LM3642 - 具有高侧电流的 1.5A 同步升压 LED 闪存驱动器

LM3642是TI德州仪器公司的一款相机闪光灯LED驱动器产品，LM3642是具有高侧电流的 1.5A 同步升压 LED 闪存驱动器，本站介绍了LM3642的封装应用图解、特点和优点、功能等，并给出了与LM3642相关的TI元器件型号供参考。

LM3642 - 具有高侧电流的 1.5A 同步升压 LED 闪存驱动器 - 相机闪光灯LED驱动器 - LED驱动器 - 德州仪器

产品特性

1.5-A High-Side Current Source for Single LED
> 85% Efficiency in Torch Mode (at 100 mA) and Flash Mode (at 1 A to 1.5 A)
Accurate Programmable Flash LED Current from 93 mA to 1.5 A
Accurate Programmable Torch LED Currents:
- 48.4 mA to 375 mA
- 24 mA to 187 mA (LT option)
Small Solution Size: < 20 mm2
Soft-Start Operation for Battery Protection
Hardware Strobe Enable
Synchronization Input for RF Power Amplifier Pulse Events
VIN Flash Monitor Optimization
400-kHz I2C-Compatible Interface
0.5-mm Pitch, 9-Bump DSBGA

产品应用

Camera Phone LED Flash

产品说明

The LM3642 is a 4-MHz fixed-frequency synchronous boost converter plus 1.5-A 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 1.5 A. An adaptive regulation method ensures the current source remains in regulation and maximizes efficiency.

The LM3642 is controlled via an I2C-compatible interface. Features include a hardware flash enable (STROBE) allowing a logic input to trigger the flash pulse as well as 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.

The 4-MHz switching frequency, overvoltage protection and adjustable current limit settings allow the use of tiny, low-profile inductors and (10-µF) ceramic capacitors. The device is available in a small 9-bump DSBGA package and operates over the −40°C to 85°C temperature range.

产品器件信息

PART NUMBER	PACKAGE	BODY SIZE (MAX)
LM3642	DSBGA (9)	1.69 mm × 1.64 mm

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