AAT1217ICA-3.3-T1 datasheet(7/13 Pages) ANALOGICTECH

Part #	AAT1217ICA-3.3-T1

Description	600mA, 1.2MHz, Micropower Synchronous Step-Up Converter

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Manufacturer	ANALOGICTECH [Advanced Analogic Technologies]

Direct Link	http://www.analogictech.com

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7 / 13 page

Functional Block Diagram

COUT

R1

R2

PWM

Logic

Shutdown

Control

+

–

Comp

–

EA

+

VOUT

GND

SHDN

FB

VOUT

Oscillator

1.2MHz

Antiringing

Control

Bandgap

1.23V

Start-Up

Oscillator

+

–

VOUT

GOOD

MUX

Current

Sense

Slope

Compensation

To VIN

2.3V

L1

VIN

SW

–

+

CIN

AAT1217

600mA, 1.2MHz, Micropower

Synchronous Step-Up Converter

1217.2007.07.1.0

7

Functional Description

TheAAT1217isasynchronousstep-upDC-DCcon-

verter. It utilizes internal MOSFET switches to

achieve high efficiency over the full load current

range. It operates at a fixed switching frequency of

1.2MHz, and uses the slope compensated current

mode pulse width modulation (PWM) architecture.

The device can operate with an input voltage below

1V; the typical start-up voltage is 0.85V.

Synchronous Rectification

TheAAT1217 integrates a synchronous rectifier to

improve efficiency as well as to eliminate the need

for an external Schottky diode. The synchronous

rectifier is used to reduce the conduction loss con-

tributed by the forward voltage of an external

Schottky diode. The synchronous rectifier is real-

ized by a P-channel MOSFET (PMOS) with gate

control circuitry that incorporates relatively compli-

cated timing concerns.An external Schottky diode

is required when the output voltage is greater than

4.5V.

Low Voltage Start-Up

The AAT1217 can start-up with supply voltages

down to 0.85V. During start-up, the internal low

voltage start-up circuitry controls the internal

NMOS switch. The AAT1217 leaves the start-up

mode once VOUT exceeds 2.3V. An internal com-

parator(VOUTGOOD)monitorstheoutputvoltage

and places the chip into normal operation once

VOUT exceeds 2.3V. TheAAT1217’s control circuit-

ry is biased by VIN during start-up and biased by

VOUTonceVOUTexceedsVIN. WhenVOUTexceeds

VIN, the AAT1217’s operation will be independent

of VIN.

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AAT1217ICA-3.3-T1 Datasheet(PDF) 7 Page - Advanced Analogic Technologies

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