Datasheet
LMZ31520
www.ti.com
SLVSBM9B –OCTOBER 2013–REVISED DECEMBER 2013
Table 3. Recommended Input/Output Capacitors
(1)
CAPACITOR CHARACTERISTICS
WORKING
VENDOR SERIES PART NUMBER
CAPACITANCE ESR
(2)
VOLTAGE
(µF) (mΩ)
(V)
Murata X5R GRM32ER61E226K 25 22 2
TDK X5R C3216X5R1E476M 25 47 2
TDK X5R C3216X5R1C476M 16 47 2
Murata X5R GRM32ER61C476M 16 47 2
TDK X5R C3225X5R0J107M 6.3 100 2
Murata X5R GRM32ER60J107M 6.3 100 2
TDK X5R C3225X5R0J476K 6.3 47 2
Murata X5R GRM32ER60J476M 6.3 47 2
Panasonic EEH-ZA EEH-ZA1E101XP 25 100 30
Kemet T520 T520V107M010ASE025 10 100 25
Panasonic POSCAP 6TPE100MI 6.3 100 25
Panasonic POSCAP 2R5TPE220M7 2.5 220 7
Kemet T530 T530D227M006ATE006 6.3 220 6
Kemet T530 T530D337M006ATE010 6.3 330 10
Panasonic POSCAP 2TPF330M6 2.0 330 6
Panasonic POSCAP 6TPE330MFL 6.3 330 15
(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 @ 100kHz, 25°C.
Transient Response
The LMZ31520 is designed to have an ultra-fast load step response with minimal output capacitance. Table 4
shows the voltage deviation and recovery time for several different transient conditions. Several transient
waveforms are shown in Transient Waveforms
(3)
.
Table 4. Output Voltage Transient Response
C
IN1
= 3 x 47 µF CERAMIC
VOLTAGE DEVIATION (mV)
RECOVERY TIME
V
OUT
(V) V
IN
(V) C
OUT1
Ceramic C
OUT2
BULK
5 A LOAD STEP, 10 A LOAD STEP,
(µs)
(1 A/µs) (1 A/µs)
5 500 µF - 8 15 35
0.6
12 500 µF - 8 15 35
500 µF - 8 15 40
5
500 µF 470 µF 6 12 40
0.9
500 µF - 8 20 40
12
500 µF 470 µF 7 16 40
500 µF - 10 20 40
5
500 µF 330 µF 8 15 40
1.2
500 µF - 10 20 40
12
500 µF 330 µF 8 16 40
500 µF - 10 20 40
5
500 µF 330 µF 8 16 40
1.8
500 µF - 10 20 40
12
500 µF 330 µF 8 16 45
5 500 µF - 12 25 50
3.3
12 500 µF - 12 25 50
(3) Device configured for FCCM mode of operation, (pin 3 connected to pin 19).
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