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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) LND317 Input-to-Output differential voltage, VI -VO Continuous total dissipation at 25C free-air temperature Continuous total dissipation at (or below) at 25C 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 40 2 15 0 to 125 -65 to 150 260 Unit V W W C C C
RECOMMENDED OPERATING CONDITIONS
LND317 MIN Output current, IO Operating virtual junction temperature, TJ 10 0 MAX 1500 125
UNIT mA C
TYPICAL APPLICATION DATA
VIN VIN VOUT VOUT
LND317
Adjust
R1 240
C1 0.1F (see note A)
C2 R2 1 F (see note B)
V OUT = V
REF
()
R2 1+ R1
+ 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 TJ=MIN to MAX IO =10mA to 1.5A
MIN
LM317 TYP MAX 0.01 0.02 65 0.04
UNIT
Input regulation( See Note 2)
VI-VO= 3V to 40V, (See Note 3) VO=10 V, f=120 Hz
%/V 0.07
Ripple rejection Output Regulation
VO=10 V, f=120 Hz 10-F capacitor between ADJ and ground IO=10mA to 1.5 A, VO 5V TJ =25C,(See Note3) VO > 5V IO =10mA to 1.5A, (see note 3) VO 5V VO > 5V
66
80 5 0.1 20 0.3 1 0.3 0.003 3.5 10 1 25 0.5 70 1.5
dB mV % mV % % % % mA A 100 5.0 1.3 A A V
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)
TJ =MIN to MAX After 1000h at TJ =MAX and VI-VO=40V f = 10Hz to 10kHz, TJ= 25C VI -VO = 40V VI -VO 15V VI -VO 40V, TJ =25C VI-VO =2.5V to 40V, IO=10mA to 1.5A VI -VO = 3V to 40V, IO =10mA to 1.5A, P15W 1.5 0.15
2.2 0.4 50 0.2
1.2
1.25
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-F capacitor across the input and a 1-F 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
VIN
VIN
VOUT
VOUT D2 R1 240
VIN
VIN
VOUT
R1
I OUT
LND317
Adjust
LND317
Adjust
R2
+ C2 10 F
C1
I Adj
I OUT =
()
VREF R1
+ IAdj
D1 protects against C1 D2 protects against C2
= 1.25 V R1 10 mA <=I OUT<= 1.5 A
Regulator with Protection Diodes
Current Regulator
VIN
VIN
VOUT
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 *

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