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SC1660CSTR View Datasheet(PDF) - Semtech Corporation

Part Name
Description
MFG CO.
SC1660CSTR
Semtech
Semtech Corporation Semtech
'SC1660CSTR' PDF : 4 Pages View PDF
1 2 3 4
SWITCHED CAPACITOR
VOLTAGE CONVERTER
SC1660
January 30, 1998
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, TA = 25°C, V+ = 5V, OSC = free running
Parameter
Symbol
Conditions
Min
Input Voltage
V+
RL=
1.5
Supply Current
Output Resistance
IS
ROUT
RL=
IL=20mA, fOSC = 10kHz
Oscillator Frequency
fOSC
Pin 1=V+
RL=
Efficiency
η
RL = 5K, fOSC = 10kHz
96
Voltage Conversion
Efficiency
ηVOUT
RL=
98
Typ
35
45
10
50
98
99.9
Max
9
70
90
Units
V
µA
kHz
%
%
TYPICAL APPLICATIONS
Negative Voltage Converter
Figure 1 shows a typical connection which will
provide a negative supply from an available posi-
tive supply without the need for any external
diodes. The LV pin should be connected to ground
for V+ 3V; for V+ > 3V it may be left floating.
Voltage Doubling
Figure 2 shows a method of voltage doubling.
Doubling is achieved by simply rearranging the
connection of the two external capacitors. An
external 500kresistor is required to ensure the
oscillator will start.
Ultra Precision Voltage Divider
An ultra precision voltage divider is shown in Fig-
ure 3. To achieve the 0.0002% accuracy indicated,
the load current should be kept below 100nA.
However, with a slight loss in accuracy, the load
current can be increased.
Battery Splitter
A common need in many systems is to obtain
positive and negative supplies from a single battery
or power supply system. Where current require-
ments are small, the circuit shown in Figure 4 is a
simple solution.
© 1997 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
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