7805SRH-C [MURATA]
3.3V/5V/12V Outputs High-Effi ciency Switching Regulators with LM78xx Pinouts; 3.3V / 5V / 12V输出高艾菲效率开关稳压LM78XX引脚分配
| 型号： | 7805SRH-C |
| 厂家： | 
muRata |
| 描述： | 3.3V/5V/12V Outputs High-Effi ciency Switching Regulators with LM78xx Pinouts |
| 文件： | 总6页 (文件大小：399K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
78xxSR Series
s
3.3V/5V/12V Outputs High-Efficiency
Switching Regulators with LM78xx Pinouts
Murata Power Solutions’ 7805SR-C (5V output), 7812SR-C (12V output) and 7803SR-C
(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-compat-
ible 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.
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
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 continuous 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.
ꢀ
–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
Applications in which 78SR regulators are located more than 24 inches (61cm) from
the input power supply should include an external 47uF/50V (or greater) aluminum
electrolytic capacitor, connected as close as possible to the regulator’s +Vin and
GND terminals (pins 1 and 2). An external input capacitor is particularly important if
the input voltage is applied to the regulator via a mechanical switch or relay. Contact
bounce at turn-on can produce large inductive current-spikes, and these current
spikes can generate damaging voltage transients at the regulator’s input terminals.
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.
ꢀ
Can be used with unregulated dc supplies
protection
Ordering Information
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-C
and 7803SR-C, and to 0.3A for 7812SR-C. Under no circumstances should the input
voltage be allowed to exceed 45Vdc.
MPS Part No.
Output
Voltage
Output Input
Current Voltage
Standard Pin Package
7803SR-C
7805SR-C
+3.3Vdc
+5.0Vdc
0.5A
0.5A
+7.5-36Vdc
+7.5-36Vdc
+15-36Vdc
7812SR-C
+12.0Vdc 0.4A
Horizontal Pin Package
7803SRH-C
7805SRH-C
7812SRH-C
+3.3Vdc
+5.0Vdc
0.5A
0.5A
+7.5-36Vdc
+7.5-36Vdc
+15-36Vdc
+12.0Vdc 0.4A
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MDC_78xxSR Series.B03 Page 1 of 6
78xxSR Series
3.3V/5V/12V Outputs High-Efficiency
Switching Regulators with LM78xx Pinouts
TECHNICAL NOTES (continued)
6. Soldering & Handling Precautions: All units are designed to be hand
soldered to pc-boards using no-clean solders (+260°C, 5 seconds 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.
Performance/Functional Specifications
Typical at TA = +25°C
Input/Output
Models
7803SR-C
+3.3Vdc
0.5A
7805SR-C 7812SR-C
While 78SR regulators easily withstand a 2kV ESD discharge to any ter-
minal (using human body model), they should always be treated as ESD
sensitive devices.
Output Voltage
+5.0Vdc
0.5A
+12.0Vdc
0.4A
Rated Output Current
Output Voltage Accuracy
Input Voltage Range ➀
Line Regulation (100% load)
Load Regulation (0-100% load)
Quiescent Current
Input Current
7. Horizontal-Pin Models (78XXSRH-C): 78XXSRH-C switching regulators
are pin-compatible replacements for TO-220 style LM78XX linear regula-
tors 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-C
models is electrically conductive, it must not be allowed to come in con-
tact 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 main-
tained between L1 and all exposed pc-board traces.
8. Dropout Voltage: 78SR series regulators described in this data sheet
specify a minimum input voltage at which full-load accuracy and output
regulation are guaranteed (7.5V for 7803SR-C and 7805SR-C, and 15.0V
for 7812SR-C). However, these devices will stay in regulation at lower
input voltages if they are operated at less than their rated loads.
The following dropout-voltage data, derived from sample testing
performed at an ambient temperature of +25°C with resistive loads,
should be used for information purposes only. For these tests, a unit was
considered to be out of regulation when its output changed by more
+/–0.005Vdc from its nominal value. All voltages were measured directly
at the regulator’s I/O pins.
2ꢀ
1.5ꢀ
2ꢀ
+7.5-36Vdc +7.5-36Vdc +15-36Vdc
0.3ꢀ
0.2ꢀ
0.3ꢀ
0.2ꢀ
0.3ꢀ
0.2ꢀ
3mA typ., 5mA max.
See Performance Curves
See Performance Curves
See Performance Curves
See Performance Curves
Continuous
Efficiency
Transient Response
Input & Output Noise
Short Circuit Protection ➁
Isolation
None
Overvoltage Protection
Undervoltage Protection
None
None
Environmental
Models
7803SR-C
7805SR-C 7812SR-C
–40 to +70°C
Operating Temperature
Storage Temperature
Cooling
–40 to +85°C
Free Air Convection
0 to 85ꢀ
Humidity (Non-condensing)
Physical
Mechanical
Package
Pins
See Mechanical Specifications
Open-frame SIP
0.025” (0.64mm) square,
tin-plated bronze
Typical Dropout Voltage
Weight
0.08 ounces (2.2g)
0% Load
6.0V
25% Load
6.2V
50% Load
6.2V
100% Load
6.3V
Pin Soldering
+260°C for 5 seconds
7803SR-C
7805SR-C
7812SR-C
➀ See Technical Note 5.
