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LM5122

ACTIVE

3-65V Wide Vin, Current Mode Synchronous Boost Controller with Multiphase Capability

Product details

Topology Boost, Flyback, Forward, SEPIC Vin (min) (V) 3 Vin (max) (V) 65 Vout (min) (V) 3 Vout (max) (V) 100 Regulated outputs (#) 1 Switching frequency (min) (kHz) 50 Switching frequency (max) (kHz) 1000 Iq (typ) (mA) 4 Features Enable, Frequency synchronization, Phase Interleaving, Synchronous Rectification, UVLO adjustable Duty cycle (max) (%) 100 Rating Catalog Operating temperature range (°C) -40 to 125 Type Controller Thermal resistance θJA (°C/W) 36
Topology Boost, Flyback, Forward, SEPIC Vin (min) (V) 3 Vin (max) (V) 65 Vout (min) (V) 3 Vout (max) (V) 100 Regulated outputs (#) 1 Switching frequency (min) (kHz) 50 Switching frequency (max) (kHz) 1000 Iq (typ) (mA) 4 Features Enable, Frequency synchronization, Phase Interleaving, Synchronous Rectification, UVLO adjustable Duty cycle (max) (%) 100 Rating Catalog Operating temperature range (°C) -40 to 125 Type Controller Thermal resistance θJA (°C/W) 36
HTSSOP (PWP) 24 49.92 mm² 7.8 x 6.4 HTSSOP (PWP) 20 41.6 mm² 6.5 x 6.4
  • Maximum Input Voltage: 65 V
  • Minimum Input Voltage: 3 V (4.5 V for Start-Up)
  • Output Voltage up to 100 V
  • Bypass (VOUT = VIN) Operation
  • 1.2-V Reference with ±1% Accuracy
  • Free-Run and Synchronizable Switching to 1 MHz
  • 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
  • Multi-phase Capability
  • Thermally Enhanced 20 or 24-Pin HTSSOP
  • Create a Custom Design Using the LM5122 With the WEBENCH® Power Designer
  • Maximum Input Voltage: 65 V
  • Minimum Input Voltage: 3 V (4.5 V for Start-Up)
  • Output Voltage up to 100 V
  • Bypass (VOUT = VIN) Operation
  • 1.2-V Reference with ±1% Accuracy
  • Free-Run and Synchronizable Switching to 1 MHz
  • 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
  • Multi-phase Capability
  • Thermally Enhanced 20 or 24-Pin HTSSOP
  • Create a Custom Design Using the LM5122 With the WEBENCH® Power Designer

The LM5122 is a multi-phase 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 1 MHz. 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 180° 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 LM5122 is a multi-phase 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 1 MHz. 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 180° 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

Design & development

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Evaluation board

LM5122EVM-1PH — LM5122EVM-1PH Wide Vin Synchronous Boost Controller Evaluation Module

The LM5122EVM-1PH evaluation module (EVM) provides the design engineer with a fully functional synchronous boost converter to evaluate the Texas Instruments LM5122 synchronous boost controller IC. The EVM provides 24V output at up to 4.5A current from a 9V to 20V input. The EVM is designed to (...)
User guide: PDF
Not available on TI.com
Evaluation board

LM5122EVM-2PH — LM5122EVM-2PH Wide Vin Synchronous Boost Controller Evaluation Module

The LM5122EVM-2PH evaluation module (EVM) provides the design engineer with a fully functional dual phase synchronous boost converter to evaluate the Texas Instruments LM5122 synchronous boost controller IC. The EVM provides 28V output at up to 7A current from a 9V to 20V input. The EVM is (...)
User guide: PDF
Not available on TI.com
Evaluation board

PMLKBOOSTEVM — TI-PMLK Boost Experiment Board using TPS55340 & LM5122

The TI-PMLK Boost Experiment Board is part of the TI Power Management Lab Kit (TI-PMLK) series. TI-PMLK series provides hands on learning to reinforce power supply knowledge. The modular format allows users to customize the TI-PMLK series experience in a way that makes the most impact on (...)

User guide: PDF
Not available on TI.com
Simulation model

LM5122 Dual-Phase TINA-TI Transient Reference Design

SNVMAV2.TSC (729 KB) - TINA-TI Reference Design
Simulation model

LM5122 TINA-TI Transient Reference Design (Rev. B)

SNVM495B.TSC (188 KB) - TINA-TI Reference Design
Simulation model

LM5122 TINA-TI Transient Spice Model (Rev. B)

SNVM494B.ZIP (52 KB) - TINA-TI Spice Model
Simulation model

LM5122 Unencrypted PSpice Average Model Package (Rev. A)

SNVMBC0A.ZIP (78 KB) - PSpice Model
Simulation model

LM5122-Q1 PSpice Model (Rev. B)

SNVM416B.ZIP (56 KB) - PSpice Model
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

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 (...)

Many TI reference designs include the LM5122

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HTSSOP (PWP) 24 View options
HTSSOP (PWP) 20 View options

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