BD1484EFJ datasheet(11/20 Pages) ROHM

Part #	BD1484EFJ

Description	Low Standby Current during Shutdown Mode

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Manufacturer	ROHM [Rohm]

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TSZ02201-0333AD100140-1-2

11/17

06.Aug.2012 Rev.001

TSZ22111･15･001

BD1484EFJ

Datasheet

Soft Start Function

An adjustable soft-start function to prevent high inrush current

during start-up is available.

The soft-start time is set by the external capacitor connected to

SS pin.

The soft start time is given by;

TSS [s] = 2.2 x Css /

ISS

Setting CSS= 0.1µF;

TSS= 2.2 x 0.1µ / 10µ = 22 [ms]

Please confirm the overshoot of the output voltage and inrush

current when deciding the SS capacitor value.

EN Function

The EN terminal control IC’s shut down.

Leaving EN terminal open makes IC shutdown.

To start the IC, EN terminal should be connected to VIN or the

other power source output.

When the EN voltage exceed 1.2V (typ.), the IC start operating.

The IC also has the hysteresis voltage 0.2V (typ.) of EN when

EN voltage falls down.

(Attention1)

Chattering happens if standing lowering speed is slow when

standing of EN pin is lowered.

The reverse current in which the input side and the pressure

operation are done from the output side is generated when

chattering operates with the output voltage remained, and

there is a case to destruction.

Please set to stand within 100us when you control ON/OFF by

the EN signal.

This necessity doesn't exist when EN pin is connected with

VIN and EN is not controlled.

The control by open drain MOSFET shown in a left chart is

recommended.

(Attention 2)

In case the output voltage is used in a setting of more than 5V,

when EN signal is turned off, please start up EN again after

output voltage is discharged enough.

If EN is turned on although output voltage isn’t discharged

enough, BST circuit doesn’t operate normally.

As the result, the IC is not operated, in the worst case, it is

destroyed.

REN

ON/OFF

Signal

EN

VIN

EN

124 k

Ω(typ.)

254 k

Ω(typ.)

CSS

SS

+

-

COMP

ISS 10µA

ERRAMP

↓

Fig.24

Fig.25

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