• DATA SHEET LND317 3-Terminal Adjustable Regulators GENERAL DESCRIPTION The LND317 is an adjustable 3-terminal positivevoltage regulator capable of supplying 1.5A over a differential voltage range of 3V to 40V. It is exceptionally easy to use and requires only two external resistors to set the output voltage. Both input and output regulation is better than standard fixed regulators. In addition to higher performance than fixed regulators, the LND317 has full overload protection available only in integrated circuits. Included on the chip are current limit, thermal overload protection, and safe-area protection. All overload protection circuitry remains fully functional even if the adjustment terminal is disconnected. Normally, no capacitors are needed unless the device is situated far from the input filter capacitors in which case an input bypass is needed. An optional output capacitor can be added to improve transient response. The primary applications of this device is that of a programmable output regulator, but by connecting a fixed resistor between adjustment terminal and the output terminal, the device can be used as a precision current regulator. Even though the regulator is floating and sees only the input-to output differential voltage, use of these devices to regulate output voltages that would cause the maximum-rated differential voltage to be exceeded if the output became shorted to ground is not recommended. FEATURES • Output Voltage Range Adjustable from 1.2V to 37V • Output Current Capability of 1.5A Max • Input Regulation Typically 0.01% per Input-Volt Change • Output Regulation Typically 0.1% • Peak Output Current Constant Over Temperature Range of Regulator • Popular 3-Lead TO-220 Package • Ripple Rejection Typically 80 dB • Direct Replacement for National LM317 INPUT OUTPUT ADJUST TO-220 (Top View) • Linear Dimensions, Inc. • 445 East Ohio Street, Chicago IL 60611 USA • tel 312.321.1810 • fax 312.321.1830 • www.lineardimensions.com • LM317 ABSOLUTE MAXIMUM RATING (unless otherwise noted) Input-to-Output differential voltage, VI -VO Continuous total dissipation at 25ºC free-air temperature Continuous total dissipation at (or below) at 25ºC case temperature Operating free-air, case, or virtual junction temperature range Storage temperature range Lead temperature 1.6mm (1/16 inch) from case for 10 seconds LND317 Unit 40 V 2 W 15 W 0 to 125 ºC -65 to 150 ºC 260 ºC RECOMMENDED OPERATING CONDITIONS LND317 MIN MAX 10 0 1500 125 Output current, IO Operating virtual junction temperature, TJ UNIT mA ºC TYPICAL APPLICATION DATA VIN VOUT VIN VOUT LND317 R1 240 Adjust C1 0.1µF C2 R2 (see note A) V OUT = V REF ( ) R2 1+ R1 1 µF (see note B) + IAdj R2 Note A: Use of an Input Bypass Capacitor is recommended if regulator is far from filter capacitors Note B: Use of an output capacitor improves transient response, but is optional. • Linear Dimensions, Inc. • 445 East Ohio Street, Chicago IL 60611 USA • tel 312.321.1810 • fax 312.321.1830 • www.lineardimensions.com • LND317 ELECTRICAL CHARACTERISTICS Over recommended ranges of operating virtual junction temperature (unless otherwise noted) (see Note 1) PARAMETER TEST CONDITIONS Input regulation( See Note 2) VI-VO= 3V to 40V, (See Note 3) MIN TJ=MIN to MAX 0.01 IO =10mA to 1.5A 0.02 Output Regulation Output Voltage Change with temperature Output voltage long-term drift(see note 4) Output noise voltage Minimum output current to maintain regulation Peak output current Adjustment terminal current Change in adjustmentterminal current Reference voltage(output to ADJ) 0.04 0.07 65 VO=10 V, f=120 Hz 10-µF capacitor between ADJ and ground IO=10mA to 1.5 A, VO ≤ 5V TJ =25ºC,(See Note3) VO > 5V IO =10mA to 1.5A, (see note 3) UNIT %/V VO=10 V, f=120 Hz Ripple rejection LM317 TYP MAX 66 dB 80 VO ≤ 5V 5 0.1 20 25 0.5 70 mV % mV VO > 5V 0.3 1.5 % TJ =MIN to MAX 1 After 1000h at TJ =MAX and VI-VO=40V f = 10Hz to 10kHz, TJ= 25ºC 0.3 VI-VO =2.5V to 40V, IO=10mA to 1.5A VI -VO = 3V to 40V, IO =10mA to 1.5A, P≤15W 1 0.003 VI -VO = 40V VI -VO ≤ 15V VI -VO ≤ 40V, TJ =25ºC % 3.5 1.5 0.15 1.2 % % 10 mA 2.2 0.4 50 100 µA 0.2 5.0 µA 1.25 1.3 V A Unless otherwise noted, these specifications apply for the following test conditions: VI -VO=5V and IO= 0.5A. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions. Notes: 1. All characteristics are measured with a 0.1-µF capacitor across the input and a 1-µF capacitor across the output. 2. Input regulation is expressed here as the percentage change in output voltage per 1-V change at the input. 3. Pulse testing techniques are used to maintain the junction temperature as close to the ambient temperature as possible. Thermal effects must be taken into account separately. 4. Since long-term drift cannot be measured on the individual devices prior to shipment, this specification is not intended to be a guarantee or warranty. It is an engineering estimate of the average drift to be expected from lot to lot. • Linear Dimensions, Inc. • 445 East Ohio Street, Chicago IL 60611 USA • tel 312.321.1810 • fax 312.321.1830 • www.lineardimensions.com • LND317 TYPICAL APPLICATIONS D1 VOUT VIN VIN VOUT LND317 C1 I Adj 10 µ F I OUT = ( ) VREF R1 + IAdj = 1.25 V R1 D1 protects against C1 D2 protects against C2 10 mA <=I OUT<= 1.5 A Current Regulator Regulator with Protection Diodes VIN I OUT Adjust + C2 R2 R1 VOUT VIN LND317 D2 R1 240 Adjust VIN VOUT VIN 24 LND317 Adjust 50 mA Constant Current Battery Charger • Linear Dimensions, Inc. • 445 East Ohio Street, Chicago IL 60611 USA • tel 312.321.1810 • fax 312.321.1830 • www.lineardimensions.com •