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LM3644YFFR.A中文资料德州仪器数据手册PDF规格书

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厂商型号

LM3644YFFR.A

功能描述

LM3644 Dual 1.5-A Current Source Camera Flash LED Driver

丝印标识

3644

封装外壳

DSBGA

文件大小

1.04151 Mbytes

页面数量

42

生产厂商

TI

中文名称

德州仪器

网址

网址

数据手册

下载地址一下载地址二到原厂下载

更新时间

2025-12-12 20:05:00

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LM3644YFFR.A规格书详情

1 Features

1• Dual Independent 1.5-A LED Current Source

Programmability

• Accurate and Programmable LED Current Range

from 1.4 mA to 1.5 A

• Torch Currents up to 360 mA (LM3644TT)

• Flash Timeout Values up to 1.6 seconds

(LM3644TT)

• Optimized Flash LED Current During Low Battery

Conditions (IVFM)

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

Flash Mode (at 1 A to 1.5 A)

• 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

– LM3644 (I2C Address = 0x63)

2 Applications

• Camera Phone White LED Flash

• Digital Still Cameras

• Fire-Alarm Notification

• Emergency Strobe Lighting

• Intruder Alert Notification

• Barcode Scanners

• Handheld Data Terminals

3 Description

The LM3644 is a dual LED flash driver that provides

a high level of adjustability within a small solution

size. The LM3644 utilizes a 2-MHz or 4-MHz fixedfrequency

synchronous boost converter to provide

power to the dual 1.5-A constant current LED

sources. The dual 128 level current sources provide

the flexibility to adjust the current ratios between

LED1 and LED2. An adaptive regulation method

ensures the current sources remain in regulation and

maximizes efficiency.

Features of the LM3644 are controlled via an I2Ccompatible

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.

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.

供应商 型号 品牌 批号 封装 库存 备注 价格
原装
20+
原装
56200
原装优势主营型号-可开原型号增税票
询价
TI/德州仪器
22+
UNKNOWN
30000
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询价
TI
23+
BGA
50000
只做原装正品
询价
TI
22+
5000
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询价
TI
25+23+
23369
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询价
TI/德州仪器
22+
UNKNOWN
12245
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询价
TI
23+
QFN
3200
正规渠道,只有原装!
询价
TI
25+
DSBGA-20
30000
代理全新原装现货,价格优势
询价
TI
23+
NA
20000
询价
TI
16+
DSBGA
10000
原装正品
询价