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TC1121 Fiches technique(PDF) 7 Page - Microchip Technology

No de pièce TC1121
Description  100mA Charge Pump Voltage Converter with Shutdown
PDF  14 Pages
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Fabricant  MICROCHIP [Microchip Technology]
Site Internet  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC1121 Fiches technique(HTML) 7 Page - Microchip Technology

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 2002 Microchip Technology Inc.
DS21358B-page 7
TC1121
3.6
Combined Positive Supply
Multiplication and Negative
Voltage Conversion
Figure 3-4 shows this dual function circuit, in which
capacitors C1 and C2 perform pump and reservoir
functions to generate negative voltage. Capacitors C3
and C4 are the respective capacitors for multiplied
positive voltage. This particular configuration leads to
higher source impedances of the generated supplies
due
to
the
finite
impedance
of
the
common
charge-pump driver.
FIGURE 3-4:
COMBINED POSITIVE MULTIPLER AND NEGATIVE CONVERTER
1
1
2
1, D2 = 1N4148
2
4
3
VIN
+
UT = (2VIN) –
V
) – (VFD2)
C1121
ND
SC
AP
AP
C
HDN
UT
N
HDN*
UT = VIN
–
SHDN should be tied to VIN if not used.



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