Rainbow-electronics MAX1855 Manual do Utilizador descarregar pdf (Página 20)

MAX1716/MAX1854/MAX1855

High-Speed, Adjustable, Synchronous Step-Down

Controllers with Integrated Voltage Positioning

20 ______________________________________________________________________________________

Undervoltage Lockout and Soft-Start

undervoltage lockout (UVLO) circuitry inhibits

switching, forces VGATE low, and drives the DL output

high. If the V

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

is likely to drop in this fashion, the output can be

OUTPUT VOLTAGE

D4 D3 D2 D1 D0

MAX1716 MAX1854 MAX1855

00000 No CPU* 2.000V 1.750V

00001 No CPU* 1.950V 1.700V

00010 No CPU* 1.900V 1.650V

00011 No CPU* 1.850V 1.600V

00100 No CPU* 1.800V 1.550V

00101 No CPU* 1.750V 1.500V

00110 No CPU* 1.700V 1.450V

00111 No CPU* 1.650V 1.400V

01000 1.600V 1.600V 1.350V

01001 1.550V 1.550V 1.300V

01010 1.500V 1.500V 1.250V

01011 1.450V 1.450V 1.200V

01100 1.400V 1.400V 1.150V

01101 1.350V 1.350V 1.100V

01110 1.300V 1.300V 1.050V

01111 No CPU* No CPU* 1.000V

10000 1.275V 1.275V 0.975V

10001 1.250V 1.250V 0.950V

10010 1.225V 1.225V 0.925V

10011 1.200V 1.200V 0.900V

10100 1.175V 1.175V 0.875V

10101 1.150V 1.150V 0.850V

10110 1.125V 1.125V 0.825V

10111 1.100V 1.100V 0.800V

11000 1.075V 1.075V 0.775V

11001 1.050V 1.050V 0.750V

11010 1.025V 1.025V 0.725V

11011 1.000V 1.000V 0.700V

11100 0.975V 0.975V 0.675V

11101 0.950V 0.950V 0.650V

11110 0.925V 0.925V 0.625V

11111 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

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 32 33

MAX1716/MAX1854/MAX1855 1

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