Fairchild Semiconductor KA78RM33T Datasheet
LOW DROPOUT VOLTAGE REGULATOR KA78RM33
1
LOW DROPOUT VOLTAGE REGULATOR
The KA78RM33 is a low-dropout voltage regulator suitable for
various electronic equipment. It provide constant voltage
power source with surface mount type package (D-PAK).
Dropout voltage of KA78RM33 is below 0.6V in full rated
current (0.5A).This regulator has various function such as
peak current protection, thermal shut down and SOA (Safe
Operating Area) protection.
FEATURES
• 0.5A / 3.3V Output low dropout voltage regulator
• Low dropout voltage (Max. 0.6V)
• Peak current protection, Thermal shutdown
• SOA protection, Short circuit protection
BLOCK DIAGRAM
TO-220
D-PAK
1. Vin
2. GND
3. Vout
ORDERING INFORMATION
Device Package Operating Temperature
KA78RM33R D-PAK
−25 ~ + 125°C
KA78RM33T TO-220
3
1Vin
3
Vout
GND
Q1
R1
R2
Current
Generator
Thermal
Shutdown
Protection
SOA
Protection
Short Circuit
Protection
Bandgap
Reference
Error
Amp.
Output
Drive
3
11Vin
3
Vout3Vout
GND
Q1
R1
R2
Current
Generator
Current
Generator
Thermal
Shutdown
Protection
Thermal
Shutdown
Protection
SOA
Protection
Short Circuit
Protection
Short Circuit
Protection
Bandgap
Reference
Bandgap
Reference
Error
Amp.
Output
Drive
KA78RM33 LOW DROPOUT VOLTAGE REGULATOR
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ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VIN = 5V, IO = 0.25A, Ta = 25°C, unless otherwise specified)
NOTE:
This parameter, although guaranteed, is not 100% tested in production.
Characteristic Symbol Value Unit
Input Voltage V
IN
20 V
Output Current I
O
0.5 A
Power Dissipation Pd Internally limited Junction Temperature Tj +150 °C
Operating Temperature Topr −25 ~ +125 °C
Characteristic Symbol Test Conditions Min. Typ. Max. Unit
Output Voltage Vout I
O
= 0mA 3.22 3.3 3.38 V
Load Regulation Rload 5mA < I
O
< 0.5A − 233mV
Line Regulation Rline
4.3V < Vin < 16V
I
O
= 10mA
− 220mV
Ripple rejection Ratio RR f = 120Hz, V
IN
= 5 ± 0.5Vrns 55 −−dB
Dropout Voltage Vdrop I
O
= 0.5A −−0.6 V
Quiescent Current I
Q
Vin = 5V, IO = 0mA − 510mA
Peak Output Current I
PK
Vin = 5V 0.7 1 1.7 A
Output Noise Voltage
note
V
N
10Hz < f < 100KHz − 50 −µVrms
Temperature Coefficient of Output
Voltage
∆Vout/
∆T
−25°C < Tj < 125°C
I
O
= 10mA
−−0.2 − mV/°C
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