Two-Phase Desktop CPU Core Supply Controllers

with Controlled VID Change

2

_______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

EN, GNDS, VPOS, REF, VID_,

PGND to GND .......................................................-0.3V to +0.3V

CS1, CS2 to GND ......................................................-2V to +28V

VLG to GND..............................................................-0.3V to +7V

BST1, BST2 to GND ...............................................-0.3V to +35V

LX1 to BST1..............................................................-7V to +0.3V

LX2 to BST2..............................................................-7V to +0.3V

28-Pin QSOP (derate 20.8mW/°C above +70°C)......860.2mW

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature ......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

ELECTRICAL CHARACTERISTICS

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

GENERAL

MAX1937

6

24

MAX1938/MAX1939

8

24

V

4.5

5

5.5

V

VLG Operating Range

4.5

6.5

V

FB above threshold (no switching)

20

40

µA

FB above threshold (no switching)

1.4

2.5

mA

VLG Operating Supply Current

FB above threshold (no switching)

20

60

µA

EN = GND

<1

5

µA

EN = GND, VID_ not connected

50

100

µA

VLG Shutdown Current

EN = GND

<1

5

µA

TIME Output Voltage

1.96

2.00

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

2.0

2.04

V

REFERENCE

Reference Voltage

-50µA

1.987

2.000

2.013

V

SOFT-START

MAX1937

1.1

5.5

MAX1938

1.5

6.2

Ramp Period

MAX1939

1.3

6.5

ms

Soft-Start Voltage Step

25

mV

ERROR AMPLIFIER

FB Input Resistance

Resistance from FB to GND

180

k

Ω

GNDS Input Bias Current

-5

+5

µA

Output Regulation Voltage

Accuracy

-0.75

+0.75

%