LM34910

ACTIVE

8-36V, 1.25A Constant On-Time Non-Synchronous Buck Regulator

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Same functionality with different pin-out to the compared device
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Product details

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) 36 Switching frequency (min) (kHz) 50 Switching frequency (max) (kHz) 1000 Features Enable, Over Current Protection Control mode Constant on-time (COT) Vout (min) (V) 2.5 Vout (max) (V) 33 Iq (typ) (µA) 630 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) 36 Switching frequency (min) (kHz) 50 Switching frequency (max) (kHz) 1000 Features Enable, Over Current Protection Control mode Constant on-time (COT) Vout (min) (V) 2.5 Vout (max) (V) 33 Iq (typ) (µA) 630 Duty cycle (max) (%) 97
WSON (DPR) 10 16 mm² 4 x 4
  • Integrated 40V, N-Channel Buck Switch
  • Integrated Start-Up Regulator
  • Input Voltage Range: 8V to 36V
  • No Loop Compensation Required
  • Ultra-Fast Transient Response
  • Operating Frequency Remains Constant with Load Current and Input Voltage
  • Maximum Duty Cycle Limited During Start-Up
  • Adjustable Output Voltage
  • Valley Current Limit At 1.25A
  • Precision Internal Reference
  • Low Bias Current
  • Highly Efficient Operation
  • Thermal Shutdown

All trademarks are the property of their respective owners.

  • Integrated 40V, N-Channel Buck Switch
  • Integrated Start-Up Regulator
  • Input Voltage Range: 8V to 36V
  • No Loop Compensation Required
  • Ultra-Fast Transient Response
  • Operating Frequency Remains Constant with Load Current and Input Voltage
  • Maximum Duty Cycle Limited During Start-Up
  • Adjustable Output Voltage
  • Valley Current Limit At 1.25A
  • Precision Internal Reference
  • Low Bias Current
  • Highly Efficient Operation
  • Thermal Shutdown

All trademarks are the property of their respective owners.

The LM34910 Step Down Switching Regulator features all of the functions needed to implement a low cost, efficient, buck bias regulator capable of supplying 1.25A to the load. This buck regulator contains a 40V N-Channel Buck Switch, and is available in the thermally enhanced WSON-10 package. The hysteretic 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 current limit detection is set at 1.25A. Additional features include: VCC under-voltage lockout, thermal shutdown, gate drive under-voltage lockout, and maximum duty cycle limiter.

The LM34910 Step Down Switching Regulator features all of the functions needed to implement a low cost, efficient, buck bias regulator capable of supplying 1.25A to the load. This buck regulator contains a 40V N-Channel Buck Switch, and is available in the thermally enhanced WSON-10 package. The hysteretic 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 current limit detection is set at 1.25A. Additional features include: VCC under-voltage lockout, thermal shutdown, gate drive under-voltage lockout, and maximum duty cycle limiter.

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Technical documentation

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Type Title Date
* Data sheet LM34910 High Voltage (40V, 1.25A) Step Down Switching Regulator datasheet (Rev. B) 21 Mar 2013
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
EVM User's guide AN-1349 LM34910 Evaluation Board (Rev. A) 25 Apr 2013

Design & development

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Simulation model

LM34910 PSpice Transient Model

SNVM992.ZIP (81 KB) - PSpice Model
Simulation model

LM34910 Unencrypted PSpice Transient Model

SNVM991.ZIP (3 KB) - PSpice Model
Calculation tool

LM34910QUICK-CALC — LM34910 Quick Start Calculator

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WSON (DPR) 10 Ultra Librarian

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