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Product details

Parameters

Vin (Min) (V) 4.5 Vin (Max) (V) 18 Vout (Min) (V) 0.8 Vout (Max) (V) 17 Iout (Max) (A) 3 Regulated outputs (#) 3 Switching frequency (Min) (kHz) 300 Switching frequency (Max) (kHz) 2200 Features Adjustable Current Limit, Enable, Frequency Synchronization, Phase Interleaving, Power Good, Synchronous Rectification, UVLO Adjustable, Soft Start Adjustable Control mode Current Mode Duty cycle (Max) (%) 100 Type Converter Operating temperature range (C) -40 to 125 Rating Catalog open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

VQFN (RHA) 40 36 mm² 6 x 6 open-in-new Find other Buck converters (integrated switch)

Features

  • Wide Input Supply Voltage Range (4.5 to 18 V)
  • 0.8 V, 1% Accuracy Reference
  • Continuous Loading: 3 A (Buck 1),
    2 A (Buck 2 and 3)
  • Maximum Current: 3.5 A (Buck 1),
    2.5 A (Buck 2 and 3)
  • Adjustable Switching Frequency
    300 kHz to 2.2 MHz Set by External Resistor
  • Dedicated Enable for Each Buck
  • External Synchronization Pin for Oscillator
  • External Enable/Sequencing and Soft-Start Pins
  • Adjustable Current Limit Set By External Resistor
  • Soft-Start Pins
  • Current-Mode Control With Simple Compensation Circuit
  • Powergood
  • Optional Low-Power Mode Operation for Light Loads
  • VQFN Package, 40-Pin 6 mm × 6 mm RHA

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Description

The TPS65251 features three synchronous wide input range high efficiency buck converters. The converters are designed to simplify its application while giving the designer the option to optimize their usage according to the target application.

The converters can operate in 5-, 9-, 12- or 15-V systems and have integrated power transistors. The output voltage can be set externally using a resistor divider to any value between 0.8 V and close to the input supply. Each converter features enable pin that allows a delayed start-up for sequencing purposes, soft-start pin that allows adjustable soft-start time by choosing the soft-start capacitor, and a current limit (RLIMx) pin that enables designer to adjust current limit by selecting an external resistor and optimize the choice of inductor. The current mode control allows a simple RC compensation.

The switching frequency of the converters can either be set with an external resistor connected to ROSC pin or can be synchronized to an external clock connected to SYNC pin if needed. The switching regulators are designed to operate from 300 kHz to 2.2 MHz. 180° out of phase operation between Buck 1 and Buck 2, 3 (Buck 2 and 3 run in phase) minimizes the input filter requirements.

TPS65251 features a supervisor circuit that monitors each converter output. The PGOOD pin is asserted once sequencing is done, all PG signals are reported and a selectable end of reset time lapses. The polarity of the PGOOD signal is active high.

TPS65251 also features a light load pulse skipping mode (PSM) by allowing the LOW_P pin tied to V3V. The PSM mode allows for a reduction on the input power supplied to the system when the host processor is in standby (low-activity) mode.

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Technical documentation

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
$1,299.00
Description

The DLP® LightCrafter™ 4500 development module provides a flexible light steering solution with high brightness and resolution for industrial, medical and scientific applications. DLP LightCrafter 4500 features the 0.45 WXGA chipset and offers a compelling combination of resolution (...)

Features
  • RGB LED light engine with 150L light output
  • Onboard LED Driver with 0-5A LED Driver
  • Simultaneous RGB LED operation
  • High speed pattern display with native DLP4500 resolution (912x1140)
    • Up to 4225 Hz binary pattern rate
    • Up to 120 Hz 8-bit grayscale pattern rate
  • Image or video display up to WXGA resolution (...)
EVALUATION BOARDS Download
document-generic User guide
$8,499.00
Description

 

The DLP NIRscan is a complete evaluation module (EVM) to design a high performance, affordable near-infrared spectrometer.  This flexible tool contains everything a designer needs to start developing a DLP-based spectrometer right out of the box.  The EVM features the DLP 0.45 WXGA NIR (...)

Features

The DLP® NIRscan™ evaluation module includes the key features highlighted below. For mobile sensing, check out the DLP NIRscan Nano evaluation module. The table compares the key specifications of both evaluation modules.

  High Performance EVM MobileSensing EVM
Key Features DLP NIRscan DLP NIRscan Nano
(...)
EVALUATION BOARDS Download
document-generic User guide
$79.00
Description

The TPS65251EVM is a high current, synchronous step down three buck switcher evaluation module. The user’s guide document presents the information required to power the TPS65251 PMIC as well as the support documentation including schematic and bill of materials. The TPS65251 PMIC is designed (...)

Features
  • Wide Input Supply Voltage Range (4.5 V to 18 V)
  • 0.8 V, 1% Accuracy Reference
  • Continuous Loading: 3 A (Buck 1), 2 A (Buck 2 and 3)
  • Maximum Current: 3.5 A (Buck 1), 2.5 A (Buck 2 and 3)
  • Adjustable Switching Frequency, 300 kHz - 2.2 MHz Set By External Resistor
  • Dedicated Enable for Each Buck
  • External (...)

Design tools & simulation

SIMULATION MODELS Download
SLVM274.TSC (94 KB) - TINA-TI Reference Design
SIMULATION MODELS Download
SLVM275.ZIP (8 KB) - TINA-TI Spice Model
SIMULATION MODELS Download
SLVM511A.ZIP (43 KB) - PSpice Model
SIMULATION MODELS Download
SLVM512.TSC (154 KB) - TINA-TI Reference Design
SIMULATION MODELS Download
SLVM513.ZIP (24 KB) - TINA-TI Spice Model
SIMULATION MODELS Download
SLVM519A.ZIP (31 KB) - PSpice Model

Reference designs

REFERENCE DESIGNS Download
High Resolution, Portable Light Steering Reference Design using DLP Technology
DLP4500-C350REF This reference design, featuring the DLP® 0.45” WXGA chipset and implemented in the DLP® LightCrafter™ 4500 evaluation module (EVM), enables flexible control of high resolution, accurate patterns for industrial, medical, and scientific applications. With a free USB-based GUI and (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Accurate Point Cloud Generation for 3D Machine Vision Applications using DLP® Technology
TIDA-00254 The 3D Machine Vision reference design employs Texas Instruments DLP® Advanced Light Control Software Development Kit (SDK) for LightCrafter™ series controllers, which allows developers to easily construct 3D point clouds by integrating TI’s digital micromirror device (DMD (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
DLP Near-Infrared Spectrometer for Optical Analysis of Liquids & Solids Reference Design
TIDA-00155 This near-infrared (NIR) spectrometer reference design utilizes Texas Instruments' DLP technology in conjunction with a single-element InGaAs detector to deliver high performance measurements in a portable form factor that is more affordable than expensive InGaAs array detector or fragile rotating (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Portable, High Brightness HD Projection Display Reference Design using DLP® Technology
TIDA-00782 This reference design, featuring the DLP Pico™ 0.45-inch WXGA display chipset enables use of HD resolution for projection display applications such as accessory projectors, smart projectors, mobile Smart TV, built in projectors like projection functionality inside notebooks, laptops and hot (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
VQFN (RHA) 40 View options

Ordering & quality

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