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Buck-boost & inverting regulators
Buck-boost & inverting controllers (external switch)

LM34936

ACTIVE

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

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Data sheet

LM34936

ACTIVE
Data sheet Order now

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 Type Controller
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 Type Controller
VQFN (RHF) 28 2E+1 mm² 5 x 4
  • 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 lnput 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
  • 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 lnput 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

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.

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

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Type Title Date
* Data sheet LM34936 30-V Wide VIN Synchronous 4-Switch Buck-Boost Controller datasheet (Rev. A) PDF | HTML 13 Aug 2021
Technical article Adjusting VOUT in USB Type-C™ and wireless charging applications, part 2 18 Feb 2020
Technical article Adjusting VOUT in USB Type-C™ and wireless charging applications, part 1 10 Feb 2020
Technical article Four-switch buck-boost layout tip No. 4: routing gate-drive and return paths 20 Feb 2019
EVM User's guide LM34936EVM User Guide 22 Aug 2018

Design & development

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

Evaluation board

LM34936EVM — LM34936 Evaluation Module

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.
User guide: PDF
Not available on TI.com
Simulation model

LM34936 PSpice Transient Model

SNVMBL5.ZIP (130 KB) - PSpice Model
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CAD/CAE symbol

LM34936EVM Altium CAD Files

SNVR492.ZIP (752 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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VQFN (RHF) 28 View options

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