PT6360 Datasheet, PDF (6/14 Pages) Texas Instruments – 11 A 12-V Input Adjustable Integrated Switching Regulator

Application Notes
PT6360 Series
Capacitor Recommendations for the PT6360 Series
of Integrated Switching Regulators
Input Capacitor:
The recommended input capacitance is determined by
1.3-A minimum ripple current rating and 560 µF mini-
mum capacitance.
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 2 × (max. dc voltage + ac
ripple). This is necessary to insure reliability for input
voltage bus applications.
Output Capacitors:
The recommended ESR of the output capacitor is 150mΩ.
Electrolytic capacitors have marginal ripple performance
at frequencies greater than 400kHz 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.
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
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.
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
(Equivalent Series Resistance at 100 kHz) are critical param-
eters 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
105 °C Maximum Physical Size
Ripple
(mm)
Current (Irms)
Input
Bus
Output
Bus
Vendor Part Number
Panasonic
FC (Radial)
35 V
25 V
25 V
680
330
1000
0.043 Ω
0.090 Ω
0.038 Ω
1655 mA
755 mA
1690mA
12.5×20
10×12.5
16×15
1
N/R (1)
1
1 EEUFC1V681
1 EEUFC1E331
1 EEUFC1E102S
FC/FK (Surface Mtg)
United Chemi-con
LXZ/LXV Series
MVY (Surface Mtg)
50 V
35 V
35 V
35 V
25 V
1000
680
680
680
330
0073 Ω
0.060 Ω
0.037 Ω
0.068 Ω
0.15 Ω
1610 mA
1100 mA
1660 mA
1050 mA
670 mA
16×16.5
12.5×13.5
12.5×20
10×16
10×10.3
1
1 (2)
1
1 (2)
N/R (1)
1 EEVFK1H102M
1 EEVFK1V681Q (Vo<2.6 V)
1 LXZ35VB681M12X20LL
1 LXV35VB102M16X20LL (Vo<2.6 V)
1 MVY25VC331M10X10TP
Nichicon
PM Series
35 V
25 V
560
1200
0.048 Ω
0.039 Ω
1360 mA
1400 mA
16×15
1
16×15
1
1 UPM1V561MHH6
1 UPM1E122MHH6
35 V
820
0.038 Ω
1370 mA
18×15
1
1 UPM1V821MHH6
Os-con:
SS
10 V
330
SVP (surface Mount)
16 V
330
Old SV Series
AVX Tantalum
TPS (Surface Mtgt)
10 V
330
10 V
330
Kemet Tantalum
T520/T495 Series
(Surface Mount)
10 V
330
6.3 V
220
0.025 Ω
0.016 Ω
0.1 Ω
0.06 Ω
0.040 Ω
0.07 Ω
3500 mA
4700 mA
>2500 mA
>3000 mA
1600 mA
>2000 mA
10×10.5
11×12
N/R (1)
2
7.3L
×5.7W
×4.1H
4.3W
×7.3L
×4.0H
N/R (1)
N/R (1)
N/R (1)
N/R (1)
1 10SS330M (Vo<5.1 V)
1 16SVP330M
1
TPSE337M010R0100 (Vo<5.1 V)
1
TPSV337M010R0060 (Vo<5.1 V)
1 520X337M010AS
1 T495X227M0100AS
Sprague Tantalum
594D Series
(Surface Mount)
10 V
330
0.045 Ω
2360 mA
7.2L
×6W
×4.1H
N/R (1)
1 594D337X0010R2T
(1) N/R –Not recommended. The voltage rating does not meet the minimum operating limits.
(2) Recommended Input capacitor when Vo<2.6 V; lower RMS mA required .
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