Maxim MAX890LC-D, MAX890LESA Datasheet
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 1A. 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 V
IN
= 3.3V
0.1µA (typ) with Switch Off
♦ Thermal Shutdown
♦ FAULT Indicator Output
♦ 0.09Ω (typ) On-Resistance
MAX890L
1A, Current-Limited, High-Side
P-Channel Switch with Thermal Shutdown
________________________________________________________________
Maxim Integrated Products
1
1
2
8
7
FAULT
OUT
OUT
SET
IN
IN
ON
GND
MAX890L
SO
TOP VIEW
3
4
6
5
Pin Configuration
MAX890L
1µF
0.1µF
100kΩ
IN OUTPUTOUTINPUT
IN OUT
FAULT ON
ON/OFF
R
SET
GND SET
Typical Operating Circuit
19-1146; Rev 2; 11/98
PART*
MAX890LC/D 0°C to +70°C
TEMP.
RANGE
PIN-
PACKAGE
Dice**
Ordering Information
*
To order this unit in tape and reel, add (-T) to the end of the part
number.
**
Dice are tested at TA= +25°C.
CURRENT
LIMIT
1A
1AMAX890LESA -40° C t o +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.
MAX890L
1A, Current-Limited, High-Side
P-Channel Switch with Thermal Shutdown
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VIN= 3V, TA= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +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 Switch Current ..................................1.5A
Continuous Power Dissipation (T
A
= +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, 10sec) ............................+300°C
ON = IN, V
IN
= V
OUT
= 5.5V
VIN= 5V
VIN= 3V, I
OUT
= 500mA
VIN= 5V, ON = GND, I
OUT
= 0
VIN= 5V, I
OUT
= 500mA
20% current overdrive, VCC= 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
I
OUT
= 500mA, V
OUT
> 1.6V
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
µs25Turn-Off Time
µs
185
Turn-On Time
120 200
µs2Fast-Current-Loop Response Time
µs5Slow-Current-Loop Response Time
µA0.05 1
FAULT Logic Output High Leakage Current
V0.4
FAULT Logic Output Low Voltage
µA0.5 3I
SET
Bias Current
µA0.01 1
ON Input Leakage
V
2.4
ON Input High Voltage
µA0.03 1Off-Supply Current
µA13 20
V2.7 5.5Operating Voltage
Quiescent Current
2.0
V0.8
ON Input Low Voltage
A/A970 1110 1300I
OUT
to I
SET
Current Ratio
A1Maximum Output Current Limit
µA0.04 15Off-Switch Current
V2.0 2.4 2.6Undervoltage Lockout
75 130
V1.178 1.240 1.302Current-Limit-Amplifier Threshold
UNITSMIN TYP MAXPARAMETER
VIN= 3.0V
mΩ
90 150
On-Resistance
Note 1: Tested with I
OUT
= 100mA and V
SET
raised until VIN- V
OUT
≥ 0.8V.
MAX890L
1A, Current-Limited, High-Side
P-Channel Switch with Thermal Shutdown
_______________________________________________________________________________________ 3
Note 2: Specifications to -40°C are guaranteed by design, not production tested.
ON = IN, VIN= V
OUT
= 5.5V
VIN= 5V
VIN= 5V, ON = GND, I
OUT
= 0
I
SINK
= 1mA, V
SET
= 1V
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
150
µs200
On-Resistance
Turn-On Time
V0.4
FAULT Logic Output Low Voltage
µA2.2Off-Supply Current
µA50
V2.9 5.5Operating Voltage
Quiescent Current
A/A925 1390I
OUT
to I
SET
Current Ratio
µA15Off-Switch Current
V2.0 2.9Undervoltage Lockout
130
V1.14 1.34Current-Limit-Amplifier Threshold
UNITSMIN TYP MAXPARAMETER
ELECTRICAL CHARACTERISTICS
(VIN= 3V, TA= -40°C to +85°C, unless otherwise noted.) (Note 2)
VIN= 5V µs120Turn-Off Time
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