CAT661EVA-GT3 ON Semiconductor, CAT661EVA-GT3 Datasheet - Page 13

• Manufacturer Part Number: CAT661EVA-GT3
• Description: Charge Pumps CHG PUMP VOLT CONVERTER
• Manufacturer: ON Semiconductor

Specifications of CAT661EVA-GT3

• Rohs: yes
• Function: Inverting
• Output Voltage: 5 V to 11 V
• Output Current: 100 mA
• Supply Current: 0.5 mA
• Maximum Operating Temperature: + 105 C
• Package / Case: SOIC-8
• Input Voltage: 2.5 V to 5.5 V
• Maximum Power Dissipation: 500 mW
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Switching Frequency: 12.5 KHz

Cascade Operation for Higher Negative Voltages
approximately the sum of the individual CAT661 output resistance.
Parallel Operation
capacitor, C2, but the output reservoir capacitor is shared with all devices. The value of C2 should be increased by a factor of
N, where N is the number of devices.
The CAT661 can be cascaded as shown in Figure 28 to generate more negative voltage levels. The output resistance is
V
Paralleling CAT661 devices will lower output resistance. As shown in Figure 29, each device requires its own pump
OUT
= −N x V
C1
C1
+
+
IN
, where N represents the number of cascaded devices.
2
3
4
Figure 29. Reduce Output Resistance BY Paralleling Devices
2
3
4
CAT661
Figure 28. Cascading to Increase Output Voltage
“1”
CAT661
“1”
ROUT +
8
5
+V
8
5
C1N
IN
+V
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N (NUMBER OF DEVICES)
C1N
IN
ROUT (of CAT661)
+
+
C2
13
+
2
3
4
4
2
3
CAT661
“N”
CAT661
“N”
8
5
8
5
+
C2
+
C2
V
OUT
= −NV
IN