MAX5963UTL+T【PDF 9/20 页】IC HOT SWAP DIO ORING CTL 40TQFN

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Sheet目录43

5页 6页 7页 8页 [9页]10页 11页 12页 13页

Dual, 7.5V to 76V, Hot-Swap and

Diode ORing Controller

_______________________________________________________________________________________ 9

Pin Description

NAME

FUNCTION

PWR

System Power Input. Connect to the system power source. The MAX5963 draws less than 10礎 of

current from this input when GATEPS is off. Bypass PWR to GND with a 0.1礔 ceramic capacitor.

2, 4, 6, 10, 11,

14, 16, 21, 25,

30, 39, 40

N.C.

No Connection. Not internally connected.

GATEOR

ORing MOSFET Gate-Drive Output. Referenced to PWR. GATEOR is a charge pump with a 50礎

pullup current to 5.5V (typ) above V

PWR

when active.

GATEPS

System Power MOSFET Gate-Drive Output. Referenced to PS. GATEPS is a charge pump with a

50礎 pullup current to 5.5V (typ) above V

when active.

GATE2A

Channel A Current-Limiter Switch Gate-Drive Output 2. Referenced to OUTA. Connect GATE2A to

the gate of the second n-channel MOSFET (see the Typical Operating Circuit). GATE2A is a charge

pump with a 50礎 pullup current to 5.5V (typ) above OUTA when active. GATE2A is identical to, but

independent of, GATE1A.

OUTA

Channel A Output-Voltage Sense. Connect to the output.

GATE1A

Channel A Current-Limiter Switch Gate-Drive Output 1. Referenced to OUTA. Connect GATE1A to

the gate of the first n-channel MOSFET (see the Typical Operating Circuit). GATE1A is a charge

pump with a 50礎 pullup current to 5.5V (typ) above OUTA when active. GATE1A is identical to, but

independent of, GATE2A.

SENSEA

Channel A Current-Sense Negative Input. Connect the negative voltage-sensing terminal of a

current-sense resistor, R

SENSEA

, to SENSEA. Connect the positive voltage-sensing terminal of

SENSEA

to PS.

Output of Diode OR Connection between PWR and PS. Bypass BP to GND with a 1礔 capacitor.

Power Priority Input. Connect to the source of the external QPS FET. The MAX5963 draws most of its

power from PS whenever possible. Bypass PS to GND with a 0.1礔 ceramic capacitor. Ensure that

the bypass capacitance on PS is less than or equal to the bypass capacitance on PWR.

Circuit-Breaker Threshold Programming Input. Connect a resistor from PS to CB to program the

circuit-breaker threshold. A capacitor connected from CB to PS is recommended for impedance

matching.

Current-Limit Threshold Programming Input. Connect a resistor from PS to CL to program the

current-limit threshold. A capacitor connected from CL to PS is recommended for impedance

matching.

ORing Threshold Programming Input. Connect a resistor from PS to OR to program the ORing

current threshold. A capacitor connected from OR to PS is recommended for impedance matching.

SENSEB

Channel B Current-Sense Negative Input. Connect the negative voltage-sensing terminal of a

current-sense resistor, R

SENSEB

, to SENSEB. Connect the positive voltage-sensing terminal of

SENSEB

to PS.

GATE1B

Channel B Current-Limiter Switch Gate-Drive Output 1. Referenced to OUTB. Connect GATE1B to

the gate of the 1st n-channel MOSFET (see the Typical Operating Circuit). GATE1B is a charge

pump with a 50礎 pullup current to 5.5V (typ) above OUTB when active. GATE1B is identical to, but

independent of, GATE2B.

OUTB

Channel B Output-Voltage Sense. Connect to the output.

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