1.5

1.8

2

2.2

2.5

2.8

3

3.2

2

3

4

5

6

7

8

9

10

11

12

Input Voltage (V)

Maximum Output Current Buck

I

= I

OUT

SW

V

OUT

Duty Cycle Buck

D =

V

IN

TPS63060, TPS63061

www.ti.com

SLVSA92B – DECEMBER 2011 – REVISED DECEMBER 2014

Device Functional Modes (continued)

(3)

where

•

η is the estimated converter efficiency (use the number from the efficiency curves or 0.80 as an assumption)

•

f is the converter switching frequency (typical 2.4 MHz)

•

L is the selected inductor value

(4)

If the die temperature increases above the recommended maximum temperature, the dynamic current limit

becomes active. The current limit is reduced with temperature increasing.

Figure 7. Average Inductance Current vs Input Voltage

8.4.6 Device Enable

The device operates when EN is set high. The device enters a shutdown sequence when EN is set to GND.

During the shutdown sequence, the regulator stops switching, all internal control circuitry is switched off, and the

load is disconnected from the input. It is possible for the output voltage to drop below the input voltage during

shutdown. During the start-up sequence, the device limits the duty cycle and the peak current in order to avoid

high peak currents flowing from the input.

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