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LM27402

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Controlador reductor síncrono de modo de tensión de 3 V a 20 V con detección de corriente DCR

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LM27402

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Detalles del producto

Rating Catalog Topology Buck Iout (max) (A) 30 Vin (max) (V) 20 Vin (min) (V) 3 Vout (max) (V) 18.6 Vout (min) (V) 0.6 Control mode Voltage mode Features Enable, Frequency synchronization, Power good, Pre-Bias Start-Up, Synchronous Rectification, Tracking Duty cycle (max) (%) 95 Iq (typ) (A) 0.0045 Number of phases 1 Operating temperature range (°C) -40 to 125
Rating Catalog Topology Buck Iout (max) (A) 30 Vin (max) (V) 20 Vin (min) (V) 3 Vout (max) (V) 18.6 Vout (min) (V) 0.6 Control mode Voltage mode Features Enable, Frequency synchronization, Power good, Pre-Bias Start-Up, Synchronous Rectification, Tracking Duty cycle (max) (%) 95 Iq (typ) (A) 0.0045 Number of phases 1 Operating temperature range (°C) -40 to 125
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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Documentación técnica

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Documentación principal Tipo Título Opciones de formato Fecha
* Data sheet LM27402 High-Performance Synchronous Buck Controller With DCR Current Sensing datasheet (Rev. K) PDF | HTML 23 feb 2018
Certificate LM27402SQEVAL EU RoHS Declaration of Conformity (DoC) (Rev. A) 08 mar 2022
Selection guide Power Management Guide 2018 (Rev. R) 25 jun 2018
Analog Design Journal Common mistakes made in controller designs for power converters 26 mar 2018
Application brief Using DC/DC Controllers to Improve Bitcoin Miner Designs 15 mar 2018
Analog Design Journal Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics 21 jul 2016
Technical article High Density PCB Layout of DC/DC Converters, Part 2 PDF | HTML 16 sep 2015
Technical article High Density PCB Layout of DC/DC Converters, Part 1 PDF | HTML 12 sep 2015
Application note AN-2060 LM27402 Current Limit Application Circuits (Rev. A) 06 may 2013
Application note Current Limit Foldback Improves Short Circuit Protection in LM274X Family (Rev. B) 23 abr 2013

Diseño y desarrollo

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Placa de evaluación

LM27402SQEVAL — Placa de evaluación LM27402

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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Modelo de simulación

LM27402 PSpice Average Model

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LM27402 PSpice Transient Model

SNVM429.ZIP (228 KB) - PSpice Model
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Modelo de simulación

LM27402 TINA-TI Transient Reference Design (Load Tran)

SNVM468.TSC (2802 KB) - TINA-TI Reference Design
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Modelo de simulación

LM27402 TINA-TI Transient Reference Design (Startup)

SNVM470.TSC (1870 KB) - TINA-TI Reference Design
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Modelo de simulación

LM27402 TINA-TI Transient Spice Model

SNVM469.ZIP (22 KB) - TINA-TI Spice Model
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Modelo de simulación

LM27402 Unencrypted PSpice Average Model

SNVM843.ZIP (1 KB) - PSpice Model
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Modelo de simulación

LM27402 Unencrypted PSpice Transient Model

SNVM844.ZIP (3 KB) - PSpice Model
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Herramienta de cálculo

LM27402DESIGN-CALC — Calculadora de diseño LM27402

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Encapsulado Pines Símbolos CAD, huellas y modelos 3D
HTSSOP (PWP) 16 Ultra Librarian
WQFN (RUM) 16 Ultra Librarian
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Pedidos y calidad

Información incluida:
  • RoHS
  • REACH
  • Marcado del dispositivo
  • Acabado de plomo/material de la bola
  • Clasificación de nivel de sensibilidad a la humedad (MSL)/reflujo máximo
  • Estimaciones de tiempo medio entre fallas (MTBF)/fallas en el tiempo (FIT)
  • Contenido del material
  • Resumen de calificaciones
  • Monitoreo continuo de confiabilidad
Información incluida:
  • Lugar de fabricación
  • Lugar de ensamblaje

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