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HT7660 датащи(PDF) 4 Page - Holtek Semiconductor Inc

номер детали HT7660
подробное описание детали  CMOS Switched-Capacitor Voltage Converter
PDF  9 Pages
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производитель  HOLTEK [Holtek Semiconductor Inc]
домашняя страница  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT7660 датащи(HTML) 4 Page - Holtek Semiconductor Inc

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HT7660
4
November 30, 1999
Functional Description
HT7660 needs only two external polarized elec-
trolytic capacitors to complete a negative volt-
age converter.
HT7660 has four MOS power switches: S1, S2,
S3 and S4. For the first half cycle, when S2 and
S4 are open, Capacitor C1 is charged to a volt-
age VDD through S1 and S3. During the second
half cycle, when S1 and S3 are open, the charge
on Capacitor C1 is shifted to Capacitor C2
through S2 and S4. Thereby, the voltage across
Capacitor C2 is VDD. Because the positive ter-
minal of C2 is connected to VSS, we get a -VDD
voltage at VOUT pin.
For high voltage operation, the LV pin is left
floating to enable the voltage regulator. This
can reduce the current consumption of the RC
oscillator, and thus get a fixed switching fre-
quency Fosc with high voltage range. For low
voltage operation, the LV pin is connected to
VSS to bypass the voltage regulator of which in-
herent voltage drop can degrade the operation
at low voltages.
A capacitor may be connected between VDD and
pin OSC to lower the switching Fosc, and an ex-
ternal clock may be added to replace the
built-in RC oscillator.
V DD
V SS
S1
C2
S3
CA P +
CA P -
S4
V SS
V OU T = - V DD
C1
S2
The operating mode of HT7660



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