Step Down Converter with Bypass Mode for Ultra Low Power Wireless Applications


Product details


Vin (Min) (V) 1.9 Vin (Max) (V) 3.9 Vout (Min) (V) 2.1 Vout (Max) (V) 2.1 Iout (Max) (A) 0.1 Iq (Typ) (uA) 25 Switching frequency (Min) (kHz) 3000 Switching frequency (Max) (kHz) 3000 Features Enable, Light Load Efficiency, Synchronous Rectification Operating temperature range (C) -40 to 85 Rating Catalog Regulated outputs (#) 1 open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

USON (DRY) 6 1 mm² 1.5 x 1 open-in-new Find other Buck converters (integrated switch)


  • Input Voltage Range VIN From 1.9 V to 3.9 V
  • Typ. 30-nA Ultra Low-Power Bypass Mode
  • Typ. 25-µA DC-DC Quiescent Current
  • Internal Feedback Divider Disconnect
  • Typical 2.1-Ω: Bypass Switch Between VIN and VOUT
  • Automatic Transition from DC-DC to Bypass Mode
  • Up to 3-MHz Switch Frequency
  • Up to 95% DC-DC Efficiency
  • Open-Drain Status Output STAT
  • Output Peak Current up to 100 mA
  • Fixed Output Voltages 1.9 V, 2.05 V, 2.1 V, 2.3 V
  • Small External Output Filter Components 2.2 µH and 2.2 µF
  • Optimized For Low Output Ripple Voltage
  • Small 1 × 1.5 × 0.6-mm3 USON Package
  • 12-mm2 Minimum Solution Size
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The TPS62730 is a high frequency synchronous step-down DC-DC converter optimized for ultra low-power wireless applications. The device is optimized to supply TI’s Low-Power Wireless sub 1-GHz and 2.4-GHz RF transceivers and System-On-Chip (SoC) solutions. The TPS62730 reduces the current consumption drawn from the battery during TX and RX mode by a high efficient step-down voltage conversion. The device provides an output current of up to 100 mA and allows the use of tiny and low-cost chip inductors and capacitors. With an input voltage range of 1.9 V to 3.9 V, the device supports Li-primary battery chemistries such as Li-SOCl2, Li-SO2, Li-MnO2, and also two cell alkaline batteries.

The TPS62730 features an Ultra Low-Power bypass mode with typical 30-nA current consumption to support sleep and low power modes of TI’s CC2540 Bluetooth Low Energy and CC430 SoC solutions. In this bypass mode, the output capacitor of the DC-DC converter is connected through an integrated typical 2.1-Ω bypass switch to the battery.

In DC-DC operation mode the device provides a fixed output voltage to the system. With a switch frequency up to 3 MHz, the TPS62730 features low output ripple voltage and low noise even with a small 2.2-µF output capacitor. The automatic transition into bypass mode during DC-DC operation prevents an increase of output ripple voltage and noise once the DC-DC converter operates close to 100% duty cycle. The device automatically enters bypass mode once the battery voltage falls below the transition threshold VIT BYP . The TPS62730 is available in a 1 × 1.5-mm2 6-pin USON package.

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Technical documentation

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Type Title Date
* Data sheet TPS6273x Step-Down Converter With Bypass Mode for Ultra Low-Power Wireless Applications datasheet (Rev. D) Dec. 15, 2014
Application note A Topical Index of TI Low Power Buck DC/DC Application Notes (Rev. A) Jun. 25, 2021
Technical article Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
Application note Performing Accurate PFM Mode Efficiency Measurements (Rev. A) Dec. 11, 2018
Application note QFN and SON PCB Attachment (Rev. B) Aug. 24, 2018
Selection guide Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Application note Understanding 100% mode in low-power DC/DC converters Jun. 22, 2018
Application note Achieving a clean startup by using a DC/DC converter with a precise enable-pin t Oct. 24, 2017
Application note Testing tips for applying external power to supply outputs without an input volt Oct. 24, 2016
Technical article European smart grid RF communication in Sub-1 GHz – part 4 May 02, 2016
Application note Understanding frequency variation in the DCS-Control(TM) topology Oct. 30, 2015
Application note Basic Calculation of a Buck Converter's Power Stage (Rev. B) Aug. 17, 2015
Technical article European smart grid RF communication in Sub-1 GHz - part 1 Jun. 18, 2015
Application note Five steps to a great PCB layout for a step-down converter Jan. 29, 2015
White paper Complete Wireless M-Bus Solution (Rev. B) Nov. 05, 2014
Application note High-efficiency, low-ripple DCS-Control offers seamless PWM/pwr-save transitions Jul. 25, 2013
User guide Step down converter with bypass mode (Rev. A) Aug. 21, 2012
Application note How to Measure the Control Loop of DCS-Control Devices (Rev. A) Aug. 09, 2012
Technical article Increasing Efficiency and Design Flexibility for Harvesting Applications with TPS62125 May 25, 2012
Application note AN097 - Current Savings in CC254x Using the TPS62730 (Rev. B) Feb. 08, 2012
Application note Understanding the Absolute Maximum Ratings of the SW Node (Rev. A) Jan. 13, 2012
More literature TPS62730 Product Summary Oct. 05, 2011
Application note Choosing an Appropriate Pull-up/Pull-down Resistor for Open Drain Outputs Sep. 19, 2011
Application note IQ: What it is, what it isn’t, and how to use it Jun. 17, 2011

