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TPS65022 Datasheet(PDF) 35 Page - Texas Instruments

Part # TPS65022
Description  Power Management IC for Li-Ion Powered Systems
Download  47 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS65022 Datasheet(HTML) 35 Page - Texas Instruments

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DVout =Vout x
1-
Vout
Vin
L x ¦
x
+ESR
(
)
1
8xC
x
out
¦
I
RMSCout
=V
out
x
1-
V
out
V
in
L x
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x
1
2x
3
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TPS65022
www.ti.com
SLVS667B – JULY 2006 – REVISED JANUARY 2016
If ceramic output capacitors are used, the capacitor RMS ripple current rating always meets the application
requirements. The RMS ripple current is calculated as:
(6)
At nominal load current, the inductive converters operate in PWM mode. 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:
(7)
Where the highest output voltage ripple occurs at the highest input voltage Vin.
At light load currents, the converters operate in PSM and the output voltage ripple is dependent on the output
capacitor value. The output voltage ripple is set by the internal comparator delay and the external capacitor. The
typical output voltage ripple is less than 1% of the nominal output voltage.
8.2.2.3 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. Each DC-DC converter requires a 10-
μF ceramic input capacitor on its input pin VINDCDCx. The
input capacitor is increased without any limit for better input voltage filtering. The VCC pin is separated from the
input for the DC-DC converters. A filter resistor of up to 10R and a 1-
μF capacitor is used for decoupling the VCC
pin from switching noise. Note that the filter resistor may affect the UVLO threshold since up to 3 mA can flow
through this resistor into the VCC pin when all converters are running in PWM mode.
Table 18. Possible Capacitors
CAPACITOR VALUE
CASE SIZE
COMPONENT SUPPLIER
COMMENTS
22
μF
1206
TDK C3216X5R0J226M
Ceramic
22
μF
1206
Taiyo Yuden JMK316BJ226ML
Ceramic
22
μF
0805
TDK C2012X5R0J226MT
Ceramic
22
μF
0805
Taiyo Yuden JMK212BJ226MG
Ceramic
10
μF
0805
Taiyo Yuden JMK212BJ106M
Ceramic
10
μF
0805
TDK C2012X5R0J106M
Ceramic
8.2.2.4 Output Voltage Selection
The DEFDCDC1, DEFDCDC2, and DEFDCDC3 pins are used to set the output voltage for each step-down
converter. See Table 19 for the default voltages if the pins are pulled to GND or to VCC. If a different voltage is
needed, an external resistor divider can be added to the DEFDCDCx pin as shown in Figure 36.
The output voltage of VDCDC3 is set with the I2C interface. If the voltage is changed from the default, using the
DEFCORE register, the output voltage only depends on the register value. Any resistor divider at DEFDCDC3
does not change the voltage set with the register.
Table 19. DCDC1, DCDC2, and DCDC3 Default Voltage Levels
PIN
LEVEL
DEFAULT OUTPUT VOLTAGE
VCC
3.3 V
DEFDCDC1
GND
3 V
VCC
2.5 V
DEFDCDC2
GND
1.8 V
VCC
1.55 V
DEFDCDC3
GND
1.3 V
Copyright © 2006–2016, Texas Instruments Incorporated
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