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19-1153; Rev 0; 10/96
Dual, Current-Limited, High-Side P-Channel
Switches with Thermal Shutdown
_______________General Description
The MAX894L/MAX895L smart, dual, 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 dis-
sipation and junction temperature.
The MAX894L/MAX895L’s maximum current limits are
500mA and 250mA, respectively. The current limit
through the switches is programmed with resistors from
SET A/SET B to ground. When the switches are on, the
quiescent supply current is a low 16µA. When the
switches are off, the supply current decreases to 0.1µA.
The MAX894L/MAX895L are available in an 8-pin SO
package.
________________________Applications
PCMCIA Slots
Access Bus Slots
Portable Equipment
____________________________Features
o +2.7V to +5.5V Input Range
o Programmable Current Limits
o Low Supply Current:
16µA IQ at VIN = 3.3V
0.1µA with Switch Off
o Thermal Shutdown
______________Ordering Information
PART*
TEMP.
RANGE
PIN-
CURRENT
PACKAGE LIMIT
MAX894LC/D 0°C to +70°C Dice**
500mA
MAX894LESA -40°C to +85°C 8 SO
500mA
MAX895LC/D 0°C to +70°C Dice**
250mA
MAX895LESA -40°C to +85°C 8 SO
250mA
*To order these units in tape and reel, add (-T) to the end of the
part number.
**Dice are tested at TA = +25°C.
__________Typical Operating Circuit __________________Pin Configuration
OUTPUT A
0.1µF
OUTPUT B
0.1µF
RSET A
ON/OFF
OUT A
ONB
OUT B
SET A
MAX894L
MAX895L
IN
SET B
ONA GND
ON/OFF
INPUT
1µF
RSET B
TOP VIEW
OUT A 1
OUT B 2
SET A 3
ONA 4
MAX894L
MAX895L
SO
8 ONB
7 IN
6 SET B
5 GND
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800

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Dual, Current-Limited, High-Side P-Channel
Switches with Thermal Shutdown
ABSOLUTE MAXIMUM RATINGS
IN to GND ...................................................................-0.3V to 6V
ONA, ONB to GND .....................................................-0.3V to 6V
SET A, SET B, OUT A, OUT B to GND ........-0.3V to (VIN + 0.3V)
Maximum Continuous Switch Current
MAX894L ..........................................................................0.75A
MAX895L ........................................................................0.375A
Continuous Power Dissipation (TA = +70°C)
SO (derate 5.88mW/°C above +70°C) .......................471mW
Operating Temperature Range
MAX89_LESA .................................................-40°C to +85°C
Storage Temperature Range ...............................-65°C to+150°C
Lead Temperature (soldering, 10sec) ..............................+300°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.
ELECTRICAL CHARACTERISTICS
(VIN = 3V, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
Operating Voltage
Quiescent Current
Off-Supply Current
Off-Switch Current
Undervoltage Lockout
On-Resistance
Current-Limit-Amplifier Threshold
Maximum Output Current
IOUT to ISET Current Ratio
ONA, ONB Input Low Voltage
ONA, ONB Input High Voltage
ONA, ONB Input Leakage
ISETA, ISETB Bias Current
Slow-Current-Loop Response Time
Fast-Current-Loop Response Time
Turn-On Time
Turn-Off Time
CONDITION
VIN = 5V, ONA = ONB = GND, IOUT A = IOUT B = 0
ONA = ONB = IN, VIN = VOUT A = VOUT B = 5.5V
ONA = ONB = IN, VIN = 5.5V, VOUT A = VOUT B = 0
Rising edge, 1% hysteresis
VIN = 4.5V
MAX894L
MAX895L
VIN = 3.0V
MAX894L
MAX895L
VSET required to turn the switch off (Note 1)
MAX894L
MAX895L
VOUT = 1.6V to 2.8V
MAX894L, IOUT = 250mA
MAX895L, IOUT = 125mA
VIN = 2.7V to 5.5V
VIN = 2.7V to 3.6V
VIN = 4.5V to 5.5V
V ONA = V ONB = 5.5V
VSET A = 1.24V, ONA = 0, ONB = VIN, IOUT A = 0
VSET B = 1.24V, ONB = 0, ONA = VIN, IOUT B = 0
20% current overdrive, VCC = 5V
MIN
2.7
2.0
1.178
945
910
2.0
2.4
VIN = 5V, IOUT = 250mA (MAX894L), 125mA (MAX895L)
VIN = 3V, IOUT = 250mA (MAX894L), 125mA (MAX895L)
0.8
TYP
18
0.03
0.04
2.4
120
250
150
300
1.240
500
250
1085
1050
0.01
0.5
0.5
5
2
100
150
1.2
MAX
5.5
30
1
3
2.6
225
420
300
500
1.302
1270
1235
0.8
1
3
3
200
20
Note 1: Tested with IOUT = 50mA for the MAX894L and 25mA for the MAX895L, and VSET raised until VIN - VOUT 0.8V.
UNITS
V
µA
µA
µA
V
m
V
mA
A/A
V
V
µA
µA
µs
µs
µs
µs
2 _______________________________________________________________________________________

