Datasheet > A8437

A8437

更新时间： 2024-11-02 12:24:03

品牌	Logo	应用领域
急速微 - ALLEGRO		闪光灯移动电话
页数	文件大小	规格书
21页	635K
描述
Mobile Phone Xenon Photoflash Capacitor Charger

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中文翻译

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A8437 数据手册

A8437

Mobile Phone Xenon Photoflash Capacitor Charger

with IGBT Driver

Features and Benefits

Description

TheAllegro^®A8437 Xenon photoflash charger IC is designed

tomeettheneedsofultra-lowpower,smallformfactorcameras,

particularly camera-phones.

▪ Low quiescent current draw (0.1 μA in shutdown mode)

▪ Primary-side output voltage sensing; no resistor divider

required

The charge current time is adjustable by setting the charge

current limit from 0.4 to 1.2 A maximum. By using primary-

side voltage sensing, the need for a secondary-side resistive

voltage divider is eliminated. This has the additional benefit

of reducing leakage currents on the secondary side of the

transformer. To extend battery life, the A8437 features very

low supply current draw—typically 0.1 μAin shutdown mode

and 10 μA in standby mode.

The A8437 has a flash dual trigger IGBT driver and flash

interlock to increase the device noise immunity. The IGBT

driver also has separate source and sink connections, for

flexibility in controlling IGBT rise and fall times. The charge

and trigger voltage logic thresholds are set at 1.1 V_HI(min)

to support applications implementing low voltage control

logic.

▪ User-adjustable current limit from 0.4 to 1.2 A

▪ 1.1 V logic (V_HI(min)) compatibility

▪ Integrated IGBT driver with separate sink and source (CG

package) or common sink/source (EJ package)

▪ Flash dual trigger with interlock for increased noise

immunity

▪ Optimized for mobile phone, 1-cell Li+ battery applications

▪ No primary-side Schottky diode needed

▪ Zero-voltage switching for lower loss

▪ >75% efficiency

▪ Optional regulation feature to maintain the output voltage

▪ Charge complete indication

▪ Integrated 40 V DMOS switch

The A8437 is available in a 10-pin, 3 mm × 3 mm DFN/MLP

package with exposed pad for enhanced thermal performance.

For an even smaller PCB footprint, a wafer-level chip scale

package (WLCSP) option is available.

Packages:

10-contact DFN/MLP

3 mm × 3 mm

0.75 nominal overall height

(Package EJ)

Applications include:

▪ Mobile phone flash

▪ Digital and film camera flash

12-ball WLCSP

1.205 mm × 1.635 mm

0.5 nominal overall height

(Package CG)

Typical Application

CG Package

EJ Package

1 : 10

Battery Input

2.3 to 5.5 V

Battery Input

2.3 to 5.5 V

COUT

100 μF

315 V

COUT

100 μF

VIN

315 V

VOUT Detect

TLIM

ISET

VOUT Detect

ISET

Control

Block

Control

Block

I_SWsense

Connect

to VIN

I_SWsense

Connect

to VIN

RSET

Application 1. Typical application

without output voltage regulation.

Note: Application must

REG

VPULLUP

DONE

CHARGE

DONE

CHARGE

periodically restart the charging

cycle to recover lost charge on

the output capacitor.

100 kΩ

DONE

VIN

IGBT Driver

GSOURCE

GSINK

IGBT Driver

IGBT Gate

TRIGGER1

TRIGGER2

IGBT Gate

TRIGGER1

TRIGGER2

GATE

GND

A8437-DS, Rev. 1

12 3 4 5 6 7...21

中文翻译

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与A8437相关器件

型号	品牌	获取价格	描述	数据表
A8437ECGLT	ALLEGRO	获取价格	Analog Circuit, 1 Func, PBGA12, 1.635 X 1.205 MM, 0.50 MM HEIGHT, WLCSP-12
A8438	ALLEGRO	获取价格	Photoflash Capacitor Charger with IGBT Driver
A8438_06	ALLEGRO	获取价格	Photoflash Capacitor Charger with IGBT Driver
A8438_13	ALLEGRO	获取价格	Photoflash Capacitor Charger with IGBT Driver
A8438EEJ-T	ALLEGRO	获取价格	Analog Circuit, 1 Func, PDSO10, 3 X 3 MM, 0.75 MM HEIGHT, LEAD FREE, MO-229WEED, TDFN-10
A8438EEJTR-T	ALLEGRO	获取价格	Photoflash Capacitor Charger with IGBT Driver
A8439	ALLEGRO	获取价格	Photoflash Capacitor Charger with IGBT Driver and Refresh
A8439EEJTR-T	ALLEGRO	获取价格	Photoflash Capacitor Charger with IGBT Driver and Refresh
A8447	ALLEGRO	获取价格	High Voltage Step Down Regulator
A8447SLJTR-T	ALLEGRO	获取价格	High Voltage Step Down Regulator

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