•
DATA SHEET
LND317
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.
3-Terminal Adjustable Regulators
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
ADJU ST
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 Unit
Input-to-Output differential voltage, VI -V
O
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 -65 to 150 ºC
Lead temperature 1.6mm (1/16 inch) from case for 10
seconds
40 V
2W
15 W
0 to 125 ºC
260 ºC
RECOMMENDED OPERATING CONDITIONS
LND317
MIN MAX
Output current, I
O
Operating virtual junction temperature, T
J
10 1500 mA
0 125 ºC
TYPICAL APPLICATION DATA
V
V
IN
IN
LND317
Adjust
C1
0.1µF
(see note A)
V
OUT
R2
R1
240
C2
µ
1
F
(see note B)
UNIT
V
OUT
REF
1 +
R2
R1
+ I
R2
Adj
V
= V
OUT
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
•
ELECTRICAL CHARACTERISTICS
Over recommended ranges of operating virtual junction temperature (unless otherwise noted) (see Note 1)
LND317
PARAMETER TEST CONDITIONS
= 3V to 40V,
V
Input regulation( See Note 2)
I-VO
(See Note 3)
TJ=MIN to
MAX
I
=10mA to
O
1.5A
LM317
MIN TYP MAX
0.01 0.04
0.02 0.07
UNIT
% / V
VO=10 V, f=120 Hz 65
Ripple rejection
O
10-µF capacitor between ADJ and
66 80
dB
=10 V, f=120 Hz
V
ground
Output Regulation
IO=10mA to 1.5 A,
=25ºC,(See Note3)
T
J
=10mA to 1.5A,
I
O
(see note 3)
Output Voltage Change with
temperature
Output voltage long-term
drift(see note 4)
T
=MIN to MAX 1 %
J
After 1000h at T
=40V
V
I-VO
=MAX and
J
Output noise voltage f = 10Hz to 10kHz, T
Minimum output current to
maintain regulation
Peak output current
V
I -VO =
V
I -VO ≤
V
I -VO ≤
40V 3.5 10 mA
15V
40V, TJ =25ºC
≤ 5V
V
O
V
> 5V 0.1 0.5 %
O
≤ 5V
V
O
> 5V
V
O
25ºC 0.003 %
J=
1.5 2.2
0.15 0.4
525 mV
20 70 mV
0.3 1.5 %
0.3 1 %
A
Adjustment terminal current 50 100 µA
V
Change in adjustmentterminal current
Reference voltage(output to
ADJ)
=2.5V to 40V,
I-VO
I
=10mA to 1.5A
O
V
3V to 40V, IO =10mA to 1.5A,
I -VO =
P≤15W
0.2 5.0 µA
1.2 1.25 1.3 V
Unless otherwise noted, these specifications apply for the following test conditions: V
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 •
I -VO=
5V and I
0.5A. For conditions shown as
O=
www.lineardimensions.com
•
TYPICAL APPLICATIONS
D1
LND317
V
IN
D1 prot ect s against C1
D2 prot ect s against C2
Regulator with Protection Diodes
V
IN
+ I
)
<= 1.5 A
R1
Adj
V
IN
LND317
Adjust
V
OUT
D2
R1
240
+
R2
C2
µ
F
10
V
OUT
C1
V
IN
V
IN
LND317
Adjust
I
I
=
OUT
=
10 mA <=I
V
OUT
Adj
(
1.25 V
V
R1
REF
R1
OUT
I
OUT
Current Regulator
V
IN
LND317
Adjust
V
OUT
24
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
•
Loading...