPERATURE (°C)
VOLTAGE (V)
TEMPERATURE (°C)
NORMALIZED ON-RESISTANCE
vs. SUPPLY TEMPERATURE
SWITCH TURN-ON TIME
vs. SUPPLY TEMPERATURE
SWITCH TURN-OFF TIME
vs. SUPPLY TEMPERATURE
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
1000
900
800
700
600
500
400
300
200
100
0
R
= 20Ω
R
= 20Ω
LOAD
LOAD
V
IN
= +5.0V
V
IN
= +5.0V
V
= +3.3V
IN
V
= +3.3V
IN
-40
-7
26
59
92
125
-40
-7
26
59
92
125
-40
-7
26
59
92
125
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
LB/MAX14523C
6
_______________________________________________________________________________________
250mA to 1.5A, Adjustable
Current-Limit Switches
LB/MAX14523C
Typical Operating Characteristics (continued)
(V = +3.3V, C = 1µF, C
= 1µF, R
= 94.2kΩ, T = +25°C, unless otherwise noted.)
IN
IN
OUT
SETI
A
CURRENT LIMIT RESPONSE
CURRENT LIMIT RESPONSE
FLAG RESPONSE (OVERLOAD CONDITION)
MAX14523A toc15
MAX14523A toc13
MAX14523A toc14
SUDDEN SHORT
APPLIED AT OUTPUT
R
= 16.5Ω TO SUDDEN SHORT
R
= 16.5Ω TO SUDDEN SHORT
LOAD
LOAD
APPLIED AT OUTPUT
APPLIED AT OUTPUT
V
OUT
V
FLAG
2V/div
V
OUT
2V/div
2V/div
I
OUT
10A/div
I
I
OUT
OUT
1A/div
1A/div
2μs/div
20ms/div
20ms/div
Pin Description
PIN
MAX14523A
MAX14523B
MAX14523C
NAME
FUNCTION
MAX14523AL
1, 6
2
1, 6
N.C.
No Connection. Not internally connected. Connect N.C. to GND or leave unconnected.
Open-Drain, Overload Indicator Output. FLAG goes low when the overload fault
duration exceeds the blanking time, reverse current is detected, thermal shutdown
mode is active, or SETI is connected to ground.
2
FLAG
Overload-Current Limit Adjust. Connect a resistor from SETI to GND to program the
overcurrent limit. If SETI is connected to GND the switch turns off and FLAG is
asserted. If SETI is unconnected the current limit is at 0mA. Do not connect any
capacitance larger than 20pF to SETI.
3
3
SETI
4
5
4
5
OUT
IN
Switch Output. Bypass OUT with a 1μF capacitor to GND.
Power Input. Bypass IN with a 1μF ceramic capacitor to GND. Use higher
capacitance if necessary to prevent large load transients from pulling down the
supply voltage.
7
ꢀ
8
ꢀ
7
ON
ON
Active-Low, Switch-ON Input. Drive ON low to turn on the switch.
Active-High, Switch-ON Input. Drive ON high to turn on the switch.
Ground
8
GND
Exposed Pad. Internally connected to GND. For enhanced thermal dissipation,
connect EP to a large copper ground plane. Do not use EP as the sole ground
connection.
—
—
EP
_______________________________________________________________________________________
7
250mA to 1.5A, Adjustable
Current-Limit Switches
Functional Diagram
REVERSE-
CURRENT
PROTECTION
IN
OUT
THERMAL
SHUTDOWN
BUFFER
CONTROL
FLAG
LOGIC
TIMING
CIRCUITRY
N.C.
MAX14523A
MAX14523AL
MAX14523B
MAX14523C
BANDGAP
REFERENCE
CURRENT
LIMIT
BUFFER
SETI
ON/(ON)*
GND
*( ) FOR THE MAX14523AL ONLY
Autoretry (MAX14523A/MAX14523AL)
When the forward current reaches the current thresh-
old, the t timer begins counting (Figure 2). FLAG
Detailed Description
The MAX14523A/MAX14523AL/MAX14523B/MAX14523C
programmable current-limit switches operate from
+1.7V to +5.5V and provide internal current limiting
adjustable from 250mA to 1.5A. These devices feature
a fixed blanking time, and a FLAG output that notifies
the processor when a fault condition is present.
