User Manual

MAX1813
Dynamically-Adjustable, Synchronous Step-Down
Controller with Integrated Voltage Positioning
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3.3V
100kΩ
100kΩ
100kΩ
100kΩ
100kΩ
100kΩ
VID4
VID3
VID2
VID1
VID0
1nF
GMUXSEL
SMBUS
ADDRESS
SMBUS
DATA
CLOCK
ADD0
ADD1
0
1
0
1
0
1
1
1
1
1
3.3kΩ
ZMODE
CPU
MAX1813
3.3V
MAX1609
100kΩ 100kΩ
100kΩ 100kΩ
MAX1813
D4
D3
D2
D1
D0
ZMODE
*TO REDUCE QUIESCENT CURRENT, 1kΩ PULLUP RESISTORS CAN BE REPLACED BY 1MΩ RESISTORS WITH 4.7nF CAPACATORS IN PARALLEL.
ZMODE HIGH
VID = 01010 → 1.25V
CPU VID =
01100 → 1.15V
(ZMODE LOW)
1kΩ
1MΩ
1kΩ 1kΩ 1kΩ 1kΩ
4.7nF
*OPTIONAL
3.15V TO 5.5V
100kΩ
100kΩ
CPU
ZMODE = HIGH = 1.25V
ZMODE = LOW = 1.15V
Figure 14. Using the Internal Mux with CPU Driving the Logic-Mode CID Code
Figure 15. Using the ZMODE Multiplexer