A8435

更新时间： 2024-02-03 22:39:48

品牌	Logo	应用领域
急速微 - ALLEGRO		驱动器泵
页数	文件大小	规格书
9页	388K
描述
High Efficiency Charge Pump White LED Driver

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技术参数
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A8435 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：	QFN
包装说明：	HVQCCN, LCC16,.12SQ,20	针数：	16
Reach Compliance Code：	unknown	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.82
数据输入模式：	SERIAL	接口集成电路类型：	LED DISPLAY DRIVER
JESD-30 代码：	S-XQCC-N16	JESD-609代码：	e3
长度：	3 mm	湿度敏感等级：	1
复用显示功能：	NO	功能数量：	1
区段数：	4	端子数量：	16
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：	HVQCCN
封装等效代码：	LCC16,.12SQ,20	封装形状：	SQUARE
封装形式：	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	峰值回流温度（摄氏度）：	260
电源：	3.6 V	认证状态：	Not Qualified
座面最大高度：	0.8 mm	子类别：	Display Drivers
最大供电电压：	5.5 V	最小供电电压：	2.7 V
标称供电电压：	3.6 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：	QUAD	处于峰值回流温度下的最长时间：	40
宽度：	3 mm	Base Number Matches：	1

A8435 数据手册

A8435

High Efficiency Charge Pump White LED Driver

Features and Benefits

Description

▪ Proprietary adaptive control scheme (1×, 1.5×)

▪ Maximum efficiency, over 92%

▪ 0.5% LED current matching

▪ 1 MHz operating frequency

▪ Flexible dimming control:

▫ Serial 11-level dimming, down to 5%

▫ PWM

The A8435 high efficiency charge pump IC offers a simple,

low-cost white LED driver solution for portable electronics

display applications. Using a proprietary control scheme (1×,

1.5×), the A8435 can output well-matched currents for up to

4 LEDs, while maintaining the highest efficiency over most

of the Li-ion battery lifetime.

The A8435 accepts an input range of 2.7 to 5.5 V and delivers

up to 30 mAfor each of the four regulated current sources. The

A8435candeliveratotalcontinuousoutputcurrentof120 mA,

meetingtherequirementsofmostLi-ionbattery-poweredwhite

LED backlight applications. Outputs can also be tied together

for WLED flash/torch applications.

▫ 2-bit parallel

▪ Drives up to 4 white LEDs

▪ 30 mA per LED

▪ 120 mA total continuous output

▪ Low input ripple and EMI

▪ Soft-start limits inrush current

▪ Short circuit protection

The A8435 offers flexible options for LED current driving.

The LED current can be set by any of the following methods:

(a) choosing an appropriate value for RSET, (b) 2-bit

parallel control with 3 levels, (c) PWM control, or (d) serial

programming

▪ Overvoltage protection

▪ Thermal shutdown protection

▪ Space-saving MLP-16 package: 3×3 mm footprint

▪ Very thin 0.75 mm nominal height package

TheA8435isavailableinaverythinprofile0.75 mm(nominal

height)3×3mmQFN/MLP-16package(ES), fittingtheneeds

of space-conscious applications.

Package: 16 pin QFN/MLP (suffix ES)

Applications include:

▪ White LED backlights for cellular phones, PDAs

▪ Digital cameras, camcorders

▪ Portable audio devices

▪ Other portable device white LED backlighting

▪ 120 mA WLED flash/torch

Approximate Scale

Typical Applications

V_BATT

2.7 to 5.5 V

VIN

VOUT

LED1

LED2

VIN

VOUT

LED1

LED2

CIN

C1+

COUT

1 µF

COUT

1 µF

C1-

C1–

C2+

A8435

1 µF

C2-

EN1

EN2

CTRL

C2–

LED3

Single-Wire On/Off and

Dimming Control

EN1

EN2

LED4

ISET

LED4

ISET

GND

NC CTRL

On/Off and

Dimming Control

RSET

Figure 1. Typical Circuit. Dual wire control configuration: 2-bit

parallel or PWM dimming.

Figure 2. Typical Circuit. Single wire control configuration.

A8435-DS, Rev. 1

12 3 4 5 6 7...9

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