ISL78213_15 Datasheet, PDF (15/16 Pages) Intersil Corporation – 3A Low Quiescent Current, High Efficiency Synchronous Buck Regulator

ISL78213
TABLE 1. OUTPUT CAPACITOR VALUE vs V_OUT
V_OUT
(V)
C_OUT
L
(µF)
(µH)
0.8
2 x 22
1.0~2.2
1.2
2 x 22
1.0~2.2
1.5
2 x 22
1.5~3.3
1.8
2 x 22
1.5~3.3
2.5
2 x 22
1.5~3.3
3.3
2 x 22
2.2~4.7
3.6
2 x 22
2.2~4.7
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
FN7550.3 On page 5: Added “Tested per” information to Human Body Model, Machine Model and Charge Device Model.
Updated Latch-up from: "Tested and passed per JESD78A" to: (Tested per AEC-Q100-004, Class II, Level A)...100mA
Electrical Spec table: Added Shutdown Supply Current max for +105°C.
December 4, 2013 FN7550.2 Updated 2nd line of the disclaimer 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”
Plus additional edits:
Updated to current template
page 1 - Updated copyright area
page 34 Updated standard “Products” section verbiage to “About Intersil” verbiage.
March 11, 2010 FN7550.1 On Page 5, under PG, corrected typo for MAX limit from 0.2 to 2.0.
March 8, 2010 FN7550.0 Initial release.
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FN7550.3
May 12, 2015