MAX8581ETB 데이터 시트보기 (PDF) - Maxim Integrated

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MAX8581ETB

2.5MHz/1.5MHz Step-Down Converters with 60mΩ Bypass in TDFN for CDMA PA Power

Maxim Integrated 

19-0593; Rev 1; 1/07

EVAALVUAAILTAIOBNLEKIT 2.5MHz/1.5MHz Step-Down Converters

with 60mΩ Bypass in TDFN for CDMA PA Power

General Description

The MAX8581/MAX8582 high-frequency step-down con-

verters are optimized for dynamically powering the power

amplifier (PA) in CDMA handsets. They integrate a high-

efficiency PWM step-down converter for medium- and

low-power transmission and a 60mΩ (typ) bypass mode

to power the PA directly from the battery during high-

power transmission. They use an analog input driven by

an external DAC to control the output voltage linearly for

continuous PA power adjustment. The MAX8581/

MAX8582 use an internal feedback network, and the

switching frequency is internally set to 2.5MHz and

1.5MHz, respectively.

Fast switching (up to 2.5MHz) and fast soft-start allow

the use of ceramic 2.2µF input and output capacitors

while maintaining low voltage ripple. The small 1.5µH to

3.3µH inductor size can be optimized for efficiency.

The MAX8581/MAX8582 are available in 10-pin, 3mm x

3mm TDFN packages (0.8mm max height).

Features

♦ 600mA Step-Down Converter

♦ 60mΩ (typ) Bypass Mode with Integrated FET

♦ Dynamically Adjustable Output from 0.4V to VIN

♦ 2.5MHz and 1.5MHz Switching Frequency

♦ Small LC Components: 1.5µH to 3.3µH and 2.2µF

♦ Up to 94% Efficiency

♦ Low Output Ripple at All Loads

♦ 2.7V to 5.5V Input

♦ 0.1µA Shutdown Mode

♦ Output Short-Circuit Protection

♦ Thermal Shutdown

♦ 10-Pin, 3mm x 3mm TDFN Packages

Applications

WCDMA/NCDMA Cell Phones

Wireless PDAs, Smartphones

Ordering Information

PART*

PIN-

PACKAGE

TOP

MARK

PKG

CODE

MAX8581ETB+

10 TDFN-EP** ACT

T1033-1

MAX8582ETB+

10 TDFN-EP** ACU

T1033-1

*All devices are specified in the -40°C to +85°C extended

temperature range.

**EP = Exposed pad.

+Denotes a lead-free package.

Typical Operating Circuit

INPUT

Li+ BATTERY

2.2µF

ON/OFF

ANALOG

CONTROL

OUTPUT

0.4V TO VBATT

IN

OUT

1.5µH OR 3.3µH

MAX8581 LX

MAX8582

GND

2.2µF

SHDN

REFIN

HP

FORCED BYPASS

TOP VIEW

Pin Configuration

10 9 8 7 6

MAX8581/

MAX8582

+1 2 3 4 5

________________________________________________________________ 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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