FAN6555MX

FAN6555MX Datasheet

FAN6555

Part	Datasheet
FAN6555MX	FAN6555MX (pdf)

Related Parts	Information
FAN6555M	FAN6555M

PDF Datasheet Preview
FAN6555 2A DDR Bus Termination Regulator • Can source and sink up to 2A continous, 3A peak • No heatsink required • Integrated Power MOSFETs • Generates termination voltages for DDR SDRAM • VREF input available for external voltage divider • Separate voltages for VCCQ and PVDD • Buffered VREF output • VOUT of ±3% or less at 2A • Minimum external components • 16-pin SOIC package • -40°C to +85°C operating temperature range • Shutdown for standby or suspend mode operation • Thermal Shutdown 130ºC The FAN6555 switching regulator is designed to convert voltage supplies ranging from 2.3V to 4V into a desired output voltage or termination voltage for DDR SDRAM memory. The FAN6555 can be implemented to produce regulated output voltages in two different modes. In the default mode, when the VREF pin is open, the FAN6555 output voltage is 50% of the voltage applied to VCCQ. The FAN6555 can also be used to produce various voltages by forcing a voltage on the VREFIN pin. In this case, the output voltage follows the input VREFIN voltage. The switching regulator is capable of sourcing or sinking up to 2A of current while regulating an output VTT voltage to within 3% or less. Transient output currents of ±3A can also be accommodated. The FAN6555 can also be used in conjunction with series termination resisitors to provide an excellent voltage source for active termination schemes of high speed transmission lines as those seen in high speed memory buses and distributed backplane designs. Block Diagram VCCQ AVCC VREFOUT VREFIN 11 AGND 13 + VREF BUFFER OSCILLATOR/ RAMP GENERATOR + ERROR AMP VFB 10 1 VDD 9 VDD 12 SHDN PVDD1 PVDD2 VL1 VOUT RAMP COMPARATOR 6 VL2 VOUT DGND 8 PGND1 PGND2 FAN6555 FAN6555 16-Pin SOIC M16 VDD PVDD1 VL1 PGND1 PGND2 VL2 PVDD2 DGND TOP VIEW AVCC VCCQ VREFOUT AGND SHDN VREFIN VFB VDD Pin Description Pin Name Function VDD Digital supply voltage PVDD1 Voltage supply for internal power transistors VL1 Output voltage/ inductor connection PGND1 Ground for output power transistors PGND2 Ground for output power transistors VL2 Output voltage/inductor connection PVDD2 Voltage supply for internal power transistors DGND Digital ground Ordering Information Part Number FAN6555M FAN6555MX Temperature Range -40°C to +85°C -40°C to +85°C PRODUCT SPECIFICATION Package 16-Pin SOIC M16 16-Pin SOIC in tape-and-reel DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. LIFE SUPPORT POLICY FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: Life support devices or systems are devices or systems which, a are intended for surgical implant into the body, or b support or sustain life, or c whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in significant injury of the user. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. 8/4/03 0.0m 002 Stock#DS30006555 2003 Fairchild Semiconductor Corporation

PDF Datasheet Preview

FAN6555
2A DDR Bus Termination Regulator
• Can source and sink up to 2A continous, 3A peak
• No heatsink required
• Integrated Power MOSFETs
• Generates termination voltages for DDR SDRAM
• VREF input available for external voltage divider
• Separate voltages for VCCQ and PVDD
• Buffered VREF output
• VOUT of ±3% or less at 2A
• Minimum external components
• 16-pin SOIC package
• -40°C to +85°C operating temperature range
• Shutdown for standby or suspend mode operation
• Thermal Shutdown 130ºC

The FAN6555 switching regulator is designed to convert voltage supplies ranging from 2.3V to 4V into a desired output voltage or termination voltage for DDR SDRAM memory. The FAN6555 can be implemented to produce regulated output voltages in two different modes. In the default mode, when the VREF pin is open, the FAN6555 output voltage is 50% of the voltage applied to VCCQ. The FAN6555 can also be used to produce various voltages by forcing a voltage on the VREFIN pin. In this case, the output voltage follows the input VREFIN voltage. The switching regulator is capable of sourcing or sinking up to 2A of current while regulating an output VTT voltage to within 3% or less. Transient output currents of ±3A can also be accommodated.

The FAN6555 can also be used in conjunction with series termination resisitors to provide an excellent voltage source for active termination schemes of high speed transmission lines as those seen in high speed memory buses and distributed backplane designs.

Block Diagram

VCCQ AVCC VREFOUT

VREFIN 11

AGND 13
+ VREF BUFFER

OSCILLATOR/ RAMP

GENERATOR
+ ERROR AMP

VFB 10
1 VDD
9 VDD
12 SHDN

PVDD1 PVDD2

VL1 VOUT

RAMP COMPARATOR
6 VL2 VOUT

DGND 8

PGND1 PGND2

FAN6555

FAN6555 16-Pin SOIC M16

VDD PVDD1

VL1 PGND1 PGND2

VL2 PVDD2 DGND

TOP VIEW

AVCC VCCQ VREFOUT AGND SHDN VREFIN VFB VDD

Pin Description

Pin Name

Function

VDD Digital supply voltage

PVDD1 Voltage supply for internal power transistors

VL1 Output voltage/ inductor connection

PGND1 Ground for output power transistors

PGND2 Ground for output power transistors

VL2 Output voltage/inductor connection

PVDD2 Voltage supply for internal power transistors

DGND Digital ground
Ordering Information

Part Number FAN6555M FAN6555MX

Temperature Range -40°C to +85°C -40°C to +85°C

PRODUCT SPECIFICATION

Package 16-Pin SOIC M16 16-Pin SOIC in tape-and-reel

DISCLAIMER

FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.

LIFE SUPPORT POLICY

FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein:

Life support devices or systems are devices or systems which, a are intended for surgical implant into the body, or b support or sustain life, or c whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in significant injury of the user.

A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.
8/4/03 0.0m 002 Stock#DS30006555 2003 Fairchild Semiconductor Corporation

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Datasheet ID: FAN6555MX 513957