1.2V TO 37V VOLTAGE REGULATOR
s s s s
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 and D2PAKpackages 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.
TO-220FPABSOLUTE MAXIMUM RATING
Symbol V i-o IO T op Parameter Input-output Differential Voltage Output Current Operating Junction Temperature for: LM117 LM217 LM317 Power Dissipation Storage Temperature Value 40 Intenrally Limited -55 to 150 -25 to 150 0 to 125 Internally Limited - 65 to 150
o o o
C C o C
P tot T st g
Symbol Parameter Max Max TO-3 4 35 TO-220 350 TO-220FP 5 60 D2PAK 3 62.5 Unit
R thj- ca se Thermal Resistance Junction-case R thj- amb Thermal Resistance Junction-ambient
CONNECTION DIAGRAM AND ORDERING NUMBERS (top view)
Type LM117 LM217 LM317
TO-3 LM117K LM217K LM317K
TO-220 LM217T LM317T
D PAK LM217D2T
BASIC ADJUSTABLE REGULATOR
ELECTRICAL CHARACTERISTICS (Vi - Vo = 5 V, Io = 500 mA, IMAX = 1.5A and PMAX = 20W, unless otherwise specified)
Symbol ∆V o ∆V o Parameter Line Regulation Load Regulation Test Conditions Vi - Vo = 3 to 40 V Vo ≤ 5V Io = 10 mA to IMAX Vo ≥ 5V Io = 10 mA to IMAX I ADJ ∆I ADJ V REF Adjustment Pin CurrentAdjustment Pin Current Vi - Vo = 2.5 to 40 V Io = 10 mA to IMAX Reference Voltage Vi - Vo = 2.5 to 40 V (between pin 3 and pin Io = 10 mA to IMAX 1) PD ≤ PMAX Output Voltage Temperature Stability Minimum Load Current Vi - Vo = 40 V Maximum Load Current Vi - Vo ≤ 15 V PD < PMAX Vi - Vo = 40 V PD < PMAX o Tj = 25 C eN SVR Output Noise Voltage (percentance of VO) Supply Voltage Rejection (*) B = 10Hzto 10KHz Tj = 25 oC Tj = 25 oC f = 120 Hz C ADJ =0 C ADJ =10µF 66 1.5 1.2 T j = 25 o C T j = 25 C T j = 25 C
LM117/LM217 Min. Typ. 0.01 0.02 5 20 0.1 0.3 50 0.2 1.25 Max. 0.02 0.05 15 50 0.3 1 100 5 1.3 1.2 Min.
LM317 Typ. 0.01 0.02 5 20 0.1 0.3 50 0.2 1.25 Max. 0.04 0.07 25 70 0.5 1.5 100 5 1.3
Unit %/V %/V mV mV % % µA µA V
∆ Vo Vo I o (m in) I o (max )
1 3.5 2.2 0.4 5 1.51 3.5 2.2 0.4 10
% mA A A
0.003 65 80 66
0.003 65 80
% dB dB
(*) CADJ is connected between pin 1 and ground. Note: (1) Unless otherwise specified the above specs, apply over the following conditions : LM 117 Tj = – 55 to 150°C; LM 217 Tj = – 25 to 150°C ; LM 317 Tj = 0 to 125°C.
Figure 1 : Output Current vs. Input-output Differential Voltage. Figure 2 :Dropout Voltage vs. Junction Temperature.
Figure 3 : Reference Voltage vs. Junction
Figure 4 : Basic Adjustable Regulator.
APPLICATION INFORMATION The 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: R2 VO =VREF (1 + ) + IADJ R2 R1 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...