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MAX14562
36V-Capable Overvoltage Protector with
Regulated Output Voltage
19-5570; Rev 1; 8/11
General Description
The MAX14562 protects valuable consumer circuits
against voltage faults of up to +36V. This robust protec-
tion is implemented in a three-step scheme for a superior
result. If the input is below the preset regulated output-
voltage (VPROV) threshold, the output tracks the input
minus the voltage drop (RON x ILOAD) across the pass
FET. If the input exceeds VPROV, the output is regulated
to VPROV. If the input rises further and exceeds the over-
voltage lockout cutoff threshold (VOVLO), the output is
disconnected from the input.
A low resistance 160mI (typ) FET is integrated in the
MAX14562, effectively reducing the component count
and application footprint. The MAX14562 also features
thermal shutdown protection against a short-circuit
event.
The MAX14562 is specified over the extended -40NC to
+85NC temperature range and is available in 8-pin TDFN
(2mm x 2mm) package.
Applications
Features
S Input Voltage Protection Up to +36V
S Preset Regulated Output Voltage (+5.15V typ)
S Integrated 160mI (typ) N-Channel MOSFET
Switch
S Soft-Start to Minimize In-Rush Current
S Overvoltage Cutoff Protection +8V (typ)
S Thermal Shutdown Protection
S -40NC to +85NC Operating Temperature Range
Ordering Information
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
*EP = Exposed pad.
Mobile Phones
Smartphones
Portable Media Player
PDAs
Digital Cameras
Bluetooth Headset
E-Book
Mobile Internet Device
Typical Operating Circuit
PART TEMP
RANGE
PIN-
PACKAGE
TOP
MARK
MAX14562ETA+T -40NC to
+85NC8 TDFN-EP* ADI
MAX14562
IN
IN
* *
OUT
ACOK
EN
OUT
GND
10kΩ
1µF 1µF
TRAVEL
ADAPTER
INPUT
GND
VBUS
*ONLY TDFN.
VIO
CHARGER
INPUT SYSTEM LOAD
CHARGER
OUTPUT
PMIC
VBUS
APIC WITH
HS USB
MAX14562
36V-Capable Overvoltage Protector with
Regulated Output Voltage
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.
(Voltages referenced to GND.)
IN .......................................................................... -0.3V to +40V
OUT ........................................................................ -0.3V to +6V
EN, ACOK .............................................................. -0.3V to +6V
Continuous Current Through IN/OUT
8-Pin TDFN .................................................................... Q1.6A
10ms Current Through IN/OUT
8-Pin TDFN ....................................................................... Q2A
Continuous Power Dissipation (TA = +70oC):
8-Pin TDFN (derate 11.9mW/NC above +70NC) ..........953mW
Operating Temperature Range ......................... -40NC to +85NC
Storage Temperature Range .......................... -65NC to +150NC
Junction Temperature .....................................................+150NC
Lead Temperature (soldering, 10s) ...............................+300NC
Soldering Temperature (reflow) .....................................+260NC
ELECTRICAL CHARACTERISTICS
(VIN = +2.2V to +36V, TA = -40NC to +85NC, unless otherwise noted. Typical values are at VIN = +5.0V and TA = +25NC.) (Note 2)
ABSOLUTE MAXIMUM RATINGS
TDFN
Junction-to-Ambient Thermal Resistance (BJA) ...... 83.9NC/W
Junction-to-Case Thermal Resistance (BJC) .............. 37NC/W
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.
