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

LM34923

AKTIV

Abwärts-Schaltregler (Buck), 80 V, 600 mA, konstant aktiv

Eine neuere Version dieses Produkts ist verfügbar

Gleiche Funktionalität, andere Pinbelegung als verglichener Baustein
LMR38010 AKTIV SIMPLE SWITCHER®-Abwärts-Spannungswandler mit 80 V, 1,0 A, 2,2 MHz und 40 μA IQ Smaller footprint, lower EMI, lower IQ, higher efficiency and spread spectrum.

Produktdetails

Rating Catalog Operating temperature range (°C) -40 to 125 Topology Buck Type Converter Iout (max) (A) 0.65 Vin (min) (V) 6 Vin (max) (V) 75 Switching frequency (min) (kHz) 50 Switching frequency (max) (kHz) 800 Features Over Current Protection, Power good Control mode Constant on-time (COT) Vout (min) (V) 2.5 Vout (max) (V) 75 Iq (typ) (µA) 1000 Duty cycle (max) (%) 97
Rating Catalog Operating temperature range (°C) -40 to 125 Topology Buck Type Converter Iout (max) (A) 0.65 Vin (min) (V) 6 Vin (max) (V) 75 Switching frequency (min) (kHz) 50 Switching frequency (max) (kHz) 800 Features Over Current Protection, Power good Control mode Constant on-time (COT) Vout (min) (V) 2.5 Vout (max) (V) 75 Iq (typ) (µA) 1000 Duty cycle (max) (%) 97
VSSOP (DGS) 10 14.7 mm² 3 x 4.9
  • Operating Input Voltage Range: 6V to 75V
  • Integrated 80V, N-Channel Buck Switch
  • Internal Start-up Regulator
  • No Loop Compensation Required
  • Ultra-Fast Transient Response
  • Operating Frequency Remains Constant with Line and Load Variations
  • Adjustable Output voltage From 2.5V
  • Precision Internal Reference, ±2.5%
  • Intelligent Current Limit Reduces Foldback
  • Programmable Input UV Detector with Status Flag Output
  • Pre-charge Switch Enables Bootstrap Gate Drive with No Load
  • Thermal Shutdown
  • 10-Pin VSSOP Package
  • Operating Input Voltage Range: 6V to 75V
  • Integrated 80V, N-Channel Buck Switch
  • Internal Start-up Regulator
  • No Loop Compensation Required
  • Ultra-Fast Transient Response
  • Operating Frequency Remains Constant with Line and Load Variations
  • Adjustable Output voltage From 2.5V
  • Precision Internal Reference, ±2.5%
  • Intelligent Current Limit Reduces Foldback
  • Programmable Input UV Detector with Status Flag Output
  • Pre-charge Switch Enables Bootstrap Gate Drive with No Load
  • Thermal Shutdown
  • 10-Pin VSSOP Package

The LM34923 Step Down Switching Regulator features all of the functions needed to implement a low cost, efficient Buck bias regulator. This high voltage regulator contains an 80V N-Channel MOSFET Switch and a startup regulator. The device is easy to implement and is provided in an 10-pin VSSOP package. The regulator’s control scheme uses an on-time inversely proportional to VIN. This feature results in the operating frequency remaining relatively constant with line and load variations. The control scheme requires no loop compensation, resulting in fast transient response. An intelligent current limit is implemented with a forced off-time which is inversely proportional to VOUT. This scheme ensures short circuit control while providing minimum foldback. Other features include: Thermal Shutdown, VCC Under Voltage Lock-out, Max Duty Cycle Limiter, a Pre-charge Switch, and a programmable Under Voltage Detector with a status flag output.

The LM34923 Step Down Switching Regulator features all of the functions needed to implement a low cost, efficient Buck bias regulator. This high voltage regulator contains an 80V N-Channel MOSFET Switch and a startup regulator. The device is easy to implement and is provided in an 10-pin VSSOP package. The regulator’s control scheme uses an on-time inversely proportional to VIN. This feature results in the operating frequency remaining relatively constant with line and load variations. The control scheme requires no loop compensation, resulting in fast transient response. An intelligent current limit is implemented with a forced off-time which is inversely proportional to VOUT. This scheme ensures short circuit control while providing minimum foldback. Other features include: Thermal Shutdown, VCC Under Voltage Lock-out, Max Duty Cycle Limiter, a Pre-charge Switch, and a programmable Under Voltage Detector with a status flag output.

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Alle anzeigen 5
Typ Titel Datum
* Data sheet LM34923 80V, 600 mA Constant On-Time Buck Switching Regulator datasheet (Rev. A) 20 Feb 2013
White paper Understanding Functional Safety FIT Base Failure Rate Estimates per IEC 62380 and SN 29500 (Rev. A) PDF | HTML 30 Apr 2024
User guide AN-2050 LM5006 Evaluation Board (Rev. A) 25 Apr 2013
User guide AN-2147 LM34923 Evaluation Board (Rev. A) 25 Apr 2013
Application note AN-2171 Designing Constant-On-Time Buck Regulators for Low Drop-Out Voltage (Rev. A) 23 Apr 2013

Design und Entwicklung

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