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MOSA
Mono 1.1W Power Amplifier Low Voltage Operation
FEATURES
*Operation range: 2.5V~5.5V *Shutdown Current 0.1uA at 5V *PSRR at 217Hz, 60dB at 5V *Output power, THD+N=1% RL=8 , 1.1W at 5V, 0.4W at 3.3V, 200mW at 2.5V *Unity-gain stable *Space-saving SOP8, MSOP8 and enhance thermal pad
MS6890
Mono 1.1W Power Amplifier with Shutdown
APPLICATIONS
*Portable electronic devices *PDAs *Communication headsets *Cross-reference: LM4890, LM4893, TS4890 TPA751, MAX9716
DESCRIPTION
The MS6890 is a low distortion power amplifier that can drive 1.1W of continuous average power into a mono 8 bridged-tied load (BTL). Operation with 2.5V supply, it can drive 200mw into a mono 8 . The BTL configuration eliminates the need for external coupling capacitors on the output in most applications. The MS6890 is unity-gain stable and can be configured by external gain-setting resistors. The MS6890 has good feature for portable equipment, these features include the low voltage operation, micropower consumption shutdown mode, enhance thermal pad and small package SOP8, MSOP8, make the MS6890 ideally suited for use in portable electronic equipments.
BLOCK DIAGRAM
-IN +IN
4 3
+
A1
-
5
Vo1
BP SHDN VDD GND
2 1 6 7
+ Bias control
A2
+
8
Vo2
REV 1.0
1
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MOSA
PIN CONFIGURATION
Symbol /SHDN BP +IN -IN Vo1 VDD GND Vo2 Pin 1 2 3 4 5 6 7 8
MS6890
Mono 1.1W Power Amplifier with Shutdown
Description /Shutdown places the entire device in shutdown mode when held low. TTL compatible input. Bypass is the cap to the voltage divider for internal mid-supply bias. This terminal should be connected to a 0.1-F to 10-F capacitor CBP. Non-inverting input Inverting input BTL negative output Supply voltage Ground BTL positive output SOP8, MSOP8
SHDN 1 BP 2 +IN 3 -IN 4
Thermal Pad
8 Vo2 7 GND 6 VDD 5 Vo1
ORDERING INFORMATION
Package 8-Pin SOP (lead free) 8-Pin SOP (lead free) 8-Pin MSOP (lead free) 8-Pin MSOP (lead free) RoHS Compliance Part number MS6890GTR MS6890GU MS6890MGTR MS6890MGU Packaging Marking 6890G 6890G 6890G 6890G Transport Media 2.5k Units Tape and Reel 100 Units Tube 3.5k Units Tape and Reel 80 Units Tube
ABSOLUTE MAXIMUM RATINGS
Symbol VDD VESD TSTG TA TJ TS RTHJA Supply voltage Electrostatic handling Storage temperature range Operating ambient temperature range Maximum junction temperature Soldering temperature, 10 seconds Thermal resistance from junction to ambient in free air SOP8 (enhance thermal pad) MSOP8 (enhance thermal pad)
2
Parameter
Rating 6 3500 -65 to 150 -40 to 85 150 260 50 50
Unit V V /W
REV 1.0
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MOSA
OPERATING RATINGS
Symbol VDD Supply voltage Parameter
MS6890
Mono 1.1W Power Amplifier with Shutdown
Min 2.5
Typ 5
Max 5.5
Unit V
5V ELECTRICAL CHARACTERISTICS
