FAN23SV04T − TinyBuck™ 4 A Integrated Synchronous Buck Regulator for DDR Termination


The FAN23SV04T is a highly efficient, integrated TinyBuck™ synchronous buck regulator for use in tracking applications, such as DDR termination rails. The VDDQ input includes an internal 2:1 resistive voltage divider to reduce total circuit size and component count. The regulator operates with an input range from 7 V to 15 V and supports up to 4 A load currents. The device can operate from a 5 V rail (±10%) if VIN, PVIN, and PVCC are connected together to bypass the internal linear regulator.

This device utilizes Fairchild’s constant on-time control architecture to provide excellent transient response and to maintain a relatively constant switching frequency.

Switching frequency and sourcing over-current protection can be programmed to provide a flexible solution for various applications.

Output over-current, and thermal shutdown protections help prevent damage during fault conditions. A hysteresis feature restarts the device when normal operating temperature is reached.

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Product Status/Pricing/Packaging

Product Product & Eco Status *Pricing Packaging & Packing Info **Package Marking Convention Qualification Support Compliance Certificates
0 FAN23SV04TMPX Full Production
Green as of Mar 2012
$1.07  Details
1.1 x 5.5 x 5.0mm

Line 1:$Y (Fairchild logo)
&Z (Plant Code)
&3 (3-Digit Date Code)
Line 2:FAN23
Line 3:SV04T
ESD (CDM) :  2500  V
ESD (HBM) :  2000  V
RƟJA :  35  °C/W
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  • VIN Range: 7 V to 15 V Using Internal Linear Regulator for Bias
  • VIN Range: 4.5 V to 5.5 V with VIN/PVIN/PVCC Connected to Bypass Internal Regulator
  • High Efficiency
  • Continuous Output Current: 4 A
  • Internal Linear Bias Regulator
  • Internal VDDQ Resistor Divider
  • Excellent Line and Load Transient Response
  • Output Voltage Range: 0.5 to 1.5 V
  • Programmable Frequency: 200 kHz to 1.5 MHz
  • Programmable Soft-Start
  • Low Shutdown Current
  • Adjustable Sourcing Current Limit
  • Internal Boot Diode
  • Thermal Shutdown
  • Halogen and Lead Free, RoHS Compliant


  • Video Game Console
  • Workstation
  • Storage & Peripherals
  • Set Top Boxes
  • Server & Mainframe
  • Routers & LAN Switches
  • PC Server
  • Other Industrial
  • Other Data Processing
  • Other Consumer Electronics
  • Game Console
  • DVD/Set Top Boxes
  • Consumer
  • Broadband Access

Application Notes


High Efficiency Synchronous Buck Converter for DDR Termination

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Design Tools

Design Tool Design Tool
Synchronous Buck Regulator - TinyBuck™ Online Simulation Tool for TinyBuck Family (FAN23xx Devices)
ODT-00026 Online Simulation Tool for TinyBuck Family (FAN23xx Devices)

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