Datasheet > LM3554TMX/NOPB

LM3554TMX/NOPB

更新时间： 2024-11-16 11:12:39

品牌	Logo	应用领域
德州仪器 - TI		升压转换器驱动接口集成电路驱动器
页数	文件大小	规格书
47页	4365K
描述
具有 1.2A 双路高侧 LED 驱动器和 I2C 兼容接口的同步升压转换器 \| YFQ \| 16 \| -30 to 85

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LM3554

SNVS549C –JUNE 2009–REVISED FEBRUARY 2016

LM3554 Synchronous Boost Converter With 1.2-A Dual High-Side LED Drivers and I²C-

Compatible Interface

1 Features

3 Description

The LM3554 is a 2-MHz fixed-frequency, current-

mode synchronous boost converter. The device is

designed to operate as a dual 600-mA (1.2 A total)

constant-current driver for high-current white LEDs, or

as a regulated 4.5-V or 5-V voltage source.

The main features include: an I²C-compatible

interface for controlling the LED current or the desired

output voltage, a hardware flash enable input for

direct triggering of the flash pulse, and dual TX inputs

which force the flash pulse into a low-current torch

mode allowing for synchronization to RF power

amplifier events or other high-current conditions.

Additionally, an active high hardware enable (HWEN)

input provides a hardware shutdown during system

software failures.

•

Input Voltage: 2.5 V to 5.5 V

Programmable 4.5-V or 5-V Constant Output

Voltage

•

Dual High-Side Current Sources

Grounded Cathode Allowing for Better Heat

Sinking and LED Routing

•

> 90% Efficiency

Ultra-Small Solution Size: < 23 mm²

Four Operating Modes: Torch, Flash, LED

Indicator, and Voltage Output

•

Accurate and Programmable LED Current from

37.5 mA to 1.2 A

•

Hardware Flash and Torch Enable

Five protection features are available within the

LM3554 including a software selectable input voltage

monitor, an internal comparator for interfacing with an

external temperature sensor, four selectable current

limits to ensure the battery current is kept below a

predetermined peak level, an overvoltage protection

feature to limit the output voltage during LED open

circuits, and an output short circuit protection which

limits the output current during shorts to GND.

LED Thermal Sensing and Current Scaleback

Software Selectable Input Voltage Monitor

Programmable Flash Timeout

Dual Synchronization Inputs for RF Power-

Amplifier Pulse Events

•

Open and Short LED Detection

Active High Hardware Enable for Protection

Against System Faults

400-kHz I²C-Compatible Interface

Device Information⁽¹⁾

•

PART NUMBER

LM3554

PACKAGE

BODY SIZE (MAX)

2 Applications

1.685 mm × 1.685

DSBGA (16)

•

Camera Phone LED Flash Controller

Class D Audio Amplifier Power

LED Current Source Biasing

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

the end of the data sheet.

Typical Application Circuit

2.2 µH

4.5-V or 5-V DC Power Rail

4.7 µF

OUT

2.5 V œ 5.5 V

4.7 µF

VBIAS

HWEN

SCL

LED1

LED2

Flash

LEDs

SDA

R_BIAS

STROBE

TX1/TORCH/

GPIO1

ENVM/TX2

LEDI/NTC

Indicator

LED

2 kΩ

Thermistor

/GPIO

0.1 µF

GND

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...47

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LM3554TMX/NOPB 替代型号

型号	品牌	替代类型	描述	数据表
LM3554TME/NOPB	TI	类似代替	具有 1.2A 双路高侧 LED 驱动器和 I2C 兼容接口的同步升压转换器 \| YFQ

与LM3554TMX/NOPB相关器件

型号	品牌	获取价格	描述	数据表
LM3555	NSC	获取价格	Synchronous Boost Converter with 500 mA High Side LED Driver and Dual-Mode Control Interfa
LM3555	TI	获取价格	具有 500mA 高侧 LED 驱动器和双模式控制接口的同步升压转换器
LM3555TLE/NOPB	TI	获取价格	具有 500mA 高侧 LED 驱动器和双模式控制接口的同步升压转换器 \| YZR \| 1
LM3555TLX/NOPB	TI	获取价格	具有 500mA 高侧 LED 驱动器和双模式控制接口的同步升压转换器 \| YZR \| 1
LM3556	TI	获取价格	1.5A Synchronous Boost LED Flash Driver w/ High-Side Current Source
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

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