LTC1699 View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LTC1699 Datasheet PDF : 20 Pages
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LTC1699 Series
APPLICATIO S I FOR ATIO
In general, adjustable DC/DC Converters regulate the
output voltage by dividing it down with a resistor divider
and comparing the result against a precision reference
voltage (VREF). As shown in the Block Diagram, the
LTC1699-80, LTC1699-81 and LTC1699-82 are variable
resistor dividers, which are programmed through a 2-wire
SMBus interface. They are specifically designed to sim-
plify the implementation of a voltage regulator module
(VRM) in both portable and desktop computers.
Two 5-bit divider settings can be programmed into Regis-
ter 0 and Register 1 using the SMBus interface. The
microprocessor selects one of these settings using the
TTL compatible SEL pin to control a 10:5 multiplexer
(MUX). The precision ±0.35% divider is intended to set the
10
Table 1. DC/DC Converter Output Voltage for VREF = 0.8V
VID4 VID3 VID2 VID1 VID0 LTC1699-80 LTC1699-81
0
0
0
0
0
2.000V
2.05V
0
0
0
0
1
1.950V
2.00V
0
0
0
1
0
1.900V
1.95V
0
0
0
1
1
1.850V
1.90V
0
0
1
0
0
1.800V
1.85V
0
0
1
0
1
1.750V
1.80V
0
0
1
1
0
1.700V
1.75V
0
0
1
1
1
1.650V
1.70V
0
1
0
0
0
1.600V
1.65V
0
1
0
0
1
1.550V
1.60V
0
1
0
1
0
1.500V
1.55V
0
1
0
1
1
1.450V
1.50V
0
1
1
0
0
1.400V
1.45V
0
1
1
0
1
1.350V
1.40V
0
1
1
1
0
1.300V
1.35V
0
1
1
1
1
1.250V
1.30V
1
0
0
0
0
1.275V
3.50V
1
0
0
0
1
1.250V
3.40V
1
0
0
1
0
1.225V
3.30V
1
0
0
1
1
1.200V
3.20V
1
0
1
0
0
1.175V
3.10V
1
0
1
0
1
1.150V
3.00V
1
0
1
1
0
1.125V
2.90V
1
0
1
1
1
1.100V
2.80V
1
1
0
0
0
1.075V
2.70V
1
1
0
0
1
1.050V
2.60V
1
1
0
1
0
1.025V
2.50V
1
1
0
1
1
1.000V
2.40V
1
1
1
0
0
0.975V
2.30V
1
1
1
0
1
0.950V
2.20V
1
1
1
1
0
0.925V
2.10V
1
1
1
1
1
0.900V
2.00V
LTC1699-82
1.850V
1.825V
1.800V
1.775V
1.750V
1.725V
1.700V
1.675V
1.650V
1.625V
1.600V
1.575V
1.550V
1.525V
1.500V
1.475V
1.450V
1.425V
1.400V
1.375V
1.350V
1.325V
1.300V
1.275V
1.250V
1.225V
1.200V
1.175V
1.150V
1.125V
1.100V
1.075V
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