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Details, datasheet, quote on part number:LM317T4
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| Part: | LM317T4 |
| Category: | Power Management => Regulators => Linear Voltage Regulators |
| Description: | Three-terminal Adjustable Output Positive Voltage Regulator |
| Company: | ON Semiconductor |
| Datasheet: | Download LM317T4 datasheet File size : 126 kB |
| Request For quote: | Find where to buy LM317T4
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Datasheet text preview:
LM317, NCV317 1.5 A Adjustable Output, Positive Voltage Regulator
The LM317 is an adjustable 3-terminal 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 blow-out 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 · Output Adjustable between 1.2 V and 37 V · Internal Thermal Overload Protection · Internal Short Circuit Current Limiting Constant with Temperature · Output Transistor Safe-Area Compensation · Floating Operation for High Voltage Applications · Available in Surface Mount D2PAK, and Standard 3-Lead Transistor Package · Eliminates Stocking many Fixed Voltages
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T SUFFIX PLASTIC PACKAGE CASE 221A
1 2 3
Pin 1. Adjust 2. Vout 3. Vin Heatsink surface connected to Pin 2.
D2T SUFFIX PLASTIC PACKAGE CASE 936 (D2PAK)
1 2 3
Vin
LM317
Vout R1 240 Heatsink surface (shown as terminal 4 in case outline drawing) is connected to Pin 2. + C ** O 1.0 µF
IAdj Cin* 0.1 µF
Adjust
ORDERING INFORMATION
See detailed ordering and shipping information in the package dimensions section on page 10 of this data sheet.
R2
DEVICE MARKING INFORMATION
See general marking information in the device marking section on page 10 of this data sheet.
** 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
1) )
R2 R1
I
R Adj 2
Since IAdj is controlled to less than 100 µA, the error associated with this term is negligible in most applications.
Figure 1. Standard Application
© Semiconductor Components Industries, LLC, 2003
1
February, 2003 - Rev. 4
Publication Order Number: LM311/D
LM317, NCV317
MAXIMUM RATINGS
Rating Input-Output Voltage Differential Power Dissipation Case 221A TA = +25°C Thermal Resistance, Thermal Resistance, Case 936 (D2PAK) TA = +25°C Thermal Resistance, Thermal Resistance, Symbol VI-V O Value 40 Unit Vdc
Junction-to-Ambient Junction-to-Case
PD JA JC PD JA JC TJ Tstg
Internally Limited 65 5.0 Internally Limited 70 5.0 - 55 to +150 - 65 to +150
W °C/W °C/W W °C/W °C/W °C °C
Junction-to-Ambient Junction-to-Case
Operating Junction Temperature Range Storage Temperature Range
ELECTRICAL CHARACTERISTICS (VI-V O = 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 VI-V O 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 4), 20 ms Pulse Adjustment Pin Current Adjustment Pin Current Change, 2.5 V VI-V O 40 V, 10 mA IL Imax, PD Pmax Reference Voltage, 3.0 V VI-V O 40 V, 10 mA IO Imax, PD Pmax Line Regulation (Note 3), 3.0 V VI-V O 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 (VI-V O = 40 V) Maximum Output Current VI-V O 15 V, PD Pmax, T Package VI-V O = 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 5) Without CAdj CAdj = 10 µF Long-T erm Stability, TJ = Thigh (Note 6), 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 R J C 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
1. Tlow to Thigh = 0° to +125°C, for LM317T, D2T. Tlow to Thigh = - 40° to +125°C, for LM317BT, BD2T, Tlow to Thigh = - 55° to +150°C, for NCV317BT, 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. 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. 5. CAdj, when used, is connected between the adjustment pin and ground. 6. Since Long-Term Stability cannot be measured on each device before shipment, this specification is an engineering estimate of average stability from lot to lot.
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LM317, NCV317
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 Adjus This device contains 29 active transistors.
Figure 2. Representative Schematic Diagram
VCC * VIH VIL Vin * Pulse testing required. * 1% Duty Cycle * is suggested. LM317 Adjust Cin 0.1 µF IAdj R1 Line Regulation (% V) + | Vout V V | OH OL x 100 |V | OL VOH VOL
240 1%
+ CO
1.0 µF
RL
R2 1%
Figure 3. Line Regulation and IAdj/Line Test Circuit
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