BD6520F(2008) 查看數據表（PDF） - ROHM Semiconductor

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BD6520F
(Rev.:2008)

Large Current Output Power Management Switch ICs

ROHM Semiconductor 

●I/O circuit

Symbol

SSCTL

Pin No.

3

Equivalent circuit

BD6520F

SSCTL

Equivalent circuit

BD6522F

SSCTL

CTRL

CTRL

4

DISC

6

(BD6522F)

CTRL

D IS C

6 (BD6520F),

OUT

OUT

OUT

7, 8

Fig.60 I/O circuit

●Functional description

1. Switch operation

VDD pin and OUT pin are connected to the drain and the source of switch MOSFET respectively. And the VDD is used also

as power source input to internal control circuit.

When CTRL input is set to High level and the switch is turned on, VDD and OUT is connected by a 50mΩ switch. In a normal

condition, current flows from VDD to OUT. If voltage of OUT is higher than VDD, current flows from OUT to VDD, since the

switch is bidirectional.

In BD6520F, there is a parasitic diode between the drain and the source of switch MOSFET. Therefore, even when the switch

is off, if the voltage of OUT is higher than that of VDD, current flows from OUT to VDD. In BD6522F, there is not this parasitic

diode, it is possible to prevent current from flowing reversely from OUT to VDD.

2. Thermal shutdown

Thermal shut down circuit turns off the switch when the junction temperature exceeds 135℃(Typ.).

The switch off status of the thermal shut down is latched. Therefore, even when the junction temperature goes down, switch

off is maintained. To release the latch, it is necessary to input a signal to switch off to CTRL terminal or make UVLO status.

When the switch on signal is input or UVLO is released, the switch output is recovered.

The thermal shut down circuit works when CTRL signal is active.

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