CMOS Monolithic Voltage Converter
OUTPUT CURRENT vs. CAPACITANCE:
V
IN
= +4.5V, V
OUT
= -4V
CURRENT (mA)
100
CURRENT (mA)
80
60
40
20
0
0.33 1.0 2.0 2.2 4.7 10 22 47 100 220
CAPACITANCE (µF)
FC = V+
OSC = OPEN
MAX660 CHART -01
200
150
100
50
0
FC = V+
OSC = OPEN
0.33 1.0 2.0 2.2 4.7 10 22 47 100 220
CAPACITANCE (µF)
MAX660 CHART -03
50
CURRENT (mA)
40
30
20
10
0
FC = V+
OSC = OPEN
100
CURRENT (mA)
80
60
40
20
0
FC = V+
OSC = OPEN
0.33 1.0 2.0 2.2 4.7 10 22 47 100 220
CAPACITANCE (µF)
0.33 1.0 2.0 2.2 4.7 10 22 47 100 220
CAPACITANCE (µF)
______________________________________________________________Pin Description
NAME
PIN
NAME
INVERTER
Frequency Control for internal oscillator, FC = open,
f
OSC
= 10kHz typ; FC = V+, f
OSC
= 80kHz typ (40kHz min),
FC has no effect when OSC pin is driven externally.
Charge-Pump Capacitor, Positive Terminal
Power-Supply Ground Input
Charge-Pump Capacitor, Negative Terminal
Output, Negative Voltage
Low-Voltage Operation Input. Tie LV to GND when input
voltage is less than 3V. Above 3V, LV may be connected to
GND or left open; when overdriving OSC, LV must be
connected to GND.
Oscillator Control Input. OSC is connected to an internal
15pF capacitor. An external capacitor can be added to slow
the oscillator. Take care to minimize stray capacitance. An
external oscillator may also be connected to overdrive OSC.
Power-Supply Positive Voltage Input
FUNCTION
DOUBLER
1
2
3
4
5
FC
CAP+
GND
CAP-
OUT
Same as Inverter
Same as Inverter
Power-Supply Positive Voltage Input
Same as Inverter
Power-Supply Ground Input
6
LV
LV must be tied to OUT for all input
voltages.
7
OSC
Same as Inverter; however, do not over-
drive OSC in voltage-doubling mode.
8
V+
Positive Voltage Output
5
_______________________________________________________________________________________
MAX660 CHART -04
60
OUTPUT CURRENT vs. CAPACITANCE:
V
IN
= +3.0V, V
OUT
= -2.7V
120
OUTPUT CURRENT vs. CAPACITANCE:
V
IN
= +3.0V, V
OUT
= -2.4V
MAX660 CHART -02
120
250
OUTPUT CURRENT vs. CAPACITANCE:
V
IN
= +4.5V, V
OUT
= -3.5V
MAX660
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