PACKAGE THERMAL CHARACTERISTICS (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Input Voltage VIN 2.2 36 V
Preset Regulated Output Voltage VPROV
IOUT = 0mA, VIN = 6.5V 4.85 5.15 5.45
VIOUT = 200mA, VIN = 6.5V 4.75 5.15 5.45
IOUT = 800mA, VIN = 6V (Note 3) 4.75 5.15 5.45
Output Voltage VOUT IOUT = 0mA VIN > VPROV VPROV V
VIN < VPROV (Note 4) VIN V
Overvoltage Lockout Cutoff
Threshold Rising VOVLO IN rising 7.44 8 8.56 V
Overvoltage Lockout Hysteresis % of typ VOVLO 1 %
Input Supply Current IIN
EN = low, VIN = 4.5V, IOUT = 0mA 120 260 FA
EN = low, VIN = 7V, IOUT = 0mA 300 550
Input Shutdown Current IIN_Q EN = high, VIN = 3V 2.5 5 FA
OUT Shutdown Current VIN = 5V, VOUT = 4V, EN = high -1 +1 FA
On-Resistance RON VIN = 4.75V, IOUT = 100mA 280 mI
LDO Load Capacitance IOUT up to 0.8A 10 FF
DIGITAL SIGNALS (EN, ACOK)
EN Input High Voltage VIH 1.4 V
EN Input Low Voltage VIL 0.4 V
EN Input Leakage Current ILEAK VEN = 0V or 5.5V -150 +150 nA
ACOK Output Low Voltage VOL VIO = 3.3V, ISINK = 1mA (see Typical
Operating Circuit)0.4 V
ACOK Leakage Current VIO = 3.3V, ACOK deasserted (see Typical
Operating Circuit)-200 +200 nA
MAX14562
36V-Capable Overvoltage Protector with
Regulated Output Voltage
3
ELECTRICAL CHARACTERISTICS (continued)
(VIN = +2.2V to +36V, TA = -40NC to +85NC, unless otherwise noted. Typical values are at VIN = +5.0V and TA = +25NC.) (Note 2)
Note 2: All devices are 100% production tested at TA = +25NC. Limits over the operating temperature range are guaranteed by
design and not production tested.
Note 3: Thermally limited, guaranteed by design, and not production tested.
Note 4: In linear mode, as IOUT increases, the OUT voltage drops due to a voltage across Q1 (see Functional Diagram).
Note 5: All timing characteristics are measured using 20% and 80% levels unless otherwise specified.
Figure 1. Enable/Select Time
VOVLO
VPROV
VPROV
MIN
tDEB
tACOK tACOK tDEB
tON tON
tOFF tDEB
tDEB
IN
OUT
IOUT
EN
ACOK
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
TIMING CHARACTERISTICS (Note 4)
Input Debounce Time tDEB VIN_MIN < VIN < VOVLO until charge pump
turns on, see Figure 1 10 20 35 ms
ACOK Time tACOK VIN_MIN < VIN < VOVLO to ACOK low until
charge pump turns on, see Figure 1 20 40 70 ms
Turn-on Time During Soft-Start tON RLOAD = 100I, CLOAD = 1FF, VOUT =
20% of VIN to 80% of VIN, see Figure 1 48 Fs
Overvoltage Turn-Off Time tOFF VIN > VOVLO to VOUT = 80% of VPROV,
RLOAD = 100I, see Figure 1 1Fs
THERMAL PROTECTION
Thermal Shutdown TSHDN 150 NC
Thermal Hysteresis THYST 20 NC
MAX14562
36V-Capable Overvoltage Protector with
Regulated Output Voltage
4
Typical Operating Characteristics
(CIN = 1µF, COUT = 4.7µF, TA = +25°C, unless otherwise noted.)
VOVLO vs. TEMPERATURE
MAX14562 toc08
TEMPERATURE (°C)
VOVLO (V)
603510-15
7.85
7.90
7.95
8.00
7.80
-40 85
NORMALIZED DEBOUNCE TIME
vs. TEMPERATURE
MAX14562 toc07
TEMPERATURE (°C)
NORMALIZED DEBOUNCE TIME
6035-15 10
0.85
0.90
0.95
1.00
1.10
1.05
1.15
1.20
0.80
-40 85
VIN = 5V
IOUT = 100mA
OUT VOLTAGE vs. IN VOLTAGE
MAX14562 toc06
IN VOLTAGE (V)
OUT VOLTAGE (V)
302010
1
2
3
4
5
6
0
0 40
IOUT = 100mA
VPROV vs. TEMPERATURE
MAX14562 toc05
TEMPERATURE (°C)
VPROV (V)
603510-15
5.12
5.14
5.16
5.18
5.20
5.10
-40 85
VIN = 6V
IOUT = 100mA
NORMALIZED ON-RESISTANCE
vs. TEMPERATURE
MAX14562 toc04
TEMPERATURE (°C)
NORMALIZED ON-RESISTANCE
6035-15 10
0.7
0.8
0.9
1.0
1.2
1.1
1.3
1.4
0.6
-40 85
IOUT = 100mA
EACH VIN CURVE IS NORMALIZED
INDEPENDENTLY AT 25°C
VIN = 3V
VIN = 4.2V
NORMALIZED ON-RESISTANCE
vs. SUPPLY VOLTAGE
MAX14562 toc03
SUPPLY VOLTAGE (V)
NORMALIZED ON-RESISTANCE
5.04.53.5 4.03.02.5
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.6
0.6
2.0 5.5
IOUT = 100mA
LDO ABOVE 5.15V
IN SUPPLY CURRENT vs. TEMPERATURE
MAX14562 toc02
TEMPERATURE (°C)
IN SUPPLY CURRENT (µA)
603510-15
20
40
60
80
100
120
140
160
180
200
0
-40 85
VEN = 0V
VIN = 5V
VIN = 2.2V
IN SUPPLY CURRENT vs. IN VOLTAGE
MAX14562 toc01
IN VOLTAGE (V)
IN SUPPLY CURRENT (µA)
302010
50
100
150
200
250
300
0
0 40
VEN = 0V
MAX14562
36V-Capable Overvoltage Protector with
Regulated Output Voltage
5
Typical Operating Characteristics (continued)
(CIN = 1µF, COUT = 4.7µF, TA = +25°C, unless otherwise noted.)
