CAT661ESA ON Semiconductor, CAT661ESA Datasheet - Page 12

• Manufacturer Part Number: CAT661ESA
• Manufacturer: ON Semiconductor
• Type: Inverting/Step Upr

Specifications of CAT661ESA

• Operating Supply Voltage (min): 1.5V
• Operating Supply Voltage (max): 5.5V
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Package Type: SOIC
• Pin Count: 8
• Mounting: Surface Mount
• Output Voltage: -5.5 to -1.5/5 to 11V
• Output Current: 100mA
• Lead Free Status / RoHS Status: Not Compliant

BATTERY VOLTAGE SPLITTER
Positive and negative voltages that track each other can be obtained from a battery. Figure 11 shows how a 9V battery
can provide symmetrical positive and negative voltages equal to one-half the battery voltage.
CASCADE OPERATION FOR HIGHER NEGATIVE VOLTAGES
The CAT661 can be cascaded as shown in figure 12 to generate more negative voltage levels. The output resistance
is approximately the sum of the individual CAT661 output resistance.
V
Doc. No. 5003, Rev. J
OUT
= -N x V
3V < V BAT < 11V
BATTERY
IN
, where N represents the number of cascaded devices.
C1
+
9V
V BAT
Figure 12: Cascading to Increase Output Voltage
2
3
4
CAT661
+
"1"
Figure 11: Battery Splitter
1
2
3
4
8
5
+V IN
BOOST/FC
CAP+
GND
CAP-
C1N
CAT661
12
+
+
C2
OSC
OUT
V+
LV
2
3
4
V OUT = -NV IN
8
7
6
5
CAT661
"N"
+
+
8
5
V BAT
2
-
+
V BAT
C2
(4.5V)
2
(-4.5V)