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MAX6397VATA+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18
General Description
The MAX6397/MAX6398 are small, high-voltage overvolt-
age protection circuits. These devices disconnect the
output load or limit the output voltage during an input
overvoltage condition. These devices are ideal for appli-
cations that must survive high-voltage transients such as
those found in automotive and industrial applications.
The MAX6397/MAX6398 monitor the input or output
voltages and control an external n-channel MOSFET to
isolate or limit the load from overvoltage transient energy.
When the monitored input voltage is below the user-
adjustable overvoltage threshold, the external n-channel
MOSFET is turned on by the GATE output. In this mode,
the internal charge pump fully enhances the n-channel
MOSFET with a 10V gate-to-source voltage.
When the input voltage exceeds the overvoltage thresh-
old, the protection can disconnect the load from the
input by quickly forcing the GATE output low. In some
applications, disconnecting the output from the load is
not desirable. In these cases, the protection circuit can
be configured to act as a voltage limiter where the
GATE output sawtooths to limit the voltage to the load.
The MAX6397 also offers an always-on linear regulator
that is capable of delivering up to 100mA of output
current. This high-voltage linear regulator consumes
only 37µA of quiescent current.
The regulator is offered with output options of 5V, 3.3V,
2.5V, or 1.8V. An open-drain, power-good output (POK)
asserts when the regulator output falls below 92.5% or
87.5% of its nominal voltage.
The MAX6397/MAX6398 include internal thermal-shut-
down protection, disabling the external MOSFET and
linear regulator if the chip reaches overtemperature
conditions. The devices operate over a wide 5.5V to
72V supply voltage range, are available in small TDFN
packages, and are fully specified from -40°C to
+125°C.
Applications
Automotive
Industrial
FireWire
®
Notebook Computers
Wall Cube Power Devices
Features
o 5.5V to 72V Wide Supply Voltage Range
o Overvoltage Protection Controllers Allow User to
Size External n-Channel MOSFETs
o Internal Charge-Pump Circuit Ensures MOSFET
Gate-to-Source Enhancement for Low R
DS(ON)
Performance
o Disconnect or Limit Output from Input During
Overvoltage Conditions
o Adjustable Overvoltage Threshold
o Thermal-Shutdown Protection
o Always-On, Low-Current (37µA) Linear Regulator
Sources Up to 100mA (MAX6397)
o Fully Specified from -40°C to +125°C (T
J
)
o Small, Thermally Enhanced 3mm x 3mm TDFN
Package
MAX6397/MAX6398
Overvoltage Protection Switch/Limiter
Controllers Operate Up to 72V
________________________________________________________________
Maxim Integrated Products
1
MAX6397
8
REG
6
GATE
7
OUT
5
GND
3
SHDN
21
IN
TDFN
TOP VIEW
*EP
4
POKSET
*EXPOSED PAD. CONNECT TO GND.
Pin Configurations
Ordering Information
19-3668; Rev 5; 1/09
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.
*
Replace “-T” with “+T” for lead(Pb)-free/RoHS-compliant packages.
**
EP = Exposed pad.
The MAX6397 linear regulator is offered in four output voltage
options and a choice of a 92.5% or 87.5% POK threshold
assertions. See the Selector Guide.
PART TEMP RANGE PIN-PACKAGE
MAX6397_ATA-T* -40°C to +125°C 8 TDFN-EP**
MAX6398ATT-T* -40°C to +125°C 6 TDFN-EP**
Selector Guide and Typical Operating Circuit appear at end
of data sheet.
Pin Configurations continued at end of data sheet.
FireWire is a registered trademark of Apple Computer, Inc.
EVALUATION KIT
AVAILABLE
MAX6397/MAX6398
Overvoltage Protection Switch/Limiter
Controllers Operate Up to 72V
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
IN
= 14V; C
GATE
= 6000pF, C
REG
= 4.7µF, T
A
= T
J
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
= T
J
= +25°C.) (Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional oper-
ation 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.
(All pins referenced to GND, unless otherwise noted.)
