Maxim MAX891LEUA-T, MAX891LC-D, MAX892LEUA-T, MAX892C-D Datasheet
_______________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. Thermaloverload protection limits power dissipation and junction 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 High
♦ 2.7V to 5.5V Input Range
♦ Programmable Current Limit
♦ Low
13µA Quiescent Current at VIN= 3.3V,
0.1µA Switch Off
♦ Thermal Shutdown
♦
FAULT Indicator Output
♦ On-Resistances:
0.12Ω (MAX891L)
0.25Ω (MAX892L)
MAX891L/MAX892L
Current-Limited, High-Side
P-Channel Switches with Thermal Shutdown
________________________________________________________________
Maxim Integrated Products
1
1
2
8
7
OUT
OUT
FAULT
SET
IN
IN
ON
GND
MAX891L
MAX892L
µMAX
TOP VIEW
3
4
6
5
__________________Pin Configuration
1µF
0.1µF
100k
IN OUTPUTOUTINPUT
IN OUT
FAULT ON
ON/OFF
GND SET
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.
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
CURRENT
LIMIT
500mA
MAX892LC/D
0°C to +70°C Dice** 250mA
MAX891LEUA* -40°C to +85°C 8 µMAX 500mA
MAX892LEUA* -40°C to +85°C 8 µMAX 250mA
MAX891L/MAX892L
Current-Limited, High-Side
P-Channel Switches with Thermal Shutdown
2 _______________________________________________________________________________________
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, FAULT to GND.................................................... -0.3V to 6V
SET, OUT to GND........................................-0.3V to (V
IN
+ 0.3V)
Maximum Continuous Switch Current
MAX891L ..........................................................................0.75A
MAX892L ........................................................................0.375A
Continuous Power Dissipation (T
A
= +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= 5V
V
FAULT
= 5.5V, V
SET
= 1V
I
SINK
= 1mA, V
SET
= 1.4V
ON = IN, VIN= V
OUT
= 5.5V
V
SET
= 1.24V, I
OUT
= 0mA
VON= 5.5V
VIN= 5V, ON = GND, I
OUT
= 0mA
VIN= 4.5V to 5.5V
VIN= 2.7V to 3.6V
VIN= 2.7V to 5.5V
V
OUT
= 1.6V to 2.8V
MAX891L
V
SET
required to turn the switch off (Note 1)
MAX891L, I
OUT
= 250mA
VIN= 3.0V
MAX891L
MAX891L
VIN= 4.5V
MAX892L
MAX892L
CONDITIONS
µs5Slow-Current-Loop Response Time
µA0.05 1
MAX892L
FAULT Logic Output High Leakage
V0.4
MAX892L, I
OUT
= 125mA
FAULT Logic Output Low Voltage
µA0.5 3
I
OUT
= 250mA (MAX891L), or 125mA
(MAX892L)
I
SET
Bias Current
µA-1 0.01 1
ON Input Leakage
V
2.4
ON Input High Voltage
2.0
VIN= 5V
µs
V0.8
2
ON Input Low Voltage
A/A
Fast-Current-Loop Response Time
I
OUT
to I
SET
Current Ratio
VIN= 3V
840 965 1130
µs
100 200
Turn-On Time
840 965 1130
VIN= 5V µs
mA
0.8 2 20
Maximum Output Current
Turn-Off Time
250
µA0.02 1Off-Supply Current
µA13 20
V2.7 5.5Operating Voltage
Quiescent Current
500
V1.178 1.240 1.302Current-Limit-Amplifier Accuracy
mΩ
On-Resistance
300 500
120 225
250 420
150 300
UNITSMIN TYP MAXPARAMETER
mΩ
150
ON = IN, VIN= 5.5V, V
OUT
= 0V
µA0.02 3Off-Switch Current
Rising edge, 1% hysteresis V2.0 2.3 2.6Undervoltage Lockout
On-Resistance
MAX891L/MAX892L
Current-Limited, High-Side
P-Channel Switches with Thermal Shutdown
_______________________________________________________________________________________ 3
Note 1: Tested with I
OUT
= 50mA for the MAX891L, 25mA for the MAX892L, and V
SET
raised until VIN- V
OUT
≥ 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
I
SINK
= 1mA, V
SET
= 1.4V
ON = IN, VIN= V
OUT
= 5.5V
VIN= 5V, ON = GND, I
OUT
= 0mA
V
OUT
= 1.6V to 2.8V
V
SET
required to turn the switch off (Note 1)
MAX891L, I
OUT
= 250mA
VIN= 3.0V
MAX891L
MAX891L
VIN= 4.5V
MAX892L
CONDITIONS
µs0.25 20Turn-Off Time
µs200
MAX892L
Turn-On Time
V0.4
MAX892L, I
OUT
= 125mA
FAULT Logic Output Low Voltage
Rising edge, 1% hysteresis
ON = IN, VIN= 5.5V, V
OUT
= 0V
A/AI
OUT
to I
SET
Current Ratio
805 1210
805 1210
V2.0 2.9
µA2.2
Undervoltage Lockout
Off-Supply Current
µA50
µA
V3.0 5.5
8
Operating Voltage
Quiescent Current
Off-Switch Current
V1.14 1.34Current-Limit-Amplifier Accuracy
mΩ
On-Resistance
500
225
420
300
UNITSMIN TYP MAXPARAMETER
mΩ
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