Low Iq Boost Converter with 15nA Bypass Operation


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 open-in-new Find other Boost converters (integrated switch)

Package | Pins | Size

WSON (DRV) 6 4 mm² 2 x 2 open-in-new Find other Boost converters (integrated switch)


  • 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
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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) Sep. 23, 2014
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
Application note Extending the Soft Start Time Without a Soft Start Pin (Rev. B) Jun. 15, 2017
Application note Calculating and Measuring the No Load Input Current of the Boost Converter Sep. 23, 2016
Technical article How to use boost converters in wireless sensor nodes Oct. 06, 2015
Technical article How to boost your battery-powered wireless sensor nodes Aug. 04, 2015
Technical article Extend the life of your coin cell with boost + bypass operation! Jan. 26, 2015
Technical article Make your Smart Meter Smarter Nov. 21, 2014
User guide TPS61291EVM-569 Evaluation Module Sep. 17, 2014
Application note Accurately measuring efficiency of ultralow-IQ devices Jan. 22, 2014
Application note Basic Calculation of a Boost Converter's Power Stage (Rev. C) Jan. 08, 2014
Application note IQ: What it is, what it isn’t, and how to use it Jun. 17, 2011
Application note Minimizing Ringing at the Switch Node of a Boost Converter Sep. 15, 2006

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

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 mA (...)

  • 5.7 µA IQ
  • 15 nA Bypass Mode
  • 0.9V to 5V Input Voltage Range
  • 2.5V, 3V, or 3.3V Output Voltage
  • 200 mA Output Current at 3.3Vout from a 1.8V Input Voltage

Design tools & simulation

SLVMAD5A.ZIP (22 KB) - PSpice 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
  • (...)
SLVC574.ZIP (176 KB)

Reference designs

Humidity & Temp Sensor Node for Sub-1GHz Star Networks Enabling 10+ Year Coin Cell Battery Life
TIDA-00484 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 (...)
document-generic Schematic
Humidity & Temperature Sensor Node Reference Design Enabling Sub-1 GHz and Sensor-to-Cloud Networks
TIDA-01477 — 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 (...)
document-generic Schematic
Motor Monitoring Using Wireless Vibration Sensor Reference Design Enabling Preventive Maintenance
TIDA-01469 — 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 (...)
document-generic Schematic
Smart Meter Power Management Solution with Energy Buffering Reference Design
PMP9763 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 (...)
document-generic Schematic
Ultrasonic Water Flow Meter Design using Time to Digital Conversion
TIDM-ULTRASONIC-FLOW-TDC 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 (...)
document-generic Schematic

CAD/CAE symbols

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WSON (DRV) 6 View options

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