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TPS65010RGZT Datasheet(PDF) 50 Page - Texas Instruments

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Part # TPS65010RGZT
Description  Power and Battery Management IC for Li-Ion Powered Systems
Download  63 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS65010RGZT Datasheet(HTML) 50 Page - Texas Instruments

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TPS65010
SLVS149C – JUNE 2003 – REVISED SEPTEMBER 2015
www.ti.com
8.2.1.2.2
Output Capacitor Selection
The advanced fast response voltage mode control scheme of the inductive converters implemented in the
TPS65010 allow the use of small ceramic capacitors with a typical value of 22 µF for the main converter and 10
µF for the core converter without having large output voltage under and overshoots during heavy load transients.
Ceramic capacitors having low ESR values have the lowest output voltage ripple and are recommended. If
required tantalum capacitors with an ESR < 100
ΩR may be used as well.
Refer to Table 30 for recommended components.
If ceramic output capacitors are used, the capacitor RMS ripple current rating always meet the application
requirements. Just for completeness the RMS ripple current is calculated as:
(5)
At nominal load current, the inductive converters operate in PWM mode and the overall output voltage ripple is
the sum of the voltage spike caused by the output capacitor ESR plus the voltage ripple caused by charging and
discharging the output capacitor:
(6)
Where the highest output voltage ripple occurs at the highest input voltage VI.
At light load currents, the converters operate in power save mode and the output voltage ripple is independent of
the output capacitor value. The output voltage ripple is set by the internal comparator thresholds. The typical
output voltage ripple is 1% of the nominal output voltage. If the output voltage for the core converter is
programmed to its lowest voltage of 0.85 V, the output capacitor must be increased to 22 µF for low output
voltage ripple. This is because the current in the inductor decreases slowly during the off-time and further
increases the output voltage even when the PMOS is off. This effect increases with low output voltages.
8.2.1.2.3
Input Capacitor Selection
Because of the nature of the buck converter, having a pulsating input current a low ESR input capacitor is
required for best input voltage filtering and minimizing the interference with other circuits caused by high input
voltage spikes. The main converter needs a 22-µF ceramic input capacitor and the core converter a 10-µF
ceramic capacitor. The input capacitor for the main and the core converter can be combined and one 22-µF
capacitor can be used instead, because the two converters operate with a phase shift of 270 degrees. The input
capacitor can be increased without any limit for better input voltage filtering. The VCC pin must be separated
from the input for the main and the core converter. A filter resistor of up to 100R and a 1-µF capacitor is used for
decoupling the VCC pin from switching noise.
Table 30. Possible Capacitors
CAPACITOR VALUE
CASE SIZE
COMPONENT SUPPLIER
COMMENTS
22 µF
1206
TDK C3216X5R0J226M
Ceramic
22 µF
1206
Taiyo Yuden JMK316BJ226ML
Ceramic
22 µF
1210
Taiyo Yuden JMK325BJ226MM
Ceramic
50
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