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1.2A, 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 supply against overload. Thermal-overload protection
limits power dissipation and junction temperatures.
The MAX890L’s maximum current limit is 1.2A. The current limit
through the switch is programmed with a resistor from SET to
ground. The quiescent supply current 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.
Applications
PCMCIA Slots
Access Bus Slots
Portable Equipment
Features
♦ +2.7V to +5.5V Input Range
♦ Programmable Current Limit
♦ Low Quiescent Current
10µA (typ) at VIN = +3.3V
0.1µA (typ) with Switch Off
♦ Thermal Shutdown
♦ FAULT Indicator Output
♦ 0.09Ω (typ) On-Resistance
ABSOLUTE MAXIMUM RATINGS
IN to GND
................................................................-0.3V
to +6V
ON, FAULT to GND
.................................................-0.3V to +6V
SET, OUT to GND ...................................... -0.3V to
(VIN + 0.3V)
Maximum Continuous Switch Current
..................................1.5A
Continuous Power Dissipation (TA = +70°C)
SO (derate 5.88mW/°C above +70°C) ..........................471mW
Operating Temperature Range
MAX890LESA
....................................................-40°C to +85°C
Storage Temperature Range ........................... -65°C to
+150°C
Lead Temperature (soldering, 10s) .
...............................+300°C
Soldering Temperature (reflow)
.......................................+260°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.
Typical Operating Circuit
Pin Configuration
