LM27402

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

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Data sheet

document-pdfAcrobat LM27402 High-Performance Synchronous Buck Controller With DCR Current Sensing datasheet (Rev. K) PDF | HTML

LM27402

ACTIVE

Data sheet

Order now

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

Topology

Buck

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

Topology

Buck

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 Q_G, low R_DS(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 Q_G, low R_DS(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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Technical documentation

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	Type	Title		Date
*	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
	User guide	LM27402 Buck Controller Evaluation Module User's Guide (Rev. C)	PDF \| HTML	10 Jan 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 Apr 2013

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. (...)

User guide: PDF | HTML