Datasheet > LM3550SP

LM3550SP

更新时间： 2024-11-14 12:09:47

品牌	Logo	应用领域
德州仪器 - TI		驱动器闪光灯
页数	文件大小	规格书
29页	1959K
描述
5A Flash LED Driver with Automatic VLED and ESR Detection for Mobile Camera Systems

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LM3550SP 数据手册

February 29, 2012

LM3550

5A Flash LED Driver with Automatic V_LEDand ESR

Detection for Mobile Camera Systems

General Description

Features

LM3550 is a low-noise, switched-capacitor DC/DC converter

designed to operate as a current-limited and adjustable (up

to 5.3V) super-capacitor charger. LM3550 features user-se-

lectable super-capacitor charge-termination voltages and an

optimal charge-termination mode that maximizes flash-ener-

gy efficiency by accounting for flash element losses. Addi-

tionally, the device provides one adjustable constant current

output (up to 200 mA) and one NFET controller ideal for driv-

ing one or more high-current LEDs either in a high-power flash

mode or a low-power torch mode.

Up to 5A Flash Current

■

4 Selectable Super-Capacitor Charge Voltage Levels

(4.5V, 5.0V, 5.3V, Optimized)

Flash Optimized Charge Mode for Optimal Efficiency

■

−33% Faster Charge Time Using Optimal Mode

−49% Less Power Dissipated in Current Source using

Optimal Charge Mode

Fast Super-Capacitor Charger with 500 mA Input Current

Limit

■

Adjustable Torch Current (60 mA to 200 mA)

■

The LM3550 can be configured to utilize a proprietary super-

capacitor charging scheme (Optimal Charge Mode), allowing

faster charging times (0 to Target Voltage) and lower current-

source power dissipation. Optimal Charge Mode adapts to

changes in the flash LEDs forward voltage as well as the su-

per-capacitor's ESR ensuring that the super-capacitor is

charged to the ideal voltage required to sustain constant cur-

rent-flash operation.

Ambient Light or LED Thermal Sensing with Current

Scaleback

End-of-Charge Output (EOC)

■

Dedicated Indicator LED Current Source

No Inductor Required

Manual Flash Enable via Strobe Pin Input

Programmable Flash Pulse Duration, and Torch and Flash

Currents via I²C-compatible Interface

■

The LED current and Flash pulse duration of the LM3550 can

be programmed via an I²C-compatible interface. The

STROBE pin allows the Flash to be toggled via a flash-enable

signal from a camera module. The EOC pin sinks current

when the output voltage reaches 95% of the final value.

True Shutdown (LED Disconnect)

■

Flash Time-Out Protection

LED Temperature Protection or Ambient Light Sensing Pin

The ALD/TEMP input pin allows either a light sensor to adjust

the flash-current level based on the ambient light conditions,

or it allows for over-temperature detection and protection of

the LED during high-power operation or high ambient-tem-

perature conditions by connecting an NTC thermistor tem-

perature monitoring circuit to the pin.

Low Profile 20-Pin LLP Package (3.0 mm × 2.5 mm × 0.8

mm)

Applications

Camera Phones

■

Digital Still Camera

Voltage Rail Management

Typical Application Circuit

30059459

Solution Size

30059401

300594 SNVS569A

www.ti.com

12 3 4 5 6 7...29

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与LM3550SP相关器件

型号	品牌	获取价格	描述	数据表
LM3550SP/NOPB	TI	获取价格	具有自动 Vf 和 ESR 检测功能的 LED 闪光灯驱动器，适用于移动摄像机系统 \| N
LM3550SPX	TI	获取价格	5A Flash LED Driver with Automatic VLED and ESR Detection for Mobile Camera Systems
LM3550SPX/NOPB	TI	获取价格	具有自动 Vf 和 ESR 检测功能的 LED 闪光灯驱动器，适用于移动摄像机系统 \| N
LM3551	NSC	获取价格	1A White LED Driver with Flash Timeout Protection
LM3551	TI	获取价格	1A White LED Driver with Flash Timeout Protection
LM3551_06	NSC	获取价格	1A White LED Driver with Flash Timeout Protection
LM3551SD	NSC	获取价格	1A White LED Driver with Flash Timeout Protection
LM3551SD	TI	获取价格	LED DISPLAY DRIVER, QCC14, 4 X 4 MM, LLP-24
LM3551SD/NOPB	TI	获取价格	1A White LED Driver with Flash Timeout Protection 14-WSON -40 to 85
LM3551SDX	NSC	获取价格	1A White LED Driver with Flash Timeout Protection

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