KBA2338 Datasheet, PDF (1/16 Pages) Kingbor Technology Co – 3W F ilterless C lass-D Audio Power Amplifie r

Kingbor Technology Co.,Ltd
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KBA2338
3 W F ilte rle ss C la ss-D Audio P owe r Am plifie r
General Description
The kB2338A is a high efficiency, 3W mono class-D audio
power amplifier. A low noise, filterless PWM architecture
eliminates the output filter, reducing external component
count, system cost, and simplifying design.
Operating in a single 5V supply, kB2338A is capable of
driving 4ȍ speaker load at a continuous average output of
3W/10% THD+N or 2W/1% THD+N. The kB2338A has
high efficiency with speaker load compared to a typical
class AB amplifier. With a 3.6V supply driving an 8ȍ
speaker , the efficiency for a 400mW power level is 88%.
In cellular handsets, the earpiece, speaker phone, and
melody ringer can each be driven by the kB2338A. The
gain of kB2338A is externally configurable which allows
independent gain control from multiple sources by
summing signals from seperate sources.
The kB2338A is available in space-saving WCSP and
DFN packages.
1
9ïPIN FLIPïCHIP WCSP
MARKING
DIAGRAMS
A3
C3
A20
5
A1
C1
8
1
8 PIN UDFN 2x2.2
SD ¹
NC ²
INP ³
INM ⁴
8 _OUTM
7 _GND
6 _VP
5 OUTP
Features
z Unique Modulation Scheme Reduces EMI Emissions
z Efficiency at 3.6V With an 8-ȍ Speaker:
í 88% at 400 mW
í 80% at 100 mW
z Low 2.38-mA Quiescent Current and
0.5-µA Shutdown Current
z 2.5V to 6.0V Wide Supply Voltage
z Optimized PWM Output Stage Eliminates
LC Output Filter
z Improved PSRR (í72 dB) Eliminates Need for a
Voltage Regulator
z Fully Differential Design Reduces RF Rectification
and Eliminates Bypass Capacitor
z Improved CMRR Eliminates Two Input
Coupling Capacitors
z Internally Generated 250-kHz Switching Frequency
z Integrated Pop and Click Suppression Circuitry
z 1.5mm u 1.5mm Wafer Chip Scale Package (WCSP)
and 3mm u 3mm DFN-8 package
z RoHS compliant and 100% lead(Pb)-free
Applications
• Cellular Phone
• Portable Electronic Devices
• PDAs and Smart Phones
• Portable Computer
Ordering Information
Order Number
kBA2338B-UDFN
Package Type
UDFN-8
kBA2338-WCSP
WCSP-9
Marking
xxxx
A20 5
Operating Temperature range
-40 °C to 85°C
-40 °C to 85°C
March 2007
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