ISL78214_15 Datasheet, PDF (14/15 Pages) Intersil Corporation – 4A Low Quiescent Current High Efficiency Synchronous Buck Regulator

ISL78214
Output Voltage Selection
The output voltage of the regulator can be programmed via an
external resistor divider that is used to scale the output voltage
relative to the internal reference voltage and feed it back to the
inverting input of the error amplifier. Refer to Figure 1 on page 3.
The output voltage programming resistor, R₃, will depend on the
value chosen for the feedback resistor and the desired output
voltage of the regulator. The value for the feedback resistor is
typically between 10kΩ and 100kΩas shown in Equation 2.
R₃ = -V----_O-R---_U-²---_T--^---0_–---.--80---.V--8---V---
(EQ. 2)
If the output voltage desired is 0.8V, then R₃ is left unpopulated
and R₂ is shorted. There is a leakage current from VIN to LX. It is
recommended to preload the output with 10µA minimum. For
better performance, add 47pF in parallel with R₂ (100kΩ
Input Capacitor Selection
The main functions for the input capacitor are to provide
decoupling of the parasitic inductance and to provide filtering
function to prevent the switching current flowing back to the
battery rail. Two 22µF X5R or X7R ceramic capacitors are a good
starting point for the input capacitor selection.
Revision History
The revision history provided is for informational purposes only and is believed to be accurate, but not warranted. Please go to web to make sure you
have the latest Rev.
DATE
REVISION
CHANGE
May 12, 2015
FN7551.2
On page 4
-Added “Tested per AEC...” information to ESD ratings.
-Updated Latch-up information from Jedec to AEC spec and results.
-Added Shutdown Supply Current max for +105°C of “10µA”.
Updated About Intersil verbiage.
December 4, 2013
FN7551.1
Updated to newest template
Page 1 - updated copyright information
Page 22 - 2nd line of the disclaimer changed from:
“Intersil products are manufactured, assembled and tested utilizing ISO9001 quality systems as noted”
to:
“Intersil Automotive Qualified products are manufactured, assembled and tested utilizing TS16949 quality
systems as noted”.
March 8, 2010
FN7551.0 Initial release.
About Intersil
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FN7551.3
May 12, 2015