LM3281
- Operates from a Single Li-Ion Cell (3 V to 5.5 V)
- 6-MHz (typ.) PWM Switching Frequency
- Fixed Output Voltage: 3.3 V
- Up to 1.2-A Maximum Load Capability
- High Efficiency: 94% (typ.) with 3.8-V VIN at 300 mA
- Analog Bypass: 60-mV (typ.) Drop-Out at 600 mA
- Low IQ: 16 µA typical, 25 µA maximum
- Automatic ECO/PWM/Bypass Mode Change
- Forced PWM Mode for Low Output-Voltage Ripple
- Soft-Start Limits Input Current on Start-Up
- Current Overload Protection
- Thermal Overload Protection
- Small Total Solution Size: < 7.5 mm2
The LM3281 is a high-efficiency low-noise miniature DC-DC converter optimized for powering noise-sensitive wireless connectivity chipsets and RF Front End Modules (FEMs) from a single Lithium-Ion cell. The LM3281 is ideal for “always on” applications with very low unloaded quiescent current of 16 µA (typ.).
The LM3281 steps down an input supply voltage to a fixed output voltage of 3.3 V with output current up to 1200 mA. Five different modes of operation are used to optimize efficiency and minimize battery drain. In Pulse Width Modulation (PWM) mode, the device operates at a fixed frequency of 6 MHz which minimizes RF interference when driving medium-to-heavy loads. At light load, the device automatically enters into Economy (ECO) mode with reduced quiescent current. In a low-battery voltage condition, a bypass mode reduces the voltage dropout to 60 mV (typ.) at 600 mA. If very low output voltage ripple is desired at light loads, the device can also be forced into PWM mode. Shutdown mode turns the device off and reduces battery consumption to 0.1 µA (typ.).
기술 자료
| 상위 문서 | 유형 | 직함 | 형식 옵션 | 최신 영어 버전 다운로드 | 날짜 |
|---|---|---|---|---|---|
| * | 데이터 시트 | LM3281 3.3-V, 1.2-A, 6-MHz Miniature Step-Down DC-DC Converter for Wireless Connectivity Solutions datasheet | PDF | HTML | 2014. 11. 24 |
설계 및 개발
추가 조건 또는 필수 리소스는 사용 가능한 경우 아래 제목을 클릭하여 세부 정보 페이지를 확인하세요.
LM3281EVM — LM3281EVM 아날로그 바이패스를 지원하는 3.3V 미니어처 스텝다운 DC-DC 컨버터
LM3281EVM facilitates the evaluation of the LM3281 1.2A, 3.3V miniature step down DC-DC converter IC. It is a high efficiency low noise buck converter optimized for powering noise-sensitive wireless connectivity chipsets and RF front end modules (FEM). The unique analog bypass feature (...)
TIDA-00532 — WLAN 프론트 엔드 모듈 및 트랜시버용 고효율 저잡음 벅 컨버터 레퍼런스 디자인
TIDA-00532 is a miniature, High Efficiency, low noise power supply for WLAN applications.
TIDA-00718 — CMOS 이미지 센서용 소형, 저잡음 및 고PSRR 전원 레퍼런스 설계
The TIDA-00718 reference design provides a small size and high input voltage ripple rejection power supply to provide a stable and clean voltage source for CMOS image sensors. In this design a main power rail of 5 V from battery, Power over Ethernet (PoE) or DC adaptor is regulated down to three (...)
| 패키지 | 핀 | CAD 기호, 풋프린트 및 3D 모델 |
|---|---|---|
| DSBGA (YFQ) | 6 | Ultra Librarian |
주문 및 품질
권장 제품에는 본 TI 제품과 관련된 매개 변수, 평가 모듈 또는 레퍼런스 디자인이 있을 수 있습니다.