Ta = 25C, VDD=5V, f=1kHz, BW<30kHz, unless otherwise specified. Symbol Parameter Conditions IQ ISHDN VSDH VSDL PSRR THD+N S/N Po Quiescent current Shutdown current Shutdown input voltage high Shutdown input voltage low Power supply rejection ratio Total harmonic distortion plus noise Signal-to-noise ratio Output power RL=8, CBP=1uF, f=217Hz RL=8, 1.1W RL=8, 1.1W RL=8, THD+N = 1% VIN=0V, IO=0A VSHDN=0V Min 2.0 90 Typ 2.7 0.1 60 -54 0.2 103 1.1 Max 0.8 -50 0.316 Unit mA uA V V dB dB % dB W
3.3V ELECTRICAL CHARACTERISTICS
Ta = 25C, VDD=3.3V, f=1kHz, BW<30kHz, unless otherwise specified. Symbol Parameter Conditions IQ ISD PSRR THD+N S/N Po Quiescent current Shutdown current Power supply rejection ratio Total harmonic distortion plus noise Signal-to-noise ratio Output power VIN=0V, IO=0A VSHDN=0V RL=8, CBP=1uF, f=217Hz RL=8, 0.4W RL=8, 0.4W RL=8, THD+N = 1% Min 90 Typ 2.4 0.1 60 -54 0.2 100 0.4 Max -50 0.316 Unit mA uA dB dB % dB W
2.5V ELECTRICAL CHARACTERISTICS
Ta = 25C, VDD=2.5V, f=1kHz, BW<30kHz, unless otherwise specified. Symbol Parameter Conditions IQ ISD PSRR THD+N S/N Po Quiescent current Shutdown current Power supply rejection ratio Total harmonic distortion plus noise Signal-to-noise ratio Output power VIN=0V, IO=0A VSHDN=0V RL=8, CBP =1uF, f=217Hz RL=8, 0.2W RL=8, 0.2W RL=8, THD+N = 1% Min 90 Typ 2.2 0.1 60 -53 0.22 98 0.2 Max -50 0.316 Unit mA uA dB dB % dB W
REV 1.0
3
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MOSA
TYPICAL PERFORMANCE CHARACTERISTICS
Ta = 25C, BW<30kHz, unless otherwise specified.
VDD=5V RL=8 VDD=3.3V RL=8
MS6890
Mono 1.1W Power Amplifier with Shutdown
VDD=2.5V RL=8
THD+N (%)
THD+N (%)
Po=1.1W
Po=0.4W
THD+N (%)
Po=0.2W
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
THD+N vs. frequency
THD+N vs. frequency
THD+N vs. frequency
f=20kHz
f=20kHz
f=20kHz
THD+N (%)
THD+N (%)
f=20Hz
f=20Hz
THD+N (%)
f=1kHz
f=1kHz
f=1kHz
f=20Hz
VDD=5V RL=8
VDD=3.3V RL=8
VDD=2.5V RL=8
OUTPUT POWER (W)
OUTPUT POWER (W)
OUTPUT POWER (W)
THD+N vs. output power
THD+N vs. output power
THD+N vs. output power
CBP=1uF
CBP=1uF
CBP=1uF
PSRR (dB)
PSRR (dB)
VDD=5V RL=8
VDD=3.3V RL=8
PSRR (dB)
VDD=2.5V RL=8
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
PSRR vs. frequency
PSRR vs. frequency
PSRR vs. frequency
REV 1.0
4
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MOSA
VIN=0V No load
MS6890
Mono 1.1W Power Amplifier with Shutdown
QUIESCENT CURRENT (mA)
SUPPLY VOLTAGE (V)
Quiescent current vs. supply voltage
REV 1.0
5
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MOSA
APPLICATION INFORMATION
Basic application example
20k RF
MS6890
Mono 1.1W Power Amplifier with Shutdown
0.39uF
20k RI
4 3
-IN +IN
+
A1
Vo1
5
-
VIN
RL 8 1uF 2 1 VDD 1uF 7 6
BP SHDN VDD GND Bias control +
A2
Vo2
8
+
MCU
Fig.1
A audio amplifier application circuit.
External gain-setting As shown in Fig.1, The amplifier A1 is independent amplifiers with an externally configured gain of AV = - RF/RI. The amplifier A2 is a closed-loop gain of AV = -1 fixed by two internal resistors. The outputs of A1 and A2 are used to drive the mono bridged-tied load (BTL).
