NCP5314 ON Semiconductor, NCP5314 Datasheet - Page 8

• Manufacturer Part Number: NCP5314
• Description: Two/Three/Four-Phase Buck CPU Controller
• Manufacturer: ON Semiconductor

PIN DESCRIPTION
Pin No.
30−32
18−21
1−3,
10
12
13
14
15
16
17
22
23
24
25
26
27
28
29
11
4
5
6
7
8
9
GATE4−GATE1
Pin Symbol
V
ENABLE
PWRGD
DRVON
PWRLS
ID0
COMP
SGND
CS4N
CS4P
CS3N
CS3P
CS1P
CS1N
CS2P
CS2N
R
V
V
GND
V
V
I
SS
DRP
OSC
LIM
FFB
−V
CC
FB
ID5
Oscillator Frequency Adjust
Current Sense Reference
Current Sense Reference
Current Sense Reference
Current Sense Reference
Output of Current Sense
Fast Voltage Feedback
Remote Sense Ground
Amplifiers for Adaptive
Current Sense Input
Current Sense Input
Current Sense Input
Current Sense Input
Power Good Output
Power Good Sense
Voltage Positioning
Voltage Feedback
Total Current Limit
Error Amp Output
Channel Outputs
IC Power Supply
DAC VID Inputs
Drive Enable
Pin Name
Soft Start
Ground
Enable
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VID−compatible logic input used to program the converter output voltage.
All high on V
Voltage sensing pin for Power Good lower threshold.
Input of PWM comparator for fast voltage feedback, and also the inputs of
Power Good sense and overvoltage protection comparators
A capacitor between this pin and ground programs the soft start time.
Open collector output goes high when the converter output is in regulation.
Logic high enables MOSFET drivers, and logic low turns all MOSFETs off
through MOSFET drivers. Pulled to ground through internal 70 k resistor.
Ground connection for DAC and error amplifier. Provides remote sensing of
load ground.
The offset above DAC voltage is proportional to the sum of inductor current.
A resistor from this pin to V
Positioning. Leave this pin open for no Adaptive Voltage Positioning.
Error amplifier inverting input.
Provides loop compensation and is clamped by SS during soft start and
fault conditions. It is also the inverting input of PWM comparators.
Inverting input to current sense amplifier #4.
Non−inverting input to current sense amplifier #4.
Inverting input to current sense amplifier #3, and Phase 3 disable pin.
Non−inverting input to current sense amplifier #3, and Phase 3 disable pin.
IC power supply return. Connected to IC substrate.
PWM outputs to drive MOSFET driver ICs.
Power Supply Input for IC.
Resistor to ground programs the oscillator frequency, as shown in Oscillator
Frequency graph Figure 7.
Resistor divider between R
limit.
Non−inverting input to current sense amplifier #1.
Inverting input to current sense amplifier #1.
Non−inverting input to current sense amplifier #2.
Inverting input to current sense amplifier #2.
A voltage less than the threshold puts the IC in Fault Mode, discharging SS.
Connect to system VID
Hysteresis is provided to prevent chatter.
NCP5314
8
ID0
−V
ID4
generates fault.
PWRGD
FB
OSC
programs the amount of Adaptive Voltage
signal to control powerup sequencing.
Description
and ground programs the average current