Datasheet > A4402_12

A4402_12

更新时间： 2022-05-19 03:16:06

品牌	Logo	应用领域
急速微 - ALLEGRO		稳压器
页数	文件大小	规格书
17页	328K
描述
The A4402 is a dual-output regulator, combining in a single package a constant on-time buck regulator and a linear regulator (LDO)âeach with adjustable output voltages.

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A4402_12 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

▪ Power-on reset output

▪ Adjustable buck and linear regulators

▪ Enable input

Description

The A4402 is a dual-output regulator, combining in a single

packageaconstanton-timebuckregulatorandalinearregulator

(LDO)—each with adjustable output voltages. It is ideal for

applications that require two regulated voltages, such as in

microcontroller- or DSP-based applications requiring core

and I/O voltage rails.

▪ 6 to 50 V supply voltage range

▪ Overcurrent protection

▪ Undervoltage lockout (UVLO)

▪ Thermal shutdown protection

The buck regulator output supplies the adjustable linear

regulator to reduce power dissipation and increase overall

efficiency. The switching regulator is capable of operating

above 2 MHz, allowing the use of small low value inductors

and capacitors while avoiding sensitive EMI frequency bands

such as AM radio in automotive applications.

Applications:

AUTOMOTIVE (“K” VERSION)

COMMERCIAL (“E” VERSION)

• Powersteeringcontrolunits • Photo and inkjet printers

• Transmission control units • Industrial controls

Protection features include undervoltage lockout and thermal

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

overcurrent protection.

• Lighting control units

• Infotainment

• Cluster

• Distributed power systems

• Networking applications

• Point-of-sale

The device has an integrated power-on reset with adjustable

delay to monitor LDO output voltage and provide a signal that

can be used to reset a DSP or microcontroller. It also includes

a watchdog circuit.

• Centerstack

• Security systems

• Other body control

Package: 16-pin TSSOP with exposed

thermal pad (suffix LP)

The A4402 is provided in a 16-pin TSSOP, with exposed pad

for enhanced thermal dissipation. It is lead (Pb) free, with

100% matte tin leadframe plating.

Not to scale

Typical Application

V_BAT

R_ton

750 kΩ

TON

VIN1

C_TSET

0.1 μF

TSET

Efficiency vs. Output Current

10 μF

BOOT

0.15 μF

μF

0.01

Switching Regulator Output

V_SW

C_POR

5 V

33 μH

POR

ISEN

3.3

0.33 μF

A4402

SENSE

4.7 μF

GND

31.6

V_OUT(V)

kΩ

V_O2

FB1

9.76 kΩ

20 kΩ

NPOR

VIN2

VO2

Linear Regulator Output

V_LIN

ENB

WDI

3.3 V

250 mA

200 400 600 800 1000 1200

1 μF

kΩ

4.7 kΩ

I_OUT(mA)

FB2

GND

5.62 kΩ

Data is for reference only. Efficiency data from circuit shown in left panel.

4402-DS, Rev. 9

12 3 4 5 6 7...17

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