361
Regulator ICs
Power supply unit for LCDs
BP5302 / BP5302F
The BP5302 and BP5302F are DC / DC converter units for supplying power to liquid crystal display (LCD) panels. The
ICs supply a negative voltage from a positive power supply. They are available in a single in-line package as an upright
(BP5302) or L-shaped lead (BP5302F) type.
F
Applications
LCD panels in personal computers, word processors,
copiers and facsimiles
F
Features
1) Wide input voltage range. (
)
5 to
)
14V)
2) Accurate output voltage. (
*
24
0.75V)
3) High conversion efficiency. (typically 80%)
4) Built-in protection circuit.
5) Built-in ON / OFF switch.
6) Compact and light.
7) Available as an upright or L-shaped lead type.
F
Absolute maximum ratings
362
Regulator ICs
BP5302 / BP5302F
F
Electrical characteristics (unless otherwise noted, Ta = 25
_
C and R1 and R2 resistors in the measurement circuit
F
Electrical characteristics
of Fig. 1 are disconnected)
F
Pin descriptions
363
Regulator ICs
BP5302 / BP5302F
F
Measurement circuit and application example
F
Operation notes
(1)
Place I / O external capacitors as near as possible
to the connection pins. In particular, make sure to mini-
mize the impedance between the input-side capacitor
(C1) and pin 9.
(Reference valve: A length less than 50mm is recom-
mended for a copper foil of 1.0mm wide and 35
m thick.)
(2)
Avoid frequent switching using the ON / OFF CTL
pin (5 times per second at the maximum).
(3)
R1 and R2 resistors, which are used for changing
the output voltage, are usually not required.
F
External dimensions (Units: mm)
364
Regulator ICs
BP5302 / BP5302F
F
Electrical characteristic curves
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