LM5175

ACTIVE

42V Wide Vin 4-Switch Synchronous Buck-Boost Controller

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Product details

Parameters

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

Package | Pins | Size

HTSSOP (PWP) 28 43 mm² 9.7 x 4.4 VQFN (RHF) 28 20 mm² 5 x 4 open-in-new Find other Buck-boost & inverting controllers (external switch)

Features

  • 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
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Description

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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LM5176 ACTIVE 55V wide VIN synchronous 4-switch buck-boost controller Next generation with improved transition region performance.

Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 16
Type Title Date
* Datasheet LM5175 42-V Wide VIN Synchronous 4-Switch Buck-Boost Controller datasheet (Rev. A) May 02, 2016
Technical articles Adjusting VOUT in USB Type-C™ and wireless charging applications, part 1 Feb. 10, 2020
Technical articles Four-switch buck-boost layout tip No. 4: routing gate-drive and return paths Feb. 20, 2019
White paper An overview of radiated EMI specifications for power supplies Jun. 05, 2018
User guide LM5175 4-Switch Buck-Boost EVM User Guide (Rev. A) Jun. 04, 2018
White paper An overview of conducted EMI specifications for power supplies Feb. 01, 2018
Technical articles How to approach a power-supply design – part 3 Jul. 20, 2017
Technical articles Buck-boost regulator benefits automotive conducted immunity May 02, 2017
Application note Designing the front-end DC/DC conversion stage to withstand automotive transient Jan. 18, 2017
White paper Buck-boost converter enables USB Power Delivery on the road Nov. 03, 2016
Application note Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics Jul. 21, 2016
User guide LM5175RHF (QFN) EVM User Guide Apr. 30, 2016
Application note Maintaining Output Voltage Regulation During Automotive Cold-Crank with LM5175 B May 26, 2015
User guide LM5175 4-Switch Buck-Boost Converter High Density EVM Mar. 03, 2015
User guide LM5175 Wide VIN 4-Switch Buck-Boost Converter High Power Evaluation Module Feb. 27, 2015
White paper Wide VIN power management ICs simplify white paper (Rev. A) Sep. 19, 2013

Design & development

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

Hardware development

EVALUATION BOARD Download
199
Description

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 (...)

Features
  • 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 (...)
EVALUATION BOARD Download
199
Description

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 (...)

Features
  • 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 (...)
EVALUATION BOARD Download
199
Description

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 (...)

Features
  • 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 (...)
EVALUATION BOARD Download
149
Description
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 (...)
Features
  • High power density: 50mm x 43mm, 6-layer PCB with 2oz copper
  • Wide input voltage range of 5.5V to 42V
  • High efficiency, synchronous buck-boost conversion
  • Switching frequency of 400 kHz (adjustable) with optional external synchronization (SYNC)
  • Low EMI signature with optional frequency dithering
EVALUATION BOARD Download
TPS25740A Evaluation Module
TPS25740AEVM-741
75
Description
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 (...)
Features
  • Built in IEC 61000-4-2 Protection on CC1 and CC2 pins
  • Type C PD communication protocol via CC1 and CC2 pins
  • Variable output voltage of 5V, 9V, and 15V depending on request
  • Up to 5A output current for all voltage levels. Default is 3A
  • Smooth transitions between 5V, 9V, and 15V that are compatible with (...)
EVALUATION BOARD Download
TPS25740 Evaluation Module
TPS25740EVM-741
75
Description

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 (...)

Features
  • Built in IEC 61000-4-2 Protection on CC1 and CC2 pins
  • Type C PD communication protocol via CC1 and CC2 pins
  • Variable output voltage of 5V, 12V, and 20V depending on request
  • Up to 5A output current for all voltage levels. Default is 3A
  • Smooth transitions between 5V, 12V, and 20V that are compatible with (...)

Design tools & simulation

SIMULATION MODEL Download
SNVM731C.ZIP (191 KB) - PSpice Model
SIMULATION TOOL Download
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 (...)
Features
  • 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
  • (...)
CALCULATION TOOL Download
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 (...)
Features
  • 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 (...)
SCHEMATIC Download
SNVC180A.ZIP (3618 KB)

Reference designs

Many TI reference designs include the LM5175 Use our reference design selection tool to review and identify designs that best match your application and parameters.

CAD/CAE symbols

Package Pins Download
HTSSOP (PWP) 28 View options
VQFN (RHF) 28 View options

Ordering & quality

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