MAX13325 Datasheet, PDF(20/21 Page) Maxim Integrated Products – Dual Automotive, Audio Line Drivers with I2C Control and Diagnostic

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Dual Automotive, Audio Line Drivers

with I2C Control and Diagnostic

Power-Supply Bypass Capacitor (C3)

The power-supply bypass capacitor (see the Typical

Operating Circuit) lowers the output impedance of the

power supply, and reduces the impact of the MAX13325/

MAX13326 charge-pump switching transients. Bypass

VDD with C3, the same value as C2, and place it physi-

cally close to the VDD and PGND pins.

Load-Dump Protection

With minimal external components, the MAX13325/

MAX13326 can be protected against automotive load-

dump conditions. See the Typical Operating Circuit.

nMOSFET (Q1)

Q1 should be selected to withstand the full-voltage expo-

sure (BVDSS > 45V). The gate-source turn-on voltage

should be chosen to be less than VCPS to ensure initial

startup. Using an external nMOS, RTR020N05, 300ms

duration component provides 50V load-dump protection.

Zener Diode (D1)

During short-to-battery condition, OUT_ lifts up CHOLD

using an internal diode. In order not to violate the maxi-

mum gate-source voltage of Q1, a zener diode of appro-

priate clamping voltage should be added between the

gate and source terminals.

Series Resistor (R1)

Normally, a series resistor for current limitation is needed

during short-to-battery condition. R1 should be chosen

according to (18V - VDD(min) - VZENER)/1mA so that no

excessive current is being drawn from CHOLD.

Layout and Grounding

Proper layout and grounding are essential for optimum

performance. Connect the EP and GND together at a

single point on the PCB. Ensure ground return resistance

is minimized for optimum crosstalk performance.

PROCESS: BCD

Chip Information

Package Information

For the latest package outline information and land pat-

terns, go to www.maxim-ic.com/packages. Note that

a â+â, â#â, or â-â in the package code indicates RoHS

status only. Package drawings may show a different suf-

fix character, but the drawing pertains to the package

regardless of RoHS status.

PACKAGE PACKAGE OUTLINE LAND PATTERN

TYPE

CODE

NO.

28 TSSOP-EP U28E+5

21-0108

90-0147

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