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LM34936-Q1

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Automotive, 30-V wide VIN synchronous 4-switch buck-boost controller

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Data sheet

LM34936-Q1

ACTIVE
Data sheet Order now

Product details

Vin (min) (V) 4.2 Vin (max) (V) 30 Operating temperature range (°C) -40 to 125 Topology Buck-Boost Rating Automotive Vout (min) (V) 0.8 Vout (max) (V) 30 Features Adjustable current limit, Enable, Frequency synchronization, Power good, Pre-Bias Start-Up, Spread Spectrum, Synchronous Rectification, UVLO adjustable Iq (typ) (µA) 2000 Duty cycle (max) (%) 100
Vin (min) (V) 4.2 Vin (max) (V) 30 Operating temperature range (°C) -40 to 125 Topology Buck-Boost Rating Automotive Vout (min) (V) 0.8 Vout (max) (V) 30 Features Adjustable current limit, Enable, Frequency synchronization, Power good, Pre-Bias Start-Up, Spread Spectrum, Synchronous Rectification, UVLO adjustable Iq (typ) (µA) 2000 Duty cycle (max) (%) 100
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
  • 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™
  • Create a custom design using the LM34936-Q1 with the WEBENCH Power Designer
  • 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™
  • Create a custom design using the LM34936-Q1 with the WEBENCH Power Designer

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.

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
* Data sheet LM34936-Q1 30-V Wide VIN Synchronous Four-Switch Buck-Boost Controller datasheet (Rev. A) PDF | HTML 14 Sep 2021
Application note LM5176 Power Sharing Between Two Parallel, Four-Switch Buck-Boost Converters 16 Jul 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
Evaluation board

LM5175EVM — LM5175EVM Wide Vin Single Inductor Buck-Boost Controller Evaluation Module

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 (...)

User guide: PDF
Not available on TI.com
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

LM34936 PSpice Transient Model

SNVMBL5.ZIP (130 KB) - PSpice Model
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Calculation tool

LM34936-BUCK-BOOST-QUICKSTART-TOOL — LM34936 Buck-Boost Quickstart Tool

The LM34936 Buck-Boost Quickstart Tool support to configure the power stage and the external components for the LM34936.
Supported products & hardware

Supported products & hardware

Products
AC/DC & DC/DC controllers (external FET)
LM34936 — 30-V Wide VIN Synchronous 4-Switch Buck-Boost Controller LM34936-Q1 — Automotive, 30-V wide VIN synchronous 4-switch buck-boost controller
Hardware development
Evaluation board
LM34936EVM — LM34936 Evaluation Module
Download
Calculation tool

SNVC208 — LM5176 Design Calculator

Supported products & hardware

Supported products & hardware

Products
AC/DC & DC/DC controllers (external FET)
LM34936-Q1 — Automotive, 30-V wide VIN synchronous 4-switch buck-boost controller LM5176 — 55V wide VIN synchronous 4-switch buck-boost controller LM5176-Q1 — 55-V wide VIN synchronous 4-switch buck-boost controller, AEC-Q100 qualified
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HTSSOP (PWP) 28 Ultra Librarian
TI's Standard Terms and Conditions for Evaluation Items apply.

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