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LM25122-Q1

ACTIVE

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

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Data sheet

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

LM25122-Q1

ACTIVE
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Product details

Rating Automotive Topology Boost, Flyback, Forward, SEPIC Vin (max) (V) 42 Vin (min) (V) 3 Vout (max) (V) 50 Vout (min) (V) 3 Control mode current mode Features Enable, Frequency synchronization, Phase interleaving, Synchronous rectification Duty cycle (max) (%) 100 Iq (typ) (A) 0.004 Operating temperature range (°C) -40 to 125
Rating Automotive Topology Boost, Flyback, Forward, SEPIC Vin (max) (V) 42 Vin (min) (V) 3 Vout (max) (V) 50 Vout (min) (V) 3 Control mode current mode Features Enable, Frequency synchronization, Phase interleaving, Synchronous rectification Duty cycle (max) (%) 100 Iq (typ) (A) 0.004 Operating temperature range (°C) -40 to 125
HTSSOP (PWP) 20 41.6 mm² (6.5 mm × 6.4 mm)
  • 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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Top documentation Type Title Format options Date
* Data sheet LM25122-Q1 Wide-Input Synchronous Boost Controller With Multiple Phase Capability datasheet (Rev. B) PDF | HTML May 27, 2016
White paper An overview of radiated EMI specifications for power supplies Jun 5, 2018
White paper An overview of conducted EMI specifications for power supplies Feb 1, 2018
Application brief 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 PDF | HTML Jun 15, 2017
More literature TI Automotive External Amplifiers (Rev. A) Feb 3, 2017

Design & development

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Calculation tool

SNVC196 — LM25122-Q1 Design Calculator

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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 (...)
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HTSSOP (PWP) 20 Ultra Librarian
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