MAXIM MAX893L User Manual
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.
________________________Applications
USB Ports
USB Hubs
PCMCIA Slots
Access Bus Slots
Portable Equipment
____________________________Features
♦ +2.7V to +5.5V Input Range
♦ Programmable Current Limit
0.2A to 1.2A Range
±20% Accuracy
♦ 1.2A Continuous Load Current
♦ 1.8A Short-Circuit Current
♦ Low Quiescent Current
13µA at V
IN
= 3.3V
0.1µA with Switch Off
♦ Thermal Shutdown
♦ FAULT Indicator Output
♦ 0.07Ω On-Resistance
MAX893L
1.2A, Current-Limited, High-Side
P-Channel Switch with Thermal Shutdown
________________________________________________________________
Maxim Integrated Products
1
Pin Configuration
MAX893L
1µF
*USB SPECIFICATIONS REQUIRE HIGHER CAPACITANCE.
0.1µF
*
100k
IN OUTPUTOUTINPUT
IN OUT
FAULT ON
ON/OFF
R
SET
GND SET
Typical Operating Circuit
PART TEMP. RANGE PIN-PACKAGE
Ordering Information
MAX893LESA -40°C to +85°C 8 SO
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.
19-1450; Rev 0; 7/99
TOP VIEW
IN
1
IN
2
MAX893L
ON
3
GND
4
SO
FAULT
8
OUT
7
OUT
6
SET
5
MAX893L
1.2A, Current-Limited, High-Side
P-Channel Switch with Thermal Shutdown
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
IN
= 3V, TA= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°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.
IN to GND ................................................................-0.3V to +6V
ON, FAULT to GND .................................................-0.3V to +6V
SET, OUT to GND ...................................... -0.3V to (V
IN
+ 0.3V)
Maximum Continuous Short-Circuit Switch Current .............2.0A
Continuous Power Dissipation (T
A
= +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
ON = IN, V
IN
= V
OUT
= 5.5V
VIN= 5V, I
OUT
= 500mA
VIN= 3V, I
OUT
= 500mA
VIN= 5V, ON = GND, I
OUT
= 0
VIN= 5V, I
OUT
= 500mA
20% current overdrive, VIN= 5V
V
FAULT
= 5.5V, V
SET
= 1V
VIN= 2.7V to 3.6V
VIN= 2.7V to 5.5V
I
SINK
= 1mA, V
SET
= 1.4V
V
SET
= 1.24V, I
OUT
= 0; VIN= V
OUT
ON = IN, VIN= 5.5V, V
OUT
= 0
Rising edge, 1% hysteresis
VIN= 4.5V
VON= 5.5V
V
SET
required to turn the switch off (Note 1)
VIN= 4.5V to 5.5V
CONDITIONS
µs24Turn-Off Time
µs
115
Turn-On Time
80 200
µs2Fast Current-Loop Response Time
µs5Slow Current-Loop Response Time
µA0.05 1
FAULT Logic Output High Leakage Current
V0.4
FAULT Logic Output Voltage Low
µA0.5 3I
SET
Bias Current
µA0.01 1
ON Input Leakage Current
V
2.4
ON Input Voltage High
µA0.03 1Off-Supply Current
µA13 20
V2.7 5.5Operating Voltage
Quiescent Current
2.0
V0.8
ON Input Voltage Low
A1.8Short-Circuit Current
A1.2
Maximum Programmable Continuous
Output Current Limit
µA0.04 15Off-Switch Current
V2.0 2.4 2.6Undervoltage Lockout
70 125
V1.178 1.240 1.302Current-Limit-Amplifier Threshold
UNITSMIN TYP MAXPARAMETER
VIN= 3.0V
mΩ
88 160
On-Resistance
I
OUT
= 500mA, V
OUT
> 1.6V A/A920 1080 1250I
OUT
to I
SET
Current Ratio
MAX893L
1.2A, Current-Limited, High-Side
P-Channel Switch with Thermal Shutdown
_______________________________________________________________________________________ 3
ON = IN, VIN= V
OUT
= 5.5V
VIN= 5V, I
OUT
= 500mA
VIN= 5V, ON = GND, I
OUT
= 0
I
SINK
= 1mA, V
SET
= 1.4V
I
OUT
= 500mA, V
OUT
> 1.6V
ON = IN, VIN= 5.5V, V
OUT
= 0
Rising edge, 1% hysteresis
VIN= 4.5V
V
SET
required to turn the switch off (Note 1)
CONDITIONS
VIN= 3.0V
mΩ
160
µs200
On-Resistance
Turn-On Time
V0.4
FAULT Logic Output Voltage Low
µA2.2Off-Supply Current
µA30
V3.0 5.5Operating Voltage
Quiescent Current
A/A865 1300I
OUT
to I
SET
Current Ratio
µA15Off-Switch Current
V2.0 2.9Undervoltage Lockout
125
V1.14 1.34Current-Limit-Amplifier Threshold
UNITSMIN TYP MAXPARAMETER
ELECTRICAL CHARACTERISTICS
(V
IN
= 3V, TA= -40°C to +85°C, unless otherwise noted.) (Note 2)
Note 1: Tested with I
OUT
= 100mA and V
SET
raised until VIN- V
OUT
≥ 0.8V.
Note 2: Specifications to -40°C are guaranteed by design, not production tested.
VIN= 5V, I
OUT
= 500mA µs120Turn-Off Time
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