LM34919C-Q1

ACTIVE

Automotive 4.5-50V Wide Vin 600mA 2.6MHz Ultra-Small Constant On-Time Non-Synchronous Buck Regulator

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Product details

Parameters

Vin (Min) (V) 4.5 Vin (Max) (V) 50 Vout (Min) (V) 2.5 Vout (Max) (V) 45 Iout (Max) (A) 0.6 Iq (Typ) (mA) 2.2 Iq (Typ) (uA) 2200 Switching frequency (Min) (kHz) 50 Switching frequency (Max) (kHz) 2600 Operating temperature range (C) -40 to 125 Rating Automotive Regulated outputs (#) 1 open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

DSBGA (YZR) 12 WSON (DNT) 12 16 mm² 4 x 4 open-in-new Find other Buck converters (integrated switch)

Features

  • AEC-Q100 qualified (Tj = –40°C to 125°C)
  • Maximum Switching Frequency: 2.6 MHz
  • Input Voltage Range: 4.5 V to 50 V
  • Integrated N-Channel buck switch
  • Integrated Start-Up Regulator
  • No Loop Compensation Required
  • Ultra-Fast Transient Response
  • Operating Frequency Remains Constant with
    Load Current and Input Voltage
  • Adjustable Output Voltage
  • Power Good Output
  • Enable Input
  • Valley Current Limit at 0.64 A Typical
  • Precision Internal Voltage Reference
  • Low IQ Shutdown (<10 µA)
  • Highly Efficient Operation
  • Thermal Shutdown
  • 12-Bump 2 mm × 2 mm DSBGA and 12-pin 4
    mm × 4 mm WSON Packages
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Description

The LM34919C Step Down Switching Regulator features all of the functions needed to implement a low-cost, efficient, buck bias regulator capable of supplying 0.6 A to the load. This buck regulator contains an N-Channel Buck Switch and is available in DSBGA and WSON packages. 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: Power Good, enable, VCC undervoltage lockout, thermal shutdown, gate drive undervoltage lockout, and maximum duty cycle limiter.

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Technical documentation

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Type Title Date
* Datasheet LM34919C-Q1 Ultra Small 50V, 600mA Const On-Time Buck Switchg Reg datasheet (Rev. A) Dec. 12, 2013
Technical articles Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
User guides LM34919C Evaluation Board User's Guide Sep. 03, 2013

Design & development

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

Hardware development

EVALUATION BOARDS Download
document-generic User guide
49
Description

The LM34919CQSDEVM 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 4.5V to 50V. The circuit delivers load currents to 600 mA, with (...)

Features
  • 4.5V to 50V input voltage range
  • 3.3V target output voltage
  • Delivers up to 600mA output current
  • Valley current limiting
  • PGD and EN functionality with test points added in the EVM
EVALUATION BOARDS Download
document-generic User guide
49
Description

The LM34919CQTLEVM 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 4.5V to 50V. The circuit delivers load currents to 600 mA, with (...)

Features
  • 4.5V to 50V input voltage range
  • 3.3V target output voltage
  • Delivers up to 600mA output current
  • Valley current limiting
  • PGD and EN functionality with test points added in the EVM

Design tools & simulation

SIMULATION MODELS Download
SNVM638A.ZIP (63 KB) - PSpice Model
SIMULATION MODELS Download
SNVM979A.ZIP (3 KB) - PSpice Model
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
  • (...)

Reference designs

REFERENCE DESIGNS Download
Automotive Audio I2S over Coax Class D Amplifier Reference Design
TIDA-00223 This reference design is an I²S/TDM-based, low-cost, easy-to-use alternative to fiber optics/analog copper wire for connecting an automotive (sound) control panel to an output stage/power amplifier. Supporting I²S as well as TDM, it is capable of transmitting digital audio signal to 16 (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Aptina™ Automotive Camera Module Reference Design
TIDA-00098 The reference design is an automotive camera module solution with Aptina image sensor and processor, and TI FPD-Link III serializer. The module features the AR0132AT 1.2Mp image sensor, the AP0101AT image signal processor (ISP) from Aptina, and the LM34919C, TPS62231 buck regulator and DS90UB913A-Q1 (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Power Solution for Aptina Image Sensor in Automotive Camera Modules Reference Design
PMP9300 The reference design provides a compact power solution (20x20mm board size) for the Aptina AR0132 image sensor in automotive camera modules. The design comes with a power supply board and a filter board. The power board has two sync-buck regulators, LM34919C and TPS62231, to provide 1.8V and 2.8V (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
DSBGA (YZR) 12 View options
WSON (DNT) 12 View options

Ordering & quality

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