19-1450; Rev 0; 7/99
1.2A, Current-Limited, High-Side
P-Channel Switch with Thermal Shutdown
____________________________Features
o +2.7V to +5.5V Input Range
o Programmable Current Limit
0.2A to 1.2A Range
±20% Accuracy
o 1.2A Continuous Load Current
o 1.8A Short-Circuit Current
o Low Quiescent Current
13µA at VIN = 3.3V
0.1µA with Switch Off
o Thermal Shutdown
o FAULT Indicator Output
o 0.07Ω On-Resistance
________________________Applications
USB Ports
Ordering Information
PART
TEMP. RANGE
PIN-PACKAGE
MAX893LESA
USB Hubs
-40°C to +85°C
8 SO
PCMCIA Slots
Access Bus Slots
Portable Equipment
Typical Operating Circuit
Pin Configuration
TOP VIEW
INPUT
IN
OUT
OUTPUT
0.1µF*
IN
MAX893L
OUT
8 FAULT
IN 1
100k
FAULT
ON
GND
SET
ON/OFF
IN 2
MAX893L
7 OUT
ON 3
6 OUT
GND 4
1µF
5 SET
RSET
SO
*USB SPECIFICATIONS REQUIRE HIGHER CAPACITANCE.
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
MAX893L
General Description
The MAX893L 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 temperature.
The MAX893L’s maximum programmed current limit is
1.2A. The typical short-circuit current is 1.5 times the
programmed current; therefore, a 1.2A programmed
limit will result in a 1.8A short-circuit current limit. The
current limit through the switch is programmed with a
resistor from SET to ground. The quiescent supply current is a low 13µA. When the switch is off, the supply
current decreases to 0.1µA.
The MAX893L is available in an 8-pin SO package.
