LM34910 8-36V, 1.25A Constant On-Time Non-Synchronous Buck Regulator | TI.com

LM34910
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8-36V, 1.25A Constant On-Time Non-Synchronous Buck Regulator

 

Description

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.

Features

  • 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

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  Min   Max Range
Vin  V 8.0 to 36.0V
Vout  V 2.5 to 36V
Iout  A ≤ 1A
Ambient Temp  °C -40 to 125°C

Parametrics

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Part number Order Vin (Min) (V) Vin (Max) (V) Vout (Min) (V) Vout (Max) (V) Iout (Max) (A) Regulated outputs (#) Switching frequency (Min) (kHz) Switching frequency (Max) (kHz) Iq (Typ) (mA) Features Control mode Duty cycle (Max) (%) Operating temperature range (C) Rating Package Group Type Package size: mm2:W x L (PKG)
LM34910 Order now 8     36     2.5     33     1.25     1     50     1000     0.63     Enable
Over Current Protection    
Constant on-time (COT)     97     -40 to 125     Catalog     WSON | 10     Converter     10WSON: 16 mm2: 4 x 4 (WSON | 10)    
LM34910C Order now 8     50     2.5     45     1.25     1     50     1000     0.63     Enable
Over Current Protection    
Constant on-time (COT)     97     -40 to 125     Catalog     WSON | 10     Converter     10WSON: 16 mm2: 4 x 4 (WSON | 10)