TPS60400

OUT

C1+

IN

C1–

GND

1

2

3

5

4

C(fly)

1 µF

CO

1 µF

CI

1 µF

VO (–2 VI)

GND

VI

GND

TPS60400

OUT

C1+

IN

C1–

GND

1

2

3

5

4

CO

1 µF

GND

+

+

+

C(fly)

1 µF

Figure 9-8. Doubling Inverter

The application allows to increase the output current by using two or more in parallel.

Paralleling multiple TPS6040xs reduces the output resistance. Each device requires its own flying capacitor

(C(fly)), but the output capacitor (CO) serves all devices (see Figure 9-9). Increase CO's value by a factor of n,

where n is the number of parallel devices. Equation 1 shows the equation for calculating output resistance.

TPS60400

OUT

C1+

IN

C1–

GND

1

2

3

5

4

C(fly)

1 µF

CI

1 µF

VO (–VI)

GND

VI

GND

TPS60400

OUT

C1+

IN

C1–

GND

1

2

3

5

4

C(fly)

1 µF

CO

2.2 µF

+

Figure 9-9. Paralleling Devices

The application adds a shutdown function.

If shutdown is necessary, use the circuit in Figure 9-10. The output resistance of the TPS6040x typically is 15 Ω

plus two times the output resistance of the buffer.

Connecting multiple buffers in parallel reduces the output resistance of the buffer driving the IN pin.

TPS60400

OUT

C1+

IN

C1–

GND

1

2

3

5

4

C(fly)

1 µF

CO

1 µF

CI

1 µF

VO (–VI)

GND

VI

GND

SDN

Figure 9-10. Shutdown Control

The application generates a regulated output voltage for a GaAs bias supply.

TPS60400, TPS60401, TPS60402, TPS60403

SLVS324C – JULY 2001 – REVISED OCTOBER 2020

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