Datasheet

TPS2044, TPS2054
QUAD POWER-DISTRIBUTION SWITCHES
SLVS174B – JULY 1998 – REVISED FEBRUARY 1999
20
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
low-power bus-powered functions and high-power bus-powered functions
Both low-power and high-power bus-powered functions obtain all power from upstream ports; low-power
functions always draw less than 100 mA, and high-power functions must draw less than 100 mA at powerup
and can draw up to 500 mA after enumeration. If the load of the function is more than the parallel combination
of 44 Ω and 10 µF at power up, the device must implement inrush current limiting (see Figure 32).
IN1
OC1
EN1
OC3
EN3
2
16
13
12
9
15
6
0.1 µF 10 µF
0.1 µF 10 µF
Internal
Function
OUT1
OUT2
Power Supply
3.3 V
IN2
OC2
OC4
14
11
0.1 µF 10 µF
0.1 µF 10 µF
OUT3
OUT4
10
EN2
EN4
3
4
7
8
GND1
GND2
1
5
Internal
Function
Internal
Function
Internal
Function
0.1 µF
10 µF
USB
Control
GND
V
BUS
D–
D+
TPS2044
Figure 32. High-Power Bus-Powered Function