XRP6272ITC5TR-F Datasheet, PDF (9/13 Pages) Exar Corporation – 2A 5V-Adjustable Low Dropout Voltage Regulator

XRP6272
2A 5V-Adjustable Low Dropout Voltage Regulator
POWER DISSIPATION
The power dissipation across the device can be
calculated as:
-
The total junction temperature is calculated
as:
where, T_J is the junction temperature, T_A is the
ambient temperature and Θ_JA is the thermal
resistance between junction to ambient.
There is a temperature rise associated with
this power dissipated while operating in a
given ambient temperature. If the calculated
junction temperature exceeds maximum
junction temperature specification, then the
built-in thermal protection feature is triggered
as described previously.
To insure reliable performance, the maximum
allowable power dissipation for a given
ambient temperature must be considered and
it can be calculated as follows:
⁄
where, T_J(MAX) is the maximum junction
temperature, T_A is the ambient temperature
and Θ_JA is the thermal resistance between
junction to ambient. In order to insure the
best thermal flow, proper mounting of the IC
is required.
LAYOUT CONSIDERATION
1. Connect the bottom-side pad to a large
ground plane for good thermal conductivity
and to reduce the thermal resistance of the
device.
2. The input capacitor C_IN and output capacitor
C_OUT must be placed as close as possible to
the pins V_IN and V_OUT respectively.
3. Use short wires to connect the power supply
to pins V_IN and GND on the board.
© 2011 Exar Corporation
9/13
Rev. 1.2.0