Connection Diagram

Ordering Information

Order Number

Package

Number

Package

Marking

Supplied as

LM2665M6

MA06A

SO4A (Note 9)

Tape and Reel (1000 units/rail)

LM2665M6X

MA06A

SO4A (Note 9)

Tape and Reel (3000 units/rail)

Note 9: The first letter

″S″ identifies the part as a switched capacitor converter. The next two numbers are the device number. The fourth letter ″A″ indicates the

grade. Only one grade is available. Larger quantity reels are available upon request.

Pin Description

Pin

Name

Function

Voltage Doubler

Voltage Split

1

V+

Power supply positive voltage input.

Positive voltage output.

2

GND

Power supply ground input

Same as doubler

3

CAP−

Connect this pin to the negative terminal of the

charge-pump capacitor

Same as doubler.

4

SD

Shutdown control pin, tie this pin to ground in normal

operation.

Same as doubler.

5

OUT

Positive voltage output.

Power supply positive voltage

input

6

CAP+

Connect this pin to the positive terminal of the

charge-pump capacitor.

Same as doubler

Circuit Description

The LM2665 contains four large CMOS switches which are

switched in a sequence to double the input supply voltage.

Energy transfer and storage are provided by external capaci-

tors. Figure 2 illustrates the voltage conversion scheme.

When S

age V+. During this time interval, switches S

open. In the next time interval, S

same time, S

age V+ and the voltage across C

age when there is no load. The output voltage drop when a

load is added is determined by the parasitic resistance (R

d-

s(on)

of the MOSFET switches and the ESR of the capacitors)

and the charge transfer loss between capacitors. Details will

be discussed in the following application information section.

Application Information

Positive Voltage Doubler

The main application of the LM2665 is to double the input

voltage. The range of the input supply voltage is 2.5V to

5.5V.

The output characteristics of this circuit can be approximated

by an ideal voltage source in series with a resistance. The

6-Lead SOT (M6)

DS100049-13

Top View With Package Marking

DS100049-22

Actual Size

DS100049-14

FIGURE 2. Voltage Doubling Principle

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