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LM25116

AKTIV

Synchroner Abwärts-Controller (Buck), 6−42 V, großer Vin-Bereich, Strommodus

Eine neuere Version dieses Produkts ist verfügbar

Selbe Funktionalität wie der verglichene Baustein bei abweichender Anschlussbelegung.
LM25149 AKTIV Synchroner DC/DC-Abwärtscontroller mit 42 V, extrem niedrigem IQ und integriertem aktivem EMI-Filter Active EMI filtering and DRSS reduces EMI by an average of 25 dBµV.

Produktdetails

Rating Catalog Topology Buck Controller Iout (max) (A) 20 Vin (max) (V) 42 Vin (min) (V) 6 Vout (max) (V) 36 Vout (min) (V) 1.215 Control mode current mode Features Adjustable current limit, Enable, Frequency synchronization, Light Load Efficiency, Synchronous Rectification Duty cycle (max) (%) 98 Iq (typ) (A) 0.0046 Number of phases 1 Operating temperature range (°C) -40 to 125
Rating Catalog Topology Buck Controller Iout (max) (A) 20 Vin (max) (V) 42 Vin (min) (V) 6 Vout (max) (V) 36 Vout (min) (V) 1.215 Control mode current mode Features Adjustable current limit, Enable, Frequency synchronization, Light Load Efficiency, Synchronous Rectification Duty cycle (max) (%) 98 Iq (typ) (A) 0.0046 Number of phases 1 Operating temperature range (°C) -40 to 125
HTSSOP (PWP) 20 41.6 mm² (6.5 mm × 6.4 mm)
  • New, similar products available:
    • LM25141 45-V wide input range synchronous buck controller
    • LM5141 65-V wide input range synchronous buck controller
    • LM25148 42-V synchronous buck controller with ultra-low IQ and DRSS
    • LM25149 42-V Synchronous buck controller with ultra-low IQ and AEF
  • Emulated peak current mode
  • Wide operating range (up to 42 V)
  • Low I Q shutdown (< 10 µA)
  • Drives standard or logic level MOSFETs
  • Robust 3.5-A peak gate drive
  • Free-run or synchronous operation to 1 MHz
  • Optional diode emulation mode
  • Programmable output from 1.215 V to 36 V
  • Precision 1.5% voltage reference
  • Programmable current limit
  • Programmable soft start
  • Programmable line undervoltage lockout
  • Automatic switch to external bias supply
  • 20-pin HTSSOP exposed pad
  • Thermal shutdown
  • New, similar products available:
    • LM25141 45-V wide input range synchronous buck controller
    • LM5141 65-V wide input range synchronous buck controller
    • LM25148 42-V synchronous buck controller with ultra-low IQ and DRSS
    • LM25149 42-V Synchronous buck controller with ultra-low IQ and AEF
  • Emulated peak current mode
  • Wide operating range (up to 42 V)
  • Low I Q shutdown (< 10 µA)
  • Drives standard or logic level MOSFETs
  • Robust 3.5-A peak gate drive
  • Free-run or synchronous operation to 1 MHz
  • Optional diode emulation mode
  • Programmable output from 1.215 V to 36 V
  • Precision 1.5% voltage reference
  • Programmable current limit
  • Programmable soft start
  • Programmable line undervoltage lockout
  • Automatic switch to external bias supply
  • 20-pin HTSSOP exposed pad
  • Thermal shutdown

The LM25116 is a synchronous buck controller intended for step-down regulator applications from a high voltage or widely varying input supply. The control method is based upon current mode control using an emulated current ramp. Current mode control provides inherent line feedforward, cycle-by-cycle current limiting and ease of loop compensation. The use of an emulated control ramp reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of very small duty cycles necessary in high input voltage applications. The operating frequency is programmable from 50 kHz to 1 MHz. The LM25116 drives external high-side and low-side NMOS power switches with adaptive dead-time control. A user-selectable diode emulation mode enables discontinuous mode operation for improved efficiency at light load conditions. A low quiescent current shutdown disables the controller and consumes less than 10 µA of total input current. Additional features include a high voltage bias regulator, automatic switch-over to external bias for improved efficiency, thermal shutdown, frequency synchronization, cycle-by-cycle current limit and adjustable line undervoltage lockout. The device is available in a power enhanced 20-pin HTSSOP package featuring an exposed die attach pad to aid thermal dissipation.

New products (LM25141, LM5141, LM25148, and LM25149) offer reduced BOM cost, higher efficiency, and reduced design size among many other features.

The LM25116 is a synchronous buck controller intended for step-down regulator applications from a high voltage or widely varying input supply. The control method is based upon current mode control using an emulated current ramp. Current mode control provides inherent line feedforward, cycle-by-cycle current limiting and ease of loop compensation. The use of an emulated control ramp reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of very small duty cycles necessary in high input voltage applications. The operating frequency is programmable from 50 kHz to 1 MHz. The LM25116 drives external high-side and low-side NMOS power switches with adaptive dead-time control. A user-selectable diode emulation mode enables discontinuous mode operation for improved efficiency at light load conditions. A low quiescent current shutdown disables the controller and consumes less than 10 µA of total input current. Additional features include a high voltage bias regulator, automatic switch-over to external bias for improved efficiency, thermal shutdown, frequency synchronization, cycle-by-cycle current limit and adjustable line undervoltage lockout. The device is available in a power enhanced 20-pin HTSSOP package featuring an exposed die attach pad to aid thermal dissipation.

New products (LM25141, LM5141, LM25148, and LM25149) offer reduced BOM cost, higher efficiency, and reduced design size among many other features.

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Technische Dokumentation

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Top-Dokumentation Typ Titel Format-Optionen Neueste englische Version herunterladen Datum
* Datenblatt LM25116 Wide-Range Synchronous Buck Controller datasheet (Rev. F) PDF | HTML 03.11.2023
Whitepaper Valuing wide VIN, low EMI synchronous buck circuits for cost-driven, demanding a (Rev. A) 10.04.2019
Whitepaper Overcoming Challenges in Designing Step-Dwn Reg Apps w/40V Input Voltage (Rev. A) 03.07.2018
Auswahlhilfe Power Management Guide 2018 (Rev. R) 25.06.2018
Analog Design Journal Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics 21.07.2016
Anwendungshinweis Automated Frequency Response Analyzer 09.10.2013
Anwendungshinweis Minimizing FET Losses For a High Input Rail Buck Converter (Rev. A) 23.04.2013

Design und Entwicklung

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Evaluierungsplatine

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