Adjustable Current-Limit Switches
Description
19-4814; Rev 0; 7/09
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250mA to 1.
5A, Adjustable Current-Limit Switches
General Description
The MAX14523A/MAX14523AL/MAX14523B/MAX14523C programmable current-limit switches feature internal current limiting to prevent damage to host devices due to faulty load conditions.
These current-limit switches feature a low 70mΩ on-resistance and operate from a +1.
7V to +5.
5V input voltage range.
The current limit is adjustable from 250mA to 1.
5A, making these devices ideal for SDIO (secure digital input/output) and other load-switching applications.
Each device in the family handles an overcurrent event differently depending on the option selected.
The MAX14523A/MAX14523AL go into an autoretry mode, the MAX14523B latches off the switch, and the MAX14523C features a continuous current-limit mode.
Additional safety features include thermal shutdown to prevent overheating and reverse-current blocking to prevent current from being driven back into the source.
The MAX14523A/MAX14523AL/MAX14523B/MAX14523C are available in a tiny 8-pin, 3mm x 3mm, TDFN package and operate over the -40°C to +125°C automotive temperature range.
♦ Adjustable Current-Limit Threshold ♦ Low-Dropout Voltage (70mV at 1A Load Current) ♦ Short-Circuit Protection ♦ Thermal-Shutdown Protection ♦ Reverse-Current Protection ♦ 170µA (typ) Supply Current ♦ Shutdown Reverse Current, 0.
6µA (max) ♦ +1.
7V to +5.
5V Supply Voltage Range ♦ Tiny 8-Pin, 3mm x 3mm, TDFN Package
Features
♦ Accurate (±10%) Overload Current Limit
MAX14523A/MAX14523AL/MAX14523B/MAX14523C
Typical Operating Circuit
BIAS VOLTAGE POWER SUPPLY IN 1μF CHARGE PUMP OUT 1μF LOAD
Applications
SDIO Ports USB Ports Notebook VGA Ports GPS Cell Phones MP3 Players UTCA/ATCA Platforms
GND RSETI μP VPULLUP CURRENT REFERENCE
CONTROL LOGIC
10kΩ FLAG ON(ON)* N.
C.
MAX14523A MAX14523AL MAX14523B MAX14523C
Pin Configuration appears at end of data sheet.
*ON FOR THE MAX14523AL ONLY.
Ordering Information/Selector Guide
PART MAX14523AATA+ MA...
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