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Part: 06F9293
Category:
Power Management
-> Regulators
-> Voltage Regulators
Description: Ic-adj. Voltage Regulator
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LM317 Three-Terminal Adjustable Output Positive Voltage Regulator
The LM317 is an adjustable 3terminal positive voltage regulator capable of supplying in excess of 1.5 A over an output voltage range of 1.2 V to 37 V. This voltage regulator is exceptionally easy to use and requires only two external resistors to set the output voltage. Further, it employs internal current limiting, thermal shutdown and safe area compensation, making it essentially blowout proof. The LM317 serves a wide variety of applications including local, on card regulation. This device can also be used to make a programmable output regulator, or by connecting a fixed resistor between the adjustment and output, the LM317 can be used as a precision current regulator. · Output Current in Excess of 1.5 A
THREETERMINAL ADJUSTABLE POSITIVE VOLTAGE REGULATOR
SEMICONDUCTOR TECHNICAL DATA
· · · · · · ·
Output Adjustable between 1.2 V and 37 V Internal Thermal Overload Protection Internal Short Circuit Current Limiting Constant with Temperature Output Transistor SafeArea Compensation Floating Operation for High Voltage Applications Available in Surface Mount D2PAK, and Standard 3Lead Transistor Package Eliminates Stocking many Fixed Voltages
T SUFFIX PLASTIC PACKAGE CASE 221A Heatsink surface connected to Pin 2.
1 2 3
Standard Application
Vin LM317 R1 240 IAdj Cin* 0.1 µF R2 Adjust + C ** O 1.0 µF Vout
Pin 1. Adjust 2. Vout 3. Vin
D2T SUFFIX PLASTIC PACKAGE CASE 936 (D2PAK)
1
2 3
Heatsink surface (shown as terminal 4 in case outline drawing) is connected to Pin 2.
** Cin is required if regulator is located an appreciable distance from power supply filter. ** CO is not needed for stability, however, it does improve transient response. V out
+ 1.25 V
Since IAdj is controlled to less than 100 µA, the error associated with this term is negligible in most applications.
1) )I
R2 R1
ORDERING INFORMATION
Device LM317BD2T LM317BT LM317D2T LM317T TJ = 0° to +125°C Operating Temperature Range TJ = 40° to +125°C Package Surface Mount Insertion Mount Surface Mount Insertion Mount
Rev 1
Adj
R2
© Motorola, Inc. 1996
MOTOROLA ANALOG IC DEVICE DATA
1
LM317
MAXIMUM RATINGS
Rating InputOutput Voltage Differential Power Dissipation Case 221A TA = +25°C Thermal Resistance, JunctiontoAmbient Thermal Resistance, JunctiontoCase Case 936 (D2PAK) TA = +25°C Thermal Resistance, JunctiontoAmbient Thermal Resistance, JunctiontoCase Operating Junction Temperature Range Storage Temperature Range Symbol VIVO Value 40 Unit Vdc
PD JA JC PD JA JC TJ Tstg
Internally Limited 65 5.0 Internally Limited 70 5.0 40 to +125 65 to +150
W °C/W °C/W W °C/W °C/W °C °C
ELECTRICAL CHARACTERISTICS (VIVO = 5.0 V; IO = 0.5 A for D2T and T packages; TJ = Tlow to Thigh [Note 1]; Imax and Pmax
[Note 2]; unless otherwise noted.) Characteristics Line Regulation (Note 3), TA = +25°C, 3.0 V VIVO 40 V Load Regulation (Note 3), TA = +25°C, 10 mA IO Imax VO 5.0 V VO 5.0 V Thermal Regulation, TA = +25°C (Note 6), 20 ms Pulse Adjustment Pin Current Adjustment Pin Current Change, 2.5 V VIVO 40 V, 10 mA IL Imax, PD Pmax Reference Voltage, 3.0 V VIVO 40 V, 10 mA IO Imax, PD Pmax Line Regulation (Note 3), 3.0 V VIVO 40 V Load Regulation (Note 3), 10 mA IO Imax VO 5.0 V VO 5.0 V Temperature Stability (Tlow TJ Thigh) Minimum Load Current to Maintain Regulation (VIVO = 40 V) Maximum Output Current VIVO 15 V, PD Pmax, T Package VIVO = 40 V, PD Pmax, TA = +25°C, T Package RMS Noise, % of VO, TA = +25°C, 10 Hz f 10 kHz Ripple Rejection, VO = 10 V, f = 120 Hz (Note 4) Without CAdj CAdj = 10 µF LongTerm Stability, TJ = Thigh (Note 5), TA = +25°C for Endpoint Measurements Thermal Resistance Junction to Case, T Package 4 3 1, 2 3 1 2 Figure 1 2 Symbol Regline Regload Regtherm IAdj IAdj Vref Regline Regload 3 3 3 TS ILmin Imax 1.5 0.15 N RR 66 3 S RJC 65 80 0.3 5.0 1.0 %/1.0 k Hrs. °C/W 2.2 0.4 0.003 % VO dB 20 0.3 0.7 3.5 70 1.5 10 mV % VO % VO mA A 1.2 5.0 0.1 0.03 50 0.2 1.25 0.02 25 0.5 0.07 100 5.0 1.3 0.07 mV % VO % VO/W µA µA V %V Min Typ 0.01 Max 0.04 Unit %/V
NOTES: 1. Tlow to Thigh = 0° to +125°C, for LM317T, D2T. Tlow to Thigh = 40° to +125°C, for LM317BT, BD2T. 2. Imax = 1.5 A, Pmax = 20 W 3. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately. Pulse testing with low duty cycle is used. 4. CAdj, when used, is connected between the adjustment pin and ground. 5. Since LongTerm Stability cannot be measured on each device before shipment, this specification is an engineering estimate of average stability from lot to lot. 6. Power dissipation within an IC voltage regulator produces a temperature gradient on the die, affecting individual IC components on the die. These effects can be minimized by proper integrated circuit design and layout techniques. Thermal Regulation is the effect of these temperature gradients on the output voltage and is expressed in percentage of output change per watt of power change in a specified time.
