LM3645
- Quad independent led current source programmability
- Accurate and programmable LED current range from 0.525 mA to 2 A
- Optimized flash LED current during low battery conditions (IVFM)
- > 85% efficiency in torch mode (at 100 mA) and flash mode (at 1 A to 2 A)
- Grounded cathode LED operation for improved thermal management
- Dual hardware strobe enable (STR1, STR2)
- Synchronization input for RF power amplifier pulse events (TORCH/TX)
- Hardware torch enable (TORCH/Tx)
- Dual remote NTC monitoring (TEMP1, TEMP2)
- Fixed output voltage mode
- 1-MHz I2C-compatible interface
- (I2C Address = 0x65)
The LM3645 is a quad LED flash driver that provides a high level of adjustability within a small solution size. The LM3645 utilizes a synchronous boost converter to provide power to the quad 2A constant current LED sources. The quad 256 level current sources provide the flexibility to adjust the current ratios between LED1, LED2, LED3 and LED4 with each driver capable of delivering a maximum of 2A. An adaptive regulation method ensures the current sources remain in regulation and maximizes efficiency.
Features of the LM3645 are controlled via an I2C-compatible interface. These features include: dual hardware flash pins and a hardware torch or Tx interrupt pin (STR1, STR2 and TORCH/TX), and dual NTC thermistor monitors. The device offers independently programmable currents in each output leg to drive the LEDs in a flash or movie mode (Torch) condition as well as a fast turn-on and turn-off IR Mode.
Two switching frequency options, overvoltage protection (OVP), and adjustable current limit allow for the use of tiny, low-profile inductors and 10µF ceramic capacitors. The device operates over a –40°C to +85°C ambient temperature range.
기술 자료
| 유형 | 직함 | 날짜 | ||
|---|---|---|---|---|
| * | Data sheet | LM3645 Synchronous Boost Quad LED Flash Driver with 2-A High-Side Current Sources datasheet | PDF | HTML | 2024/09/26 |
설계 및 개발
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| 패키지 | 핀 | CAD 기호, 풋프린트 및 3D 모델 |
|---|---|---|
| DSBGA (YCG) | 25 | 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
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