CAT661_12 Datasheet, PDF (2/14 Pages) ON Semiconductor – High Frequency 100 mA CMOS Charge Pump, Inverter/Doubler

CAT661
Typical Application
C1 ₊
1 mF to
100 mF
+V_IN
1.5 V to 5.5 V
1 _BOOST/FC
8
V+
2 _CAP+
7
OSC
3
CAT661
GND
LV
6
4 _CAP−
5
OUT
C2
Inverted
Negative
Voltage
Output
1 mF to
100 mF
Figure 1. Voltage Inverter
1 mF to
100 mF ₊
C1
V_IN = 2.5 V
to 5.5 V
1 _BOOST/FC
8
V+
2 _CAP+
7
OSC
3
CAT661
GND
LV
6
4 _CAP−
5
OUT
Doubled
Positive
Voltage
C2 ^Output
1 mF to
100 mF
Figure 2. Positive Voltage Doubler
Table 1. PIN DESCRIPTIONS
Circuit Configuration
Pin Number
Name
Inverter Mode
Doubler Mode
1
Boost/FC Frequency Control for the internal oscillator. With an external Same as inverter.
oscillator BOOST/FC has no effect.
Boost/FC
Oscillator Frequency
Oscillator Frequency
Open
25 kHz typical, 10 kHz minimum
40 kHz typical
V+
135 kHz typical, 80 kHz minimum
135 kHz typical, 40 kHz minimum
2
CAP+
Charge Pump Capacitor. Positive terminal.
Same as inverter.
3
GND
Power Supply Ground.
Power supply. Positive voltage input.
4
CAP−
Charge pump capacitor. Negative terminal.
Same as inverter.
5
OUT
Output for negative voltage.
Power supply ground.
6
LV
Low−Voltage selection pin. When the input voltage is less
LV must be tied to OUT for all input
than 3 V, connect LV to GND. For input voltages above 3 V, voltages.
LV may be connected to GND or left open. If OSC is driven
externally, connect LV to GND.
7
OSC
Oscillator control input. An external capacitor can be connec- Same as inverter. Do not overdrive OSC
ted to lower the oscillator frequency. An external oscillator
in doubling mode. Standard logic levels
can drive OSC and set the chip operating frequency. The
will not be suitable. See the applications
charge−pump frequency is one−half the frequency at OSC. section for additional information.
8
V+
Power supply. Positive voltage input.
Positive voltage output.
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