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MAX892LEUA+TMAIXMN/a4000avaiCurrent-Limited, High-Side P-Channel Switches with Thermal Shutdown
MAX891LEUAMAXIMN/a1972avaiCurrent-Limited, High-Side P-Channel Switches with Thermal Shutdown
MAX891LEUAMAXN/a109avaiCurrent-Limited, High-Side P-Channel Switches with Thermal Shutdown
MAX891LEUAMAXIN/a26avaiCurrent-Limited, High-Side P-Channel Switches with Thermal Shutdown
MAX891LEUAMAXINN/a57avaiCurrent-Limited, High-Side P-Channel Switches with Thermal Shutdown
MAX891LEUAMAXIM ?N/a67avaiCurrent-Limited, High-Side P-Channel Switches with Thermal Shutdown
MAX891LEUA+ |MAX891LEUAMAXIMN/a10400avaiCurrent-Limited, High-Side P-Channel Switches with Thermal Shutdown
MAX891LEUA+T |MAX891LEUATMAXIMN/a559avaiCurrent-Limited, High-Side P-Channel Switches with Thermal Shutdown
MAX892LEUAMAXN/a1178avaiCurrent-Limited, High-Side P-Channel Switches with Thermal Shutdown
MAX892LEUAMAXIMN/a22671avaiCurrent-Limited, High-Side P-Channel Switches with Thermal Shutdown
MAX892LEUAMAXIM ?N/a80avaiCurrent-Limited, High-Side P-Channel Switches with Thermal Shutdown
MAX892L-EUA |MAX892LEUAMAXINN/a27130avaiCurrent-Limited, High-Side P-Channel Switches with Thermal Shutdown
MAX892LEUA+ |MAX892LEUAMAXIMN/a1145avaiCurrent-Limited, High-Side P-Channel Switches with Thermal Shutdown


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MAX892LEUA+ ,Current-Limited, High-Side P-Channel Switches with Thermal ShutdownGeneral Description ________
MAX892LEUA+T ,Current-Limited, High-Side P-Channel Switches with Thermal ShutdownGeneral Description ________
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MAX891LEUA-MAX891LEUA+-MAX891LEUA+T-MAX892LEUA-MAX892L-EUA-MAX892LEUA+-MAX892LEUA+T
Current-Limited, High-Side P-Channel Switches with Thermal Shutdown
_______________General Description
The MAX891L/MAX892L smart, low-voltage, P-channel,
MOSFET power switches are intended for high-side
load-switching applications. These switches operate
with inputs from 2.7V to 5.5V, making them ideal for
both 3V and 5V systems. Internal current-limiting circuitry
protects the input supply against overload. Thermal-
overload protection limits power dissipation and junc-
tion temperatures.
The MAX891L/MAX892L’s maximum current limits are
500mA and 250mA, respectively. The current limit
through the switch is programmed with a resistor from
SET to ground. When the switch is on, the quiescent
supply current is a low 13μA. When the switch is off, the
quiescent current decreases to 0.1μA.
The MAX891L/MAX892L are available in 8-pin μMAX
packages.
________________________Applications

PCMCIA Slots
Access Bus Slots
Portable Equipment
____________________________Features
Ultra-Small μMAX Package—Only 1.11mm High2.7V to 5.5V Input RangeProgrammable Current LimitLow 13μAQuiescent Current at VIN= 3.3V,
0.1μA Switch Off
Thermal ShutdownFAULTIndicator OutputOn-Resistances:
0.12Ω(MAX891L)
0.25Ω(MAX892L)
Current-Limited, High-Side
P-Channel Switches with Thermal Shutdown

OUT
OUT
FAULT
SET
GND
MAX891L
MAX892LMAX
TOP VIEW
__________________Pin Configuration
F
0.1mF
100kOUTPUTOUTINPUTOUT
FAULTONON/OFF
GNDSET
MAX891L
MAX892L
__________Typical Operating Circuit

19-1223; Rev 0; 4/97
PART
MAX891LC/D
0°C to +70°C
TEMP.
RANGE
PIN-
PACKAGE

Dice**
______________Ordering Information
To order these units in tape and reel, add (-T) to the end of the
part number.Dice are tested at TA= +25°C.
CURRENT
LIMIT

500mA
MAX892LC/D
0°C to +70°CDice**250mA
MAX891LEUA*-40°C to +85°C8 μMAX500mA
MAX892LEUA*-40°C to +85°C8 μMAX250mA
Current-Limited, High-Side
P-Channel Switches with Thermal Shutdown
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS

