TO-220 TO-220FP D²PAK Features • Output voltage range: 1.2 to 37 V • Output current in excess of 1.5 A • 0.1% line and load regulation • Floating operation for high voltages • Complete series of protections: current limiting, thermal shutdown and SOA control Description The LM217, LM317 are monolithic integrated circuits in TO-220, TO-220FP and D²PAK packages intended for use as positive adjustable voltage regulators. They are designed to supply more than 1.5 A of load current with an output voltage adjustable over a 1.2 to 37 V range. The nominal output voltage is selected by means of a resistive divider, making the device exceptionally easy to use and eliminating the stocking of many fixed regulators. Maturity status link LM217 LM317 1.2 V to 37 V adjustable voltage regulators LM217, LM317 Datasheet DS0433 - Rev 20 - May 2018 For further information contact your local STMicroelectronics sales office. www.st.com
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Datasheet - LM217, LM317 - 1.2 V to 37 V adjustable ...D²PAK packages intended for use as positive adjustable voltage regulators. They are designed to supply more than 1.5 A of load
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TO-220 TO-220FP
D²PAK
Features• Output voltage range: 1.2 to 37 V• Output current in excess of 1.5 A• 0.1% line and load regulation• Floating operation for high voltages• Complete series of protections: current limiting, thermal shutdown and SOA
control
DescriptionThe LM217, LM317 are monolithic integrated circuits in TO-220, TO-220FP andD²PAK packages intended for use as positive adjustable voltage regulators.
They are designed to supply more than 1.5 A of load current with an output voltageadjustable over a 1.2 to 37 V range.
The nominal output voltage is selected by means of a resistive divider, making thedevice exceptionally easy to use and eliminating the stocking of many fixedregulators.
Maturity status link
LM217
LM317
1.2 V to 37 V adjustable voltage regulators
LM217, LM317
Datasheet
DS0433 - Rev 20 - May 2018For further information contact your local STMicroelectronics sales office.
VI - VO = 5 V, IO = 500 mA, IMAX = 1.5 A and PMAX = 20 W, TJ = - 55 to 150 °C, unless otherwise specified.
Table 3. Electrical characteristics for LM217
Symbol Parameter Test conditions Min. Typ. Max. Unit
ΔVO Line regulation VI - VO = 3 to 40 VTJ = 25°C 0.01 0.02
%/V0.02 0.05
ΔVO Load regulation
VO ≤ 5 V
IO = 10 mA to IMAX
TJ= 25°C 5 15mV
20 50
VO ≥ 5 V,
IO = 10 mA to IMAX
TJ = 25°C 0.1 0.3%
0.3 1
IADJ Adjustment pin current 50 100 µA
ΔIADJ Adjustment pin current VI - VO = 2.5 to 40 V IO = 10 mA to IMAX 0.2 5 µA
VREF Reference voltageVI - VO = 2.5 to 40 V IO = 10 mA to IMAX
PD ≤ PMAX1.2 1.25 1.3 V
ΔVO/VOOutput voltage temperature
stability 1 %
IO(min) Minimum load current VI - VO = 40 V 3.5 5 mA
IO(max) Maximum load currentVI - VO ≤ 15 V, PD < PMAX 1.5 2.2
AVI - VO = 40 V, PD < PMAX, TJ = 25°C 0.4
eN Output noise voltage (percentageof VO) B = 10 Hz to 100 kHz, TJ = 25°C 0.003 %
SVR Supply voltage rejection (1) TJ = 25°C, f = 120 HzCADJ = 0 65
dBCADJ = 10 µF 66 80
1. CADJ is connected between adjust pin and ground.
LM217, LM317Electrical characteristics
DS0433 - Rev 20 page 5/32
VI - VO = 5 V, IO = 500 mA, IMAX = 1.5 A and PMAX = 20 W, TJ = 0 to 125 °C, unless otherwise specified.
Table 4. Electrical characteristics for LM317
Symbol Parameter Test conditions Min. Typ. Max. Unit
ΔVO Line regulation VI - VO = 3 to 40 VTJ = 25°C 0.01 0.04
%/V0.02 0.07
ΔVO Load regulation
VO ≤ 5 V
IO = 10 mA to IMAX
TJ= 25°C 5 25mV
20 70
VO ≥ 5 V,
IO = 10 mA to IMAX
TJ = 25°C 0.1 0.5%
0.3 1.5
IADJ Adjustment pin current 50 100 µA
ΔIADJ Adjustment pin currentVI - VO = 2.5 to 40 V
IO = 10 mA to IMAX0.2 5 µA
VREFReference voltage (between pin 3
and pin 1)
VI - VO = 2.5 to 40 V
IO = 10 mA to IMAX
PD ≤ PMAX
1.2 1.25 1.3 V
ΔVO/VOOutput voltage temperature
stability 1 %
IO(min) Minimum load current VI - VO = 40 V 3.5 10 mA
IO(max) Maximum load currentVI - VO ≤ 15 V, PD < PMAX 1.5 2.2
AVI - VO = 40 V, PD < PMAX, TJ = 25°C 0.4
eN Output noise voltage (percentageof VO) B = 10 Hz to 100 kHz, TJ = 25°C 0.003 %
SVR Supply voltage rejection (1) TJ = 25°C, f = 120 HzCADJ = 0 65
dBCADJ = 10 µF 66 80
1. CADJ is connected between adjust pin and ground.
LM217, LM317Electrical characteristics
DS0433 - Rev 20 page 6/32
VI - VO = 5 V, IO = 500 mA, IMAX = 1.5 A and PMAX = 20 W, TJ = - 40 to 125 °C, unless otherwise specified.
