Product details

Vin (Min) (V) 0.9 Vin (Max) (V) 5 Vout (Min) (V) 2.5 Vout (Max) (V) 3.3 Switch current limit (Typ) (A) 1 Regulated outputs (#) 1 Switching frequency (Min) (kHz) 2300 Switching frequency (Max) (kHz) 2300 Iq (Typ) (mA) 0.005 Features Bypass Mode Pass-through Mode Duty cycle (Max) (%) 90 Operating temperature range (C) -40 to 85 Rating Catalog
Vin (Min) (V) 0.9 Vin (Max) (V) 5 Vout (Min) (V) 2.5 Vout (Max) (V) 3.3 Switch current limit (Typ) (A) 1 Regulated outputs (#) 1 Switching frequency (Min) (kHz) 2300 Switching frequency (Max) (kHz) 2300 Iq (Typ) (mA) 0.005 Features Bypass Mode Pass-through Mode Duty cycle (Max) (%) 90 Operating temperature range (C) -40 to 85 Rating Catalog
WSON (DRV) 6 4 mm² 2 x 2
  • Input Voltage Range 0.9V to 5V
  • Startup Voltage 1.5V at 20mA Load
  • Pin Selectable Output Voltages:
    3.3V, 3V, 2.5V
  • 15nA typical Quiescent Current in
    Bypass Mode
  • 5.7µA typical Quiescent Current in
    Boost Mode
  • Bypass Switch from VIN to VOUT
  • IOUT > 200mA at 3.3V VOUT,
    VIN = 1.8V
  • Internal Feedback Divider Disconnect
    (Bypass Mode)
  • Controlled Bypass Transition Prevents
    Reverse Current into Battery
  • Power-Save Mode at Light Loads
  • Overtemperature Protection
  • Redundant Overvoltage Protection
  • Small 2mm × 2mm SON 6-pin package
  • Input Voltage Range 0.9V to 5V
  • Startup Voltage 1.5V at 20mA Load
  • Pin Selectable Output Voltages:
    3.3V, 3V, 2.5V
  • 15nA typical Quiescent Current in
    Bypass Mode
  • 5.7µA typical Quiescent Current in
    Boost Mode
  • Bypass Switch from VIN to VOUT
  • IOUT > 200mA at 3.3V VOUT,
    VIN = 1.8V
  • Internal Feedback Divider Disconnect
    (Bypass Mode)
  • Controlled Bypass Transition Prevents
    Reverse Current into Battery
  • Power-Save Mode at Light Loads
  • Overtemperature Protection
  • Redundant Overvoltage Protection
  • Small 2mm × 2mm SON 6-pin package

The TPS61291 is a boost converter with pin selectable output voltages and an integrated bypass mode. In bypass operation, the device provides a direct path from the input to the system and allows a low power micro controller (MCU) such as the MSP430 to operate directly from a single 3V Li-MnO2 battery or dual alkaline battery cells.

In bypass mode the integrated feedback divider network for boost mode operation is disconnected from the output and the quiescent current consumption drops down to only 15nA (typical).

In boost mode the device provides a minimum output current of 200mA at 3.3V VOUT from 1.8V VIN. The boost mode is used for system components which require a regulated supply voltage and cannot directly operate from the input source. The boost converter is based on a current-mode controller using synchronous rectification to obtain maximum efficiency and consumes typically 5.7µA from the output. During startup of the boost converter, the VSEL pin is read out and the integrated feedback network sets the output voltage to 2.5V, 3V or 3.3V.

Bypass mode or boost mode operation is controlled by the system via the EN/BYP pin.

The device integrates an enhanced bypass mode control to prevent charge, stored in the output capacitor during boost mode operation, from flowing back to the input and charging the battery.

The device is packaged in a small 6-pin SON package (DRV) measuring 2.0mm × 2.0mm × 0.75mm.

The TPS61291 is a boost converter with pin selectable output voltages and an integrated bypass mode. In bypass operation, the device provides a direct path from the input to the system and allows a low power micro controller (MCU) such as the MSP430 to operate directly from a single 3V Li-MnO2 battery or dual alkaline battery cells.

In bypass mode the integrated feedback divider network for boost mode operation is disconnected from the output and the quiescent current consumption drops down to only 15nA (typical).

In boost mode the device provides a minimum output current of 200mA at 3.3V VOUT from 1.8V VIN. The boost mode is used for system components which require a regulated supply voltage and cannot directly operate from the input source. The boost converter is based on a current-mode controller using synchronous rectification to obtain maximum efficiency and consumes typically 5.7µA from the output. During startup of the boost converter, the VSEL pin is read out and the integrated feedback network sets the output voltage to 2.5V, 3V or 3.3V.

