BP5302A 查看數據表（PDF） - ROHM Semiconductor

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BP5302A

DC / DC converter for LCDs

ROHM Semiconductor 

BP5302A / BP5302XA

Pin descriptions

Pin No. Pin name

1

CO

2

VOUT

3

Vref

4, 7

GND

8

VCTL

9

VIN

Function

Output smoothing capacitor connection pin; connect a low-

impedance capacitor with a recommended capacitance of 47µF

between this pin and GND

Output pin

Output voltage adjustment pin for contrast; output voltage is

adjusted by connecting a resistor between pins 2 and 3 or pins

3 and 4

Ground pin

Output ON / OFF control pin; output starts when the pin is

HIGH level, and stops when the pin is LOW or OPEN

Input pin; connect a low-impedance capacitor with a

recommended capacitance of 100µF between this pin and GND

Measurement circuit and Application example

BP5302A / BP5302XA

1

2

3

4

VOUT

(R1)

(R2)

7

8

ON / OFF

SW

9

Be sure to use

fuse for safety

VIN

C2

+

VCTL

+

C1

GND

GND

Fig.1

C1 : 100µF / 16V (Low impedance)

C2 : 47µF / 35V (Low impedance)

R1, R2 : Resistors for adjusting output voltage

(Disconnected during test measurement)

Operation notes

(1) Place I/O external capacitors as near as possible to the connection pins. In particular, make sure to

minimize the impedance between the input-side capacitor (C1) and pin 9. (Reference value: A length less

than 50mm is recommended for a copper foil of 1.0mm wide and 35µF 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.

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