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DESCRIPTION
The SCI7660 Series is a highly efficient CMOS DC/DC
converter for doubling an input voltage. This power-
saving IC allows portable computers and similar hand-
held equipment to operate from a single power supply,
even when they incorporate LSIs that operate at volt-
ages different from those of logic circuits, for example,
LCD drivers and analog LSIs.
The SCI7660C
is available in 8-pin plastic DIPs, and
0B
the SCI7660M
, in 8-pin plastic SOPs.
0B
FEATURES
• 95% (typ.) conversion efficiency
• Two output voltages, V
O
• 30mA maximum output current at 5V
• Two-in-series configuration doubles negative output
voltage.
• Low operating voltage
• On-chip RC oscillator
• 8-pin plastic DIP and 8-pin plastic SOP
APPLICATIONS
• Fixed-voltage power supplies for battery-operated
equipment
• Power supplies for pagers, memory cards, calculators
and similar hand-held equipment
• Fixed-voltage power supplies for medical equipment
• Fixed-voltage power supplies for communications
equipment
• Uninterruptable power supplies
PIN DESCRIPTION
Number
Name
1
NC
2
OSC2
3
OSC1
4
V
DD
5
CAP1+
6
CAP1–
7
V
O
8
V
I
SCI7000 Series
Technical Manual
, relative to V
and V
DD
I
No connection
Resistor connection. Open when using external clock
Resistor connection. Clock input when using external clock
Positive supply (system V
Positive charge-pump connection
Negative charge-pump connection
×2 multiplier output
Negative supply (system ground)
EPSON
BLOCK DIAGRAM
V
DD
OSC1
RC oscillator
OSC2
V
I
Voltage converter
PIN CONFIGURATION
NC
1
OSC2
2
SCI7660C
OSC1
3
V
4
DD
Description
)
CC
SCI7660 Series
CAP1+
CAP1–
V
O
8
V
I
7
V
O
0B
6
CAP1–
5
CAP1+
1–1
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