3-A Boost Converter with 0.5-V Ultra Low Input Voltage


Product details


Vin (Min) (V) 0.5 Vin (Max) (V) 4.4 Vout (Min) (V) 1.8 Vout (Max) (V) 4 Switch current limit (Typ) (A) 4.3 Regulated outputs (#) 1 Switching frequency (Min) (kHz) 50 Switching frequency (Max) (kHz) 2000 Iq (Typ) (mA) 0.017 Features Bypass Mode Pass-through Mode, Enable, Light Load Efficiency, Load Disconnect, Synchronous Rectification Duty cycle (Max) (%) 90 Operating temperature range (C) -40 to 125 Rating Catalog open-in-new Find other Boost converters (integrated switch)

Package | Pins | Size

WSON (DSG) 8 4 mm² 2 x 2 open-in-new Find other Boost converters (integrated switch)


  • Input Voltage Range: 0.5 V to 4.4 V
  • 0.9 V Minimum Input Voltage for Startup
  • Output Voltage Setting Range: 1.8 V to 4.0 V
  • 91% Efficiency at VIN = 2.4 V, VOUT = 3.3 V and
    IOUT = 1.5 A
  • 2.0-MHz Switching Frequency
  • IOUT > 1.5 A at VOUT = 3.3 V when VIN > 1.8 V
  • 17-µA Typical Quiescent Current
  • ±2.5% Reference Voltage Accuracy over –40°C to
  • PFM Operation Mode at Light Load
  • True Disconnection Between Input and Output
    During Shutdown
  • Output Over Voltage Protection
  • Output Short Circuit Protection
  • Thermal Shutdown Protection
  • 2-mm × 2-mm WSON Package
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The TPS61021A provides a power supply solution for portable or smart devices powered by alkaline, NiMH, Li-Mn, or Li-ion batteries. The TPS61021A is capable of outputting 3.3-V voltage and 1.5-A current from a battery discharged to as low as 1.8 V. Capable of operating with 0.5-V input voltage enables the TPS61021A to extend the battery run time.

The TPS61021A operates at 2-MHz switching frequency at heavy load and enters power-save mode at light load to maintain high efficiency over the entire load current range. The device only consumes a 17-µA quiescent current from VOUT in light load condition. During shutdown, the load is completely disconnected from the input. In addition, The TPS61021A provides 4.35-V output overvoltage protection, output short circuit protection, and thermal shutdown protection.

The TPS61021A offers a very small solution size due to low count of external components. It allows the use of small inductors and output capacitors with the 2-MHz switching frequency.

The TPS61021A is available in 2.0-mm × 2.0-mm WSON package.

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Technical documentation

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Type Title Date
* Data sheet TPS61021A 3-A Boost Converter with 0.5-V Ultra Low Input Voltage datasheet Jun. 01, 2016
Application note Measuring and Understanding the Output Voltage Ripple of a Boost Converter Feb. 22, 2021
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
Technical article How energy harvesting can extend the life of your fault indicator on the grid Oct. 18, 2017
Application note Single LED Driver in AA Battery-Powered Systems Aug. 25, 2017
Application note Feedforward Capacitor Makes Boost Converter Fast and Stable Nov. 02, 2016
User guide TPS61021A-PWR723 Evaluation Module (Rev. A) Jun. 16, 2016
Application note Basic Calculation of a Boost Converter's Power Stage (Rev. C) Jan. 08, 2014
Application note Design considerations for a resistive feedback divider in a DC/DC converter Apr. 26, 2012
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
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 TPS61021A provides a power supply solution for portable devices and IoT devices powered by alkaline battery or LiMn battery. The TPS61021A supports up to 1.5A load current from a battery discharged as low as 1.8V. The TPS61021A operates at a regulated 2.0-MHz switching frequency and enters (...)
  • 0.9-3.6V input voltage range
  • Up to 90% efficiency at VIN = 2.4V, VOUT = 3.3V, and IOUT = 1.5A
  • 2.0-MHz Switching Frequency
  • 30-µA Quiescent Current
  • True disconnection between input and Output during shut down

Design tools & simulation

SLVMBI5B.ZIP (97 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
  • (...)

Reference designs

Energy Harvesting from Current Transformer with Super Capacitor for Fault Indicator Reference Design
TIDA-01385 — Power management for the energy harvesting, energy buffering and back-up power is a key challenge in the fault indicator design. The TIDA-01385 introduces a circuit about harvesting energy from a current transformer for the system load of a fault indicator while storing the extra energy in a super (...)
document-generic Schematic
Energy Harvesting and Fault Indicator Subsystem for Overhead Fault Indicators Reference Design
TIDA-00998 — This reference design shows multiple architectures for extending primary battery life using a secondary battery or supercapacitor with energy harvested from a current transformer (CT) or solar cells. Optimal power management is done using efficient LED drivers to drive series or parallel (...)
document-generic Schematic
Power Stage Reference Design for Power Stealing Thermostat
TIDA-01574 TIDA-01574 is a reference design for high-efficiency power stealing for smart thermostats and other building automation equipment. In general, power stealing enables to extend battery life of Wi-Fi enabled smart thermostats by drawing power from 24-V AC when the HVAC load is off. This power-stealing (...)
document-generic Schematic
High Brightness Single LED Driver Reference Design for 1- to 2-Cell AA Battery Applications
PMP15037 — This reference design delivers a high efficiency LED driver circuit with dimming function using the boost converter TPS61021A. The PWM dimming method can be used in one or two cell AA battery input applications, and the analog dimming method can be used in one cell AA battery input applications (...)
document-generic Schematic
0.8V-4.2Vin to 3.3V@100mA Boost+Buck Reference Design
PMP21055 — The PMP21055 reference design converts a 0.8V to 4.2V input to a 3.3V/100mA output in a small form factor measuring 12mmx8mm. The design is built on a 2 layer, 1oz board and is a low-cost, small size design intended for battery powered applications. 
document-generic Schematic
Power Supply Reference Design for GPRS Modems using LiSoCL2 Batteries
TIDA-01387 — This design demonstrates how to power GPRS modems in smart meters using LiSoCL2 batteries. GPRS modems require peak current of up to 2A during transmission. This design reduces the peak load requirements on the battery by using the TPS61021A boost converter and a 20F super capacitor to provide the (...)
document-generic Schematic

CAD/CAE symbols

Package Pins Download
WSON (DSG) 8 View options

Ordering & quality

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