(VIN= 3V, TA= 0°C to +85°C,unless otherwise noted. Typical values are at TA= +25°C.)
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.
IN to GND ..................................................................-0.3V to 6V
ON, FAULTto GND....................................................-0.3V to 6V
SET, OUT to GND........................................-0.3V to (VIN+ 0.3V)
Maximum Continuous Switch Current
MAX891L ..........................................................................0.75A
MAX892L ........................................................................0.375A
Continuous Power Dissipation (TA= +70°C)
μMAX (derate 4.1mW/°C above +70°C) .......................330mW
Operating Temperature Range
MAX891LEUA/MAX892LEUA............................-40°C to +85°C
Storage Temperature Range ............................-65°C to +150°C
Lead Temperature (soldering, 10sec) ...........................+300°C
20% current overdrive, VIN= 5VFAULT= 5.5V, VSET= 1V
ISINK= 1mA, VSET= 1.4V= IN, VIN= VOUT= 5.5V
VSET= 1.24V, IOUT= 0mAON= 5.5V
VIN= 5V, ON= GND, IOUT= 0mA
VIN= 4.5V to 5.5V
VIN= 2.7V to 3.6V
VIN= 2.7V to 5.5V
VOUT= 1.6V to 2.8V
MAX891L
VSETrequired to turn the switch off (Note 1)
MAX891L, IOUT= 250mA
VIN= 3.0V
MAX891L
MAX891L
VIN= 4.5VMAX892L
MAX892L
CONDITIONS
5Slow-Current-Loop Response Time0.051
MAX892L
FAULTLogic Output High Leakage 0.4
MAX892L, IOUT= 125mA
FAULTLogic Output Low Voltage0.53
IOUT= 250mA (MAX891L), or 125mA
(MAX892L)
ISETBias Current-10.011ONInput Leakage2.4ONInput High Voltage2.0
VIN= 5V0.8Input Low Voltage
A/A
Fast-Current-Loop Response Time
IOUTto ISETCurrent Ratio
VIN= 3V
8409651130100200Turn-On Time
VIN= 5Vμs
Maximum Output Current
Turn-Off Time
2500.021Off-Supply Current13202.75.5Operating Voltage
Quiescent Current
5001.1781.2401.302Current-Limit-Amplifier Accuracy
On-Resistance
UNITSMINTYPMAXPARAMETER
150= IN, VIN= 5.5V, VOUT= 0VμA0.023Off-Switch Current
Rising edge, 1% hysteresisV2.02.32.6Undervoltage Lockout
On-Resistance
Current-Limited, High-Side
P-Channel Switches with Thermal Shutdown
Note 1: Tested with IOUT
= 50mA for the MAX891L, 25mA for the MAX892L, and VSETraised until VIN- VOUT‡0.8V.
Note 2:
Parameters to -40°C are guaranteed by design, not production tested.
ELECTRICAL CHARACTERISTICS

(VIN= 3V, TA= -40°C to +85°C,unless otherwise noted.) (Note 2)
VIN= 5V
VIN= 5V
ISINK= 1mA, VSET= 1.4V= IN, VIN= VOUT= 5.5V
VIN= 5V, ON= GND, IOUT= 0mA
VOUT= 1.6V to 2.8V
VSETrequired to turn the switch off (Note 1)
MAX891L, IOUT= 250mA
VIN= 3.0V
MAX891L
MAX891L
VIN= 4.5VMAX892L
CONDITIONS
0.2520Turn-Off Time200
MAX892L
Turn-On Time0.4
MAX892L, IOUT= 125mA
FAULTLogic Output Low Voltage
Rising edge, 1% hysteresis= IN, VIN= 5.5V, VOUT= 0V
A/AIOUTto ISETCurrent Ratio8051210
Undervoltage Lockout
Off-Supply Current503.05.5
Operating Voltage
Quiescent Current
Off-Switch Current1.141.34Current-Limit-Amplifier Accuracy
On-Resistance
UNITSMINTYPMAXPARAMETER
Current-Limited, High-Side
P-Channel Switches with Thermal Shutdown

OFF-SWITCH LEAKAGE CURRENT
vs. TEMPERATURE
AX980-04
TEMPERATURE (°C)
(m6080
NORMALIZED ON-RESISTANCE
vs. TEMPERATURE
AX980-05
TEMPERATURE (°C)6080
ILOAD = 1/2ILIM208060140
IOUT/ISET RATIO
vs. ILIMIT

AX981/2/3-06
ILIMIT (%)
T/IS
T R100120
NORMALIZED OUTPUT CURRENT
vs. OUTPUT VOLTAGE
AX890-06A
OUTPUT VOLTAGE (V)123456
ILIMIT
VIN = 5V
TURN-ON TIME
vs. TEMPERATURE
AX981/2/3-07
TEMPERATURE (°C)
(m180
ILOAD = ILIM
VIN = 3V
VIN = 5V
TURN-OFF TIME
vs. TEMPERATURE
AX981/2/3-08
TEMPERATURE (°C)
F (m
ILOAD = ILIM
VIN = 3V
VIN = 5V
__________________________________________Typical Operating Characteristics
(Typical Operating Circuit, TA = +25°C, unless otherwise noted.)
QUIESCENT CURRENT
vs. INPUT VOLTAGE

