Datasheet > LM3554

LM3554

更新时间： 2024-11-15 05:42:03

品牌	Logo	应用领域
美国国家半导体 - NSC		/
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Synchronous Boost Con

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LM3554 数据手册

June 8, 2009

LM3554 PRODUCT BRIEF

Synchronous Boost Converter with 1.2A Dual High Side

LED Drivers and I²C Compatible Interface

General Description

Features

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

chronous boost converter. The device is designed to operate

as a dual 600mA (1.2A total) constant current driver for high

current white LEDs, or as a regulated 4.5V or 5V voltage

source.

Dual High Side Current Sources

■

Grounded Cathode Allowing for Better Heatsinking and

LED Routing

>90% Efficiency

■

Ultra-Small Solution Size: < 23mm2

The dual high side current sources allow for grounded cath-

ode LED operation. An adaptive regulation method ensures

the current source for each LED remains in regulation and

maximizes efficiency.

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. Ad-

ditionally, an active high hardware enable (HWEN) input pro-

vides a hardware shutdown during system software failures.

Four Operating Modes: Torch, Flash, LED Indicator and

Voltage Output

Accurate and Programmable LED Current from 37.5mA to

1.2A

■

Programmable 4.5V or 5.0V Constant Output Voltage

■

Hardware Flash and Torch Enable

LED Thermal Sensing and Current Scaleback

Software Selectable Input Voltage Monitor

Programmable Flash Timeout

Dual Synchronization Inputs for RF Power Amplifier Pulse

Events

Five protection features are available within the LM3554 in-

cluding a software selectable input voltage monitor, an inter-

nal 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 over-

voltage protection feature to keeps the output voltage below

the OVP threshold in case of an open LED, and an output

short circuit protection which limits the output current during

an output short to GND. Additionally, the device provides var-

ious fault indicators including: a thermal fault flag indicating

the LED temperature has tripped the thermal threshold, a flag

indicating a TX event has occured, a flag indicating the flash

timeout counter has expired, a flag indicating the devices die

temperature has reached the thermal shutdown threshold,

and a flag indicating an open or short LED.

Open and Short LED Detection

■

Active High Hardware Enable for Protection Against

System Faults

400kHz I²C Compatible Interface

■

16-Bump (1.7mm × 1.7mm × 0.6mm) µSMD

Applications

Camera Phone LED Flash Controller

■

Class D Audio Amplifier Power

LED Current Source Biasing

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

imformation regarding this product, or to order samples,

please contact your National Semiconductor sales office

or visit http://www.national.com/support/dir.html.

300420

www.national.com

12 3 4

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与LM3554相关器件

型号	品牌	获取价格	描述	数据表
LM3554TME/NOPB	TI	获取价格	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
LM3554TME/NOPB	NSC	获取价格	IC LED DISPLAY DRIVER, PBGA16, 1.70 X 1.70 MM. 0.60 MM HEIGHT, 0.40 MM PITCH, LEAD FREE, U
LM3554TMX/NOPB	NSC	获取价格	IC LED DISPLAY DRIVER, PBGA16, 1.70 X 1.70 MM. 0.60 MM HEIGHT, 0.40 MM PITCH, LEAD FREE, U
LM3554TMX/NOPB	TI	获取价格	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
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

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