BLANK
asserts if the overcurrent condition is present for
or longer. The timer resets if the overcurrent
t
BLANK
condition disappears before the blanking time (t
)
BLANK
) starts immedi-
has elapsed. A retry time delay (t
RETRY
ately after the blanking time has elapsed. During that
time, the switch latches off. At the end of t , the
RETRY
Programmable Current Limit/Threshold
A resistor from SETI to GND sets the current
limit/threshold for the switch (see the Setting the
Current Limit/Threshold section). If the output current is
limited at the current threshold value for a time equal to
switch turns on again. If the fault still exists, the cycle
repeats. If the fault has been removed, the switch stays
on. During this cycle, FLAG stays low. In autoretry, if
the die temperature exceeds +170°C (typ) due to self
heating, the MAX14523A/MAX14523AL go into thermal
shutdown until the die temperature drops by approxi-
mately 15°C (see the Thermal Shutdown section.)
LB/MAX14523C
or longer than t
, the output flag asserts and the
BLANK
MAX14523A/MAX14523AL enter the autoretry mode,
the MAX14523B latches off the switch, and the
MAX14523C enters the continuous current-limit mode.
8
_______________________________________________________________________________________
250mA to 1.5A, Adjustable
Current-Limit Switches
LB/MAX14523C
The autoretry feature saves system power in case of an
overcurrent or short-circuit condition. During t
Switch-On/Off Control
The ON input for the MAX14523A/MAX14523B/
MAX14523C and ON input for the MAX14523AL control
the switch, see Table 1. Toggle ON for the MAX14523B
to reset the fault condition once the short-circuit current
is detected and the device shuts down.
BLANK
time, when the switch is on, the supply current is held
at the current limit. During time t , when the switch
RETRY
is off, the current through the switch is zero. Thus, the
average output current is much less than the pro-
grammed current limit. Calculate the average output
current using the following equation:
Reverse-Current Protection
The MAX14523A/MAX14523AL/MAX14523B/MAX14523C
feature a reverse-current protection circuit that limits
the backflow current to 2µA when the reverse-current
protection circuitry has tripped. The switch turns off and
I
= I
[(t
)/(t
+ t
)]
LOAD
LIM BLANK
BLANK
RETRY
With a typical t
= 17.5ms and typical t
=
RETRY
BLANK
FLAG asserts without waiting for t
to elapse. The
BLANK
560ms, the duty cycle is 3%, resulting in a 97% power
savings over the switch being on the entire time.
switch turns back on and FLAG deasserts when V
-
IN
V
drops below the reverse-current threshold by
OUT
Latchoff (MAX14523B)
95mV (typ).
When the forward current reaches the current thresh-
FLAG Indicator
old, the t
timer begins counting (Figure 3). FLAG
BLANK
FLAG is an open-drain fault indicator output and
requires an external pullup resistor to a DC supply.
FLAG goes low when any of the following conditions
occur:
asserts if an overcurrent condition is present for greater
than t time. The timer resets if the overcurrent
BLANK
condition disappears before t
has elapsed.
BLANK
The switch turns off if the overcurrent condition contin-
ues beyond the blanking time. Reset the switch by
either toggling the control logic (ON or ON) or cycling
the input voltage. If the die temperature exceeds
+170°C (typ) due to self heating, the MAX14523B goes
into thermal shutdown until the die temperature
drops by approximately 15°C (see the Thermal
Shutdown section).
•
•
•
•
The blanking time has elapsed
The reverse-current protection has tripped
The die temperature exceeds +170°C
SETI is connected to ground.
Thermal Shutdown
Thermal-shutdown circuitry protects the devices from
overheating. The switch turns off and FLAG goes low
immediately when the junction temperature exceeds
+170°C (typ). The switch turns on again after the
device temperature drops by approximately 15°C (typ).
Continuous Current Limit (MAX14523C)
When the forward current reaches the forward-current
threshold, the MAX14523C limits the output current to
the programmed current limit. FLAG asserts if the cur-
rent limit is present for t
and deasserts when the
BLANK
Applications Information
overload condition is removed. In this mode, if die tem-
perature exceeds +170°C (typ) due to self heating, the
MAX14523C goes into thermal shutdown until the die
temperature drops by approximately 15°C (see the
Thermal Shutdown section).
