Document
AUD4990 2W Audio Power Amplifier with Selectable Shutdown
October 2008
AUD4990 2W Audio Power Amplifier with Selectable Shutdown
General Description
The AUD4990 is an audio power amplifier for mobile phone and other portable electronic device applications. It can deliver 1.3 watts of continuous average power to an 8 ohm BTL (bridge tied load) and 2 watts of continuous average power to a 4 ohm BTL, with less than 1% distortion from a 5V DC power supply. The AUD4990 is specifically designed to provide high output power with a minimal amount of external components. It requires no output coupling capacitors, for instance. Because of its space-saving footprint, it perfectly meets the needs of mobile phones, PDAs, notebook computers and other low-voltage applications that require small power sources in a small package. The AUD4990 can offer a low standby current and a zero shutdown current. Furthermore, the amplifier’s startup time is fast enough to use its shutdown mode as a mute function. The AUD4990 features circuitry that eliminates pop-and-click noise whenever the device is turned on or off.
Key Specifications
Wide Power Supply Voltage Range Typical THD at 1W, 8Ω High PSRR Low Quiescent Current 2.7V < VDD < 5.5 0.2% (typ) 68 dB (typ) 2.5 mA (typ)
Features
Space Saving Thermal Package Active High or Low Shutdown Mode External Gain Configuration Stable Unity Gain Can Drive CL up to 200pF
Applications
Mobile Phones PDAs Notebook Computers Portable Electronic Devices
Typical Application
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100
VDD RF 20k Ω Audio Input Ci 0.39 µ F Ri 20kΩ
+ CS 1.0 µF
10
- IN + IN _ + 20kΩ 20kΩ _
BIAS
VO1 -
RL 8Ω VO2 +
THD + N (%)
1
Bypass
+ CB 1.0µF
V DD/2
+
Shutdown
Shutdown Mode GND GND V DD V DD 0 1 0 1
Control
Status Shutdown On On Shutdown
ShutDown SD Mode
0.1
ShutDown
GND
0.01 -4 10
10 -3
10 -2
10-1
100
Output Power (W)
Figure 1 Audio Power Amplifier with AV = 2
Figure 2 THD + N vs Output Power
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AUD4990 2W Audio Power Amplifier with Selectable Shutdown
Pin Assignment
AUD4990D10-3 (Bottom View)
AUD4990D10-4 (Bottom View)
Pin No. 1 2 3 4 5 6 7 8 9 10
Pin Name SD BYPASS SD MODE + IN - IN VO1 -VDD GND VO2
Type I I I I I O -I I O
Description Shutdown Selection Pin Common Mode Voltage Shutdown Mode Selection Pin Positive Differential Input Negative Differential Input Negative BTL Output NC Pin Power Supply Ground Positive BTL Output
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Pin Assignment (continuous)
AUD4990 2W Audio Power Amplifier with Selectable Shutdown
1 2 3 4
8 7 6 5
AUD4990MS08 (Top View)
Pin No. 1 2 3 4 5 6 7 8
Pin Name SD BYPASS + IN - IN VO1 VDD GND VO2
Type I I I I O I I O
Description Shutdown Selection Pin Common Mode Voltage Positive Differential Input Negative Differential Input Negative BTL Output Power Supply Ground Positive BTL Output
*SD MODE pin shorted to GND in the MSOP8 package
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AUD4990 2W Audio Power Amplifier with Selectable Shutdown
Pin Assignment (continuous)
C 3 2 1
AUD4990CS09 (Ball View)
B
A
Pin No. A1 A2 A3 B1 B2 B3 C1 C2 C3
Pin Name - IN VO1 + IN SD MODE GND VDD BYPASS VO2 SD
Type I O I I I I I O I
Description Negative Differential Input Negative BTL Output Positive Differential Input Shutdown Mode Selection Pin Ground Power Supply Common Mode Voltage Positive BTL Output Shutdown Selection Pin
Operation Conditions
Parameter Power Supply Voltage Operating Temperature Range Symbol VDD TA Min 2.7 -40 Typ Max 5.5 85 Unit V °C
Ordering Information
Part Number AUD4990D10-3 AUD4990D10-4 AUD4990MS08 AUD4990CS09
+ WXYZ = assembly and date code
Package 10-lead DFN 3x3 (Pb-Free) 10-lead DFN 4x3 (Pb-Free) 8-lead MSOP8 (Pb-Free) 9-Ball CSP09 (Pb-Free)
Marking
+
A4990D WXYZ A4990D WXYZ A4990M WXYZ 4990 WXYZ
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Absolute Maximum Ratings
If Military/Aerospace specified devices are required, please contact the Analog Express Sales Office/Distributors for availability and specifications. Supply Voltage Storage Temperature Input Voltage Power Dissipation ESD Susceptibility Junction Temperature 6.0V -65° C to +150° C -0.3V to VDD + 0.3V Internally Limited HBM 2000V 150° C Thermal Resistance θJC (DFN10 4x3) θJA (DFN10 4x3) θJC (DFN10 3x3) θJA (DFN10 3x3)
AUD4990 2W Audio Power Amplifier with Selectable Shutdown
63° C/W 12° C/W 55° C/W 10° C/W
Electrical Characteristics, VDD = 5V
The following specifications apply for the circuit shown in Figure 1, unless otherwise specified. Limits apply for TA = 25° C.
AUD4990 Symbol Parameter Conditions
VIN = 0V, IO = 0A, No Load VIN = 0V, IO = 0A, 8Ω Load VSD = VSD Mode
Typical
2.5 3.5 0.1
Limit
7.5 9 2.0 25
Units (Limits)
mA (max) mA (max) µA (max) mV (max) kΩ (max) kΩ (min) W W
IDD
Quiescent Power Supply Current Shutdown Current Output Offset Voltage Resistor Output to GND
ISD VOS ROUT
8.5
9.7 7.0
PO
Output Power (8Ω) .