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LM27402SQ/NOPB
High Performance Synchronous Buck Controller with DCR Current Sensing
CBOOT
GND
SS/TRACK
COMP
FADJ
SYNC
VIN
VOUT+
LM27402VOUT+
VDD
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Design
LM27402SNVS615K –JANUARY 2010–REVISED FEBRUARY 2018
LM27402 High-Performance Synchronous Buck Controller With DCR Current Sensing Features Wide Input-Voltage Rangeof3Vto20V Inductor DCRor Shunt Resistor Based
Overcurrent Protection 0.6-V Reference With ±1% FB Accuracy Across
Full –40°Cto 125°C Junction Temperature Range Switching Frequency from 200 kHzto 1.2 MHz Output Voltageas Highas 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 Createa Custom Design Using the LM27402 With
the WEBENCH® Power Designer
Applications High-Current, Low-Voltage Supplyfor FPGA and
ASIC General-Purpose, High-Current Buck Converters DC/DC Converters and POL Modules Telecom, Datacom, Networking, Distributed Power
Architectures Cryptocurrency Miners (Bitcoin, Ethereum,
Litecoin)
DescriptionThe LM27402 isa 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 capabilityat the output. An
input operating voltage rangeof3Vto 20V makes
the LM27402 suitablefora large varietyof input rails.
The LM27402 voltage-mode control loop incorporates
input voltage feed forward to maintain stability
throughout the entire input-voltage range. The
switching frequencyis adjustable from 200 kHzto
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. adjustable external soft start limits inrush current
and provides monotonic output control during start-
up. Other features include external trackingof other
power supplies, integrated LDO bias supply, and
synchronization capability.
Device Information(1)(1) Forall available packages, see the orderable addendumat
the endofthe data sheet.
Typical Application Circuit
