MAX8940EXKXY-T 데이터 시트보기 (PDF) - Maxim Integrated

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MAX8940EXKXY-T

Low-Noise, High PSRR, Low-Dropout, 120mA Linear Regulator

Maxim Integrated 

19-4662; Rev 0; 6/09

Low-Noise, High PSRR,

Low-Dropout, 120mA Linear Regulator

General Description

The MAX8940 low-noise, low-dropout (LDO) linear reg-

ulator is designed to deliver up to 120mA continuous

output current. This regulator achieves a low 120mV

dropout for 120mA load current. The MAX8940 uses an

advanced architecture to achieve low output voltage

noise of 25µVRMS and PSRR of 45dB at 100kHz.

The MAX8940 is preset to either 2.8V or 3.0V. Designed

with a p-channel MOSFET series pass transistor, the

MAX8940 maintain very low ground current (40µA).

The regulator is designed and optimized to work with low-

value, low-cost ceramic capacitors. The MAX8940

requires only 1µF (typ) of output capacitance for stability

with any load. When disabled, current consumption drops

to below 1µA.

Package is a 5-pin SC70.

Applications

Cellular and Cordless Phones

PDA and Palmtop Computers

Base Stations

Bluetooth Portable Radios and Accessories

Wireless LANs

Digital Cameras

Personal Stereos

Portable and Battery-Powered Equipment

Features

♦ Space-Saving SC70

♦ 25µVRMS Output Noise at 100Hz to 100kHz

Bandwidth

♦ 65dB PSRR at 10kHz

♦ 120mV Dropout at 120mA Load

♦ Stable with 1µF Ceramic Capacitor for Any Load

♦ Guaranteed 120mA Output

♦ Output Voltages: 2.8V or 3V

♦ Low 40µA Ground Current

♦ Excellent Load/Line Transient

♦ Overcurrent and Thermal Protection

Ordering Information

PART*

TEMP RANGE PIN-PACKAGE

MAX8940EXKxy-T

-40°C to +85°C 5 SC70

MAX8940EXKxy+T

-40°C to +85°C 5 SC70

*xy is the output voltage code (see Output Voltage Selector

Guide).

+Denotes a lead(Pb)-free/RoHS-compliant package.

Output Voltage Selector Guide

PART

MAX8940EXK28-T

MAX8940EXK30-T

VOUT (V)

2.8

3

TOP MARK

AUE

AUD

Pin Configuration

TOP VIEW

IN 1

5 OUT

GND 2 MAX8940

SHDN 3

4 BP

SC70

Typical Operating Circuit

INPUT

2V TO 6V

CIN = 1µF

ON

OFF

PRESET OUTPUT

2.8V OR 3.0V

IN

OUT

MAX8940

SHDN

GND

BP CBP = 10nF

COUT = 1µF

________________________________________________________________ Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

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