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Dual, Current-Limited, High-Side P-Channel
Switches with Thermal Shutdown
ELECTRICAL CHARACTERISTICS (Note 2)
(VIN = 3V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
Operating Voltage
Quiescent Current
Off-Supply Current
Off-Switch Current
Undervoltage Lockout
On-Resistance
Current-Limit-Amplifier Threshold
IOUT to ISET Current Ratio
CONDITION
VIN = 5V, ONA = ONB = GND, IOUT A = IOUT B = 0
ONA = ONB = IN, VIN = VOUT A = VOUT B = 5.5V
ONA = ONB = IN, VIN = 5.5V, VOUT A = VOUT B = 0
Rising edge, 1% hysteresis
VIN = 4.5V
MAX894L
MAX895L
VIN = 3.0V
MAX894L
MAX895L
VSET_ required to turn the switch off (Note 1)
VSET = 1.24V,
VOUT = 1.6V to 2.8V
MAX894L, IOUT = 250mA
MAX895L, IOUT = 125mA
MIN
3.0
2.0
1.14
910
880
TYP
MAX
5.5
50
2.2
8
2.9
250
420
300
500
1.34
1360
1315
UNITS
V
µA
µA
µA
V
m
V
A/A
Turn-On Time
VIN = 5V
200 µs
Turn-Off Time
Note 2: Specifications to -40°C are guaranteed by design, not production tested.
0.25
20 µs
_______________________________________________________________________________________ 3

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Dual, Current-Limited, High-Side P-Channel
Switches with Thermal Shutdown
__________________________________________Typical Operating Characteristics
(Typical Operating Circuit, TA = +25°C, unless otherwise noted.)
QUIESCENT CURRENT
vs. INPUT VOLTAGE
28
ONA = ONB = GND
24 IOUT A = IOUT B = 0
20
16
12
8
4
0
0
12
34
5
INPUT VOLTAGE (V)
6
OFF-SWITCH CURRENT
vs. TEMPERATURE
0.07
0.06
0.05
0.04
0.03
0.02
0.01
0
-40 -20
0 20 40 60 80 100
TEMPERATURE (°C)
NORMALIZED OUTPUT CURRENT
vs. OUTPUT VOLTAGE
1.4
VIN = 5V
1.2
1.0 ILIMIT
0.8
0.6
0.4
0.2
0
0
1 2 34 5
OUTPUT VOLTAGE (V)
6
QUIESCENT CURRENT
vs. TEMPERATURE
24
22
20
18 VIN = 5V
16 VIN = 3V
14
12
-40 -20
0 20 40 60
TEMPERATURE (°C)
80 100
NORMALIZED ON-RESISTANCE
vs. TEMPERATURE
1.3
IOUT = 1/2 ILIMIT
1.2
1.1
1.0
0.9
0.8
0.7
0.6
-40 -20
0 20 40 60 80 100
TEMPERATURE (°C)
TURN-ON TIME
vs. TEMPERATURE
260 ILOAD = ILIMIT
240
220
200
180
160 VIN = 3V
140
120
100 VIN = 5V
80
60
-40 -20
0 20 40 60 80
TEMPERATURE (°C)
100
OFF-SUPPLY CURRENT
vs. TEMPERATURE
0.07
0.06
0.05
0.04
0.03
0.02
0.01
0
-40 -20
0 20 40 60 80 100
TEMPERATURE (°C)
IOUT/ISET vs. ILIMIT
1600
1400
1200
1000
800
600
400
200
0
0 20 40 60 80 100 120 140
ILIMIT (%)
TURN-OFF TIME
vs. TEMPERATURE
7
ILOAD = ILIMIT
6
5 VIN = 5V
4
3 VIN = 3V
2
1
0
-40 -20
0 20 40 60 80 100
TEMPERATURE (°C)
4 _______________________________________________________________________________________

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Dual, Current-Limited, High-Side P-Channel
Switches with Thermal Shutdown
____________________________Typical Operating Characteristics (continued)
(Typical Operating Circuit, TA = +25°C, unless otherwise noted.)
CURRENT-LIMIT RESPONSE
(MAX894L, RL = 1)
CURRENT-LIMIT RESPONSE
(MAX894L, RL = 0.7)
A 5V
5V
A
B
C 0A
0V
2µs/div
CIN = 47µF, COUT = 0.1µF
A: VIN, 500mV/div, AC coupled
MAX894/895/896 TOC-9
B: IOUT, 2A/div
C: VOUT, 5V/div
B
0A
C 0V
LOAD-TRANSIENT RESPONSE
(MAX894L)
1µs/div
CIN = 47µF, COUT = 0.1µF
A: VIN, 500mV/div, AC coupled
MAX894/895/896 TOC-10
B: IOUT, 2A/div
C: VOUT, 5V/div
A
0A
B 0V
SWITCH TURN-ON TIME
A
2ms/div
MAX494/495/496 TOC-13
VIN = 5V
A: IOUT = 0 to 500mA, 0.2A/div
B: VOUT RIPPLE, 200mV/div, AC COUPLED
A
0V
SWITCH TURN-OFF TIME
B
20µs/div
VIN = 5V, IOUT = ILIMIT
A: VON, 2V/div
B: VOUT, 2V/div
MAX894/895/896 TOC-11
B
0V
VIN = 5V, IOUT = ILIMIT
A: VON, 2V/div
B: VOUT, 2V/div
2µs/div
MAX894/895/896 TOC-12
_______________________________________________________________________________________ 5