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TPS65261-1

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

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Data sheet

TPS65261-1

ACTIVE
Data sheet Order now

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, 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, 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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Type Title Date
* 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 TPS65261-1 Buck Converter Evaluation Module User's Guide (Rev. A) PDF | HTML 26 May 2021

Design & development

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Evaluation board

TPS65261-1EVM — TPS65261-1EVM Evaluation Board

The TPS65261-1EVM is a high current, synchronous step down three buck switcher evaluation module. The user's guide document presents the information required to power the TPS65261 PMIC as well as the support documentation including schematic and bill of materials. The TPS65261 PMIC is designed to (...)
User guide: PDF | HTML
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Reference designs

PMP21500 — Compact, triple output 3-A / 2-A / 2-A buck regulator reference design

This reference design is a triple output 3-A/ 2-A / 2-A point-of-load converter in a tiny 0.5" x 0.875" (12.7 mm x 22.2 mm) solution size.  TPS65261-1 fully integrates three 3-A / 2-A / 2-A buck regulators into a small 5mm x 5mm QFN package. It features dedicated enable and soft-start pins, (...)
Test report: PDF
Schematic: PDF
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VQFN (RHB) 32 Ultra Librarian
TI's Standard Terms and Conditions for Evaluation Items apply.

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