TC1121EPA Microchip Technology, TC1121EPA Datasheet - Page 6

• Manufacturer Part Number: TC1121EPA
• Description: IC CHARGE PUMP CONV 100MA 8-DIP
• Manufacturer: Microchip Technology
• Type: Switched Capacitor (Charge Pump), Invertingr

Specifications of TC1121EPA

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: -2.4 ~ -5.5 V
• Current - Output: 100mA
• Frequency - Switching: 10kHz ~ 200kHz
• Voltage - Input: 2.4 ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Through Hole
• Package / Case: 8-DIP (0.300", 7.62mm)
• Power - Output: 730mW
• Primary Input Voltage: 5V
• No. Of Outputs: 1
• Output Voltage: -5.5V
• Output Current: 100mA
• No. Of Pins: 8
• Operating Temperature Range: -40°C To +85°C
• Power Dissipation Pd: 470mW
• Function: Inverting
• Maximum Operating Temperature: 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: Through Hole
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 158-1063; 158-1063

TC1121
3.4
To produce greater negative magnitudes of the initial
supply voltage, the TC1121 may be cascaded (see
Figure 3-2). Resulting output resistance is approxi-
mately equal to the sum of individual TC1121 R
values. The output voltage (where n is an integer
representing the number of devices cascaded) is
defined by V
FIGURE 3-2:
FIGURE 3-3:
DS21358C-page 6
Cascading Devices
OUT
*SHDN should be tied to V
R
OUT
C1
= -n (V
C1
*SHDN should be tied to V
= R
+
Cascading TC1121s to Increase Output Voltage
Paralleling TC1121s to Reduce Output Resistance
OUT
IN
+
).
2
3
4
(of TC1121)/n(number of devices)
FC
CAP
GND
CAP
3
4
2
TC1121
+
–
FC
CAP
GND
CAP
“1”
TC1121
IN if
+
–
SHDN
V
OSC
“1”
OUT
V
not used.
IN if
IN
SHDN
V
OSC
OUT
V
not used.
8
7
5
IN
V +
5
8
IN
SHDN*
V
OSC
OUT
+
IN
SHDN*
C1n
C1n
+
+
+
3.5
To reduce output resistance, multiple TC1121s may be
paralleled (see Figure 3-3). Each device needs a pump
capacitor C1, but the reservoir capacitor C2 serves all
devices. The value of C2 should be increased by a
factor of n (the number of devices).
C2
2
3
4
3
2
4
FC
CAP
GND
CAP
FC
CAP
GND
CAP
Paralleling Devices
TC1121
+
–
TC1121
+
–
“n”
“n”
SHDN
V
SHDN
OSC
V
OUT
OSC
V
OUT
V
IN
IN
8
7
5
8
7
5
© 2006 Microchip Technology Inc.
+
+
SHDN*
SHDN*
C2
C2n
V
OUT