Table 5. output voltage vs. dac codes – Rainbow Electronics MAX1855 User Manual
Page 20
MAX1716/MAX1854/MAX1855
High-Speed, Adjustable, Synchronous Step-Down
Controllers with Integrated Voltage Positioning
20
______________________________________________________________________________________
Undervoltage Lockout and Soft-Start
V
CC
undervoltage lockout (UVLO) circuitry inhibits
switching, forces VGATE low, and drives the DL output
high. If the V
CC
voltage drops below 4.2V, it is
assumed that there is not enough supply voltage to
make valid decisions. To protect the output from over-
voltage faults, DL is forced high in this mode. This will
force the output to GND and results in large negative
inductor current that pulls the output below GND. If V
CC
is likely to drop in this fashion, the output can be
OUTPUT VOLTAGE
D4
D3
D2
D1
D0
MAX1716
MAX1854
MAX1855
0
0
0
0
0
No CPU*
2.000V
1.750V
0
0
0
0
1
No CPU*
1.950V
1.700V
0
0
0
1
0
No CPU*
1.900V
1.650V
0
0
0
1
1
No CPU*
1.850V
1.600V
0
0
1
0
0
No CPU*
1.800V
1.550V
0
0
1
0
1
No CPU*
1.750V
1.500V
0
0
1
1
0
No CPU*
1.700V
1.450V
0
0
1
1
1
No CPU*
1.650V
1.400V
0
1
0
0
0
1.600V
1.600V
1.350V
0
1
0
0
1
1.550V
1.550V
1.300V
0
1
0
1
0
1.500V
1.500V
1.250V
0
1
0
1
1
1.450V
1.450V
1.200V
0
1
1
0
0
1.400V
1.400V
1.150V
0
1
1
0
1
1.350V
1.350V
1.100V
0
1
1
1
0
1.300V
1.300V
1.050V
0
1
1
1
1
No CPU*
No CPU*
1.000V
1
0
0
0
0
1.275V
1.275V
0.975V
1
0
0
0
1
1.250V
1.250V
0.950V
1
0
0
1
0
1.225V
1.225V
0.925V
1
0
0
1
1
1.200V
1.200V
0.900V
1
0
1
0
0
1.175V
1.175V
0.875V
1
0
1
0
1
1.150V
1.150V
0.850V
1
0
1
1
0
1.125V
1.125V
0.825V
1
0
1
1
1
1.100V
1.100V
0.800V
1
1
0
0
0
1.075V
1.075V
0.775V
1
1
0
0
1
1.050V
1.050V
0.750V
1
1
0
1
0
1.025V
1.025V
0.725V
1
1
0
1
1
1.000V
1.000V
0.700V
1
1
1
0
0
0.975V
0.975V
0.675V
1
1
1
0
1
0.950V
0.950V
0.650V
1
1
1
1
0
0.925V
0.925V
0.625V
1
1
1
1
1
No CPU*
No CPU*
0.600V
*Note: In the no-CPU state, DH and DL are held low.
Table 5. Output Voltage vs. DAC Codes