Application Notes
PT6460 & PT6470 Series
Tantalum Capacitors( Optional Output Capacitors)
Capacitor Recommendations for the
PT6460 & PT6470 Regulator Series
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
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
dissipation, and lower ripple current capability. The TAJ
series is less reliable than the AVX TPS series when deter-
mining power dissipation capability. Tantalum or Oscon®
types are recommended for applications where ambient
temperatures fall below 0 °C.
Input Capacitor:
The recommended input capacitor is determined by a
minimum of 470 µF capacitance and 700 mA minimum
ripple current rating.
Ripple current and <100 mΩ equivalent series resistance
(ESR) values are the major considerations, along with
temperature, when when designing with different types
of capacitors. Tantalum capacitors have a recommended
minimum voltage rating of 2× (maximum DC voltage +
AC ripple). This is necessary to insure reliability for
input voltage bus applications.
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.
Output Capacitors (Optional):
The ESR of the capacitors should be less than 150 mΩ.
Electrolytic capacitors have marginal ripple performance at
frequencies greater than 400 kHz but excellent low fre-
quency transient response. 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. Preferred low
ESR type capacitor part numbers are identified in Table 2-1.
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 100kHz) are critical parameters necessary to insure both
optimum regulator performance and long capacitor life.
Table 2-1: Input/Output Capacitors
Capacitor Vendor/
Series
Capacitor Characteristics
Quantity
Working
Voltage
Value(µF)
(ESR) Equivalent
Series Resistance
Maximum Ripple
Current @105°C
(Irms)
Physical Size
(mm)
Input
Bus
Output
Bus
Vendor Part Number
Panasonic
FC (Radial)
16 V
10 V
470
560
0.09 Ω
0.09 Ω
755 mA
755 mA
10x12.5
10×12.5
1
1
1
1
EEUFC1C471
EEUFC1A561
25 V
35 V
470
470
0.08 Ω
0.06 Ω
850 mA
1100 mA
10x10.2
12.5×13.5
1
1
1
1
EEVFK1E471P
EEVFK1V471Q
FK (SMT)
United Chemi-con
LXZ/LXV
16 V
10 V
10 V
470
680
680
0.090 Ω
0.090 Ω
0.015 Ω
760 mA
770 mA
4735 mA
10x12.5
10x12.5
10×10.5
1
1
1
1
1
1
LXZ16VB471M10X12LL
LXZ10VB681M10X12LL
10FX680M
FX
Nichicon PL/PM
16 V
16 V
330
470
0.12÷2=0.06 Ω
0.09 Ω
745 mA
770 mA
10x12.5
10x15
2
1
1
1
UPM1C331MPH6
UPM1C 471MPH6
NX Series (SMT)
10 V
330
0.024 Ω
3770 mA
10x8
2
1
PNX1A330MCAR1GS
Sanyo-Os-con SP
SVP (SMT)
10 V
10 V
470
560
0.015 Ω
0.013 Ω
>4500 mA
>5200 mA
10×10.5
11×12.7
1
1
1
1
10SP470M
10SVP560M
AVX Tantalum
TPS (SMT)
10 V
10 V
470
470
0.045 Ω
0.060 Ω
1723 mA
1826 mA
7.3L×5.7W
×4.1H
1
1
1
1
TPSE477M010R0045
TPSV477M010R0060
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
2
2
1
1
T520X337M010AS
T530X337M010AS
Sprague Tantalum
594D (SMT)
10 V
680
0.090 Ω
1660 mA
7.2L×6W
×4.1H
1
1
595D687X0010R2T
For technical support and more information, see inside back cover or visit www.ti.com
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