Datasheet > LM3646

LM3646

更新时间： 2024-11-04 12:49:47

品牌	Logo	应用领域
德州仪器 - TI		转换器升压转换器
页数	文件大小	规格书
31页	1186K
描述
1.5A Synchronous Boost Converter with Dual High-Side Current Sources and I2CCompatible Interface

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LM3646 数据手册

LM3646

www.ti.com

SNVS962 –DECEMBER 2013

1.5A Synchronous Boost Converter with Dual High-Side Current Sources and I²C-

Compatible Interface

Check for Samples: LM3646

FEATURES

DESCRIPTION

The LM3646 is a 4 MHz fixed-frequency, Current

Mode synchronous boost converter. The device is

designed to operate as a dual 1.5A constant current

driver for high current LEDs. The high-side current

sources allow for grounded cathode LED operation

providing Flash current up to 1.5A total. An adaptive

headroom regulation scheme ensures the LED

currents remain in regulation and maximizes

efficiency.

•

High-Side Current Sources allowing for

Grounded LED Cathode for Improved Thermal

Management

•

> 85% Efficiency in Torch and Flash Modes

Small Solution Size < 20 mm²

Accurate and Programmable Flash LED

Current from 24 mA to 1.5A in 11.7 mA steps

•

Accurate and Programmable Torch LED

Current from 2.5 mA to 187 mA in 1.5 mA

steps

The LM3646 is controlled via an I²C-compatible

interface. The main features of the LM3646 include: a

hardware flash enable (STROBE) input for direct

triggering of the Flash pulse, a hardware Torch

enable (TORCH) for Movie Mode or Flashlight

functions, a TX input which forces the flash pulse into

Dual 1.5A High-Side Current Sources for Dual

LED Drive

•

Hardware Flash and Torch Enables

Hardware Enable Pin

low-current

Torch

Mode

allowing

for

synchronization to RF power amplifier events or other

high-current conditions, an integrated comparator

designed to monitor an NTC thermistor and provide

an interrupt to the LED current, and a programmable

input voltage monitor which monitors the battery

voltage and can reduce the flash current during low

battery conditions. A hardware enable (ENABLE)

input provides a hardware shutdown during system

software failures.

Soft-Start Operation for Battery Protection

LED Thermal Sensing and Current Scale-Back

Synchronization Input for RF Power Amplifier

Pulse Events

•

VIN Flash Monitor Optimization

1 MHz I²C-Compatible Interface

I²C-Programmable NTC Trip Point

0.4 mm pitch, 20-Bump DSBGA

The

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 available in a small 20-

bump DSBGA package and operates over the −40°C

to +85°C temperature range.

APPLICATIONS

•

Camera Phone LED Flash/Torch

SYSTEM PERFORMANCE

TYPICAL APPLICATION CIRCUIT

2800

1 PH

TA = +25ºC

TA = -40ºC

TA = +85ºC

2600

2400

2200

2000

1800

1600

1400

1200

I_LED= 1.5A, V_LED= 3.7V

OUT

2.7V to 5.5V

10 PF

LM3646

LED1

LED2

ENABLE

STROBE

TORCH

TEMP

SDA

2.8

3.2 3.4 3.6 3.8

4.2 4.4 4.6 4.8

SCL

C032

GND

V_IN(V)

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

12 3 4 5 6 7...31

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与LM3646相关器件

型号	品牌	获取价格	描述	数据表
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 \| -
LM3647	NSC	获取价格	Universal Battery Charger for Li-Ion, Ni-MH and Ni-Cd Batteries
LM3647IM	NSC	获取价格	Universal Battery Charger for Li-Ion, Ni-MH and Ni-Cd Batteries
LM3647IM/NOPB	TI	获取价格	IC,BATTERY MANAGEMENT,BIPOLAR,SOP,20PIN,PLASTIC
LM3647M	ETC	获取价格	Battery Management
LM3648	TI	获取价格	具有 1.5A 高侧电流源的 LM3648 同步升压 LED 闪光灯驱动器
LM3648TTYFFR	TI	获取价格	具有 1.5A 高侧电流源的 LM3648 同步升压 LED 闪光灯驱动器 \| YFF \|
LM3648YFFR	TI	获取价格	具有 1.5A 高侧电流源的 LM3648 同步升压 LED 闪光灯驱动器 \| YFF \|
LM3655	NSC	获取价格	Charge Control and Protection IC for embedded single
LM3658	NSC	获取价格	Dual Source USB/AC Li Chemistry Charger IC for Portable Applications

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