MAX6397SATA+T Maxim Integrated Products, MAX6397SATA+T Datasheet

IC SW OVERVOLT PROT 8-TDFN

MAX6397SATA+T

Manufacturer Part Number
MAX6397SATA+T
Description
IC SW OVERVOLT PROT 8-TDFN
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of MAX6397SATA+T

Voltage - Working
72V
Technology
Mixed Technology
Power (watts)
1.45W
Number Of Circuits
1
Applications
General Purpose
Package / Case
8-TDFN Exposed Pad
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Voltage - Clamping
-
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.
19-3668; Rev 5; 1/09
FireWire is a registered trademark of Apple Computer, Inc.
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.
Automotive
Industrial
FireWire
Notebook Computers
Wall Cube Power Devices
®
________________________________________________________________ Maxim Integrated Products
Overvoltage Protection Switch/Limiter
General Description
Applications
Controllers Operate Up to 72V
Selector Guide and Typical Operating Circuit appear at end
of data sheet.
o 5.5V to 72V Wide Supply Voltage Range
o Overvoltage Protection Controllers Allow User to
o Internal Charge-Pump Circuit Ensures MOSFET
o Disconnect or Limit Output from Input During
o Adjustable Overvoltage Threshold
o Thermal-Shutdown Protection
o Always-On, Low-Current (37µA) Linear Regulator
o Fully Specified from -40°C to +125°C (T
o Small, Thermally Enhanced 3mm x 3mm TDFN
* 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.
MAX6397_ATA-T*
MAX6398ATT-T*
Pin Configurations continued at end of data sheet.
Size External n-Channel MOSFETs
Gate-to-Source Enhancement for Low R
Performance
Overvoltage Conditions
Sources Up to 100mA (MAX6397)
Package
PART
TOP VIEW
*EXPOSED PAD. CONNECT TO GND.
-40°C to +125°C
-40°C to +125°C
TEMP RANGE
Ordering Information
REG
1
IN
*EP
8
Pin Configurations
SHDN
OUT
MAX6397
7
2
TDFN
GATE
SET
3
6
GND
POK
4
5
PIN-PACKAGE
8 TDFN-EP**
6 TDFN-EP**
Features
J
DS(ON)
)
1

Related parts for MAX6397SATA+T

MAX6397SATA+T Summary of contents

Page 1

... FireWire Notebook Computers Wall Cube Power Devices FireWire is a registered trademark of Apple Computer, Inc. ________________________________________________________________ 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. Controllers Operate Up to 72V o 5.5V to 72V Wide Supply Voltage Range ...

Page 2

Overvoltage Protection Switch/Limiter Controllers Operate Up to 72V ABSOLUTE MAXIMUM RATINGS (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 ...

Page 3

Overvoltage Protection Switch/Limiter ELECTRICAL CHARACTERISTICS (continued 14V 6000pF 4.7µ GATE REG PARAMETER SYMBOL REG Output Voltage ≥ 1.8V) IN REG Dropout Voltage (Note 4) Current Limit Overvoltage-Protection Threshold O ...

Page 4

Overvoltage Protection Switch/Limiter Controllers Operate Up to 72V (V = 14V 4.7µ unless otherwise noted.) IN REG REG SUPPLY CURRENT vs. INPUT VOLTAGE 160 MAX6397 GATE ON 140 120 100 ...

Page 5

Overvoltage Protection Switch/Limiter (V = 14V 4.7µ unless otherwise noted.) IN REG REG GATE-TO-OUT CLAMP VOLTAGE vs. TEMPERATURE 17.0 16.9 16.8 16.7 16.6 16.5 16.4 16.3 16.2 16.1 16.0 -50 - ...

Page 6

Overvoltage Protection Switch/Limiter Controllers Operate Up to 72V (V = 14V 4.7µ unless otherwise noted.) IN REG REG OVERVOLTAGE SWITCH FAULT 200µs/div TRANSIENT RESPONSE C = 10µF REG I = 10mA REG 400µs/div REGULATOR STARTUP ...

