
CAT661
2
Doc. No. 5003, Rev. J
Oscillator Frequency
25kHz typical, 10kHz minimum
135kHz typical, 80kHz minimum
Charge Pump Capacitor. Positive terminal.
PIN CONFIGURATION
SO Package (S, X)
PIN DESCRIPTIONS
Circuit Configuration
Pin Number
1 Boost/FC
Name
Inverter
Freqency Control for the internal oscillator.
With an external oscillator BOOST/FC has
no effect.
Doubler
Boost/FC
Oscillator Frequency
Open
40kHz typical
V+
135kHz typical, 40kHz minimum
2
CAP+
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
LV must be tied to OUT for all input
voltages.
8
V+
Power supply. Positive voltage input.
Positive voltage output.
Same as inverter.
Low-Voltage selection pin. When the input
voltage is less than 3V, connect LV to GND.
For input voltages above 3V, LV may be
connected to GND or left open. If OSC is
driven externally, connect LV to GND.
Oscillator control input. An external capacitor
can be connected to lower the oscillator
frequency. An external oscillator can drive
OSC and set the chip operating frequency.
The charge-pump frequency is one-half the
frequency at OSC.
Same as inverter. Do not overdrive
OSC in doubling mode. Standard logic
levels will not be suitable. See the
applications section for additional
information.
7
OSC
(Top View)
TDFN Package: 4mm x 4mm
0.8mm maximum height
TDFN Package (RD8, ZD8)
DIP Package (P)
ORDERING INFORMATION
Part Number
Package
Temperature Range
CAT661EPA
8 lead Plastic DIP
-40
°
C to 85
°
C
CAT661ESA
8-lead SO
-40
°
C to 85
°
C
CAT661ESA-TE13
8-lead SO, Tape & Reel
-40
°
C to 85
°
C
CAT661EVA
8-lead SO (Lead-free, Halogen-free)
-40
°
C to 85
°
C
CAT661EVA-TE13
8-lead SO (Lead-free, Halogen-free)
-40
°
C to 85
°
C
CAT661ERD8
8-pad TDFN
-40
°
C to 85
°
C
CAT661EZD8
8-pad TDFN (Lead-free, Halogen-free)
-40
°
C to 85
°
C
8
7
6
5
1
2
3
4
BOOST/FC
CAP+
GND
CAP-
V+
OSC
LV
OUT
CAT661
8
7
6
5
1
2
3
4
BOOST/FC
CAP+
GND
CAP-
V+
OSC
LV
OUT
CAT661
8
7
6
5
1
2
3
4
BOOST/FC
CAP+
GND
CAP-
V+
OSC
LV
OUT
CAT661