SC1660CS datasheet(2/4 Pages) SEMTECH

2 / 4 page

652 MITCHELL ROAD NEWBURY PARK CA 91320

SWITCHED CAPACITOR

VOLTAGE CONVERTER

SC1660

January 30, 1998

ELECTRICAL CHARACTERISTICS

Unless otherwise specified, T

A = 25°C, V

+ = 5V, OSC = free running

Parameter

Symbol

Conditions

Min

Typ

Max

Units

Input Voltage

L=∞

1.5

Supply Current

L=∞

µA

Output Resistance

OUT

L=20mA, fOSC = 10kHz

Ω

Oscillator Frequency

Pin 1=V

OSC

L=∞

kHz

Efficiency

L = 5K, fOSC = 10kHz

Voltage Conversion

Efficiency

VOUT

L=∞

99.9

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 500k

Ω 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.

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