Adjustable, 95% Efficient Boost Converter with 200-mA LDO for 1-Cell LiIon or Dual-Cell Applications


Product details


Vin (Min) (V) 1.8 Vin (Max) (V) 5.5 Vout (Min) (V) 2.5 Vout (Max) (V) 5.5 Switch current limit (Typ) (A) 1.6 Regulated outputs (#) 2 Switching frequency (Min) (kHz) 400 Switching frequency (Max) (kHz) 600 Iq (Typ) (mA) 0.04 Features Enable, Light Load Efficiency, Load Disconnect, Power Good Duty cycle (Max) (%) 100 Operating temperature range (C) -40 to 85 Rating Catalog open-in-new Find other Boost converters (integrated switch)

Package | Pins | Size

TSSOP (PW) 16 22 mm² 4.4 x 5 VQFN (RSA) 16 16 mm² 4 x 4 open-in-new Find other Boost converters (integrated switch)


  • Synchronous, 95% Efficient, Boost Converter With
    500-mA Output Current From 1.8-V Input
  • Integrated 200-mA Reverse Voltage Protected
    LDO for DC-DC Output Voltage Post Regulation
    or Second Output Voltage
  • 40-µA (Typical) Total Device Quiescent Current
  • Input Voltage Range: 1.8 V to 5.5 V
  • Fixed and Adjustable Output Voltage Options up
    to 5.5 V
  • Power Save Mode for Improved Efficiency at Low
    Output Power
  • Low Battery Comparator
  • Power Good Output
  • Low EMI-Converter (Integrated Antiringing Switch)
  • Load Disconnect During Shutdown
  • Overtemperature Protection
  • Available in a Small 4-mm × 4-mm VQFN-16 or in
    a TSSOP-16 Package
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The TPS6112x devices provide a complete power supply solution for products powered by either a one-cell Li-Ion or Li-Polymer by either a one-cell Li-Ion or Li-Polymer battery, or a two- to four-cell Alkaline, NiCd, or NiMH battery. The devices can generate two stable output voltages that are either adjusted by an external resistor divider or are fixed internally on the chip. The device also provides a simple solution for generating 3.3 V out of a one-cell Li-Ion or Li-Polymer battery at a maximum output current of at least 200 mA with supply voltages down to 1.8 V. The implemented boost converter is based on a fixed frequency, pulse-width-modulation (PWM) controller using a synchronous rectifier to obtain maximum efficiency. The maximum peak current in the boost switch is limited to a value of 1600 mA.

The converter can be disabled to minimize battery drain. During shutdown, the load is completely disconnected from the battery. A low-EMI mode is implemented to reduce ringing and, in effect, lower radiated electromagnetic energy when the converter enters discontinuous conduction mode. A power good output at the boost stage simplifies control of any connected circuits like cascaded power supply stages or microprocessors.

The built-in LDO can be used for a second output voltage derived either from the boost output or directly from the battery. The LDO can be enabled separately that is, using the power good of the boost stage. The device is packaged in a 16-pin VQFN (RSA) package measuring 4 mm × 4 mm or in a 16-pin TSSOP (PW) package.

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TPS610982 ACTIVE Low input voltage, 4.3-V output voltage, synchronous boost converter with integrated LDO For applications requiring ultra-low Iq or smaller package.

Technical documentation

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Type Title Date
* Data sheet TPS6112x Synchronous Boost Converter With 1.1-A Switch and Integrated LDO datasheet (Rev. D) May 28, 2015
Application note LDO Noise Demystified (Rev. B) Aug. 18, 2020
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
Selection guide Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Application note Optimizing Transient Response of Internally Compensated DC-DC Converters (Rev. B) Nov. 29, 2017
Application note LDO PSRR Measurement Simplified (Rev. A) Aug. 09, 2017
Application note Extending the Soft Start Time Without a Soft Start Pin (Rev. B) Jun. 15, 2017
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
User guide TPS6112xEVM-205, For Dual Output, Single-Cell Boost Converter User's Guide (Rev. A) Jun. 02, 2008
Application note Minimizing Ringing at the Switch Node of a Boost Converter Sep. 15, 2006

Design & development

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Hardware development

TPS61120 Evaluation Module
document-generic User guide

The TPS61120EVM-205 is an evaluation tool for the TPS61120 inductive boost converter with LDO in 4x4mm2 QFN. The boost stage can supply voltages up to 5.5V from input voltages in the range of 1.8V to 5.5V. The LDO stage can supply voltages down to 0.9V from input voltages in the range of 1.5V to 7V (...)

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CAD/CAE symbols

Package Pins Download
QFN (RSA) 16 View options
TSSOP (PW) 16 View options

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