NCP5316

http://onsemi.com

9

PIN DESCRIPTION

Pin No.

Pin Symbol

Pin Name

Description

1−6

DAC VID Inputs

VID−compatible logic input used to program the converter output

7

LGND

Logic Ground

IC analog ground; connected to IC substrate.

8, 9, 19, 20

NC

No Connect

For factory test only. Let these pins float.

10

SGND

Remote Sense Ground

Ground connection for DAC and error amplifier. Provides remote

sensing of load ground.

11

PWRGD

Power Good Output

Open collector output goes high when the converter output is in reg-

ulation.

12

PWRLS

Power Good Sense

Voltage sensing pin for Power Good lower threshold.

13

DRVON

Drive Enable

Logic high output enables MOSFET drivers, and logic low turns all

MOSFETs off through MOSFET drivers. Pulled to ground through

internal 70 kW resistor.

14

SS

Soft Start

A capacitor between this pin and ground programs the soft start time.

15

ENABLE

Enable

A voltage less than the threshold puts the IC in Fault Mode, dis-

up sequencing. Hysteresis is provided to prevent chatter.

16

Fast Voltage Feedback

Input of PWM comparator for fast voltage feedback, and also the

inputs of Power Good sense and overvoltage protection comparators

17

Voltage Feedback

Error amplifier inverting input.

18

COMP

Error Amp Output

Provides loop compensation and is clamped by SS during soft start

and fault conditions. It is also the inverting input of PWM compara-

tors.

21

CS6N

Current Sense Reference

Inverting input to current sense amplifier #6, and Phase 6 disable

pin.

22

CS6P

Current Sense Input

Non−inverting input to current sense amplifier #6, and Phase 6 dis-

able pin.

23

CS5N

Current Sense Reference

Inverting input to current sense amplifier #5.

24

CS5P

Current Sense Input

Non−inverting input to current sense amplifier #5.

25

CS4N

Current Sense Reference

Inverting input to current sense amplifier #4.

26

CS4P

Current Sense Input

Non−inverting input to current sense amplifier #4.

27

GND

Ground

Power supply return of Gate circuits.

28−33

GATE6−GATE1

Channel Outputs

PWM outputs to drive MOSFET driver ICs.

34

Gate Power Supply

35

Oscillator Frequency Adjust Resistor to ground programs the oscillator frequency, as shown in

Figure 5.

36

CS1P

Current Sense Input

Non−inverting input to current sense amplifier #1.

37

CS1N

Current Sense Reference

Inverting input to current sense amplifier #1.

38

CS2P

Current Sense Input

Non−inverting input to current sense amplifier #2.

39

CS2N

Current Sense Reference

Inverting input to current sense amplifier #2.

40

CS3P

Current Sense Input

Non−inverting input to current sense amplifier #3, and Phase 3 dis-

able pin.

41

CS3N

Current Sense Reference

Inverting input to current sense amplifier #3, and Phase 3 disable

pin.

42

Pulse−by−Pulse Limit

pulse−by−pulse limit of each phase.

43

Output of Current Sense

Amplifiers for Adaptive

Voltage Positioning:

“Droop” Pin

The offset above DAC voltage is proportional to the sum of inductor

tive Voltage Positioning. Leave this pin open for no Adaptive Voltage

Positioning.