LM34919B-Q1

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Automotive 2x1.75mm, 6-40V Wide Vin, 600mA, 2.6MHz Constant On-Time Non-Synchronous Buck Regulator

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Product details

Parameters

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Package | Pins | Size

DSBGA (YPA) 10 0 mm² 1.788 x 2.021 open-in-new Find other Buck converters (integrated switch)

Features

  • 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
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Description

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
* Datasheet LM34919B Ultra Small 40V, 600 mA Constant On-Time Buck Switching Regulator datasheet (Rev. B) Jul. 02, 2013
Technical articles Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
User guides AN-2016 LM34919B Evaluation Board (Rev. A) Apr. 25, 2013

Design & development

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Hardware development

EVALUATION BOARDS Download
document-generic User guide
25
Description

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 (...)

Design tools & simulation

SIMULATION TOOLS Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — 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 (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
CALCULATION TOOLS Download
LM34919B Quick Start Calculator
LM34919BQUICK-CALC

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Package Pins Download
DSBGA (YPA) 10 View options

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