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PDF NCP81245 Data sheet ( Hoja de datos )
| Número de pieza | NCP81245 | |
| Descripción | Three-Rail Output Controller | |
| Fabricantes | ON Semiconductor | |
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NCP81245
Three-Rail Output
Controller with Single Intel
Proprietary Interface for
Desktop and Notebook CPU
Applications
www.onsemi.com
The NCP81245 (3+3+1 phase) three−output buck solution is
optimized for Intel’s IMVP8 CPUs.
The two multi−phase rail control systems are based on Dual−Edge
pulse−width modulation (PWM) combined with DCR current sensing
providing an ultra fast initial response to dynamic load events and
reduced system cost.
The single−phase rail 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 NCP81245 has an ultra−low offset current
monitor amplifier with programmable offset compensation for
high−accuracy current monitoring.
Three−Phase Rails Feature
• Dual Edge Modulation for Fastest Initial Response to Transient
Loading
• High Performance Operational Error Amplifier
• Digital Soft Start Ramp
• Dynamic Reference Injection
• Accurate Total Summing Current Amplifier
• Dual High Impedance Differential Voltage and Total Current Sense
Amplifiers
• Phase−to−Phase Dynamic Current Balancing
• True Differential Current Balancing Sense Amplifiers for Each Phase
• Adaptive Voltage Positioning (AVP)
• Switching Frequency Range of 300 kHz − 750 kHz
• Vin range 4.5 V to 20 V
• Startup into Pre−Charged Loads While Avoiding False OVP
• UltraSonic Operation
• These are Pb−Free Devices
MARKING
DIAGRAM
1 52
QFN52
MN SUFFIX
CASE 485BE
NCP81245
FAWLYYWW
G
F = Wafer Fab
A = Assembly Site
WL = Lot ID
YY = Year
WW = Work Week
G = Pb−Free Package
ORDERING INFORMATION
Device
Package Shipping†
NCP81245MNTXG
QFN52 2500 / Tape
(Pb−Free)
& Reel
†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.
Single−Phase Rail Features
• Enhanced RPM Control System
• Ultra Low Offset IOUT Monitor
• Dynamic VID Feed−Forward
• Programmable Droop Gain
• Zero Droop Capable
• Thermal Monitor
• UltraSonic Operation
• Adjustable Vboot
• Digitally Controlled Operating Frequency
Applications
• Desktop & Notebook Processors
• Gaming
© Semiconductor Components Industries, LLC, 2016
July, 2016 − Rev. 5
1
Publication Order Number:
NCP81245/D
1 page  
NCP81245
FROM SVID
INTERFACE
DAC
DAC
FEED−
FORWARD
DAC FEEDFORWARD
CURRENT
DAC
gm
VSN
VSP
25 VSN_1a
24 VSP_1a
gm
Av=1
26 COMP_1a
DROOP
CURRENT
CURRENT 29 CSP_1a
SENSE AMP 28 CSN_1a
DRVON
OVP OVP REF
COMP OVP
PWM
GENERATOR
CURR
OCP
gm OVERCURRENT
PROGRAMMING
OVERCURRENT
OCP
COMPARATORS
OCP REF
27 ILIM_1a
RAMP
DAC
VRMP
FREQ
RAMP
GENERATOR
PWM
PS#
gm
IOUT
ZERO
CURRENT
DETECTION
CURRENT 30 IOUT_1a
MONITOR
22 PWM_1a
Figure 4. Block Diagram of Enhanced RPM Architecture
www.onsemi.com
5
5 Page 
NCP81245
Table 4. ELECTRICAL CHARACTERISTICS
Unless otherwise stated: −40°C < TA < 100°C; 4.75 V < VCC < 5.25 V ; CVCC = 0.1mF
Parameter
Test Conditions
Min Typ Max Unit
PWM OUTPUTS
Output High Voltage
Sourcing 500 mA
VCC −
0.2
V
Output Mid Voltage
No Load
1.9 2.0 2.1
V
Output Low Voltage
Sinking 500 mA
0.3 V
Rise and Fall Time
CL (PCB) = 50 pF,
DVo =10% to 90% of VCC
5 ns
Tri−State Output Leakage
Gx = 2.0 V, x = 1−2, EN = Low
−1
1 mA
PHASE DETECTION
CSPX Phase Disable Voltage
4.75 V
Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product
performance may not be indicated by the Electrical Characteristics if operated under different conditions.
www.onsemi.com
11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet NCP81245.PDF ] | |
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