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WAA2890
1.28 Watt Audio Power Amplifier
Features
- Improved PSRR at 217 Hz & 1 KHz 62 dB- Power output at
5.0V, 1% THD+N, 8 1.28 W (typ.)- Power output at 3.0V, 1% THD+N, 8
440 mW (typ.)- Ultra low shutdown current 0.1 uA (typ.)- 2.2V 5.5V
operation- Improved circuitry eliminates pop-click noise during
turn-on and turn-off transitions- No output coupling capacitors,
snubber networks or
bootstrap capacitors required- Unity-gain stable- External gain
configuration capability
- Available in space-saving packages: MSOP8, 9 BumpWLCSP
Applications
Wireless handsetsPortable electronic devicesPDAs, Handheld
computers
PIN CONFIGURATIONWLCSP MSOP8 SYMB
OLI/O DESCRIPTION
A1 4 INN I Negative InputA2 5 V OUT1 0 Negative BTL outputA3 3
INP I Positive InputB1 N/A I Core Analog GroundB2 7 GND I GroundB3
6 V DD I Power Supply
(2.2-5.5V)C1 2 BP I Analog Ground for
inner OPAs. Itsabout a half of V DD .
C2 8 V OUT2 O Positive BTL OutputC3 1 SHD I Shut down
Logical
Control, 0 is active
http://www.willsemi.com Page 1 2/4/2008 Rev2.2
9 Pin WL CSP
PIN CONNECTIONS
x = Specific
Device Code,B
G = AssemblyLocation
M = Year
WW, W = Work Week
MARKINGDIAGRAMS
8
7
6
5
1
2
3
4
MSOP8
1
8
BP
INP
INN
OUT 2
GND
VDD
OUT1
MWWx BG
1
8
9 Pin WLCSP
MSOP8
(Top View)
1
.
MWWxAG
A1
A3
C1
A3
B3
C3
A2
B2
C2
A1
B1
C1
INM OUTA INP
VM_P VM Vp
BYPASS OUTB SHUTDOWN
SHUTDOWN
(Top View)
WAA2890
General Description
The WAA2890 is a Class-AB audio power amplifierdesigned for
mobile phones and other portablecommunication devices. It is
capable of delivering 1.28watts of continuous average power to an 8
BTL load withless than 1% distortion (THD+N) from a 5VDC
powersupply.
The WAA2890 was designed specifically to provide high
quality output power with a minimal amount of
externalcomponents. It does not require output couplingcapacitors
or bootstrap capacitors. And with ultra lowshutdown current, the
WAA2890 is ideally suited formobile phone and other low voltage
applications whereminimal power consumption is a primary
requirement.With special pop-click eliminating circuit, the
WAA2890
provides perfect pop-click characteristic during turn-onand
turn-off transitions.
The WAA2890 is unity-gain stable and can beconfigured by
external gain-setting resistors.
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WAA2890
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Figure 1. Typical Audio Amplifier Application Circuit with
Single Ended Input
+
+
VpINN
Vp
Vp
300 k
300 k
8
OUTA
OUTB
R120 k
R220 k
INP
BYPASS
20 k
1 F
390 nF
VMVM_P
SHUTDOWNCONTROL
Cbypass
20 k
1 FCs
SHUTDOWN
Rf
RiCiAUDIOINPUT
VIH
VIL
Figure 2. Typical Audio Amplifier Application Circuit with a
Differential Input
+
+
VpINN
Vp
Vp
300 k
300 k
8
OUTA
OUTB
R120 k
R220 k
INP
BYPASS
20 k
1 F
390 nF
VMVM_P
SHUTDOWNCONTROL
Cbypass
20 k
1 FCs
SHUTDOWN
Rf
RiCi
AUDIOINPUT
VIH
VIL
20 k390 nF
RiCi
+
20 k Rf
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WAA2890
Absolute Maximum RatingsSupply Voltage -0.3V to 6VInput Voltage
-0.3V to V DD+0.3VPower Dissipation
See Dissipation Rating TableESD Susceptibility (Human body
model)
4000VJunction Temperature -40 to +150 Storage Temperature -65 to
+150 Resistance
JC(MSOP8) 56/WJA(MSOP8) 190/WJA(9-BUMP) 180/W
Operating Ratings
Temperature Range -40 TA 85Supply Voltage 2.2 VDD 5.5V
NOTE: Absolute Maximum Ratings indicate limits beyondwhich
damage to the device may occur. Operating Ratingindicate conditions
for which the device is functional, but do notguarantee specific
performance limits.
Electrical CharacteristicsThe following specifications apply for
the circuit shown in Figure 1, unless otherwise specified.Limits
apply for T A = 25
V DD = 5V
SpecSymbol Parameter Conditions
Min. Typ. Max.Units
VIN = 0V, 8 Load 2.4 8 mAIDD Quiescent Power Supply Current
VIN = 0V, No Load 2.1 7 mA
ISD Shutdown Current VIN=0V, VSHD=GND, No Load 0.1 2 uA
VSDIH Shutdown Voltage Input High 1.58 V
VSDIL Shutdown Voltage Input Low 1.36 VVOS Output Offset Voltage
-50 6 50 mV
THD+N Total Harmonic Distortion + Noise Po=0.5Wrms, f=1KHz, 0.04
%
PO Output Power THD+N
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WAA2890
V DD = 3V
SpecSymbol Parameter ConditionsMin. Typ. Max.
Units
VIN = 0V, 8 Load 1.9 7 mAIDD Quiescent Power Supply Current
VIN = 0V, No Load 1.7 6 mA
ISD Shutdown Current VIN=0V, VSHD=GND, No Load 0.1 2 uA
VSDIH Shutdown Voltage Input High 1.27 V
VSDIL Shutdown Voltage Input Low 1.08 V
VOS Output Offset Voltage -50 6 50 mV
THD+N Total Harmonic Distortion+Noise Po=0.25Wrms, f=1KHz, 0.06
%
PSRR
Output Power THD+N
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WAA2890Typical Characteristics
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WAA2890
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WAA2890
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WAA2890
ORDERING INFORMATIONDevice Marking Package Shipping
WAA2890FC-9/TR MWW 9Pin W LCSP 3000/Tape and ReelWAA2890DM-8/TR
W A A 2 8 9 0 Y YW W MSOP8 3000/Tape and Reel
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WAA2890Package Information
http://www.willsemi.com Page 9 2/4/2008 Rev2.2
9 Bump WLCSP Dimensions (mm)
REF MIN TYP MAX
A1 0.215 0.235 0.255A2 0.355 0.380 0.405A3 0.020 0.035 0.050D
1.485 1.500 1.515
D1 0.500
E 1.485 1.500 1.515E1 0.500
b 0.300 0.320 0.340
CCC 0.080
MSOP8
All dimension values are in millimeter.
