CS4412A-CNZR Cirrus Logic Inc, CS4412A-CNZR Datasheet - Page 20

• Manufacturer Part Number: CS4412A-CNZR
• Description: IC,Audio Amplifier,QUAD,LLCC,48PIN,PLASTIC
• Manufacturer: Cirrus Logic Inc
• Series: Popguard®r
• Type: Class Dr

Specifications of CS4412A-CNZR

• Output Type: 2-Channel (Stereo) or 4-Channel (Quad)
• Max Output Power X Channels @ Load: 30W x 1 @ 4 Ohm; 15W x 2 @ 8 Ohm
• Voltage - Supply: 8 V ~ 18 V
• Features: Depop, Short-Circuit and Thermal Protection, Standby
• Mounting Type: Surface Mount
• Package / Case: 48-QFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 598-1581 - REFERENCE DESIGN FOR CS4412A
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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5. POWER SUPPLY, GROUNDING, AND PCB LAYOUT
5.1
5.1.1
5.2
Power Supply and Grounding
The CS4412A requires careful attention to power supply and grounding arrangements if its potential perfor-
mance is to be realized.
Extensive use of power and ground planes, ground plane fill in unused areas, and surface mount decoupling
capacitors are recommended. It is necessary to decouple the power supply by placing capacitors directly
between the power and ground of the CS4412A. Decoupling capacitors should be as close to the pins of
the CS4412A as possible. The lowest value ceramic capacitor should be closest to the pin and should be
mounted on the same side of the board as the CS4412A to minimize inductance effects. The CRD4412A
reference design demonstrates the optimum layout and power supply arrangements.
QFN Thermal Pad
The CS4412A is available in a compact QFN package. The underside of the QFN package reveals a large
metal pad that serves as a thermal relief to provide for maximum heat dissipation. This pad must mate with
an equally dimensioned copper pad on the PCB and must be electrically connected to ground. A series of
thermal vias should be used to connect this copper pad to one or more larger ground planes on other PCB
layers; the copper in these ground planes will act as a heat sink for the CS4412A. The CRD4412A reference
design demonstrates the optimum thermal pad and via configuration.
Integrated VD Regulator
The CS4412A includes an internal linear regulator to provide a fixed
age for its internal digital logic. The LVD pin must be set to indicate the voltage present on the VD pin as
shown in
The output of the digital regulator is presented on the VD_REG pin and may be used to provide an exter-
nal device with up to
If a nominal supply voltage of 2.5 V is used as the VD supply (see the
tions
uration, the internal regulator is bypassed and the external supply source is used to directly drive the
internal digital logic.
table on
Table 9
VD Connection
page
3.3 V Supply
2.5 V Supply
5 V Supply
below.
5), the VD and VD_REG must be connected to the VD supply source. In this config-
3 mA
Table 9. Power Supply Configuration and Settings
of current at its nominal output voltage of
VD and Bypass Capacitors
VD_REG Connection
Bypass Capacitors Only
Bypass Capacitors Only
LVD Connection
2.5 V
2.5
GND
GND
Recommended Operating Condi-
VD
V.
supply from the VD supply volt-
CS4412A
DS786A2