2
MOTOROLA ANALOG IC DEVICE DATA
LM317
Representative Schematic Diagram
Vin 31 0 310 230 120 5.6k 6.3V 170 6.7k 125k 135 12.4k 12k 5.0pF 6.8k 510 6.3V 160 200 13k
30 pF 6.3V 190 3.6k 5.8k 110 5.1k
30 pF
2.4k 12.5k
105 4.0
0.1 Vout Adjust This device contains 29 active transistors.
Figure 1. Line Regulation and IAdj/Line Test Circuit
VCC * VIH VIL Vin LM317 * Pulse testing required. * 1% Duty Cycle * is suggested. Adjust Cin 0.1 µF IAdj R1 240 1% Line Regulation (% Vout
V) +
|V
V | OH OL x 100 |V | OL
VOH VOL
+ CO
1.0 µF
RL
R2 1%
MOTOROLA ANALOG IC DEVICE DATA
3
LM317
Figure 2. Load Regulation and IAdj/Load Test Circuit
VI Vin LM317 Vout IL RL (max Load) * + IAdj CO 1.0 µF VO (min Load) VO (max Load) RL (min Load)
Adjust Cin 0.1 µF
R1
240 1%
R2 1%
* Pulse testing required. * 1% Duty Cycle is suggested.
Load Regulation (mV) = VO (min Load) VO (max Load)
Load Regulation (% VO) =
VO (min Load) VO (max Load) x 100 VO (min Load)
Figure 3. Standard Test Circuit
Vin LM317 Vout IL
Adjust VI Cin 0.1 µF R1 IAdj
240 1%
Vref + CO 1.0 µF
RL VO
ISET R2 1%
* Pulse testing required. * 1% Duty Cycle is suggested.
To Calculate R2: Vout = ISET R2 + 1.250 V To Calculate R2: Assume ISET = 5.25 mA
Figure 4. Ripple Rejection Test Circuit
24 V 14 V f = 120 Hz Vin LM317 Vout
Adjust Cin 0.1 µF
R1
240 1%
D1* 1N4002 + CO 1.0 µF
RL VO
Vout = 10 V
R2
1.65 k 1%
+ CAdj
10 µF
* D1 Discharges CAdj if output is shorted to Ground.
4
MOTOROLA ANALOG IC DEVICE DATA
LM317
Figure 5. Load Regulation
4.0 Vout, OUTPUT VOLTAGE CHANGE (%) 0.4 I out , OUTPUT CURRENT (A) 0.2 0 0.2 0.4 0.6 0.8 1.0 50 25 0 25 50 75 100 TJ, JUNCTION TEMPERATURE (°C) 125 150 0 0 10 20 30 VinVout, INPUTOUTPUT VOLTAGE DIFFERENTIAL (Vdc) 40 Vin = 15 V Vout = 10 V IL = 1.5 A IL = 0.5 A 3.0 TJ = 25°C 2.0 150°C 1.0 55°C
Figure 6. Current Limit
Figure 7. Adjustment Pin Current
3.0 I Adj, ADJUSTMENT PIN CURRENT ( µA) V inVout, INPUTOUTPUT VOLTAGE DIFFERENTIAL (Vdc) 70 65 60 55 50 45 40 35 50 25 0 25 50 75 100 125 150
Figure 8. Dropout Voltage
Vout = 100 mV 2.5
IL = 1.5 A
1.0 A 2.0 500 mA 1.5 200 mA 20 mA 1.0 50 25 0 25 50 75 100 125 150
TJ, JUNCTION TEMPERATURE (°C)
TJ, JUNCTION TEMPERATURE (°C)
Figure 9. Temperature Stability
1.26 Vref, REFERENCE VOLTAGE (V) IB, QUIESCENT CURRENT (mA) 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 1.22 50 25 0 25 50 75 100 125 TJ, JUNCTION TEMPERATURE (°C) 150 0 0
Figure 10. Minimum Operating Current
TJ = 55°C +25°C +150°C
1.25
1.24
1.23
10 20 30 40 VinVout, INPUTOUTPUT VOLTAGE DIFFERENTIAL (Vdc)
MOTOROLA ANALOG IC DEVICE DATA
5
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