ETA5095

www.etasolution.com

7

Powering Minds of the SmartS

FUNCTIONAL DESCRIPTION

General Description

The main feature of the ETA5095 is its capability to operate with wide input range and with small input and

output capacitors. ETA5095 use a new architecture of LDO to have sufficient phase margin over all

positions of the output capacitor pole. It also includes protection features like input over voltage protection,

short circuit protection and thermal shutdown.

Enable Sequence

ETA5095 is enabled when all following conditions occur:



EN pin voltage is greater than a logic high,



UVLO < VIN < OVP,



Junction temperature is less than Thermal Shutdown,

Once all above conditions are occurred, ETA5095 will be enabled after 500us. In case any of above

conditions is not correct, ETA5095 will be in shutdown mode. EN pin is internally pulled up to a Logic High.

Output Current Limit and Foldback Current Limit

ETA5095 guarantees 150mA output current for all output voltage configuration, so it is designed with 250mA

(typically). ETA5095 current limit is reduced when output voltage is less than 75% of the configuration. The

reduction is linearity and finish when output voltage is at 25% when the limit is only 20mA (typically) left. This

feature will make sure ETA5095 will always do its start-up successfully with any load less than maximum

loading.

Over-Temperature Protection

Thermal protection disables the output when the junction temperature rises to approximately 150oC, allowing

the device to cool down. When the junction temperature cools to approximately 120°C, the output circuitry is

again enabled. Depending on power dissipation, thermal resistance, and ambient temperature, the thermal

protection circuit may cycle on and off. This cycling limits regulator dissipation, protecting the device from

damage as a result of overheating.

APPLICATION INFORMATION

Capacitor Selection

ETA5095 does not require high capacitors at both VIN and VOUT pins for stability. Using 100nF capacitor at

VOUT will be suitable for the output voltage up to 8V, with any load type. Using 220nF capacitor at VOUT will

be suitable for the output voltage up to 14V, with any load type.