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19-4814; Rev 1; 1/11
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 70m 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 -40C to +125C automotive temperature range. Adjustable Current-Limit Threshold Low-Dropout Voltage (70mV at 1A Load Current) Short-Circuit Protection Thermal-Shutdown Protection Reverse-Current Protection 170A (typ) Supply Current Shutdown Reverse Current, 0.6A (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 1F CHARGE PUMP OUT 1F LOAD
Applications
SDIO Ports USB Ports
P VPULLUP RSETI CURRENT REFERENCE
CONTROL LOGIC
Notebook VGA Ports GPS Cell Phones MP3 Players UTCA/ATCA Platforms
*ON FOR THE MAX14523AL ONLY. GND 10k FLAG ON(ON)* N.C.
MAX14523A MAX14523AL MAX14523B MAX14523C
Pin Configuration appears at end of data sheet.
Ordering Information/Selector Guide
PART MAX14523AATA+ MAX14523ALATA+** MAX14523BATA+ MAX14523BATA/V+T MAX14523CATA+ PIN-PACKAGE 8 TDFN-EP* 8 TDFN-EP* 8 TDFN-EP* 8 TDFN-EP* 8 TDFN-EP* TOP MARK BLO BLP BLQ BLQ BLS ON POLARTIY Active-High Active-Low Active-High Active-High Active-High OVERCURRENT RESPONSE Autoretry Autoretry Latch-Off Latch-Off Continuous
Note: All devices are specified over the -40C to +125C 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
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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.
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)................................20mA Out Short Circuit to GND...................................Internally Limited Continuous Power Dissipation (TA = +70C) for multilayer board: TDFN (derate 24.4mW/C above +70C)...................1952mW Operating Temperature Range .........................-40C to +125C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C Soldering Temperature (reflow) .......................................+260C
PACKAGE THERMAL CHARACTERISTICS (Note 1)
TDFN Junction-to-Ambient Thermal Resistance (JA) ...........41C/W Junction-to-Case Thermal Resistance (JC) ..................8C/W Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a fourlayer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial.
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.
ELECTRICAL CHARACTERISTICS
(VIN = +1.7V to +5.5V, RSETI = 94.2k, CIN = COUT = 1F, and TA = TJ = -40C to +125C, unless otherwise noted. Typical values are at VIN = +3.3V, TA = +25C.) (Note 2)
PARAMETER SUPPLY OPERATION Operating Voltage Quiescent Current Latchoff Current Shutdown Forward Current Shutdown Reverse Current INTERNAL FET Switch-On Resistance Forward-Current Limit (RSETI +2.48k ) x ILIM Product Reverse Blocking Current Reverse Blocking Threshold FLAG Assertion Drop Voltage Threshold ON, ON INPUT ON, ON Input Leakage ON, ON Input Logic-High Voltage ON, ON Input Logic-Low Voltage ILEAK VIH VIL VON, VON = VIN or VGND -1 1.6 0.4 +1 A V V VOUT - VIN VFA R ON ILIM VIN = 3.3V, I OUT lower than ILIM RSETI = 91.78k , VIN - VOUT = 1V RSETI = 563.12k , VIN - VOUT = 1V ILIM = 250mA to 1500mA, VIN - VOUT = 1V VOUT > VIN + 140mV, after reverse-currentlimit shutdown VOUT - VIN = 300mV, OUT falling until switch turns on Increase (VIN - VOUT) drop until FLAG asserts, I OUT limiting, VIN = 3.3V 40 95 350 1350 225 127.2 70 1500 250 141.4 130 1650 275 155.5 2 140 m mA kV A mV mV VIN IQ ILATCH I SHDN IRSHDN I OUT = 0A, switch on, VIN = 3.3V VIN = 3.3V, I OUT = 0A , after an overcurrent fault (MAX14523B) VON = 0V, VON = VIN, VIN = 5.5V, VOUT = 0V VON = 0V, VON = VIN, VIN = 1.7V, VOUT = 5.5V (current into OUT) 1.7 170 10 0.5 0.01 5.5 300 20 7 0.6 V A A A A SYMBOL CONDITIONS MIN TYP MAX UNITS
