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General Description

The MAX6495 evaluation kit (EV kit) demonstrates a

high-voltage overvoltage protection circuit for automo-

tive applications that must survive load dump and high-

voltage transient conditions. This EV kit is a fully assem-

bled and tested surface-mount board.

This EV kit supports high output currents of up to 5A,

operates at voltages up to 72V, and withstands temper-

atures ranging from -40°C to +105°C. Two alternate

voltage inputs implement two different schemes for

reverse-battery protection.

Features

♦ 5.5V to 72V Wide Supply Voltage Range

♦ Up to 5A Output Current Capacity

♦ Selectable Overvoltage Mode and Overvoltage

Limiter Mode

♦ Adjustable Overvoltage Threshold

♦ 100V Reverse-Battery Protection

Evaluates: MAX6495

MAX6495 Evaluation Kit

________________________________________________________________ Maxim Integrated Products 1

19-4002; Rev 2; 12/06

Component List

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Ordering Information

PART TEMP RANGE IC PACKAGE

MAX6495EVKIT

-40°C to +105°C 6 TDFN-EP*

DESIGNATION QTY DESCRIPTION

C1, C7 2

22µF, 100V aluminum electrolytic

capacitors

Vishay 222215369229

C2, C8–C12 0 Not installed, capacitors

C3 1 Not installed, capacitor (1206)

C6 1

0.1µF, 100V X7R ceramic capacitor

TDK C3216X7R2A104K or

AVX 12061C104KAT2A

C13 1 Not installed, electrolytic capacitor

D1 1

8A/100V Schottky diode

International Rectifier 8TQ100S or

ST Microelectronics STPS8H100G

D2 1

60V, 600W TVS diode

Diodes SMBJ54A or

Fairchild SMBJ54A

D3 1

18V zener diode

Central Semi CMPZ5248B or

Diodes MMBZ5248BT

D4 1

Not installed, optional TVS diode

(DO-15)

DESIGNATION QTY DESCRIPTION

J1 0 Not installed, 2-pin header

J2, J3, J4 3 3-pin headers

M1 1

100V, 33A n-channel MOSFET

International Rectifier IRF540NS or

Fairchild FQB33N10

M2 1

100V, 23A p-channel MOSFET

International Rectifier IRF9540NS or

Fairchild FQB22P10

R1 1 649kΩ ±1% resistor (0805)

R2 1 49.9kΩ ±1% resistor (0805)

R4 1 Not installed, resistor (0805)

R5 1 100kΩ ±1% resistor (0805)

R6 1 2.2MΩ ±1% resistor

U1 1 MAX6495ATT (6-pin TDFN)

— 1 PCB: MAX6495EVKIT

*EP = Exposed paddle.

Summary of content (7 pages)

PAGE 1
9-4002; Rev 2; 12/06 MAX6495 Evaluation Kit The MAX6495 evaluation kit (EV kit) demonstrates a high-voltage overvoltage protection circuit for automotive applications that must survive load dump and highvoltage transient conditions. This EV kit is a fully assembled and tested surface-mount board. This EV kit supports high output currents of up to 5A, operates at voltages up to 72V, and withstands temperatures ranging from -40°C to +105°C.
PAGE 2
Evaluates: MAX6495 MAX6495 Evaluation Kit Quick Start The MAX6495 EV kit is fully assembled and tested. Follow these steps to verify operation. Caution: Do not turn on the power supply until all connections are completed. 1) Connect a DC power supply (0 to 20V or above, 5A or depending on load) to VIN1 and GND. 2) Connect a voltmeter or oscilloscope and a load (if desired) to OUT and GND. 3) Make sure the J2 shunt connects pins 1-2 (overvoltage-protect mode). The J4 shunt should connect pins 1-2.
PAGE 3
MAX6495 Evaluation Kit Three-pin jumper J2 selects between overvoltage mode and overvoltage limiter mode; do not leave this jumper unconnected. Three-pin jumper J3 controls the gate drive of p-channel MOSFET M3 used as a reverse-battery protection. Use J3 to disconnect resistor R5 when M3 is not used to avoid supply leakage through R5. Three-pin jumper J4 controls the SHDN pin of the MAX6495 and can enable or disable the MOSFET M1 enhancement. Table 1 lists the jumper options. Table 1.
PAGE 4
GND VIN3 VIN2 VIN1 R5 100kΩ D3 18V 3 2 1 J3 1 J4 2 3 R6 2.2MΩ M2 IRF9540 D1 8TQ100S-IS J1 D2 SMBJ54A C6 0.1µF 100V R2 49.9kΩ 3 2 1 J2 J2 1 2 3 C1 22µF 100V R1 649kΩ R4 OPEN D4 OPEN GND GATE U1 OUTFB C3 OPEN C10 OPEN MAX6495 OVSET SHDN IN C2 OPEN 4 5 6 C11 OPEN M1 IRF540 C7 22µF 100V C8 OPEN C9 OPEN C12 OPEN C13 OPEN GND OUT Evaluates: MAX6495 MAX6495 Evaluation Kit Figure 1.
PAGE 5
MAX6495 Evaluation Kit Evaluates: MAX6495 Figure 2.
PAGE 6
Evaluates: MAX6495 MAX6495 Evaluation Kit Figure 3.
PAGE 7
MAX6495 Evaluation Kit Evaluates: MAX6495 Figure 4. MAX6495 EV Kit PCB Layout—Solder Side Revision History Pages changed at Rev 1: 1–7 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.