Datasheet

QS
R
C
T
I
pk
Q2
Q1
2
1
Oscillator
_
+
1.25-V
Reference
Regulator
4
5
3
8
7
6
R
SC
0.24 Ω
953 Ω
R1
C
O
1N5819
1500 pF
R2
8.2 kΩ
100 µF
+
V
CC
V
OUT
−12 V/100 mA
1.0 µH
100 µF
Optional Filter
V
IN
4.5 V to 6.0 V
+
+
1000 µF
+
L
88 µH
Comparator
V
OUT
+ *1.25 (1 )
R2
R1
)
V
IN
V
OUT
V
IN
V
OUT
8
7
6
4
3
2
1
8
7
6
4
3
2
1
5
5
a) External NPN Switch b) External PNP Saturated Switch
MC33063A
MC34063A
www.ti.com SLLS636M –DECEMBER 2004– REVISED JANUARY 2011
Figure 10. Voltage-Inverting Converter
TEST CONDITIONS RESULTS
Line regulation V
IN
= 4.5 V to 6 V, I
O
= 100 mA 3 mV ± 0.12%
Load regulation V
IN
= 5 V, I
O
= 10 mA to 100 mA 0.022 V ± 0.09%
Output ripple V
IN
= 5 V, I
O
= 100 mA 500 mV
PP
Short-circuit current V
IN
= 5 V, R
L
= 0.1 Ω 910 mA
Efficiency V
IN
= 5 V, I
O
= 100 mA 62.2%
Output ripple with optional filter V
IN
= 5 V, I
O
= 100 mA 70 mV
PP
Figure 11. External Current-Boost Connections for I
C
Peak Greater Than 1.5 A
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