ROHM BA3899F Datasheet

1

Standard ICs

EL driver for portable sets

BA3899F

The BA3899F is an IC developed for EL drive applications. It uses a more compact interface than transformer sys­tems, and is ideal for use in thin sets.

•

Applications

Pagers, electronic notebooks and other portable devices

•

Block diagram

8

7

6

1 2

3

5

STBY

4

GND

N.C. C1

C2

SW1 SW2 V

CC STBY

OSC2

OSC1

R

SW2

•

Features

1) Drive oscillation frequency can be set using external capacitance.

2) Equipped with standby control pin.

•

Absolute maximum ratings (Ta = 25°C)

Parameter
Power supply voltage
Power dissipation
Operating temperature
Storage temperature

V

CC

Pd
Topr
Tstg

8.0

450

∗

– 10 ~ + 60
– 55 ~ + 125

V

Symbol Limits Unit

mW

°C
°C

Maximum applied voltage VST 8.0 V

∗

Reduced by 4.5mW for each increase in Ta of 1°C over 25°C.

•

Recommended operating conditions (Ta = 25°C)

Parameter

V

CC 1.0 5.0 7.0 V

Symbol Min. Typ. Max. Unit

Power supply voltage

2

Standard ICs BA3899F

•

Pin descriptions

V

CC

GND

C1

1k

V

CC

GND

C2

200Ω

V

CC

GND

SW2

50k

500Ω

X20X1

GND

STBY

1k

200k

50k

V

CC

GND

SW1

X5X1

Pin No.

OSC1 oscillator circuit;
external capacitor pin

OSC2 oscillator circuit;
external capacitor pin

Standby control pin
(HIGH state: standby cancelled)

SW2 switching output pin

SW1 switching output pin

䊊When applying resistance, etc.

to the STBY pin, be careful not
to exceed the threshold values.

—

—

2——N.C.

—V

CC

input pin

6I—V

CC

3 I / O —C1

4 I / O —C2

5I0STBY

7O—SW2

8O—SW1

1 I — — GND pinGND

Pin name I / O Pin voltage Internal equivalent circuit Function

3

Standard ICs BA3899F

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Electrical characteristics (unless otherwise noted, Ta = 25°C, VCC = 5.0V, C1 = 0.033µF, C2 = 1500pF)

Parameter

Symbol Min. Typ.
Supply current ICC mA When used as stand-alone unit3.0 4.6 6.2
C1 pin oscillation frequency fSW1 Hz75 95 120
C2 pin oscillation frequency fSW2 kHz17 23 29

Source current

SW1

SW2

Standby pin control
voltage condition

ISW1SO µAVC1 = 1.0V, VC2 = 0.05V, VSW1 = 0V100 140 180
Sink current ISW1SI µAVC1 = 0.05V, VC2 = 0.05V, VSW1 = 1.0V– 40 — —
Source current ISW2SO mA VC1 = 0.05V, VC2 = 0.05V, VSW2 = 0V3.2 4.4 6.1
Pull-down resistance RSW2 Ω Vst = 0.35V, VSW2 = 0.3V400 500 600

Operating VSTON V1.0 — — —

—

—

—
—

Non-operating VSTOFF V— — 0.3

Quiescent current in standby state IQ (ST) µA— 0 2.0

Max. Unit Conditions

•

Measurement circuit

2

ISW1

VSW1

fSW1

VCC

Counter

VC1

0.033µF

IQ

VSTBY

8

VC2

1500pF

± 1%

± 1%

1

ISW2

VSW2

fSW2

Counter

7

3 4

STBY

OSC2

OSC1

R

SW2

Fig.1

A A

A

6 5