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250mA to 1.5A, Adjustable Current-Limit Switches
ELECTRICAL CHARACTERISTICS (continued)
(VIN = +1.7V to +5.5V, RSETI = 94.2k, CIN = COUT = 1F, and TA = TJ = -40C to +125C, unless otherwise noted. Typical values are at VIN = +3.3V, TA = +25C.) (Note 2)
PARAMETER FLAG OUTPUT FLAG Output Logic-Low Voltage FLAG Output Leakage Current DYNAMIC Turn-On Time Turn-Off Time Current-Limit Reaction Time Blanking Time Retry Time THERMAL PROTECTION Thermal Shutdown Thermal Shutdown Hysteresis Low-to-high +170 15 C C t SS t OFF tLIM tBLANK tRETRY Time from ENABLE signal to V OUT = 90% of VIN = 3.3V, Figure 1 Time from DISABLE signal to VOUT = 10% of VIN = 3.3V, RL = 20 , Figure 1 VIN = 3.3V, RSETI = 91.78k to 563.12k , output high and then short-circuit applied (Note 3) MAX14523A/MAX14523AL (Note 3) 10 320 1 250 3 14.5 25 875 ms s s ms ms ISINK = 1mA VIN = VFLAG = 5.5V, FLAG deasserted 0.4 1 V A SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX14523A/MAX14523AL/MAX14523B/MAX14523C
Note 2: All devices are 100% tested at 125C. Electrical limits across the full temperature range are guaranteed by design and correlation. t Note 3: Blanking time and retry time are generated by the same oscillator. Therefore, the ratio of RETRY is a constant value of 32. tBLANK See Figures 2 and 3.
ON(ON)*
tSS 90% VIN VOUT
tOFF
10% VIN
*( ) THE POLARITY OF THE SIGNAL IS REVERSED FOR THE MAX14523AL ONLY.
Figure 1. Timing Diagram for Measuring Turn-On Time (tSS) and Turn-Off Time (tOFF)
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250mA to 1.5A, Adjustable Current-Limit Switches MAX14523A/MAX14523AL/MAX14523B/MAX14523C
tBLANK tRETRY tBLANK tRETRY tBLANK tBLANK
OUT
CURRENT LIMIT LOAD CURRENT THE DEVICE GOES TO THERMAL-SHUTDOWN MODE
FLAG
Figure 2. Autoretry Fault Diagram
tBLANK
tBLANK
OUT
CURRENT LIMIT LOAD CURRENT THE DEVICE GOES TO THERMAL-SHUTDOWN MODE
FLAG
Figure 3. Latchoff Fault Diagram
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250mA to 1.5A, Adjustable Current-Limit Switches
Typical Operating Characteristics
(VIN = +3.3V, CIN = 1F, COUT = 1F, RSETI = 94.2k, TA = +25C, unless otherwise noted.)
MAX14523A/MAX14523AL/MAX14523B/MAX14523C
CURRENT LIMIT vs. SUPPLY VOLTAGE
MAX14523A toc01
NORMALIZED CURRENT LIMIT vs. TEMPERATURE
MAX14523A toc02
QUIESCENT SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX14523A toc03
1.60
1.10
300 QUIESCENT SUPPLY CURRENT (A)
1.55 CURRENT LIMIT (A)
NORMALIZED CURRENT LIMIT
1.05
250
1.50
1.00
200
1.45
0.95
150
1.40 1.70 2.65 3.60 4.55 5.50 SUPPLY VOLTAGE (V)
0.90 -40 -7 26 59 92 125 TEMPERATURE (C)
100 1.70 2.65 3.60 4.55 5.50 SUPPLY VOLTAGE (V)
QUIESCENT SUPPLY CURRENT vs. TEMPERATURE
MAX14523A toc04
SHUTDOWN SUPPLY CURRENT vs. TEMPERATURE
MAX14523A toc05
SHUTDOWN FORWARD CURRENT vs. TEMPERATURE
SHUTDOWN FORWARD CURRENT (A) 9 8 7 6 5 4 3 2 1 0 VIN = +1.7V VIN = +5.5V VON = 0V, VOUT = 0V
MAX14523A toc06
300 QUIESCENT SUPPLY CURRENT (A)
10 QUIESCENT SUPPLY CURRENT (A) 9 8 7 6 5 4 3 2 1
VON = 0V
10
250 VIN = +5V 200
VIN = +5V
150 VIN = +3.3V 100 -40 -7 26 59 92 125 TEMPERATURE (C)
VIN = +3.3V
0 -40 -7 26 59 92 125 TEMPERATURE (C)
-40
-7
26
59
92
125
TEMPERATURE (C)
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250mA to 1.5A, Adjustable Current-Limit Switches MAX14523A/MAX14523AL/MAX14523B/MAX14523C
Typical Operating Characteristics (continued)
(VIN = +3.3V, CIN = 1F, COUT = 1F, RSETI = 94.2k, TA = +25C, unless otherwise noted.)
