November 2012
FAN21SV04 — TinyBuck™ 4 A, 24 V Single-Input
Integrated Synchronous Buck Regulator
Features
Description
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Single-Supply Operation with 4 A Output Current
The FAN21SV04 TinyBuck™ is a highly efficient,
small-footprint,
programmable-frequency,
4 A,
Wide Input Range with Dual Supply: 3.0 V to 24 V
Wide Output Voltage Range: 0.8 V to 80% VIN
Over 94% Peak Efficiency
integrated synchronous buck regulator.
FAN21SV04 contains both synchronous MOSFETs
and a controller/driver with optimized interconnects in
one package, which enables designers to solve high-
current requirements in a small area with minimal
external components, thereby reducing cost. On-
board internal 5 V regulator enables single-supply
operation for input voltages >6.5 V.
1% Reference Accuracy Over Temperature
Fully Synchronous Operation with Integrated
Schottky Diode on Low-Side MOSFET Boosts
Efficiency
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Single Supply Device for VIN > 6.5 V – 24 V
The FAN21SV04 can be configured to drive multiple
slave devices OR synchronize to an external system
clock. In slave mode, FAN21SV04 may be set up to be
free-running in the absence of a master clock signal.
Programmable Frequency Operation (200-
600 KHz)
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Synchronizable to External Clock with
Master/Slave Provisions
External compensation, programmable switching
frequency, and current-limit features allow for design
optimization and flexibility. High-frequency operation
allows for all-ceramic solutions.
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Power-Good Signal
Accepts Ceramic Capacitors on Output
External Compensation for Flexible Design
Starts on Pre-Bias Outputs
Fairchild’s advanced BiCMOS power process,
combined with low-RDS(ON) internal MOSFETs and a
thermally efficient MLP package, provide the ability
Integrated Bootstrap Diode
to dissipate high power in
a small package.
Programmable Over-Current Protection
Integration helps minimize critical inductances,
making layout simpler and more efficient compared
to discrete solutions.
Under-Voltage, Over-Voltage, and Thermal-
Shutdown Protections
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5x6mm, 25-Pin, 3-Pad MLP Package
Output over-voltage, under-voltage, over-current, and
thermal-shutdown protections help protect the device
from damage during fault conditions. FAN21SV04
prevents pre-biased output discharge during startup in
point-of-load applications.
Applications
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Servers & Telecom
Graphics Cards & Displays
Computing Systems
Related Resources
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TinyCalc™ Calculator Design Tool
Set-Top Boxes & Game Consoles
Point-of-Load Regulation
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AN-8022 — TinyCalc™ Calculator User Guide
Ordering Information
Operating
Packing
Part Number
Temperature Range
Package
Method
FAN21SV04MPX
FAN21SV04EMPX
-10°C to 85°C
-40°C to 85°C
Molded Leadless Package (MLP) 5x6 mm
Molded Leadless Package (MLP) 5x6 mm
Tape and Reel
Tape and Reel
© 2009 Fairchild Semiconductor Corporation
FAN21SV04 • Rev. 1.0.3
www.fairchildsemi.com