BD3941FP データシートの表示（PDF） - ROHM Semiconductor

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BD3941FP

Power Management LSI Series for Automotive Body Control

ROHM Semiconductor 

9) Applications or inspection processes with modes where the potentials of the Vcc pin and other pins may be reversed from their normal

states may cause damage to the IC's internal circuitry or elements.

Use an output pin capacitance of 1,000 µF or lower in case Vcc is shorted with the GND pin while the external capacitor is charged. It is

recommended to insert a diode for preventing back current flow in series with Vcc or bypass diodes between Vcc and each pin.

Diode for preventing back current flow

Bypass diode

Vcc

Pin

Fig. 23

10) Thermal shutdown circuit (TSD)

This IC incorporates a built-in thermal shutdown circuit for the protection from thermal destruction. The IC should be used within the

specified power dissipation range. However, in the event that the IC continues to be operated in excess of its power dissipation limits, the

attendant rise in the chip’s temperature Tj will trigger the thermal shutdown circuit to turn off all output power elements. The circuit will

automatically reset once the chip’s temperature Tj drops. Operation of the thermal shutdown circuit presumes that the IC’s absolute

maximum ratings have been exceeded. Application designs should never make use of the thermal shutdown circuit. (See Fig.8)

11) Overcurrent protection circuit (OCP)

The IC incorporates a built-in overcurrent protection circuit that operates according to the output current capacity. This circuit serves to

protect the IC from damage when the load is shorted. The protection circuit is designed to limit current flow by not latching in the event of

a large and instantaneous current flow originating from a large capacitor or other component. However, while this protection circuit is

effective in preventing damage due to sudden and unexpected accidents, it is not compatible with continuous operation or use during

transitional periods. At the time of thermal designing, keep in mind that the current capability has negative characteristics to temperatures.

(See Fig. 3.)

12) Overvoltage protection circuit (OVP)

Overvoltage protection is designed to turn off all output when the voltage differential between the VCC and GND pins exceeds

approximately 30 V (typ.). Use caution when determining the power supply voltage range to use. (See Fig. 6)

zSelecting a model name when ordering

BD

ROHM model

name

3941

Part number

3940: 3.3 V output

3941: 5.0 V output

FP

Packaging type

FP : TO252-3

HFP : HRP5

T : TO220FP-3

E2

Taping

E2 : Reel-wound embossed taping

TO252-3

<Dimension>

6.5±0.2

5.1+−00..21

FIN

C0.5

2.3±0.2

0.5±0.1

<Tape and Reel information>

Tape

Quantity

Embossed carrier tape

2000pcs

Direction

of feed

E2

(The direction is the 1pin of product is at the lower left when you hold

reel on the left hand and you pull out the tape on the right hand)

1

2

3

0.65

0.65

0.75

2.3±0.2 2.3±0.2

0.5±0.1

1.0±0.2

(Unit:mm)

xxxx

x x xx

xxxx

xxxx

x x xx

xxxx

Reel

1pin Direction of feed

※When you order , please order in times the amount of package quantity.

7/8

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