TCM680 datasheet(5/7 Pages) TELCOM

5 / 7 page

4-17

TELCOM SEMICONDUCTOR, INC.

TCM680

+5V TO

±10V VOLTAGE CONVERTER

Table 1. ROUT vs. C1 ,C2

C1, C2 (

µF)

ROUT (

Ω)

0.1

1089

0.47

339

232

3.3

165

4.7

157

146

141

100

137

Table 2. VRIPPLE (p-p) vs. C3, C4 (IOUT = 10mA)

C3, C4 (

µF)

VRIPPLE (mV)

0.47

1540

734

3.3

236

4.7

172

100

Paralleling Devices

Paralleling multiple TCM680s reduces the output resis-

tance of both the positive and negative converters. The

effective output resistance is the output resistance of a

single device divided by the number of devices. As illus-

trated in Figure 7, each requires separate pump capacitors

C1 and C2, but all can share a single set of reservoir

capacitors.

±5V Regulated Supplies From A Single

3V Battery

Figure 8 shows a complete

±5V power supply using one

3V battery. The TCM680 provides +6V at V

OUT, which is

regulated to +5V by the TC55, and –5V by the negative LDO.

The input to the TCM680 can vary from 3V to 6V without

affecting regulation appreciably. With higher input voltage,

more current can be drawn from the outputs of the TCM680.

With 5V at VIN, 10mA can be drawn from both regulated

outputs simultaneously. Assuming 150

Ω source resistance

for both converters, with (I

L + IL) = 20mA, the positive charge

pump will droop 3V, providing +7V for the negative charge

pump.

OUT

GND

µF

NEGATIVE

SUPPLY

TCM680

GND

–

Figure 7. Paralleling TCM680 for Lower Output Source Resistance

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