IN, GATE, OUT ............................................................-0.3V to +80V
SHDN ..................................................................-0.3V to (IN + 0.3V)
GATE to OUT .................................................................-0.3 to +20V
SET, REG, POK ...........................................................-0.3V to +12V
Maximum Current:
IN, REG...............................................................................350mA
All Remaining Pins ...................................................................50mA
Continuous Power Dissipation (T
A
= +70°C)
6-Pin TDFN (derate 18.2mW/°C above +70°C) .............1455mW
8-Pin TDFN (derate 18.2mW/°C above +70°C) .............1455mW
Operating Temperature Range (T
A
) ......................-40°C to +125°C
Junction Temperature ...........................................................+150°C
Storage Temperature Range .................................-65°C to +150°C
Lead Temperature ................................................................+300°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Voltage Range V
IN
5.5 72 V
SHDN = high, no load (MAX6397) 118 140
SHDN = high, (MAX6398) 104 130
SHDN = low, no load (MAX6397) 37 45
Input Supply Current
SHDN = low, (MAX6398) 11 20
µA
IN Undervoltage Lockout V
IN
rising, enables GATE 4.66 5 5.50 V
IN Undervoltage Lockout
Hysteresis
V
IN
falling, disables GATE 175 mV
SET Threshold Voltage V
TH
With respect to GND 1.181 1.215 1.248 V
SET Threshold Hysteresis V
HYST
4%
SET Input Current I
SET
-50 +50 nA
Startup Response Time t
START
SHDN rising (Note 2) 100 µs
GATE Rise Time
GATE rising from GND to V
OUT
+ 8V,
C
GATE
= 6000pF, OUT = GND
1ms
SET to GATE Propagation Delay t
OV
SET rising from V
TH
- 100mV to V
TH
+
100mV
0.75 µs
V
OUT
= V
IN
= 6V, R
GATE
to IN = 1MΩ
V
IN
+
3.8V
V
IN
+
4.2V
V
IN
+
4.6V
GATE Output High Voltage V
OH
V
OUT
= V
IN
; V
IN
≥ 14V, R
GATE
to IN = 1MΩ
V
IN
+
8.5V
V
IN
+
9.2V
V
IN
+
11.5V
V
GATE Output Low Voltage V
OL
GATE sinking 20mA, V
OUT
= GND 0.38 V
GATE Charge-Pump Current I
GATE
GATE = GND 75 µA
GATE to OUT Clamp Voltage V
CLMP
13 18
V
SHDN Logic-High Input Voltage V
IH
1.4
SHDN Logic-Low Input Voltage V
IL
0.4
SHDN Input Pulldown Current
V
SHDN
= 2V, SHDN is internally pulled
down to GND
1µA
Thermal Shutdown (Note 3) +150 °C
Thermal Shutdown Hysteresis 20 °C
REGULATOR (MAX6397)
I
REG
= 1mA 40 48
Ground Current I
GND
SHDN = GND
I
REG
= 100mA 60
µA
MAX6397/MAX6398
Overvoltage Protection Switch/Limiter
Controllers Operate Up to 72V
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 14V; C
GATE
= 6000pF, C
REG
= 4.7µF, T
A
= T
J
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
= T
J
= +25°C.) (Note 1)
Note 1: Specifications to T
A
= -40°C are guaranteed by design and not production tested.
Note 2: The MAX6397/MAX6398 power up with the external FET in off mode (V
GATE
= GND). The external FET turns on t
START
after the
device is powered up and all input conditions are valid.
Note 3: For accurate overtemperature shutdown performance, place the device in close thermal contact with the external MOSFET.
Note 4: Dropout voltage is defined as V
IN
- V
REG
when V
REG
is 2% below the value of V
REG
for V
IN
= V
REG
(nominal) + 2V.
Note 5: Operations beyond the thermal dissipation limit may permanently damage the device.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
I
REG
= 1mA 4.925 5 5.120
MAX6397L/M
1mA < I
REG
< 100mA 4.85 5.15
I
REG
= 1mA 3.243 3.3 3.360
MAX6397S/T
1mA < I
REG < 100mA 3.201 3. 360
I
REG
= 1mA 2.456 2.5 2.542
MAX6397Y/Z
1mA < I
REG
< 100mA 2.41 2.55
V
I
REG
= 1mA 1.760 1.8 1.837
REG Output Voltage
(V
IN
≥ V
REG
+ 1.8V)
V
REG
MAX6397V/W
1mA < I
REG
< 100mA 1.715 1.837
5.5V ≤ VIN ≤ 72V, I
REG
= 1mA, V
REG
= 5V 0.12
Dropout Voltage (Note 4) ∆VDO
5.5V ≤ VIN ≤ 72V, I
REG
= 100mA, V
REG
= 5V 1.2
mV/V
Current Limit VIN = 14V 150 300 mA
Overvoltage-Protection Threshold V
OVP
105
% of
V
REG
O ver vol tag e- P r otecti on S i nk C ur r ent I
OVP
V
REG
= 1.1 x V
REG
(nominal) 15 mA
6.5V ≤ VIN ≤ 72V, I
REG
= 10mA, V
REG
= 5V 0.22
5.5V ≤ VIN ≤ 72V, I
REG
= 1mA, V
REG
= 5V 0.05
Line Regulation (Note 5)
∆ V
REG
/
∆V
REG
5.5V ≤ VIN ≤ 72V, I
REG
= 100mA, V
REG
= 5V 1.5
mV/V
Load Regulation
∆VREG /
∆IREG
1mA ≤ I
REG
≤ 100mA, V
REG
= 5V 0.8 mV/mA
Power-Supply Rejection Ratio I
REG
= 10mA, f = 100Hz, 0.5V
P-P
55 dB
Startup Response Time t
START
R
REG
= 500Ω, V
REG
= 5V, C
REG
= 4.7µF 180 µs
L 4.500 4.67 4.780
M 4.230 4.375 4.500
T 2.966 3.053 3.140
S 2.805 2.892 2.970
Z 2.250 2.304 2.375
Y 2.125 2.188 2.250
W 1.590 1.653 1.696
POK Assertion Threshold
(MAX6397 Only)
V
POK_TH
V 1.524 1.575 1.625
V
REG to POK Delay V
REG
rising or falling 35 µs
POK Leakage Current V
POK
= 5V 300 nA
POK Output Low Voltage V
OL
V
IN
≥ 1.5V, I
SINK
= 1.6mA, POK asserted 0.3 V
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18

MAX6397VATA+T

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Buy MAX6397VATA+T
Manufacturer:
Maxim Integrated
Description:
Supervisory Circuits Over Volt Protection Switch/Limite
Lifecycle:
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