NCP565MN33T2G(2007) View Datasheet(PDF) - ON Semiconductor

Part Name

Description

Manufacturer

NCP565MN33T2G
(Rev.:2007)

1.5 A Low Dropout Linear Regulator

ON Semiconductor 

NCP565/NCV565

Protection Diodes

When large external capacitors are used with a linear

regulator it is sometimes necessary to add protection diodes.

If the input voltage of the regulator gets shorted, the output

capacitor will discharge into the output of the regulator. The

discharge current depends on the value of the capacitor, the

output voltage and the rate at which Vin drops. In the

NCP565 linear regulator, the discharge path is through a

large junction and protection diodes are not usually needed.

If the regulator is used with large values of output

capacitance and the input voltage is instantaneously shorted

to ground, damage can occur. In this case, a diode connected

as shown in Figure 23 is recommended.

1N4002 (Optional)

Vin

Vin

Vout

Vout

NCP565

CAdj

C1 GND Adj

C2

R1

R2

Figure 23. Protection Diode for Large

Output Capacitors

Thermal Considerations

This series contains an internal thermal limiting circuit

that is designed to protect the regulator in the event that the

maximum junction temperature is exceeded. This feature

provides protection from a catastrophic device failure due to

accidental overheating. It is not intended to be used as a

substitute for proper heat sinking. The maximum device

power dissipation can be calculated by:

PD

+

TJ(max) *

RqJA

TA

200

180

160

140

120

100

80

60

40

0

DFN 1 oz Cu

DFN 2 oz Cu

SOT−223 1 oz Cu

SOT−223 2 oz Cu

D2PAK 1 oz Cu

D2PAK 2 oz Cu

50 100 150 200 250 300 350 400 450 500

COPPER HEAT−SPREADER AREA (mm sq)

Figure 24. Thermal Resistance

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