GS7660 Datasheet, PDF (8/9 Pages) Vishay Siliconix – Switched-Capacitor Voltage Converter

GS7660
Vishay
formerly General Semiconductor
Ultra Precision Voltage Divider
An ultra precision voltage divider is shown below in Fig. 12.
To achieve the 0.002% accuracy, the load current has to be
kept below 100nA. However with a slight loss in accuracy,
the load current can be increased.
VIN (3.0V to 12V)
C1 ⁺
10µF
VIN _±0.002%
2
1
2
3
4
+ _C2
10µF
8₈
7₇
GS7660
6₆
5₅
Required for VIN < 3V
IL ≤ 100nA
Fig. 12 – Ultra Precision Voltage Divider
Battery Splitter
Fig. 13 shows a simple solution to obtain complementary +
and – supplies from a single power supply. The output volt-
ages are + and – half the supply voltage. Good accuracy
requires low load currents.
A disadvantage is the requirement of a floating input supply,
which in the case of a battery is not an issue.
(VIN)
C1
10µF +
1
8₈
2
7 ₇ C1
GS7660
10µF +
3
6₆
4
5₅
1
8
2
7
GS7660
3
6
4
5
VOUT =
--(VIN)
1/4 CD4077
C2
20µF ⁺
Fig. 14 – Paralleling for Lower Output Resistance
Paralleling For Lower Output Impedance
Fig. 14 above shows two GS7660s connected in parallel to
achieve a lower output resistance. If the output resistance
is dominated by 1/ f C1, which is normally the case with the
GS7660, increasing C1 offers a greater advantage than
the paralleling of circuits.
V_B ⁺
(6V) _–
C1 ⁺
10µF _–
1
8₈
2
7₇
GS7660
3
6₆
4
5₅
+VB /2 (3.0V)
Required for VB < 6V
–VB /2 (–3.0V)
– _C2
+ ^10µF
Output Common
Fig. 13 – Battery Splitter
www.vishay.com
8
Document Number 74819
24-May-02