Document
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+ MAX14523ALATA+** MAX14523BATA+ MAX14523CATA+ PIN-PACKAGE 8 TDFN-EP* 8 TDFN-EP* 8 TDFN-EP* 8 TDFN-EP* TOP MARK BLO BLP BLQ BLS ON POLARTIY Active-High Active-Low Active-High Active-High OVERCURRENT RESPONSE Autoretry Autoretry Latch-Off Continuous
Note: All devices are specified over the -40°C to +125°C operating temperature range. +Denotes a lead(Pb)-free package/RoHs-compliant package. *EP = Exposed pad. **Future product—contact factory for availability.
________________________________________________________________ Maxim Integrated Products
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For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
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250mA to 1.5A, Adjustable Current-Limit Switches MAX14523A/MAX14523AL/MAX14523B/MAX14523C
ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND.) IN, ON, ON, FLAG, OUT, and SETI to GND .............-0.3V to +6V Current into Any Pin (Except IN, OUT)...............................