SWITCH TURN-OFF TIME RESPONSE
(RLOAD = 100Ω)
MAX14562 toc14
2ms/div
5V
0V
0V
5V
0V
3.3V
IN
5V/div
OUT
5V/div
ACOK
5V/div
SWITCH TURN-ON TIME RESPONSE
(RLOAD = 100Ω)
MAX14562 toc13
10ms/div
5V
0V
0V
5V
0V
3.3V
IN
5V/div
OUT
5V/div
ACOK
5V/div
LOAD TRANSIENT
(VEN = 0V)
MAX14562 toc12
200ns/div
5V
5V
IN
5V/div
OUT
5V/div
IOUT
500mA/div
ACOK
5V/div
0V
800mA
10mA
LOAD TRANSIENT
(VEN = 0V)
MAX14562 toc11
200ns/div
5V
5V
IN
5V/div
OUT
5V/div
IOUT
500mA/div
ACOK
5V/div
0V
800mA
10mA
IN FALL TRANSIENT RESPONSE
(IOUT = 10mA)
MAX14562 toc10
250µs/div
6V IN
5V/div
OUT
5V/div
EN
5V/div
ACOK
5V/div
4V
VPROV
4V
0V
0V
IN RISE TRANSIENT RESPONSE
(IOUT = 10mA)
MAX14562 toc09
250µs/div
6V IN
5V/div
OUT
5V/div
EN
5V/div
ACOK
5V/div
4V
VPROV
4V
0V
0V
MAX14562
36V-Capable Overvoltage Protector with
Regulated Output Voltage
6
Typical Operating Characteristics (continued)
(CIN = 1µF, COUT = 4.7µF, TA = +25°C, unless otherwise noted.)
OUT SHORT SHUTDOWN
(THERMAL)
MAX14562 toc18
20ms/div
6V
2.5A
0A
0V
0V
3V
5V
IN
5V/div
OUT
2V/div
ACOK
5V/div
IOUT
1A/div
ACOK RESPONSE (OVERVOLTAGE CONDITION)
(RLOAD = 50Ω)
MAX14562 toc17
10ms/div
12V
3V
0V
0V
6V
100mA
0A
5V
IN
5V/div
OUT
5V/div
ACOK
5V/div
IOUT
100mA/div
POWER-UP RESPONSE
(CLOAD = 470µF)
MAX14562 toc16
10ms/div
5V
0V
5V
0V
3V
0V
3.3V
IN
5V/div
OUT
5V/div
ACOK
5V/div
EN
5V/div
POWER-UP RESPONSE
(CLOAD = 470µF)
MAX14562 toc15
10ms/div
5V
0V
0V
5V
0V
3.3V
IN
5V/div
OUT
5V/div
ACOK
5V/div
MAX14562
36V-Capable Overvoltage Protector with
Regulated Output Voltage
7
Pin Configuration
Pin Description
1
+
3 4
8 6 5
OUT ACOK GND
2
7
OUT
IN
*CONNECT EXPOSED PAD TO GND.
*EP
EN N.C.IN
TDFN
(2mm × 2mm)
TOP VIEW
MAX14562
PIN NAME FUNCTION
1,2 IN
Overvoltage Protection Input. Bypass IN with a 1FF ceramic capacitor to get Q15kV HBM ESD
protection. No capacitor is required for ±2kV HBM ESD protection. Externally connect both IN
pins together.
