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SC1660

SWITCHED CAPACITOR VOLTAGE CONVERTER

Semtech Corporation 

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

Ω

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 500kΩ resistor 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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