Datasheet
MAX1823/MAX1823A/MAX1823B/MAX1823H
Dual USB Switch with Fault
Blanking and Autoreset
8 _______________________________________________________________________________________
Pin Description
PIN NAME FUNCTION
1
ONA
*(ONA)
C ontr ol Inp ut for S w i tch A. C an b e d r i ven hi g her than IN_ w i thout d am ag e. A l og i c l ow tur ns sw i tch A on for
the M AX 1823/M AX 1823A, and a l og i c hi g h tur ns sw i tch A on for the M AX 1823B/M AX 1823H .
2, 3, 4
INA, IN,
INB
Power Input. Connect all IN_ pins together, and bypass with a 0.1µF capacitor to ground. Load
conditions may require additional bulk capacitance to prevent the input from being pulled down.
5
ONB
*(ONB)
Control Input for Switch B. Can be driven higher than IN_ without damage. A logic low turns switch B
on for the M AX 1823/M AX 1823A, and a logic high turns switch B on for the M AX 1823B/M AX 1823H .
6 FAULTB
Fault-Indicator Output for Switch B. This open-drain output goes low when switch B is in thermal
shutdown or UVLO or in a sustained (>20ms) current-limit or short-circuit condition.
7 OUTB
Power Output for Switch B. Connect a 1µF capacitor from OUTB to ground. Load condition may
require additional bulk capacitance.
8 GND Ground
9 OUTA
Power Output for Switch A. Connect a 1µF capacitor from OUTA to ground. Load condition may
require additional bulk capacitance.
10 FAULTA
Fault-Indicator Output for Switch A. This open-drain output goes low when switch A is in thermal
shutdown or UVLO or in a sustained (>20ms) current-limit or short-circuit condition.
1ms/div
SWITCH TURN-OFF TIME
(t
OFF
+ t
FALL
)
A: V
ONA
, 5V/div
B: V
OUTA
, 2V/div
A
B
MAX1823 toc22
0
0
500µs/div
STARTUP TIME
(TYPICAL USB APPLICATION)
A: V
ONA
, 5V/div
B: V
FAULTA
, 5V/div
A
B
MAX1823 toc23
0
5V
C
D
0
0
C: V
OUTA
, 2V/div
D : I
OUTA
, 0.5A/div
Typical Operating Characteristics (continued)
(Circuit of Figure 1, V
IN
= V
INA
= V
INB
= 5V, ON_ = GND (MAX1823/MAX1823A), ON_ = IN_ (MAX1823B/MAX1823H), T
A
= +25°C,
unless otherwise noted.)
*() are for the MAX1823B/MAX1823H only.