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SLLS636L – DECEMBER 2004 – REVISED DECEMBER 2009
8
1
S Q
R
7
Q2
Q1
2
L
88
µH
C
T
3
1.25-V
Reference
Regulator
1N5819
+
1500 pF
4
1.0
µH
V
OUT
−12 V/100 mA
C
O
1000
µF
100
µF
+
+
V
OUT
+ *
1.25 (1
)
R2)
R1
R
SC
0.24
Ω
V
IN
4.5 V to 6.0 V
+
100
µF
5
6
V
CC
I
pk
Oscillator
+
_ Comparator
R1
R2
8.2 kΩ
953
Ω
Optional Filter
Figure 10. Voltage-Inverting Converter
TEST
Line regulation
Load regulation
Output ripple
Short-circuit current
Efficiency
Output ripple with optional filter
CONDITIONS
V
IN
= 4.5 V to 6 V, I
O
= 100 mA
V
IN
= 5 V, I
O
= 10 mA to 100 mA
V
IN
= 5 V, I
O
= 100 mA
V
IN
= 5 V, R
L
= 0.1
Ω
V
IN
= 5 V, I
O
= 100 mA
V
IN
= 5 V, I
O
= 100 mA
RESULTS
3 mV ± 0.12%
0.022 V ± 0.09%
500 mV
PP
910 mA
62.2%
70 mV
PP
8
1
8
1
V
OUT
7
2
V
OUT
3
V
IN
7
2
V
IN
6
6
3
5
4
a) External NPN Switch
5
4
b) External PNP Saturated Switch
Figure 11. External Current-Boost Connections for I
C
Peak Greater Than 1.5 A
Copyright © 2004–2009, Texas Instruments Incorporated
9
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