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LM3556TMXSLASHNOPB.A数据手册规格书PDF详情
1 Features
1• 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
2 Applications
Camera Phone LED Flash
3 Description
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.
供应商 | 型号 | 品牌 | 批号 | 封装 | 库存 | 备注 | 价格 |
---|---|---|---|---|---|---|---|
NS |
23+ |
QFN |
250 |
全新原装正品现货,支持订货 |
|||
TI |
22+ |
8WSON |
9000 |
原厂渠道,现货配单 |
|||
LM3557SD2 |
44462 |
44462 |
|||||
TI |
23+ |
8WSON |
9000 |
原装正品,支持实单 |
|||
National |
24+ |
LLP-8 |
6980 |
原装现货,可开13%税票 |
|||
TexasInstruments |
18+ |
ICLEDDRIVERWHITEBCKLGT8- |
6580 |
公司原装现货/欢迎来电咨询! |
|||
TI |
20+ |
原装 |
65790 |
原装优势主营型号-可开原型号增税票 |
|||
Texas Instruments |
24+ |
8-WFDFN 裸露焊盘 |
39500 |
一级代理/放心采购 |
|||
NSC |
06+ |
LLP |
23000 |
优势 |
|||
TI |
20+ |
DFN-8 |
1001 |
就找我吧!--邀您体验愉快问购元件! |
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Texas Instruments 美国德州仪器公司
德州仪器(Texas Instruments),简称TI,是全球领先的半导体公司,为现实世界的信号处理提供创新的数字信号处理(DSP)及模拟器件技术。除半导体业务外,还提供包括传感与控制、教育产品和数字光源处理解决方案。TI总部位于美国德克萨斯州的达拉斯,并在25多个国家设有制造、设计或销售机构。德州仪器是推动互联网时代不断发展的半导体引擎,作为实时技术的领导者,TI正在快速发展,在无线与宽带接入等大型市场及数码相机和数字音频等新兴市场方面,凭借性能卓越的半导体解决方案不断推动着互联网时代的前进步伐。TI预想未来世界的方方面面都渗透着TI产品的点点滴滴,每个电话、每次上网、拍的每张照片、听的每