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LC78_3.0 Cost effective Series
Wide Input, Non-Isolated & Regulated, Single Output
Switching Regulator
High performance switching
regulator
Low profile
(L*W*H=11.6*7.5*10.2)
Wide 4.5V to 28V input
High efficiency up to 95%
Compatible with LM78
pin-out
Short circuit protection (SCP)
Low output ripple & noise
voltage range
RoHS
Common specifications
Short circut protection: Continuous, automatic recovery
Temperature rise at full load: 40°C MAX
Cooling: Free air convection
Operation temperature range: -40°C~+85°C (with derating)
Storage temperature range: -55°C ~+125°C
Lead temperature: 300°C MAX, 1.5mm from case for 10 sec
Operating case temperature: 110°C MAX
Case thermal impendance: 70°C/W
Temperature coefficient: -40°C to +85°C ambient
Storage humidity range: < 95%
MTBF (using MIL-HDBK-217F): +25°C 1680x103 hours
Packing quantities: 42pcs per Tube
Case material: Non Conductive Black Plastic UL94-V0
Potting material: Epoxy UL94-V0
Soldering profile: 265°C/10sec. MAX
Weight: 2.3g
0.02%/°C MAX
+60°C 786x103 hours
The LC78_3.0 series cost effective high efficiency switching regulators
are ideally suited to replace LM78xx linear regulators and are pin
compatible.
Model selection:
LC78_yy-pp
LC=Series; yy=Vout; pp=output current
Example:
LC78_05-3.0
LC=Series; ##= 5Vout; pp=3.0A
Output specifications
Item Test conditions Min Typ Max Units
Output voltage
accuracy
Output current 0 3.0 A
Output current limit 5.0 A
Internal power
dissipation
Line regulation Vin= min. to max. at
Load regulation 10% to 100% load 40 mV
Ripple + Noise 20MHz Bandwidth 150 mVp-p
Dynamic load
stability
Switching frequency 150 KHz
No load input
current
Thermal shutdown Internal IC junction 150 °C
Max capacitance
load
full load ±3 %
0.9 W
full load
100%<->50% load
(50mA/uS)
50 mV
±50 mV
250 uA
220 μF
Note:
1. All specifications measured at TA=25°C, humidity<75%, nominal input voltage
and rated output load unless otherwise specified.
2. Only typical models listed. If you need other model, please confirm the power,
input voltage and output voltage, and then phone us.
Part Number Input Voltage
Range [VDC]
LC78_1.8-3.0 4.5-28 1.8 3.0 87 84 220
LC78_2.5-3.0 4.5-28 2.5 3.0 90 87 220
LC78_03-3.0 4.5-28 3.3 3.0 93 90 220
LC78_05-3.0 6.5-28 5 3.0 95 92 220
Output Voltage
[VDC]
Output Current
[A]
Efficiency
[Vin. min]
Efficiency
[Vin. max]
Capacitive load
[uF; max]
GAPTEC-Electronic GmbH & Co. KG
sales@gaptec-electronic.com – www.gaptec-electronic.com
Specifications subject to change without notice.
LC78_3.0 – Rev. 2013-1.1
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LC78_3.0 Cost effective Series
Wide Input Non-Isolated & Regulated, Single Output
Typical characteristics
Derating Graph (Natural convection)
Standard application circuit
Efficiency Vs Vin (Full Load)
Mechanical dimensions
Front view
Right
view
Tube outline dimensions
Top view
Tolerance:
XX.X ± 0.25 mm
XX.XX ± 0.15 mm
Note:
L=520 ± 2 mm
Devices per tube quantity: 42 PCS
GAPTEC-Electronic GmbH & Co. KG
sales@gaptec-electronic.com – www.gaptec-electronic.com
LC78_3.0 – Rev. 2013-1.1
Page 2 of 2
Specifications subject to change without notice.
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