전원 관리 AC/DC 및 DC/DC 컨트롤러(외장 FET)

LM25145

활성

넓은 듀티 사이클 범위를 지원하는 6V~42V 동기 벅 DC-DC 컨트롤러

제품 상세 정보

Vin (min) (V) 6 Vin (max) (V) 42 Iout (max) (A) 30 Operating temperature range (°C) -40 to 125 Control mode Voltage mode Topology Buck Controller Rating Catalog Vout (min) (V) 0.8 Vout (max) (V) 40 Features Adjustable current limit, Enable, Frequency synchronization, Light Load Efficiency, Power good, Pre-Bias Start-Up, Synchronous Rectification, Tracking, UVLO adjustable Iq (typ) (µA) 1800 Duty cycle (max) (%) 99 Number of phases 1
Vin (min) (V) 6 Vin (max) (V) 42 Iout (max) (A) 30 Operating temperature range (°C) -40 to 125 Control mode Voltage mode Topology Buck Controller Rating Catalog Vout (min) (V) 0.8 Vout (max) (V) 40 Features Adjustable current limit, Enable, Frequency synchronization, Light Load Efficiency, Power good, Pre-Bias Start-Up, Synchronous Rectification, Tracking, UVLO adjustable Iq (typ) (µA) 1800 Duty cycle (max) (%) 99 Number of phases 1
VQFN (RGY) 20 15.75 mm² 4.5 x 3.5
  • Versatile Synchronous Buck DC-DC Controller
    • Wide Input Voltage Range of 6 V to 42 V
    • Adjustable Output Voltage From 0.8 V to 40 V
  • Meets EN55022 / CISPR 22 EMI Standards
  • Lossless RDS(on) or Shunt Current Sensing
  • Switching Frequency From 100 kHz to 1 MHz
    • SYNC In and SYNC Out Capability
  • 40-ns Minimum On-Time for High VIN / VOUT Ratio
  • 140-ns Minimum Off-Time for Low Dropout
  • 0.8-V Reference With ±1% Feedback Accuracy
  • 7.5-V Gate Drivers for Standard VTH MOSFETs
    • 14-ns Adaptive Dead-Time Control
    • 2.3-A Source and 3.5-A Sink Capability
    • Low-Side Soft-Start for Prebiased Start-Up
  • Adjustable Soft-Start or Optional Voltage Tracking
  • Fast Line and Load Transient Response
    • Voltage-Mode Control With Line Feedforward
    • High Gain-Bandwidth Error Amplifier
  • Precision Enable Input and Open-Drain Power Good Indicator for Sequencing and Control
  • Inherent Protection Features for Robust Design
    • Hiccup Mode Overcurrent Protection
    • Input UVLO With Hysteresis
    • VCC and Gate Drive UVLO Protection
    • Thermal Shutdown Protection With Hysteresis
  • VQFN-20 Package With Wettable Flanks
  • Create a Custom Design Using the LM25145 With WEBENCH® Power Designer
  • Versatile Synchronous Buck DC-DC Controller
    • Wide Input Voltage Range of 6 V to 42 V
    • Adjustable Output Voltage From 0.8 V to 40 V
  • Meets EN55022 / CISPR 22 EMI Standards
  • Lossless RDS(on) or Shunt Current Sensing
  • Switching Frequency From 100 kHz to 1 MHz
    • SYNC In and SYNC Out Capability
  • 40-ns Minimum On-Time for High VIN / VOUT Ratio
  • 140-ns Minimum Off-Time for Low Dropout
  • 0.8-V Reference With ±1% Feedback Accuracy
  • 7.5-V Gate Drivers for Standard VTH MOSFETs
    • 14-ns Adaptive Dead-Time Control
    • 2.3-A Source and 3.5-A Sink Capability
    • Low-Side Soft-Start for Prebiased Start-Up
  • Adjustable Soft-Start or Optional Voltage Tracking
  • Fast Line and Load Transient Response
    • Voltage-Mode Control With Line Feedforward
    • High Gain-Bandwidth Error Amplifier
  • Precision Enable Input and Open-Drain Power Good Indicator for Sequencing and Control
  • Inherent Protection Features for Robust Design
    • Hiccup Mode Overcurrent Protection
    • Input UVLO With Hysteresis
    • VCC and Gate Drive UVLO Protection
    • Thermal Shutdown Protection With Hysteresis
  • VQFN-20 Package With Wettable Flanks
  • Create a Custom Design Using the LM25145 With WEBENCH® Power Designer

