MAX77271 datasheet(1/20 Pages) MAXIM

Part #	MAX77271

Description	Multimode PA Step-Down Converter with Linear Bypass Mode

PDF	20 Pages

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Manufacturer	MAXIM [Maxim Integrated Products]

Direct Link	https://www.maximintegrated.com/en.html

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MAX77271

Multimode PA Step-Down Converter

with Linear Bypass Mode

19-6508; Rev 0; 12/12

Ordering Information appears at end of data sheet.

General Description

The MAX77271 step-down converter is optimized for

powering the power amplifier (PA) in multistandard hand-

sets such as LTE, WCDMA, TD-SCDMA, GSM, and

EDGE. The device integrates a high-efficiency PWM step-

down converter for medium- and low-power transmission

with an 85mΩ (typ) low dropout (LDO) bypass regulator,

in parallel with the step-down converter, enabling high-

power transmission.

The IC uses an analog input driven by an external DAC to

control the output voltage linearly for continuous PA power

adjustment. The bypass LDO powers the PA directly from

the battery during high-power transmission or in case of

insufficient headroom between the input and programmed

output. The bypass LDO is enabled when the output volt-

age is greater than 0.65V. In the case where the output

current exceeds the step-down converter current limit,

the bypass LDO provides supplementary current to the

output, ensuring a stable output voltage. The bypass LDO

also provides a smooth transition between step-down

regulation and operation in dropout.

The IC is available in a 9-bump, 1.6mm x 1.6mm WLP

package (0.69mm max height).

Applications

● LTE, WCDMA, GSM, and EDGE

Cell Phones/Smartphones

Features

● PA Step-Down Converter

• 7µs (typ) Settling Time for 0.7V to 3.4V Output

Voltage Change

• Dynamic Output Voltage Setting from 0.5V to VIN

• 85mΩ PFET and 100% Duty Cycle for Low

Dropout

• 3MHz Switching Frequency

• Low Output Voltage Ripple

• 2% Output Voltage Accuracy Over Load, Line,

and Temperature

• Tiny External Components

● 2.5A Output Current Capability

● Simple Logic On/Off Control

● Low 0.1µA Shutdown Current

● 2.7V to 5.5V Supply Voltage Range

● Thermal Overload Protection

● 1.6mm x 1.6mm WLP Package (0.69mm max Height)

● Slot-to-Slot Average Power Tracking for LTE,

TD-SCDMA, and WCDMA Standards

Typical Operating Circuit

IN2

OUT

1µF

BATTERY

INPUT

2.7V TO

5.5V

IN1

4.7µF

2.2µH

4.7µF

OUTPUT

0.5V TO

VBATT

UP TO

2.5A

REFIN

1000pF

ANALOG

CONTROL

0.2V TO

1.7V

EN

ON

OFF

2G

MODE

AGND

PGND

LX

3G

STEP-DOWN

LOGIC

BYPASS LDO

MAX77271

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