TPS65261

ACTIVE

4.5V to 18V Input Voltage, 3A/2A/2A Output Current Triple Synchronous Buck Converter

Product details

Rating Catalog Operating temperature range (°C) -40 to 85 Topology Buck Type Converter Iout (max) (A) 3 Vin (min) (V) 4.5 Vin (max) (V) 18 Switching frequency (min) (kHz) 250 Switching frequency (max) (kHz) 2000 Features Enable, Light Load Efficiency, Power good, Soft Start Adjustable, Synchronous Rectification, UVLO adjustable Control mode current mode Vout (min) (V) 0.6 Iq (typ) (µA) 600 Duty cycle (max) (%) 95
Rating Catalog Operating temperature range (°C) -40 to 85 Topology Buck Type Converter Iout (max) (A) 3 Vin (min) (V) 4.5 Vin (max) (V) 18 Switching frequency (min) (kHz) 250 Switching frequency (max) (kHz) 2000 Features Enable, Light Load Efficiency, Power good, Soft Start Adjustable, Synchronous Rectification, UVLO adjustable Control mode current mode Vout (min) (V) 0.6 Iq (typ) (µA) 600 Duty cycle (max) (%) 95
VQFN (RHB) 32 25 mm² 5 x 5
  • Operating input supply voltage range (4.5 V to 18 V)
  • Feedback reference voltage 0.6 V±1%
  • Maximum continuous output current 3 A/2 A/2 A
  • Adjustable clock frequency from 250 kHz to 2 MHz
  • dedicated enable and soft start pins for each buck
  • Automatic power-up, power-down sequence
  • Pulse Skipping Mode (PSM) at Light Load (TPS65261 only)
  • Output voltage power-good indicator
  • Input voltage power failure indicator
  • Thermal overloading protection
  • Operating input supply voltage range (4.5 V to 18 V)
  • Feedback reference voltage 0.6 V±1%
  • Maximum continuous output current 3 A/2 A/2 A
  • Adjustable clock frequency from 250 kHz to 2 MHz
  • dedicated enable and soft start pins for each buck
  • Automatic power-up, power-down sequence
  • Pulse Skipping Mode (PSM) at Light Load (TPS65261 only)
  • Output voltage power-good indicator
  • Input voltage power failure indicator
  • Thermal overloading protection

The TPS65261, TPS65261-1 is a monolithic triple synchronous step-down (buck) converter with 3-A/2-A/2-A output currents. A wide 4.5-V to 18-V input supply voltage range encompasses the most intermediate bus voltages operating off 5-V, 9-V, 12-V or 15-V power bus. The converter, with constant frequency peak current mode, is designed to simplify its application while giving designers options to optimize the system according to targeted applications. The switching frequency of the converters can be adjusted from 250 kHz to 2 MHz with an external resistor. The 180° out-of-phase operation between Buck1 and Buck2, 3 (Buck2 and 3 run in phase) minimizes the input filter requirements.

The TPS65261, TPS65261-1 features an automatic power sequence with connecting MODE pin to V7V and configuring EN1/2/3 pins. The device also features an open drain RESET signal to monitor power down.

At light load, the TPS65261 automatically operates in pulse skipping mode (PSM) and the TPS65261-1 operates in force continuous current mode (FCC). PSM mode provides high efficiency by reducing switching losses at light loads and FCC mode reduces noise susceptibility and RF interference.

The device features overvoltage protection, overcurrent and short-circuit protection and over-temperature protection. A power-good pin asserts when any output voltages are out of regulation.

The TPS65261, TPS65261-1 is a monolithic triple synchronous step-down (buck) converter with 3-A/2-A/2-A output currents. A wide 4.5-V to 18-V input supply voltage range encompasses the most intermediate bus voltages operating off 5-V, 9-V, 12-V or 15-V power bus. The converter, with constant frequency peak current mode, is designed to simplify its application while giving designers options to optimize the system according to targeted applications. The switching frequency of the converters can be adjusted from 250 kHz to 2 MHz with an external resistor. The 180° out-of-phase operation between Buck1 and Buck2, 3 (Buck2 and 3 run in phase) minimizes the input filter requirements.

The TPS65261, TPS65261-1 features an automatic power sequence with connecting MODE pin to V7V and configuring EN1/2/3 pins. The device also features an open drain RESET signal to monitor power down.

At light load, the TPS65261 automatically operates in pulse skipping mode (PSM) and the TPS65261-1 operates in force continuous current mode (FCC). PSM mode provides high efficiency by reducing switching losses at light loads and FCC mode reduces noise susceptibility and RF interference.

The device features overvoltage protection, overcurrent and short-circuit protection and over-temperature protection. A power-good pin asserts when any output voltages are out of regulation.

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Technical documentation

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* Data sheet TPS6526x 4.5-V to 18-V Input Voltage, 3-A/2-A/2-A Output Current Triple Synchronous Step-Down Converter datasheet (Rev. C) PDF | HTML 10 May 2023
EVM User's guide TPS65261 Buck Converter Evaluation Module User's Guide (Rev. A) PDF | HTML 26 May 2021
Application note Measure Power Stage Gain and Slope Compensation in PCM (Peak Current Mode) BUCK (Rev. A) PDF | HTML 01 Apr 2019
Application note TPS65250/1/2/3 LAYOUT GUIDE 15 Jan 2013

Design & development

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

Evaluation board

TPS65261EVM-650 — TPS65261EVM Evaluation Module

The TPS65261EVM-650 evaluation module (EVM) is a fully assembled and tested circuit for evaluating the TPS65261. The EVM contains input and output connectors as well as control jumpers to ease evaluation of device features.

User guide: PDF | HTML
Not available on TI.com
Simulation model

TPS65261 PSpice Average Model (Rev. A)

SLVM989A.ZIP (386 KB) - PSpice Model
Package Pins CAD symbols, footprints & 3D models
VQFN (RHB) 32 Ultra Librarian

Ordering & quality

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