LM3556 - 具有高侧的 LM3556 1.5A 同步升压 LED 闪存驱动器

LM3556是TI德州仪器公司的一款相机闪光灯LED驱动器产品，LM3556是具有高侧的 LM3556 1.5A 同步升压 LED 闪存驱动器，本站介绍了LM3556的封装应用图解、特点和优点、功能等，并给出了与LM3556相关的TI元器件型号供参考。

LM3556 - 具有高侧的 LM3556 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

Grounded Cathode LED Operation for Improved Thermal Management
1.5-A High-Side Current Source for Single LED
Accurate and Programmable LED Current from 46.9 mA to 1.5 A
> 85% Efficiency in Torch Mode (at 100 mA) and Flash Mode (at 1 A to 1.5 A)
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-Compatible Programmable NTC Trip Point
0.4-mm Pitch, 16-Pin DSBGA Package

产品应用

Camera Phone LED Flash

产品说明

The LM3556 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 LM3556 is controlled via an I2C-compatible interface. Features include: a hardware flash enable (STROBE) allowing 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 provide 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.

The 4-MHz switching frequency, overvoltage protection and adjustable current limit allow for the use of tiny, low-profile inductors and 10-µF ceramic capacitors. The device is operates over a −40°C to +85°C temperature range.

产品器件信息

PART NUMBER	PACKAGE	BODY SIZE (MAX)
LM3556	DSBGA (16)	1.69 mm × 1.64 mm

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