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Fairchild Semiconductor |
September 2008
FAN2108www.datasheet4u.com — TinyBuck™
3-24V Input, 8A, High-Efficiency, Integrated Synchronous
Buck Regulator
Features
Wide Input Voltage Range: 3V-24V
Wide Output Voltage Range: 0.8V to 80% VIN
8A Output Current
Programmable Frequency Operation: 200KHz to
600KHz
Over 95% Peak Efficiency
Integrated Schottky Diode on Low-side MOSFET
Boosts Efficiency
Internal Bootstrap diode
Power-Good Signal
Pre-Bias Startup
Accepts Ceramic Capacitors on Output
External Compensation for Flexible Design
Input Under-Voltage Lockout
Programmable Current Limit
Under-Voltage, Over-Voltage, and Thermal
Shutdown Protections
Internal Soft-Start
5x6mm, 25-Pin, 3-Pad MLP Package
Applications
Servers
Point-of-Load Regulation
High-End Computing Systems
Graphics Cards
Battery-Powered Equipment
Set-Top Boxes
Description
The FAN2108 TinyBuck™ is a highly efficient, small
footprint, 8A, synchronous buck regulator.
The FAN2108 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.
External compensation, programmable switching
frequency, and current limit features allow design
optimization and flexibility.
The summing current mode modulator uses lossless
current sensing for current feedback and over-current
protection. Voltage feedforward helps operation over a
wide input voltage range.
Fairchild’s advanced BiCMOS power process,
combined with low-RDS(ON) internal MOSFETs and a
thermally efficient MLP package, provide the ability to
dissipate high power in a small package.
Output over-voltage, under-voltage, and thermal
shutdown protections help protect the device from
damage during fault conditions. FAN2108 prevents pre-
biased output discharge during startup in point-of-load
applications.
Ordering Information
Part Number
FAN2108MPX
FAN2108EMPX
Operating
Temperature Range
-10°C to 85°C
-40°C to 85°C
Package
Molded Leadless Package (MLP) 5x6mm
Molded Leadless Package (MLP) 5x6mm
Eco
Status
Green
Green
Packing
Method
Tape and Reel
Tape and Reel
For Fairchild’s definition of “green” Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
© 2008 Fairchild Semiconductor Corporation
FAN2108 • Rev. 1.0.0
www.fairchildsemi.com
Typical Application
www.datasheet4u.com
Block Diagram
Figure 1. Typical Application Diagram
© 2008 Fairchild Semiconductor Corporation
FAN2108 • Rev. 1.0.0
Figure 2. Block Diagram
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www.fairchildsemi.com
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