TPS61087

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SLVS821C – MAY 2008 – REVISED JULY 2013

Frequency Select Pin (FREQ)

The frequency select pin FREQ allows to set the switching frequency of the device to 650 kHz (FREQ = low) or

1.2 MHz (FREQ = high). Higher switching frequency improves load transient response but reduces slightly the

efficiency. The other benefits of higher switching frequency are a lower output ripple voltage. The use of a 1.2

MHz switching frequency is recommended unless light load efficiency is a major concern.

Undervoltage Lockout (UVLO)

To avoid mis-operation of the device at low input voltages an undervoltage lockout is included that disables the

device, if the input voltage falls below 2.4 V.

Thermal Shutdown

A thermal shutdown is implemented to prevent damages due to excessive heat and power dissipation. Typically

the thermal shutdown happens at a junction temperature of 150°C. When the thermal shutdown is triggered the

device stops switching until the junction temperature falls below typically 136°C. Then the device starts switching

again.

Overvoltage Prevention

If overvoltage is detected on the FB pin (typically 3 % above the nominal value of 1.238 V) the part stops

switching immediately until the voltage on this pin drops to its nominal value. This prevents overvoltage on the

output and secures the circuits connected to the output from excessive overvoltage.

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