LM5176-Q1

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

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Product details

Parameters

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

Package | Pins | Size

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

Features

  • 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

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Description

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
* Datasheet LM5176-Q1 55-V Wide VIN Synchronous 4-Switch Buck-Boost Controller datasheet (Rev. A) Jun. 09, 2020
Functional safety information LM5176 and LM5176-Q1 Functional Safety, FIT Rate, Failure FMD May 22, 2020
Technical article Four-switch buck-boost layout tip No. 4: routing gate-drive and return paths Feb. 20, 2019
Application note LM5176 Power Sharing Between Two Parallel, Four-Switch Buck-Boost Converters Jul. 16, 2018
White paper An overview of radiated EMI specifications for power supplies Jun. 05, 2018
White paper An overview of conducted EMI specifications for power supplies Feb. 01, 2018

Design & development

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

Hardware development

EVALUATION BOARD Download
document-generic User guide
199
Description
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.
Features
  • High power design
  • Wide input voltage range of 6V-36V
  • High efficiency, synchronous buck-boost conversion
  • 250 kHz switching frequency
  • Flexible design using standard 5mm x 6mm FETs

Design tools & simulation

SIMULATION MODEL Download
SNVMBA4B.ZIP (147 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
SNVC208.ZIP (3362 KB)

CAD/CAE symbols

Package Pins Download
HTSSOP (PWP) 28 View options

Ordering & quality

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  • MSL rating/Peak reflow
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  • Qualification summary
  • Ongoing reliability monitoring

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