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LMG5126

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42V VIN, 2.5MHz synchronous GaN boost converter with output voltage tracking

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Data sheet

LMG5126

ACTIVE
Data sheet Order now

Product details

Rating Catalog Topology Boost Vin (max) (V) 42 Vin (min) (V) 2.5 Vout (max) (V) 60 Vout (min) (V) 6 Features Adjustable current limit, Adjustable soft start, Adjustable switching frequency, Analog current monitor, Automatic Light Load Management, Bypass Mode, Chip-enable control pin, Cycle-by-cycle overcurrent protection, External Sync, Fixed PWM Mode, Overcurrent protection with adjustable delay, Power good, Programmable dead time, Spread Spectrum, Tracking EMI features Frequency Dithering, Spread Spectrum Control mode current mode control Switching frequency (min) (kHz) 0.3 Switching frequency (max) (kHz) 2.5 Operating temperature range (°C) -40 to 125 Iq (typ) (µA) 1100 Duty cycle (max) (%) 97 Type Converter (Integrated Switch)
Rating Catalog Topology Boost Vin (max) (V) 42 Vin (min) (V) 2.5 Vout (max) (V) 60 Vout (min) (V) 6 Features Adjustable current limit, Adjustable soft start, Adjustable switching frequency, Analog current monitor, Automatic Light Load Management, Bypass Mode, Chip-enable control pin, Cycle-by-cycle overcurrent protection, External Sync, Fixed PWM Mode, Overcurrent protection with adjustable delay, Power good, Programmable dead time, Spread Spectrum, Tracking EMI features Frequency Dithering, Spread Spectrum Control mode current mode control Switching frequency (min) (kHz) 0.3 Switching frequency (max) (kHz) 2.5 Operating temperature range (°C) -40 to 125 Iq (typ) (µA) 1100 Duty cycle (max) (%) 97 Type Converter (Integrated Switch)
VQFN-FCRLF (VBT) 22 24.75 mm² 5.5 x 4.5
  • Input voltage 6.5V to 42V
    • Minimum 2.5V for V(BIAS) ≥ 6.5V or VOUT ≥ 6V
  • Output Voltage 6V to 60V
    • 2% accuracy, internal feedback resistors
    • Bypass operation for VI > VOUT
      • Boot refresh out of audio >20kHz
    • Dynamic output voltage tracking
      • Digital PWM tracking (DTRK)
      • Analog tracking (ATRK)
    • Over voltage protection (65V, 50V, 35V, 25V)
  • Low shutdown ISD of 5µA typical (100uA maximum)
  • Low operating IQ of 1.5mA typical (2.5mA maximum)
  • Stacking with interleaved multiphase operation
    • Up to 4-devices without external clock
  • Switching frequency from 300kHz to 2.5MHz
    • Synchronization to external clock (SYNCIN)
    • Spread Spectrum (DRSS)
  • Dynamically selectable switching modes (FPWM, Diode emulation)
  • Current sense resistor or DCR sensing
  • Average inductor current monitor
  • Average input current limit
  • Selectable current limit (29mV or 60mV)
  • Selectable delay time (DLY)
  • Power good indicator
  • Programmable VI undervoltage lockout (UVLO)
  • Lead-less RLF-22 package with wettable flanks
  • Create a custom design using the LMG5126 with the WEBENCH Power Designer
  • Input voltage 6.5V to 42V
    • Minimum 2.5V for V(BIAS) ≥ 6.5V or VOUT ≥ 6V
  • Output Voltage 6V to 60V
    • 2% accuracy, internal feedback resistors
    • Bypass operation for VI > VOUT
      • Boot refresh out of audio >20kHz
    • Dynamic output voltage tracking
      • Digital PWM tracking (DTRK)
      • Analog tracking (ATRK)
    • Over voltage protection (65V, 50V, 35V, 25V)
  • Low shutdown ISD of 5µA typical (100uA maximum)
  • Low operating IQ of 1.5mA typical (2.5mA maximum)
  • Stacking with interleaved multiphase operation
    • Up to 4-devices without external clock
  • Switching frequency from 300kHz to 2.5MHz
    • Synchronization to external clock (SYNCIN)
    • Spread Spectrum (DRSS)
  • Dynamically selectable switching modes (FPWM, Diode emulation)
  • Current sense resistor or DCR sensing
  • Average inductor current monitor
  • Average input current limit
  • Selectable current limit (29mV or 60mV)
  • Selectable delay time (DLY)
  • Power good indicator
  • Programmable VI undervoltage lockout (UVLO)
  • Lead-less RLF-22 package with wettable flanks
  • Create a custom design using the LMG5126 with the WEBENCH Power Designer

The LMG5126 is a stackable multiphase synchronous boost converter. The device provides a regulated output voltage for lower or equal input voltage also supporting VI to VOUT bypass mode to save power. Up to 4 devices can be stacked with or without external clock.

VOUT can be dynamically programmed using the digital or analog ATRK/DTRK function. VI can be as low as 2.5V after startup as the internal VCC supply is automatically switched from VBIAS to VOUT for VBIAS < 6.5V. The fixed switching frequency is set between 300kHz and 2.5MHz via a resistor on the RT-pin or the SYNCIN clock. The switching modes FPWM or Diode emulation can be changed during operation.

The implemented protections peak current limit, average input current limit, 120% input current limit, average inductor current monitor, over- and undervoltage protection or the thermal shutdown protect the device and the application.

The LMG5126 is a stackable multiphase synchronous boost converter. The device provides a regulated output voltage for lower or equal input voltage also supporting VI to VOUT bypass mode to save power. Up to 4 devices can be stacked with or without external clock.

VOUT can be dynamically programmed using the digital or analog ATRK/DTRK function. VI can be as low as 2.5V after startup as the internal VCC supply is automatically switched from VBIAS to VOUT for VBIAS < 6.5V. The fixed switching frequency is set between 300kHz and 2.5MHz via a resistor on the RT-pin or the SYNCIN clock. The switching modes FPWM or Diode emulation can be changed during operation.

The implemented protections peak current limit, average input current limit, 120% input current limit, average inductor current monitor, over- and undervoltage protection or the thermal shutdown protect the device and the application.
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* Data sheet LMG5126 Wide-Input, 2.5MHz, Boost Converter datasheet (Rev. A) PDF | HTML 09 Dec 2025
Certificate LMG5126EVM EU Declaration of Conformity (DoC). 08 Sep 2025

Design & development

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

Evaluation board

LMG5126EVM — LMG5126 evaluation module

The LMG5126 evaluation module (EVM) showcases the features and performance of the LMG5126 wide input voltage synchronous GaN boost converter. This EVM is designed for ease of configuration, enabling the user to evaluate many different applications on the same module. The standard configuration is (...)

User guide: PDF | HTML
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Calculation tool

LMG5126-CALC — LMG5126 quick start calculator

LMG5126 quick start calculator helps on design of the power stage, component selection and loop compensation.
Supported products & hardware

Supported products & hardware

Products
AC/DC & DC/DC converters (integrated FET)
LMG5126 — 42V VIN, 2.5MHz synchronous GaN boost converter with output voltage tracking
Hardware development
Evaluation board
LMG5126EVM — LMG5126 evaluation module
Download
Reference designs

PMP31404 — 3V to 42V synchronous GaN boost converter reference design

The reference design is designed for high boost factor and high efficiency. The design operates over a wide input voltage range, starting from 3V using the LMG5126 boost converter with integrated Gallium Nitride (GaN) field-effect transistors (FETs). The reference design includes features such as (...)
Test report: PDF
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VQFN-FCRLF (VBT) 22 Ultra Librarian
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