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PDF TA8198F Data sheet ( Hoja de datos )

Número de pieza TA8198F
Descripción DC/DC CONVERTER FOR ELECTRIC TUNING
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TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic
TA8198F
DC / DC Converter For Electric Tuning (3V USE)
The TA8198F is a DC / DC converter IC which is developed for
biasing varactor diodes of tuner system.
It is especially suitable for supplying high voltage (about 15.5V)
for digital tuning (FM / TV / AM) system of headphone stereos,
radio cassette recorders, or other equipments.
Features
· Few external parts.
· Excellent spurious radiation by oscillation of sine wave.
· Builtin constant current source, it is suitable for digital
tuning system. (ICTL can be controlled by RCTL)
· Output voltage VO = 15.5V (typ.)
Weight: 0.09g (typ.)
· Excellent regulatory capability of output voltage against
fluctuation of supply voltage, and of ambient temperature.
· Builtin power switch
· Low supply current (at nonload, VCC = 3V, Ta = 25°C) ICCQ = 2.4mA (typ.)
· Operating supply voltage range (Ta = 25°C) VCC (opr) = 1.8~10V
Block Diagram
TA8198F
Handle with care to prevent devices from deterioration by static electricity.
1 2002-10-30

1 page




TA8198F pdf
TA8198F
Electrical Characteristics
(unless otherwise specified: VCC=3V, fOSC=3MHz, IO=100µA, Ta=25°C, SW1: a, SW2: OPEN)
Characteristic
Quiescent supply current
Boosted output voltage
VO supply voltage fluctuation
VO maximum output current
VO ambient temperature
coefficient
Constant current source
output current
ICTL maximum current
Power switch on current
Power switch off voltage
Symbol
ICCQ1
ICCQ2
VO
VO
IO (MAX)
VO / T
ICTL
ICTL(MAX)
ION
VOFF
Test
Cir-
cuit
Test Condition
PW OFF, SW1: d
IO = 0
VCC = 1.8~10V
VO = 30mV (with respect
to standard IO = 100µA)
IO = 0, V3 = 10V
SW2: ON (RCTL = 820)
IO = 0, V3 = 10V
SW2: On (RCTL = 0)
VO = 30mV (with respect
to standard ICTL = 100µA)
SW1: b
VCC =1.8V VO 13V
SW1: c
VO 3.5V
Min.
14.5
-20
300
85
Typ.
2.4
15.5
0
±0.3
110
200
Max.
5
4.0
16.5
+20
Unit
µA
mA
V
mV
µA
mV / °C
140
µA
5 ― ― µA
0 0.7
Test Circuit
Coil Data (test circuit)
Test
Frequency
3MHz
L (µH) Q0
2-6
103 40
C0 (pF)
Turn
4-6 1-2 2-3 1-6
Wire
(mmf)
Reference
22
7
2
57
1
2
0.1UEW (S)4143-3099-356
(S): SUMIDA ELECTRIC & Co.,Ltd.
5 2002-10-30

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