Bypass mode or boost mode operation is controlled by the system via the EN/BYP pin.

The device integrates an enhanced bypass mode control to prevent charge, stored in the output capacitor during boost mode operation, from flowing back to the input and charging the battery.

The device is packaged in a small 6-pin SON package (DRV) measuring 2.0mm × 2.0mm × 0.75mm.

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Technical documentation

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Type Title Date
* Data sheet TPS61291 Low Iq Boost Converter with Bypass Operation datasheet (Rev. A) 23 Sep 2014
Application note Performing Accurate PFM Mode Efficiency Measurements (Rev. A) 11 Dec 2018
Application note QFN and SON PCB Attachment (Rev. B) 24 Aug 2018
Application note Extending the Soft Start Time Without a Soft Start Pin (Rev. B) 15 Jun 2017
Application note Calculating and Measuring the No Load Input Current of the Boost Converter 23 Sep 2016
Technical article How to use boost converters in wireless sensor nodes 06 Oct 2015
Technical article How to boost your battery-powered wireless sensor nodes 04 Aug 2015
Technical article Extend the life of your coin cell with boost + bypass operation! 26 Jan 2015
Technical article Make your Smart Meter Smarter 21 Nov 2014
User guide TPS61291EVM-569 Evaluation Module 17 Sep 2014
Analog design journal Accurately measuring efficiency of ultralow-IQ devices 22 Jan 2014
Application note Basic Calculation of a Boost Converter's Power Stage (Rev. C) 08 Jan 2014
Analog design journal IQ: What it is, what it isn’t, and how to use it 17 Jun 2011
Application note Minimizing Ringing at the Switch Node of a Boost Converter 15 Sep 2006

Design & development

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

Evaluation board

TPS61291EVM-569 — Low IQ Boost Converter with Bypass Mode Evaluation Module

The TPS61291EVM-569 facilitates the evaluation of the TPS61291 Low IQ Boost Converter with Bypass Mode device.  The device outputs a user-selectable output voltage of 2.5V, 3V, or 3.3V.  Available output current depends on the input voltage and output voltage but is generally around 200 (...)

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Simulation model

Unencrypted TPS61291 PSpice Transient Model Package (Rev. A)

SLVMAD5A.ZIP (22 KB) - PSpice Model
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 (...)
Gerber file

TPS61291EVM-569 Gerbers

SLVC574.ZIP (176 KB)
リファレンス・デザイン

TIDA-00484 — Humidity & Temp Sensor Node for Sub-1GHz Star Networks Enabling 10+ Year Coin Cell Battery Life

This reference design uses our nano-power system timer, boost converter, SimpleLink™ ultra-low power Sub-1 GHz wireless microcontroller (MCU) platform and humidity sensing technologies to demonstrate an ultra-low power method to duty-cycle sensor end nodes leading to extremely long (...)
リファレンス・デザイン

TIDA-01477 — Humidity & Temperature Sensor Node Reference Design Enabling Sub-1 GHz and Sensor-to-Cloud Networks

This reference design demonstrates how to create an industrial sensor-to-cloud end node capable of connecting to an IoT network gateway and a cloud data provider. This sensor node reference design uses Texas Instruments' nano-power system timer for power gating, low Iq boost converter, (...)
リファレンス・デザイン

TIDA-01469 — Motor Monitoring Using Wireless Vibration Sensor Reference Design Enabling Preventive Maintenance

This reference design is a low-power wireless subsystem solution that monitors motors using vibration sensing to determine if preventative maintenance is necessary. An FFT of the vibration data can be sent out to another device using either Bluetooth low energy or sub-1GHz wireless protocols. The (...)
リファレンス・デザイン

PMP9763 — Smart Meter Power Management Solution with Energy Buffering Reference Design

Smart Wireless Sensors are typically powered by Long-Life Batteries Like LiSoCl2 chemistry which are limited in current. However, these sensors require high current pulses for transmitting the gathered data wirelessly. This Reference Design provides a solution for powering the MCU with reduced (...)
リファレンス・デザイン

TIDM-ULTRASONIC-FLOW-TDC — Ultrasonic Water Flow Meter Design using Time to Digital Conversion

The TIDM-ULTRASONIC-FLOW-TDC is a reference design for an ultrasonic flow meter (water, gas or heat meter) with LCD built using a Time-to-Digital converter and an ultra-low power MCU. Solution includes optimized leakage detection, low power consumption, and a small form factor that are (...)
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WSON (DRV) 6 View options

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