MAX981/2/3-01
INPUT VOLTAGE (V)
(m123456
QUIESCENT CURRENT
vs. TEMPERATURE
MAX981/2/3-02
TEMPERATURE (°C)
(m6080VIN = 3V
VIN = 5V
OFF-SUPPLY CURRENT
vs. TEMPERATURE
MAX980-03
TEMPERATURE (°C)
(m6080
Current-Limited, High-Side
P-Channel Switches with Thermal Shutdown

CIN = 47µF, COUT = 0.1µF
A: VIN, 500mV/div, AC COUPLED
CURRENT-LIMIT RESPONSE
(MAX891L, RL = 0.8W)
5V0A
2µs/div
B: IOUT, 2A/div
C: VOUT, 5V/div
CIN = 47µF, COUT = 0.1µF
A: VIN, 500mV/div, AC COUPLED
CURRENT-LIMIT RESPONSE
(MAX891L, RL = 0.5W)
5V
1µs/div
B: IOUT, 2A/div
C: VOUT, 5V/div
SWITCH TURN-ON TIME

20µs/div
VIN = 5V, IOUT = ILIM
A: VON, 2V/div
B: VOUT, 2V/div
SWITCH TURN-OFF TIME

2µs/div
VIN = 5V, IOUT = ILIM
A: VON, 2V/div
B: VOUT, 2V/div
VIN = 5V
A: ILOAD, 0.1A/div
B: VON, 5V/div
C: VOUT, 5V/div
D: VFAULT, 5V/div
SWITCH TIMING CHARACTERISTICS

50µs/div
____________________________Typical Operating Characteristics (continued)

(Typical Operating Circuit, TA = +25°C, unless otherwise noted.)
Current-Limited, High-Side
P-Channel Switches with Thermal Shutdown
______________________________________________________________Pin Description

Fault-Indicator Output. This open-drain output goes low when in current limit or when the die temperature
exceeds +135°C. FAULT6
Switch Output. P-channel MOSFET drain. Bypass OUT with a 0.1μF capacitor to ground.OUT7, 8
Set Current-Limit Input. A resistor from SET to ground sets the current limit for the switch. See Setting the
Current Limitsection.SET5
GroundGND4
PIN

Active-Low Switch On Input. A logic low turns the switch on.ON3
Input. P-channel MOSFET source. Bypass IN with a 1μF capacitor to ground.IN1, 2
FUNCTIONNAME
_______________Detailed Description

The MAX891L/MAX892L P-channel MOSFET power
switches limit output current to a user-programmed
level. When the output current is increased beyond
the set current level, the current is also increased
through the replica switch (IOUT/965) and through
RSET(Figure 1).The current-limit error amplifier com-
pares the voltage across RSETto the internal 1.24V ref-
erence and regulates the current back to the lesser of
the programmed current limit (ILIMIT) or the maximum
current limit (IMAX).
These switches are not bidirectional; therefore, the
input voltage must be higher than the output voltage.
Setting the Current Limit

The MAX891L/MAX892L feature internal current-limit-
ingcircuitry with maximum programmable values
(IMAX) of 500mA and 250mA, respectively. For best
performance, set the current limit (ILIMIT) between
0.2IMAX≤ILIMIT≤IMAX. This current limit remains in
effect throughout the input supply-voltage range.
Program the current limit with a resistor (RSET) from
SET to ground (Figure 2) as follows:
ISET= ILIMIT/ IRATIO
RSET= 1.240 / ISET
where ILIMITis the desired current limit, and IRATIOis
the IOUTto ISETcurrent ratio (965).
Short-Circuit Protection

The MAX891L/MAX892L are short-circuit-protected
switches. In the event of an output short circuit or cur-
rent-overload condition, the current through the switch is
limited by the internal current-limiting error amplifier to
1.5 x ILIMIT. When the fault condition is removed, the
replica error amplifier sets the current limit back to
ILIMIT.
For a high DVDS/Dt during an output short-circuit condi-
tion, the switch turns off and disconnects the input sup-
ply from the output. The current-limiting amplifier then
slowly turns the switch on with the output current limited
to 1.5x ILIMIT. When the fault condition is removed, the
current limit is set back to ILIMIT. Refer to the Current-
Limit Response graphs in the Typical Operating
Characteristics.
MAX891L
MAX892L
RSET
SET
OUT
GND
1.24V
FAULTCURRENT-LIMIT
AMPLIFIER
REPLICA
AMPLIFIER
HOT
CONTROL
CIRCUITRY
Figure 1. Functional Diagram
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