Rainbow-electronics MAX1510 Manual de usuario descargar pdf (Pagina 10)

MAX1510

Low-Voltage DDR Linear Regulator

10 ______________________________________________________________________________________

Power-Good (PGOOD)

The MAX1510 provides an open-drain PGOOD output

that goes high 2ms (typ) after the output initially reach-

es regulation during startup. PGOOD transitions low

10µs after the output goes out of regulation by ±150mV,

or when the device enters shutdown. Connect a pullup

resistor from PGOOD to V

for a logic-level output.

Use a 100kΩ resistor to minimize current consumption.

Applications Information

Dynamic Output-Voltage Transitions

By changing the voltage at REFIN, the MAX1510 can

be used in applications that require dynamic output-

voltage changes between two set points (graphics

processors). Figure 4 shows a dynamically adjustable

resistive voltage-divider network at REFIN. Using an

external signal MOSFET, a resistor can be switched in

and out of the REFIN resistor-divider, changing the volt-

age at REFIN. The two output voltages are determined

by the following equations:

RRR

OUT LOW REF

OUT HIGH REF

()













()













123

MAX1510

REFIN

REFERENCE

VOLTAGE

REF

)

OUT(HIGH)

(R2 + R3)

R1 + (R2 + R3)

OUT(LOW)

OUT(HIGH)

R1 + R2

OUT(LOW)

REF

(

)

Figure 4. Dynamic Output-Voltage Change

Figure 3. MAX1510 PGOOD and Soft-Start Waveforms

POWER-GOOD

WINDOW

CURRENT LIMIT

OUT

PGOOD

10µs

PROPAGATION

DELAY

2ms STARTUP

DELAY

10µs

PROPAGATION

DELAY

200µs

OUTPUT OVERLOAD

CONDITION

SHDN

1 2 ... 5 6 7 8 9 10 11 12 13

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