MAX8533EUB+T【PDF 7/10 页】IC HOT-SWAP CNTRLR 12V 10-UMAX

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Startup Into Load

The MAX8533 is intended to be used in a circuit where

no load is applied until the POK signal is enabled. In an

application where the load is applied during the output-

voltage ramp up, the R

DS(ON)

of the MOSFET is higher

and the power dissipated by the MOSFET is larger.

Repeated, rapid hot-swaps into a load can create suffi-

cient heat to exceed the power-dissipation limits of the

package causing failure of the MOSFET.

Applications Information

Setting the Turn-On Ramp Rate

The MOSFET turn-on ramp rate is determined by the

capacitor (C2) at GATE (Figure 2). An internal 10礎

current source charges C2 to bring GATE high. The

soft-start rate is determined as follows:

= C2 x (V

+ 5)/(10 x 10

-6

)

may be longer than expected in the application

depending on the gate capacitance of the external

MOSFET. The necessary gate voltage is provided by

an on-board charge pump that boosts the voltage at

GATE to (V

+ 5V).

External Power MOSFET Selection

Select the N-channel MOSFET according to the appli-

cations current requirements. Table 2 lists some rec-

ommended components. The MOSFETs on-resistance

DS(ON)

) should be chosen low enough to have a min-

imal voltage drop at full load to limit the MOSFET power

dissipation. High R

DS(ON)

can cause high output ripple

if the board has pulsing loads, or trigger an external

Smallest, Most Reliable, 12V, Infiniband-

Compliant Hot-Swap Controller

_______________________________________________________________________________________ 7

MAX8533

BACKPLANE

10V TO 14V

10m&

3.09k&

20&

31.6k&

4.99k&

100k&

470礔

0.1礔

0.01礔

100礔

10礔

INFINIBAND

MODULE

ISET GATE

OUT

VB_OUT

OVP

POK

RET

VB_RET

CTIM

LPEN

VBxEN

POK

0.22礔

Figure 2. Typical 50W Applications Circuit

MAX8533

REG

CURRENT-REGULATION

CONTROL LOGIC

CHARGE

PUMP

OVERCURRENT

COMPARATOR

OVP

COMPARATOR

POK

COMPARATOR

SEVERE

OVERCURRENT

COMPARATOR

UVLO

COMPARATOR

CURRENT-

REGULATION

TIMER

RET

LPEN

POK

OUT

CTIM

20礎

7.5k&

I0礎

20礎

CLAMP

BIAS

REFERENCE

(REF)

5V LINEAR

REGULATOR

GATE

SET

OVP

Figure 1. MAX8533 Functional Diagram

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