1.8-V to 5.5-V, 75-nA IQ buck-boost converter with input current limit and Dynamic Voltage Scaling


Product details


Topology Buck-Boost Vin (Min) (V) 1.8 Vin (Max) (V) 5.5 Vout (Max) (V) 5 Vout (Min) (V) 1.8 Duty cycle (Max) (%) 99 Features Adjustable Current Limit, Dynamic Voltage Scaling, Enable, Light Load Efficiency, Pre-Bias Start-Up, UVLO Fixed Switch current limit (Typ) (A) 1.45 Switching frequency (Min) (kHz) 0.004 Switching frequency (Max) (kHz) 2000 Iq (Typ) (mA) 0.000075 Rating Catalog Iout (Max) (A) 0.4 Operating temperature range (C) -40 to 125 open-in-new Find other Buck-boost, inverting & split-rail converters (integrated switch)

Package | Pins | Size

WSON (DSK) 10 6 mm² 2.5 x 2.5 open-in-new Find other Buck-boost, inverting & split-rail converters (integrated switch)


  • Input voltage range: 1.8 V to 5.5 V
  • Output voltage range: 1.8 V to 5 V (100-mV steps)
    • Programmable with external resistors
    • SEL pin to toggle between two output voltage presets
  • > 400-mA output current for VI ≥ 2.0 V, VO = 3.3 V (typical 1.45-A peak switching current limit)
    • Stackable: parallel multiple devices for higher output current
  • > 90% Efficiency at 10-µA load current
    • 75-nA quiescent current
    • 60-nA shutdown current
  • Single-mode operation
    • Eliminates mode transitions between buck, buck-boost and boost operation
    • Low output ripple
    • Excellent transient performance
  • Safety and robust operation features
    • Integrated soft start
    • Programmable input current limit with eight settings (1 mA to 100 mA and unlimited)
    • Output short-circuit and overtemperature protection
  • Tiny solution size of 21-mm2
    • Small 2.2-µH inductor, single 22-µF output capacitor
    • 10-Pin, 2.5-mm × 2.5-mm, 0.5-mm pitch WSON package

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open-in-new Find other Buck-boost, inverting & split-rail converters (integrated switch)


The TPS63900 device is a high-efficiency synchronous buck-boost converter with an extremely low quiescent current (75 nA typical). The device has 32 user-programmable output voltage settings from 1.8 V to 5 V.

A dynamic voltage-scaling feature lets applications switch between two output voltages during operation; for example, to save power by using a lower system supply voltage during standby operation.

With its wide supply voltage range and programmable input current limit (1 mA to 100 mA and unlimited), the device is ideal for use with a wide range of primary like 3S Alkaline, 1S Li-MnO2 or 1S Li-SOCl2, and secondary battery types.

The high-output current capability supports commonly-used RF standards like sub-1-GHz, BLE, LoRa, wM-Bus, and NB-IoT.

open-in-new Find other Buck-boost, inverting & split-rail converters (integrated switch)
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Technical documentation

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Type Title Date
* Data sheet TPS63900 1.8-V to 5.5-V, 75-nA IQ Buck-boost Converter with Input Current Limit and DVS datasheet (Rev. D) Oct. 20, 2020
White paper 克服低功耗應用中的低 IQ 挑戰 Mar. 11, 2021
White paper 저전력 애플리케이션의 저 IQ 문제점 극복 Mar. 11, 2021
White paper Overcoming Low-IQ Challenges in Low-Power Applications Jan. 07, 2021
Application note 75-nA IQ Buck-Boost Converter in Parallel for Increased Output Current (≥ 2 A) Oct. 14, 2020
Application note Extending Battery Life with Low-Iq and Dynamic Voltage Scaling (Rev. A) Oct. 12, 2020
User guide TPS63900 Evaluation Module User's Guide (Rev. A) Sep. 15, 2020
Technical article 5 best practices to extend battery life in flow meters Aug. 28, 2020
Application note How to Extend Operating Time of a LiSOCl2 Powered System Aug. 06, 2020
Application note How to Implement Multi-Level Dynamic Voltage Scaling With TPS63900 Aug. 06, 2020
Application note Using Input Current Limiting to Extend Battery Life Apr. 28, 2020
Application note Layer Design for Reducing Radiated EMI of DC to DC Buck-Boost Converters Apr. 22, 2020

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 TPS63900EVM is designed to help the users easily evaluate and test the operation and functionality of the TPS63900 buck-boost converter. The EVM operates from 1.8V to 5.5V input voltage. Output currents can go up to 400 mA in buck mode and boost mode. The user can easily evaluate the different (...)

  • User-friendly evaluation kit for TPS63900, 75nA operating Iq buck-boost converter
  • Single-mode operation: no mode transition, low output ripple, excellent transient performance
  • Easy output voltage and input current limit setting via switches
  • >90% efficiency at 10µA load current
  • 1-mm thick 4-layer board (...)

Design tools & simulation

SLVMDC0A.ZIP (103 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
  • (...)
SLVC808A.ZIP (1889 KB)

Reference designs

Low-power option for smart meter wireless module using primary cells reference design
TIDA-010053 — This reference design showcases three different power architectures for smart flow meters with lithium manganese dioxide (LiMnO2) primary batteries and commercial off-the-shelf narrowband modules for Internet of Things (IoT)-related applications. The three power solutions are combined with the (...)
document-generic Schematic document-generic User guide
Wireless ECG, SpO2, PTT and heart rate monitor reference design for medical and consumer wearables
TIDA-01580 — This reference design is a simple, wearable, multi-parameter, patient monitor that uses a single-chip, biosensing front end, AFE4900, for synchronized electrocardiography (ECG) and photoplethysmography (PPG) measurements. The measured data is transferred to a remote location using CC2640R2F (...)
document-generic Schematic document-generic User guide
Wearable, 16-phase multi-sensor SpO2 and heart rate monitor (HRM) reference design with Bluetooth® 5
TIDA-010029 This reference design enables a wearable, optimized saturation of peripheral capillary oxygen (SpO2) and multi-sensor, multi-wavelength optical heart rate monitor (HRM). It uses AFE4420 device, which is a single-chip, bio-sensing front end for photoplethysmography (PPG) measurements. It supports up (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
SON (DSK) 10 View options

Ordering & quality

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