Datasheet > LM3643

LM3643

更新时间： 2024-11-15 01:04:31

品牌	Logo	应用领域
德州仪器 - TI		/
页数	文件大小	规格书
39页	1339K
描述
Synchronous Boost Dual LED Flash Driver with 1.5-A High-Side Current Sources

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LM3643, LM3643A

SNVS967A –AUGUST 2014–REVISED NOVEMBER 2014

LM3643 Synchronous Boost Dual LED Flash Driver with 1.5-A High-Side Current Sources

1 Features

3 Description

The LM3643 is a dual LED flash driver that provides

a high level of adjustability within a small solution

size. The LM3643 utilizes a 2-MHz or 4-MHz fixed-

frequency synchronous boost converter to provide

power to the dual 1.5-A constant current LED

sources. The total LED current the LM3643 boost can

deliver is 1.5 A (I_LED1+ I_LED2). The dual 128 level

current sources provide the flexibility to adjust the

current ratios between LED1 and LED2 with each

driver capable of delivering a maximum of 1.5 A (ex:

•

1.5 A Total Allowed LED Current During Operation

(I_LED1+ I_LED2= 1.5 A)

Dual Independent LED Current Source

Programmability

Accurate and Programmable LED Current Range

from 1.4 mA to 1.5 A

Optimized Flash LED Current During Low Battery

Conditions (IVFM)

> 85% Efficiency in Torch Mode (@ 100 mA) and

Flash Mode (@1 A to 1.5 A)

I_LED1= 1.5 A and I_LED2= 0FF, I_LED1= 0FF and I_LED2

1.5 A, or a current configuration with a current less

than 1.5 A , I_LED1= 950 mA and I_LED2= 250 mA). An

adaptive regulation method ensures the current

sources remain in regulation and maximizes

efficiency.

Features of the LM3643 are controlled via an I²C-

compatible interface. These features include:

hardware flash and hardware torch pins (STROBE

and TORCH/TEMP), a TX interrupt, and an NTC

thermistor monitor. The device offers independently

programmable currents in each output leg to drive the

LEDs in a Flash or Movie Mode (Torch) condition.

Grounded Cathode LED Operation for Improved

Thermal Management

Small Solution Size: < 16 mm²

•

Hardware Strobe Enable (STROBE)

Synchronization Input for RF Power Amplifier

Pulse Events (TX)

•

Hardware Torch Enable (TORCH/TEMP)

Remote NTC Monitoring (TORCH/TEMP)

400-kHz I²C-Compatible Interface

–

LM3643 (I²C Address = 0x63)

LM3643A (I²C Address = 0x67)

The 2-MHz or 4-MHz switching frequency options,

overvoltage protection (OVP), and adjustable current

limit allow for the use of tiny, low-profile inductors and

(10-µF) ceramic capacitors. The device operates over

a –40°C to 85°C ambient temperature range.

2 Applications

Camera Phone White LED Flash

Device Information⁽¹⁾

PART NUMBER

LM3643

PACKAGE

BODY SIZE (MAX)

DSBGA (12)

1.69 mm x 1.31 mm

(1) For all available packages, see the orderable addendum at

the end of the datasheet.

4 Simplified Schematic

1 PH

OUT

2.5V to 5.5V

10 PF

LM3643

LED1

TORCH/TEMP

STROBE

HWEN

SDA

SCL

Flash

LED

LED2

GND

Flash

LED

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

12 3 4 5 6 7...39

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与LM3643相关器件

型号	品牌	获取价格	描述	数据表
LM3643_15	TI	获取价格	Synchronous Boost Dual LED Flash Driver with 1.5-A High-Side Current Sources
LM3643A	TI	获取价格	Synchronous Boost Dual LED Flash Driver with 1.5-A High-Side Current Sources
LM3643AYFFR	TI	获取价格	Synchronous Boost Dual LED Flash Driver with 1.5-A High-Side Current Sources
LM3643YFFR	TI	获取价格	Synchronous Boost Dual LED Flash Driver with 1.5-A High-Side Current Sources
LM3644	TI	获取价格	双 1.5A 电流源摄像头 LED 闪光灯驱动器
LM3644TTYFFR	TI	获取价格	双 1.5A 电流源摄像头 LED 闪光灯驱动器 \| YFF \| 12 \| -40 to
LM3644YFFR	TI	获取价格	双 1.5A 电流源摄像头 LED 闪光灯驱动器 \| YFF \| 12 \| -40 to
LM3645	ETC	获取价格	Battery Management
LM3646	TI	获取价格	1.5A Synchronous Boost Converter with Dual High-Side Current Sources and I2CCompatible Int
LM3646YFQR	TI	获取价格	具有双高侧电流源的 1.5A 同步升压 LED 闪光灯驱动器 \| YFQ \| 20 \| -

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