MAX890L Datasheet, PDF (1/8 Pages) Maxim Integrated Products – 1A, Current-Limited, High-Side P-Channel Switch with Thermal Shutdown

19-1146; Rev 2; 11/98
1A, Current-Limited, High-Side
P-Channel Switch with Thermal Shutdown
General Description
The MAX890L smart, low-voltage, P-channel, MOSFET
power switch is intended for high-side load-switching
applications. This switch operates with inputs from 2.7V
to 5.5V, making it ideal for both 3V and 5V systems.
Internal current-limiting circuitry protects the input sup-
ply against overload. Thermal-overload protection limits
power dissipation and junction temperatures.
The MAX890L’s maximum current limit is 1A. The cur-
rent limit through the switch is programmed with a
resistor from SET to ground. The quiescent supply cur-
rent is a low 10µA. When the switch is off, the supply
current decreases to 0.1µA.
The MAX890L is available in an 8-pin SO package.
____________________________Features
o 2.7V to 5.5V Input Range
o Programmable Current Limit
o Low Quiescent Current
10µA (typ) at V_IN = 3.3V
0.1µA (typ) with Switch Off
o Thermal Shutdown
o FAULT Indicator Output
o 0.09Ω (typ) On-Resistance
________________________Applications
PCMCIA Slots
Access Bus Slots
Portable Equipment
Ordering Information
PART*
MAX890LC/D
MAX890LESA
TEMP.
RANGE
0°C to +70°C
-40°C to +85°C
PIN-
PACKAGE
Dice**
8 SO
CURRENT
LIMIT
1A
1A
* To order this unit in tape and reel, add (-T) to the end of the part
number.
** Dice are tested at T_A = +25°C.
Typical Operating Circuit
Pin Configuration
INPUT
1µF
IN
OUT
IN _MAX890L OUT
100kΩ
FAULT
ON
GND
SET
OUTPUT
0.1µF
ON/OFF
R_SET
TOP VIEW
IN 1
IN 2
ON 3
GND 4
MAX890L
8 ^FAULT
7 ^OUT
6 OUT
5 SET
SO
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