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LM34919B

ACTIVE

2x1.75mm, 6-40V Wide Vin, 600mA, Constant On-Time Non-Synchronous Buck Regulator

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LMR33610 ACTIVE SIMPLE SWITCHER® 3.8-V to 36-V, 1-A synchronous step-down converter in SOIC-8 package Smaller footprint, higher efficiency, lower IQ and lower EMI.

Product details

Vin (min) (V) 6 Vin (max) (V) 40 Vout (min) (V) 2.5 Vout (max) (V) 35 Iout (max) (A) 0.6 Iq (typ) (mA) 0.78 Switching frequency (min) (kHz) 50 Switching frequency (max) (kHz) 2600 Features Enable, Over Current Protection Operating temperature range (°C) -40 to 125 Rating Catalog Regulated outputs (#) 1 Control mode Constant on-time (COT) Duty cycle (max) (%) 99 Type Converter
Vin (min) (V) 6 Vin (max) (V) 40 Vout (min) (V) 2.5 Vout (max) (V) 35 Iout (max) (A) 0.6 Iq (typ) (mA) 0.78 Switching frequency (min) (kHz) 50 Switching frequency (max) (kHz) 2600 Features Enable, Over Current Protection Operating temperature range (°C) -40 to 125 Rating Catalog Regulated outputs (#) 1 Control mode Constant on-time (COT) Duty cycle (max) (%) 99 Type Converter
DSBGA (YPA) 10 3.9375 mm² 2.25 x 1.75
  • AEC-Q100 Grade 1 Qualified
    (–40°C to 125°C)
  • Maximum Switching Frequency: 2.6 MHz
    (VIN=14V,Vo=3.3V)
  • Input Voltage Range: 6V to 40V
  • Integrated N-Channel Buck Switch
  • Integrated Startup Regulator
  • No loop compensation Required
  • Ultra-Fast transient Response
  • Operating frequency remains constant
    with Load Current and Input Voltage
  • Maximum Duty Cycle Limited During Startup
  • Adjustable Output Voltage
  • Valley Current Limit At 0.64A
  • Precision Internal Reference
  • Low Bias Current
  • Highly Efficient Operation
  • Thermal Shutdown
  • 10-Pin DSBGA Package
  • AEC-Q100 Grade 1 Qualified
    (–40°C to 125°C)
  • Maximum Switching Frequency: 2.6 MHz
    (VIN=14V,Vo=3.3V)
  • Input Voltage Range: 6V to 40V
  • Integrated N-Channel Buck Switch
  • Integrated Startup Regulator
  • No loop compensation Required
  • Ultra-Fast transient Response
  • Operating frequency remains constant
    with Load Current and Input Voltage
  • Maximum Duty Cycle Limited During Startup
  • Adjustable Output Voltage
  • Valley Current Limit At 0.64A
  • Precision Internal Reference
  • Low Bias Current
  • Highly Efficient Operation
  • Thermal Shutdown
  • 10-Pin DSBGA Package

The LM34919B Step-Down Switching Regulator features all of the functions needed to implement a low cost, efficient, buck bias regulator capable of supplying 0.6A to the load. This buck regulator contains an N-Channel Buck Switch, and is available in a 10-pin DSBGA package. The constant on-time 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 lockout, thermal shutdown, gate drive under-voltage lockout, and maximum duty cycle limiter.

The LM34919B Step-Down Switching Regulator features all of the functions needed to implement a low cost, efficient, buck bias regulator capable of supplying 0.6A to the load. This buck regulator contains an N-Channel Buck Switch, and is available in a 10-pin DSBGA package. The constant on-time 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 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 LM34919B Ultra Small 40V, 600 mA Constant On-Time Buck Switching Regulator datasheet (Rev. B) 02 Jul 2013
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
EVM User's guide AN-2016 LM34919B Evaluation Board (Rev. A) 25 Apr 2013

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

LM34919BEVAL — LM34919BEVAL Wide Vin Constant On-Time Buck Switching Regulator Evaluation Module

The LM34919BEVAL evaluation board provides the design engineer with a fully functional buck regulator, employing the constant on-time (COT) operating principle. This evaluation board provides a 3.3V output over an input range of 6V to 24V. The circuit delivers load currents to 600 mA, with current (...)

User guide: PDF
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Calculation tool

LM34919BQUICK-CALC — LM34919B Quick Start Calculator

Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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DSBGA (YPA) 10 View options

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