30-V Wide VIN Synchronous 4-Switch Buck-Boost Controller


Product details


Topology Buck-Boost Vin (Min) (V) 4.2 Vin (Max) (V) 30 Vout (Max) (V) 30 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, Power Good, Pre-Bias Start-Up, Synchronous Rectification, UVLO Adjustable Operating temperature range (C) -40 to 125 Rating Catalog open-in-new Find other Buck-boost & inverting controllers (external switch)

Package | Pins | Size

VQFN (RHF) 28 20 mm² 5 x 4 open-in-new Find other Buck-boost & inverting controllers (external switch)


  • Single Inductor Buck-Boost Controller for Step-Up/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 QFN-28 Package
  • Create a Custom Design Using the LM34936 with the WEBENCH Power Designer

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The LM34936 is a synchronous four-switch buck-boost DC/DC controller capable of regulating the output voltage at, above, or below the input voltage. The LM34936 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 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 LM34936 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

= Top documentation for this product selected by TI
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Type Title Date
* Datasheet LM34936 30-V Wide VIN Synchronous 4-Switch Buck-Boost Controller datasheet Feb. 01, 2018
Technical articles Adjusting VOUT in USB Type-C™ and wireless charging applications, part 2 Feb. 18, 2020
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
User guides LM34936EVM User Guide Aug. 22, 2018

Design & development

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Hardware development

document-generic User guide
The LM34936EVM features a four switch buck-boost converter based on TI’s LM34936 Wide VIN buck-boost controller. This converter is designed to operate from input voltage from 6V to 30V and provide a 12V regulated output with a load current of up to 6 A.
  • Ultra high (>98%) peak power conversion efficiency
  • Smooth buck-boost operation
  • Optional hiccup mode overload protection
  • Optional frequency dithering for reduced EMI

Design tools & simulation

SNVMBL5.ZIP (130 KB) - PSpice Model
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 (...)
  • 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
  • (...)
SNVR492.ZIP (752 KB)

CAD/CAE symbols

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VQFN (RHF) 28 View options

Ordering & quality

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