© Semiconductor Components Industries, LLC, 2006
February, 2006 − Rev. 0
1 Publication Order Number:
NCP2821/D
NCP2821
2.65 W Filterless with
Selectable Gain Class−D
Audio Amplifier
NCP2821 is a cost effective mono audio power amplifier designed
for portable communication device applications such as mobile
phones. The internal gain setting between 6 dB and 12 dB will also
save external gain setting resistors. To achieve a typical audio mono
application, you only need an external capacitor for filtering the power
supply. The NCP2821 processes analog inputs with a PWM technique
that lowers significantly output noise and THD.
This part is capable of delivering 2.65 W of continuous average
power to a 4.0 BTL load from a 5.0 V power supply. Operating on a
single 3 V supply, the output power stage can provide 500 mW to an
8.0 BTL load with less than 1% THD+N. For cellular handsets or
PDAs it offers space and cost savings because no output filter is
required when using inductive transducers. Its improved Class−D
technology makes it suitable for portable devices. With 90%
efficiency and very low shutdown current, it increases widely the
lifetime of your battery compared to a ClassAB solution. It also
minimizes the junction temperature.
It fully rejects “pop & click” noises with a fast start−up time of 9 ms.
Added to a −65 dB PSRR, the NCP2821 audio power amplifier is
specifically designed to provide high quality output power from low
supply voltage, requiring only 1 external capacitor.
Features
• Optimized PWM Output Stage: Filterless Capability
• Selectable Gain of 6 dB or 12 dB: No Need for External Gain Setting
Resistors
• Efficiency up to 90% and Low Quiescent Current
Maximum Battery Life and Minimum Heat
• High Output Power Capability: 1.4 W with 8.0 Load
• Wide Supply Voltage Range: 2.5−5.5 V Operating Voltage
• High Performance, THD+N of 0.05%
• Excellent PSRR (−65 dB): No Need for Voltage Regulation
• Surface Mounted Package 9−Pin Flip−Chip CSP
• Fully Differential Capability: No Need for Input Coupling Capacitor
• Very Fast Turn On Time: 9.0 ms (typ)
• “Pop and Click” Noise Protection Circuitry
Applications
• Cellular Phone
• Personal Computer
• PDAs
• Portable Electronic Devices
http://onsemi.com
9−PIN FLIP−CHIP CSP
FC SUFFIX
CASE 499AL
1
MARKING
DIAGRAM
MAU = Device Code
A = Assembly Location
Y = Year
WW = Work Week
G = Pb−Free Package
MAUG
AYWW
A1
OUTM
OUTP
1 F
GND
SD
INP
INM
VP
Input from
Micro
controller
Audio
Input
from
DAC
2.7 mm
1.6 mm
Cs
See detailed ordering and shipping information on page 18 o
this data sheet.
ORDERING INFORMATION
PIN CONNECTIONS
9−Pin Flip−Chip CSP
A3
B3
C3
A2
B2
C2
A1
B1
C1
GSINP OUTM
VP
SD OUTP
GND
INM
VP
(Top View)
GS
