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| 型号： | LM3352MTC-3.0/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHED CAPACITOR REGULATOR, 1350 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | 1.10 MM HEIGHT, TSSOP-16 |
| 文件页数： | 12/12页 |
| 文件大小： | 545K |
| 代理商： | LM3352MTC-3.0/NOPB |
Filter Capacitor Selection (Continued)
yuden which are suitable for use with regulators. Ceramics
are taller and larger than the tantalums of the same capaci-
tance value.
iii) Polymer Electrolytic
Polymer electrolytic is a third suitable technology. Polymer
capacitors provide some of the best features of both the
ceramic and the tantalum technologies. They provide very
low ESR values while still achieving high capacitance val-
ues. However, their ESR is still higher than the ceramics,
and their capacitance value is lower than the tantalums of
the same size. Polymers offer good frequency stability (com-
parable to ceramics) and good temperature stability (compa-
rable to tantalums). The Aluminum Polymer Electrolytics
offered by Cornell-Dubilier and Panasonic, and the POS-
CAPs offered by Sanyo fall under this category.
Table 1 compares the features of the three capacitor tech-
nologies.
TABLE 1. Comparison of Capacitor Technologies
Ceramic
Tantalum
Polymer
Electrolytic
ESR
Lowest
High
Low
Relative Height
Low for Small Values (<10 F); Taller for
Higher Values
Lowest
Low
Relative Footprint
Large
Small
Largest
Temperature Stability
X7R/X5R-Acceptable
Good
Frequency Stability
Good
Acceptable
Good
V
OUT Ripple Magnitude @ <50 mA
Low
High
Low
V
OUT Ripple Magnitude @ >100 mA
Low
Slightly Higher
Low
dv/dt of V
OUT Ripple @ All Loads
Lowest
High
Low
b) CAPACITOR SELECTION
i) Output Capacitor (C
OUT)
The output capacitor C
OUT directly affects the magnitude of
the output ripple voltage so C
OUT should be carefully se-
lected. The graphs titled V
OUT Ripple vs. COUT in the Typical
Performance Characteristics section show how the ripple
voltage magnitude is affected by the C
OUT value and the
capacitor technology. These graphs are taken at the gain at
which worst case ripple is observed. In general, the higher
the value of C
OUT, the lower the output ripple magnitude. At
lighter loads, the low ESR ceramics offer a much lower V
OUT
ripple than the higher ESR tantalums of the same value. At
higher loads, the ceramics offer a slightly lower V
OUT ripple
magnitude than the tantalums of the same value. However,
the dv/dt of the V
OUT ripple with the ceramics and polymer
electrolytics is much lower than the tantalums under all load
conditions. The tantalums are suggested for very low profile,
small size applications. The ceramics and polymer electro-
lytics are a good choice for low ripple, low noise applications
where size is less of a concern.
ii) Input Capacitor (C
IN)
The input capacitor C
IN directly affects the magnitude of the
input ripple voltage, and to a lesser degree the V
OUT ripple.
A higher value C
IN will give a lower VIN ripple. To optimize
low input and output ripple as well as size a 15 F polymer
electrolytic, 22 F ceramic, or 33 F tantalum capacitor is
recommended. This will ensure low input ripple at 200 mA
load current. If lower currents will be used or higher input
ripple can be tolerated then a smaller capacitor may be used
to reduce the overall size of the circuit. The lower ESR
ceramics and polymer electrolytics achieve a lower V
IN
ripple than the higher ESR tantalums of the same value.
Tantalums make a good choice for small size, very low
profile applications. The ceramics and polymer electrolytics
are a good choice for low ripple, low noise applications
where size is less of a concern. The 15 F polymer electro-
lytics are physically much larger than the 33 F tantalums
and 22 F ceramics.
iii) C
FIL
A 1 F, XR7 ceramic capacitor should be connected to pin
C
FIL. This capacitor provides the filtering needed for the
internal supply rail of the LM3352.
Of the different capacitor technologies, a sample of vendors
that have been verified as suitable for use with the LM3352
are shown in Table 2.
TABLE 2. Capacitor Vendor Information
Manufacturer
Tel
Fax
Website
Ceramic
Taiyo-yuden
(408) 573-4150
(408) 573-4159
www.t-yuden.com
AVX
(803) 448-9411
(803) 448-1943
www.avxcorp.com
Tantalum
Sprague/Vishay
(207) 324-4140
(207) 324-7223
www.vishay.com
Nichicon
(847) 843-7500
(847) 843-2798
www.nichicon.com
Polymer Electrolytic
Cornell-Dubilier (ESRD)
(508) 996-8561
(508) 996-3830
www.cornell-dubilier.com
Sanyo (POSCAP)
(619) 661-6322
(619) 661-1055
www.sanyovideo.com
LM3352
www.national.com
9
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