3EN Active-Low Enable Input. Drive EN low to turn on the device. Drive EN high to turn off the device.
4 N.C. No Connection. Not internally connected.
5 GND Ground
6ACOK
Open-Drain Flag Output. ACOK is driven low after input voltage is stable between minimum VIN
and VOVLO after soft-start time (double of debounce time). Connect a pullup resistor from ACOK
to the logic I/O voltage of the host system.
7,8 OUT Overvoltage Protection Output. Bypass OUT with a 1FF or larger ceramic capacitor (see Table 1).
Externally connect both OUT pins together.
— EP Exposed Pad. Connect EP to GND.
MAX14562
36V-Capable Overvoltage Protector with
Regulated Output Voltage
8
Detailed Description
The MAX14562 features the overvoltage protection to
the charger input VBUS line when a travel adapter (TA) is
used. In addition, the MAX14562 features a low 160mI
(typ) on-resistance internal FET (Q1) and protects the
low-voltage system against voltage faults up to +36V.
The MAX14562 features three-step overvoltage pro-
tection. When the input is below the preset regulated
output-voltage (VPROV) threshold, the output follows
the input minus the voltage drop across the pass FET
(RON x ILOAD). When the input exceeds VPROV, the
output is regulated to VPROV. If the input rises further
and exceeds the overvoltage lockout cutoff (VOVLO)
threshold, the output is disconnected from the input. The
MAX14562 also features thermal shutdown protection
against short-circuit events.
Soft-Start
To minimize inrush current, the MAX14562 features a
soft-start capability to slowly turn on Q1.
Soft-start function permits the device to charge the load
capacitor up to 1000FF by controlled current. The soft-
start is initiated when the debounce time ends (OUT
starts charging) and ends when ACOK is asserted low,
15ms (typ).
Linear Mode
When the input voltage exceeds the minimum IN volt-
age but is below VPROV, OUT follows IN with a minimum
voltage drop (RON x ILOAD) across pass FET after the
debounce time, tDEB, and ACOK is asserted.
The LDO mode needs a capacitor on OUT. The recom-
mended value is 10FF for load currents up to 800mA
(Table 1).
Preset Regulated Output-Voltage Mode
(PROV)
When IN goes above the preset regulated output voltage
(VPROV), Q1 provides a constant voltage of VPROV at
OUT, and ACOK is asserted.
Functional Diagram
Table 1. Recommended Load Capacitance
MAX14562
TIMING
AND
CONTROL LOGIC
VBG
INOVLO
EN
OK EN
ACOK
OUTIN
BG
POK
Q1
PROTECTIONHV CP
PROV CONTROL
OVLO CONTROL
LOAD CURRENT (mA) LOAD CAP (µF)
10 1
50 2.2
100 4.7
800 10
MAX14562
36V-Capable Overvoltage Protector with
Regulated Output Voltage
9
Overvoltage Lockout Mode (OVLO)
When IN goes above the overvoltage lockout threshold
(VOVLO), OUT is disconnected from IN and ACOK is
deasserted. Power dissipation increases when the input
goes higher than VPROV. The overvoltage lockout thresh-
old is set to further the power dissipation. When IN drops
below VOVLO, the debounce time starts counting. After
the debounce time (2 x tDEB), OUT follows IN again and
ACOK is asserted.
Thermal Shutdown
The MAX14562 features a thermal shutdown function
necessary to protect the device. The device turns off
and ACOK is deasserted when the junction temperature
exceeds +150NC (typ). When the temperature drops
20NC (typ) below 150NC (typ), the device turns back on
and Q1 is turned on after the debounce time.
Applications Information
Power-Supply Decoupling
Bypass IN pin(s) to ground with a 1FF or larger ceramic
capacitor placed as close as possible to the device.
Chip Information
PROCESS: BiCMOS
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
PACKAGE
CODE
OUTPUT
NO.
LAND
PATTERN NO.
8 TDFN-EP T822+1 21-0168 90-0064
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. The parametric values (min and max limits) shown in the Electrical
Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
10 Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2011 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.
MAX14562
36V-Capable Overvoltage Protector with
Regulated Output Voltage
Revision History
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 9/10 Initial release —
1 8/11 Removed SC70 pin information from data sheet. Added additional conditions to
Preset Regulated Output Voltage parameter in the Electrical Characteristics table 1, 2, 3, 7, 9