The LM25145 42-V synchronous buck controller is designed to regulate from a high input voltage source or from an input rail subject to high voltage transients, minimizing the need for external surge suppression components. A high-side switch minimum on-time of 40 ns facilitates large step-down ratios, enabling the direct step-down conversion from a 24 V nominal input to low-voltage rails for reduced system complexity and solution cost. The LM25145 continues to operate during input voltage dips as low as 6 V, at nearly 100% duty cycle if needed, making it well suited for high-performance industrial control, robotic, datacom, and RF power amplifier applications.

Forced-PWM (FPWM) operation eliminates frequency variation to minimize EMI, while a user-selectable diode emulation feature lowers current consumption at light-load conditions. Cycle-by-cycle overcurrent protection is accomplished by measuring the voltage drop across the low-side MOSFET or by using an optional current sense resistor. The adjustable switching frequency as high as 1 MHz can be synchronized to an external clock source to eliminate beat frequencies in noise-sensitive applications.

The LM25145 voltage-mode controller drives external high-side and low-side N-channel power switches with robust 7.5-V gate drivers suitable for standard-threshold MOSFETs. Adaptively-timed gate drivers with 2.3-A source and 3.5-A sink capability minimize body diode conduction during switching transitions, reducing switching losses and improving thermal performance when driving MOSFETs at high input voltage and high frequency. The LM25145 can be powered from the output of the switching regulator or another available source, further improving efficiency.

A 180° out-of-phase clock output relative to the internal oscillator at SYNCOUT is ideal for cascaded or multi-channel power supplies to reduce input capacitor ripple current and EMI filter size. Additional features of the LM25145 include a configurable soft-start, an open-drain Power Good monitor for fault reporting and output monitoring, monotonic start-up into prebiased loads, integrated VCC bias supply regulator and bootstrap diode, external power supply tracking, precision enable input with hysteresis for adjustable line undervoltage lockout (UVLO), hiccup-mode overload protection, and thermal shutdown protection with automatic recovery.

The LM25145 controller is offered in a 3.5-mm × 4.5-mm thermally-enhanced, 20-pin VQFN package with additional spacing for high-voltage pins and wettable flanks for optical inspection of solder joint fillets.

The LM25145 42-V synchronous buck controller is designed to regulate from a high input voltage source or from an input rail subject to high voltage transients, minimizing the need for external surge suppression components. A high-side switch minimum on-time of 40 ns facilitates large step-down ratios, enabling the direct step-down conversion from a 24 V nominal input to low-voltage rails for reduced system complexity and solution cost. The LM25145 continues to operate during input voltage dips as low as 6 V, at nearly 100% duty cycle if needed, making it well suited for high-performance industrial control, robotic, datacom, and RF power amplifier applications.

Forced-PWM (FPWM) operation eliminates frequency variation to minimize EMI, while a user-selectable diode emulation feature lowers current consumption at light-load conditions. Cycle-by-cycle overcurrent protection is accomplished by measuring the voltage drop across the low-side MOSFET or by using an optional current sense resistor. The adjustable switching frequency as high as 1 MHz can be synchronized to an external clock source to eliminate beat frequencies in noise-sensitive applications.

The LM25145 voltage-mode controller drives external high-side and low-side N-channel power switches with robust 7.5-V gate drivers suitable for standard-threshold MOSFETs. Adaptively-timed gate drivers with 2.3-A source and 3.5-A sink capability minimize body diode conduction during switching transitions, reducing switching losses and improving thermal performance when driving MOSFETs at high input voltage and high frequency. The LM25145 can be powered from the output of the switching regulator or another available source, further improving efficiency.

A 180° out-of-phase clock output relative to the internal oscillator at SYNCOUT is ideal for cascaded or multi-channel power supplies to reduce input capacitor ripple current and EMI filter size. Additional features of the LM25145 include a configurable soft-start, an open-drain Power Good monitor for fault reporting and output monitoring, monotonic start-up into prebiased loads, integrated VCC bias supply regulator and bootstrap diode, external power supply tracking, precision enable input with hysteresis for adjustable line undervoltage lockout (UVLO), hiccup-mode overload protection, and thermal shutdown protection with automatic recovery.

