MAX13326 Maxim Integrated Products, MAX13326 Datasheet - Page 19

• Manufacturer Part Number: MAX13326
• Description: Dual Automotive Audio Line Drivers
• Manufacturer: Maxim Integrated Products

Figure 8. A Burst Read Operation
Use ceramic capacitors with a low ESR for optimum per-
formance. For optimal performance over the extended
temperature range, select capacitors with an X7R
dielectric. Table 19 lists suggested manufacturers.
The value of the flying capacitor (see the Typical
Operating Circuit) affects the charge pump’s load regu-
lation and output resistance. A C1 value that is too small
degrades the device’s ability to provide sufficient current
drive, which leads to a loss of output voltage. Increasing
the value of C1 improves load regulation and reduces
the charge-pump output resistance. For optimum perfor-
mance, use a 470nF capacitor for C1.
The hold capacitor value (see the Typical Operating
Circuit) and ESR directly affect the ripple at the internal
negative rail. Increasing the value of C2 reduces output
ripple. Likewise, decreasing the ESR of C2 reduces both
ripple and output resistance. Lower capacitance values
can be used in systems with low maximum output power
levels. For optimum performance, use a 1FF capacitor
for C2.
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
V
cally close to the V
Table 19. Suggested Capacitor Vendors
DD
Murata
Taiyo Yuden
TDK
with C3, the same value as C2, and place it physi-
SUPPLIER
Power-Supply Bypass Capacitor (C3)
______________________________________________________________________________________
DD
Charge-Pump Capacitor Selection
Sr
S
and PGND pins.
S7
S7
Dual Automotive, Audio Line Drivers
S6
S6
770-436-1300
800-348-2496
847-803-6100
SLAVE ADDRESS
SLAVE ADDRESS
S5
S5
Flying Capacitor (C1)
PHONE
Hold Capacitor (C2)
S4
S4
with I
S3
S3
S2
S2
S1
S1
2
ACK
R/W
R/W
= 0
= 1
C Control and Diagnostic
ACK
ACK
B7
770-436-3030
847-925-0899
847-390-4405
With minimal external components, the MAX13325/
MAX13326 can be protected against automotive load-
dump conditions. See the Typical Operating Circuit.
Q1 should be selected to withstand the full-voltage
exposure (BV
age should be chosen to be less than V
initial startup. Using an external nMOS, RTR020N05,
300ms duration component provides 50V load-dump
protection.
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.
Normally, a series resistor for current limitation is needed
during short-to-battery condition. R1 should be chosen
according to (18V - V
excessive current is being drawn from CHOLD.
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.
B7
B7
B6
FAX
B6
B6
B5
B5
B5
B4
DATA N
REGISTER ADDRESS
B4
B4
B3
DSS
DATA 1
www.murata.com
www.t-yuden.com
www.component.tdk.com
B3
B3
B2
> 45V). The gate-source turn-on volt-
B2
B2
B1
DD(min)
B1
B1
B0 NACK
Load-Dump Protection
Layout and Grounding
- V
B0
B0
WEBSITE
ZENER
www.DataSheet4U.com
ACK
ACK
P
Series Resistor (R1)
Zener Diode (D1)
)/1mA so that no
nMOSFET (Q1)
CPS
to ensure
19