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TPS63021DSJT Datasheet(HTML) 16 Page - Texas Instruments
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2 x V
x f x L
0.8 x V
2 x V
x f x L
SLVS916 – APRIL 2010
maximum input voltage. In Equation 3 the minimum inductance, L2, for boost mode operation is calculated. The
recommended minimum inductor value is either L1 or L2, whichever is higher. As an example, a suitable inductor
for generating 3.3V from a Li-Ion battery with a battery voltage range from 2.5V up to 4.2V is 1.5mH. The
recommended inductor value range is between 1.5mH and 4.7mH. This means that at high voltage conversion
rates, higher inductor values offer better performance.
With the chosen inductance value, the peak current for the inductor in steady state operation can be calculated.
Equation 4 shows how to calculate the peak current I1 in step down mode operation and Equation 5 shows how
to calculate the peak current I2 in boost mode operation.
In both equations, f is the minimum switching frequency. V
is the minimum input voltage. The critical current
value for selecting the right inductor is the higher value of I1 and I2 . Consideration must be given to the load
transients and error conditions that can cause higher inductor currents. This must be taken into account when
selecting an appropriate inductor. The following inductor series from different suppliers have been used with
Table 2. List of Inductors
At least a 10mF input capacitor is recommended to improve transient behavior of the regulator and EMI behavior
of the total power supply circuit. A ceramic capacitor placed as close as possible to the VIN and PGND pins of
the IC is recommended.
To make sure that the internal control circuits are supplied with a stable low noise supply voltage, a capacitor can
be connected between VINA and GND. Using a ceramic capacitor with a value of 0.1mF is recommended. The
value of this capacitor should not be higher than 0.22mF. If no capacitor is used at VINA, VINA should be
connected directly to VIN.
For the output capacitor, use of small ceramic capacitors placed as close as possible to the VOUT and PGND
pins of the IC is recommended. If, for any reason, the application requires the use of large capacitors which can
not be placed close to the IC, use a smaller ceramic capacitor in parallel to the large capacitor. The small
capacitor should be placed as close as possible to the VOUT and PGND pins of the IC.
To get an estimate of the recommended minimum output capacitance, Equation 6 can be used.
A capacitor with a value in the range of the calculated minimum should be used. This is required to maintain
control loop stability. There are no additional requirements regarding minimum ESR. There is also no upper limit
for the output capacitance value. Larger capacitors will cause lower output voltage ripple as well as lower output
voltage drop during load transients.
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