EV1340QI-E Datasheet, PDF (8/10 Pages) Altera Corporation – 40V, Low Quiescent Current, 50mA Linear Regulator

Page 8
Functional Description
Functional Overview
The EY1602 is a high performance, high voltage, low-dropout regulator (LDO) with 50mA sourcing capability. The
part is rated to operate over the -40°C to +125°C temperature range. Featuring ultra-low quiescent current, it makes an
ideal choice for “always-on” applications. It works well under a “load dump condition” where the input voltage could
rise up to 40V. The device also features current limit and thermal shutdown protection.
Enable Control
The EY1602 features an Enable pin. When it is pulled low, the IC goes into shutdown mode. In this condition, the
device draws less than 2µA. Driving the pin high turns the device on. For always on operation, the EN pin can be tied
directly to VIN.
Current Limit Protection
The EY1602 has internal current limit functionality to protect the regulator during fault conditions. During current
limit, the output sources a fixed amount of current largely independent of the output voltage. If the short or overload
is removed from VOUT, the output returns to normal voltage regulation mode.
Thermal Fault Protection
In the event that the die temperature exceeds typically +165°C, the output of the LDO will shut down until the die
temperature cools down to typically +145°C. The level of power dissipated, combined with the ambient temperature
and the thermal impedance of the package, will determine if the junction temperature exceeds the thermal shutdown
temperature. Also see the section on “Power Dissipation”.
Application Information
Input and Output Capacitors
For the output, a ceramic capacitor (X5R or X7R) with a capacitance of 10µF is recommended for the EY1602 to
maintain stability. The ground connection of the output capacitor should be routed directly to the GND pin of the
device and also placed close to the IC. A minimum of 0.1µF (X5R or X7R) is recommended at the input.
EY1602 40V, Low Quiescent Current, 50mA Linear Regulator
09618
March 14, 2014
February 2014 Altera Corporation
Rev A