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Part: KA78RH33
Category:
Power Management
-> Regulators
-> Linear Regulators
-> LDO (Low Drop Out)
Description: 0.8A Fixed 3.3V Low Dropout Voltage Regulator (LDO)
Company: Fairchild Semiconductor
Datasheet: Download KA78RH33 datasheet File size : 429 kB
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www.fairchildsemi.com
KA78RH33
Semi Low Dropout Voltage Regulator
Features
· · · · · · · · Fixed Output Voltage of +3.3V Space Saving SMD types of DPAK 1V(Typ) Dropout at Io=800mA Output Current of 800mA Thermal Shutdown Protection Over Current Protection Output trimmed to +/-1% Tolerance No minimum Load Requirement
Description
The KA78RH33 is a +3.3V fixed Low Dropout Voltage Regulator specifically designed for use in low voltage operation. The maximum load current is 0.8A and the dropout voltage is guaranteed to be 1V(Typ). The Dropout Voltage varies with load current. The regulator consists of composite PNP-NPN pass transistors.
D-PAK
1
1. GND 2. Vout 3.Vin
Internal Block Diagram
3.Vin
CURRENT GENERATOR
PROTECTION CIRCUIT
2.Vout
1.GND
Rev. 1.0.1
©2001 Fairchild Semiconductor Corporation
KA78RH33
Absolute Maximum Ratings
Parameter Power Supply Input Voltage Output Load Current Junction Temperature Operating Junction Temperature Storage Temperature Symbol Vin Io Tj T opr Tstg Value 15 800 150 -25 ~ 125 -55 ~ 150 Unit V mA °C °C °C
Temperature Characteristics
Parameter Temperature Coefficient of Output Voltage Symbol Vo/ T Value + / -0.02 Unit % / °C
Electrical Characteristics
(Refer to the test circuit. Vin= 5V, Co=10uF, Ta = 25°C, unless otherwise specified.) Parameter Output Voltage Output Voltage Line Regulation Load Regulation Ripple Rejection Dropout Voltage Quiescent Current Temperature Coefficient of Output Voltage Peak Output Current Output Noise Voltage Symbol Vout Vout Rline Rload RR Vdrop Iq Vo/ T Ipk Vn Conditions Io=10mA, Tj=25°C Vin = 4.8V to 12V Io = 10mA to 800mA Tj = -25°C to 125°C Vin=4.8V to 12V, Io=10mA Io = 10mA to 800mA f=120Hz, Io=500mA Vin = 6.3 +/- 1Vrms Io = 100mA Io = 500mA Io = 800mA Vin <= 12V Tj = -25°C to 125°C Io = 10mA Vin = 6.3V f = 10Hz to 10KHz Min. 3.27 3.23 55 800 Typ. 3.3 3.3 1 1 1 1.05 1.1 5 0 .2 100 Max. 3.33 3.37 10 20 1.2 1.25 1.4 10 Unit V V mV mV dB V mA mV/°C mA µVrms
2
KA78RH33
Typical Application
V in V o ut
KA78RH33
Cin 0 .1uF Gnd Co 1 0 uF
An input capacitor, Cin is not necessary for stability, but it will improve the overall performance
3
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KA-1 KA-2 KA-3 KA-4 KA-5 KA-6 KA-7
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