PTH04040W

SLTS238C – SEPTEMBER 2005 – REVISED JUNE 2010

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ELECTRICAL CHARACTERISTICS (continued)

TA = 25°C, VI = 5 V, VO = 2.5 V, CI = 1000 µF, CO = 660 µF, and IO = IOmax (unless otherwise stated)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

CI

External input capacitance

940(8)

µF

Nonceramic

660(9)

14000(10)

Capacitance value

µF

CO

External output capacitance

Ceramic

400

Equivalent series resistance (nonceramic)

2(11)

m

Ω

2.1

MTBF

Reliability

Per Bellcore TR-332 50% stress, TA = 40°C, ground benign

106Hrs

(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 m

Ω as the minimum when using max-ESR values

to calculate.

4

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