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PRODUCT DATASHEET

AAT2688

SystemPower

TM

4.5A PMIC Solution for 12V Adapter Systems with 2-Output High Performance Step-Down Converters

General Description

The AAT2688 provides two independently regulated DC

outputs: a high voltage synchronous step-down (Buck)

regulator and a low input voltage step-down low dropout

(LDO) regulator. 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 regulator with an input voltage

range of 6.0V to 24V, providing up to 4.5A output cur-

rent. 490kHz fixed switching frequency allows small L/C

filtering components. Channel 1 utilizes voltage 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 low out-

put noise, low quiescent current, and excellent transient

response.

The step-down regulator includes integrated over-cur-

rent, soft-start and over-temperature protection. Inde-

pendent input and enable pins provide maximum design

flexibility.

The AAT2688 is available in the Pb-free 4mm x 5mm

24-pin TQFN package. The rated operating temperature

range is -40擄C to 85擄C.

Features

鈥?2-Output Step-Down Converters:

鈥?Channel 1 (Buck): V

IN1

= 6.0 to 24.0V

鈻?/div>

V

OUT1

Adjustable from 0.8V to 5.5V

鈻?/div>

I

OUT1

up to 4.5A

鈻?/div>

High Switching Frequency

鈻?/div>

Voltage Mode Control

鈻?/div>

High Accuracy 鹵1.5%

鈻?/div>

PWM Fixed Frequency for Low Ripple

鈥?Channel 2 (LDO): V

IN2

= 2.7V to 5.5V

鈻?/div>

I

OUT2

up to 600mA

鈻?/div>

1V Dropout Voltage at 600mA I

OUT

鈥?Small Solution Size

鈥?System on a Chip

鈥?Ultra-small External L/C

鈥?Shutdown Current <35渭A

鈥?Independent Enable Pins

鈥?Over-Current and Over-Temperature Protection

鈥?Internal Soft Start

鈥?4x5mm 24-Pin TQFN Low Profile Package

鈥?-40擄C to 85擄C Temperature Range

Applications

鈥?/div>

DSL and Cable Modems

Notebook Computers

Satellite Set-top Boxes

Wireless LAN Systems

Typical Application

L1 4.7渭H/5.3A

C3

0.1渭F

D1

BAS16

J1

V

IN1

6.0V -24.0V

2

1

V

OUT1

3.3V/4.5A

LX1

BST1

VL1

DL

Q1

R2

2K

RS1

OS1

IN1

FB1

COMP1

R1

3.92k

C5

2.2nF

C6

150pF

OUT2

C12

2.2渭F

V

OUT2

R4

1.96k

R5

150

C4

220nF

C10

2.2nF

R3

9.09k

C14

2.2渭F

C7

22渭F

C8

22渭F

C9

22渭F

AAT2688

EN1

V

IN2

+

C1

220渭F

25V

C13

1渭F

25V

C2

2.2渭F

IN2

EN2

GND

TQFN45-24

2688.2008.06.1.0

www.analogictech.com

1

現(xiàn)有數(shù)量
0現(xiàn)貨
價格
停產(chǎn)
系列
-
包裝
卷帶（TR）
產(chǎn)品狀態(tài)
停產(chǎn)
拓撲
降壓同步（1），線性（LDO）（1）
輸出數(shù)
2
頻率 - 開關(guān)
490kHz
電壓/電流 - 輸出 1
0.8V ~ 5.5V，4.5A
電壓/電流 - 輸出 2
1.8V，600mA
電壓/電流 - 輸出 3
-
帶 LED 驅(qū)動器
無
帶監(jiān)控器
無
帶定序器
無
電壓 - 供電
2.7V ~ 24V
工作溫度
-40°C ~ 85°C
安裝類型
表面貼裝型
封裝/外殼
24-WFQFN 裸露焊盤
供應(yīng)商器件封裝
24-TQFN（4x5）

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