BD8963EFJ-E2(2010) データシートの表示（PDF） - ROHM Semiconductor

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BD8963EFJ-E2
(Rev.:2010)

Low Noise High-efficiency Switching Regulator with Built-in Power MOSFET

ROHM Semiconductor 

BD8963EFJ

Technical Note

●Description of operations

・Soft-start function

EN terminal shifted to “High” activates a soft-starter to gradually establish the output voltage with the current limited during

startup, by which it is possible to prevent an overshoot of output voltage and an inrush current.

・Shutdown function

With EN terminal shifted to “Low”, the device turns to Standby Mode, and all the function blocks including reference

voltage circuit, internal oscillator and drivers are turned to OFF. Circuit current during standby is 5µF (Typ.).

・UVLO function

Detects whether the input voltage sufficient to secure the output voltage of this IC is supplied. And the hysteresis width of

50mV (Typ.) is provided to prevent output chattering.

Hysteresis 50mV

VCC

EN

VOUT

Standby mode

Tss

Soft start

Operating mode

UVLO

Tss

Tss

Standby

mode

Operating mode

Standby

mode

UVLO

EN

Operating mode

Standby mode

UVLO

Fig.22 Soft start, Shutdown, UVLO timing chart

・Short-current protection circuit with time delay function

Turns OFF the output to protect the IC from breakdown when the incorporated current limiter is activated continuously for

the fixed time(TLATCH) or more. The output thus held tuned OFF may be recovered by restarting EN or by re-unlocking

UVLO.

EN

Output Short circuit

Threshold Voltage

VOUT

IL Limit

IL

Output OFF

latch

Standby

mode

t1<TLATCH

Operating mode

t2=TLATCH

Standby

mode

Operating mode

EN

Timer latch

EN

Fig.23 Short-current protection circuit with time delay timing chart

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2010.06 - Rev.A

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