LM317L LINEAR INTEGRATED CIRCUIT LOW CURRENT 1.25V TO 37V ADJUSTABLE VOLTAGE REGULATOR DESCRIPTION SOP-8 The Contek LM317L is a monolithic integrated circuit, designed for use as positive adjustable voltage regulator. It is designed to supply until 100mA of load current with an output voltage adjustable over a 1.25V 1 to 37V range. TO-92 FEATURES *Output voltage range: 1.25V to 37V *Output current in excess of 100mA *Line regulation typ. 0.01% *Load regulation typ. 0.1% *Thermal overload protection *Short circuit protection *Output transistor safe area compensation *Floating operation for high voltage applications PIN CONFIGURATIONS 1 2 3 ADJUST VIN 1 VOUT 2 VOUT 3 Contek LM317L 8 NC 7 VOUT 6 VOUT 5 NC IN ADJ OUT TO-92 Plastic Package Bottom View 4 SOP-8 PACKAGE ABSOLUTE MAXIMUM RATING PARAMETER Input-Output Differential Voltage Power Dissipation Operating Junction Temperature Range Storage Temperature Range SYMBOL VALUE UNIT Vi-Vo Pd Topr Tstr 40 Internally Limited 0~125 -55 ~ 150 V Contek Microelectronics Co.,Ltd. CONTEK http://www.contek-ic.com E-mail:sales@contek-ic.com C C 1 LM317L LINEAR INTEGRATED CIRCUIT SCHEMATIC DIAGRAM INPUT R1 R2 R3 R4 Q22 R5 D2 Q10 Q1 R19 Q14 Q2 R6 Q4 Q8 Q13 R8 R7 Q18 Q16 R16 Q19 Q17 Q6 Q7 Q25 R18 Q26 Q20 Q15 Q21 C1 Q9 R17 R21 C3 R22 D3 R20 C2 Q11 Q12 R15 R24 D1 R14 Q3 R23 R25 Q5 R10R11R12 R26 R13 R9 OUTPUT Contek ADJUST TEST CIRCUIT Vi 3 Contek LM317L 2 1 Vref Vo R1 Cin 0.1mF Cout 1mF Iadj R2 Contek Microelectronics Co.,Ltd. CONTEK http://www.contek-ic.com E-mail:sales@contek-ic.com 2 LM317L LINEAR INTEGRATED CIRCUIT ELECTRICAL CHARACTERISTICS(Vi-Vo=5V, Io=40mA, 0<=Tj<=125 C, unless otherwise specified) TEST CONDITIONS SYMBOL Line Regulation DVo Vi-Vo=3~40V IL<20mA Tj=25 C Load Regulation DVo Vo<=5V Io=5~100mA Tj=25 C 5 25 mV Tj=25 C 20 0.1 70 0.5 mV % 0.3 50 0.2 1.5 100 5 % mA mA 1.2 1.25 1.3 V 5 100 0.7 3.5 200 50 0.003 % mA mA Vo>=5V Io=5~100mA Adjustment Pin Current Adjustment Pin Current IADJ DIADJ Reference Voltage VREF Output Voltage Temperature Stability Minimum Load Current Maximum Output Current DVo/Vo Io(min) Io(max) Output Noise Voltage (Percentance of Vo) Supply Voltage Rejection(*) eN MIN TYP MAX UNIT 0.01 0.04 %/V PARAMETER 0.02 0.07 %/V Vi-Vo=3~40V Io=5~100mA, Pd< 625 mW Vi-Vo=3~40V Io=5~100 mA , Pd< 625 mW SVR Vi-Vo=40V Vi-Vo=3~13V Vi-Vo=40V B=10Hz~10KHz Tj=25 C Tj=25 C CADJ=0 f=120Hz CADJ=10mF 66 % 65 dB 80 dB (*) CADJ is connected between Adjust pin and Ground. I0 (mA) CURRENT LIMIT Tj=25 I0 (mA) C MINIMUM OPERATING CURRENT Tj=25 C 3.0 300 2.5 2.0 200 1.5 100 1.0 0.5 0 10 20 30 VIN-VOUT(V) 0 10 20 30 Contek Microelectronics Co.,Ltd. CONTEK http://www.contek-ic.com E-mail:sales@contek-ic.com VIN-VOUT(V) 3 LM317L LINEAR INTEGRATED CIRCUIT APPLICATION INFORMATION The Contek LM317L 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, giving an output voltage VO of: VO=VREF (1+R2/R1) + IADJ R2 The device is designed to minimize the term IADJ (100mA 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. The Contek LM317L is a floating regulator, input-output differential voltage , supplies of very high voltage with respect to ground can be regulated as long as the maximum input-output differential is not exceeded. Furthermore, programmable regulators are easily obtainable and, by connecting a fixed resistor between the adjustment and output, the device can be used as a precision current regulator. BASIC ADJUSTABLE REGULATOR Vi 3 Contek LM317L 1 Vo 2 Vref R1 I1 Iadj R2 Contek Microelectronics Co.,Ltd. CONTEK http://www.contek-ic.com E-mail:sales@contek-ic.com 4 LM317L LINEAR INTEGRATED CIRCUIT VOLTAGE REGULATOR WITH PROTECTION DIODES 1N4001 D1 Vi Contek LM317L 3 1 ADJ C1 Vo 2 240 W D2 R1 1N4001 C3 0.1 mF 5K W 1mF C2 10 mF R2 SLOW TURN-ON 15V REGULATOR Vi Contek LM317L 3 CURRENT REGULATOR Vo=15V 2 D1 R1 1 240 W C2 Vi 1N4001 1 2N2907 C1 Io= 25 mF Io IADJ Contek LM317L R1 240 W 1 C1 Vo=5V 2 Vref R1 + I ADJ @ 1.25V R1 DIGITALLY SELECTED OUTPUTS 5V ELECTRONIC SHUT-DOWN REGULATOR 7V to 35V R1 2 50K W R2 2.7K W 3 Contek LM317L R3 0.1 mF Vi Vo 3 Vi C2 3 Contek LM317L 2 Vo R1 240 W 1 0.1 mF 0.1 mF R2 720W 2N2219 TTL R2 INPUT DIGITAL INPUTS(R2 sets maximun Vo) Contek Microelectronics Co.,Ltd. CONTEK http://www.contek-ic.com E-mail:sales@contek-ic.com 5