Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPMICsPMIC - ELCs High side SSOP 16

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_______________General Description

The MAX869L P-channel load switch features an accu-

rate user-set current limit and low on-resistance. This

switch is designed to protect your power source from

shorts and surges by limiting current and preventing

the system supply from being pulled low. The input volt-

age range is 2.7V to 5.5V.

The MAX869L features a 2A, 45mΩ switch controlled

by a logic signal. Current-limit accuracy is ±21%, and

can be set from 400mA to 2.4A using a single resistor.

The device has a low 12µA quiescent supply current,

which reduces to 2µA max in shutdown. It features ther-

mal-shutdown protection and a logic-signal output pin

(FAULT) that signals when there is an overcurrent or

overtemperature condition.

For other devices in this family, consult the

Selector

Guide

________________________Applications

Universal Serial Bus (USB)

Notebook Computers

Personal Communicators

Palmtop Computers

Hand-Held Instruments

Portable Medical Instruments

____________________________Features

♦ Very Small Footprint (16-pin QSOP is the same

size as an 8-pin SO)

♦ Low Resistance: 45mΩ at 3V

♦ ±21%-Accurate, User-Set Current Limit

♦ 12µA (typ) Quiescent Current

♦ 0.01µA (typ) Shutdown Current

♦ 0.04µA (typ) Leakage to Output when Switch

is Off

♦ 2.7V to 5.5V Input Range

♦ Thermal Shutdown

♦

FAULT Output

MAX869L

2A, Current-Limited, High-Side

P-Channel Switch with Thermal Shutdown

________________________________________________________________

Maxim Integrated Products

_____________________Selector Guide

19-1278; Rev 0; 8/97

PART

MAX869LC/D

MAX869LEEE -40°C to +85°C

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

Dice*

16 QSOP

______________Ordering Information

__________Typical Operating Circuit

Dice are specified at T

= +25°C.

Pin Configuration appears at end of data sheet.

300

MAX892L

PART

150

MAX891L

MAX869L

AT 3V

(mΩ)

0.25

0.5

NOMINAL

CURRENT

(A)

Single

COUNT

8 µMAX

16 QSOP

PACKAGE

0.5 8 SODual150

MAX894L

0.25 8 SODual300

MAX895L

1 Single 8 SO90

MAX890L

MAX869L

FAULT

OUT

INPUT

2.7V TO 5.5V

1µF

0.1µF*

ON/OFF

SET

OUTPUT

UP TO 2A

100k

*FOR USB APPLICATIONS, C

= 1µF, C

OUT

= 120µF

SET

GND

Summary of content (8 pages)

PAGE 1
9-1278; Rev 0; 8/97 2A, Current-Limited, High-Side P-Channel Switch with Thermal Shutdown The MAX869L features a 2A, 45mΩ switch controlled by a logic signal. Current-limit accuracy is ±21%, and can be set from 400mA to 2.4A using a single resistor. The device has a low 12µA quiescent supply current, which reduces to 2µA max in shutdown. It features thermal-shutdown protection and a logic-signal output pin (FAULT) that signals when there is an overcurrent or overtemperature condition.
PAGE 2
MAX869L 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 .....................................3A Continuous Power Dissipation (TA = +70°C) QSOP (derate 8.3mW/°C above +70°C) ...........
PAGE 3
2A, Current-Limited, High-Side P-Channel Switch with Thermal Shutdown MAX869L ELECTRICAL CHARACTERISTICS (VIN = 3V, TA = -40°C to +85°C, unless otherwise noted.) (Note 3) PARAMETER CONDITIONS Operating Voltage MIN 2.9 TYP MAX UNITS 5.5 V Quiescent Current VIN = 5V, ON = GND, IOUT = 0A 25 µA Off-Supply Current ON = IN, VIN = VOUT = 5.5V 2.5 µA Off-Switch Current ON = IN, VIN = 5.5V, VOUT = 0V 30 µA Undervoltage Lockout Rising edge, 1% hysteresis 2.85 V On-Resistance 2.0 VIN = 4.
PAGE 4
__________________________________________Typical Operating Characteristics (TA = +25°C, unless otherwise noted.) 10 8 6 4 MAX869-02 13 12 VIN = 5V 11 VIN = 3V 10 2 9 0 8 20 VIN = VOUT = 5.5V IN = ON 18 OFF-SUPPLY CURRENT (nA) ON = GND IOUT = 0A QUIESCENT CURRENT (µA) QUIESCENT CURRENT (µA) 14 MAX869-01 14 12 OFF-SUPPLY CURRENT vs. TEMPERATURE QUIESCENT CURRENT vs. TEMPERATURE MAX869-03 QUIESCENT CURRENT vs.
PAGE 5
2A, Current-Limited, High-Side P-Channel Switch with Thermal Shutdown SLOW CURRENT-LIMIT RESPONSE A 0V MA869-10 MA869-09 FAST CURRENT-LIMIT RESPONSE A 0V B 0V B 0V C C 0A 0A D D 0V 0V 4µs/div CIN = 100µF, COUT = 0.1µF C: IOUT, 5A/div A: VFAULT, 5V/div D: VIN, 5V/div B: VOUT, 5V/div 2µs/div CIN = 100µF, COUT = 0.1µF C: IOUT, 5A/div A: VFAULT, 5V/div D: VIN, 5V/div B: VOUT, 5V/div MA869-11 LOAD-TRANSIENT RESPONSE A 0A 0V B 10ms/div VIN = 5V A: IOUT = 0mA TO 1A, 0.
PAGE 6
____________________________Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.) USB* CIRCUIT OUTPUT FALL TIME A 0V MA869-15 USB* CIRCUIT OUTPUT RISE TIME MA869-14 MAX869L 2A, Current-Limited, High-Side P-Channel Switch with Thermal Shutdown A 0V B B 0V 0V C C 0A 0A D D 0V 0V 500µs/div VIN = 5V, IOUT = 1A, CIN = 1µF, COUT = 120µF A: VON, 5V/div C: IOUT, 0.
PAGE 7
2A, Current-Limited, High-Side P-Channel Switch with Thermal Shutdown OUT MAX869L MAX869L P FAULT MAX869L P IN SET N REPLICA AMPLIFIER RSET ON GND P SET ON CURRENT-LIMIT AMPLIFIER 1.24V RSET Figure 2. Setting the Current Limit HOT ON CONTROL CIRCUITRY GND Figure 1. Functional Diagram Fault Indicator The MAX869L provides a fault output (FAULT). This open-drain output goes low when in current limit or when the die temperature exceeds 135°C.
PAGE 8
MAX869L 2A, Current-Limited, High-Side P-Channel Switch with Thermal Shutdown Under normal operating conditions, the package can dissipate and channel heat away. Calculate the maximum power as follows: P = I2LIMIT x RON where RON is the on-resistance of the switch. __________________Pin Configuration When the output is short circuited, the voltage drop across the switch equals the input supply. Hence, the power dissipated across the switch increases, as does the die temperature.