NCP5391 datasheet(10/26 Pages) ONSEMI

Part #	NCP5391

Description	2/3 Phase Buck Controller for VR11 Pentium IV Processor Applications

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Manufacturer	ONSEMI [ON Semiconductor]

Direct Link	http://www.onsemi.com

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NCP5391

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10

ELECTRICAL CHARACTERISTICS

(0

°C < TA < 70°C; 0°C < TJ < 85°C; 10.8 V < VCC < 13.2 V; All DAC Codes; CVCC = 0.1 mF, FSW = 400 kHz, unless otherwise stated)

Parameter

Unit

Max

Typ

Min

Test Conditions

MODULATORS (PWM COMPARATORS)

PWM Comparator Offset Mismatch

(Note 1)

Between any 2 phases,

FS = 400 kHz

-

40

mV

Phase Angle Error

Between adjacent phases,

FS = 400 kHz

-15

-

15

°

Propagation Delay (Note 1)

Ramp/Comp crossing to Gx high

-

20

-

ns

Propagation Delay (Note 1)

Ramp/Comp crossing to Gx low

-

20

-

ns

PWM OUTPUTS

Output High Voltage

Sourcing 500

mA

3.3

4.0

4.7

V

Output Low Voltage

Sinking 500

mA

-

25

100

mV

Rise Time

CL = 20 pF, DVo = 0.3 to 2.0 V

-

10

-

ns

Fall Time

CL = 20 pF, DVo = Vmax to 0.7 V

-

10

-

ns

Output Impedance – LO State

Resistance to GND (Gx = LO)

-

50

-

W

G3 Gate Pin Source Current during

Phase Detect

-

70

-

mA

Phase Detection Period

-

50

-

ms

G3 Phase Detect Threshold

Resistance

-

1.0

k

W

GATE DRIVER ENABLE (DRVON)

Output High Voltage

Sourcing 500

mA

4.0

5.3

5.5

V

Output Low Voltage

Sinking 500

mA

-

50

200

mV

Rise Time

CL (PCB) = 20 pF,

DVo = 10% to 90%

-

25

-

ns

Fall Time

CL (PCB) = 20 pF,

DVo = 10% to 90%

-

25

-

ns

Internal Pulldown Resistance

VCC < UVLO Threshold

-

70

140

k

W

VR_RDY (POWER GOOD) OUTPUT

Saturation Voltage

ISINK = 10 mA

-

0.4

V

Rise Time

External pullup of 1.0 k

W to 1.25 V, CLOAD = 20 pF,

DVo = 10% to 90%

-

150

ns

Output Voltage at Power-up (Note 1)

External VR_RDY pullup resistor of 2.0 k

W to 5.0 V,

tR_VCC ≤ 3 x tR_5V,

100

ms ≤ tR_VCC ≤ 20 ms

-

1.0

V

High – Output Leakage Current

VR_RDY = 5.5 V via 1.0 K

-

1.0

mA

Upper Threshold Voltage

VCORE increasing,

DAC = 1.3 V

-

300

-

mV

below

DAC

Rising Delay

VCORE increasing

0.3

1.40

2.0

ms

Falling Delay

VCORE decreasing

-

5.0

-

ms

SOFT-ST ART

SS Pin Source Current

ENABLE = HI, VSS PIN < 1.1 V

-

5.0

-

mA

SS Pin Source Current

ENABLE = HI, VSS PIN > 1.15 V, VR11 SS Mode

Only

125

-

mA

Soft-Start Ramp Time

CSS = 0.01 mF, DRVON = HI to VSS PIN = 1.1 V

1.5

2.2

3.0

ms

SS Pin Discharge Voltage

ENABLE = LO

-

50

mV

1. Guaranteed by design. Not tested in production.

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