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LMZ35003RKGR Datasheet(PDF) 11 Page - Texas Instruments

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No. de pieza LMZ35003RKGR
Descripción Electrónicos  2.5A SIMPLE SWITCHER짰 Power Module with 7V-50V Input in QFN Package
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Fabricante Electrónico  TI1 [Texas Instruments]
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LMZ35003RKGR Datasheet(HTML) 11 Page - Texas Instruments

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LMZ35003
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SNVS988 – JULY 2013
CAPACITOR RECOMMENDATIONS FOR THE LMZ35003 POWER SUPPLY
Capacitor Technologies
Electrolytic, Polymer-Electrolytic Capacitors
When using electrolytic capacitors, high-quality, computer-grade electrolytic capacitors are recommended.
Polymer-electrolytic type capacitors are recommended for applications where the ambient operating temperature
is less than 0°C. The Sanyo OS-CON capacitor series is suggested due to the lower ESR, higher rated surge,
power dissipation, ripple current capability, and small package size. Aluminum electrolytic capacitors provide
adequate decoupling over the frequency range of 2 kHz to 150 kHz, and are suitable when ambient temperatures
are above 0°C.
Ceramic Capacitors
The performance of aluminum electrolytic capacitors is less effective than ceramic capacitors above 150 kHz.
Multilayer ceramic capacitors have a low ESR and a resonant frequency higher than the bandwidth of the
regulator. They can be used to reduce the reflected ripple current at the input as well as improve the transient
response of the output.
Tantalum, Polymer-Tantalum Capacitors
Polymer-tantalum type capacitors are recommended for applications where the ambient operating temperature is
less than 0°C. The Sanyo POSCAP series and Kemet T530 capacitor series are recommended rather than many
other tantalum types due to their lower ESR, higher rated surge, power dissipation, ripple current capability, and
small package size. Tantalum capacitors that have no stated ESR or surge current rating are not recommended
for power applications.
Input Capacitor
The LMZ35003 requires a minimum input capacitance of 4.4
μF of ceramic type. The voltage rating of input
capacitors must be greater than the maximum input voltage. The ripple current rating of the capacitor must be at
least 450 mArms. Table 1 includes a preferred list of capacitors by vendor.
Output Capacitor
The output capacitance of the LMZ35003 can be comprised of either all ceramic capacitors, or a combination of
ceramic and bulk capacitors. The required output capacitance must include at least 100 µF of ceramic type (or 2
x 47 µF). When adding additional non-ceramic bulk capacitors, low-ESR devices like the ones recommended in
Table 1 are required. Additional capacitance above the minimum is determined by actual transient deviation
requirements. Table 1 includes a preferred list of capacitors by vendor.
Table 1. Recommended Input/Output Capacitors(1)
CAPACITOR CHARACTERISTICS
WORKING
VENDOR
SERIES
PART NUMBER
CAPACITANCE
ESR (2)
VOLTAGE
(µF)
(m
Ω)
(V)
Murata
X5R
GRM31CR61H225KA88L
50
4.7
2
TDK
X5R
C3216X5R1H475K
50
4.7
2
Murata
X5R
GRM32ER61E226K
16
22
2
TDK
X5R
C3225X5R0J476K
6.3
47
2
Murata
X5R
GRM32ER60J476M
6.3
47
2
Sanyo
POSCAP
16TQC68M
16
68
50
Sanyo
POSCAP
6TPE100MI
6.3
100
25
Kemet
T530
T530D227M006ATE006
6.3
220
6
(1)
Capacitor Supplier Verification, RoHS, Lead-free and Material Details
Consult capacitor suppliers regarding availability, material composition, RoHS and lead-free status, and manufacturing process
requirements for any capacitors identified in this table.
(2)
Maximum ESR @ 100 kHz, 25°C.
Copyright © 2013, Texas Instruments Incorporated
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