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Buck-boost & inverting controllers (external switch)

LM5176-Q1

ACTIVE

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

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Data sheet

LM5176-Q1

ACTIVE
Data sheet Order now

Product details

Topology Buck-Boost Vin (min) (V) 4.2 Vin (max) (V) 55 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) 2 TI functional safety category Functional Safety-Capable Features Adjustable current limit, Enable, Frequency synchronization, Phase Interleaving, Power good, Pre-Bias Start-Up, Spread Spectrum, Synchronous Rectification, UVLO adjustable Operating temperature range (°C) -40 to 125 Rating Automotive Type Controller
Topology Buck-Boost Vin (min) (V) 4.2 Vin (max) (V) 55 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) 2 TI functional safety category Functional Safety-Capable Features Adjustable current limit, Enable, Frequency synchronization, Phase Interleaving, Power good, Pre-Bias Start-Up, Spread Spectrum, Synchronous Rectification, UVLO adjustable Operating temperature range (°C) -40 to 125 Rating Automotive Type Controller
HTSSOP (PWP) 28 62.08 mm² 9.7 x 6.4
  • AEC-Q100 qualified for automotive applications
    • Temperature grade 1: -40°C to 125°C TA
  • Functional Safety-Capable
  • Single inductor buck-boost controller for step-up/step-down DC/DC conversion
  • Wide VIN: 4.2 V (2.5 V with bias) to 55 V (60 V maximum)
  • Flexible VOUT: 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
  • Available in HTSSOP-28 package
  • Create a custom design using the LM5176-Q1 with the WEBENCH Power Designer
  • AEC-Q100 qualified for automotive applications
    • Temperature grade 1: -40°C to 125°C TA
  • Functional Safety-Capable
  • Single inductor buck-boost controller for step-up/step-down DC/DC conversion
  • Wide VIN: 4.2 V (2.5 V with bias) to 55 V (60 V maximum)
  • Flexible VOUT: 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
  • Available in HTSSOP-28 package
  • Create a custom design using the LM5176-Q1 with the WEBENCH Power Designer

The LM5176-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 LM5176-Q1 operates over a wide input voltage range of 4.2 V to 55 V (60 V absolute maximum) to support a variety of applications.

The LM5176-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 LM5176-Q1 features optional average input or output current limiting, optional spread spectrum to reduce peak EMI, and optional hiccup mode protection in sustained overload conditions.

The LM5176-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 LM5176-Q1 operates over a wide input voltage range of 4.2 V to 55 V (60 V absolute maximum) to support a variety of applications.

The LM5176-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 LM5176-Q1 features 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 LM5176-Q1 55-V Wide VIN Synchronous 4-Switch Buck-Boost Controller datasheet (Rev. B) PDF | HTML 13 Aug 2021
Functional safety information LM5176 and LM5176-Q1 Functional Safety, FIT Rate, Failure FMD 22 May 2020
More literature LM5176 Power Sharing Between Two Parallel, Four-Switch Buck-Boost Converters 16 Jul 2018
More literature An overview of radiated EMI specifications for power supplies 05 Jun 2018
More literature An overview of conducted EMI specifications for power supplies 01 Feb 2018

Design & development

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

Evaluation board

LM5176EVM-HP — LM5176 Wide-VIN Buck-Boost Controller Evaluation Module

The LM5176EVM-HP demonstrates a flexible high power buck-boost design using the LM5176 wide-vin buck-boost controller. The evaluation module is configured to operate from an input voltage range of 6V-36V and to provide a regulated 12-V output with up to 12A of load current.
User guide: PDF
Not available on TI.com
Simulation model

LM5176 PSpice Transient Model (Rev. B)

SNVMBA4B.ZIP (147 KB) - PSpice Model
Download
Calculation tool

LM5176 Design Calculator (Rev. A)

SNVC208A.ZIP (3333 KB)
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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 (...)
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Reference designs

PMP31052 — Automotive, four-switch, >300-W buck-boost reference design

This reference design is an automotive, four-switch, buck-boost converter circuit using the LM5176-Q1 controller IC. The power supply is able to step up and step down the input voltage. The design accepts an input voltage of 4.5 V to 27 V and provides a regulated output of 12 V that can deliver up (...)
Test report: PDF
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HTSSOP (PWP) 28 View options

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