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MAX893L Datasheet

1.2A / Current-Limited / High-Side P-Channel Switch with Thermal Shutdown

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MAX893L pdf
19-1450; Rev 0; 7/99
1.2A, Current-Limited, High-Side
P-Channel Switch with Thermal Shutdown
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 pro-
tection limits power dissipation and junction tempera-
ture.
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 cur-
rent 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.
____________________________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 0.07On-Resistance
________________________Applications
USB Ports
USB Hubs
PCMCIA Slots
Access Bus Slots
Portable Equipment
PART
MAX893LESA
Ordering Information
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
8 SO
Typical Operating Circuit
Pin Configuration
INPUT
1µF
IN
IN MAX893L
100k
FAULT
GND
OUT
OUT
ON
SET
OUTPUT
0.1µF*
ON/OFF
RSET
*USB SPECIFICATIONS REQUIRE HIGHER CAPACITANCE.
TOP VIEW
IN 1
IN 2
ON 3
GND 4
MAX893L
8 FAULT
7 OUT
6 OUT
5 SET
SO
________________________________________________________________ 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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX893L Datasheet

1.2A / Current-Limited / High-Side P-Channel Switch with Thermal Shutdown

No Preview Available !

MAX893L pdf
1.2A, Current-Limited, High-Side
P-Channel Switch with Thermal Shutdown
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 Short-Circuit Switch Current .............2.0A
Continuous Power Dissipation (TA = +70°C)
SO (derate 5.88mW/°C above +70°C) .........................471mW
Operating Temperature Range
MAX893LESA ...................................................-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
CONDITIONS
Operating Voltage
Quiescent Current
Off-Supply Current
Off-Switch Current
Undervoltage Lockout
VIN = 5V, ON = GND, IOUT = 0
ON = IN, VIN = VOUT = 5.5V
ON = IN, VIN = 5.5V, VOUT = 0
Rising edge, 1% hysteresis
On-Resistance
Current-Limit-Amplifier Threshold
VIN = 4.5V
VIN = 3.0V
VSET required to turn the switch off (Note 1)
Maximum Programmable Continuous
Output Current Limit
Short-Circuit Current
IOUT to ISET Current Ratio
ON Input Voltage Low
ON Input Voltage High
ON Input Leakage Current
ISET Bias Current
FAULT Logic Output Voltage Low
FAULT Logic Output High Leakage Current
Slow Current-Loop Response Time
Fast Current-Loop Response Time
IOUT = 500mA, VOUT > 1.6V
VIN = 2.7V to 5.5V
VIN = 2.7V to 3.6V
VIN = 4.5V to 5.5V
V ON = 5.5V
VSET = 1.24V, IOUT = 0; VIN = VOUT
ISINK = 1mA, VSET = 1.4V
V FAULT = 5.5V, VSET = 1V
20% current overdrive, VIN = 5V
Turn-On Time
Turn-Off Time
VIN = 5V, IOUT = 500mA
VIN = 3V, IOUT = 500mA
VIN = 5V, IOUT = 500mA
MIN
2.7
2.0
1.178
920
2.0
2.4
2
TYP
13
0.03
0.04
2.4
70
88
1.240
1.2
1.8
1080
0.01
0.5
0.05
5
2
80
115
4
MAX
5.5
20
1
15
2.6
125
160
1.302
UNITS
V
µA
µA
µA
V
m
V
A
1250
0.8
A
A/A
V
V
1 µA
3 µA
0.4 V
1 µA
µs
µs
200
µs
µs
2 _______________________________________________________________________________________


Part Number MAX893L
Description 1.2A / Current-Limited / High-Side P-Channel Switch with Thermal Shutdown
Maker Maxim
Total Page 8 Pages
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