42-V wide VIN 4-switch synchronous buck-boost controller, AEC-Q100 qualified


Product details


Topology Buck-Boost Vin (Min) (V) 3.5 Vin (Max) (V) 42 Vout (Max) (V) 55 Vout (Min) (V) 0.8 Duty cycle (Max) (%) 100 Switching frequency (Min) (kHz) 100 Switching frequency (Max) (kHz) 600 Iq (Typ) (mA) 1.65 Features Adjustable Current Limit, Enable, Frequency Synchronization, Power Good, Pre-Bias Start-Up, Spread Spectrum, Synchronous Rectification, UVLO Adjustable Iout (Max) (A) 20 Operating temperature range (C) -40 to 125 Rating Automotive open-in-new Find other Buck-boost & inverting controllers (external switch)

Package | Pins | Size

HTSSOP (PWP) 28 43 mm² 9.7 x 4.4 open-in-new Find other Buck-boost & inverting controllers (external switch)


  • Qualified for Automotive Applications
  • AEC-Q100 Qualified with the following results:
    • Device Temperature Grade 1: –40°C to
      +125°C Ambient Operating Temperature
    • Device HBM ESD Classification Level 2
    • Device CDM ESD Classification Level C4B
  • Single Inductor Buck-Boost Controller for Step-
    Up/Step-Down DC/DC Conversion
  • Wide VIN Range: 3.5 V to 42 V, 60 V Maximum
  • Flexible VOUT Range: 0.8 V to 55 V
  • VOUT Short Protection
  • High Efficiency Buck-Boost Transition
  • Adjustable Switching Frequency
  • Optional Frequency Sync and Dithering
  • Integrated 2-A MOSFET Gate Drivers
  • Cycle-by-Cycle Current Limit and Optional Hiccup
  • Optional Input or Output Average Current Limiting
  • Programmable Input UVLO and Soft-Start
  • Power Good and Output Overvoltage Protection
  • Selectable CCM or DCM with Pulse Skipping
  • HTSSOP-28 Package
open-in-new Find other Buck-boost & inverting controllers (external switch)


The LM5175-Q1 is a synchronous four-switch buck-boost DC/DC controller capable of regulating the output voltage at, above, or below the input voltage. The LM5175-Q1 operates over a wide input voltage range of 3.5 V to 42 V (60 V maximum) to support a variety of applications.

The LM5175-Q1 employs current-mode control both in buck and boost modes of operation for superior load and line regulation. The switching frequency is programmed by an external resistor and can be synchronized to an external clock signal.

The device also features a programmable soft-start function and offers protection features including cycle-by-cycle current limiting, input undervoltage lockout (UVLO), output overvoltage protection (OVP), and thermal shutdown. In addition, the LM5175-Q1 features selectable Continuous Conduction Mode (CCM) or Discontinuous Conduction Mode (DCM) operation, optional average input or output current limiting, optional spread spectrum to reduce peak EMI, and optional hiccup mode protection in sustained overload conditions.

open-in-new Find other Buck-boost & inverting controllers (external switch)

Technical documentation

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 LM5175EVM is a four-switch non-inverting buck-boost converter based on the LM5175 controller.  This converter is designed to operate with input voltage from 6V to 42V and provide a regulated 12V output for  load current up to 6A.  The high efficiency transition region control (...)

  • Step-up or step-down DC-DC conversion from a 6V to 42V input supply
  • Regulated 12V output with load current rating up to 6A
  • Switching frequency set at 300KHz with optional synchronization to an external clock
  • Hiccup mode fault protection and frequency dithering selectable through test points
  • Optional (...)
document-generic User guide

The LM5175EVM-HD high power density evaluation module (EVM) is a 4-switch synchronous buck-boost DC/DC regulator that employs synchronous rectification to achieve extremely high conversion efficiency in a small footprint at 72W output power.  Operating over a wide input voltage range of 5.5V to (...)

  • High power density: 50mm x 43mm, 6-layer PCB with 2oz copper
  • Wide input voltage range of 5.5V to 42V
  • Extremely high efficiency, synchronous buck/boost conversion with 98.5% peak efficiency
  • Switching frequency of 400kHz with optional synchronization to external clock
  • Low EMI signature with optional (...)
document-generic User guide

The LM5175EVM-HP high power EVM is fully assembled and tested platform for evaluating the operation and performance of the LM5175 4-switch buck-boost controller. The LM5175EVM-HP has an input voltage range from 6V to 36V, the output voltage is set as 12V using an external feedback resistor divider (...)

  • Wide input voltage range from 6V to 36V
  • 12V nominal output voltage and up to 10A output current capability (120W output power)
  • Constant Output Voltage and Constant Output Current Options
  • Optional frequency dithering
  • Optional parallel FET sites provide flexibility to further extend output power (...)

Design tools & simulation

SNVM731C.ZIP (191 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
  • (...)
LM5175 Quickstart Calculator
LM5175QUICKSTART-CALC Welcome to the LM5175 quick-start design tool. This standalone tool facilitates and assists the power supply engineer with design of a DC/DC buck regulator based on the LM5175 buck-boost PWM controller. As such, the user can expeditiously arrive at an optimized design to meet the application (...)
  • Determine filter inductance and input and output filter capacitances
  • Select components for current sensing, soft-start, UVLO, and dither
  • Optimize compensation values and pole/zero placement in terms of current-mode control loop stability using crossover frequency as a performance metric
  • Enter relevant (...)

Reference designs

3.5 to 36 Vin 6.5 Vout @ 1.2-A Synchronous 4-Switch Buck-Boost Converter Reference Design
PMP10708 PMP10708 is a 7.8W 4-switch buck-boost converter using the LM5175 controller IC. The design accepts an input voltage of 3.5Vin to 36Vin and provides an output of 6.5Vout capable of supplying 1.2A of current to the load. The design can operate as low as 3V during start-stop or other line transient (...)
document-generic Schematic

CAD/CAE symbols

Package Pins Download
HTSSOP (PWP) 28 View options

Ordering & quality

Information included:
  • RoHS
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

Recommended products may have parameters, evaluation modules or reference designs related to this TI product.

Support & training

TI E2E™ forums with technical support from TI engineers

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​