Datasheet

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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 pro-

tection limits power dissipation and junction tempera-

tures.

The MAX890L’s maximum current limit is 1.2A. The cur-

rent limit through the switch is programmed with a

resistor from SET to ground. The quiescent supply cur-

rent 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

= +3.3V

0.1µA (typ) with Switch Off

♦♦

Thermal Shutdown

♦♦

FAULT Indicator Output

♦♦

0.09Ω (typ) On-Resistance

MAX890L

1.2A, Current-Limited, High-Side

P-Channel Switch with Thermal Shutdown

________________________________________________________________

Maxim Integrated Products

FAULT

OUT

SET

GND

MAX890L

TOP VIEW

Pin Configuration

MAX890L

1μF

0.1μF

100kΩ

IN OUTPUTOUTINPUT

IN OUT

FAULT ON

ON/OFF

SET

GND SET

Typical Operating Circuit

19-1146; Rev 4; 4/11

Ordering Information

To order this unit in tape and reel, add (T) to the end of the

part number.

Dice are tested at T

= +25°C.

Denotes a lead(Pb)-free/RoHS-compliant package.

/V denotes an automotive qualified part.

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

PART TEMP RANGE

PIN-

PACKAGE

CURRENT

LIMIT

MAX890LC/D 0°C to +70°C Dice** 1.2A

MAX890LESA+ -40°C to +85°C 8 SO 1.2A

MAX890LESA/V+ -40°C to +85°C 8 SO 1.2A

Summary of content (8 pages)

PAGE 1
9-1146; Rev 4; 4/11 1.2A, Current-Limited, High-Side P-Channel Switch with Thermal Shutdown 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.
PAGE 2
MAX890L 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 Switch Current ..................................1.5A Continuous Power Dissipation (TA = +70°C) SO (derate 5.88mW/°C above +70°C) ..............
PAGE 3
1.2A, Current-Limited, High-Side P-Channel Switch with Thermal Shutdown (VIN = +3V, TA = -40°C to +85°C, unless otherwise noted.) (Note 2) PARAMETER CONDITIONS Operating Voltage MIN 3.0 TYP MAX UNITS 5.5 V Quiescent Current VIN = 5V, ON = GND, IOUT = 0A 50 µA Off-Supply Current ON = IN, VIN = VOUT = 5.5V 2.2 µA Off-Switch Current ON = IN, VIN = 5.5V, VOUT = 0V 15 µA Undervoltage Lockout Rising edge, 1% hysteresis 2.9 V On-Resistance 2.0 VIN = 4.5V 130 VIN = 3.
PAGE 4
__________________________________________Typical Operating Characteristics (TA = +25°C, unless otherwise noted.) QUIESCENT CURRENT vs. TEMPERATURE 8 6 4 2 12 11 VIN = 3V 10 9 10 1 0.1 8 7 0 1 2 3 4 5 6 0.01 -40 -20 0 20 40 60 80 100 -40 -20 0 20 40 60 INPUT VOLTAGE (V) TEMPERATURE (°C) TEMPERATURE (°C) OFF-SWITCH CURRENT vs. TEMPERATURE NORMALIZED ON-RESISTANCE vs. TEMPERATURE IOUT/ISET RATIO vs. ILIMIT 1.2 NORMALIZED RON 100 10 1 1.1 1.0 0.
PAGE 5
1.2A, Current-Limited, High-Side P-Channel Switch with Thermal Shutdown OUTPUT OVERLOAD (SLOW LOOP RESPONSE) OUTPUT SHORT-CIRCUIT (FAST LOOP RESPONSE) MAX890 toc10 A MAX890 toc11 5V A B 5V B 0A C C 0V, 0A 0V 2μs/div CIN = 100μF, COUT = 0.1μF A: VIN, 1V/div, AC-COUPLED 2μs/div CIN = 100μF, COUT = 0.
PAGE 6
1.2A, Current-Limited, High-Side P-Channel Switch with Thermal Shutdown MAX890L Pin Description PIN NAME 1, 2 IN Input. P-channel MOSFET source. Bypass IN with a 1μF capacitor to ground. FUNCTION 3 ON Active-Low Switch On Input. A logic low turns the switch on. 4 GND Ground 5 SET Set Current-Limit Input. A resistor from SET to ground sets the current limit for the switch. RSET = 1.38 x 103/ILIMIT, where ILIMIT is the desired current limit in amperes. 6, 7 OUT Switch Output.
PAGE 7
1.2A, Current-Limited, High-Side P-Channel Switch with Thermal Shutdown MAX890L Layout and Thermal-Dissipation Consideration SET RSET GND Figure 2. Setting the Current Limit Thermal Shutdown The MAX890L features thermal shutdown. The switch turns off when the junction temperature exceeds +135°C. Once the device cools by 10°C, the switch turns back on. If the fault short-circuit condition is not removed, the switch cycles on and off, resulting in a pulsed output.
PAGE 8
MAX890L 1.2A, Current-Limited, High-Side P-Channel Switch with Thermal Shutdown Revision History REVISION NUMBER REVISION DATE 4 4/11 DESCRIPTION Added the MAX890LESA/V+ part number to the Ordering Information, deleted the Chip Information section PAGES CHANGED 1, 7 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.