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LTC1553CG

5-Bit Programmable Synchronous Switching Regulator Controller for Pentium® II Processor

Linear Technology 

FU CTIO TABLES

Table 1. OT Logic

OUTEN (V)

<2

>2

Table 2. PWRGD and FAULT Logic

INPUT

OUTEN

VSENSE**

OT

0

X

0

1

< 95%

1

1

> 95%

1

< 105%

1

>105%

1

1

> 115%

1

OT*

0

1

OUTPUT*

FAULT

1

1

1

PWRGD

0

0

1

1

0

0

0

Table 3. Rated Output Voltage

INPUT PIN

RATED OUTPUT

VID4

VID3

VID2

VID1

VID0

VOLTAGE (V)

0

1

1

1

1

Disabled † (1.30)

0

1

1

1

0

Disabled † (1.35)

0

1

1

0

1

Disabled † (1.40)

0

1

1

0

0

Disabled † (1.45)

0

1

0

1

1

Disabled † (1.50)

0

1

0

1

0

Disabled † (1.55)

0

1

0

0

1

Disabled † (1.60)

0

1

0

0

0

Disabled † (1.65)

0

0

1

1

1

Disabled † (1.70)

0

0

1

1

0

Disabled † (1.75)

LTC1553

Table 3. Rated Output Voltage (cont)

INPUT PIN

RATED OUTPUT

VID4

VID3

VID2

VID1

VID0

VOLTAGE (V)

0

0

1

0

1

1.80

0

0

1

0

0

1.85

0

0

0

1

1

1.90

0

0

0

1

0

1.95

0

0

0

0

1

2.00

0

0

0

0

0

2.05

1

1

1

1

1

SHDN

1

1

1

1

0

2.1

1

1

1

0

1

2.2

1

1

1

0

0

2.3

1

1

0

1

1

2.4

1

1

0

1

0

2.5

1

1

0

0

1

2.6

1

1

0

0

0

2.7

1

0

1

1

1

2.8

1

0

1

1

0

2.9

1

0

1

0

1

3.0

1

0

1

0

0

3.1

1

0

0

1

1

3.2

1

0

0

1

0

3.3

1

0

0

0

1

3.4

1

0

0

0

0

3.5

* With external pull-up resistor

** With respect to the output voltage selected in Table 3 as required by

Intel Specification VRM 8.2

† These code selections are disabled in LTC1553

X Don’t care

9

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