Datasheet

PTH04040W
SLTS238C –SEPTEMBER 2005–REVISED JUNE 2010 www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
T
A
= 25°C, V
I
= 5 V, V
O
= 2.5 V, C
I
= 1000 µF, C
O
= 660 µF, and I
O
= I
O
max (unless otherwise stated)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
C
I
External input capacitance 940
(8)
µF
Nonceramic 660
(9)
14000
(10)
Capacitance value µF
C
O
External output capacitance Ceramic 400
Equivalent series resistance (nonceramic) 2
(11)
mΩ
2.1
MTBF Reliability Per Bellcore TR-332 50% stress, T
A
= 40°C, ground benign
10
6
Hrs
(8) A minimum capacitance of 940 mF is required at the input for proper operation. The capacitance must be rated for a minimum of
400 mArms of ripple current.
(9) 660 mF of output capacitance is required for proper operation. Additional capacitance at the load will improve transient response.
(10) This is the calculated maximum. The minimum ESR requirement often results in a lower value. See the Capacitor Application
Information section for further guidance.
(11) This is the typical ESR for all the electrolytic (nonceramic) output capacitance. Use 4 mΩ as the minimum when using max-ESR values
to calculate.
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