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LM5175-Q1

ACTIVE

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

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Data sheet

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LM5176-Q1 ACTIVE 55-V wide VIN synchronous 4-switch buck-boost controller, AEC-Q100 qualified Improved version of LM5175-Q1

LM5175-Q1

ACTIVE
Data sheet Order now

Product details

Vin (min) (V) 3.5 Vin (max) (V) 42 Operating temperature range (°C) -40 to 125 Topology Buck-Boost Rating Automotive Vout (min) (V) 0.8 Vout (max) (V) 55 Features Adjustable current limit, Enable, Frequency synchronization, Power good, Pre-Bias Start-Up, Spread Spectrum, Synchronous Rectification, UVLO adjustable Iq (typ) (µA) 1650 Duty cycle (max) (%) 100
Vin (min) (V) 3.5 Vin (max) (V) 42 Operating temperature range (°C) -40 to 125 Topology Buck-Boost Rating Automotive Vout (min) (V) 0.8 Vout (max) (V) 55 Features Adjustable current limit, Enable, Frequency synchronization, Power good, Pre-Bias Start-Up, Spread Spectrum, Synchronous Rectification, UVLO adjustable Iq (typ) (µA) 1650 Duty cycle (max) (%) 100
HTSSOP (PWP) 28 62.08 mm² 9.7 x 6.4
  • Qualified for Automotive Applications
  • AEC-Q100 Qualified with the following results:
    • Device Temperature Grade 1: –40°C to
      +125°C Ambient Operating Temperature
      Range
    • 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
  • Qualified for Automotive Applications
  • AEC-Q100 Qualified with the following results:
    • Device Temperature Grade 1: –40°C to
      +125°C Ambient Operating Temperature
      Range
    • 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

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.

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.
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Type Title Date
* Data sheet LM5175-Q1 42 V Wide VIN Synchronous 4-Switch Buck-Boost Controller datasheet PDF | HTML 11 Apr 2016
White paper Understanding Functional Safety FIT Base Failure Rate Estimates per IEC 62380 and SN 29500 (Rev. A) PDF | HTML 30 Apr 2024
White paper An overview of radiated EMI specifications for power supplies 05 Jun 2018
EVM User's 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 Buck-boost regulator benefits automotive conducted immunity PDF | HTML 02 May 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
Technical article High Density PCB Layout of DC/DC Converters, Part 2 PDF | HTML 16 Sep 2015
Technical article High Density PCB Layout of DC/DC Converters, Part 1 PDF | HTML 12 Sep 2015
EVM User's 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

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