KA278R05 데이터 시트보기 (PDF) - Fairchild Semiconductor

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KA278R05

2 A Output Low Dropout Voltage Regulators

Fairchild Semiconductor 

Block Diagram

Vin 1

THERMAL SHUTDOWN

BANDGAP REFERENCE

HIGH / LOW

Vdis 4

-

+

OUTPUT

ON / OFF

1.4V

OVERVOLTAGE

PROTECTION

-

+

SOA PROTECTION

Q1

R1

R2

SHORTCIRCUIT

PROTECTION

2 Vo

3

GND

Figure 1. KA278R33 / 05 / 12C

Vin 1

THERMAL SHUTDOWN

BANDGAP REFERENCE

OVERVOLTAGE

PROTECTION

-

+

SOA PROTECTION

SHORTCIRCUIT

PROTECTION

Q1

2 Vo

Rin

4 Vadj

Rref

3

GND

Figure 2. KA278RA05C

Absolute Maximum Ratings

Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be opera-

ble above the recommended operating conditions and stressing the parts to these levels is not recommended. In addi-

tion, extended exposure to stresses above the recommended operating conditions may affect device reliability. The

absolute maximum ratings are stress ratings only. Values are at TA = 25°C unless otherwise noted.

Symbol

Parameter

VIN

Input Voltage

Vdis

Disable Voltage

KA278RXXC

IO

Output Current

PD1

Power Dissipation 1

No Heat-Sink

PD2

Power Dissipation 2

With Heat-Sink

Tj

Junction Temperature

Topr

Operating Temperature

Rθjc

Thermal Resistance, Junction-to Case(1)

Rθja

Thermal Resistance, Junction-to-Air

Note:

1. Junction-to-case thermal resistance test environments:

- Pneumatic heat sink fixture;

- Clamping pressure 60 psi through 12 mm diameter cylinder;

- Thermal grease applied between PKG and heat sink fixture.

Value

35

35

2.0

1.5

15

150

-20 to 80

2.9

48.51

Unit

V

V

A

W

W

°C

°C

°C/W

°C/W

© 2004 Fairchild Semiconductor Corporation

KA278RXXC-Series Rev. 1.1.0

2

www.fairchildsemi.com

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