AAT1106ICB-0.6-T1 データシートの表示（PDF） - Skyworks Solutions

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AAT1106ICB-0.6-T1

600mA Step-Down Converter

Skyworks Solutions 

Functional Block Diagram

OSC

SLOPE

COMP

BLANKING

FB

5

0.6V +

EA

-

0.65V

V IN

-

COMP

+

+

OVDET

-

SQ

RQ

RS LATCH

PWM

LOGIC

EN

1

REF

0.6V

SHUTDOWN

+

ISENSE

COMP

-

DRV

+

IZERO

COMP

-

DATA SHEET

AAT1106

600mA Step-Down Converter

VIN

4

+

R

-

VIN

2.7 - 5.5V

LX

3

COUT

GND

2

•

V OUT

R1

•

R2

•

Functional Description

The AAT1106 is a high performance 600mA, 1.5MHz fixed

frequency monolithic switch-mode step-down converter

which uses a current mode architecture with an adaptive

slope compensation scheme. It minimizes external com-

ponent size and optimizes efficiency over the complete

load range. The adaptive slope compensation allows the

device to remain stable over a wider range of inductor

values so that smaller values (1μH to 4.7μH) with associ-

ated lower DCR can be used to achieve higher efficiency.

Apart from the small bypass input capacitor, only a small

L-C filter is required at the output. The AAT1106 can be

programmed with external feedback to any voltage,

ranging from 0.6V to the input voltage. It uses internal

MOSFETs to achieve high efficiency and can generate

very low output voltage by using an internal reference of

0.6V. At dropout, the converter duty cycle increases to

100% and the output voltage tracks the input voltage

minus the low RDS(ON) drop of the P-channel high-side

MOSFET. The input voltage range is 2.5V to 5.5V. The

converter efficiency has been optimized for all load condi-

tions, ranging from no load to 600mA at VIN = 3V. The

internal error amplifier and compensation provides excel-

lent transient response, load, and line regulation.

Current Mode PWM Control

Slope compensated current mode PWM control provides

stable switching and cycle-by-cycle current limit for

excellent load and line response and protection of the

internal main switch (P-channel MOSFET) and synchro-

nous rectifier (N-channel MOSFET). During normal

operation, the internal P-channel MOSFET is turned on

for a specified time to ramp the inductor current at each

rising edge of the internal oscillator, and is switched off

when the feedback voltage is above the 0.6V reference

voltage. The current comparator, ICOMP, limits the peak

inductor current. When the main switch is off, the syn-

chronous rectifier turns on immediately and stays on

until either the inductor current starts to reverse, as

indicated by the current reversal comparator, IZERO, or

the beginning of the next clock cycle.

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201970B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 15, 2013

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