A8438EEJ-T

更新时间： 2024-02-16 11:10:47

品牌	Logo	应用领域
急速微 - ALLEGRO		驱动器闪光灯双极性晶体管
页数	文件大小	规格书
13页	528K
描述
Analog Circuit, 1 Func, PDSO10, 3 X 3 MM, 0.75 MM HEIGHT, LEAD FREE, MO-229WEED, TDFN-10

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A8438EEJ-T 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Obsolete	零件包装代码：	SON
包装说明：	HVSON, SOLCC10,.12,20	针数：	10
Reach Compliance Code：	compliant	HTS代码：	8542.39.00.01
风险等级：	5.8	Is Samacsys：	N
模拟集成电路 - 其他类型：	ANALOG CIRCUIT	JESD-30 代码：	S-XDSO-N10
JESD-609代码：	e3	长度：	3 mm
湿度敏感等级：	1	功能数量：	1
端子数量：	10	最高工作温度：	85 °C
最低工作温度：	-40 °C	封装主体材料：	UNSPECIFIED
封装代码：	HVSON	封装等效代码：	SOLCC10,.12,20
封装形状：	SQUARE	封装形式：	SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE
峰值回流温度（摄氏度）：	NOT SPECIFIED	电源：	3.3/5 V
认证状态：	Not Qualified	座面最大高度：	0.8 mm
子类别：	Power Management Circuits	最大供电电压 (Vsup)：	5.5 V
最小供电电压 (Vsup)：	3 V	标称供电电压 (Vsup)：	3.3 V
表面贴装：	YES	温度等级：	INDUSTRIAL
端子面层：	Matte Tin (Sn)	端子形式：	NO LEAD
端子节距：	0.5 mm	端子位置：	DUAL
处于峰值回流温度下的最长时间：	NOT SPECIFIED	宽度：	3 mm
Base Number Matches：	1

A8438EEJ-T 数据手册

A8438

Photoflash Capacitor

Charger with IGBT Driver

Package EJ:

MLP/TDFN, 3 × 3 mm

0.75 mm nominal height

FEATURES

ꢀPower with 1 Li+ or 2 Alkaline/NiMH/NiCAD batteries

ꢀAdjustable output voltage

ꢀ>75% efficiency

ꢀThree levels of switch current limit: 1.6, 1.8, 2.0 A

ꢀFast charge time

ꢀCharge complete indication

Approximate Scale 1:1

ꢀIntegrated IGBT driver with trigger

ꢀNo primary-side Schottky diode needed

ꢀLow-profile package (0.75 mm nominal height)

The A8438 is a highly integrated IC that charges

photoflash capacitors for digital and film cameras. It

also features an integrated IGBT driver that facilitates

the flash discharge function and saves board space.

To charge the photoflash capacitor, the A8438

integrates a 40 V, DMOS switch that drives the trans-

former in a flyback topology, allowing optimized

design with tight coupling and high efficiency. A pro-

prietary control scheme optimizes the capacitor charg-

ing time. Low quiescent current and low shutdown

current further improve system efficiency and extend

battery life.

APPLICATIONS

ꢀDigital camera flash

ꢀFilm camera flash

ꢀCell phone flash

ꢀEmergency strobe light

Two Alkaline/NiMH/NiCAD or one Li+ battery

or 1.5 to 5.5 V

3.0 to 5.5 V

BIAS

V_BATT

V_OUT

0.1 μF

4.7 μF

COUT

10 kΩ

100 kΩ

VIN

ILIM

2.0 A

1.8 A (N.C.)

1.6 A

Three levels of switch current limit are provided:

1.6, 1.8, and 2.0 A. The level is determined by config-

uring the ILIM pin as grounded, floating, or pulled up

to IC supply voltage, respectively.

CHARGE

A8438

DONE

TRIGGER

IGBTDRV

To IGBT Gate

GND

The CHARGE pin enables the A8438 and starts the

charging of the output capacitor. When the designated

output voltage is reached, the A8438 stops the charg-

ing until the CHARGE pin is toggled again. Pulling

the CHARGE pin low stops charging. The ¯D¯O¯¯N¯¯E¯¯ pin

is an open-drain indicator of when the designated out-

put voltage is reached.

Figure 1. Typical circuit with separate power supply to transformer

One Li+ battery

or 3.0 to 5.5 V

BATT

V_OUT

0.1 μF

4.7 μF

COUT

The A8438 can be used with two Alkaline/NiMH/

NiCAD or one single-cell Li+ battery connected to the

transformer primary. Connect the VIN pin to a 3.0 to

5.5 V supply, which can be either the system rail or the

Li+ battery, if used.

10 kΩ

100 kΩ

VIN

ILIM

2.0 A

1.8 A (N.C.)

1.6 A

CHARGE

A8438

DONE

The A8438 is available in a very low profile

(0.75 mm) 10-terminal 3×3 mm MLP/TDFN package,

making it ideal for space-constrained applications. It is

lead (Pb) free, with 100% matte-tin leadframe plating.

TRIGGER

IGBTDRV

To IGBT Gate

GND

Figure 2. Typical circuit with single power supply

A8438-DS, Rev. 1

12 3 4 5 6 7...13

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