SHUTDOWN REVERSE CURRENT vs. TEMPERATURE
SHUTDOWN REVERSE CURRENT (A) 9 8 7 6 5 4 3 2 1 0 -40 -7 26 59 92 125 TEMPERATURE (C) 0 -40 -7 VON = 0V, VIN = +1.7V, VOUT = +5.5V
MAX14523A toc07
LATCHOFF CURRENT vs. TEMPERATURE
MAX14523B 25 LATCHOFF CURRENT (A) VIN = +5.5V 20 15 10 5 VIN = +3.3V 26 59 92 125
MAX14523A toc08
NORMALIZED ON-RESISTANCE vs. SUPPLY VOLTAGE
1.15 NORMALIZED ON-RESISTANCE 1.10 1.05 1.00 0.95 0.90 0.85 0.80 1.70 2.65 3.60 VOLTAGE (V) 4.55 5.50
MAX14523A toc09
10
30
1.20
TEMPERATURE (C)
NORMALIZED ON-RESISTANCE vs. SUPPLY TEMPERATURE
MAX14523A toc10
SWITCH TURN-ON TIME vs. SUPPLY TEMPERATURE
MAX14523A toc11
SWITCH TURN-OFF TIME vs. SUPPLY TEMPERATURE
900 SWITCH TURN-OFF TIME (s) 800 700 600 500 400 300 200 100 0 VIN = +3.3V -40 -7 26 59 92 125 VIN = +5.0V RLOAD = 20
MAX14523A toc12
1.5 1.4 NORMALIZED ON-RESISTANCE 1.3 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 -40 -7 26 59 92
1.5 1.4 SWITCH TURN-ON TIME (ms) 1.3 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5
RLOAD = 20 VIN = +5.0V
1000
VIN = +3.3V
125
-40
-7
26
59
92
125
TEMPERATURE (C)
TEMPERATURE (C)
TEMPERATURE (C)
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250mA to 1.5A, Adjustable Current-Limit Switches
Typical Operating Characteristics (continued)
(VIN = +3.3V, CIN = 1F, COUT = 1F, RSETI = 94.2k, TA = +25C, unless otherwise noted.)
MAX14523A/MAX14523AL/MAX14523B/MAX14523C
CURRENT LIMIT RESPONSE
MAX14523A toc13
CURRENT LIMIT RESPONSE
MAX14523A toc14
FLAG RESPONSE (OVERLOAD CONDITION)
MAX14523A toc15
SUDDEN SHORT APPLIED AT OUTPUT VOUT 2V/div
RLOAD = 16.5 TO SUDDEN SHORT APPLIED AT OUTPUT VOUT 2V/div
RLOAD = 16.5 TO SUDDEN SHORT APPLIED AT OUTPUT VFLAG 2V/div
IOUT 10A/div
IOUT 1A/div
IOUT 1A/div
2s/div
20ms/div
20ms/div
Pin Description
PIN MAX14523AL 1, 6 2 MAX14523A MAX14523B MAX14523C 1, 6 2 NAME FUNCTION
N.C. FLAG
No Connection. Not internally connected. Connect N.C. to GND or leave unconnected. Open-Drain, Overload Indicator Output. FLAG goes low when the overload fault duration exceeds the blanking time, reverse current is detected, thermal shutdown mode is active, or SETI is connected to ground. Overload-Current Limit Adjust. Connect a resistor from SETI to GND to program the overcurrent limit. If SETI is connected to GND the switch turns off and FLAG is asserted. If SETI is unconnected the current limit is at 0mA. Do not connect any capacitance larger than 20pF to SETI. Switch Output. Bypass OUT with a 1F capacitor to GND. Power Input. Bypass IN with a 1F ceramic capacitor to GND. Use higher capacitance if necessary to prevent large load transients from pulling down the supply voltage. Active-Low, Switch-ON Input. Drive ON low to turn on the switch. Active-High, Switch-ON Input. Drive ON high to turn on the switch. Ground Exposed Pad. Internally connected to GND. For enhanced thermal dissipation, connect EP to a large copper ground plane. Do not use EP as the sole ground connection.
