Application Notes
PT7670 Series
Capacitor Recommendations for the PT7670
Series of 30-A Switching Regulators
Tantalum Capacitors( Optional Output 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
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 also less reliable than the AVX TPS series when
determining 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 1,500 µF of capacitance with a ripple cur-
rent rating of 1.1 Arms.
Ripple current and <100 mΩ equivalent series resistance
(ESR) values are the major considerations, along with
temperature, when designing with different types of
capacitors. Tantalum capacitors have a recommended
minimum voltage rating of twice 2 × (the 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 cur-
rent (rms) ratings. The number of capacitors required at
both the input and output buses is identified for each
capacitor type.
Output Capacitors:
The ESR of the required capacitors is less than 100 mΩ.
Electrolytic capacitors have marginal ripple performance
at frequencies greater than 400 kHz but excellent low
frequency 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 100 kHz) 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 Number
Panasonic FK (SMT)
FC (Radial)
25 V
35 V
2200
330
0.038 Ω
0.080 Ω
1800 mA
850 mA
16×16.5
10×10.2
1
—
1
1
EEVFK1E222M
EEVFK1V331P
16 V
16 V
470
1500
0.090 Ω
0.043 Ω
755 mA
1690 mA
10×12.5
16×15
—
1
1
1
EEUFC1C471
EEUFC1C152S
United Chemi -Con
LXZ
25 V
16 V
10 V
330
1500
680
0.090 Ω
0.038 Ω
0.015 Ω
760 mA
1660 mA
4735 mA
10×12.5
12.5×20
10×10.5
—
1
2
1
1
1
LXZ25VB331M10X12LL
LXZ16VB152M12X20LL
10FX680M
FX
Nichicon PL Series
25 V
10 V
10 V
390
1500
330
0.080 Ω
0.050 Ω
0.024 Ω
720 mA
1330 mA
3770 mA
12.5×15
16×15
10×8
—
1
5
1
1
1
UPL1E391MHH6
UPL1A152MHH6
PNX1A331MCR1GS
NX (SMT)
Os-con SP (Radial)
SVP (SMT)
10 V
10 V
470
330
0.015 Ω
0.017 Ω
>4510 mA
>3950 mA
10×10.5
9×12×8.3
3
4
1
1
10SP470M
10SVP330M
AVX Tanatalum
TPS- Series
10 V
10 V
330
330
0.10 Ω
0.06 Ω
1414 mA
1826 mA
7.3L×4.3W
×4.1H
5
5
1
1
TPSV337M010R0100
TPSV337M010R0060
Sprague Tantalum
595D/594D
10 V
10 V
330
680
0.045÷4 =0.011 Ω
0.09 Ω
>4500 mA
>1510 mA
7.3L×5.7W
×4.0H
5
2
1
1
594D337X0010R2T
595D687X0010R2T
Kemet Tantalum
T510/T495 (SMT)
10 V
10 V
330
220
0.035 Ω
0.07÷2 =0.035 Ω
2000 mA
>2000 mA
4.3W×7.3L
×4.0H
5
6
1
2
510X337M010AS
T495X227M010AS
Sanyo Poscap
TPB (SMT)
10 V
220
0.04 Ω
3000 mA
7.2L ×4.3W
×3.1H
6
2
10TPB220M
For technical support and more information, see inside back cover or visit www.ti.com
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