A4403

更新时间： 2024-11-07 06:35:07

品牌	Logo	应用领域
急速微 - ALLEGRO		转换器
页数	文件大小	规格书
15页	335K
描述
Valley Current Mode Control Buck Converter

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A4403 数据手册

A4403

Valley Current Mode Control Buck Converter

Features and Benefits

Description

▪ Extremely fast load-transient response with minimal

output voltage delta

The A4403 is a buck converter that uses valley current-mode

control.Thiscontrolschemeallowsveryshortswitchon-times

to be achieved, making it ideal for applications that require

high switching frequencies combined with high input voltages

and low output voltages.

▪ Achieves high step-down ratios with on-times < 50 ns

▪ User-configurable on-time, achieving switching

frequencies up to 2 MHz

▪ Minimal external components required

▪ Optimized for low value filter capacitors and inductors

▪ Wide input voltage range: 9 to 46 V

▪ Output Current: 3 A

▪ Low standby current <100 μA

▪ Supplied in thermally-enhanced QFN package

Low cost is accomplished through high switching frequencies

of up to 2 MHz, allowing smaller and lower value inductors

and capacitors. In addition, minimal external components are

required through high levels of integration. Optimal drive

circuits are utilized to minimize switching losses.

Theswitchingfrequencyismaintainedconstant,astheon-time

is modulated by the input voltage. This feed-forward control

ensures excellent line correction. The on-time is set by an

external resistor pulled-up to the input supply.

Applications:

▪ Printers, scanners

▪ Cable, DSL modems/routers ▪ High power LED supply

▪ Set top box

▪ Network and telecom

▪ Industrial control

▪ Distributed power systems

▪ Battery chargers

▪ GPS/Infotainment

When power is initially applied and the device is enabled, a

user-configurablesoft-startfunctionoccurstominimizeinrush

currentandtopreventoutputovershoot.Internalhousekeeping

and bootstrap supplies are provided which only require the

additionofonesmallceramiccapacitor.Atop-offchargepump

is also provide to ensure correct operation at light loads.

Package 16-contact QFN (suffix EU):

Internaldiagnosticsprovidecomprehensiveprotectionagainst

overcurrents, input undervoltages, and overtemperatures.

The device package is a 16-contact, 4 mm × 4 mm, 0.75 mm

nominal overall height QFN, with exposed pad for enhanced

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

leadframe plating.

4 mm × 4 mm × 0.75 mm

Typical Application Diagram

V_IN

9 to 46 V

BOOT

V_OUT

5.0 V

3 A

22 nF

VIN

6.3 μH

2.2 μF

100 V

Efficiency versus Output Current

100 kΩ

_IN= 42 V

A4403

90.00

85.00

80.00

75.00

70.00

65.00

60.00

TON

DIS

5 V

10 μF

6.3 V

10 μF

6.3 V

ISEN

3.3 V

3.92 kΩ

50 mΩ

SGND

47 nF

750 Ω

GND

Output Current (A)

All capacitors are X5R or X7R ceramic

Resistors R3 and R4 should be surface mount, low inductance type, rated at 250 mW at 70°C

4403-DS, Rev. 1

12 3 4 5 6 7...15

中文翻译

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与A4403相关器件

型号	品牌	获取价格	描述	数据表
A4403_V	ALLEGRO	获取价格	Valley Current Mode Control Buck Converter
A4403GEU-T	ALLEGRO	获取价格	Valley Current Mode Control Buck Converter
A4403GEUTR-T	ALLEGRO	获取价格	Valley Current Mode Control Buck Converter
A4405	ALLEGRO	获取价格	The A4405 is an automotive power management IC that uses a high frequency constant on-time
A4406	ALLEGRO	获取价格	The A4406 is an automotive power management IC that uses a high frequency constant on-time
A4407	ALLEGRO	获取价格	The A4407 is an automotive power management IC that uses a 2.2 MHz constant on-time (COT)
A4408	ALLEGRO	获取价格	PWM frequency can be synchronized to external clock
A4408KLVTR-T	ALLEGRO	获取价格	PWM frequency can be synchronized to external clock
A4409	ALLEGRO	获取价格	Buck or buck-boost pre-regulator
A4409KLPTR-T	ALLEGRO	获取价格	Buck or buck-boost pre-regulator

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