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TC1121 Datasheet(PDF) 6 Page - Microchip Technology

Part # TC1121
Description  100mA Charge Pump Voltage Converter with Shutdown
PDF  14 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC1121 Datasheet(HTML) 6 Page - Microchip Technology

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TC1121
DS21358B-page 6
 2002 Microchip Technology Inc.
3.4
Cascading Devices
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 ROUT
values. The output voltage (where n is an integer
representing the number of devices cascaded) is
defined by VOUT = -n (VIN).
3.5
Paralleling Devices
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).
FIGURE 3-2:
CASCADING TC1121s TO INCREASE OUTPUT VOLTAGE
FIGURE 3-3:
PARALLELING TC1121s TO REDUCE OUTPUT RESISTANCE
1
1n
8
7
2
N
2n
C1121
C1121
ND
ND
SC
SC
AP
AP
AP
AP
C
C
HDN
UT
UT
N
UT
VIN
HDN
HDN*
HDN*
SHDN should be tied to VIN if ot used.
1"
n"
C1
1n
2
2
N
C1121
C1121
ND
ND
SC
SC
CAP+
AP
AP
AP
FC
C
HDN
UT
UT
N
HDN
HDN*
HDN*
IN if not used.
1"
n"
SC
UT = R UT of TC1121)/n(number of devices)



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