전원 관리 AC/DC 및 DC/DC 컨버터(통합 FET)

LM34914

활성

초소형 1.25A 스텝다운 스위칭 레귤레이터(지능형 전류 제한 지원)

이 제품의 최신 버전이 있습니다

open-in-new 대안 비교
다른 핀 출력을 지원하지만 비교 대상 장치와 동일한 기능
LMR33620 활성 SIMPLE SWITCHER® 3.8V~36V, 2A 동기 벅 컨버터, 초저 EMI Smaller footprint, higher efficiency, lower IQ and lower EMI.

제품 상세 정보

Rating Catalog Operating temperature range (°C) -40 to 125 Topology Buck Type Converter Iout (max) (A) 1.25 Vin (min) (V) 8 Vin (max) (V) 40 Switching frequency (min) (kHz) 50 Switching frequency (max) (kHz) 1300 Features Enable, Over Current Protection Control mode Constant on-time (COT) Vout (min) (V) 2.5 Vout (max) (V) 37 Iq (typ) (µA) 570 Duty cycle (max) (%) 97
Rating Catalog Operating temperature range (°C) -40 to 125 Topology Buck Type Converter Iout (max) (A) 1.25 Vin (min) (V) 8 Vin (max) (V) 40 Switching frequency (min) (kHz) 50 Switching frequency (max) (kHz) 1300 Features Enable, Over Current Protection Control mode Constant on-time (COT) Vout (min) (V) 2.5 Vout (max) (V) 37 Iq (typ) (µA) 570 Duty cycle (max) (%) 97
WSON (DSC) 10 9 mm² 3 x 3
  • Input Voltage Range: 8V to 40V
  • Integrated N-Channel Buck Switch
  • Valley Current Limit Varies with VIN and VOUT to Reduce Excessive Inductor Current
  • On-time is Reduced when in Current Limit
  • Integrated Start-Up Regulator
  • No Loop Compensation Required
  • Ultra-Fast Transient Response
  • Maximum Switching Frequency: 1.3 MHz
  • Operating Frequency Remains Nearly Constant with Load Current and Input Voltage Variations
  • Programmable Soft-Start
  • Precision Internal Reference
  • Adjustable Output Voltage
  • Thermal Shutdown

All trademarks are the property of their respective owners.

  • Input Voltage Range: 8V to 40V
  • Integrated N-Channel Buck Switch
  • Valley Current Limit Varies with VIN and VOUT to Reduce Excessive Inductor Current
  • On-time is Reduced when in Current Limit
  • Integrated Start-Up Regulator
  • No Loop Compensation Required
  • Ultra-Fast Transient Response
  • Maximum Switching Frequency: 1.3 MHz
  • Operating Frequency Remains Nearly Constant with Load Current and Input Voltage Variations
  • Programmable Soft-Start
  • Precision Internal Reference
  • Adjustable Output Voltage
  • Thermal Shutdown

All trademarks are the property of their respective owners.

The LM34914 Step-Down Switching Regulator features all the functions needed to implement a low cost, efficient, buck bias regulator capable of supplying at least 1.25A to the load. To reduce excessive switch current due to the possibility of a saturating inductor the valley current limit threshold changes with input and output voltages, and the on-time is reduced when current limit is detected. This buck regulator contains a 44V N-Channel Buck Switch, and is available in the thermally enhanced 3 mm x 3 mm WSON-10 package. The feedback regulation scheme requires no loop compensation, results in fast load transient response, and simplifies circuit implementation. The operating frequency remains constant with line and load variations due to the inverse relationship between the input voltage and the on-time. The valley current limit results in a smooth transition from constant voltage to constant current mode when current limit is detected, reducing the frequency and output voltage, without the use of foldback. Additional features include: VCC under-voltage lock-out, thermal shutdown, gate drive under-voltage lock-out, and maximum duty cycle limit.

The LM34914 Step-Down Switching Regulator features all the functions needed to implement a low cost, efficient, buck bias regulator capable of supplying at least 1.25A to the load. To reduce excessive switch current due to the possibility of a saturating inductor the valley current limit threshold changes with input and output voltages, and the on-time is reduced when current limit is detected. This buck regulator contains a 44V N-Channel Buck Switch, and is available in the thermally enhanced 3 mm x 3 mm WSON-10 package. The feedback regulation scheme requires no loop compensation, results in fast load transient response, and simplifies circuit implementation. The operating frequency remains constant with line and load variations due to the inverse relationship between the input voltage and the on-time. The valley current limit results in a smooth transition from constant voltage to constant current mode when current limit is detected, reducing the frequency and output voltage, without the use of foldback. Additional features include: VCC under-voltage lock-out, thermal shutdown, gate drive under-voltage lock-out, and maximum duty cycle limit.

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기술 자료

star =TI에서 선정한 이 제품의 인기 문서
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2개 모두 보기
유형 직함 날짜
* Data sheet LM34914 Ultra Small 1.25A Step-Dwn Switching Reg w/Intelligent Current Limit datasheet (Rev. B) 2013/03/21
EVM User's guide AN-1549 LM34914 Evaluation Board (Rev. B) 2013/04/25

설계 및 개발

추가 조건 또는 필수 리소스는 사용 가능한 경우 아래 제목을 클릭하여 세부 정보 페이지를 확인하세요.

시뮬레이션 모델

LM34914 PSpice Transient Model (Rev. A)

SNVM674A.ZIP (96 KB) - PSpice Model
시뮬레이션 모델

LM34914 Unencrypted PSpice Transient Model (Rev. A)

SNVM978A.ZIP (3 KB) - PSpice Model
계산 툴

LM34914QUICK-CALC — LM34914 빠른 시작 계산기

패키지 CAD 기호, 풋프린트 및 3D 모델
WSON (DSC) 10 Ultra Librarian

주문 및 품질

포함된 정보:
  • RoHS
  • REACH
  • 디바이스 마킹
  • 납 마감/볼 재질
  • MSL 등급/피크 리플로우
  • MTBF/FIT 예측
  • 물질 성분
  • 인증 요약
  • 지속적인 신뢰성 모니터링
포함된 정보:
  • 팹 위치
  • 조립 위치

지원 및 교육

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