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1.6 Recommended Output Inductor and Capacitor Values of the DC-DC Converter
Recommended Output Inductor and Capacitor Values of the DC-DC Converter
Output
DC-DC Converter Converter Load Output Inductor Peak
Part # Capacitance, C
Output Voltage Current (mA) Inductance, L ( μ H) Current (mA)
( μ F)
20 292–620 0.33–0.169 26–23
bq25010/15 0.7 V
(1)
50 220 0.47 57.5
100 120 0.82 115
20 120 0.82 23
bq25011
or 3.3 V
(2)
50 47 2.2 57.5
bq25010/15
100 22 4.7 115
20 175 0.56 23
bq25012/17
or 1.8 V
(3)
50 68 1.5 57.5
bq25010/15
100 33 3.3 115
(1)
The product of output inductance L and capacitance C is recommended to be around 10
-10
to better match the built-in
compensator.
(2)
The current ripple is recommended to be about 30% to achieve a high efficiency. Therefore, the inductance can be adjusted
according to the typical load current.
(3)
For bq25010, the output voltage is variable over a wide range. It may require a higher inductance for the worst case to maintain
30% current ripple. Depending on specific applications, an inductance with up to 60% current ripple may be acceptable.
SLUU214A – December 2004 – Revised June 2007 Introduction 5
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