19-4814; Rev 1; 1/11
250mA to 1.5A, Adjustable
Current-Limit Switches
Features
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.
♦ Accurate (±10%) Overload Current Limit
♦ 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
Typical Operating Circuit
BIAS
VOLTAGE
IN
POWER
SUPPLY
OUT
1μF
LOAD
1μF
Applications
CHARGE
PUMP
SDIO Ports
RSETI
USB Ports
μP
CURRENT
REFERENCE
VPULLUP
CONTROL
LOGIC
Notebook VGA Ports
10kΩ
GPS
FLAG
Cell Phones
N.C.
ON(ON)*
MP3 Players
UTCA/ATCA Platforms
GND
MAX14523A
MAX14523AL
MAX14523B
MAX14523C
*ON FOR THE MAX14523AL ONLY.
Pin Configuration appears at end of data sheet.
Ordering Information/Selector Guide
PART
PIN-PACKAGE
TOP MARK
ON POLARTIY
OVERCURRENT RESPONSE
MAX14523AATA+
8 TDFN-EP*
BLO
Active-High
Autoretry
MAX14523ALATA+**
8 TDFN-EP*
BLP
Active-Low
Autoretry
MAX14523BATA+
8 TDFN-EP*
BLQ
Active-High
Latch-Off
MAX14523BATA/V+T
8 TDFN-EP*
BLQ
Active-High
Latch-Off
MAX14523CATA+
8 TDFN-EP*
BLS
Active-High
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.
/V denotes an automotive qualified part.
*EP = Exposed pad.
**Future product—contact factory for availability.
________________________________________________________________ Maxim Integrated Products
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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MAX14523A/MAX14523AL/MAX14523B/MAX14523C
General Description
