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 18 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.


  • VIN Range: 7 V to 18 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
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Index Product Product &
Eco Status
Unit Price/
1K Order
Packing Method Convention Package Marking
0 FAN23SV04TMPX Full Production
Green as of Mar 2012

PQFN 5x5.5 34L -  Details
1.1 x 5.5 x 5.0mm,  TAPE REEL

PDF PQFN 5x5.5 34L  Drawing
Last Update: Jan 2015 PDF PQFN-34L-TB3, Packing Drawing
Last Update: Jun 2013
Line 1$Y (Fairchild logo)
&Z (Plant Code)
&3 (3-Digit Date Code)

Line 2FAN23

Line 3SV04T

ESD (CDM) 2500V

ESD (HBM) 2000V


RƟJC 2.7°C/W

Moisture Sensitivity Level (MSL) 1

Max Reflow Temp 260


If there is no sample button displayed at the top of the page, please contact one of the Fairchild distributors or your local sales office to obtain samples.
* Click here for further top mark packaging information for FAN23SV04T

This product is general usage and suitable for many different applications.
Application Note Description
AN-5074 PDFFAN23SV04T High-Efficiency Tracking Regulator Provides VDDQ Tracking VTT Supply or Programmable Tracking Ratio
Last Update : 28-Jun-2014
AN-FEBFAN23SV04T_LVA PDFUser Guide for FAN23SV04T_LVA Evaluation Board
Last Update : 30-Oct-2014

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