MAX8561 查看數據表（PDF） - Maxim Integrated

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MAX8561

4MHz, 500mA Synchronous Step-Down DC-DC Converters in Thin SOT and TDFN

Maxim Integrated 

19-2954; Rev 2; 8/05

EVAALVUAAILTAIOBNLEKIT

4MHz, 500mA Synchronous Step-Down

DC-DC Converters in Thin SOT and TDFN

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 5-pin Thin SOT23 pack-

age. 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

Typical Operating Circuit

Features

♦ Up to 4MHz PWM Switching Frequency

♦ 500mA Guaranteed Output Current

♦ 40µA (typ) 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

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

0.8mm TDFN Packages

Ordering Information

PART

TEMP RANGE

MAX8560EZK-T -40°C to +85°C

MAX8560EZK+T -40°C to +85°C

MAX8561ETA-T -40°C to +85°C

MAX8561ETA+T -40°C to +85°C

MAX8562ETA-T -40°C to +85°C

MAX8562ETA+T -40°C to +85°C

+Denotes lead-free package.

PIN-PACKAGE

5 Thin SOT23-5

5 Thin SOT23-5

8 TDFN

8 TDFN

8 TDFN

8 TDFN

TOP

MARK

ADRX

ADRX

AHD

AHD

AHE

AHE

Pin Configurations

INPUT

2.7V TO 5.5V

CIN

2.2µF

IN

LX

GND MAX8560

FB

ON/OFF

SHDN

L

1µH

R1

CFF

R2

OUTPUT

0.6V TO 2.5V

UP TO 500mA

COUT

2.2µF

TOP VIEW

IN 1

5 LX

MAX8560

GND 2

SHDN 3

4 FB

Thin SOT23-5

8 7 65

MAX8561/

MAX8562

1 2 34

TDFN

3mm × 3mm × 0.8mm

A "+" sign will replace the first pin indicator

on lead-free packages.

________________________________________________________________ Maxim Integrated Products 1

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.

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