MAX1771ESAT Maxim Integrated Products, MAX1771ESAT Datasheet

MAX1771ESAT

Manufacturer Part Number

MAX1771ESAT

Description

SOP8

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX1771CSAT.pdf (16 pages)

Specifications of MAX1771ESAT

Date_code

10+

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The MAX1771 step-up switching controller provides

90% efficiency over a 30mA to 2A load. A unique cur-

rent-limited pulse-frequency-modulation (PFM) control

scheme gives this device the benefits of pulse-width-

modulation (PWM) converters (high efficiency at heavy

loads), while using less than 110µA of supply current (vs.

2mA to 10mA for PWM converters).

This controller uses miniature external components. Its

high switching frequency (up to 300kHz) allows sur-

face-mount magnetics of 5mm height and 9mm diame-

ter. It accepts input voltages from 2V to 16.5V. The

output voltage is preset at 12V, or can be adjusted

using two resistors.

The MAX1771 optimizes efficiency at low input voltages

and reduces noise by using a single 100mV current-limit

threshold under all load conditions. A family of similar

devices, the MAX770–MAX773, trades some full-load

efficiency for greater current-limit accuracy; they provide

a 200mV current limit at full load, and switch to 100mV

for light loads.

The MAX1771 drives an external N-channel MOSFET

switch, allowing it to power loads up to 24W. If less power

is required, use the MAX756/MAX757 or MAX761/MAX762

step-up switching regulators with on-board MOSFETs. An

evaluation kit is available.

19-0263; Rev 2; 3/02

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.

2V TO V

INPUT

Positive LCD-Bias Generators

Flash Memory Programmers

High-Power RF Power-Amplifier Supply

Palmtops/Hand-Held Terminals

Battery-Powered Applications

Portable Communicators

ON/OFF

OUT

Typical Operating Circuit

SHDN

REF

________________________________________________________________ Maxim Integrated Products

MAX1771

FB AGND GND

General Description

EXT

V+

12V or Adjustable, High-Efficiency,

Low I

Applications

OUTPUT

12V

, Step-Up DC-DC Controller

o 90% Efficiency for 30mA to 2A Load Currents

o Up to 24W Output Power

o 110µA (max) Supply Current

o 5µA (max) Shutdown Current

o 2V to 16.5V Input Range

o Preset 12V or Adjustable Output Voltage

o Current-Limited PFM Control Scheme

o Up to 300kHz Switching Frequency

o Evaluation Kit Available

* Contact factory for dice specifications.

** Contact factory for availability and processing to MIL-STD-883B.

MAX1771CPA

MAX1771CSA

MAX1771C/D

MAX1771EPA

MAX1771ESA

MAX1771MJA

TOP VIEW

PART

SHDN

EXT

V+

-40°C to +85°C

-55°C to +125°C

TEMP RANGE

0°C to +70°C

Ordering Information

MAX1771

DIP/SO

Pin Configuration

GND

AGND

REF

8 Plastic DIP

8 SO

Dice*

8 Plastic DIP

8 SO

8 CERDIP**

PIN-PACKAGE

Features

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