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LM7803SR Datasheet Preview

LM7803SR Datasheet

High-Efficiency Switching Regulators

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www.DataSheet.co.kr
NEW
low-profile package
Order online at www.datel.com
Features
3.3V/0.5A, 5V/0.5A or 12V/0.4A outputs; Pin and size-compatible
with LM7805 & LM7812 regulators
Up to 95% efficiency – no heat sinks or thermal derating required!
Two SIP-packages fit existing TO-220 footprints:
Vertical-pin models occupy less than 0.1 square in.
Optional horizontal pins provide 0.350 in. installed height
+7.5-36Vdc operating input range; Low 3mA quiescent current
Built-in filter capacitors – no external components required
–40 to +70°C operation at full load; Short-circuit protection
Excellent load (±0.2%) and line (±0.3%) regulation
Ideal for powering instrumentation from 9V/12V/24V/28V
supplies or batteries
Can be used with unregulated dc supplies
®®
A SUBSIDIARY OF C&D TECHNOLOGIES
78SR Series
3.3V/5V/12V Outputs
High-Efficiency Switching
Regulators with LM78XX Pinouts
DATEL’s 7805SR (5V output), 7812SR (12V output) and
7803SR (3.3V output) step-down switching regulators are
modern drop-in replacements for older, inefficient, LM7805 and
LM7812 linear regulators. The 78XXSR's are pin- and size-
compatible with industry-standard TO-220 SIP packages. A
260kHz switching frequency provides for efficiencies as high as
95%. Full-load (up to 0.5A) operation from 9V, 12V, 24V, or 36V
supplies at ambient temperatures up to +70°C requires no heat
sinks, no temperature derating, no forced-air cooling, and no
external capacitors.
78SR switching regulators provide many significant
improvements over their linear counterparts: lower quiescent
current (3mA vs. 5 mA), higher input voltage (40V vs. 32V),
and better output accuracy (±1.5% vs. ±5%). All these features
combine to make 78SR regulators ideal for new or existing
LM7805 & LM7812 applications requiring full-load operation at
elevated voltages.
Technical Notes
1. Input/Output (I/O) Filtering: As shown in the noise and ripple graphs,
78SR switching regulators exhibit excellent low-noise performance with
no external I/O capacitors. However, if additional noise reduction is
required, be sure to use low-ESR capacitors that are rated for continu-
ous operation (with an additional 20% safety margin) at the highest
system voltages and temperatures. Adding external output capacitors
will also improve the unit’s load-transient response.
2. Input Fusing: 78SR switching regulators are not internally fused. If
fusing their input and/or output terminals is required, use the data
shown in the Efficiency Curves as a guide to selecting an appropriate
slow-blow fuse.
3. Input-Output Isolation: 78SR regulators’ internal input and output
circuits share a common connection (GND, pin 2); there is no electrical
isolation between the INPUT (pin 1) and OUTPUT (pin 3) terminals.
4. Overvoltage Protection: 78SR switching regulators do not provide
input or output overvoltage protection. In the extremely rare situation
in which a catastrophic failure occurs, the output voltage may rise
to excessively high levels. If your load must be protected against
all possible overvoltage situations, external voltage-limiting circuitry
must be provided.
5. Operation at 40Vdc: Operating with inputs up to 40Vdc is permissible
if, for inputs between 36 and 40Vdc, the maximum load current is
reduced to 0.35A for 7805SR and 7803SR, and to 0.3A for 7812SR.
Under no circumstances should the input voltage be allowed to
exceed 45Vdc.
6. Soldering & Handling Precautions: All units are designed to be
hand soldered to pc-boards using no-clean solders (+260°C, 5 sec-
onds max.). Water-soluble solders can also be used, but the units
must be washed and dried using processes appropriate to the type of
solder employed. See the Mechanical Specifications section for pin 1
orientation and recommended plated-through hole dimensions.
While 78SR regulators easily withstand a 2kV ESD discharge to any
terminal (using human body model), they should always be treated as
ESD sensitive devices.
7. Horizontal-Pin Models (78XXSRH): 78XXSRH switching regulators
are pin-compatible replacements for TO-220 style LM78XX linear reg-
ulators that are installed with their metal tabs lying flat on the surface
of the pc-board. However, because the surface of inductor L1 on
78XXSRH models is electrically conductive, it must not be allowed to
come in contact with any exposed pc-board traces, other than power
ground (GND).
While the 2-mil-thick (0.05mm) polyester label attached to L1 provides
some degree of electrical insulation (only if L1 sits perfectly flat on
the pc-board), it is recommended that a 0.020” (0.5mm) clearance be
maintained between L1 and all exposed pc-board traces.
DATEL, Inc., Mansfield, MA 02048 (USA) Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356 E–mail: sales@datel.com Internet: www.datel.com
Datasheet pdf - http://www.DataSheet4U.net/




Datel

LM7803SR Datasheet Preview

LM7803SR Datasheet

High-Efficiency Switching Regulators

No Preview Available !

www.DataSheet.co.kr
78SR Series
HIGH-EFFICIENCY SWITCHING REGULATORS
Performance/Functional Specifications
Typical at TA = +25°C
Input/Output
Models
Output Voltage
Rated Output Current
Output Voltage Accuracy
Input Voltage Range
Line Regulation (100% load)
Load Regulation (0-100% load)
Quiescent Current
Input Current
Efficiency
Transient Response
Input & Output Noise
Short Circuit Protection
Isolation
Overvoltage Protection
Undervoltage Protection
7803SR
7805SR 7812SR
+3.3Vdc
+5.0Vdc +12.0Vdc
0.5A 0.5A 0.4A
±2%
±1.5%
±2%
+7.5-36Vdc +7.5-36Vdc +15-36Vdc
±0.3%
±0.3%
±0.3%
±0.2%
±0.2%
±0.2%
3mA typ., 5mA max.
See Performance Curves
See Performance Curves
See Performance Curves
See Performance Curves
Continuous
None
None
None
Environmental
Models
Operating Temperature
Storage Temperature
Cooling
Humidity (Non-condensing)
Physical
Mechanical
Package
Pins
Weight
Pin Soldering
7803SR
7805SR 7812SR
–40 to +70°C
–40 to +85°C
Free Air Convection
0 to 85%
See Mechanical Specifications
Open-frame SIP
0.025” (0.64mm) square,
tin-plated bronze
0.08 ounces (2.2g)
+260°C for 5 seconds
See Technical Note 5.
While these regulators can withstand a continuous short-circuit across their
output terminals, they will experience a significant temperature rise. Extended
short-circuit operation will adversely affect the unit’s reliability.
Typical Performance Curves TA = +25°C, VIN as indicated
Noise and Ripple - 10% and 100% Load, 20MHz Bandwidth
7803SR Vin = 12V, ILOAD = 50mA
7805SR Vin = 12V, ILOAD = 50mA
7812SR
Vin = 24V, ILOAD = 40mA
7803SR Vin = 12V, ILOAD = 500mA
7805SR Vin = 12V, ILOAD = 500mA
7812SR Vin = 24V, ILOAD = 400mA
DATEL, Inc., Mansfield, MA 02048 (USA) Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356 E–mail: sales@datel.com Internet: www.datel.com
2
Datasheet pdf - http://www.DataSheet4U.net/


Part Number LM7803SR
Description High-Efficiency Switching Regulators
Maker Datel
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LM7803SR Datasheet PDF






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