Startseite Energiemanagement AC/DC- und DC/DC-Wandler (integrierter FET)

LM34914

AKTIV

Extrem kleiner 1,25-A-Abwärtsschaltregler mit intelligenter Strombegrenzung

Eine neuere Version dieses Produkts ist verfügbar

Selbe Funktionalität wie der verglichene Baustein bei abweichender Anschlussbelegung
LMR33620 AKTIV Synchroner SIMPLE SWITCHER®-Abwärtswandler (3,8 bis 36 V, 2A) mit extrem geringer Störaussendung (EM Smaller footprint, higher efficiency, lower IQ and lower EMI.

Produktdetails

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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Technische Dokumentation

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Typ Titel Datum
* Data sheet LM34914 Ultra Small 1.25A Step-Dwn Switching Reg w/Intelligent Current Limit datasheet (Rev. B) 21 Mär 2013
EVM User's guide AN-1549 LM34914 Evaluation Board (Rev. B) 25 Apr 2013

Design und Entwicklung

Weitere Bedingungen oder erforderliche Ressourcen enthält gegebenenfalls die Detailseite, die Sie durch Klicken auf einen der unten stehenden Titel erreichen.

Simulationsmodell

LM34914 PSpice Transient Model (Rev. A)

SNVM674A.ZIP (96 KB) - PSpice Model
Simulationsmodell

LM34914 Unencrypted PSpice Transient Model (Rev. A)

SNVM978A.ZIP (3 KB) - PSpice Model
Berechnungstool

LM34914QUICK-CALC — LM34914 Schnellstart-Rechner

Gehäuse Pins CAD-Symbole, Footprints und 3D-Modelle
WSON (DSC) 10 Ultra Librarian

Bestellen & Qualität

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Beinhaltete Information:
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