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TPS62120

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15V, 75mA, 96% efficiency Step-Down Converter with DCS-Control

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Data sheet

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TPS62120

ACTIVE
Data sheet Order now

Product details

Vin (Min) (V) 2 Vin (Max) (V) 15 Vout (Min) (V) 1.2 Vout (Max) (V) 5.5 Iout (Max) (A) 0.075 Iq (Typ) (uA) 11 Switching frequency (Min) (kHz) 800 Switching frequency (Max) (kHz) 800 Features Enable, Light Load Efficiency, Output Discharge, Power Good, Synchronous Rectification Rating Catalog Regulated outputs (#) 1 Control mode Constant on-time (COT), DCS-Control Duty cycle (Max) (%) 100
Vin (Min) (V) 2 Vin (Max) (V) 15 Vout (Min) (V) 1.2 Vout (Max) (V) 5.5 Iout (Max) (A) 0.075 Iq (Typ) (uA) 11 Switching frequency (Min) (kHz) 800 Switching frequency (Max) (kHz) 800 Features Enable, Light Load Efficiency, Output Discharge, Power Good, Synchronous Rectification Rating Catalog Regulated outputs (#) 1 Control mode Constant on-time (COT), DCS-Control Duty cycle (Max) (%) 100
SOT-23 (DCN) 8 8 mm² 2.9 x 2.8
  • Wide Input Voltage Range: 2 V to 15 V
  • Up to 96% Efficiency
  • Power Save Mode With 11-µA Quiescent Current
  • Output Current 75 mA
  • Output Voltage Range: 1.2 V to 5.5 V
  • Up to 800-kHz Switch Frequency
  • Synchronous Converter, No External Rectifier
  • Low Output Ripple Voltage
  • 100% Duty Cycle for Lowest Dropout
  • Small SOT 8-Pin (TPS62120) and 2-mm × 2-mm
    DFN 6-Pin (TPS62122) Package
  • Internal Soft Start
  • Power Good Open Drain Output (TPS62120)
  • Open-Drain Output for Output Discharge
    (TPS62120)
  • 2.5-V Rising and 1.85-V Falling UVLO Thresholds
  • Wide Input Voltage Range: 2 V to 15 V
  • Up to 96% Efficiency
  • Power Save Mode With 11-µA Quiescent Current
  • Output Current 75 mA
  • Output Voltage Range: 1.2 V to 5.5 V
  • Up to 800-kHz Switch Frequency
  • Synchronous Converter, No External Rectifier
  • Low Output Ripple Voltage
  • 100% Duty Cycle for Lowest Dropout
  • Small SOT 8-Pin (TPS62120) and 2-mm × 2-mm
    DFN 6-Pin (TPS62122) Package
  • Internal Soft Start
  • Power Good Open Drain Output (TPS62120)
  • Open-Drain Output for Output Discharge
    (TPS62120)
  • 2.5-V Rising and 1.85-V Falling UVLO Thresholds

The TPS6212x device is a highly efficient synchronous step-down DC-DC converter optimized for low-power applications. The device supports up to 75-mA output current and allows the use of tiny external inductors and capacitors.

The wide operating input voltage range of 2 V to 15 V supports energy harvesting, battery powered and as well 9-V or 12-V line powered applications.

With its advanced hysteretic control scheme, the converter provides power save mode operation. At light loads the converter operates in pulse frequency modulation (PFM) mode and transitions automatically in pulse width modulation (PWM) mode at higher load currents. The power save mode maintains high efficiency over the entire load current range. The hysteretic control scheme is optimized for low output ripple voltage in PFM mode in order to reduce output noise to a minimum. The device consumes only 10-µA quiescent current from VIN in PFM mode operation.

In shutdown mode, the device is turned off.

An open-drain power good output is available in the TPS62120 and indicates once the output voltage is in regulation.

The TPS62120 has an additional SGND pin which is connected to GND during shutdown mode. This output can be used to discharge the output capacitor.

The TPS6212x operates over an free air temperature range of –40°C to 85°C. The TPS62120 is available in a small 8-pin SOT-23 package and the TPS62122 in a 2 mm × 2 mm 6-pin DFN package.

The TPS6212x device is a highly efficient synchronous step-down DC-DC converter optimized for low-power applications. The device supports up to 75-mA output current and allows the use of tiny external inductors and capacitors.

The wide operating input voltage range of 2 V to 15 V supports energy harvesting, battery powered and as well 9-V or 12-V line powered applications.

With its advanced hysteretic control scheme, the converter provides power save mode operation. At light loads the converter operates in pulse frequency modulation (PFM) mode and transitions automatically in pulse width modulation (PWM) mode at higher load currents. The power save mode maintains high efficiency over the entire load current range. The hysteretic control scheme is optimized for low output ripple voltage in PFM mode in order to reduce output noise to a minimum. The device consumes only 10-µA quiescent current from VIN in PFM mode operation.

In shutdown mode, the device is turned off.

