TC682 Просмотр технического описания (PDF) - Microchip Technology

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TC682

Inverting Voltage Doubler

Microchip Technology 

TC682

4.3 Paralleling Devices

Paralleling multiple TC682s reduces the output

resistance of the converter. The effective output

resistance is the output resistance of a single device

divided by the number of devices. As illustrated in

Figure , each requires separate pump capacitors C1

and C2, but all can share a single reservoir capacitor.

VIN

4.4 -5V Regulated Supply From A

Single 3V Battery

Figure 4-3 shows a -5V power supply using one 3V

battery. The TC682 provides -6V at VOUT, which is

regulated to -5V by the negative LDO. The input to the

TC682 can vary from 3V to 5.5V without affecting

regulation appreciably. A TC54 device is connected to

the battery to detect undervoltage. This unit is set to

detect at 2.7V. With higher input voltage, more current

can be drawn from the outputs of the TC682. With 5V

at VIN, 10 mA can be drawn from the regulated output.

Assuming 150 source resistance for the converter,

with IL–= 10 mA, the charge pump will droop 1.5V.

+

10 μF

–

+

10 μF

–

GND

C1+ VIN

C1–

TC682

C2+

C2– GND

V–OUT

+

10 μF

–

+

10 μF

–

C1+ VIN

C1–

TC682

C2+

C2– GND

V–OUT

Negative

Supply

–

+ C–OUT 22 μF

FIGURE 4-2:

Paralleling TC682 for Lower Output Source Resistance

+

10 μF

–

+

3V

–

+

10 μF

–

C1+ VIN

C1–

C2+ TC682

C2–

V–OUT

GND

–

22 μF

+ COUT–

VSS

VIN

VOUT

Negative LDO

Regulator

+

1 μF

–

Ground

-5 Supply

TC54VC2702Exx

VIN

VOUT

VSS

LOW BATTERY

FIGURE 4-3:

Negative Supply Derived from 3V Battery

DS21453D-page 6

 2002-2012 Microchip Technology Inc.

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