LM3643
- 1.5 A Total Allowed LED Current During Operation
(ILED1 + ILED2 = 1.5 A) - Dual Independent LED Current Source Programmability
- Accurate and Programmable LED Current Range from
1.4 mA to 1.5 A - Optimized Flash LED Current During Low Battery
Conditions (IVFM) - > 85% Efficiency in Torch Mode (@ 100 mA) and
Flash Mode (@1 A to 1.5 A) - Grounded Cathode LED Operation for Improved Thermal
Management - Small Solution Size: < 16 mm2
- Hardware Strobe Enable (STROBE)
- Synchronization Input for RF Power Amplifier Pulse
Events (TX) - Hardware Torch Enable (TORCH/TEMP)
- Remote NTC Monitoring (TORCH/TEMP)
- 400-kHz I2C-Compatible Interface
- LM3643 (I2C Address = 0x63)
- LM3643A (I2C Address = 0x67)
The LM3643 is a dual LED flash driver that provides a high level of adjustability within a small solution size. The LM3643 utilizes a 2-MHz or 4-MHz fixed-frequency synchronous boost converter to provide power to the dual 1.5-A constant current LED sources. The total LED current the LM3643 boost can deliver is 1.5 A (ILED1 + ILED2 ). The dual 128 level current sources provide the flexibility to adjust the current ratios between LED1 and LED2 with each driver capable of delivering a maximum of 1.5 A (ex: ILED1 = 1.5 A and ILED2 = 0FF, ILED1 = 0FF and ILED2 = 1.5 A, or a current configuration with a current less than 1.5 A , ILED1 = 950 mA and ILED2 = 250 mA). An adaptive regulation method ensures the current sources remain in regulation and maximizes efficiency.
Features of the LM3643 are controlled via an I2C-compatible interface. These features include: hardware flash and hardware torch pins (STROBE and TORCH/TEMP), a TX interrupt, and an NTC thermistor monitor. The device offers independently programmable currents in each output leg to drive the LEDs in a Flash or Movie Mode (Torch) condition.
The 2-MHz or 4-MHz switching frequency options, overvoltage protection (OVP), and adjustable current limit allow for the use of tiny, low-profile inductors and (10-µF) ceramic capacitors. The device operates over a –40°C to 85°C ambient temperature range.
기술 자료
| 유형 | 직함 | 날짜 | ||
|---|---|---|---|---|
| * | Data sheet | LM3643 Synchronous Boost Dual LED Flash Driver with 1.5-A High-Side Current Sources datasheet (Rev. A) | PDF | HTML | 2014/11/17 |
| Application note | No Boost Inductor Design with LM364x for Long-Time Focusing in Camera Module | PDF | HTML | 2022/02/16 | |
| White paper | Common LED Functions and LED Driver Design Considerations | 2020/09/21 | ||
| Application note | LED Flash-Protection Features | 2017/08/23 | ||
| Application note | Using Flash LED Drivers for Infrared (IR) LED Applications | 2017/03/20 | ||
| Application note | Using the LM3643/4/8 in an Inductorless and/or Simplified PCB Routing Configurat | 2016/10/11 | ||
| Technical article | Shrink your LED flash solution | PDF | HTML | 2015/12/10 | |
| EVM User's guide | LM3643EVM User’s Guide | 2014/08/19 |
설계 및 개발
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LM3643EVM — 1.5A 고압측 전류 소스를 지원하는 동기 부스트 듀얼 LED 플래시 드라이버 평가 모듈
The LM3643EVM aids in evaluation of the LM3643 Synchronous Boost Dual LED Flash Driver W/ 1.5A High-Side Current Sources. The 2/4 MHz synchronous boost provides up to 1.5A of total LED current to the dual independently controllable high side current sources. Each current source can (...)
PSPICE-FOR-TI — TI 설계 및 시뮬레이션 툴용 PSpice®
TI 설계 및 시뮬레이션 환경용 PSpice는 기본 제공 라이브러리를 이용해 복잡한 혼합 신호 설계를 시뮬레이션할 수 있습니다. 레이아웃 및 제작에 (...)
| 패키지 | 핀 | CAD 기호, 풋프린트 및 3D 모델 |
|---|---|---|
| DSBGA (YFF) | 12 | Ultra Librarian |
주문 및 품질
- RoHS
- REACH
- 디바이스 마킹
- 납 마감/볼 재질
- MSL 등급/피크 리플로우
- MTBF/FIT 예측
- 물질 성분
- 인증 요약
- 지속적인 신뢰성 모니터링
- 팹 위치
- 조립 위치
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