Datasheet

1
1
1.114
1.114
ILIM
min
32,114 32,114
R 35.62 k
IOS 600 mA
æ ö
æ ö
= = = W
ç ÷
ç ÷
è ø
è ø
TPS2500, TPS2501
SLVS886C –OCTOBER 2008–REVISED AUGUST 2010 www.ti.com
It is also important to account for I
OS
shifts due to variation in V
IN
and I
AUX
, so by referencing the curves in the
Programming the Current-Limit Threshold Resistor section (Figure 19, specifically) it can be seen that I
OS
will
shift down by ~50 mA from the V
IN
= 3.3 V, I
AUX
= 0 A reference point at our maximum operating conditions of
V
IN
= 4.2 V, I
AUX
= 500 mA. Select R
ILIM
so that the minimum current-limit threshold equals 600 mA to ensure a
minimum I
USB
current-limit threshold of 550 mA.
Choose the next-smaller 1% resistor, which is 34.8 kΩ.
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