MAX8649 Maxim Integrated Products, MAX8649 Datasheet

MAX8649

Manufacturer Part Number

MAX8649

Description

1.8A Step-Down Regulator

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX8649.pdf (31 pages)

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The MAX8649 high-efficiency DC-to-DC step-down

switching regulator delivers up to 1.8A of output current.

The device operates from a 2.5V to 5.5V input voltage

range, making it future proof for next-generation battery

technologies. The output voltage is I

from 0.75V to 1.38V. Fully differential remote sense

ensures precise DC regulation at the load. Total output

error is less than 2% over load, line, and temperature.

The MAX8649 operates at a 3.25MHz fixed frequency.

The high operating frequency minimizes the size of exter-

nal components. The switching frequency of the converter

can be synchronized to the master clock of the applica-

tion. When synchronizing to an external clock, the

MAX8649 measures the frequency of the external clock to

ensure that the clock is stable before changing the

switching frequency to the external clock frequency.

An on-board DAC allows adjustment of the output volt-

age in 10mV steps. The output voltage can be pro-

grammed directly through the I

preloading a set of on-board registers and using the

two VID logic signals to select the appropriate register.

Other features include internal soft-start control circuitry

to reduce inrush current, output overvoltage, overcur-

rent, and overtemperature protection.

19-4504; Rev 0; 9/09

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.

Cell Phones and Smartphones

PDAs and MP3 Players

1.8A Step-Down Regulator with Differential

SNS+

SNS-

IN1

________________________________________________________________ Maxim Integrated Products

WLP 0.5mm PITCH

AGND

(BUMPS ON BOTTOM

VID0

SDA

General Description

TOP VIEW

Pin Configuration

PGND

SCL

VID1

Remote Sense in 2mm x 2mm WLP

Applications

C interface, or by

C programmable

PGND

SYNC

IN2

o 1.8A Guaranteed Output Current

o I

o Operates from 2.5V to 5.5V Input Supply

o On-Chip FET and Synchronous Rectifier

o Fixed 3.25MHz PWM Switching Frequency

o Synchronizes to 13MHz, 19.2MHz, or 26MHz

o Small 1.0µH Inductor

o Initial Accuracy 0.5% at 1.25V Output

o 2% Output Accuracy Over Load, Line, and

o Power-Save Mode Increases Light Load Efficiency

o Overvoltage and Overcurrent Protection

o Thermal Shutdown Protection

o 400kHz I

o < 1µA Shutdown Current

o 16-Bump, 2mm x 2mm WLP Package

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

2.2μF

2.5V TO

0V TO

MAX8649EWE+T

4.0V

5.5V

Steps)

System Clock when Available

Temperature

C Programmable V

PART

0.1μF

11Ω

C Interface

Typical Operating Circuit

SCL

SDA

IN1

FSYNC

VID0

VID1

MAX8649

AGND

-40°C to +85°C

TEMP RANGE

Ordering Information

OUT

PGND

SNS+

SNS-

IN2

(750mV to 1.38V in 10mV

1μH

10μF

PIN-PACKAGE

16 Bump WLP

(0.5mm pitch)

Features

10μF

0.1μF

CPU

(0.75V TO

1.38V)

OUT

2.5V TO

5.5V

0.1μF

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