3
3
SETI
4 5 7
4 5
OUT IN ON
7 8 -- 8 --
ON GND EP
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250mA to 1.5A, Adjustable Current-Limit Switches MAX14523A/MAX14523AL/MAX14523B/MAX14523C
Functional Diagram
REVERSECURRENT PROTECTION IN THERMAL SHUTDOWN BUFFER OUT
CONTROL LOGIC
FLAG
N.C.
TIMING CIRCUITRY
MAX14523A MAX14523AL MAX14523B MAX14523C
ON/(ON)*
BANDGAP REFERENCE
CURRENT LIMIT BUFFER SETI
GND
*( ) FOR THE MAX14523AL ONLY
Detailed Description
The MAX14523A/MAX14523AL/MAX14523B/MAX14523C programmable current-limit switches operate from +1.7V to +5.5V and provide internal current limiting adjustable from 250mA to 1.5A. These devices feature a fixed blanking time, and a FLAG output that notifies the processor when a fault condition is present.
Autoretry (MAX14523A/MAX14523AL)
When the forward current reaches the current threshold, the tBLANK timer begins counting (Figure 2). FLAG asserts if the overcurrent condition is present for tBLANK or longer. The timer resets if the overcurrent condition disappears before the blanking time (tBLANK) has elapsed. A retry time delay (tRETRY) starts immediately after the blanking time has elapsed. During that time, the switch latches off. At the end of tRETRY, the switch turns on again. If the fault still exists, the cycle repeats. If the fault has been removed, the switch stays on. During this cycle, FLAG stays low. In autoretry, if the die temperature exceeds +170C (typ) due to self heating, the MAX14523A/MAX14523AL go into thermal shutdown until the die temperature drops by approximately 15C (see the Thermal Shutdown section.)
Programmable Current Limit/Threshold
A resistor from SETI to GND sets the current limit/threshold for the switch (see the Setting the Current Limit/Threshold section). If the output current is limited at the current threshold value for a time equal to or longer than tBLANK, the output flag asserts and the MAX14523A/MAX14523AL enter the autoretry mode, the MAX14523B latches off the switch, and the MAX14523C enters the continuous current-limit mode.
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250mA to 1.5A, Adjustable Current-Limit Switches
The autoretry feature saves system power in case of an overcurrent or short-circuit condition. During tBLANK time, when the switch is on, the supply current is held at the current limit. During time tRETRY, when the switch is off, the current through the switch is zero. Thus, the average output current is much less than the programmed current limit. Calculate the average output current using the following equation: ILOAD = ILIM [(tBLANK )/(tBLANK + tRETRY)] With a typical tBLANK = 17.5ms and typical tRETRY = 560ms, the duty cycle is 3%, resulting in a 97% power savings over the switch being on the entire time.
Switch-On/Off Control
The ON input for the MAX14523A/MAX14523B/ MAX14523C and ON input for the MAX14523AL control the switch, see Table 1. Toggle ON for the MAX14523B to reset the fault condition once the short-circuit current is detected and the device shuts down.
MAX14523A/MAX14523AL/MAX14523B/MAX14523C
Reverse-Current Protection
The MAX14523A/MAX14523AL/MAX14523B/MAX14523C feature a reverse-current protection circuit that limits the backflow current to 2A when the reverse-current protection circuitry has tripped. The switch turns off and FLAG asserts without waiting for tBLANK to elapse. The switch turns back on and FLAG deasserts when VIN V OUT drops below the reverse-current threshold by 95mV (typ).
Latchoff (MAX14523B)
When the forward current reaches the current threshold, the tBLANK timer begins counting (Figure 3). FLAG asserts if an overcurrent condition is present for greater than tBLANK time. The timer resets if the overcurrent condition disappears before t BLANK has elapsed. The switch turns off if the overcurrent condition continues beyond the blanking time. Reset the switch by either toggling the control logic (ON or ON) or cycling the input voltage. If the die temperature exceeds +170C (typ) due to self heating, the MAX14523B goes into thermal shutdown until the die temperature drops by approximately 15C (see the Thermal Shutdown section).
FLAG Indicator
FLAG is an open-drain fault indicator output and requires an external pullup resistor to a DC supply. FLAG goes low when any of the following conditions occur: * * * * The blanking time has elapsed The reverse-current protection has tripped The die temperature exceeds +170C SETI is connected to ground.
