LT1054_15 Datasheet, PDF (17/33 Pages) Linear Technology – Switched-Capacitor Voltage Converter with Regulator

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System Examples (continued)
LT1054
SLVS033G – FEBRUARY 1990 – REVISED JULY 2015
1
8
FB/SD
V_CC
+
+
10 μF
V_IN
2 μF
+
2
CAP+
7
OSC
3
GND
LT1054
6
V_REF
4
CAP−
5
V_OUT
V_IN = −3.5 V to −15 V
V_OUT = 2 V_IN + (LT1054 Voltage Loss) + (Q_X Saturation Voltage)
Pin numbers shown are for the P package.
−
Q_X
V_OUT
R_X
100 μF
+
V_IN
Figure 19. Negative-Voltage Doubler
+
V_OUT
−
1N4001
1N4001
V_IN
3.5 V to 15 V
+
100 μF
+ _{10 μF}
1
FB/SD
8
V_CC
2
CAP+
7
OSC
LT1054
3
GND
6
V_REF
+
2 μF
V_IN = 3.5 V to 15 V
V_OUT ≈ 2 V_IN − (V_L + 2 V _Diode)
V_L = LT1054 Voltage Loss
Pin numbers shown are for the P package.
4
CAP−
5
V_OUT
Figure 20. Positive-Voltage Doubler
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