LM2660

SNVS135D – SEPTEMBER 1999 – REVISED MAY 2013

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Typical Performance Characteristics (continued)

(Circuit of Figure 1)

Oscillator Frequency

vs

Temperature (FC = Open)

Figure 14.

CONNECTION DIAGRAMS

Figure 15. Top View

8-Lead SOIC (D) or VSSOP (DGK)

Pin Description

Function

Pin

Name

Voltage Inverter

Voltage Doubler

Frequency control for internal oscillator:

1

FC

Same as inverter.

FC has no effect when OSC pin is driven

externally.

Connect this pin to the positive terminal of charge-

2

CAP+

Same as inverter.

pump capacitor.

3

GND

Power supply ground input.

Power supply positive voltage input.

Connect this pin to the negative terminal of

4

CAP

−

Same as inverter.

charge-pump capacitor.

5

OUT

Negative voltage output.

Power supply ground input.

Low-voltage operation input. Tie LV to GND when

input voltage is less than 3.5V. Above 3.5V, LV

6

LV

can be connected to GND or left open. When

LV must be tied to OUT.

driving OSC with an external clock, LV must be

connected to GND.

Oscillator control input. OSC is connected to an

internal 15 pF capacitor. An external capacitor can Same as inverter except that OSC cannot be driven by

7

OSC

be connected to slow the oscillator. Also, an

an external clock.

external clock can be used to drive OSC.

8

V+

Power supply positive voltage input.

Positive voltage output.

6

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