LM3639AYFQR集成电路（IC）的LED驱动器规格书PDF中文资料

LM3639AYFQR属于集成电路（IC）的LED驱动器。由美国德州仪器公司制造生产的LM3639AYFQRLED 驱动器器件属于 LED 驱动器电源管理集成电路 (PMIC) 系列，可通过标称固定电压的电源为负载（通常为发光二极管）提供电流，并且电流可控。它与用于电压调节的类似产品的主要区别在于，这类器件提供较低的反馈电压（以提高系统能效），而且通常可对器件工作点进行外部控制，可在照明应用中用于实现调光功能。

1FEATURES

2• Single Chip White LED Flash and Backlight

Driver

• 1.5A Flash LED Current

• Dual String Backlight Control (40V Max VOUT)

• 128 Level Exponential and Linear Brightness

Control

• PWM Input for CABC

• Programmable Over-Voltage Protection

(Backlight)

• Programmable Current Limit (Flash)

• Programmable Switching Frequency

• Optimized Flash Current During Low-Battery

Conditions

APPLICATIONS

• White LED Backlit Display Power

• White LED Camera Flash Power

DESCRIPTION

The LM3639A is a single-chip white LED Camera

Flash Driver + LCD Display Backlight Driver. The lowvoltage,

high-current flash LED driver is a

synchronous boost which provides the power for a

single flash LED at up to 1.5A or dual LEDs at up to

750 mA each. The high-voltage backlight driver is a

dual-output asynchronous boost which powers dual

LED strings at up to 40V and 30 mA per string. An

adaptive regulation method in both boost converters

regulates the headroom voltage across the respective

source/sink to ensure the LED current remains in

regulation while maximizing efficiency. The

LM3639A's flash driver is a 2MHz or 4MHz fixed-

frequency synchronous boost converter plus 1.5A

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

1.5A. An adaptive regulation method ensures the

current source remains in regulation and maximizes

efficiency.

The device is controlled by an I2C-compatible

interface. Features for the flash LED driver include a

hardware flash enable (STROBE) allowing a logic

input to trigger the flash pulse, and a TX input for

synchronization to RF power amplifier events or other

high current conditions. Features for the LCD

backlight driver include a PWM input for content

adjustable backlight control, 128 exponential or linear

brightness levels, programmable over-voltage

protection, and selectable switching frequency (500

kHz or 1 MHz).

The device is available in a tiny 1.790 mm x 2.165

mm x 0.6 mm 20-bump, 0.4 mm pitch DSBGA

package and operates over the −40°C to +85°C

temperature range.