NCP5220A Datasheet, PDF (1/18 Pages) ON Semiconductor – 3−in−1 PWM Dual Buck and Linear Power Controller

NCP5220A
3−in−1 PWM Dual Buck and
Linear Power Controller
The NCP5220A 3−in−1 PWM Dual Buck and Linear Power
Controller, is a complete power solution for MCH and DDR memory.
This IC combines the efficiency of PWM controllers for the VDDQ
supply and the MCH core supply voltage with the simplicity of linear
regulator for the VTT termination voltage.
This IC contains two synchronous PWM buck controllers for
driving four external N−Ch FETs to form the DDR memory supply
voltage (VDDQ) and the MCH regulator. The DDR memory
termination regulator (VTT) is designed to track at half of the
reference voltage with sourcing and sinking current.
Protective features include, soft−start circuitry, undervoltage
monitoring of 5VDUAL, BOOT voltage and thermal shutdown. The
device is housed in a thermal enhanced space−saving DFN−20
package.
Features
• Incorporates Synchronous PWM Buck Controllers for VDDQ and
VMCH
• Integrated Power FETs with VTT Regulator Source/Sink up to 2.0 A
• All External Power MOSFETs are N−Channel
• Adjustable VDDQ and VMCH by External Dividers
• VTT Tracks at Half the Reference Voltage
• Fixed Switching Frequency of 250 kHz for VDDQ and VMCH
• Doubled Switching Frequency of 500 kHz for VDDQ Controller in
Standby Mode to Optimize Inductor Current Ripple and Efficiency
• Soft−Start Protection for All Controllers
• Undervoltage Monitor of Supply Voltages
• Overcurrent Protections for DDQ and VTT Regulators
• VTT Regulators Soft−Start Current Protection
• Fully Complies with ACPI Power Sequencing Specifications
• Short Circuit Protection Prevents Damage to Power Supply Due to
Reverse DIMM Insertion
• Thermal Shutdown
• 5x6 DFN−20 Package
• Pb−Free Package is Available*
Typical Applications
• DDR I and DDR II Memory and MCH Power Supply
*For additional information on our Pb−Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
http://onsemi.com
20
1
DFN−20
MN SUFFIX
CASE 505AB
MARKING DIAGRAM
N5220A
AWLYYWW G
G
1
N5220A = Device Code
A
= Assembly Location
WL
= Wafer Lot
YY
= Year
WW
= Work Week
G
= Pb−Free Package
(Note: Microdot may be in either location)
PIN CONNECTIONS
COMP
FBDDQ
SS
PGND
VTT
VDDQ
AGND
FBVTT
SLP_S5
FB1P5
SW_DDQ
BG_DDQ
TG_DDQ
BOOT
5VDUAL
COMP_1P5
SLP_S3
TG_1P5
BG_1P5
GND_1P5
NOTE: Pin 21 is the thermal pad
on the bottom of the device.
ORDERING INFORMATION
Device
Package
Shipping^†
NCP5220AMNR2 DFN−20 2500/Tape & Reel
NCP5220AMNR2G DFN−20 2500/Tape & Reel
(Pb−Free)
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
Brochure, BRD8011/D.
© Semiconductor Components Industries, LLC, 2005
1
December, 2005 − Rev. 4
Publication Order Number:
NCP5220A/D