TPS40345

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3-V to 20-V, 25-A, synchronous buck controller for cost-optimized applications

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Product details

Parameters

Vin (Min) (V) 3 Vin (Max) (V) 20 Vout (Min) (V) 0.6 Vout (Max) (V) 18 Iout (Max) (A) 25 Iq (Typ) (uA) 2500 Switching frequency (Min) (kHz) 600 Switching frequency (Max) (kHz) 600 Features Enable, Power Good, Pre-Bias Start-Up, Spread Spectrum, Synchronous Rectification Operating temperature range (C) -20 to 85 Regulated outputs (#) 1 Number of phases 1 Rating Catalog open-in-new Find other Buck controllers (external switch)

Package | Pins | Size

VSON (DRC) 10 9 mm² 3 x 3 open-in-new Find other Buck controllers (external switch)

Features

  • Input Voltage Range From 3 V to 20 V
  • 600-kHz Switching Frequency
  • High- and Low-Side FET RDS(on) Current Sensing
  • Programmable Thermally Compensated OCP Levels
  • Programmable Soft-Start
  • 600-mV, 1.3% Reference Voltage
  • Voltage Feed-Forward Compensation
  • Supports Prebiased Output
  • Frequency Spread Spectrum
  • Thermal Shutdown Protection at 145°C
  • 10-Pin 3-mm × 3-mm VSON Package With Ground Connection to Thermal Pad
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Description

The TPS40345 is a synchronous buck controller that operates from 3-V to 20-V input and which can be used in cost-optimized applications. The controller implements a voltage-mode control architecture with input-voltage feed-forward compensation that responds instantly to a change in input voltage. The switching frequency is fixed at 600 kHz.

The frequency spread spectrum (FSS) feature adds to the switching frequency, significantly reducing the peak EMI noise and making it much easier to comply with EMI standards.

The TPS40345 offers design with a variety of user-programmable functions, including soft-start, overcurrent protection (OCP) levels, and loop compensation.

OCP level may be programmed by a single external resistor connected from the LDRV pin to circuit ground. During initial power on, the TPS40345 enters a calibration cycle, measures the voltage at the LDRV pin, and sets an internal OCP voltage level. During operation, the programmed OCP voltage level is compared to the voltage drop across the low-side FET when it is on to determine whether there is an overcurrent condition. The TPS40345 then enters a shutdown and restart cycle until the fault is removed.

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Technical documentation

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Type Title Date
* Data sheet TPS40345 3-V to 20-V Input Synchronous Buck Controller datasheet Dec. 07, 2017
Application note Maximizing power density and thermal performance in power-module designs Dec. 12, 2018
User guide TPS40345EVM-353 Evaluation Module Dec. 07, 2017

Design & development

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Hardware development

EVALUATION BOARD Download
document-generic User guide
49
Description
The TPS40345EVM-353 evaluation module (EVM) is a synchronous buck converter providing a fixed 1.2-V output at up to 20A from a 12-V input bus.
Features
  • 8-V to 14-V input voltage rating
  • 1.2-V ± 2% output voltage rating
  • 20-A steady state load current
  • 600-kHz switching frequency
  • Simple access to IC features including Power Good, Enable, Soft-Start, and Error Amplifier
  • Convenient test points for simple, non-invasive measurements of converter performance

Design tools & simulation

SIMULATION MODEL Download
SLUM611.ZIP (9 KB) - PSpice Model
SIMULATION MODEL Download
SLUM612.ZIP (85 KB) - PSpice Model
SIMULATION TOOL 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
  • (...)

CAD/CAE symbols

Package Pins Download
VSON (DRC) 10 View options

Ordering & quality

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