LM217D2T-TR ,1.2V TO 37V ADJUSTABLE VOLTAGE REGULATORAbsolute Maximum Ratings Symbol Parameter Value UnitV - V Input-Reference Differential Voltage40 ..
LM217K ,1.2V TO 37V ADJUSTABLE VOLTAGE REGULATORAbsolute Maximum Ratings are those values beyond which damage to the device may occur. Functional o ..
LM217L ,1.2V TO 37V ADJUSTABLE VOLTAGE REGULATOR LOW CURRENTELECTRICAL CHARACTERISTICS OF LM217L (refer to the test circuits, T = - 40 to 125°C,JV -V =5V,I = 4 ..
LM217LD ,1.2V TO 37V ADJUSTABLE VOLTAGE REGULATOR LOW CURRENTELECTRICAL CHARACTERISTICS OF LM217L (refer to the test circuits, T = - 40 to 125°C,JV -V =5V,I = 4 ..
LM217LD13TR ,1.2V TO 37V ADJUSTABLE VOLTAGE REGULATOR LOW CURRENTAPPLICATIONSDESCRIPTIONTO-92 SO-8The LM217L/LM317L are monolithic integratedcircuit in SO-8 and TO- ..
LM217LZ ,1.2V TO 37V ADJUSTABLE VOLTAGE REGULATOR LOW CURRENTABSOLUTE MAXIMUM RATINGSSymbol Parameter² Value UnitV V Input-Output Differential Voltage40 VI- OP ..
LM4040C30IDBZRG4 ,3-V Precision Micropower Shunt Voltage Reference, 0.5% accuracy 3-SOT-23 -40 to 85
LM4040C30IDBZT ,3-V Precision Micropower Shunt Voltage Reference, 0.5% accuracy
LM4040C30IDCKT ,3-V Precision Micropower Shunt Voltage Reference, 0.5% accuracy
LM4040C30QDBZR ,3-V Precision Micropower Shunt Voltage Reference, 0.5% accuracy
LM4040C-4.1 ,4.096-V Precision Micropower Shunt Voltage Reference, 0.5% accuracy
LM4040C41IDBZR ,4.096-V Precision Micropower Shunt Voltage Reference, 0.5% accuracy
LM217-LM217D2T-TR-LM317D2T-TR
1.2V TO 37V ADJUSTABLE VOLTAGE REGULATOR
1/15September 2004 OUTPUT VOLTAGE RANGE: 1.2 TO 37V OUTPUT CURRENT IN EXCESS OF 1.5A 0.1% LINE AND LOAD REGULATION FLOATING OPERATION FOR HIGH
VOLTAGES COMPLETE SERIES OF PROTECTIONS:
CURRENT LIMITING, THERMAL
SHUTDOWN AND SOA CONTROL
DESCRIPTION The LM117/LM217/LM317 are monolithic
integrated circuit in TO-220, TO-220FP, TO-3 and2 PAK packages intended for use as positive
adjustable voltage regulators.
They are designed to supply more than 1.5A of
load current with an output voltage adjustable over
a 1.2 to 37V range.
The nominal output voltage is selected by means
of only a resistive divider, making the device
exceptionally easy to use and eliminating the
stocking of many fixed regulators.
LM117/217
LM3171.2V TO 37V VOLTAGE REGULATOR
Figure 1: Schematic DiagramRev. 10
LM117/217/3172/15
Table 1: Absolute Maximum Ratings Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is
not implied.
Table 2: Thermal Data
Figure 2: Connection Diagram (top view)
Table 3: Order Codes
LM117/217/3173/15
Figure 3: Basic Adjustable Regulator
Table 4: Electrical Characteristics For LM117/LM217 (VI - VO = 5 V, IO = 500 mA, I MAX = 1.5 A and MAX = 20 W, TJ = -55 to 150°C for LM117, TJ = -25 to 150°C for LM217, unless otherwise specified).
(*) CADJ is connected between pin 1 and ground.
LM117/217/3174/15
Table 5: Electrical Characteristics For LM317 (VI - VO = 5 V, IO = 500 mA, I MAX = 1.5 A and MAX = 20 W, TJ = 0 to 125°C, unless otherwise specified).
(*) CADJ is connected between pin 1 and ground.
Figure 4: Output Current vs Input-output Differential Voltage
Figure 5: Dropout Voltage vs Junction Temperature
LM117/217/3175/15
Figure 6: Reference Voltage vs Junction
Figure 7: Basic Adjustable Regulator
APPLICATION INFORMATIONThe LM117/217/317 provides an internal reference voltage of 1.25V between the output and adjustments
terminals. This is used to set a constant current flow across an external resistor divider (see fig. 4), giving
an output voltage VO of:
VO = VREF (1 + R2/R1) + IADJ R2
The device was designed to minimize the term IADJ (100µA max) and to maintain it very constant with line
and load changes. Usually, the error term IADJ × R2 can be neglected. To obtain the previous requirement,
all the regulator quiescent current is returned to the output terminal, imposing a minimum load current
condition. If the load is insufficient, the output voltage will rise. Since the LM117/217317 is a floating
regulator and "sees" only the input-to-output differential voltage, supplies of very high voltage with respect
to ground can be regulated as long as the maximum input-to-output differential is not exceeded.
Furthermore, programmable regulator are easily obtainable and, by connecting a fixed resistor between
the adjustment and output, the device can be used as a precision current regulator. In order to optimize
the load regulation, the current set resistor R1 (see fig. 4) should be tied as close as possible to the
regulator, while the ground terminal of R2 should be near the ground of the load to provide remote ground
sensing. Performance may be improved with added capacitance as follow:
An input bypass capacitor of 0.1µF
An adjustment terminal to ground 10µF capacitor to improve the ripple rejection of about 15 dB (C ADJ).
An 1µF tantalum (or 25µFAluminium electrolytic) capacitor on the output to improve transient response. In
additional to external capacitors, it is good practice to add protection diodes, as shown in fig.5. D1 protect
the device against input short circuit, while D2 protect against output short circuit for capacitance
discharging.
LM117/217/3176/15
Figure 8: Voltage Regulator with Protection Diodes D1 protect the device against input short circuit, while D2 protects against output short circuit for capacitors discharging.
Figure 9: Slow Turn-on 15V Regulator
Figure 10: Current Regulator
LM117/217/3177/15
Figure 11: 5V Electronic Shut-down Regulator
Figure 12: Digitally Selected Outputs (R2 sets maximum VO)
Figure 13: Battery Charger (12V) * RS sets output impedance of charger ZO = RS (1 + R2/R1). Use of RS allows low charging rates whit fully charged battery.
LM117/217/3178/15
Figure 14: Current Limited 6V Charger * R3 sets peak current (0.6A for 1 0).
** C1 recommended to filter out input transients
