NCP5318 datasheet(6/31 Pages) ONSEMI | Two/Three/Four−Phase Buck CPU Controller

6 page

NCP5318

http://onsemi.com

ELECTRICAL CHARACTERISTICS (0°C < TA < 70°C; VCC = 12 V; CGATEx = 100 pF, CCOMP = 0.01 mF,

CSS = 0.1 mF, CVCC = 0.1 mF, RROSC = 95.3 kW, V(ILIM) = 1.0 V, DAC Code 010100; unless otherwise noted)

Characteristic

Test Conditions

Min

Typ

Max

Unit

VID Inputs

Input Threshold

VID5, VID4, VID3, VID2, VID1, VID0

400

600

800

VID Pin Current

VID5, VID4, VID3, VID2, VID1, VID0 = 0 V

−

0.2

1.0

SGND Bias Current

SGND < 300 mV, All DAC Codes

SGND Voltage Compliance Range

−

−200

−

300

Power Good

Upper Threshold, Offset from No Load Set Point

115

Lower Threshold Constant

PWRGDS/No Load Set Point

0.475

0.505

0.525

V/V

Output Low Voltage

VFFB = 1.0 V, IPWRGD = 4.0 mA

−

0.18

0.40

Delay

VFFB high to PWRGD high

1.0

2.0

4.0

Overvoltage Protection

OVP Threshold above VID

−

170

215

250

Enable Input

Start Threshold

Gates switching, SS high

−

0.8

Stop Threshold

Gates not switching, SS low

0.4

−

Hysteresis

−

100

170

−

Input Pull−Up Voltage

1.0 MW to GND

2.7

2.9

3.3

Input Pull−Up Resistance

−

7.0

Error Amplifier

VFB Bias Current

−

0.1

1.0

COMP Source Current

COMP = 0.5 V to 2.0 V

100

COMP Sink Current

−

100

Transconductance

(Note 2)

1.1

1.3

1.5

mmho

Open Loop DC Gain

(Note 2)

−

Unity Gain Bandwidth

CCOMP = 30 pF (Note 2)

−

4.0

−

MHz

PSRR @ 1.0 kHz

(Note 2)

−

COMP Max Voltage

VFB = 0 V

2.4

2.9

−

COMP Min Voltage

VFB = 1.6 V

−

150

PWM Comparators

Minimum Pulse Width

Measured from CSxP to GATEx,

VFB = CSxN = 0.5, COMP = 0.5 V,

60 mV step between CSxP and CSxN;

Measure at GATEx = 1.0 V (Note 2)

−

100

Transient Response Time

Measured from CSxN to GATEx,

COMP = 2.1 V, CSxP = CSxN = 0.5 V,

CSxN stepped from 1.2 V to 2.0 V (Note 2)

−

Channel Startup Offset

CSxP = CSxN = VFB = 0, Measure Vcomp

when GATEx switch high

0.35

0.62

0.75

Artificial Ramp Amplitude

50% duty cycle

−

175

−

MOSFET Driver Enable (DRVON)

Output High

DRVON floating

2.3

−

Output Low

I = 100 mA

−

0.2

Pull−Down Resistance

DRVON = 1.5 V, ENABLE = 0 V,

R = 1.5 V/I(DRVON)

140

Source Current

DRVON = 1.5 V

0.5

3.0

6.5

2. Guaranteed by design, not tested in production.

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