AAT2689 Analogic Corporation, AAT2689 Datasheet

AAT2689

Manufacturer Part Number

AAT2689

Description

Manufacturer

Analogic Corporation

Datasheet

1.AAT2689.pdf (20 pages)

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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°C to 85°C.

Typical Application

SystemPower

2689.2008.06.1.0

220µF

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

25V

6.0V -24.0V

IN1

EN1

C15

1µF

25V

IN2

2.2µF

0.1µF

2.2µF

w w w . a n a l o g i c t e c h . c o m

VL1

IN1

EN1

IN2

EN2

BST1

AAT2689

TDFN34-16

COMP1

GND

OUT2

RS1

OS1

FB1

LX1

Features

• 2-Output Step-Down Converters:

• Small Solution Size

• Shutdown Current <35μA

• Independent Enable Pins

• Adjustable Over-Current Protection

• Over-Temperature Protection

• Internal Soft Start

• 3x4mm 16-Pin TDFN Low Profile Thermally Enhanced

• -40°C to 85°C Temperature Range

Applications

• DSL and Cable Modems

• Notebook Computers

• Satellite Settop Box

• Wireless LAN Systems

▪

Package

Channel 1 (Buck): V

• V

• I

• High Switching Frequency

• Voltage Mode Control

• PWM Fixed Frequency for Low-Ripple

Channel 2 (LDO): V

• I

• 1V Dropout Voltage at 600mA

• High Accuracy ±1.5%

System on a Chip

Ultra-small External L/C

C3 56pF

L1 4.7µH/5.3A

C10

2.2µF

R1 24.3K

OUT1

OUT2

OUT1

C2 470pF

220nF

up to 2.5A

up to 600mA

adjustable from 1.5V to 5.5V

1.8V/600mA

OUT2

330pF

499

PRODUCT DATASHEET

IN2

IN1

27.4k

6.04k

= 2.7V to 5.5V

= 6V to 24V

AAT2689

3.3V/2.5A

C9,C11

2x22µF

OUT1

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