Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPMICsPMIC - ELCs High side SOIC 8

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.

________________________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

= 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

FAULT

OUT

SET

GND

MAX893L

TOP VIEW

Pin Configuration

MAX893L

1µF

*USB SPECIFICATIONS REQUIRE HIGHER CAPACITANCE.

0.1µF

100k

IN OUTPUTOUTINPUT

IN OUT

FAULT ON

ON/OFF

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

Summary of content (8 pages)

PAGE 1
9-1450; Rev 0; 7/99 1.2A, Current-Limited, High-Side P-Channel Switch with Thermal Shutdown ____________________________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 VIN = 3.3V 0.1µA with Switch Off ♦ Thermal Shutdown ♦ FAULT Indicator Output ♦ 0.07Ω On-Resistance ________________________Applications USB Ports USB Hubs Ordering Information PART TEMP.
PAGE 2
MAX893L 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) .....................
PAGE 3
1.2A, Current-Limited, High-Side P-Channel Switch with Thermal Shutdown MAX893L ELECTRICAL CHARACTERISTICS (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 = 0 30 µA Off-Supply Current ON = IN, VIN = VOUT = 5.5V 2.2 µA Off-Switch Current ON = IN, VIN = 5.5V, VOUT = 0 15 µA Undervoltage Lockout Rising edge, 1% hysteresis 2.9 V On-Resistance 2.0 VIN = 4.
PAGE 4
__________________________________________Typical Operating Characteristics (TA = +25°C, unless otherwise noted.) QUIESCENT CURRENT vs. INPUT VOLTAGE QUIESCENT CURRENT vs. TEMPERATURE 13 8 6 4 VIN = 3V 12 11 10 1 0.1 0.01 9 2 0 8 1 2 3 4 5 6 0.001 -40 -20 0 20 40 60 80 -40 100 -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 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) A MAX893L toc11 MAX893L toc10 OUTPUT SHORT CIRCUIT (FAST-LOOP RESPONSE) A C C 0V VOUT 0V B 0A B IOUT 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 MAX893L Pin Description PIN NAME FUNCTION 1, 2 IN Input. P-channel MOSFET source. Bypass IN with a 1µF capacitor to ground. 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 = 1.34 · 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 OUT IN MAX893L INPUT VOLTAGE +5V VOUT MAX893L 100k SET RSET BLANKED SIGNAL TO µP GND Figure 2. Setting the Current Limit R 100k C 0.1µF MAX893L ON/OFF GND FAULT SET RSET Figure 3. Fault-Blanking Circuit Thermal Shutdown Output Capacitor The MAX893L features thermal shutdown. The switch turns off when the junction temperature exceeds +165°C. Once the device cools by 10°C, the switch turns back on.
PAGE 8
________________________________________________________Package Information SOICN.EPS MAX893L 1.2A, Current-Limited, High-Side P-Channel Switch with Thermal Shutdown Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.