Thermal Shutdown
Thermal-shutdown circuitry protects the devices from overheating. The switch turns off and FLAG goes low immediately when the junction temperature exceeds +170C (typ). The switch turns on again after the device temperature drops by approximately 15C (typ).
Continuous Current Limit (MAX14523C)
When the forward current reaches the forward-current threshold, the MAX14523C limits the output current to the programmed current limit. FLAG asserts if the current limit is present for tBLANK and deasserts when the overload condition is removed. In this mode, if die temperature exceeds +170C (typ) due to self heating, the MAX14523C goes into thermal shutdown until the die temperature drops by approximately 15C (see the Thermal Shutdown section).
Applications Information
Setting the Current Limit/Threshold
A resistor from SETI to ground programs the current limit/threshold value for the MAX14523A/MAX14523AL/ MAX14523B/MAX14523C. Table 2 lists various current limit/thresholds set by different resistor values at SETI. Leaving SETI unconnected selects a 0 current limit/threshold. Connecting SETI to ground asserts FLAG. Use the following formula to calculate the current limit: RSETI(k) = 141400(V) - 2.48(k) ILIM (mA)
Table 1. Switch Truth Table
MAX14523A MAX14523B MAX14523C ON 0 1 MAX14523AL ON 1 0 Off On SWITCH STATUS
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250mA to 1.5A, Adjustable Current-Limit Switches MAX14523A/MAX14523AL/MAX14523B/MAX14523C
Table 2. Current Limit/Threshold vs. Resistor Values
RSETI (k ) 91.78 121 221 301 422 563.12 (Open) TYPICAL CURRENT LIMIT/THRESHOLD (mA) 1500 1145 632 466 333 250 0
change is minimal. If the output is continuously shorted to ground at the maximum supply voltage, the operation of the switches with the autoretry option does not cause problems because the total power dissipated during the short is scaled by the duty cycle: P(MAX) = VIN(MAX) x IOUT(MAX) x tBLANK tRETRY + tBLANK
Attention must be given to the MAX14523C continuous current-limit version when the power dissipation during a fault condition can cause the device to reach the thermal shutdown threshold.
Do not use an RSETI value smaller than 91.78k. Note: Connecting any capacitance larger than 20pF to SETI can cause instability.
Chip Information
PROCESS: BiCMOS
IN Bypass Capacitor
Connect a minimum of 1F capacitor from IN to GND to limit the input voltage drop during momentary output short-circuit conditions. Larger capacitor values further reduce the voltage undershoot at the input.
N.C. 1 2 3 4
Pin Configuration
OUT Bypass Capacitor
For stable operation over the full temperature range and over the full-programmable current-limit range, use a 1F ceramic capacitor from OUT to ground. Excessive output capacitance can cause a false overcurrent condition due to decreased dv/dt across the capacitor. Calculate the maximum capacitive load (CMAX) value that can be connected to OUT using the following formula: CMAX (F) = ILIM (mA) x tBLANK(MIN) (ms) VIN (V)
FLAG SETI OUT
+ MAX14523A MAX14523AL MAX14523B MAX14523C
*EP
8 7 6 5
GND ON(ON)** N.C. IN
TDFN 3mm x 3mm
*CONNECT EXPOSED PAD TO GND. **( ) FOR THE MAX14523AL ONLY.
For example, for VIN = 3.3V, tBLANK = 10ms, and ILIM = 300mA, CMAX equals 909F.
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a "+", "#", or "-" in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE 8 TDFN-EP PACKAGE CODE T833+2 OUTLINE NO. 21-0137 LAND PATTERN NO. 90-0059
Layout and Thermal Dissipation
To optimize the switch response time to output shortcircuit conditions, it is very important to keep all traces as short as possible to reduce the effect of undesirable parasitic inductance. Place input and output capacitors as close as possible to the device (no more than 5mm). IN and OUT must be connected with wide short traces to the power bus. During normal operation, the power dissipation is small and the package temperature
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250mA to 1.5A, Adjustable Current-Limit Switches
Revision History
REVISION NUMBER 0 1 REVISION DATE 7/09 1/11 Initial release Added the MAX14523BATA automotive-grade part to the Ordering Information DESCRIPTION PAGES CHANGED -- 1
MAX14523A/MAX14523AL/MAX14523B/MAX14523C
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11
(c) 2011 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.

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