LM25122-Q1

ACTIVE

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

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LM51231-Q1 ACTIVE 2.2-MHz wide-VIN, synchronous boost controller with output voltage tracking Updated, better specs

Product details

Vin (min) (V) 3 Vin (max) (V) 42 Operating temperature range (°C) -40 to 125 Control mode current mode Topology Boost, Flyback, Forward, SEPIC Rating Automotive Vout (min) (V) 3 Vout (max) (V) 50 Features Enable, Frequency synchronization, Phase Interleaving, Synchronous Rectification Iq (typ) (µA) 4000 Duty cycle (max) (%) 100
Vin (min) (V) 3 Vin (max) (V) 42 Operating temperature range (°C) -40 to 125 Control mode current mode Topology Boost, Flyback, Forward, SEPIC Rating Automotive Vout (min) (V) 3 Vout (max) (V) 50 Features Enable, Frequency synchronization, Phase Interleaving, Synchronous Rectification Iq (typ) (µA) 4000 Duty cycle (max) (%) 100
HTSSOP (PWP) 20 41.6 mm² 6.5 x 6.4
  • 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
  • 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

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.

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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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) PDF | HTML 27 May 2016
White paper An overview of radiated EMI specifications for power supplies 05 Jun 2018
White paper An overview of conducted EMI specifications for power supplies 01 Feb 2018
Application brief Improve DC/DC Regulator EMI for Free with Optimized Power Stage Layout 13 Nov 2017
Technical article Get loud with a 700W automotive audio amplifier for infotainment systems PDF | HTML 15 Jun 2017
More literature TI Automotive External Amplifiers (Rev. A) 03 Feb 2017

Design & development

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Calculation tool

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Supported products & hardware

Supported products & hardware

Products
AC/DC & DC/DC controllers (external FET)
LM25122-Q1 3-42-V wide VIN, synchronous boost controller with multiphase capability, AEC-Q100 qualified LM5122ZA 3-V to 65-V wide VIN, current mode synchronous boost controller with multiphase capability
Reference designs

PMP11769 — 700-W Automotive External Audio Amplifier Reference Design

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). (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP31114 — Synchronous SEPIC suited for 3-V cold cranking reference design

This reference design uses LM25122 with an output voltage of 5-V and 5-A max output current. The typical input voltage range is from 6 V to 18 V. The design withstands input voltages as low as cold crank 3 V and load dump up to 36 V. Switching frequency FSW has been measured for this individual (...)
Test report: PDF
Reference designs

TIDA-01610 — Automotive Tracking Power Supply Reference Design for Audio Amplifiers

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.
Design guide: PDF
Schematic: PDF
Reference designs

TIDA-01534 — Automotive Off-battery Dual-phase Boost Converter Reference Design

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 (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDA-01553 — Automotive Off-battery VCM Supporting 2.5-V Cold Crank Profile Reference Design

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 (...)
Design guide: PDF
Schematic: PDF
Reference designs

PMP21112 — 98% Efficient 400W Adjustable Output Dual Phase Boost with Envelope Tracking Reference Design

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 (...)
Test report: PDF
Schematic: PDF
Reference designs

TIDA-00699 — Front End Power Supply Reference Design with Cold Crank Operation, Transient Protection, EMI Filter

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.
Design guide: PDF
Schematic: PDF
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HTSSOP (PWP) 20 Ultra Librarian

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