ROHM BP5319X, BP5319 Datasheet

BP5319 / BP5319X

Power Module

DC/DC converter for LCDs

BP5319 / BP5319X

The BP5319, BP5319X is a DC/DC converter designed for driving liquid crystal displays(LCDs).
If this module is used, a negative power supply for LCD can be made of the power supply easily 5V.

Applications

!

A power supply for the LCD panels in copiers, facsimile, personal computers, word processors, musical instrument, and
units.

Features

!

1) High accurate output voltage (-24V±0.75V).

2) High conversion efficiency (75%Typ).

3) An output voltage can be changed by the external resistor.

4) Built-in protect circuit.

5) Built-in ON/OFF switch.

6) Compact and light .

7) Available as an upright or L-shaped lead type.

Absolute maximum ratings

!

Parameter Symbol Limits Unit

Input voltage V
Output current Io 30 mA
ON/OFF control voltage V
Operating temperature Topr
Storage temperature Tstg

(Ta=25°C)

CTL

IN

7V

7V

-10∼+60

-30∼+85

°
°

C
C

Power Module

Electrical characteristics

!

Parameter

Input voltage V
Output current I
Out put voltage V
Line regulation
Load regulation
Output voltage temperature
Coefficient
Ripple noise voltage
Conversion efficiency

ON/OFF CTL voltage when OFF
ON/OFF CTL voltage when ON

ON/OFF CTL input current I

Current consumption when OFF

R1 resistance R1 50 ­R2 resistance R2 50 -

*1 Measured with a bandwidth of 20MHz.

*2 Ta = -10~60°C

(Unless otherwise noted, Ta=25°C)

Symbol

IN

OUT

OUT

∆

V1

∆

V2

∆

Vt

ν

1

η

CTL

V

CTL

V

CTL

OFF

I

Min. Typ. Max. Unit Conditions

4.5 - 5.5 V

--30mA

-24.75 -24.00 -23.25 V VIN=5V, I

--0.24V

--0.24V

--10-

--150mV

70 75 - % VIN=5V, I

2.0 - - V VIN=5V

-

-100150

--0.5mA

BP5319 / BP5319X

V
V

mV/°C

-0.5V

(Alternatively, when Open)

µ

∞
∞

k
k

V

P-P

VIN=5V, I

VIN=5V

AV

VIN=4.5∼5.5V, V

Ω

V

Ω

V

OUT

IN

=4.5∼5.5V, I

IN

OUT

=5V, I

IN

OUT

=5V, I

OUT

OUT

IN

=4.5∼5.5V, V

IN

=4.5∼5.5V, V

IN

=4.5∼5.5V, V

=25mA

OUT

=25mA

=0∼25mA

*2

=25mA

*1

=25mA
=25mA

CTL

=5V

CTL

=5V

CTL

=5V

CTL

=5V

*2

*2

*2

*2

Pin descriptions

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Pin No, Pin name Function

1 Co Output smoothing capacitor connection pin; connect a low-impedance capacitor with a

recommended capacitance of 47µF between this pin and GND.
2V
3V

OUT

ref

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.

4.7 GND Ground pin. pins 4 and 7 is internal connection.
8V

CTL

Output ON/OFF control pin; output starts when the pin is LOW level or OPEN, and stops
when the pin HIGH level.

9V

IN

Input pin; connect a low-impedance capacitor with a recommended capacitance of 100µF
between this pin and GND.