30-V automotive wide VIN synchronous four-switch buck-boost controller


Product details


Topology Buck-Boost Vin (Min) (V) 4.2 Vin (Max) (V) 30 Vout (Min) (V) 0.8 Vout (Max) (V) 30 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, Power Good, Pre-Bias Start-Up, 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)


  • AEC-Q100 Qualified for Automotive Applications
    • Temperature Grade 1: –40°C to 125°C TA
  • Single Inductor Buck-Boost Controller for Step-Up or Step-Down DC/DC Conversion
  • Wide VIN: 4.2 V (2.5 V With Bias) to 30 V (42 V Maximum)
  • Flexible VOUT: 0.8 V to 30 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 28-pin HTSSOP Package With PowerPAD™

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The LM34936-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 device operates over a wide input voltage range of 4.2 V to 30 V (42 V absolute maximum) to support a variety of applications.

The LM34936-Q1 uses 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 LM34936-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 LM34936-Q1 30-V Wide VIN Synchronous Four-Switch Buck-Boost Controller datasheet Dec. 14, 2018
Technical articles Four-switch buck-boost layout tip No. 4: routing gate-drive and return paths Feb. 20, 2019
Application notes LM5176 Power Sharing Between Two Parallel, Four-Switch Buck-Boost Converters Jul. 16, 2018

Design & development

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

Hardware development

document-generic User guide

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 (...)

  • 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 (...)
document-generic User guide
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.
  • 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

SNVMBL5.ZIP (130 KB) - PSpice Model
SNVC208.ZIP (3362 KB)

CAD/CAE symbols

Package Pins Download
HTSSOP (PWP) 28 View options

Ordering & quality

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