UPC3018 Datasheet, PDF (3/12 Pages) NEC – LOW-SATURATION STABILIZED POWER SUPPLY WITH ON/OFF FUNCTION (1 A OUTPUT)

µPC3018, 3025
ABSOLUTE MAXIMUM RATINGS (TA = 25°C unless otherwise specified)
Parameter
Symbol
Rating
Input Voltage
VIN
–0.3 to +20
ON/OFF pin voltage
Internal Power Dissipation (TC = 25°C)
VON/OFF
PT
–0.3 to VIN +0.3 V (however, VON/OFF ≤ 20)
10^Note
Operating Ambient Temperature
TA
–30 to +85
Operating Junction Temperature
TJ
–30 to +150
Storage Temperature
Tstg
–55 to +150
Thermal Resistance (junction to case)
Rth(J-C)
12.5
Thermal Resistance (junction to ambient)
Rth(J-A)
125
Unit
V
W
°C
°C
°C
°C/W
°C/W
Note The total dissipation is limited by an internal circuit. Where TJ > 150°C, an internal protection circuit cuts off the
output.
Caution Product quality may suffer if the absolute maximum rating is exceeded even momentarily for any
parameter. That is, the absolute maximum ratings are rated values at which the product is on the verge
of suffering physical damage, and therefore the product must be used under conditions that ensure that
the absolute maximum ratings are not exceeded.
TYPICAL CONNECTION
ON/OFF
D1
INPUT
CIN
PC3018, PC3025
+
COUT
OUTPUT
D2
CIN: Must be 0.1 µF or more. Determine the capacitance in accordance with the line between the power supply
smoothing circuit and input pin. Be sure to connect this capacitor to prevent abnormal oscillation. Use of a
capacitor with excellent voltage and temperature characteristics, such as a film capacitor, is recommended. Note
that some laminated ceramic capacitors have poor temperature and voltage characteristics. When using a
laminated ceramic capacitor, the capacitance of 0.1 µF or more must be reserved in the voltage and temperature
ranges used.
COUT: Must be 10 µF or more. Be sure to connect this capacitor to prevent oscillation and to improve transient load
stability.
Connect CIN and COUT as close to the IC pins as possible (within 1 to 2 cm). Also, when using the device at 0°C or
less, use an electrolytic capacitor with low impedance characteristics.
D1: Connect a diode if the voltage on the OUTPUT pin is higher than that on the INPUT pin.
D2: Connect a Schottky barrier diode if the voltage on the OUTPUT pin is lower than that on the GND pin.
Caution Ensure that voltage is not applied to the OUTPUT pin externally.
Supply VIN and VON/OFF from different power supplies.
Design so that VIN and VON/OFF either rise at the same time or VON/OFF rises after VIN.
Data Sheet G15506EJ2V0DS
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