Datasheet
SLVS485 − AUGUST 2003
www.ti.com
16
APPLICATION INFORMATION
SW
CDRH6D28-5R0
Si5475DC
MBRM120LT3
EN
GND
FB
VIN
ISENSE
Li-lon
3.3 V to 4.2 V
C
IN
10 µF
TPS64202
R
(ISENSE)
= 33 mΩ
R1
620 kΩ
R2
360 kΩ
Cff
4.7 pF
Co
47 mF PosCap
6TPA47M
3.3 V / 2 A
1
2
3
6
5
4
5 µH
Figure 19. Application For a Li-Ion to 3.3-V / 2-A Conversion
The TPS64202 was used for this application because for a low input to output voltage difference, the switching
frequency is determined by the minimum off-time. The TPS64202 with its minimum off-time of 300 ns provides
a higher switching frequency compared to the other members of the TPS6420x family.
SW
CDRH6D28-5R0
Si5475DC
MBRM120LT3
EN
GND
FB
VIN
ISENSE
Li-lon
3.3 V to 4.2 V
C
IN
10 µF
TPS64202
R1
620 kΩ
R2
360 kΩ
Cff
4.7 pF
Co
47 mF PosCap
6TPA47M
3.3 V / 2 A
R3
150 Ω
C3
470 pF
1
2
3
6
5
4
5 µH
Figure 20. Application For a Li-Ion to 3.3-V / 2-A Conversion Using r
DS(on)
Sense and RC Snubber
Network For the Schottky Diode