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LTC660

100mA CMOS

Voltage Converter

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Simple Conversion of 5V to – 5V Supply

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Output Drive: 100mA

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BOOST Pin (Pin 1) for Higher Switching Frequency

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Inverting and Doubling Modes

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Minimum Open Circuit Voltage Conversion

Efficiency: 99%

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Typical Power Conversion Efficiency

with a 100mA Load: 88%

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Easy to Use

The LTC

voltage converter. It performs supply voltage conversion

from positive to negative from an input range of 1.5V to

5.5V, resulting in complementary output voltages of

– 1.5V to – 5.5V. It also performs a doubling at an input

voltage range of 2.5V to 5.5V, resulting in a doubled

output voltage of 5V to 11V. Only two external capacitors

are needed for the charge pump and charge reservoir

functions.

The converter has an internal oscillator that can be

overdriven by an external clock or slowed down when

connected to a capacitor. The oscillator runs at a 10kHz

frequency when unloaded. A higher frequency outside the

audio band can also be obtained if the BOOST pin is tied

The LTC660 contains an internal oscillator, divide-by-two,

voltage level shifter and four power MOSFETs.

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Conversion of 5V to

±5V Supplies

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Inexpensive Negative Supplies

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Data Acquisition Systems

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High Current Upgrade to LTC1044 or LTC7660

FEATURES

Output Voltage vs

LOAD CURRENT (mA)

0

–5.0

–4.8

–4.6

–4.4

–4.2

–4.0

80

660 TA02

20

40

60

100

, LTC and LT are registered trademarks of Linear Technology Corporation.

Generating – 5V from 5V

1

2

3

4

8

7

6

5

BOOST

GND

C2

150

µF

660 TA01

C1

150

µF

–5V

OUTPUT

5V INPUT

LTC660

OSC

LV

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