MAX1823AEUB+ Maxim Integrated Products, MAX1823AEUB+ Datasheet - Page 10

• Manufacturer Part Number: MAX1823AEUB+
• Description: IC SW USB DUAL W/FB 10-UMAX
• Manufacturer: Maxim Integrated Products

Specifications of MAX1823AEUB+

• Applications: USB, Peripherals
• Current - Supply: 50µA
• Voltage - Supply: 4 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 10-MSOP, Micro10™, 10-uMAX, 10-uSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

After the fault condition is removed, the FAULT_ output
deasserts after a 20ms delay. Ensure that the MAX1823
has adequate input bypass capacitance to prevent
glitches from triggering FAULT_ outputs. Input glitches
greater than 0.2V/µs may cause erroneous FAULT_
indications.
The MAX1823 limits switch current in three ways. When
ON_ is deasserted (high for MAX1823/MAX1823A, low
for MAX1823B/MAX1823H), the switch is off and leak-
age dominates the residual output current. When ON_
is asserted (low for MAX1823/MAX1823A, high for
MAX1823B/MAX1823H), the switch supplies a continu-
ous output current of at least 720mA. When the output
current exceeds the 0.9A threshold, the MAX1823 lim-
its the current depending on the output voltage. For
V
MAX1823 regulates the output current to 0.9A. For
Dual USB Switch with Fault
Blanking and Autoreset
10
Figure 2. Functional Diagram
OUT_
______________________________________________________________________________________
greater than 1V (current-limit mode), the
4V TO 5.5V
0.1 F
IN_
*(ONB)
*(ONA)
ONA
ONB
INA
INB
*( ) ARE FOR THE MAX1823B/MAX1823H.
Behavior During Current Limit
and Fault Blanking
MAX1823B/MAX1823H
MAX1823/MAX1823A
CHARGE
CHARGE
PUMP
PUMP
UVLO
25kHz
BIAS
OSC
REF
SHUTDOWN
THERMAL
TIMER
20ms
V
pulses the switch, decreasing the current to 0.35A
(Table 1). Note that a thermal overload may result from
either of these high-current conditions.
The MAX1823 switches may enter current limit in nor-
mal operation when powering up or driving heavy
capacitive loads. To differentiate these conditions from
short circuits or sustained overloads that may damage
the device, the MAX1823 has an independent fault-
blanking circuit in each switch. When a load transient
causes the device to enter current limit, an internal
counter starts to monitor the duration of the fault. For
load faults exceeding 20ms fault-blanking time, the
switch turns off, the FAULT_ signal asserts low, and the
device enters autoreset mode (see the Autoreset Mode
section). Only current-limit and short-circuit faults are
blanked. Thermal-overload faults and input voltage
drops below the UVLO threshold immediately cause
the switch to turn off and FAULT_ to assert low.
OUT_
less than 1V (short-circuit mode), the MAX1823
LOGIC
FAULT
25mA
25mA
ILIM
ILIM
FAULTA
FAULTB
INA
GND
INB
1 F
1 F
OUTA
OUTB
RMS