Page 7

Overvoltage Protection Switch/Limiter PIN NAME MAX6397 MAX6398 SHDN SET 4 — POK 5 4 GND 6 5 GATE 7 6 OUT 8 — REG — — EP Detailed Description The MAX6397/MAX6398 are ultra-small, ...

Page 8

Overvoltage Protection Switch/Limiter Controllers Operate Up to 72V IN UVLO 5V SET 1.23V LINEAR REGULATOR MAX6397 MAX6398 V POK_TH MAX6397 ONLY Figure 1. Functional Diagram The MAX6397 integrates a high-input-voltage, low-qui- escent-current linear regulator in addition to an over- voltage ...

Page 9

Overvoltage Protection Switch/Limiter 10ms/div Figure 2a. MAX6397/MAX6398 GATE Waveform During Over- voltage Switch Mode 4ms/div Figure 2b. MAX6397/MAX6398 GATE Waveform During Over- voltage Limit Mode GATE cycles on-off-on-off- sawtooth waveform until OUT remains below the overvoltage fault threshold ...

Page 10

Overvoltage Protection Switch/Limiter Controllers Operate Up to 72V GATE V IN OUT BATT MAX6397 MAX6398 SET GND Figure 4. Overvoltage Limiter Protection Switch Configuration As the transient begins decreasing, OUT fall time will depend on the MOSFET’s GATE charge, the ...

Page 11

Overvoltage Protection Switch/Limiter GATE IN IN OUT MAX6397 MAX6398 SET GND Figure 6. Setting the MAX6397/MAX6398 Overvoltage Threshold IN GATE V BATT MAX6397 MAX6398 OUT GND (a) Figure 7. Reverse Battery Protection Using a Diode or p-Channel MOSFET Reverse-Battery Protection ...

Page 12

Overvoltage Protection Switch/Limiter Controllers Operate Up to 72V IN GATE C GATE V BATT MAX6397 MAX6398 OUT GND Figure 8. MAX6397/MAX6398 Controlling GATE Inrush Current REG Capacitor Selection for Stability For stable operation over the full temperature range and with ...

Page 13

Overvoltage Protection Switch/Limiter V MAX BATT IN GATE OUT 60V TVS MAX6397 MAX6398 SET GND Figure 10. Power Dissipated Across MOSFETs During an Overvoltage Fault (Overvoltage Limiter Mode) Select external MOSFETs according to the application ...

Page 14

Overvoltage Protection Switch/Limiter Controllers Operate Up to 72V 180 THERMAL SHUTDOWN OUT T = +125°C A 170 GATE 160 150 C GATE 140 C = InF GATE 130 C = ADDITIONAL CAPACITANCE GATE FROM ...

Page 15

Overvoltage Protection Switch/Limiter An additional capacitor can be added to GATE and GND to shift the curves as this increases ∆t1. These val- ues are used for illustration only. Customers must verify worst-case conditons for their specific application. 2.0 1.455W ...

Page 16

Overvoltage Protection Switch/Limiter Controllers Operate Up to 72V GATE V IN OUT BATT MAX6397 MAX6398 REG SET GND OVERVOLTAGE LIMITER CONTROLLER Pin Configurations (continued) TOP VIEW OUT GATE 6 5 *EP MAX6398 SHDN TDFN *EXPOSED PAD. CONNECT ...

Page 17

Overvoltage Protection Switch/Limiter Chip Information TRANSISTOR COUNT: 590 PROCESS: BiCMOS ______________________________________________________________________________________ Controllers Operate Up to 72V For the latest package outline information and land patterns www.maxim-ic.com/packages. PACKAGE TYPE 6 TDFN 8 TDFN Package Information PACKAGE CODE DOCUMENT NO. ...

Page 18

... 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. 18 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2009 Maxim Integrated Products DESCRIPTION is a registered trademark of Maxim Integrated Products, Inc ...

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