MAXIM MAX14523A, MAX14523AL, MAX14523B, MAX14523C User Manual
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.
Applications
SDIO Ports
USB Ports
Notebook VGA Ports
GPS
Cell Phones
MP3 Players
UTCA/ATCA Platforms
Features
♦ 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
MAX14523A/MAX14523AL/MAX14523B/MAX14523C
250mA to 1.5A, Adjustable
Current-Limit Switches
________________________________________________________________
Maxim Integrated Products
1
Ordering Information/Selector Guide
Typical Operating Circuit
19-4814; Rev 1; 1/11
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.
PART PIN-PACKAGE TOP MARK ON POLARTIY OVERCURRENT RES PONSE
MAX14523AATA+ 8 TDFN-EP* BLO Active-High Autoretr y
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
Pin Configuration appears at end of data sheet.
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.
BIAS
VOLTAGE
POWER
SUPPLY
μP
*ON FOR THE MAX14523AL ONLY.
10kΩ
V
PULLUP
1μF
R
SETI
FLAG
ON(ON)*
CURRENT
REFERENCE
OUTIN
CHARGE
PUMP
CONTROL
LOGIC
N.C.
MAX14523A
MAX14523AL
MAX14523B
MAX14523C
GND
LOAD
1μF
MAX14523A/MAX14523AL/MAX14523B/MAX14523C
250mA to 1.5A, Adjustable
Current-Limit Switches
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VIN= +1.7V to +5.5V, R
SETI
= 94.2kΩ, CIN= C
OUT
= 1µF, and TA= TJ= -40°C to +125°C, unless otherwise noted. Typical values
are at V
IN
= +3.3V, TA= +25°C.) (Note 2)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-
layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial
.
(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)................................20mA
Out Short Circuit to GND...................................Internally Limited
Continuous Power Dissipation (T
A
= +70°C) for multilayer board:
TDFN (derate 24.4mW/°C above +70°C)...................1952mW
Operating Temperature Range .........................-40°C to +125°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
PACKAGE THERMAL CHARACTERISTICS (Note 1)
TDFN
Junction-to-Ambient Thermal Resistance (θ
JA
) ...........41°C/W
Junction-to-Case Thermal Resistance (θ
JC
) ..................8°C/W
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
SUPPLY OPERATION
Operating Voltage VIN 1.7 5.5 V
Quiescent Current IQ I
Latchoff Current I
Shutdown Forward Current I
Shutdown Re verse Current I
INTERNAL FET
Switch-On Resistance R
Forward-Current Limit I
(R
+2.48k) × I
SETI
Reverse Bloc king Current
Reverse Blocking Threshold V
FLAG Assertion Drop Voltage
Threshold
ON, ON INPUT
ON, ON Input Leakage I
ON, ON Input Logic-High Voltage V
ON, ON Input Logic-Low Voltage V
Product
LIM
LATCH
SHDN
RSHDN
ON
LIM
- VIN
OUT
V
FA
VON, VON = V
LEAK
IH
IL
= 0A, switch on, V
OUT
V
= 3.3V, I
IN
fault (MAX14523B)
VON = 0V, VON = VIN, V
V
= 0V, VON = VIN, V
ON
5.5V (current into OUT)
VIN = 3.3V, I
R
= 91.78k, VIN - V
SETI
R
= 563.12k , VIN - V
SETI
I
= 250mA to 1500mA,
LIM
- V
V
IN
OUT
V
> VIN + 140mV, after reverse-current-
OUT
limit shutdown
V
- VIN = 300mV, OUT falling until
OUT
switch turns on
Increase (V
asserts, I
OUT
1.6 V
0.4 V
= 3.3V 170 300 μA
IN
= 0A , after an overcurrent
OUT
OUT
= 1V
= 5.5V, V
IN
= 1.7V, V
IN
lower than I
OUT
OUT
= 0V 0.5 7 μA
OUT
=
OUT
70 130 m
LIM
= 1V 1350 1500 1650
= 1V 225 250 275
10 20 μA
0.01 0.6 μA
127.2 141.4 155.5 kV
2 μA
40 95 140 mV
- V
IN
) drop until FLAG
OUT
limiting, VIN = 3.3V
or V
IN
-1 +1 μA
GND
350 mV
mA
MAX14523A/MAX14523AL/MAX14523B/MAX14523C
250mA to 1.5A, Adjustable
Current-Limit Switches
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(VIN= +1.7V to +5.5V, R
SETI
= 94.2kΩ, CIN= C
OUT
= 1µF, and TA= TJ= -40°C to +125°C, unless otherwise noted. Typical values
are at V
IN
= +3.3V, TA= +25°C.) (Note 2)
Note 2: All devices are 100% tested at 125°C. Electrical limits across the full temperature range are guaranteed by design and correlation.
Note 3: Blanking time and retry time are generated by the same oscillator. Therefore, the ratio of is a constant value of 32.
See Figures 2 and 3.
t
t
RETRY
BLANK
Figure 1. Timing Diagram for Measuring Turn-On Time (tSS) and Turn-Off Time (t
OFF
)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
FLAG OUTPUT
FLAG Output Logic-Low Voltage I
FLAG Output Lea kage Current VIN = V
DYNAMIC
Turn-On Time t
Turn-Off Time t
Current-Limit Reaction Time t
Blanking Time t
Retry Time t
THERMAL PROTECTION
Thermal Shutdown Low-to-high +170 °C
Thermal Shutdown H ysteresis 15 °C
SS
OFF
LIM
BLANK
RETRY
= 1mA 0.4 V
SINK
= 5.5V, FLAG deas serted 1 μA
FLAG
Time from ENABLE signal to V
of V
= 3.3V, Figure 1
IN
Time from DISABLE signal to V
of V
= 3.3V, RL = 20, Figure 1
IN
V
= 3.3V, R
IN
output high and then short-circuit applied
= 91.78k to 563.12 k,
SETI
OUT
OUT
= 90%
= 10%
1 ms
250 μs
3 μs
(Note 3) 10 14.5 25 ms
MAX14523A/MAX14523AL (Note 3) 320 875 ms
ON(ON)*
t
SS
V
OUT
*( ) THE POLARITY OF THE SIGNAL IS REVERSED FOR THE MAX14523AL ONLY.
90% V
IN
10% V
t
OFF
IN
MAX14523A/MAX14523AL/MAX14523B/MAX14523C
250mA to 1.5A, Adjustable
Current-Limit Switches
4 _______________________________________________________________________________________
Figure 2. Autoretry Fault Diagram
Figure 3. Latchoff Fault Diagram
OUT
CURRENT LIMIT
LOAD CURRENT
FLAG
t
BLANK
t
RETRY
t
BLANK
t
BLANK
t
RETRY
t
BLANK
t
BLANK
t
BLANK
THE DEVICE GOES TO
THERMAL-SHUTDOWN MODE
OUT
CURRENT LIMIT
LOAD CURRENT
THE DEVICE GOES TO
THERMAL-SHUTDOWN MODE
FLAG
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