LM217L/LM317L ABSOLUTE MAXIMUM RATING PIN CONNECTION AND ORDERING NUMBER TEST CIRCUIT

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Isaac Williamson
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1 LM217L LOW CURRENT 1.2V TO 37V ADJUSTABLE VOLTAGE REGULATOR OUTPUT VOLTAGE RANGE : 1.2 TO 37V OUTPUT CURRENT IN EXCESS OF 100 ma LINE REGULATION TYP. 0.01% LOAD REGULATION TYP. 0.1% THERMAL OVERLOAD PROTECTION SHORT CIRCUIT PROTECTION. OUTPUT TRANSISTOR SAFE AREA COM- PENSATION FLOATING OPERATION FOR HIGH VOLTAGE APPLICATIONS DESCRIPTION The LM217L/ are monolithic integrated circuit in SO-8 and TO-92 packages intended for use as positive adjustable voltage regulators. They are designed to supply until 100 ma 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. SO-8 TO-92 SCHEMATIC DIAGRAM April /8

2 LM217L/ ABSOLUTE MAXIMUM RATING Symbol Parameter Value Unit Vi -Vo Input-Output Differential Voltage 40 V P d Power Dissipation Internally Limited T opr Operating Junction Temperature Range for LM217L for -40 to to 125 o C C Tstg Storage Temperature Range -55 to 150 o C PIN CONNECTION AND ORDERING NUMBER SO-8 TO-92 BOTTOM VIEW pin 1 = ADJUST pin 2 = IN pin 3 = OUT Type SO-8 TO-92 LM217L LM217LD LM217LZ D Z TEST CIRCUIT 2/8

3 LM217L/ ELECTRICAL CHARACTERISTICS FOR LM217L (Refer to the test circuits, -40 Tj 125 o C Vi -Vo=5V,Io= 40 ma, unless otherwise specified) Symbol Parameter Test Conditions Min. Typ. Max. Unit Vo Line Regulation Vi -Vo = 3 to 40 V Tj=25 o C %/V IL <20mA %/V Vo Load Regulation Vo 5V Tj =25 o C 5 15 mv mv Vo 5V Tj =25 o C % % IADJ Adjustment Pin Current µa I ADJ Adjustment Pin Current V i -V o = 3 to 40 V µa I o = 5 ma to 100 ma P d < 625 mw VREF Reference Voltage Vi -Vo = 3 to 40 V V Pd < 625 mw V o Output Voltage Temperature 0.7 % Vo Stability I o(min) Minimum Load Current V i -V o = 40 V ma Io(max) Maximum Output Current Vi -Vo = 3 to 13 V Vi -Vo =40V e N Output Noise Voltage (percentance of VO) (*) CADJ is connected between Adjust pin and Ground. B = 10Hz to 10KHz Tj =25 o C SVR Supply Voltage Rejection (*) T j =25 o C f = 120 Hz ma % C ADJ =0 65 db CADJ=10µF db ELECTRICAL CHARACTERISTICS FOR (Refer to the test circuits, 0 Tj 125 o C Vi -Vo=5V,Io= 40 ma, unless otherwise specified) Symbol Parameter Test Conditions Min. Typ. Max. Unit V o Line Regulation V i -V o = 3 to 40 V T j =25 o C %/V IL <20mA %/V V o Load Regulation V o 5V T j =25 o C 5 25 mv mv V o 5V T j =25 o C % % I ADJ Adjustment Pin Current µa IADJ Adjustment Pin Current Vi -Vo = 3 to 40 V µa I o = 5 ma to 100 ma P d < 625 mw VREF Reference Voltage Vi -Vo = 3 to 40 V V Pd < 625 mw V o Output Voltage Temperature 0.7 % Vo Stability I o(min) Minimum Load Current V i -V o = 40 V ma Io(max) Maximum Output Current Vi -Vo = 3 to 13 V Vi -Vo =40V e N Output Noise Voltage (percentance of V O ) B = 10Hz to 10KHz T j =25 o C SVR Supply Voltage Rejection (*) Tj =25 o C f = 120 Hz (*) CADJ is connected between Adjust pin and Ground ma % CADJ=0 65 db C ADJ =10µF db 3/8

4 LM217L/ Current Limit Minimum Operating Current APPLICATION INFORMATION The 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: V O =V REF (1 + R 2 R 1 ) +I ADJ R 2 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 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, thedevice canbe used as a precision current regulator. In order to optimise 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. Figure 4 : Basic Adjustable Regulator. 4/8

5 LM217L/ Voltage Regulator with Protection Diodes. Slow Turn-on 15V Regulator. Current Regulator. I o = V ref R 1 + I ADJ 1.25V R 1 5V Electronic Shut-down Regulator. Digitally Selected Outputs. (R2 sets maximum Vo) 5/8

6 LM217L/ SO8 MECHANICAL DATA DIM. mm inch MIN. TYP. MAX. MIN. TYP. MAX. A a a a b b C c1 45 (typ.) D E e e F L M S 8 (max.) P013M 6/8

7 LM217L/ TO-92 MECHANICAL DATA DIM. mm inch MIN. TYP. MAX. MIN. TYP. MAX. A B C D E F G A D E F B E C G G 7/8

LM217L LM317L LOW CURRENT 1.2 TO 37V ADJUSTABLE VOLTAGE REGULATOR

LM217L LM317L LOW CURRENT 1.2 TO 37V ADJUSTABLE VOLTAGE REGULATOR OUTPUT VOLTAGE RANGE: 1.2 TO 37V OUTPUT CURRENT IN EXCESS OF 100 ma LINE REGULATION TYP. 0.01% LOAD REGULATION TYP. 0.1% THERMAL OVERLOAD