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, Synchronous Rectification, UVLO Adjustable Iout (Max) (A) 20 Operating temperature range (C) -40 to 125 Rating Catalog
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, Synchronous Rectification, UVLO Adjustable Iout (Max) (A) 20 Operating temperature range (C) -40 to 125 Rating Catalog
HTSSOP (PWP) 28 43 mm² 9.7 x 4.4 VQFN (RHF) 28 20 mm² 5 x 4
  • 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
  • Available in HTSSOP-28 and QFN-28 Packages
  • 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
  • Available in HTSSOP-28 and QFN-28 Packages

The LM5175 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 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 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 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.

The LM5175 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 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 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 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.

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Technical documentation

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Type Title Date
* Data sheet LM5175 42-V Wide VIN Synchronous 4-Switch Buck-Boost Controller datasheet (Rev. A) 02 May 2016
Technical article Adjusting VOUT in USB Type-C™ and wireless charging applications, part 1 10 Feb 2020
Technical article Four-switch buck-boost layout tip No. 4: routing gate-drive and return paths 20 Feb 2019
White paper An overview of radiated EMI specifications for power supplies 05 Jun 2018
User guide LM5175 4-Switch Buck-Boost EVM User Guide (Rev. A) 04 Jun 2018
White paper An overview of conducted EMI specifications for power supplies 01 Feb 2018
Technical article How to approach a power-supply design – part 3 20 Jul 2017
Technical article Buck-boost regulator benefits automotive conducted immunity 02 May 2017
Analog design journal Designing the front-end DC/DC conversion stage to withstand automotive transient 18 Jan 2017
White paper Buck-boost converter enables USB Power Delivery on the road 03 Nov 2016
Analog design journal Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics 21 Jul 2016
User guide LM5175RHF (QFN) EVM User Guide 30 Apr 2016
Application note Maintaining Output Voltage Regulation During Automotive Cold-Crank with LM5175 B 26 May 2015
User guide LM5175 4-Switch Buck-Boost Converter High Density EVM 03 Mar 2015
User guide LM5175 Wide VIN 4-Switch Buck-Boost Converter High Power Evaluation Module 27 Feb 2015
White paper Wide VIN power management ICs simplify white paper (Rev. A) 19 Sep 2013

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

LM5175EVM — LM5175EVM Wide Vin Single Inductor Buck-Boost Controller Evaluation Module

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 (...)

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Evaluation board

LM5175EVM-HD — LM5175EVM-HD Wide VIN 4-Switch Buck-Boost Controller Evaluation Module

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 (...)

Evaluation board

LM5175EVM-HP — LM5175EVM-HP Wide VIN 4-Switch Buck-Boost Converter High Power EVM

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 (...)

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Limit: 5
Evaluation board

LM5175RHFEVM-HD — LM5175RHF Wide VIN 4-Switch Buck-Boost Controller Evaluation Module

The LM5175RHFEVM-HD demonstrates a compact buck-boost design using the LM5175 high performance 4-switch buck-boost controller. This evaluation module is designed to operate from input voltage range of 5.5 V-42 V and provide a regulated 12 V output with  load current up to 6 A.  The high (...)
In stock
Limit: 5
Evaluation board

TPS25740AEVM-741 — TPS25740A Evaluation Module

The TPS25740A evaluation module (TPS25740AEVM-741) contains evaluation and reference circuitry for the TPS25740A, which is a dedicated USB PD type C downstream facing port (DFP) controller.  TPS25740A relies on an upstream converter to output 5V, 9V, and 15V.  This EVM uses an (...)
In stock
Limit: 5
Evaluation board

TPS25740EVM-741 — TPS25740 Evaluation Module

The TPS25740 evaluation module (TPS25740EVM-741) contains evaluation and reference circuitry for the TPS25740, which is a dedicated USB PD type C downstream facing port (DFP) controller.  TPS25740 relies on an upstream converter to output 5V, 12V, and 20V.  This EVM uses an (...)

In stock
Limit: 5
Simulation model

LM5175 PSpice Transient Model (Rev. C)

SNVM731C.ZIP (191 KB) - PSpice Model
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

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 (...)
Calculation tool

LM5175QUICKSTART-CALC — LM5175 quickstart calculator

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 (...)
Schematic

LM5175EVM-HP Design Files (Rev. A)

SNVC180A.ZIP (3618 KB)
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