LM2854

ACTIVE

4A 500 kHz / 1 MHz Synchronous Buck Regulator

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Product details

Rating Catalog Operating temperature range (°C) -40 to 85 Topology Buck Type Converter Iout (max) (A) 4 Vin (min) (V) 2.95 Vin (max) (V) 5.5 Switching frequency (min) (kHz) 500 Switching frequency (max) (kHz) 1000 Features Enable, Synchronous Rectification, Tracking Control mode Voltage mode Vout (min) (V) 0.8 Vout (max) (V) 5 Iq (typ) (µA) 1700 Duty cycle (max) (%) 100
Rating Catalog Operating temperature range (°C) -40 to 85 Topology Buck Type Converter Iout (max) (A) 4 Vin (min) (V) 2.95 Vin (max) (V) 5.5 Switching frequency (min) (kHz) 500 Switching frequency (max) (kHz) 1000 Features Enable, Synchronous Rectification, Tracking Control mode Voltage mode Vout (min) (V) 0.8 Vout (max) (V) 5 Iq (typ) (µA) 1700 Duty cycle (max) (%) 100
HTSSOP (PWP) 16 32 mm² 5 x 6.4
  • Input Voltage Range of 2.95 V to 5.5 V
  • Maximum Load Current of 4 A
  • Wide Bandwidth Voltage Mode Control Loop, Partial Internal Compensation
  • Fixed Switching Frequency of 500 kHz or 1 MHz
  • 35-mΩ Integrated MOSFET Switches
  • Adjustable Output Voltage Down to 0.8 V
  • Optimized Reference Voltage Initial Accuracy and Temperature Drift
  • External Soft-Start Control With Tracking Capability
  • Enable Pin With Hysteresis
  • Low Standby Current of 230 µA
  • Pre-Biased Load Start-up Capability
  • Integrated UVLO, OCP, and Thermal Shutdown
  • 100% Duty Cycle Capability
  • HTSSOP-16 Exposed Pad Package
  • Input Voltage Range of 2.95 V to 5.5 V
  • Maximum Load Current of 4 A
  • Wide Bandwidth Voltage Mode Control Loop, Partial Internal Compensation
  • Fixed Switching Frequency of 500 kHz or 1 MHz
  • 35-mΩ Integrated MOSFET Switches
  • Adjustable Output Voltage Down to 0.8 V
  • Optimized Reference Voltage Initial Accuracy and Temperature Drift
  • External Soft-Start Control With Tracking Capability
  • Enable Pin With Hysteresis
  • Low Standby Current of 230 µA
  • Pre-Biased Load Start-up Capability
  • Integrated UVLO, OCP, and Thermal Shutdown
  • 100% Duty Cycle Capability
  • HTSSOP-16 Exposed Pad Package

The LM2854 PowerWise™ buck regulator is a 500-kHz or 1-MHz step-down switching voltage regulator capable of driving up to a 4-A load with exceptional power conversion efficiency, line and load regulation, and output accuracy. The LM2854 can accept an input voltage rail between 2.95 V and 5.5 V, and deliver an adjustable and highly accurate output voltage as low as 0.8 V. Externally established soft-start with a small capacitor facilitates controlled start-up, and the LM2854 is capable of starting gracefully into a pre-biased output voltage. Partial internal compensation reduces the number of external passive components and PC board space typically necessary in a voltage mode buck converter application, yet preserving flexibility to deal with ceramic and/or electrolytic based load capacitors. Lossless cycle-by-cycle peak current limit is used to protect the load from an overcurrent or short-circuit fault, and an enable comparator simplifies sequencing applications. The LM2854 is available in an exposed pad HTSSOP-16 package that enhances the thermal performance of the regulator.

The LM2854 PowerWise™ buck regulator is a 500-kHz or 1-MHz step-down switching voltage regulator capable of driving up to a 4-A load with exceptional power conversion efficiency, line and load regulation, and output accuracy. The LM2854 can accept an input voltage rail between 2.95 V and 5.5 V, and deliver an adjustable and highly accurate output voltage as low as 0.8 V. Externally established soft-start with a small capacitor facilitates controlled start-up, and the LM2854 is capable of starting gracefully into a pre-biased output voltage. Partial internal compensation reduces the number of external passive components and PC board space typically necessary in a voltage mode buck converter application, yet preserving flexibility to deal with ceramic and/or electrolytic based load capacitors. Lossless cycle-by-cycle peak current limit is used to protect the load from an overcurrent or short-circuit fault, and an enable comparator simplifies sequencing applications. The LM2854 is available in an exposed pad HTSSOP-16 package that enhances the thermal performance of the regulator.

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Technical documentation

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Type Title Date
* Data sheet LM2854 4-A 500-kHz / 1-MHz Synchronous Buck Regulator datasheet (Rev. E) PDF | HTML 04 Oct 2017
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
EVM User's guide AN-1786 LM2854 500 kHz Buck Regulator Evaluation Board (Rev. B) 01 May 2013
EVM User's guide AN-1880 LM2854 1MHz Buck Regulator Demo Board (Rev. B) 01 May 2013
Application note AN-1197 Selecting Inductors for Buck Converters (Rev. B) 23 Apr 2013

Design & development

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LM2854X PSpice Average Model

SNVM268.ZIP (51 KB) - PSpice Model
Simulation model

LM2854X PSpice Transient Model

SNVM266.ZIP (155 KB) - PSpice Model
Simulation model

LM2854X Unencrypted PSpice Average Model

SNVM915.ZIP (1 KB) - PSpice Model
Simulation model

LM2854X Unencrypted PSpice Transient Model

SNVM917.ZIP (2 KB) - PSpice Model
Simulation model

LM2854Y PSpice Average Model

SNVM265.ZIP (53 KB) - PSpice Model
Simulation model

LM2854Y PSpice Transient Model

SNVM267.ZIP (164 KB) - PSpice Model
Simulation model

LM2854Y Unencrypted PSpice Average Model

SNVM918.ZIP (1 KB) - PSpice Model
Simulation model

LM2854Y Unencrypted PSpice Transient Model

SNVM916.ZIP (2 KB) - PSpice Model
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HTSSOP (PWP) 16 Ultra Librarian

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