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TPA2005D1
SLOS369B – JULY 2002 – REVISED DECEMBER 2002
1.1 W MONO FILTER FREE CLASS D AUDIO POWER AMPLIFIER
FEATURES
D
Maximum Battery Life and Minimum Heat
– Efficiency With an 8-Ω Speaker:
– 84% at 400 mW
– 79% at 100 mW
– 2.8-mA Quiescent Current
– 0.5-µA Shutdown Current
APPLICATIONS
D
Ideal for Wireless or Cellular Handsets and
PDAs
DESCRIPTION
The TPA2005D1 is a 1.1-W high efficiency filter-free
class-D audio power amplifier in a MicroStar Junior
BGA package that requires only three external
components.
Features like 84% efficiency, –71-dB PSRR at 217 Hz,
improved RF-rectification immunity, and 15 mm
2
total
PCB area make the TPA2005D1 ideal for cellular
handsets. A fast start-up time of 9 ms with minimal pop
makes the TP2005D1 ideal for PDA applications.
In cellular handsets, the earpiece, speaker phone, and
melody ringer can each be driven by the TPA2005D1.
The device allows independent gain control by
summing the signals from each function while
minimizing noise to only 48
µV
RMS
.
D
Only Three External Components
– Optimized PWM Output Stage Eliminates
LC Output Filter
– Internally Generated 250-kHz Switching
Frequency Eliminates Capacitor and
Resistor
– Improved PSRR (–71 dB at 217 Hz) and
Wide Supply Voltage (2.5 V to 5.5 V)
Eliminates Need for a Voltage Regulator
– Fully Differential Design Reduces RF
Rectification and Eliminates Bypass
Capacitor
– Improved CMRR Eliminates Two Input
Coupling Capacitors
APPLICATION CIRCUIT
To Battery
Internal
Oscillator
+
Differential
Input
–
RI
IN–
_
RI
+
IN+
GND
SHUTDOWN
Bias
Circuitry
TPA2005D1
PWM
H–
Bridge
VDD
CS
VO+
VO–
Actual Solution Size
(MicroStar Junior BGA)
CS
RI
RI
6 mm
2.5 mm
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments
semiconductor products and disclaimers thereto appears at the end of this data sheet.
MicroStar Junior is a trademark of Texas Instruments.
This document contains information on products in more than one phase of
development. The status of each device is indicated on the page(s) specifying its
electrical characteristics.
Copyright
2002, Texas Instruments Incorporated
TI [ TEXAS INSTRUMENTS ]
