AAT2783 Datasheet

IC型號：
AAT2783
PDF描述：
Triple Output PMIC: Dual Buck with Low-VIN LDO
文件大?。?/label>
1997.98KB
PDF頁數(shù)：
22頁
芯片廠家：
ANALOGICTECH

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PRODUCT DATASHEET

AAT2783

SystemPower

General Description

Triple Output PMIC: Dual Buck with Low-V

LDO

Features

鈥?/div>

Range Step-Down (Buck): 2.7V to 5.5V

Range Low Drop-Out (LDO): 1.5V to 5.5V

Output Voltage Range: 0.6V to V

Step-Down Output Current:

鈻?/div>

Channel 1: 1000mA

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Channel 2: 400mA

LDO Output Current:

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Channel 3: 400mA

High Efficiency with Low R

DS(ON)

Switches

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Step-Down up to 97%

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LDO Regulator up to 80%

Total Quiescient Current 135渭A

Shutdown Current: 1渭A

Step-Down Converters

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1.3MHz Switching Frequency

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Current Mode Control

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Cycle-by-Cycle Current Limit

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High Efficiency Light-Load Mode Operation

LDO Converter

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Ultra Low Noise with Bypass Capacitor

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Over-Current Protection

200渭s Internal Soft Start

Over-Temperature Protection

TDFN34-16 Low Profile Package

-40擄C to 85擄C Temperature Range

The AAT2783 provides three independently regulated

DC outputs: two step-down (Buck) regulators and a

single low input voltage, low drop-out (LDO) regulator.

The input voltage range for the step-down regulators is

2.7V to 5.5V, while the LDO regulator allows inputs from

1.5V to 5.5V. The low input voltage LDO regulator allows

high efficiency, step-down, low noise outputs. In addi-

tion, the LDO input may be connected to step-down

outputs 1 or 2.

The Channel 1 and 2 step-down regulators can deliver up

to 1000mA and 400mA output current, respectively.

Step-down output voltages are set with external resis-

tors. Switching frequency is set at 1.3MHz to ensure

small external filtering components. Current mode con-

trol assures fast transient response and stable operation

across the operating range. The Channel 3 LDO regulator

can deliver up to 400mA with -80dB power supply rejec-

tion ratio (PSRR) and 65渭V

RMS

output noise with an

optional bypass capacitor. The LDO output voltage is fac-

tory set with a default voltage of 1.20V. Independent

enable and input pins are provided. The device consumes

low quiescent current and provides high efficiency across

the load range for maximum life in battery systems.

The AAT2783 is available in the Pb-free, 16-pin TDFN34

package and is rated over the -40擄C to 85擄C operating

temperature range.

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Applications

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Cellular and SmartPhones

Microprocessor / DSP Core / IO Power

PDAs and Handheld Computers

Portable Media Players

Wireless Data Systems

Typical Application

2.7V 鈥?.5V

VP1

EN1

VIN

10渭F

0.1渭F

AGND

GND1

2.2渭H

VP2

EN2

FB2

59.0k

GND2

= V

OUT2

VIN3

EN3

2.2渭F

AGND

OUT3

BYP

0.01渭F

10渭F

GND2

OUT3

1.2V, 400mA

LX2

107k

OUT2

1.7V, 0.4A

FB1

59.0k

AAT2783

LX1

59.0k

10渭F

1.5渭H

OUT1

1.2V, 1.0A

4.7渭F

2783.2008.03.1.0

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