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LM317

3-terminal posifive adjustable regulator

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LM317
3-terminal posifive adjustable regulator
Features
· · · · · · Output Current In Excess of 1. 5A Output Adjustable Between 1. 2V and 37V Internal Thermal-Overload Protection Internal Short-Circuit Current-Limiting Output Transistor Sate-Area Compensation TO-220 Package
Description
This monolithic integrated circuit is an adjustable 3-terminal positive voltage regulator designed to supply more than 1.5A of load current with an output voltage adjustable over a 1.2 to 37V. It employs internal current limiting, thermal shutdown and safe area compensation.
TO-220
1. Adj 2. Output 3. Input
Internal Block Diagram
Vin Input 3
Voltage Reference
Protection Circuitry
Rlimit
Output
1 Vadj
Rev. 5.0
LM317
Absolute Maximum Ratings
Electrical Characteristics
Load Regulation
Rload
IADJ IADJ
VREF STT L(MIN) IO(MAX) eN RR ST RJC
LM317
Typical Perfomance Characteristics
TEMPERA TURE (°C)
ADJUSTMENT CURRENT(uA)
TEMPERA TURE (°C)
Figure 1. Load Regulation
Figure 2. Adjustment Current
INPUT-OUTPUT DIFFERENTIAL(V)
REFERENCE VOLTAGE(V)
TEMPERA TURE (°C)
Figure 3. Dropout Voltage
Figure 4. Reference Voltage
LM317
Typical Application
VI Input Ci 0. 1µF µ
KA317
Output
Figure 5. Programmable Regulator
Ci is required when regulator is located an appreciable distance from power supply filter. Co is not needed for stability, however, it does improve transient response. Since IADJ is controlled to less than 100µA, the error associated with this term is negligible in most applications.
LM317
Mechanical Dimensions
Package
TO-220
18.95MAX.
LM317
Ordering Information
Product Number LM317T Package TO-220 Operating Temperature 0°C to + 125°C
LM317
www.fairchildsemi.com 7 / 13 / 00 0.0m 001 Stock#DSxxxxxxxx 2000 Fairchild Semiconductor International
2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.