Datasheet

OS_typ
ILIM_XX
50,500
I (mA) =
(R (kΩ) + 0.1)
0
500
1000
1500
2000
2500
3000
3500
0 80 160 240 320 400 480 560 640 720 800
Current-Limit Programming Resistor (kΩ)
OUT Short Circuit Current Limit (mA)
Full R
ILIM_XX
Range
G018
TPS2543
SLVSBA6 –FEBRUARY 2012 www.ti.com
Current-Limit Settings
The TPS2543 has two independent current limit settings that are each programmed externally with a resistor.
The ILIM_HI setting is programmed with R
ILIM_HI
connected between ILIM_HI and GND. The ILIM_LO setting is
programmed with RILIM_LO connected between ILIM_LO and GND. Consult the Device Truth Table (Table 2) to
see when each current limit is used. Both settings have the same relation between the current limit and the
programming resistor.
R
ILIM_LO
is optional and the ILIM_LO pin may be left unconnected if the following conditions are met:
1. ILIM_SEL is always set high
2. Load Detection - Port Power Management is not used
3. Mouse / Keyboard wake function is not used
If conditions 1 and 2 are met but the mouse / keyboard wake function is also desired, it is recommended to use
R
ILIM_LO
< 80.6 kΩ.
The following equation programs the typical current limit:
(1)
R
ILIM_XX
corresponds to either R
ILIM_HI
or R
ILIM_LO
as appropriate.
TYPICAL CURRENT LIMIT SETTING
vs
PROGRAMMING RESISTOR
Figure 34.
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