General Description

The MAX4766 is a programmable current-limit switch

that uses a proprietary control topology to provide a

±10% accurate current limit. It operates from 2.25V to

4.5V input voltage.

The current limit is resistor settable from 0.075A to 1.5A

and features an adjustable soft-start function to control

the output-voltage ramp rate, thereby limiting the inrush

current. It also has an adjustable blanking time to

accommodate various capacitive loads.

If the load current is greater than the current-limit

threshold, the current limiter handles the overcurrent

situation in one of three ways depending on the option

selected. It enters an autoretry mode (MAX4766A),

latches off the switch (MAX4766B), or places the

device in a continuous current-limit mode (MAX4766C).

Additional safety features include thermal shutdown to

prevent overheating and reverse-current blocking to

prevent current from being driven back into the source.

The MAX4766 is available in a tiny 8-pin 3mm x 3mm

TDFN package and operates over the extended tem-

perature range of -40

°C to +85°C.

Applications

SDIO Ports

Notebook Computers

PDAs and Palmtop Devices

Cell Phones

Features

♦ ±10% Accurate Current Limit

♦ 0.075A to 1.5A Programmable Current Limit

♦ Inrush Current Protection

♦ Thermal Shutdown Protection

♦ Reverse-Current Protection

♦ Low Dropout Voltage

♦ Programmable Blanking Time

♦ Programmable Soft-Start Time

♦ FFLLA

AG

G Function (MAX4766B/MAX4766C)

♦ Tiny 8-Pin TDFN Package (3mm x 3mm)

♦ 2.25V to 4.5V Supply Range

0.075A to 1.5A, Programmable

Current-Limit Switch

________________________________________________________________ Maxim Integrated Products

1

Ordering Information/Selector Guide

2.25V TO 4.5V

IN

OUT

FLAG*

GND

ON

µP

MAX4766

SETB

SETS

SETI

*MAX4766B/C

Typical Operating Circuit

19-3458; Rev 0; 10/04

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

PART

TEMP RANGE

PIN-PACKAGE

TOP MARK

PKG CODE

SOFT-START/

BLANKING

OVERCURRENT

RESPONSE

MAX4766AETA

-40°C to +85°C

8 TDFN

AKV

T833-1

Programmable

Autoretry

MAX4766BETA

-40°C to +85°C

8 TDFN

AKW

T833-1

Programmable

Latch-Off

MAX4766CETA

-40°C to +85°C

8 TDFN

AKX

T833-1

Programmable

Continuous

SETS

IN

OUT

1

2

8

7

GND

ON

FLAG

SETI

SETB

TDFN

TOP VIEW

3

4

6

5

MAX4766

Pin Configuration