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 (Min) (V) 0.8 Vout (Max) (V) 55 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
open-in-new Find other Buck-boost & inverting controllers (external switch)

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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Similar but not functionally equivalent to the compared device:
LM5176 ACTIVE 55V wide VIN synchronous 4-switch buck-boost controller Next generation with improved transition region performance.

Technical documentation

= Featured
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 papers An overview of radiated EMI specifications for power supplies Jun. 05, 2018
User guides LM5175 4-Switch Buck-Boost EVM User Guide (Rev. A) Jun. 04, 2018
White papers 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 notes Designing the front-end DC/DC conversion stage to withstand automotive transient Jan. 18, 2017
White papers Buck-boost converter enables USB Power Delivery on the road Nov. 03, 2016
Application notes Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics Jul. 21, 2016
User guides LM5175RHF (QFN) EVM User Guide Apr. 30, 2016
Application notes Maintaining Output Voltage Regulation During Automotive Cold-Crank with LM5175 B May 26, 2015
User guides LM5175 4-Switch Buck-Boost Converter High Density EVM Mar. 03, 2015
User guides LM5175 Wide VIN 4-Switch Buck-Boost Converter High Power Evaluation Module Feb. 27, 2015
White papers 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 BOARDS Download
document-generic User guide
$199.00
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 BOARDS Download
document-generic User guide
$199.00
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 BOARDS Download
document-generic User guide
$199.00
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 BOARDS Download
document-generic User guide
$149.00
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 BOARDS Download
TPS25740A Evaluation Module
TPS25740AEVM-741
document-generic User guide
$75.00
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 BOARDS Download
document-generic User guide
$75.00
Description
The TPS25740B evaluation module TPS25740BEVM-741 contains evaluation and reference circuitry for the TPS25740B, which is a dedicated USB PD type C downstream facing port (DFP) controller. TPS25740B rely on an upstream converter to output 5V, 9V, 15V, and 20V (TPS25740).  This EVMs uses an (...)
Features
  • TPS25740B Built in IEC 61000-4-2 ESD Protection on CC1 and CC2 pins
  • State-machine implementation requires no firmware
  • Variable output voltage of 5V, 9V, 15V and 20V depending on request. Can also support 5V, 9V, 12V and 15V requests
  • Up to 5A output current with captive cable attached. Default is 3A
  • (...)
EVALUATION BOARDS Download
TPS25740 Evaluation Module
TPS25740EVM-741
document-generic User guide
$75.00
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 MODELS Download
SNVM731C.ZIP (191 KB) - PSpice Model
CALCULATION TOOLS 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 (...)
SCHEMATICS Download
SNVC180A.ZIP (3618 KB)

