NCP5381A datasheet(10/34 Pages) ONSEMI

Part #	NCP5381A

Description	2/3/4 Phase Buck Controller for VR10 and VR11 Pentium IV Processor Applications

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Manufacturer	ONSEMI [ON Semiconductor]

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NCP5381A

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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

Units

Max

Typ

Min

Test Conditions

VDRP Adaptive Voltage Positioning Amplifier

Current Sense Input to VDRP Gain

−60 mV < (CSx−CSxN)

< +60 mV, TA = 25°C

5.7

6.0

6.3

V/V

Current Sense Input to VDRP Output

−3dB Bandwidth (Note 1)

CL = 330 pF to GND,

RL = 10 kW to GND

−

7.2

−

MHz

Current Sense Input to VDRP Output

Slew Rate (Note 1)

DV(CSx−CSxN) = 25 mV (all

phases), 1.3 V < Vout < 1.9 V,

CL = 330 pF to GND,

Load = ±400 mA

−

3.7

−

V/ms

Current Summing Amp Output Offset

Voltage

CSx – CSxN = 0, CSx =1.0 V

−15

−

+15

mV

Maximum VDRP Output Voltage

CSx − CSxN = 0.12 V

(all phases),

ISOURCE = 1.0 mA

3.02

−

V

Minimum VDRP Output Voltage

CSx − CSxN = −0.12 V

(all phases),

ISINK = 1.0 mA

−

0.5

V

Output Source Current (Note 1)

VDRP = 2.9 V

−

9.0

−

mA

Output Sink Current (Note 1)

VDRP = 1.0 V

−

2.0

−

mA

Current Sense Amplifiers

Input Bias Current

CSx = CSxN = 1.4 V

−200

−100

−

nA

Common Mode Input Voltage Range

(Note 1)

−0.3

−

2.0

V

Differential Mode Input Voltage Range

−120

−

120

mV

Input Offset Voltage (Note 1)

CSx = CSxN = 1.0 V

−3.0

−

3.0

mV

Current Sense Input to

PWM Comparator Input Gain

0 mV < (CSx−CSxN) < 25 mV

TA = 25°C

5.7

6.0

6.3

V/V

Oscillator

Switching Frequency Range (Note 1)

100

−

1000

kHz

Switching Frequency Accuracy

(Note 1)

ROSC = 100 kW, 2 or 4−phase

93.6

104

114.4

kHz

Switching Frequency Accuracy

ROSC = 49.9 kW, 2 or 4−phase

184.5

205

225.5

kHz

Switching Frequency Accuracy

ROSC = 24.9 kW, 2 or 4−phase

360

400

440

kHz

Switching Frequency Accuracy

ROSC = 10 kW, 2 or 4−phase

829

921

1013

kHz

Switching Frequency Accuracy

(Note 1)

ROSC = 100 kW, 3−phase

90

100

110

kHz

Switching Frequency Accuracy

ROSC = 49.9 kW, 3−phase

178.2

198

217.8

kHz

Switching Frequency Accuracy

ROSC = 24.9 kW, 3−phase

351

390

429

kHz

Switching Frequency Accuracy

ROSC = 10 kW, 3−phase

818

909

1000

kHz

ROSC Output Voltage

10 kW < ROSC < 49.9 kW

1.92

2.00

2.08

V

ROSC Output Voltage (Note 1)

49.9 kW < ROSC < 100 kW

−

2.00

−

V

1. Guaranteed by design. Not tested in production.

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