Rainbow-electronics MAX8562 User Manual download pdf

General Description

The MAX8560/MAX8561/MAX8562 step-down DC-DC

converters are optimized for applications that prioritize

small size and high efficiency. They utilize a proprietary

hysteretic-PWM control scheme that switches with fixed

frequency and is adjustable up to 4MHz, allowing cus-

tomers to trade efficiency for smaller external compo-

nents. Output current is guaranteed up to 500mA, while

quiescent current is only 40µA (typ).

Internal synchronous rectification greatly improves effi-

ciency and eliminates the external Schottky diode

required in conventional step-down converters. Built-in

soft-start eliminates inrush current to reduce input

capacitor requirements. The MAX8561 features logic-

controlled output voltage, while the MAX8562 drives an

external bypass FET.

The MAX8560 is available in a 6-pin SOT23 package.

The MAX8561/MAX8562 are available in space-saving

8-pin 3mm x 3mm Thin DFN packages.

Applications

Microprocessor/DSP Core Supplies

Cellular and Smart Phones

CDMA/RF Power-Amplifier Supplies

PDAs, DSC, and MP3 Players

Features

♦ Up to 4MHz PWM Switching Frequency

♦ 500mA Guaranteed Output Current

♦ 40µA Typical Quiescent Current

♦ Adjustable Output Voltage from 0.6V to 2.5V

♦ Logic-Controlled Output Voltage (MAX8561)

♦ Drives External Bypass FET (MAX8562)

♦ ±1.5% Initial Accuracy

♦ Soft-Start Eliminates Inrush Current

♦ Fast Voltage-Positioning Transient Response

♦ Internal Synchronous Rectifier

♦ 2.7V to 5.5V Input

♦ 0.1µA Logic-Controlled Shutdown

♦ Thermal Shutdown

♦ Tiny SOT23 or Space-Saving 3mm x 3mm Thin

DFN Packages

MAX8560/MAX8561/MAX8562

4MHz, 500mA Synchronous Step-Down

DC-DC Converters in SOT and TDFN

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

GND

SHDNON/OFF

OUTPUT

0.6V TO 2.5V

UP TO 500mA

INPUT

2.7V TO 5.5V

1µH

OUT

2.2µF

MAX8560

PGND

Typical Operating Circuit

19-2954; Rev 0; 7/03

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.

EVALUATION KIT

AVAILABLE

PART TEMP RANGE PIN-PACKAGE

TOP

MARK

MAX8560EUT* -40°C to +85°C 6 SOT23-6 ABRY

MAX8561ETA -40°C to +85°C 8 TDFN AHD

MAX8562ETA -40°C to +85°C 8 TDFN AHE

GND

FBSHDN

16LXIN

MAX8560

SOT23-6

TOP VIEW

TDFN

3mm × 3mm × 0.8mm

5 PGND

ODO

ODI

SHDN

GND

PGND

MAX8561/

MAX8562

Pin Configurations

*Future product—contact factory for availability.

1 2 3 4 5 6 ... 11 12

Summary of Contents

Page 1 - MAX8560/MAX8561/MAX8562

General DescriptionThe MAX8560/MAX8561/MAX8562 step-down DC-DCconverters are optimized for applications that prioritizesmall size and high efficiency.

Page 2

MAX8560/MAX8561/MAX85624MHz, 500mA Synchronous Step-Down DC-DC Converters in SOT and TDFN10 __________________________________________________________

Page 3