LP3100 datasheet(7/8 Pages) POWER

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LP3100– 00

Aug.-2014

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Preliminary Datasheet

LP3100

Application Information

The LP3100 offers dual channel output voltage for

powering on specified power in TFT LCD panels.

The device integrates a positive charge pump and a

negative charge pump.

Enable Control (EN)To turn on the LP3100, the EN

pin must be at logic high. When the EN pin is pulled

to a logic low, the device is disabled and the supply

current reduces to less than 1μA.

VIN

C1P

C1N

C2P

C2N

GND

Cin

VIN

Positive

Output

Enable

Clock

Logical

Control

Chip

Enable

Figure 1. Positive Charge Pump Functional Block Diagram

The LP3100 positive charge pump provides an

output voltage VP of 1.5x or 2x the input voltage.

The positive charge pump uses two external flying

capacitors to generate the required output voltage.

For the selected output to input ratio, the charge

pump will configure the internal switches to charge

the flying capacitors. Figure 1shows the functional

diagram of the positive charge pump.

Negative Charge Pump Controller

The negative charge pump uses one external flying

capacitor to generate an inverted negative voltage

that is –1x of VP. Figure 2 shows the functional

block diagram of the negative charge pump.

Figure 2. Negative Charge Pump Functional Block Diagram

LAYOUT CONSIDERATION

Use a ground plane for the LP3100 device that can

be connected to the device expose pad and ground

pin for optimal thermal characteristics.

Bypass Capacitors

Place VIN, VP, and VN bypass capacitors as close

as possible to the device pin. Keep the ground traces

from the bypass to the ground plane as short as

possible.

Flying Capacitors

Place the flying capacitors as close to the device

pins as possible to minimize trace noise since the

flying capacitors to the pins will generate high

transient voltage (dv/dt) switching signals.

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