The LM25145 controller is offered in a 3.5-mm × 4.5-mm thermally-enhanced, 20-pin VQFN package with additional spacing for high-voltage pins and wettable flanks for optical inspection of solder joint fillets.

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LM5146 활성 넓은 듀티 사이클 범위를 가진 100V 동기 벅 DC-DC 컨트롤러 Pin-to-pin higher Vin capable

기술 자료

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18개 모두 보기
유형 직함 날짜
* Data sheet LM25145 6-V to 42-V Synchronous Buck DC-DC Controller With Wide Duty Cycle Range datasheet PDF | HTML 2017/06/22
Analog Design Journal Control-Mode Quick Reference Guide (Rev. B) PDF | HTML 2023/08/29
E-book An Engineer’s Guide to Low EMI in DC/DC Regulators 2021/04/21
Selection guide Buck Converter Quick Reference Guide (Rev. B) 2021/04/08
White paper Valuing wide VIN, low EMI synchronous buck circuits for cost-driven, demanding a (Rev. A) 2019/04/10
Application brief Improving RF Power Amplifier Efficiency in 5G Radio Systems 2018/09/05
EVM User's guide LM5146-Q1EVM User's Guide 2018/08/10
Technical article A review of EMI standards, part 2 – radiated emissions PDF | HTML 2018/07/05
Technical article A review of EMI standards, part 1 – conducted emissions PDF | HTML 2018/06/28
White paper An overview of radiated EMI specifications for power supplies 2018/06/05
Selection guide DC/DC Buck Controller Solutions Selection Guide 2018/02/06
White paper An overview of conducted EMI specifications for power supplies 2018/02/01
Application brief Improve DC/DC Regulator EMI for Free with Optimized Power Stage Layout 2017/11/13
Technical article Synchronous buck controller solutions support wide VIN performance and flexibility PDF | HTML 2017/06/29
EVM User's guide LM5145EVM-HD-20A High Density Evaluation Module (Rev. A) 2017/06/07
Analog Design Journal Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics 2016/07/21
Technical article High Density PCB Layout of DC/DC Converters, Part 2 PDF | HTML 2015/09/16
Technical article High Density PCB Layout of DC/DC Converters, Part 1 PDF | HTML 2015/09/12

설계 및 개발

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평가 보드

LM5145EVM-HD-20A — LM5145 넓은 VIN 동기 벅 컨트롤러 고밀도 평가 모듈

The LM5145EVM-HD-20A high density evaluation module (EVM) is designed to showcase the performance of the LM5145 high performance, synchronous buck DC-DC buck controller with wide input voltage range. The design is packaged in a miniature footprint with low component count. It operates over a wide (...)
사용 설명서: PDF
TI.com에서 구매 불가
시뮬레이션 모델

LM25145 PSpice Transient Model (Rev. A)

SNVMBB9A.ZIP (125 KB) - PSpice Model
계산 툴

LM25145DESIGN-CALC LM25145 Synchronous Buck Controller Design Tool

Welcome to the LM25145 Quickstart Design Tool. This standalone tool facilitates and assists the power supply engineer with the design of a DC/DC buck regulator based on the LM25145 42V synchronous buck controller. As such, the user can expeditiously arrive at an optimized design to meet the (...)

지원되는 제품 및 하드웨어

지원되는 제품 및 하드웨어

제품
AC/DC 및 DC/DC 컨트롤러(외장 FET)
LM25145 넓은 듀티 사이클 범위를 지원하는 6V~42V 동기 벅 DC-DC 컨트롤러
하드웨어 개발
평가 보드
LM5145EVM-HD-20A LM5145 넓은 VIN 동기 벅 컨트롤러 고밀도 평가 모듈 LM5146-Q1-EVM12V 동기 벅 컨트롤러 평가 모듈
소프트웨어
계산 툴
LM25145DESIGN-CALC LM25145 동기 벅 컨트롤러 설계 툴
PCB 레이아웃

LM5146-Q1-EVM12V PCB Layout Files

SNVR473.ZIP (7838 KB)
PCB 레이아웃

LM5145EVM-HD-20A PCB Layout Files

SNVR500.ZIP (1493 KB)
패키지 CAD 기호, 풋프린트 및 3D 모델
VQFN (RGY) 20 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

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