The LM25149 is a 42-V, ultra-low IQ synchronous buck DC/DC controller for high-current, single-output applications. The controller uses a peak current-mode control architecture for easy loop compensation, fast transient response, and excellent load and line regulation. The LM25149 can be set up in interleaved dual-phase mode with accurate current sharing for high-current applications. It can operate with VIN as low as 3.5 V, at nearly 100% duty cycle if needed.
The LM25149 has two unique EMI reduction features: active EMI filter and dual random spread spectrum (DRSS). The active EMI filter senses any noise or ripple voltage on the DC input bus and injects an out-of-phase cancellation signal to reduce the disturbance. DRSS combines low-frequency triangular and high-frequency randomized modulations to mitigate EMI across lower and higher frequency bands, respectively. This hybrid technique aligns with the multiple resolution bandwidth (RBW) settings specified in industry-standard EMC tests.
Additional features of the LM25149 include 150°C maximum junction temperature operation, user-selectable diode emulation for lower current consumption at light-load conditions, open-drain power-good flag for fault reporting and output monitoring, precision enable input, monotonic start-up into prebiased load, integrated VCC bias supply regulator and bootstrap diode, internal 3-ms soft-start time, and thermal shutdown protection with automatic recovery.
The LM25149 controller comes in a 3.5-mm × 5.5-mm thermally enhanced, 24-pin VQFN package with an exposed pad to aid in thermal dissapation.
| 유형 | 직함 | 날짜 | ||
|---|---|---|---|---|
| * | Data sheet | LM25149 42-V Synchronous Buck DC/DC Controller with Ultra-Low IQ and Integrated Active EMI Filter datasheet (Rev. B) | PDF | HTML | 2021/12/15 |
| Application note | How to Implement a Simple Constant Current Regulation Scheme to a PCM Based Buck | PDF | HTML | 2023/08/16 | |
| User guide | LM25149-Q1 EVM User's Guide (Rev. A) | PDF | HTML | 2022/04/29 | |
| Functional safety information | LM25149 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA | PDF | HTML | 2021/12/07 | |
| E-book | An Engineer’s Guide to Low EMI in DC/DC Regulators | 2021/04/21 | ||
| Technical article | How to reduce EMI and shrink power-supply size with an integrated active EMI filte | PDF | HTML | 2021/04/05 |
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LM5149-Q1EVM-400 고밀도 평가 모듈(EVM)은 LM5149-Q1 고성능 차량용 동기 벅 DC/DC 벅 컨트롤러의 성능을 보여주도록 설계되었습니다. EVM은 15 V~72V의 넓은 입력 전압 범위에서 작동하여 1% 이상의 설정값 정확도와 최대 8A 출력 전류를 가진 고정 12V 출력을 제공합니다. LM5149-Q1은 고급 EMI 성능, 초저 IQ, 고장 상태 중 레귤레이터 보호를 지원하는 보호 기능을 제공합니다. 여기에는 부족 전압 잠금, 내부 소프트 시작, 히컵 모드 과전류 보호 및 열 셧다운 등이 포함됩니다. 또한 (...)
| 패키지 | 핀 | 다운로드 |
|---|---|---|
| VQFN (RGY) | 24 | 옵션 보기 |