Datasheet

L
L,MAX OUT,MAX
ΔI
I = I +
2
TPS62360, TPS62361B
TPS62362, TPS62363
SLVSAU9C –MAY 2011–REVISED NOVEMBER 2012 www.ti.com
(6)
With:
ΔI
L
= Inductor ripple current (see Equation 5)
I
OUT,MAX
= Maximum output current
Since the inductance can be decreased by saturation effects and temperature impact, the inductor needs to be
chosen to have an effective inductance of at least 0.3µH under temperature and saturation effects.
Table 8 shows a list of inductors that have been used with the TPS6236x. Special care needs to be taken for
choosing the proper inductor, taking e.g. the load profile into account.
Table 8. List of Recommended Inductors
SATURATION
TEMPERATURE
CURRENT
CURRENT DIMENSIONS DC
INDUCTANCE RATING
(1)
RATING
(1)
L x W x H RESISTANCE TYPE MANUFACTURER
[µH] (ΔL/L =30%,
(ΔT =40°C, typ) [mm
3
] [mΩ typ]
typ)
[A]
[A]
1.0 5.4 11.0 4.0 x 4.0 x 2.1 11 XFL4020-102ME1.0 Coilcraft
1.0 4.7 3.6 3.2 x 2.5 x 1.2 34 DFE322512C Toko
1.0 6.0 4.1 4.4 x 4.1 x 1.2 38 SPM4012 TDK
1.0 4.7 3.8 3.2 x 2.5 x 1.2 35 PILE32251B- Cyntec
1R0MS-11
(2)
1.0 4.5 7.0 4.15 x 4.0 x 1.8 24 PIMB042T-1R0MS- Cyntec
11
1.0 4.2 3.7 2.5 x 2.0 x 1.2 38 DFE252012R -H- Toko
1R0N
(2)
0.47 6.6 11.2 4.0 x 4.0 x 1.5 8 XFL4015-471M Coilcraft
0.47 5 4.5 2.5 x 2.0 x 1.2 23 PIFE25201B- Cyntec
R47MS-11
(2)
0.47 5.2 4.4 2.5 x 2.0 x 1.2 27 DFE252012R -H- Toko
R47N
(3)
(1) Excessive inductor temperature might result in a further effective inductance drop which might be below or close to the max. current limit
threshold, I
LIM,max
, depending on the inductor, use case and thermal board design. Proper saturation current rating must be verified,
taking into account the use scenario and thermal board layout.
(2) Product preview, release planned for Q3/4 2012. Contact manufacturer for details.
(3) Under development, typ. data might change. Contact manufacturer for schedule and details.
OUTPUT CAPACITOR SELECTION
The unique hysteretic control scheme allows the use of tiny ceramic capacitors. For best performance, ceramic
capacitors with low ESR values are recommended to achieve high conversion efficiency and low output voltage
ripple. For stable operation, X7R or X5R type capacitors are recommended.
The TPS6236x is designed to operate with a minimum output capacitor of 10µF for a 1µH inductor and 2x10µF
for a 0.47µH inductor, placed at the device's output. In addition, a 0.1µF capacitor can be added to the output to
reduce the high frequency content created by a very sudden load change. For stability, an overall maximum
output capacitance must not be exceeded. See OUTPUT FILTER DESIGN.
Table 7 shows a list of tested capacitors. The TPS6236x is not designed for use with polymer, tantalum, or
electrolytic output capacitors.
OUTPUT FILTER DESIGN
The inductor and the output capacitors create the output filter. The output capacitors consist of C
OUT
and buffer
capacitors at the load, C
LOAD
. See Figure 50. Buffering the load by ceramic capacitors, C
LOAD
, improves the
voltage quality at the load input and the dynamic load step behavior. This is especially true if the trace between
the TPS6236x and the load is longer than the smallest possible.
32 Submit Documentation Feedback Copyright © 2011–2012, Texas Instruments Incorporated
Product Folder Links: TPS62360 TPS62361B TPS62362 TPS62363