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
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

Design & development

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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)

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SON (DSK) 10 View options

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