Design & development

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

Hardware development

document-generic User guide

Stepdown Converters With Bypass Mode for Ultralow-Power Wireless Applications, Evaluation Module/Board

The TPS62730EVM-726 evaluation module (EVM) helps designers evaluate the operation and performance of the TPS62730 step-down converter. The user’s guide describes the TPS62730 evaluation (...)

  • Input Voltage Range V IN from 1.9V to 3.9V
  • Typ. 30nA Ultra Low Power Bypass Mode
  • Typ. 25 µA DC/DC Quiescent Current
  • Internal Feedback Divider Disconnect
  • Typ. 2.5Ω Bypass Switch between V IN and VOUT
  • Automatic Transition from DC/DC to Bypass Mode
  • Up To 3MHz switch frequency
  • Up to 95% DC/DC Efficiency
  • Open (...)

Software development

SimpleLink™ SensorTag Software
SENSORTAG-SW The SensorTag includes an open hardware and software reference design for low cost and low power wireless IoT applications. The SensorTag is supplied with complete source code with everything you need to customize it for your application as well as source code examples for mobile apps.

Design tools & simulation

SLVM229A.ZIP (54 KB) - PSpice Model
SLVM280.TSC (328 KB) - TINA-TI Reference Design
SLVM281.ZIP (35 KB) - TINA-TI Spice Model
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 (...)
  • 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
  • (...)

Reference designs

Multiband (169, 433 and 868MHz) wM-Bus RF sub-system with Segmented LCD Reference Design
TIDC-MULTIBAND-WMBUS The TIDC-MULTIBAND-WMBUS single PCB covers all three wM-Bus frequency bands with only a few component value changes. It is a very low-power and ETSI Cat. 1  Receiver capable RF subsystem for wM-Bus 169MHz and 433 systems without SAW filter and TCXO. Ultralow-power MSP430 with always-on LCD (...)
document-generic Schematic
Bluetooth Low Energy keyboard reference design
TIDM-BLE-KEYBOARD This solution implements a keyboard for any operation system which supports HOGP (Hid Over GATT Profile). It is designed to have ultra low-power consumption for a substantial time working with Bluetooth Low Energy technology. CC2541 and an ultra-low-power MSP MCU are used in this design to handle (...)
document-generic Schematic
ETSI Cat. 1 Receiver-Capable wM-Bus 169MHz RF Subsystem for Smart Gas and Water Meters
TIDC-WMBUS-169MHZ This reference design is a very low-power, ETSI Cat. 1 receiver capable RF subsystem for wM-Bus enabled smart gas and water meters at 169 MHz. It provides market-leading blocking, selectivity, and RX sensitivity numbers for all wM-Bus N-modes as per EN13757-4:2013 and their respective variants (...)
document-generic Schematic
SensorTag with iBeacon™ technology
CC2541-SENSORTAG-IBEACON-RD The SimpleLink Bluetooth® Smart SensorTag removes the barriers to entry for smartphone app developers who want to take advantage of the growing number of Bluetooth® Smart-enabled smartphones and tablets. iBeacon Technology is a very low cost method for providing mobile phones with (...)
document-generic Schematic
ZLL Remote Control Reference Design
CC2530ZLLRC-RD The Texas Instruments ZLLRC Reference Design allows simple and direct control of lamps on a ZigBee Light Link network. It is intended to control a sub-group of lamps on the network, such as the lamps in a room in your house. It creates its own group consisting of the lamps it has touch linked with (...)
document-generic Schematic document-generic User guide
CC2541 SensorTag Reference Design
CC2541SENSORTAG-RD The Bluetooth® low energy SensorTag from TI is designed to shorten the design time for Bluetooth app development from months to hours. The SensorTag is the first Bluetooth low energy development kit focusing on sensor applications and it is the only kit also targeting smartphone app developers.

With a (...)

document-generic Schematic document-generic User guide
CC2541 Keyfob Reference Design
CC2541KEYFOB-RD The Bluetooth Smart Keyfob is a small-form factor, coin-cell powered mobile accessory with buttons, buzzer, LEDs and accelerometer, demonstrating the use of several of the BLE GATT service profiles, like the  proximity and battery service profiles.
document-generic Schematic

CAD/CAE symbols

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