3-42-V wide VIN, synchronous boost controller with multiphase capability, AEC-Q100 qualified


Product details


Vin (Min) (V) 3 Vin (Max) (V) 42 Vout (Min) (V) 3 Vout (Max) (V) 50 Regulated outputs (#) 1 Switching frequency (Min) (kHz) 50 Switching frequency (Max) (kHz) 600 Iq (Typ) (mA) 4 Features Enable, Frequency Synchronization, Phase Interleaving, Synchronous Rectification Duty cycle (Max) (%) 100 Rating Automotive Operating temperature range (C) -40 to 125 open-in-new Find other Boost controllers (external switch)

Package | Pins | Size

HTSSOP (PWP) 20 42 mm² 6.5 x 6.4 open-in-new Find other Boost controllers (external switch)


  • AEC-Q100 Qualified with the following results:
    • Device Temperature Grade 1: -40°C to +125°C Ambient Operating Temperature Range
    • Device HBM ESD Classification Level 2
    • Device CDM ESD Classification Level C6
  • Maximum Input Voltage : 42 V
  • Min Input Voltage : 3 V (4.5 V for startup)
  • Output Voltage up to 50 V
  • Bypass (VOUT = VIN) Operation
  • 1.2 V Reference with ±1.0% Accuracy
  • Free-Run and Synchronizable Switching to 600 kHz
  • Peak Current Mode Control
  • Robust 3 A Integrated Gate Drivers
  • Adaptive Dead-Time Control
  • Optional Diode Emulation Mode
  • Programmable Cycle-by-Cycle Current Limit
  • Hiccup Mode Overload Protection
  • Programmable Line UVLO
  • Programmable Soft-Start
  • Thermal Shutdown Protection
  • Low Shutdown Quiescent Current: 9 µA
  • Programmable Slope Compensation
  • Programmable Skip Cycle Mode Reduces Standby Power
  • Allows External VCC Supply
  • Inductor DCR Current Sensing Capability
  • Multiphase Capability
  • Thermally Enhanced 20-Pin HTSSOP
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The LM25122 is a multiphase capable synchronous boost controller intended for high-efficiency synchronous boost regulator applications. The control method is based upon peak current mode control. Current mode control provides inherent line feed-forward, cycle-by-cycle current limiting and ease of loop compensation.

The switching frequency is programmable up to 600 kHz. Higher efficiency is achieved by two robust N-channel MOSFET gate drivers with adaptive dead-time control. A user-selectable diode emulation mode also enables discontinuous mode operation for improved efficiency at light load conditions.

An internal charge pump allows 100% duty cycle for high-side synchronous switch (Bypass operation). A 180º phase shifted clock output enables easy multi-phase interleaved configuration. Additional features include thermal shutdown, frequency synchronization, hiccup mode current limit and adjustable line undervoltage lockout.

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NEW LM5123-Q1 PREVIEW 2.2MHz wide VIN low IQ synchronous boost controller LM5123-Q1 has updated/better specs

Technical documentation

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Type Title Date
* Data sheet LM25122-Q1 Wide-Input Synchronous Boost Controller With Multiple Phase Capability datasheet (Rev. B) May 27, 2016
Technical article How to add overvoltage protection to a synchronous boost controller Sep. 17, 2018
White paper An overview of radiated EMI specifications for power supplies Jun. 05, 2018
White paper An overview of conducted EMI specifications for power supplies Feb. 01, 2018
Application note Improve DC/DC Regulator EMI for Free with Optimized Power Stage Layout Nov. 13, 2017
Technical article Get loud with a 700W automotive audio amplifier for infotainment systems Jun. 15, 2017
More literature TI Automotive External Amplifiers (Rev. A) Feb. 03, 2017

Design & development

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Design tools & simulation

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 (...)
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SNVC196.ZIP (32 KB)

Reference designs

Automotive Tracking Power Supply Reference Design for Audio Amplifiers
TIDA-01610 — This reference design implements a 10 amp, two-phase boost converter with an adjustable output voltage that can be dynamically set for voltages from 16V to 40V DC. The output voltage range allows tracking an audio signal when provided by either a PWM signal from a processor or a voltage.
document-generic Schematic
Automotive Off-battery Dual-phase Boost Converter Reference Design
TIDA-01534 — This reference design is a high power, wide input voltage range circuit that uses synchronous boost controllers in a dual-phase configuration outputting four (4) switchable 12-V rails that each can supply up to 2.5 A with diagnostic features; plus a dual synchronous buck that generates two high (...)
document-generic Schematic
Automotive Off-battery VCM Supporting 2.5-V Cold Crank Profile Reference Design
TIDA-01553 — This reference design is a high-current, wide input voltage range circuit that can handle engine cold crank profile down to 2.5V. The dual-output voltages are 5V and 3.3V that support up to 10A for each output. The design is suitable for an automotive off-battery infotainment application that needs (...)
document-generic Schematic
700-W Automotive External Audio Amplifier Reference Design
PMP11769 — This reference design contains a boost converter that provides 36.0-V @ 10.0-A continuous / 20.0-A peak from an input voltage of 9 to 16 V. It contains two premium Class-D audio amplifiers which provide 2x 175-W @ 4-Ω load (left and right channel) and 1x 350-W @ 2-Ω (subwoofer). The (...)
document-generic Schematic
98% Efficient 400W Adjustable Output Dual Phase Boost with Envelope Tracking Reference Design
PMP21112 — PMP21112 is a dual-phase boost reference design utilizing the LM25112-Q1 controller for automotive applications. This design can operate from 9V to 16V. The design has an adjustable output of 16V to 40V and capable of sourcing 10A continuous current. LM25112-Q1 has a bypass function where Vin is (...)
document-generic Schematic
Automotive Pre-Regulator (SEPIC 5Vout @ 3A) Reference Design
PMP30331 — The PMP30331 reference design is for an input voltage from 5V to 16V.  Cranking is possible for voltages as low as 4V and load dump for voltages to 36V.  This reference design uses the SEPIC topology as a cost effective alternative for 4 switch buck-boost (for low power).
document-generic Schematic
Front End Power Supply Reference Design with Cold Crank Operation, Transient Protection, EMI Filter
TIDA-00699 This solution was designed to be a broadly applicable automotive off-battery front end power supply for 10-15W systems. There is a focus on EMI/EMC testing and compliance as well to help designers satisfy the regulatory requirements associated with producing an automotive electronic subsystem.
document-generic Schematic

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