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NCP81251MNTXG Datasheet(PDF) 11 Page - ON Semiconductor

Part # NCP81251MNTXG
Description  Single-Phase Voltage Regulator
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP81251MNTXG Datasheet(HTML) 11 Page - ON Semiconductor

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NCP81251
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DETAILED DESCRIPTION
General
The NCP81251, a single−phase synchronous buck
regulator, integrates power MOSFETs to provide a
high−efficiency and compact−footprint power management
solution for new generation computing CPUs. The device is
able to deliver up to 14 A TDC output current on an
adjustable output with SVID interface. Operating in high
switching frequency up to 1.2 MHz allows employing small
size inductors and capacitors while maintaining high
efficiency due to integrated solution with high performance
power MOSFETs. Current−mode RPM control with
feedforward from both input power supply and output
voltage ensures stable operation over wide operation
condition.
Current−Mode RPM Operation
The
NCP81251
operates
with
the
current−mode
Ramp−Pulse−Modulation (RPM) scheme in PS0/1/2/3
operation modes. In forced CCM mode, the inductor current
is always continuous and the device operates in quasi−fixed
switching frequency, which has a typical value programmed
by users through a resistor at pin FREQ. In auto CCM/DCM
mode, the inductor current is continuous and the device
operates in quasi−fixed switching frequency in medium and
heavy load range, while the inductor current becomes
discontinuous and the device automatically operates in PFM
mode with an adaptive fixed on time and variable switching
frequency in light load range.
Serial VID interface (SVID)
The NCP81251 supports Intel serial VID interface. It
communicates with the microprocessor through three wires
(SCLK, SDIO, ALERT#). For NCP81251, VID code
change rate is controlled by the SVID interface with three
options. Information regarding SVID interface can be
obtained from Intel.
Boot Voltage and SVID Address
Table 5 shows two boot voltage options of 1.0 V and 1.1 V
programmed by an external 1% resistor Rvboot from Vboot
pin to GND, which programs SVID address as well. Both
Vboot voltage and SVID address are set on power up and
cannot be changed after the initial power up sequence is
complete.
Table 5. BOOT VOLTAGE AND SVID ADDRESS CONFIGURATION
Rvboot
(
W)
Vboot Pin Voltage (mV)
Address
Vboot
(V)
Min
Typ
Max
0
0
0
102
0x0
1.0
14
.0k
102
140
180
0x1
1.0
22.1
k
180
219
258
0x2
1.0
30.1
k
258
301
344
0x3
1.0
39.2
k
344
391
438
0x4
1.0
48.7
k
438
484
531
0x5
1.0
57.6
k
531
578
625
0x6
1.0
68.1
k
625
676
727
0x7
1.0
78.7
k
727
781
836
0x8
1.0
88.7
k
836
894
953
0x0
1.1
100
k
953
1007
1062
0x1
1.1
113
k
1062
1125
1188
0x2
1.1
124
k
1188
1250
1312
0x3
1.1
137
k
1312
1378
1445
0x4
1.1
150
k
1445
1511
1578
0x5
1.1
165
k
1578
1648
1719
0x6
1.1
178
k
1719
1789
1859
0x7
1.1
196
k
1859
1950
0x8
1.1


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