6.3V
6.2V
6.2V
6.8V
➁ 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.
12.8V
13.0V
12.8V
13.0V
www.murata-ps.com
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MDC_78xxSR Series.B03 Page 2 of 6
78xxSR Series
3.3V/5V/12V Outputs High-Efficiency
Typical Performance Curves TA = +25°C, VIN as indicated
Switching Regulators with LM78xx Pinouts
Noise and Ripple - 10% and 100% Load, 20MHz Bandwidth
7803SR-C
Vin = 12V, ILOAD = 50mA
7805SR-C
Vin = 12V, ILOAD = 50mA
7812SR-C
Vin = 24V, ILOAD = 40mA
7803SR-C
Vin = 12V, ILOAD = 500mA
7805SR-C
Vin = 12V, ILOAD = 500mA
7812SR-C
Vin = 24V, ILOAD = 400mA
www.murata-ps.com
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MDC_78xxSR Series.B03 Page 3 of 6
78xxSR Series
3.3V/5V/12V Outputs High-Efficiency
Switching Regulators with LM78xx Pinouts
Transient Response - 90% Load Step
7803SR-C
10% to 100% Load Step
7805SR-C
10% to 100% Load Step
7812SR-C
10% to 100% Load Step
VIN = 18V
VIN = 9V
VIN = 9V
7803SR-C
100% to 10% Load Step
7805SR-C
100% to 10% Load Step
VIN = 9V
7812SR-C
100% to 10% Load Step
VIN = 18V
VIN = 9V
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Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MDC_78xxSR Series.B03 Page 4 of 6
78xxSR Series
3.3V/5V/12V Outputs High-Efficiency
Switching Regulators with LM78xx Pinouts
Efficience Curves
7803SR-C Efficiency
7803SR-C Input Current
90
85
80
75
70
65
60
55
50
0.25
0.20
0.15
0.10
0.05
0.00
100% LOAD
50% LOAD
25% LOAD
100% LOAD
50% LOAD
25% LOAD
8
10 12 14 16 18 20 22 24 26 28 30 32 34 36
8
10 12 14 16 18 20 22 24 26 28 30 32 34 36
INPUT VOLTAGE
INPUT VOLTAGE
7805SR-C Efficiency
7805SR-C Input Current
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.00
95
90
85
80
75
70
65
60
100% LOAD
50% LOAD
100% LOAD
50% LOAD
25% LOAD
25% LOAD
8
10 12 14 16 18 20 22 24 26 28 30 32 34 36
8
10 12 14 16 18 20 22 24 26 28 30 32 34 36
INPUT VOLTAGE
INPUT VOLTAGE
7812SR-C Efficiency
7812SR-C Input Current
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.00
100
95
90
85
80
75
70
100% LOAD
100% LOAD
50% LOAD
25% LOAD
50% LOAD
25% LOAD
14
16
18
20
22
24
26
28
30
32
34
36
14
16
18
20
22
24
26
28
30
32
34
36
INPUT VOLTAGE
INPUT VOLTAGE
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Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MDC_78xxSR Series.B03 Page 5 of 6
78xxSR Series
3.3V/5V/12V Outputs High-Efficiency
Switching Regulators with LM78xx Pinouts
MECHANICAL DIMENSIONS: Inches (mm)
Standard Package
TOLERANCES: 2 PL DEC 0ꢀ02 ( 0ꢀ51)
3 PL DEC 0ꢀ010 ( 0ꢀ254)
0.41
(10.4)
0.19
(4.8)
L1
0.75
(19.1)
ꢀ
1
2
3
Pins: 0.025 (0.64) sq.
0.100 (2.54)
0.15
(3.8) Min.
centers
PC-Board Hole:
0.037 - 0.043
0.23
(0.94 - 1.09) Dia.
(5.7)
NEW
low-profile package
0.07
(1.8)
0.37
(9.3) max.
L1
1
2
3
Pins: 0.025 (0.64) sq.
0.100 (2.54)
0.15
(3.8) min.
centers
PC-Board Hole:
0.037 - 0.043
(0.94 - 1.09) Dia.
Horizontal Package
(H Pin Option)
USA:
Mansfield (MA), Tel: (508) 339-3000, email: sales@murata-ps.com
Toronto, Tel: (866) 740-1232, email: toronto@murata-ps.com
Canada:
UK:
Milton Keynes, Tel: +44 (0)1908 615232, email: mk@murata-ps.com
Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: france@murata-ps.com
München, Tel: +49 (0)89-544334-0, email: munich@murata-ps.com
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356
www.murata-ps.com email: sales@murata-ps.com ISO 9001 and 14001 REGISTERED
France:
Germany:
Japan:
Tokyo, Tel: 3-3779-1031, email: sales_tokyo@murata-ps.com
Osaka, Tel: 6-6354-2025, email: sales_osaka@murata-ps.com
03/30/09
Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other
technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply
the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without
China:
Shanghai, Tel: +86 215 027 3678, email: shanghai@murata-ps.com
Guangzhou, Tel: +86 208 221 8066, email: guangzhou@murata-ps.com
notice.
© 2008 Murata Power Solutions, Inc.
Singapore: Parkway Centre, Tel: +65 6348 9096, email: singapore@murata-ps.com
www.murata-ps.com
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MDC_78xxSR Series.B03 Page 6 of 6
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