High Pass Filter The input capacitor CIN and resister RIN are decided the cut-off frequency of the HPF. The equation is as follows: fcut-off = 1 / (2*RIN *CIN) Thermal pad considerations The thermal pad must be connected to ground. The package with thermal pad of the MS6890 requires special attention on thermal design. The thermal pad on the bottom of the MS6890 should be soldered down to a copper pad on the circuit board. Heat can be conducted away from the thermal pad through the copper plane to ambient. If the copper plane is not on the top surface of the circuit board, 9 vias of 13 mil or smaller in diameter should be used to thermally couple the thermal pad to the bottom plane. For good thermal conduction, the vias must be plated through and solder filled.
REV 1.0
6
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MOSA
EXTERNAL DIMENSIONS
SOP8 (Thermal Pad)
MS6890
Mono 1.1W Power Amplifier with Shutdown
W1 H E W2
Symbol A A1 B C D H E e L W1 W2
Dimension in mm Min Max 1.35 1.75 0.10 0.25 0.33 0.51 0.19 0.25 4.80 5.00 5.80 6.20 3.80 4.00 1.27 BSC 0.40 1.27 2.159 2.413 2.159 2.413
Dimension in inch Min Max 0.0532 0.0688 0.0040 0.0098 0.013 0.020 0.0075 0.0098 0.1890 0.1968 0.2284 0.2440 0.1497 0.1574 0.050 BSC 0.016 0.050 0.085 0.095 0.085 0.095
D
L A A1 e B C
MSOP8 (Thermal Pad)
W1 Symbol H E W2 A A1 A2 B C D H E e L W1 W2 Dimension in mm Dimension in inch Min Max Min Max 0.81 1.12 0.032 0.048 0.05 0.15 0.002 0.006 0.76 0.86 0.030 0.038 0.28 0.38 0.011 0.015 0.13 0.23 0.005 0.009 2.90 3.10 0.114 0.122 4.70 5.10 0.185 0.201 2.90 3.10 0.114 0.122 0.65 0.026 0.40 0.66 0.016 0.026 1.27 1.52 0.050 0.060 1.02 1.27 0.040 0.050
Thermal Pad
D
A
A2 e B L
A1
C
Note : Die pad exposure size is according to lead frame design.
REV 1.0
7
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MOSA
TAPE AND REEL
(Unit : mm)
2.0 0.30 0.05 4.0 0.05
MS6890
Mono 1.1W Power Amplifier with Shutdown
1.5+0.1/-0.0 DIA
1.75 0.3R MAX 5.5 0.05 12.0 0.3
5.4
3.0 3.6 6.9
8.0 1.5 MIN 0.5 Radius Typical
2.0 1.7
SOP8
2.0 0.30 0.05 4.0
0.05
1.5+0.1/-0.0
1.75 0.3R MAX 5.5 0.05 12.0 0.3 3.3
5.2 1.5 MIN 4.2 3.4 1.6 1.2
8.0 0.3 Typical
MSOP8
REV 1.0
8
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MOSA
DEMO BOARD
MS6890
Mono 1.1W Power Amplifier with Shutdown
4
1 3
2
Function description Label 1: Supply Voltage Supply voltage range is 2.5V to 5.5V, the left of jump is positive and the right of jump is negative. Label 2: Signal Input Connected to audio signals. Label 3: Speaker Output Connected to speaker with 8ohm or 4 ohm Label 4: Shutdown Control The system is active mode when the jump is placed left, the shutdown pin of MS6890 is connected to GND. The system enters shutdown mode when the jump is placed right, the shutdown pin of MS6890 is connected to VDD.
REV 1.0
9
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MOSA
Circuit
JP1 1 2 AVDD 0.1u C1 + C2 1u R3 100K
MS6890
Mono 1.1W Power Amplifier with Shutdown
J1 1 2 3 SD U1 1 2 3 4 SD BP +IN -IN MS6890 R6 20K L2 +IN_J 20K + C4 1u R5 Vo2 GND VDD Vo1 8 7 6 5 LS1
SPEAKER
JP3 1 2 -IN
C7
0.39u +
REV 1.0
10
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