LM27402

ACTIVE

3-V to 20-V, voltage mode synchronous buck controller with DCR current sensing

Product details

Vin (min) (V) 3 Vin (max) (V) 20 Iout (max) (A) 30 Operating temperature range (°C) -40 to 125 Control mode Voltage mode Rating Catalog Vout (min) (V) 0.6 Vout (max) (V) 18.6 Features Enable, Frequency synchronization, Power good, Pre-Bias Start-Up, Synchronous Rectification, Tracking Iq (typ) (µA) 4500 Duty cycle (max) (%) 95 Number of phases 1
Vin (min) (V) 3 Vin (max) (V) 20 Iout (max) (A) 30 Operating temperature range (°C) -40 to 125 Control mode Voltage mode Rating Catalog Vout (min) (V) 0.6 Vout (max) (V) 18.6 Features Enable, Frequency synchronization, Power good, Pre-Bias Start-Up, Synchronous Rectification, Tracking Iq (typ) (µA) 4500 Duty cycle (max) (%) 95 Number of phases 1
HTSSOP (PWP) 16 32 mm² 5 x 6.4 WQFN (RUM) 16 16 mm² 4 x 4
  • Wide Input-Voltage Range of 3 V to 20 V
  • Inductor DCR or Shunt Resistor Based Overcurrent Protection
  • 0.6-V Reference With ±1% FB Accuracy Across Full –40°C to 125°C Junction Temperature Range
  • Switching Frequency from 200 kHz to 1.2 MHz
  • Output Voltage as High as 95% of Input Voltage
  • Integrated High-Current MOSFET Drivers
  • Internal VDD Bias Supply LDO Subregulator
  • External Clock Synchronization
  • Adjustable Soft Start With External Capacitor
  • Prebiased Start-up Capability
  • Power Supply Tracking
  • Voltage-Mode Control With Line Feedforward
  • Open-Drain Power-Good Indicator
  • Precision Enable With Hysteresis
  • 16-Pin HTSSOP and WQFN Packages
  • Create a Custom Design Using the LM27402 With the WEBENCH® Power Designer
  • Wide Input-Voltage Range of 3 V to 20 V
  • Inductor DCR or Shunt Resistor Based Overcurrent Protection
  • 0.6-V Reference With ±1% FB Accuracy Across Full –40°C to 125°C Junction Temperature Range
  • Switching Frequency from 200 kHz to 1.2 MHz
  • Output Voltage as High as 95% of Input Voltage
  • Integrated High-Current MOSFET Drivers
  • Internal VDD Bias Supply LDO Subregulator
  • External Clock Synchronization
  • Adjustable Soft Start With External Capacitor
  • Prebiased Start-up Capability
  • Power Supply Tracking
  • Voltage-Mode Control With Line Feedforward
  • Open-Drain Power-Good Indicator
  • Precision Enable With Hysteresis
  • 16-Pin HTSSOP and WQFN Packages
  • Create a Custom Design Using the LM27402 With the WEBENCH® Power Designer

The LM27402 is a voltage-mode, synchronous, DC/DC step-down controller with lossless inductor DCR current sensing capability. Sensing the inductor current eliminates the need to add resistive powertrain elements, which increases overall efficiency and facilitates accurate, continuous current sensing. A 0.6-V ±1% voltage reference enables high accuracy and low voltage capability at the output. An input operating voltage range of 3 V to 20 V makes the LM27402 suitable for a large variety of input rails.

The LM27402 voltage-mode control loop incorporates input voltage feed forward to maintain stability throughout the entire input-voltage range. The switching frequency is adjustable from 200 kHz to
1.2 MHz. Dual, high-current, integrated MOSFET drivers support large QG, low RDS(on) power MOSFETs. A power-good indicator provides power-rail-sequencing capability and output fault detection. An adjustable external soft start limits inrush current and provides monotonic output control during start-up. Other features include external tracking of other power supplies, integrated LDO bias supply, and synchronization capability.

The LM27402 is a voltage-mode, synchronous, DC/DC step-down controller with lossless inductor DCR current sensing capability. Sensing the inductor current eliminates the need to add resistive powertrain elements, which increases overall efficiency and facilitates accurate, continuous current sensing. A 0.6-V ±1% voltage reference enables high accuracy and low voltage capability at the output. An input operating voltage range of 3 V to 20 V makes the LM27402 suitable for a large variety of input rails.

The LM27402 voltage-mode control loop incorporates input voltage feed forward to maintain stability throughout the entire input-voltage range. The switching frequency is adjustable from 200 kHz to
1.2 MHz. Dual, high-current, integrated MOSFET drivers support large QG, low RDS(on) power MOSFETs. A power-good indicator provides power-rail-sequencing capability and output fault detection. An adjustable external soft start limits inrush current and provides monotonic output control during start-up. Other features include external tracking of other power supplies, integrated LDO bias supply, and synchronization capability.

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Design & development

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Evaluation board

LM27402SQEVAL — LM27402 Evaluation Board

The LM27402 evaluation board represents a 20A typical application circuit. The application circuit is optimized for an input voltage of 12V. However, input voltage feed-forward technology allows the evaluation board to operate up to 20V while maintaining a stable output voltage of 1.5V at 20A. (...)

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Simulation model

LM27402 PSpice Average Model

SNVM430.ZIP (55 KB) - PSpice Model
Simulation model

LM27402 PSpice Transient Model

SNVM429.ZIP (228 KB) - PSpice Model
Simulation model

LM27402 TINA-TI Transient Reference Design (Load Tran)

SNVM468.TSC (2802 KB) - TINA-TI Reference Design
Simulation model

LM27402 TINA-TI Transient Reference Design (Startup)

SNVM470.TSC (1870 KB) - TINA-TI Reference Design
Simulation model

LM27402 TINA-TI Transient Spice Model

SNVM469.ZIP (22 KB) - TINA-TI Spice Model
Simulation model

LM27402 Unencrypted PSpice Average Model

SNVM843.ZIP (1 KB) - PSpice Model
Simulation model

LM27402 Unencrypted PSpice Transient Model

SNVM844.ZIP (3 KB) - PSpice Model
Calculation tool

LM27402DESIGN-CALC — LM27402 Design Calculator

Package Pins CAD symbols, footprints & 3D models
HTSSOP (PWP) 16 Ultra Librarian
WQFN (RUM) 16 Ultra Librarian

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