Rainbow Electronics MAX1813 User Manual
Page 31
MAX1813
Dynamically-Adjustable, Synchronous Step-Down
Controller with Integrated Voltage Positioning
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31
MAX1813
D4
D3
D2
D1
D0
ZMODE
3.0V TO 5.5V
ZMODE HIGH
VID = 01010
1.25V
ZMODE LOW
VID = 01100
1.15V
100k
Ω
100k
Ω
ZMODE = HIGH = 1.25V
ZMODE = LOW = 1.15V
Figure 12. Using the Internal Mux with Hard-Wired Logic-Mode
and Impedance-Mode DAC Codes
MAX1813
D4
D3
D2
D1
D0
ZMODE
ZMODE = HIGH = 1.25V
ZMODE = LOW = 1.15V
1k
Ω
1k
Ω
100k
Ω
1k
Ω
100k
Ω
2.7V TO 5.5V
NOTE: USE PULLUP FOR LOGIC MODE 1, PULLDOWN FOR LOGIC MODE 0.
USE
≥100kΩ FOR IMPEDANCE MODE 1, ≤1kΩ FOR IMPEDANCE MODE 0.
Figure 13. Using the Internal Mux with Both VID Codes
Resistor-Programmed
Figure 11. Three-State Operating Mode Control
SKP/SDN
INV1
R1
120k
Ω
SUS
V
CC
INV2
INV3
R2
80k
Ω
R3
30k
Ω
C1
10nF
ON/OFF
SUSPEND
SUSPEND
SKIP
(2.8V TO 6V)
MAX1813
OPERATING
MODE
FORCED-PWM
(1.4V TO 2.2V)
SHUTDOWN
(0 TO 0.5V)
t
DELAY
t
DELAY
MAX1813
ON/OFF