NCP5306 datasheet(7/24 Pages) ONSEMI

Part #	NCP5306

Description	Three?뭁hase VRM 9.0 Buck Controller

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Manufacturer	ONSEMI [ON Semiconductor]

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NCP5306

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ELECTRICAL CHARACTERISTICS (continued) (0°C < TA < 70°C; 0°C < TJ < 125°C; 9.5 V < VCC < 14 V; CGATEx = 100 pF,

CCOMP = 0.01μF, CSS = 0.1μF, CVCC = 0.1μF, RROSC = 32.4 kΩ, VOCSET = 0.54 V, DAC Code 01110; unless otherwise stated.)

Parameter

Unit

Max

Typ

Min

Test Conditions

Current Sense Amplifiers

OCSET Input Bias Current

OCSET = 0 V

−

0.1

1.0

μA

Current Sense Input to OCSET

Gain

OCSET/(CSx−CSREF), 0.25 V <

OCSET < 0.6 V, GATEx not

switching

3.2

3.7

4.3

V/V

Current Limit Filter Slew Rate

CSREF = 1.1 V, CSx = 1.0 V, pulse

CSx to 1.16 V, Note 5.

2.0

5.0

13

mV/μs

General Electrical Specification

VCC Operating Current

COMP = 0.3 V (no switching)

−

20

30

mA

UVLO Start Threshold

SS Charging Gates Switching

8.5

9.0

9.5

V

UVLO Stop Threshold

Gates not switching, SS & COMP

discharging

7.5

8.0

8.5

V

UVLO Hysteresis

Start−Stop

0.8

1.0

1.2

V

5. Guaranteed by design. Not tested in production.

PACKAGE PIN DESCRIPTION

Pin Number

Pin Symbol

Pin Name

Function

1

GND

Ground

IC power supply return. Connected to IC substrate.

2

OCSET

Overcurrent Set

Resistor divider from ROSC to GND. Programs the threshold of the hiccup

overcurrent protection.

3

ROSC

Oscillator Frequency

Adjust

ROSC is a regulated 1.0 V output and programs the oscillator frequency

with a resistor to GND.

4−6

CS3−CS1

Current Sense Inputs

Non−inverting inputs to the current sense amplifiers.

7, 20

NC

No Connect

Pins not connected to IC.

8

CSREF

Current Sense Reference

Inverting input to the current sense amplifiers and reference for Power Good.

9

VDRP

Current Sense Amp

Output

Programs the voltage drop due to loading. A resistor from VDRP to FB

programs the amount of Adaptive Voltage Positioning. Omitting this

resistor defeats the AVP function.

10

VFB

Voltage Feedback

Error Amplifier inverting input. Input bias current is used to program AVP

light load offset via a resistor connected to the converter output voltage.

11

COMP

Error Amp Output and

PWM Comparator Input

Provides loop compensation and is clamped by SS.

12

SS

Soft Start

Controls fault timing and startup.

13

PWRGD

Power Good Output

Open collector output, which is “low” when the converter output is out of

regulation.

14

PWRGDS

Power Good Sense

A resistor divider from VOUT to GND programs the Power Good lower

threshold.

15−19

VID4−VID0

DAC VID Inputs

TTL−compatible logic input used to program the converter output voltage.

Internal 50 kΩ pull−ups to 3.3 V via a blocking diode are provided. All high

generates fault.

21−23

GATE3−1

Channel Outputs

PWM outputs to drive FET driver IC.

24

VCC

Supply Input

IC bias input.

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