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PDF NCP81255 Data sheet ( Hoja de datos )
| Número de pieza | NCP81255 | |
| Descripción | Single-Phase Voltage Regulator | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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NCP81255
Single‐Phase Voltage
Regulator with Intel
Proprietary Interface for
Computing Applications
The NCP81255 is a high-performance, low-bias current,
single-phase regulator with integrated power MOSFETs intended to
support a wide range of computing applications. The device is able to
deliver up to 14 A TDC output current on an adjustable output with
Intel proprietary interface interface. Operating in high switching
frequency up to 1.2 MHz allows employing small size inductor and
capacitors. The controller makes use of ON Semiconductor’s patented
high performance RPM operation. RPM control maximizes transient
response while allowing for smooth transitions between
discontinuous-frequency-scaling operation and continuous-mode
full-power operation. The NCP81255 has an ultra-low offset current
monitor amplifier with programmable offset compensation for
high-accuracy current monitoring.
Features
• Auto DCM Operation in High Current Power States
• High Performance RPM Control System
• IMVP8 Intel proprietary interface Support
• Ultra Low Offset IOUT Monitor
• Dynamic VID Feed-Forward
• Programmable Droop Gain
• Zero Droop Capable
• Supports IMVP8 Intel proprietary interface Addresses
• PSYS Input Monitor
• Thermal Monitor
• UltraSonic Operation
• Digitally Controlled Operating Frequency
• QFN40 5 mm × 5 mm Package
• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
Applications
• IMVP8 Rail1, Rail3, and Rail4
www.onsemi.com
1 40
QFN40
CASE 485DY
MARKING DIAGRAM
1
NCP81255
FAWLYYWW
G
NCP81255 = Specific Device Code
F = Wafer Fab
A = Assembly Location
WL = Lot ID
YY = Year
WW = Work Week
G = Pb-Free Package
ORDERING INFORMATION
Device
Package
Shipping†
NCP81255MNTXG QFN40 3000 / 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, 2016
August, 2016 − Rev. 2
1
Publication Order Number:
NCP81255/D
1 page  
NCP81255
Table 1. NCP81255 PIN DESCRIPTIONS (continued)
Pin No.
Symbol
Description
19
PGND
Power Ground. Power Supply Ground Pins, Connected to Source of Internal LS FET
20
PGND
Power Ground. Power Supply Ground Pins, Connected to Source of Internal LS FET
21 SW Switch Node. Pins to be Connected to an External Inductor. These Pins are Interconnection
between Internal HS and LS FETs
22 SW Switch Node. Pins to be Connected to an External Inductor. These Pins are Interconnection
between Internal HS and LS FETs
23 SW Switch Node. Pins to be Connected to an External Inductor. These Pins are Interconnection
between Internal HS and LS FETs
24 GL Gate of LS FET
25 GL Gate of LS FET
26
PGND
Power Ground. Power Supply Ground Pins, Connected to Source of Internal LS FET
27
PVCC
Voltage Supply of Gate Drivers. A 4.7 mF or Larger Ceramic Capacitor Bypasses this Input to GND,
Placed as Close to the Pin as Possible
28
IMAX
ICCMAX Register Program
29
TSENSE
External Temperature Sense Network is Connected to this Pin
30
DOSC/ADDR/
Programming for FSW, Intel proprietary interface Address, and VBOOT. A Resistor to GND Programs
VBOOT
these Values during Start-up, per Look-up Table
31
PSYS
System Power Signal Input. A Resistor to Ground Scales this Signal
32
VSP
Differential Output Voltage Sense Positive
33
VSN
Differential Output Voltage Sense Negative
34
COMP
Compensation
35 ILIM Current-Limit Program
36
CSN
Differential Current Sense Negative
37
CSP
Differential Current Sense Positive
38
IOUT
IOUT Gain Program
39
VCC
Power Supply Input Pin of Control Circuits. A 1 mF or Larger Ceramic Capacitor Bypasses this Input
to Ground, Placed Close to the Controller
40 EN Enable
41
GND
Flag. Analog Ground. Ground of Internal Control Circuits
42 VIN Flag. Input Voltage for HS FET Drain. 22 mF or More Ceramic Caps must Bypass this Input to
Power Ground. Place Close to Pins
43
PGND
Flag. Power Ground. Power Supply Ground Pins, Connected to Source of Internal LS FET.
44 GL Flag. Gate of LS FET
www.onsemi.com
5
5 Page 
NCP81255
GENERAL
The NCP81255 is a single phase IMVP8 Intel proprietary
interface controller with a built in gate driver. The controller
makes use of a digitally enhanced high performance current
mode RPM control method that provides excellent transient
response while minimizing transient aliasing. The average
operating frequency is digitally stabilized to remove
frequency drift under all continuous mode operating
conditions. At light load the NCP81255 automatically
transitions into DCM operation to save power.
Switching Frequency, Intel proprietary interface
Address, and Boot Voltage Programming
FSW, address, and VBOOT are during power up on
a single pin. A 10 mA current is sourced from the pin and the
resulting voltage is measured. This is compared with the
thresholds and the corresponding values for FSW, VBOOT,
and Intel proprietary interface address are configured. These
values are programmed on power up and cannot be changed
after the initial power up sequence is complete.
Serial VID Interface (Intel proprietary interface)
For Intel proprietary interface communication details
please contact Intel®, Inc.
Table 5. SWITCHING FREQUENCY
Resistor
1 10 kW
2 13 kW
3 16 kW
4 19.2 kW
5 22.5 kW
6 26 kW
7 29.6 kW
8 33.5 kW
9 37.4 kW
10 41.5 kW
11 45.8 kW
12 50.2 kW
13 54.8 kW
14 59.5 kW
15 64.5 kW
16 69.6 kW
17 75 kW
18 80.6 kW
19 86.5 kW
20 92.6 kW
21 99 kW
22 105.5 kW
23 112.5 kW
24 119.6 kW
25 127 kW
26 134.8 kW
27 143 kW
28 151.4 kW
29 160.3 kW
30 169.5 kW
31 180 kW
32 210 kW
FSW
1.2 MHz
1.1 MHz
1.0 MHz
900 kHz
800 kHz
700 kHz
600 kHz
1.2 MHz
1.1 MHz
1.0 MHz
900 kHz
800 kHz
700 kHz
600 kHz
1.2 MHz
1.1 MHz
1.0 MHz
900 kHz
800 kHz
700 kHz
600 kHz
1.2 MHz
1.1 MHz
1.0 MHz
900 kHz
800 kHz
700 kHz
600 kHz
700kHz
700kHz
700 kHz
700 kHz
Address
0
0
0
0
0
0
0
1
1
1
1
1
1
1
2
2
2
2
2
2
2
3
3
3
3
3
3
3
0
1
2
3
VBOOT
0V
0V
0V
0V
0V
0V
0V
0V
0V
0V
0V
0V
0V
0V
1.05 V
1.05 V
1.05 V
1.05 V
1.05 V
1.05 V
1.05 V
0V
0V
0V
0V
0V
0V
0V
1.05 V
1.05 V
0V
1.05 V
www.onsemi.com
11
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet NCP81255.PDF ] | |
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