Datasheet > A4402_1

A4402_1

更新时间： 2022-12-17 00:26:09

品牌	Logo	应用领域
急速微 - ALLEGRO		转换器稳压器
页数	文件大小	规格书
15页	371K
描述
Constant On-Time Buck Converter with Integrated Linear Regulator

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A4402_1 数据手册

A4402

Constant On-Time Buck Converter

with Integrated Linear Regulator

Features and Benefits

▪ 2 MHz switching frequency

▪ Adjustable soft start timer

▪ Watchdog input

Description

The A4402 is a power management IC that combines a 2%

constant on-time buck regulator and a 2% linear regulator.

Ideal for applications that require two regulated voltages. The

buck regulator output supplies the adjustable linear regulator

to reduce power dissipation and increase overall efficiency.

▪ Power-on reset output

▪ Adjustable 2% buck regulator

▪ Adjustable 2% linear regulator

▪ Enable input

▪ 6 to 50 V supply voltage range

▪ Overcurrent protection

Theswitchingregulatoriscapableofoperatingabove2 MHz.A

greater than 2 MHz switching frequency enables the customer

to select low value inductors and capacitors while avoiding

EMI.

▪ Undervoltage lockout (UVLO)

▪ Thermal shutdown protection

Protection features include undervoltage lockout and thermal

shutdown. In case of a shorted load, each regulator features

overcurrent protection. The A4402 also features a power-on

reset with adjustable delay for the microprocessor output.

Applications:

▪ Photo and inkjet printers

▪ Industrial controls

▪ Distributed power systems

▪ Network applications

The A4402 is provided in a 16-pin, ≤1.20 mm nominal

overall height TSSOP, with exposed pad for enhanced thermal

dissipation. It is lead (Pb) free, with 100% matte tin leadframe

plating.

Package: 16-pin TSSOP with exposed

thermal pad (suffix LP)

Not to scale

Typical Application

V_BAT

R_ton

750 kΩ

TON

VIN1

C_TSET

0.1 μF

10 μF

TSET

POR

BOOT

0.15 μF

μF

0.01

Switching Regulator Output

V_SW

C_POR

5 V

33 μH

ISEN

0.33 μF

A4402

SENSE

4.7 μF

GND

31.6

kΩ

V_O2

FB1

9.76 kΩ

20 kΩ

NPOR

VIN2

VO2

Linear Regulator Output

V_LIN

ENB

WDI

3.3 V

300 mA

1 μF

kΩ

4.7 kΩ

FB2

GND

5.62 kΩ

4402-DS, Rev. 2

12 3 4 5 6 7...15

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