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LM317 3-Terminal Positive Adjustable Regulator

March 2000 Revised June 2005

LM317 3-Terminal Positive Adjustable Regulator
March 2000 Revised June 2005
LM317 3-Terminal Positive Adjustable Regulator
General 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 shut-down and safe area compensation.
Features
s Output Current In Excess of 1.5A s Output Adjustable Between 1.2V and 37V s Internal Thermal Overload Protection s Internal Short Circuit Current Limiting s Output Transistor Safe Operating Area Compensation s TO-220 Package s D2 PAK Package
Ordering Code:
Product Number LM317T LM317D2TXM Package TO-220 D2 PAK Operating Temperature 0qC to 125qC 0qC to 125qC
Connection Diagrams
Internal Block Diagram
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 of Output Voltage Symbol VI - VO TLEAD PD Tj TSTG Value 40 230 Internally limited 0 a 125 Unit V
65 a 125 r0.02
Note 1: Absolute Maximum Ratings: are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated at these limits. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the absolute maximum ratings. The "Recommended Operating Conditions" table will define the conditions for actual device operation.
Electrical Characteristic
(VI - VO 5V, IO 0.5A, 0qC d TJ d 125qC, IMAX
Symbol Rline TA
1.5A, PDMAX
20W, unless otherwise specified)
Parameter Line Regulation (Note 2)
3V d VI VO d 40V 3V d VI VO d 40V Load Regulation (Note 2) Rload TA
25qc, 10mA d IO d IMAX
VO 5V VO t 5V 10mA d IO d IMAX VO 5V VO t 5V Adjustable Pin Current Adjustable Pin Current Change Reference Voltage IADJ
3V d VI VO d 40V 10mA d IO d IMAX PD d PMAX 3V d VIN - VO d 40V 10mA d IO d IMAX PD d PMAX
Temperature Stability Minimum Load Current to Maintain Regulation Maximum Output Current
STT IL(MIN) IO(MAX) VI - VO 40V
VI - VO d 15V, PD d PMAX VI - VO d 40V, PD d PMAX TA 25qC
eN RR ST RTJC
TA VO CADJ TA
25qC, 10Hz d f d 10KHz
10V, f 120Hz without CADJ 10PF (Note 3)
25qC for end point measurements, 1000HR
Thermal Resistance Junction to Case
Note 2: Load and line regulation are specified at constant junction temperature. Change in VD due to heating effects must be taken into account separately. Pulse testing with low duty is used. (PMAX 20S) Note 3: CADJ, when used, is connected between the adjustment pin and ground.
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LM317
Typical Performance Characteristics
FIGURE 1. Load Regulation
FIGURE 2. Adjustment Current
FIGURE 3. Dropout Voltage
FIGURE 4. Reference Voltage
Typical Application
Note: Ci is required when regulator is located an appreciable distance from power supply filter. Note: Co is not needed for stability, however, it does improve transient response. Note: Since IADJ is controlled to less than 100PA, the error associated with this term is negligible in most applications.
FIGURE 5. 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)
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