Datasheet > LM3556

LM3556

更新时间： 2024-11-15 12:46:35

品牌	Logo	应用领域
德州仪器 - TI		驱动器闪光灯
页数	文件大小	规格书
5页	138K
描述
1.5A Synchronous Boost LED Flash Driver w/ High-Side Current Source

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LM3556 数据手册

May 31, 2012

LM3556 PRODUCT BRIEF

1.5A Synchronous Boost LED Flash Driver w/ High-Side

Current Source

General Description

Features

The LM3556 is a 4 MHz fixed-frequency synchronous boost

converter plus 1.5A constant current driver for a high-current

white LED. The high-side current source allows for grounded

cathode LED operation providing Flash current up to 1.5A. An

adaptive regulation method ensures the current source re-

mains in regulation and maximizes efficiency.

Grounded Cathode LED Operation for Improved Thermal

■

Management

1.5A High-Side Current Source for Single LED

■

Accurate and Programmable LED Current from 46.9 mA

to 1.5A

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

Mode (@1A to 1.5A)

■

The LM3556 is controlled via an I²C-compatible interface.

Features include: a hardware flash enable (STROBE) allow-

ing a logic input to trigger the flash pulse, a hardware Torch

enable (TORCH) for Movie Mode or Flashlight functions, a TX

input which forces the flash pulse into a low-current Torch

mode allowing for synchronization to RF power amplifier

events or other high-current conditions, and an integrated

comparator designed to monitor an NTC thermistor and pro-

vide an interrupt to the LED current. With a fast 1 μs transition

from 0 mA to 46.9 mA, the Torch input pin can be used to

develop custom LED current waveforms.

Small Solution Size: < 20 mm²

■

LED Thermal Sensing and Current Scale-Back

Soft-Start Operation for Battery Protection

Hardware Enable Pin

Hardware Torch Enable

Hardware Strobe Enable

Synchronization Input for RF Power Amplifier Pulse

Events

VIN Flash Monitor Optimization

400 kHz I²C-Compatible Interface

I²C-Programmable NTC Trip Point

■

The 4 MHz switching frequency, over-voltage protection and

adjustable current limit allow for the use of tiny, low-profile

inductors and (10 µF) ceramic capacitors. The device is avail-

able in a small 16-bump (1.615 mm x 1.665 mm x 0.6 mm)

micro SMD package and operates over the −40°C to +85°C

temperature range.

0.4 mm Pitch, 16-Bump micro SMD

Applications

NOTE: This document is not a full datasheet. For more

information regarding this product or to order samples,

please contact your local Texas Instruments sales office

or visit www.ti.com.

Camera Phone LED Flash

■

Typical Application Circuit

30171801

301718 SNVS796A

www.ti.com

12 3 4 5

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与LM3556相关器件

型号	品牌	获取价格	描述	数据表
LM3556_14	TI	获取价格	1.5A Synchronous Boost LED Flash Driver w/ High-Side Current Source
LM3556TME/NOPB	TI	获取价格	LM3556 1.5A 感应式白光 LED 相机闪存器件 \| YFQ \| 16 \| -40
LM3556TMX/NOPB	TI	获取价格	LM3556 1.5A 感应式白光 LED 相机闪存器件 \| YFQ \| 16 \| -40
LM3557	NSC	获取价格	Step-Up Converter for White LED Applications
LM3557	TI	获取价格	Step-Up Converter for White LED Applications
LM3557SD-2	NSC	获取价格	Step-Up Converter for White LED Applications
LM3557SD-2	TI	获取价格	1.1A SWITCHING REGULATOR, 1600kHz SWITCHING FREQ-MAX, PDSO8, 1 MM HEIGHT, LLP-8
LM3557SD-2/NOPB	TI	获取价格	Step-Up Converter for White LED Applications 8-WSON -40 to 85
LM3557SDX-2	NSC	获取价格	Step-Up Converter for White LED Applications
LM3557SDX-2	TI	获取价格	1.1A SWITCHING REGULATOR, 1600kHz SWITCHING FREQ-MAX, PDSO8, 1 MM HEIGHT, LLP-8

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