LM25149
- Functional Safety-Capable
- Two integrated EMI mitigation
mechanisms
- Active EMI Filter for enhanced EMI performance at lower frequencies
- Selectable dual random spread spectrum (DRSS) for enhanced EMI performance across low and high-frequency bands
- EMI reduced by an average of 25 dBµV
- Reduces the external differential-mode input filter size by 50% and lowers systems cost
- Optimized for CISPR 32 Class B requirements
- Versatile synchronous buck DC/DC
controller
- Wide input voltage range of 3.5 V to 42 V
- 1% accurate, fixed 3.3-V, 5-V, 12-V, or adjustable output from 0.8 V to 36 V
- 150°C maximum junction temperature
- Shutdown mode current: 2.3 µA
- No-load sleep current: 9.5 µA
- Stackable up to two phases
- Advanced dropout with frequency foldback
- Switching frequency from 100 kHz to 2.2
MHz
- SYNC in and SYNC out capability
- Inherent protection features for robust
design
- Internal hiccup-mode overcurrent protection
- ENABLE and PGOOD functions
- VCC, VDDA, and gate-drive UVLO protection
- Internal or external loop compensation
- Thermal shutdown protection with hysteresis
- Create a custom design using the LM25149 with WEBENCH Power Designer
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.
관심 가지실만한 유사 제품
비교 대상 장치와 동일한 기능을 지원하는 핀 대 핀.
기술 자료
| 상위 문서 | 유형 | 직함 | 형식 옵션 | 최신 영어 버전 다운로드 | 날짜 |
|---|---|---|---|---|---|
| * | 데이터 시트 | 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 | |
| 백서 | Time-Saving and Cost-Effective Innovations for EMI Reduction (Rev. A) | PDF | HTML | 2023. 11. 28 | ||
| 애플리케이션 노트 | How to Implement a Simple Constant Current Regulation Scheme to a PCM Based Buck | PDF | HTML | 2023. 8. 16 | ||
| 기능 안전 정보 | LM25149 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA | PDF | HTML | 2021. 12. 7 | ||
| e북 | An Engineer’s Guide to Low EMI in DC/DC Regulators | 2021. 4. 21 | |||
| 기술 문서 | How to reduce EMI and shrink power-supply size with an integrated active EMI filte | PDF | HTML | 2021. 4. 5 |
설계 및 개발
추가 조건 또는 필수 리소스는 사용 가능한 경우 아래 제목을 클릭하여 세부 정보 페이지를 확인하세요.
LM25149-Q1EVM-2100 — LM25149-Q1 5.5V~36V 저 IQ, 동기형 벅 DC/DC 컨트롤러 평가 모듈
LM5149-Q1EVM-400 — LM5149-Q1 평가 모듈, 72V, 저 IQ, 동기 벅 DC/DC 컨트롤러, 능동 EMI 필터 포함
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 (...)
LM5149-LM25149DESIGN-CALC — AEF 빠른 시작 설계 툴이 포함된 LM5149/-Q1 및 LM25149/-Q1 벅 컨트롤러
| 패키지 | 핀 | CAD 기호, 풋프린트 및 3D 모델 |
|---|---|---|
| VQFN (RGY) | 24 | Ultra Librarian |
주문 및 품질
권장 제품에는 본 TI 제품과 관련된 매개 변수, 평가 모듈 또는 레퍼런스 디자인이 있을 수 있습니다.