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AAT2689

SystemPower

TM

PMIC Solution for 12V Adapter Systems with 2-Output High Performance Step-Down Converters

General Description

The AAT2689 provides two independently regulated DC

outputs, consisting of a high voltage step-down (Buck)

regulator and a low input voltage low dropout (LDO) regu-

lator. The PMIC is optimized for low cost 12V adapter

inputs, making the device the ideal system-on-a-chip

power solution for consumer communications equipment.

Channel 1 is a step-down (Buck) regulator with an input

voltage range of 6V to 24V providing up to 2500mA out-

put current. 490kHz fixed switching frequency allows

small L/C filtering components. Channel 1 utilizes volt-

age mode control configured for optimum performance

across the entire output voltage and load range.

Channel 2 is a low-dropout (LDO) regulator providing up

to 600mA output current. The device provides extremely

low output noise, low quiescent current and excellent

transient response.

The controller includes integrated cycle-by-cycle over-

current protection, soft-start and over-temperature dis-

able features. Independent input and enable pins pro-

vide maximum design flexibility.

The AAT2689 is available in the Pb-free 3x4mm 16-pin

TDFN package. The rated operating temperature range is

-40擄C to 85擄C.

Features

鈥?2-Output Step-Down Converters:

鈻?/div>

Channel 1 (Buck): V

IN1

= 6V to 24V

鈥?V

OUT1

adjustable from 1.5V to 5.5V

鈥?I

OUT1

up to 2.5A

鈥?High Switching Frequency

鈥?Voltage Mode Control

鈥?PWM Fixed Frequency for Low-Ripple

鈻?/div>

Channel 2 (LDO): V

IN2

= 2.7V to 5.5V

鈥?I

OUT2

up to 600mA

鈥?1V Dropout Voltage at 600mA

鈥?High Accuracy 鹵1.5%

鈥?Small Solution Size

鈻?/div>

System on a Chip

鈻?/div>

Ultra-small External L/C

鈥?Shutdown Current <35渭A

鈥?Independent Enable Pins

鈥?Adjustable Over-Current Protection

鈥?Over-Temperature Protection

鈥?Internal Soft Start

鈥?3x4mm 16-Pin TDFN Low Profile Thermally Enhanced

Package

鈥?-40擄C to 85擄C Temperature Range

Applications

鈥?/div>

DSL and Cable Modems

Notebook Computers

Satellite Settop Box

Wireless LAN Systems

Typical Application

C4

0.1碌F

V

IN1

6.0V -24.0V

1

TDFN34-16

LX1

BST1

VL1

IN1

RS1

OS1

FB1

D2

L1 4.7碌H/5.3A

C8

330pF

R5

499

V

OUT1

3.3V/2.5A

D1

C6

2.2碌F

R2

2k

C7

220nF

R3

27.4k

C9,C11

2x22碌F

EN1

C1

220碌F

25V

+

C15

1碌F

25V

V

IN2

EN1

IN2

C5

2.2碌F

EN2

AAT2689

R1 24.3K

C2 470pF

C3 56pF

C10

2.2碌F

V

OUT2

1.8V/600mA

R4

6.04k

COMP1

OUT2

GND

2689.2008.06.1.0

www.analogictech.com

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