Datasheet

1.5

1.8

2.2

2.5

2.8

3.2

2 3 4 5 6 7 8 9 10 11 12

Input Voltage (V)

Average Inductance current (A)

G000

TPS63060

TPS63061

SLVSA92A –DECEMBER 2011– REVISED FEBRUARY 2012

www.ti.com

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 30. Average Inductance Current versus Input Voltage

Device Enable

The device is put into operation when EN is set high. It is put into a shutdown mode when EN is set to GND. In

shutdown mode, the regulator stops switching, all internal control circuitry is switched off, and the load is

disconnected from the input. This means that the output voltage can drop below the input voltage during

shutdown. During start-up of the converter, the duty cycle and the peak current are limited in order to avoid high

peak currents flowing from the input.

Power Good

The device has a built in power good function to indicate whether the output voltage is regulated properly. As

soon as the average inductor current gets limited to a value below the current the voltage regulator demands for

maintaining the output voltage the power good output gets low impedance. The output is open drain, so its logic

function can be adjusted to any voltage level the connected logic is using, by connecting a pull up resistor to the

supply voltage of the logic. By monitoring the status of the current control loop, the power good output provides

the earliest indication possible for an output voltage break down and leaves the connected application a

maximum time to safely react.

Softstart and Short Circuit Protection

After being enabled, the device starts operating. The average current limit ramps up from an initial 400mA

following the output voltage increasing. At an output voltage of about 1.2V, the current limit is at its nominal

value. If the output voltage does not increase, the current limit will not increase. There is no timer implemented.

Thus, the output voltage overshoot at startup, as well as the inrush current, is kept at a minimum. The device

ramps up the output voltage in a controlled manner even if a large capacitor is connected at the output. When

the output voltage does not increase above 1.2V, the device assumes a short circuit at the output, and keeps the

current limit low to protect itself and the application. At a short on the output during operation, the current limit is

also kept under 2A typically (minimum average inductance current).

Overvoltage Protection

If, for any reason, the output voltage is not fed back properly to the input of the voltage amplifier, control of the

output voltage will not work anymore. Therefore, overvoltage protection is implemented to avoid the output

voltage exceeding critical values for the device and possibly for the system it is supplying. The implemented

overvoltage protection circuit monitors the output voltage internally as well. If it reaches the overvoltage

threshold, the voltage amplifier regulates the output voltage to this value.

Product Folder Link(s): TPS63060 TPS63061