LSR7810
Series
Low Cost, Miniature
1.0A Surface Mount
POL Switching Regulators
Electrical Specifications
Specifications typical @ +25°C, nominal input voltage & rated output current, unless otherwise noted. Specifications subject to change without notice.
Output
Key Features:
•
Efficiency to 93%
•
1.0A Output Current
•
Compact SMT Case
•
LM78xx Replacement
•
Wide Input Range
•
Remote ON/OFF Control
•
Adjustable Output Voltage
•
Short Circuit Protected
•
Thermal Shutdown
•
Low Noise
•
Low Low Cost
Parameter
Output Voltage Accuracy
Output Voltage Adjustment Range
Line Regulation
Load Regulation
Ripple & Noise (20 MHz)
Thermal Shutdown
Temperature Coefficient
Maximum Capacitive Load
Output Current Limit
Output Short Circuit
Typ.
±2.0
Contact Factory For Information
V
IN
= Min to Max
±0.2
I
OUT
= 10% to 100%
±0.4
20
See Output Filter Circuit (Page 2)
10
See Note 1
150
Conditions
Min.
Max.
±3.0
±0.5
±1.0
35
15
0.02
1,000
Units
%
%
%
mV P - P
°C
%/°C
µF
A
1.8
Hiccup Mode, Continuous (Autorecovery)
Conditions
Min.
Not Isolated
Typ.
1.40
Conditions
Min.
1.2
Typ.
Max.
6.0
0.6
200
200
Max.
General
Parameter
Isolation Voltage
Switching Frequency
Units
MHz
Units
VDC
VDC
µA
µA
Remote On/Off
Parameter
Supply On
Supply Off
ON/OFF Control Current
Standby Input Current
See Note 2
100
120
Conditions
Min.
-40
Typ.
+25
Environmental
Parameter
Operating Temperature Range
Operating Temperature Range
Storage Temperature Range
Lead Temperature
Derating
Cooling
Humidity
Max.
Units
+85
°C
+100
°C
-55
+125
°C
1.5 mm From Case For 10 Sec
260
°C
Over 71°C, derate output power 2.85%/°C to 60% at 85°C
Free Air Convection
RH, Non-condensing
95
%
Ambient
Case
See Mechanical Diagram (Page 2)
Non-Conductive Black Plastic (UL-94V0)
0.08 Oz (2.3g)
Conditions
MIL HDBK 217F, 25°C, Gnd Benign
Min.
1.0
Typ.
Max.
Units
MHours
Physical
Case Size
Case Material
Weight
Reliability Specifications
Parameter
MTBF
Characteristic Curves
MicroPower Direct
292 Page Street
Suite D
Stoughton, MA 02072
USA
T:
(781) 344-8226
F:
(781) 344-8481
E:
sales@micropowerdirect.com
W:
www.micropowerdirect.com
Efficiency vs Load (V
IN
=Nom)
Ripple vs Load (V
IN
= Nom)
www.micropowerdirect.com
Model Selection Guide
Model
Number
LSR7810-015W
LSR7810-018W
LSR7810-02W
LSR7810-03W
LSR7810-05W
LSR7810-06W
Input
Voltage
(VDC)
Nom.
Range
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Current
(mA)
Output
Voltage
(VDC)
Nom.
Adj Range
Efficiency
(%, Max)
Current
(A)
Min V
IN
76
79
83
84
90
93
Max V
IN
74
77
81
84
88
91
12
12
12
12
12
12
4.75 - 15.0
4.75 - 15.0
5.0 - 18.0
5.0 - 18.0
7.0 - 18.0
8.5 - 18.0
165
190
245
320
460
580
1.5
1.8
2.5
3.3
5.0
6.5
Fixed
1.5 - 3.6
1.5 - 3.9
1.8 - 5.5
2.5 - 6.5
Fixed
1.0
1.0
1.0
1.0
1.0
1.0
Notes:
1. Measured at an internal IC junction.
2. If the control pin (pin 10) is left open, the unit operates. If the
control pin is grounded, the unit is off.
3. This regulator is not designed to be used in parallel with another
unit to increase output power.
4. The input should not exceed the range given in the model
selection chart. Exceeding this limit could damage the unit.
5. If the output voltage is adjusted, the input/output relationship
must meet: V
IN
- V
OUT
= >2V. Attempting to operate below this
differential could damage the unit.
Derating Curve
Typical Application Circuits
The figure at above shows a typical connection of the LSR7810. Some notes on this connection are:
1. C
1
& C
2
are low ESR ceramic capacitors used to minimize noise at the regulator. A tantalum or low ESR
electrolytic capacitor may also be used. These capacitors are required and should be mounted as close
to the regulator pins as possible.
2. R
1
& R
2
are used to adjust the regulator output. If this is not required, the V
ADJ
pin (pin 6) should be connected
to ground through 470 pF ceramic capacitor. For more information on adjusting the output, please contact
the factory.
3. A simple LC network may be used to improve the output ripple of the unit. This is illustrated by L
OUT
and C
OUT
.
Mechanical Dimensions
Pin Connection
Pin Function
1
+V
IN
5
+V
OUT
6
V
ADJ
Pin Function
7
Gnd
9
Gnd
10
Control
Solder Layout
MicroPower Direct
We Power Your Success - For Less!
292 Page Street Ste D Stoughton, MA 02072
•
Notes:
•
All dimensions are typical in inches (mm)
•
Tolerance x.xx = ±0.02 (±0.50)
•
Pin 1 is marked by a “dot” or indentation on the side of the unit
FAX: (781) 344-8481
•
TEL: (781) 344-8226
•
E-Mail: sales@micropowerdirect.com
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