LM3556TMX/NOPB [TI]
LM3556 1.5A 感应式白光 LED 相机闪存器件 | YFQ | 16 | -40 to 85;
| 型号： | LM3556TMX/NOPB |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | LM3556 1.5A 感应式白光 LED 相机闪存器件 | YFQ | 16 | -40 to 85 闪存 |
| 文件： | 总5页 (文件大小：138K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
May 31, 2012
LM3556 PRODUCT BRIEF
1.5A Synchronous Boost LED Flash Driver w/ High-Side
Current Source
General Description
Features
The LM3556 is a 4 MHz 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 re-
mains in regulation and maximizes efficiency.
Grounded Cathode LED Operation for Improved Thermal
■
Management
1.5A High-Side Current Source for Single LED
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■
Accurate and Programmable LED Current from 46.9 mA
to 1.5A
> 85% Efficiency in Torch Mode (@ 100 mA) and Flash
Mode (@1A to 1.5A)
■
The LM3556 is controlled via an I2C-compatible interface.
Features include: a hardware flash enable (STROBE) allow-
ing 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 pro-
vide 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.
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-Programmable NTC Trip Point
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The 4 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 avail-
able in a small 16-bump (1.615 mm x 1.665 mm x 0.6 mm)
micro SMD package and operates over the −40°C to +85°C
temperature range.
0.4 mm Pitch, 16-Bump micro SMD
Applications
NOTE: This document is not a full datasheet. For more
information regarding this product or to order samples,
please contact your local Texas Instruments sales office
or visit www.ti.com.
Camera Phone LED Flash
■
Typical Application Circuit
30171801
© 2012 Texas Instruments Incorporated
301718 SNVS796A
www.ti.com
Physical Dimensions inches (millimeters) unless otherwise noted
TMD16ACA: 16-Bump micro SMD
X1 = 1.615 mm ±30 µm
X2 = 1.665 mm ±30 µm
X3 = 0.6 mm ±75 µm
www.ti.com
2
Notes
3
www.ti.com
Notes
www.ti.com
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