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LM317 3-Terminal Positive Adjustable Regulator
March 2000 Revised June 2005
LM317 3-Terminal Positive Adjustable Regulator
This monolithic integrated circuit adjustable 3-terminal positive voltage regulator designed supply more than 1.5A load current with output voltage adjustable over 37V. employs internal current limiting, thermal shut-down safe area compensation.
Features
Output Current Excess 1.5A Output Adjustable Between 1.2V Internal Thermal Overload Protection Internal Short Circuit Current Limiting Output Transistor Safe Operating Area Compensation TO-220 Package Package
Ordering Code:
Product Number LM317T LM317D2TXM Package TO-220 Operating Temperature 125qC 125qC
Connection Diagrams
Internal Block Diagram
2005 Fairchild Semiconductor Corporation
DS400281
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LM317
Absolute Maximum Ratings
Parameter Input-Output Voltage Differential Lead Temperature Power Dissipation Operating Junction Temperature Range Storage Temperature Range Temperature Coefficient Output Voltage Symbol TLEAD TSTG Value Internally limited Unit
'VO/'T
r0.02
Note Absolute Maximum Ratings: those values beyond which safety device cannot guaranteed. device should operated these limits. parametric values defined Electrical Characteristics tables guaranteed absolute maximum ratings. "Recommended Operating Conditions" table will define conditions actual device operation.
Electrical Characteristic
0.5A, 125qC, IMAX
Symbol Rline
1.5A, PDMAX
25qC
20W, unless otherwise specified)
Conditions 0.01 0.02 18.0 40.0 46.0 0.04 0.07 25.0 70.0 Unit
Parameter Line Regulation (Note
Load Regulation (Note Rload
25qc, 10mA IMAX
10mA IMAX Adjustable Current Adjustable Current Change Reference Voltage IADJ
'IADJ
VREF
10mA IMAX PMAX 10mA IMAX PMAX
1.20
1.25
1.30 12.0 0.01
Temperature Stability Minimum Load Current Maintain Regulation Maximum Output Current
IL(MIN) IO(MAX)
15V, PMAX 40V, PMAX 25qC
Noise,% VOUT Ripple Rejection Long-Term Stability, THIGH
RTJC
CADJ
25qC, 10Hz 10KHz
10V, 120Hz without CADJ 10PF (Note
66.0
0.003 60.0 75.0
25qC point measurements, 1000HR
Thermal Resistance Junction Case
Note Load line regulation specified constant junction temperature. Change heating effects must taken into account separately. Pulse testing with duty used. (PMAX 20S) Note CADJ, when used, connected between adjustment ground.
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LM317
Typical Performance Characteristics
FIGURE Load Regulation
FIGURE Adjustment Current
FIGURE Dropout Voltage
FIGURE Reference Voltage
Typical Application
Note: required when regulator located appreciable distance from power supply filter. Note: needed stability, however, does improve transient response. Note: Since IADJ controlled less than 100PA, error associated with this term negligible most applications.
FIGURE Programmable Regulator
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LM317
Physical Dimensions inches (millimeters) unless otherwise noted
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LM317 3-Terminal Positive Adjustable Regulator
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
Fairchild does assume responsibility circuitry described, circuit patent licenses implied Fairchild reserves right time without notice change said circuitry specifications. LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS AUTHORIZED CRITICAL COMPONENTS LIFE SUPPORT DEVICES SYSTEMS WITHOUT EXPRESS WRITTEN APPROVAL PRESIDENT FAIRCHILD SEMICONDUCTOR CORPORATION. used herein: Life support devices systems devices systems which, intended surgical implant into body, support sustain life, whose failure perform when properly used accordance with instructions provided labeling, reasonably expected result significant injury user. critical component component life support device system whose failure perform reasonably expected cause failure life support device system, affect safety effectiveness. www.fairchildsemi.com
www.fairchildsemi.com
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