LT1054 Datasheet, PDF (16/26 Pages) Linear Technology – Switched-Capacitor Voltage Converter with Regulator

LT1054
SWITCHEDĆCAPACITOR VOLTAGE CONVERTERS
WITH REGULATORS
SLVS033F − FEBRUARY 1990 − REVISED NOVEMBER 2004
APPLICATION INFORMATION
1
8
FB/SD
VCC
+
+
10 µF
VIN
2 µF
+
2
CAP+
7
OSC
3
GND
LT1054
6
VREF
4
CAP−
5
VOUT
VIN = −3.5 V to −15 V
VOUT = 2 VIN + (LT1054 Voltage Loss) + (QX Saturation Voltage)
Pin numbers shown are for the P package.
VOUT
−
QX
RX
100 µF
+
VIN
Figure 21. Negative-Voltage Doubler
+
VOUT
−
1N4001
1N4001
VIN
3.5 V to 15 V
+
100 µF
+ _{10 µF}
1
FB/SD
8
VCC
2
CAP+
7
OSC
LT1054
3
GND
6
VREF
+
2 µF
VIN = 3.5 V to 15 V
VOUT ≈ 2 VIN − (VL + 2 V _Diode)
VL = LT1054 Voltage Loss
Pin numbers shown are for the P package.
4
CAP−
5
VOUT
Figure 22. Positive-Voltage Doubler
16
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