Application Notes
ATH10T033 & ATH10T05 Series
over many other tantalum types due to their higher rated
surge, power dissipation, and ripple current capability. As a
caution the TAJ series by AVX is not recommended. This
series has considerably higher ESR, reduced power dissipa-
tion, and lower ripple current capability. The TAJ series
is less reliable than the AVX TPS series when determin-
ing power dissipation capability. Tantalum or Oscon®
types are recommended for applications where ambient
temperatures fall below 0 °C.
ATH10T033/T05: Capacitor Recommendations
Input Capacitor
The recommended input capacitor(s) is determined by
330 µF minimum capacitance, and 500 mA rms mini-
mum ripple current rating.
Ripple current and <150 mΩ equivalent series resistance
(ESR) values are the major considerations, along with
temperature, when designing with different types of capaci-
tors. Tantalum capacitors have a recommended minimum
voltage rating of twice 2× (the maximum DC voltage +
AC ripple). This is standard practice for tantalum capaci-
tors to insure reliability.
Ceramic Capacitors
Ceramic capacitors will compliment electrolytic types.
Adding 10 µF to 47 µF of ceramic capacitance will reduce
ripple on the input and output bus. Output ripple and
transient measurement accuracy is improved by measur-
ing directly across a 10 µF ceramic capacitor.
Output Capacitors (Optional)
The ESR of the bulk (non-ceramic) capacitors must be
equal to, or less than 150 mΩ. Electrolytic capacitors
have marginal ripple performance at frequencies greater
than 400 kHz but excellent low frequency transient re-
sponse. Above the ripple frequency, ceramic capacitors are
necessary to improve the transient response and reduce
any high frequency noise components apparent during
higher current excursions.
Capacitor Table
Table 2-1 identifies the characteristics of capacitors from a
number of vendors with acceptable ESR and ripple current
(rms) ratings. The number of capacitors required at both
the input and output buses is identified for each capacitor
type.
This is not an extensive capacitor list. Capacitors from other
vendors are available with comparable specifications. Those listed
are for guidance. The RMS ripple current rating and ESR
(at 100 kHz) are critical parameters necessary to insure both
optimum regulator performance and long capacitor life.
Tantalum Capacitors
Tantalum type capacitors can be used for the output but
only the AVX TPS, Sprague 593D/594/595 or Kemet
T495/T510 series. These capacitors are recommended
Table 1: Input/Output Capacitors
Capacitor Vendor/
Series
Capacitor Characteristics
Quantity
Working
Voltage
Value (µF)
(ESR) Equivalent
Series Resistance Current @105 °C
(Irms)
Max. Ripple
Physical Size
(mm)
Input
Bus
Output
Bus
Vendor Part Number
Panasonic (FC Radial)
WA (SMT.)
FK (SMT.)
10 V
10 V
25 V
16 V
330
330
470
330
0.117 Ω
0.022 Ω
0080 Ω
0.150 Ω
555 mA
4500 mA
850 mA
670 mA
8×10
1
1
1
1
1
1
1
1
EEUFC1A331
10×10.2
10×10.2
10×10.2
EEFWA1A331P
EEVFK1E471P
EEVFC1C331P
FC (SMT)
United Chemi-con
PXA (SMT)
PS
10 V
16 V
10 V
16 V
330
330
390
330
0.024 Ω
0.014 Ω
0.018 Ω
0.120 Ω
3770 mA
5050 mA
3710 mA
555 mA
10×7.7
10×12.5
8×10.5
8×12.5
1
1
1
1
1
1
1
1
PXA10VC331MJ80TP
16PS330MJ12
10FX390M
FX
LXZ Series
LXZ16VB331M8X12LL
Nichicon (WG)
HD Series
PM Series
25 V
16 V
16 V
330
330
330
0.150 Ω
0.072 Ω
0.120 Ω
670 mA
760 mA
625 mA
10×10
8×11.5
10×12.5
1
1
1
1
1
1
UWG1E331MNR1GS
UHD1A331MPR
UPM1C331MPH6
Sanyo-Os-con (SP)
SVP (SMT)
10 V
10 V
470
330
0.015 Ω
0.017 Ω
>4500 mA
>3950mA
10×10.5
8×12
1
1
1
1
10SP470M
10SVP330M
AVX Tantalum
TPS (SMT.)
10 V
10 V
330
330
0.045 Ω
0.060 Ω
1723 mA
1826 mA
7.3L
×5.7W
×4.1H
1
1
1
1
TPSE337M010R0045
TPSV337M010R0060
Kemet Polymer
Tantalum T520/T530
(SMT)
10 V
10 V
330
330
0.040 Ω
0.015 Ω
1800 mA
>3800 mA
4.3W
×7.3L
×4.0H
1
1
1
1
T520X337M010AS
T530X337M010AS
Sprague Tantalum
595D Series
(SMT)
10 V
10 V
330
330
0.100 Ω
0.045 Ω
1040 mA
2360 mA
7.2L
×6W
×4.1H
1
1
595D337X0010D2T
594D337X0016R2T
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