Setting the Current Limit/Threshold
A resistor from SETI to ground programs the current
limit/threshold value for the MAX14523A/MAX14523AL/
MAX14523B/MAX14523C. Table 2 lists various current
limit/thresholds set by different resistor values at SETI.
Leaving SETI unconnected selects a 0 current
limit/threshold. Connecting SETI to ground asserts
FLAG.
Tabꢁe ±. SwLtch Truth Tabꢁe
MAX14523A
MAX14523B
MAX14523C
MAX14523AL
SWITCH STATUS
Use the following formula to calculate the current limit:
ON
0
ON
1
141400(V)
I (mA)
LIM
Off
On
R
(kΩ) =
− 2.48(kΩ)
SETI
1
0
_______________________________________________________________________________________
9
250mA to 1.5A, Adjustable
Current-Limit Switches
change is minimal. If the output is continuously shorted
Tabꢁe 2. ꢃurreꢄt ꢅLiLt/Threshlꢁꢂ Os.
ResLstlr Vaꢁues
to ground at the maximum supply voltage, the opera-
tion of the switches with the autoretry option does not
cause problems because the total power dissipated
during the short is scaled by the duty cycle:
R
(kꢁ) TYPICAL CURRENT LIMIT/THRESHOLD (mA)
SETI
91.78
121
1500
1145
632
466
333
250
0
V
×I
× t
IN(MAX) OUT(MAX) BLANK
221
P
=
(MAX)
t
+ t
RETRY BLANK
301
422
Attention must be given to the MAX14523C continuous
current-limit version when the power dissipation during
a fault condition can cause the device to reach the ther-
mal shutdown threshold.
563.12
ꢀ (Open)
Do not use an R
value smaller than 91.78kΩ.
SETI
Chip Information
Nlte: Connecting any capacitance larger than 20pF to
SETI can cause instability.
PROCESS: BiCMOS
IN Bypass Capacitor
Connect a minimum of 1µF capacitor from IN to GND to
limit the input voltage drop during momentary output
short-circuit conditions. Larger capacitor values further
reduce the voltage undershoot at the input.
Pin Configuration
N.C.
FLAG
SETI
OUT
1
2
3
4
8
7
6
5
GND
+
OUT Bypass Capacitor
For stable operation over the full temperature range
and over the full-programmable current-limit range, use
a 1µF ceramic capacitor from OUT to ground.
ON(ON)**
N.C.
MAX14523A
MAX14523AL
MAX14523B
MAX14523C
Excessive output capacitance can cause a false over-
current condition due to decreased dv/dt across the
capacitor. Calculate the maximum capacitive load
*EP
IN
(C
) value that can be connected to OUT using the
MAX
TDFN
3mm x 3mm
following formula:
I
(mA)× t
(ms)
LIM
BLANK(MIN)
*CONNECT EXPOSED PAD TO GND.
**( ) FOR THE MAX14523AL ONLY.
C
(µF) =
MAX
V (V)
IN
For example, for V = 3.3V, t
= 10ms, and I
=
IN
BLANK
LIM
300mA, C
equals 909µF.
MAX
Package Information
Layout and Thermal Dissipation
For the latest package outline information and land patterns,
go to www.iaxLi-Lc.cli/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.
To optimize the switch response time to output short-
circuit conditions, it is very important to keep all traces
as short as possible to reduce the effect of undesirable
parasitic inductance. Place input and output capacitors
as close as possible to the device (no more than 5mm).
IN and OUT must be connected with wide short traces
to the power bus. During normal operation, the power
dissipation is small and the package temperature
PAꢃKAGE
TYPE
PAꢃKAGE
ꢃꢀDE
ꢀUTꢅINE
Nꢀ.
ꢅAND
PATTERN Nꢀ.
8 TDFN-EP
T833+2
2±-1±37
91-1159
LB/MAX14523C
±1 ______________________________________________________________________________________
250mA to 1.5A, Adjustable
Current-Limit Switches
LB/MAX14523C
Revision History
REVISION REVISION
PAGES
DESCRIPTION
CHANGED
NUMBER
DATE
0
1
7/09
Initial release
Added the MAX14523BATA automotive-grade part to the Ordering Information
—
1/11
1
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11
© 2011 Maxim Integrated Products
Maxim is a registered trademark of Maxim Integrated Products, Inc.
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