An open-drain power good output is available in the TPS62120 and indicates once the output voltage is in regulation.

The TPS62120 has an additional SGND pin which is connected to GND during shutdown mode. This output can be used to discharge the output capacitor.

The TPS6212x operates over an free air temperature range of –40°C to 85°C. The TPS62120 is available in a small 8-pin SOT-23 package and the TPS62122 in a 2 mm × 2 mm 6-pin DFN package.
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Technical documentation

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Type Title Date
* Data sheet TPS6212x 15-V, 75-mA Highly Efficient Buck Converter datasheet (Rev. A) PDF | HTML 31 Jul 2015
Application note Quick Reference Guide To TI Buck Switching DC/DC Application Notes (Rev. B) PDF | HTML 23 May 2022
EVM User's guide TPS62120 Buck Converter Evaluation Module User's Guide (Rev. A) PDF | HTML 10 Jun 2021
Selection guide Buck Converter Quick Reference Guide (Rev. B) 08 Apr 2021
Analog Design Journal Methods of output-voltage adjustment for DC/DC converters 14 Jun 2019
Technical article Minimize the impact of the MLCC shortage on your power application 29 Mar 2019
Application note Performing Accurate PFM Mode Efficiency Measurements (Rev. A) 11 Dec 2018
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Analog Design Journal Understanding 100% mode in low-power DC/DC converters 22 Jun 2018
Analog Design Journal Achieving a clean startup by using a DC/DC converter with a precise enable-pin t 24 Oct 2017
Application note Extending the Soft Start Time Without a Soft Start Pin (Rev. B) 15 Jun 2017
Analog Design Journal Testing tips for applying external power to supply outputs without an input volt 24 Oct 2016
Analog Design Journal Understanding frequency variation in the DCS-Control(TM) topology 30 Oct 2015
Application note Basic Calculation of a Buck Converter's Power Stage (Rev. B) 17 Aug 2015
Analog Design Journal Five steps to a great PCB layout for a step-down converter 29 Jan 2015
Technical article Efficiently Power that Op Amp 18 Jul 2014
Technical article Discharge that output rail? 16 May 2014
Technical article Invert your biased voltage 26 Oct 2013
Application note Using the TPS62120 in an Inverting Buck-Boost Topology (Rev. B) 01 Oct 2013
Analog Design Journal High-efficiency, low-ripple DCS-Control offers seamless PWM/pwr-save transitions 25 Jul 2013
Application note How to Measure the Control Loop of DCS-Control Devices (Rev. A) 09 Aug 2012
Analog Design Journal Design considerations for a resistive feedback divider in a DC/DC converter 26 Apr 2012
White paper Power Management Solutions for Ultra-Low-Power 16-Bit MSP430 MCUs (Rev. D) 28 Mar 2012
Application note Understanding the Absolute Maximum Ratings of the SW Node (Rev. A) 13 Jan 2012
Application note Powering the MSP430 from a High Voltage Input using the TPS62122 (Rev. C) 12 Jan 2012
Application note Choosing an Appropriate Pull-up/Pull-down Resistor for Open Drain Outputs 19 Sep 2011
Analog Design Journal IQ: What it is, what it isn’t, and how to use it 17 Jun 2011

Design & development

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

Evaluation board

TPS62120EVM-640 — TPS62120 Evaluation Module

The TPS62120EVM-640 is a fully assembled and tested platform for evaluating the operation andperformance of the TPS62120 converter. The TPS62120EVM-640 has an input voltage range from 2.0 V up to 15 V, and the output voltage is adjustable with an external feedback divider network in the range of (...)

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Simulation model

TPS62120 PSpice Unencrypted Transient Model (Rev. A)

SLIM216A.ZIP (39 KB) - PSpice Model
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Simulation model

TPS62120 TINA-TI Transient Reference Design

SLVM146.TSC (864 KB) - TINA-TI Reference Design
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Simulation model

TPS62120 TINA-TI Transient Spice Model

SLVM147.ZIP (46 KB) - TINA-TI Spice Model
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Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

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 (...)
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Calculation tool

Design Tool for Output Voltage Adjustment Using a DAC

SLVC780.ZIP (138 KB)
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Reference designs

PMP20080 — 12VDC Input, Hybrid Memory Cube (HMC) Gen. 2 Power Supply Reference Design

The PMP20080 is a powerful design intended to operate 5 output rails with application to a Hybrid Memory Cube (HMC) Gen2. This design uses 5 synchronous bucks with multiple different controllers to allow for a well regulated set of outputs. Also, PMP20080 allows for the configurability that comes (...)
Schematic: PDF
Reference designs

PMP9752 — Small, Simple, and Efficient Voltage Inverter for Op Amp Biasing Reference Design

In this reference design, the TPS62120 provides a small, simple, and efficient voltage inverting circuit to be used for low power negative voltage rails, such as biasing an op amp.  This configuration has been tested with a full test report and operation explanation.
Schematic: PDF
Package Pins Download
SOT-23 (DCN) 8 View options

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