Two-Phase Desktop CPU Core Supply Controllers

with Controlled VID Change

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5

ELECTRICAL CHARACTERISTICS

unless otherwise noted.) (Note 1)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

GENERAL

MAX1937

6

24

MAX1938/MAX1939

8

24

V

4.5

5.5

V

VLG Operating Range

4.5

6.5

V

FB above threshold (no switching)

40

µA

FB above threshold (no switching)

2.5

mA

VLG Operating Supply Current

FB above threshold (no switching)

20

60

µA

EN = GND

5

µA

EN = GND, VID_ not connected

100

µA

VLG Shutdown Current

EN = GND

5

µA

TIME Output Voltage

1.96

2.04

V

ILIM Input Bias

-250

+250

nA

VPOS Output Voltage

CS_ = GND, VPOS connected to REF through a 75k

Ω

resistor

1.96

2.04

V

REFERENCE

Reference Voltage

-50µA

1.98

2.02

V

SOFT-START

MAX1937

1.1

5.5

MAX1938

1.5

6.6

Ramp Period

MAX1939

1.3

7.0

ms

ERROR AMPLIFIER

GNDS Input Bias Current

-5

+5

µA

Output Regulation Voltage

Accuracy

-1

+1

%

FAULT PROTECTION

4.00

4.45

V

VLG UVLO Threshold

Rising or falling VLG

4.00

4.45

V

MAX1937/MAX1938

1.97

2.03

Output Overvoltage Fault

Threshold

Rising and falling

MAX1939

2.215

2.285

V

Output UVLO Threshold

Rising and falling percentage of the nominal

regulation voltage

65

75

%

CURRENT LIMIT

135

165

90

110

Current-Limit Threshold

45

55

mV