Table 5. Electrical characteristics for LM317B
Symbol Parameter Test conditions Min. Typ. Max. Unit
ΔVO Line regulation VI - VO = 3 to 40 VTJ = 25°C 0.01 0.04
%/V0.02 0.07
ΔVO Load regulation
VO ≤ 5 V
IO = 10 mA to IMAX
TJ= 25°C 5 25mV
20 70
VO ≥ 5 V,
IO = 10 mA to IMAX
TJ = 25°C 0.1 0.5%
0.3 1.5
IADJ Adjustment pin current 50 100 µA
ΔIADJ Adjustment pin currentVI - VO = 2.5 to 40 V
IO = 10 mA to 500 mA0.2 5 µA
VREFReference voltage (between pin 3
and pin 1)
VI - VO = 2.5 to 40 V
IO = 10 mA to 500 mA
PD ≤ PMAX
1.2 1.25 1.3 V
ΔVO/VOOutput voltage temperature
stability 1 %
IO(min) Minimum load current VI - VO = 40 V 3.5 10 mA
IO(max) Maximum load currentVI - VO ≤ 15 V, PD < PMAX 1.5 2.2
AVI - VO = 40 V, PD < PMAX, TJ = 25°C 0.4
eN Output noise voltage (percentageof VO) B = 10 Hz to 100 kHz, TJ = 25°C 0.003 %
SVR Supply voltage rejection (1) TJ = 25°C, f = 120 HzCADJ = 0 65
dBCADJ = 10 µF 66 80
1. CADJ is connected between adjust pin and ground.
LM217, LM317Electrical characteristics
DS0433 - Rev 20 page 7/32
5 Typical characteristics
Figure 3. Output current vs. input-output differential voltage Figure 4. Dropout voltage vs. junction temperature
Figure 5. Reference voltage vs. junction
LM217, LM317Typical characteristics
DS0433 - Rev 20 page 8/32
Figure 6. Basic adjustable regulator
Input Output
Adj
LM217, LM317Typical characteristics
DS0433 - Rev 20 page 9/32
6 Application information
The LM217, LM317 provides an internal reference voltage of 1.25 V between the output and adjustmentsterminals. This is used to set a constant current flow across an external resistor divider (see Figure 6. Basicadjustable regulator), giving an output voltage VO of:VO = VREF (1 + R2/R1) + IADJ R2
The device was designed to minimize the term IADJ (100 µA max) and to maintain it very constant with line andload changes. Usually, the error term IADJ × R2 can be neglected. To obtain the previous requirement, all theregulator quiescent current is returned to the output terminal, imposing a minimum load current condition. If theload is insufficient, the output voltage will rise. Since the LM217, LM317 is a floating regulator and "sees" only theinput-to- output differential voltage, supplies of very high voltage with respect to ground can be regulated as longas the maximum input-to-output differential is not exceeded. Furthermore, programmable regulators are easilyobtainable and, by connecting a fixed resistor between the adjustment and output, the device can be used as aprecision current regulator. In order to optimize the load regulation, the current set resistor R1 (see Figure 6. Basicadjustable regulator) should be tied as close as possible to the regulator, while the ground terminal of R2 shouldbe near the ground of the load to provide remote ground sensing. Performance may be improved with addedcapacitance as follow:• An input bypass capacitor of 0.1 µF• An adjustment terminal to ground 10 µF capacitor to improve the ripple rejection of about 15 dB (CADJ).• An 1 µF tantalum (or 25 µF Aluminium electrolytic) capacitor on the output to improve transient response. In
addition to external capacitors, it is good practice to add protection diodes, as shown in figure below D1protect the device against input short circuit, while D2 protect against output short circuit for capacitancedischarging.
Figure 7. Voltage regulator with protection diodes
Input Output
Adjust
Note: D1 protect the device against input short circuit, while D2 protects against output short circuit for capacitorsdischarging.
LM217, LM317Application information
DS0433 - Rev 20 page 10/32
Figure 8. Slow turn-on 15 V regulator
Input Output
Adjust
Figure 9. Current regulator
Input OutputAdjust
IO = (VREF / R1) + IADJ = 1.25 V / R1
Figure 10. 5 V electronic shut-down regulator
Input Output
Adjust
LM217, LM317Application information
DS0433 - Rev 20 page 11/32
Figure 11. Digitally selected outputs
Input Output
Adjust
(R2 sets maximum VO)
Figure 12. Battery charger (12 V)
Input Output
Adjust
* RS sets output impedance of charger ZO = RS (1 + R2 / R1). Use of RS allows low charging rates whit fullycharged battery.
Figure 13. Current limited 6 V charger
Input Output
Adjust
* R3 sets peak current (0.6 A for 10).** C1 recommended to filter out input transients.
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