Reference designs

REFERENCE DESIGNS Download
Variable Outputs Single Cell Battery 80W Heater Element Power Stage Buck Boost Reference Design
PMP20410 — PMP20410 is a synchronous 4-switch buck-boost converter which utilizes the LM5175 controller as a heater element power stage in applications such as E-Cigarettes. The output voltage can be selected from 1V to 10V at 13A to 28A using a trim resistor at the FB pin with a 0.2V to 3.1V bias voltage (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Variable Outputs 2-Cell Battery 200W Heater Element Power Stage Buck Boost Reference Design
PMP20327 — PMP20327 is a synchronous 4-switch buck-boost converter which utilizes the LM5175 controller as a heater element power stage in applications such as E-Cigarettes. The output voltage can be selected from 1V to 10V at 20A to 45A using a trim resistor at the FB pin with a 0.2V to 3.1V bias voltage (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
97% efficiency, 125W, Wide input Synchronous 4-Switch Buck-Boost Battery Charger Reference Design
PMP10594 — PMP10594 is a synchronous 4-switch buck-boost converter reference design which utilizes the LM5175 controller for battery charger applications. The output voltage set point can be adjusted by a PWM signal over the range of 7.1V to 9.2V. I2C programming allows independent control of the average (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
132W 4-Switch Synchronous Buck-Boost CC-CV Supercapacitor Charging Circuit Reference Design
PMP20660 — PMP20660 is a synchronous 4-switch buck-coost converter reference design using the LM5175 controller IC. The converter accepts an input voltage of 5Vin to 13Vin and provides a constant-voltage/constant-current output of 12Vout and approximately 11A. The reference design is built on the (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
60W USB Type C Car Charger Reference Design
PMP20774 — The PMP20774 reference design is a universal USB Type C Charger utilizing the LM5175 DCDC and TPS25740B PD controller for aftermarket car charger applications. This design has a minimum operating input voltage of 6V and a maximum input voltage of 40V. The design is capable of sourcing 3A continuous (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
4-Output USB Type-C 100W Buck Boost Reference Design
PMP20042 PMP20042 is a synchronous 4-switch buck-boost converter which utilizes the LM5175 controller for USB Type-C™ applications. The output voltage can be selected for 5V, 9V, 15V or 20V at 5A using jumpers or open drain control switches. Additional pulse-by-pulse current limiting is inherent (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
16.8V/18A 4 Switch Buck Boost Reference Design
PMP10214 The PMP10214 reference design has a wide input voltage range  from 8 -16V DC with a surge capapbility to 40V. The topology is 4 switch buck boost.  It is best suited for charging 4s Li-Ion starter batteries (4 cells).
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
10V to 32Vin 25Vout at 1A Factory Automation I/O Module Reference Design
PMP20430 — PMP20430 is a 4-switch buck-boost controller utilizing the LM5175 for industrial applications. This design has a minimum operating input voltage of 10V and a maximum input voltage of 32V, supports 25Vout @ 1A.  Switching frequency is set to 600kHz, during buck-boost mode, switching frequency (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Programmable Output 50W 5-20Vout Buck-Boost USB Type-C Car Charger Adapter Reference Design
PMP10726 — PMP10726 is a synchronous 4-switch buck-boost converter which utilizes the LM5175 controller for USB Type-C car charger adapter applications. The output voltage can be selected for 5V, 9V, 15V, or 20V with a maximum output power of 50W by using I2C to adjust the TPL0401A-10 digital potentiometer (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
USB Type-C PD, 5V 3A Out, 3.5-30V Input to Type-A Adaptor and Docking Device Reference Design
PMP20107 — PMP20107 is a 4-switch buck-boost controler utilizing the LM5175 for consumer applications. This design has a minimum operating input voltage of 3.5V after start up and a maximum input voltage of 30V.  Switching frequency is set to 300kHz. A charge pump voltage doubler is added to ensure VCC (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
24W 12Vout for Flash Power in Enterprise SSD Reference Design
PMP20322 — PMP20322 is a 4-switch buck-boost controller utilizing the LM5175 for consumer applications. This design has a minimum operating input voltage of 10V and a maximum input voltage of 14V. The design is capable of sourcing 2A continuous current at 12Vout. Switching frequency is set to 300kHz. PMP20322 (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
USB Type-C PD DFP 5/12/20V3A Output with 2~3 Cell Battery Input Power Bank Reference Design
PMP40001 — PMP40001 is a full featured USB type-C PD DFP reference design. The pure analog configuration for the USB type-C source controller--TPS25740 makes the PD negotiation easy. It supports 3 sets of output voltage options including 5V/12V/20V.  The max output current is 3A which provides a maximal (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
9 to 42Vin 5V/9V/12V @ 3A Synchronous 4-Switch Buck-Boost Converter Reference Design
PMP10624 PMP10624 is a synchronous 4-switch buck-boost converter which utilizes the LM5175 controller for USB type C applications. The output voltage can be selected for 5V, 9V or 12V at 3A using jumpers or open drain control switches. The LM5175 average current loop sets a maximum output current of 4A.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
9 to 42Vin 5V/12V/20V @ 5A Synchronous 4-Switch Buck-Boost Converter Reference Design
PMP10698 PMP10698 is a synchronous 4-switch buck-boost converter which utilizes the LM5175 controller for USB type C applications. The output voltage can be selected for 5V, 12V or 20V at 5A using jumpers or open drain control switches. The LM5175 average current loop sets a maximum output current of 6.25A.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
System Level Power Reference Design for A13 Automotive Wireless Charger Transmitter
PMP10709 PMP10709 is a system optimized 50 W power designs for A13 Wireless Charger Transmitter used in automotive system. The design has various front end automotive protections such as Load dump through TVS (ISO pulse testing), Reverse Voltage (Through PFET’s body diode), Battery Disconnect Switch (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Four-Switch Buck-Boost Converter with Adjustable Output Voltage for Military Radio Applications
PMP10612 The PMP10612 reference design is 4-switch buck-boost converter optimized for military radio applications. The design offers up to 40W output power from 7.5V to 18V input. The design offers an adjustable output voltage range from 5V to 40V, and very low output voltage ripple.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
LM5175 Four Switch Buck Boost Variable Input, Variable Output Design
PMP10507 PMP10507 is configured for 35Vin and was tested at a range of 17 to 54Vout. This design utilizes the LM5175, which is a wide VIN range Single Inductor, four switch synchronous Buck-Boost controller. This design is capable of regulating the output while the input is at, above or below the output. The (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Battery Charger and LED Driver - High Efficiency Synchronous 4 Switch Buck-Boost Topology
PMP9495 PMP9495 is a 72 W four Switch Buck –Boost Design utilizing best in Class Synchronous Buck Boost Converter LM5175.  The design accepts a very Wide input voltage of 6Vin to 33Vin and provides the outputs of 13.4V@5 A for Constant Voltage Output Application, 9V-13.4V @ 5.5A for CC/CV Battery (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
220W Synchronous 4 Switch Buck-Boost Converter
PMP9490 PMP9490 is a 225W four Switch Buck –Boost Design utilizing best in Class Synchronous Buck Boost Converter LM5175.  The design accepts an input voltage of 9.5Vin to 20Vin and provides the outputs of 15V@15 A for Constant Voltage Output Application such as Voltage stabilizer or as Power amplifier SMPS (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

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

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