Rainbow-electronics MAX8884Z Uživatelský manuál stáhnout pdf

General Description

The MAX8884Y/MAX8884Z step-down converters with

dual low-dropout (LDO) linear regulators are intended to

power low-voltage microprocessors, DSPs, camera and

Wi-Fi modules, or other point of load applications in

portable devices. These ICs feature high efficiency with

small external component size. The step-down converter

output voltage is pin selectable between 1.2V and 1.8V,

and provides guaranteed output current of 700mA. The

2/4MHz hysteretic-PWM control scheme allows for tiny

external components and reduces no-load operating

current to 50μA. Two low quiescent current, low-noise

LDOs operate down to 2.7V supply voltage. Two switch-

ing frequency options are available—MAX8884Y (2MHz)

and MAX8884Z (4MHz)—allowing optimization for small-

est solution size or highest efficiency. Fast switching

allows the use of small ceramic 2.2μF input and output

capacitors while maintaining low ripple voltage. The

MAX8884Y/MAX8884Z have individual enables for each

output, maximizing flexibility.

The MAX8884Y/MAX8884Z are available in a 16-bump,

2mm x 2mm CSP package (0.7mm max height).

Applications

Cell Phones/Smartphones

PDA and Palmtop Computers

Portable MP3 and DVD Players

Digital Cameras, Camcorders

PCMCIA Cards

Handheld Instruments

Features

♦ Step-Down Converter

Pin-Selectable Output Voltage (1.2V/1.8V)

2MHz or 4MHz Switching Frequency

Low-Output Voltage Ripple

700mA Output Drive Capability

Simple Logic ON/OFF Control

Tiny External Components

♦ Low-Noise LDOs

2 x 300mA LDO

Pin-Selectable Output Voltage (LDO1)

Low 26µV

RMS

(typ) Output Noise

High 65dB (typ) PSRR

Simple Logic ON/OFF Control

♦ Low 0.1µA Shutdown Current

♦ 2.7V to 5.5V Supply Voltage Range

♦ Thermal Shutdown

♦ Tiny, 2mm x 2mm x 0.65mm CSP Package (4x4 Grid)

MAX8884Y/MAX8884Z

700mA DC-DC Step-Down Converters

with Dual 300mA LDO in 2mm x 2mm CSP

________________________________________________________________

Maxim Integrated Products

19-4418; Rev 0; 4/09

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.

Typical Application Circuit appears at end of data sheet.

AGND

PGND

REFBP

NC1

BUCK_EN

LDO2

LDO2_EN

MAX8884Y

MAX8884Z

SEL

IN1A

IN2

IN1B

LDO1_EN

LDO1

NC2

TOP VIEW

(BUMPS ON BOTTOM)

A1 A2 A3 A4

B1 B2 B3 B4

C1 C2 C3 C4

D1 D2 D3 D4

CSP

Pin Configuration

IN1A

2.2μH

AGND

BUCK_EN

LDO1_EN

LDO2_EN

IN2

BATT

2.7V TO 5.5V

BATT

2.7V TO 5.5V

BUCK ON/OFF

BUCK

1.2V/1.8V

REFBP

IN1B

LDO1 ON/OFF

LDO2 ON/OFF

LDO2

LDO1

LDO2

UP TO 300mA

LDO1

UP TO 300mA

PGND

SEL

2.2μF

BUCK/LDO1 VOLTAGE

SELECTION

MAX8884Y

MAX8884Z

Typical Operating Circuit

Ordering Information

PART PIN-PACKAGE

SWITCHING

FREQUENCY

MAX8884YEREKE+T 16 CSP 2MHz

MAX8884ZEREKE+T 16 CSP 4MHz

Note: All devices are specified over the -40°C to +85°C operat-

ing temperature range.

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

T = Tape and reel.

1 2 3 4 5 6 ... 14 15

MAX8884Y/MAX8884Z 1

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General DescriptionThe MAX8884Y/MAX8884Z step-down converters withdual low-dropout (LDO) linear regulators are intended topower low-voltage microproce

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MAX8884Y/MAX8884Z700mA DC-DC Step-Down Converterswith Dual 300mA LDO in 2mm x 2mm CSPMaxim cannot assume responsibility for use of any circuitry other

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MAX8884Y/MAX8884Z700mA DC-DC Step-Down Converterswith Dual 300mA LDO in 2mm x 2mm CSP_________________________________________________________________

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