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Mono 1.1W Power Amplifier with Shutdown Selection R E V 1 1 / 9 www.mosanalog.com Mono 1.1W Power Amplifier Selectable Shutdown Logic Level Low Voltage Operation
FEATURES
‧Operation range: 2.5V ~ 6.5V ‧Shutdown Current 0.1uA at 5V ‧PSRR at 217Hz, 60dB at 5V ‧Output power, THD+N=1% R L=8Ω, 1.1W at 5V, 0.4W at 3.3V, 200mW at 2.5V ‧Unity-gain stable ‧Space-saving MSOP10, enhance thermal pad
APPLICATIONS
‧Portable electronic devices ‧PDAs ‧Communication headsets ‧Cross-reference: LM4901
DESCRIPTION
The MS6901 is a low distortion power amplifier that can drive 1.1W of continuous average power into a mono 8Ω bridged-tied load (BTL). Operation with 2.5V supply, it can drive 200mw into a mono 8Ω. The shutdown may be enabled by either logic high or logic low that depending on shutdown mode selection. The BTL configuration eliminates the need for external coupling capacitors on the output in most applications. The MS6901 is unity-gain stable and can be configured by external gain-setting resistors. The MS6901 has good feature for portable equipment, these features include the low voltage operation, micropower consumption shutdown mode, enhance thermal pad and small package MSOP10, make the MS6901 ideally suited for use in portable electronic equipments. BLOCK DIAGRAM SD Mode -IN BP SD Vo1 +IN Bias control Vo2 VDD GND 7, 9
Mono 1.1W Power Amplifier with Shutdown Selection R E V 1 2 / 9 www.mosanalog.com PIN CONFIGURATION Symbol Pin Description SD 1 Shutdown places the entire device in shutdown mode depending on SD Mode selection. TTL compatible input. SD Mode = 0, the device entries shutdown when SD is logic low. SD Mode = 1, the device entries shutdown when SD is logic high. BP 2 Bypass is the cap to the voltage divider for internal mid-supply bias. This terminal should be connected to a 0.1-μF to 10-μF capacitor C BP. SD Mode 3 The shutdown mode controls the shutdown logic level of the SD pin1. TTL compatible input +IN 4 Non-inverting input -IN 5 Inverting input Vo1 6 BTL negative output GND 7 Ground VDD 8 Supply voltage GND 9 Ground Vo2 10 BTL positive output M S O P 1 0 Vo2 1SD BP SD Mode +IN 5-IN GND VDD GND Vo1 Thermal Pad
ORDERING INFORMATION
Package Part number Packag ing Marking Transport Media 10-Pin MSOP (lead free) MS6901MGTR 6901G 3.5k Units Tape and Reel 10-Pin MSOP (lead free) MS6901MGU 6901G 80 Units Tube RoHS Compliance ABSOLUTE MAXIMUM RATINGS Symbol Parameter Rating Unit VDD Supply voltage 6.5 V VESD Electrostatic handling 3500 V TSTG Storage temperature range -65 to 150 ℃ TA Operating ambient temperature range -40 to 85 ℃ TJ Maximum junction temperature 150 ℃ TS Soldering temperature, 10 seconds 260 ℃ RTHJA Thermal resistance from junction to ambient in free air MSOP10 (enhance thermal pad) 50 ℃/W
Mono 1.1W Power Amplifier with Shutdown Selection R E V 1 3 / 9 www.mosanalog.com OPERATING RATINGS Symbol Parameter Min Typ Max Unit VDD Supply voltage 2.5 5 6.5 V 5V ELECTRICAL CHARACTERISTICS Ta = 25°C, VDD=5V, f=1kHz, BW<30kHz, unless otherwise specified. Symbol Parameter Conditions Min Typ Max Unit IQ Quiescent current VIN=0V, IO=0A - 2.7 - mA ISHDN Shutdown current VSD=0V@VSDM=0V - 0.1 - uA VSDH Shutdown input voltage high 2.0 - - V VSDL Shutdown input voltage low - - 0.8 V VSDMH SD Mode input voltage high 2.0 - - V VSDML SD Mode input voltage low - - 0.8 V PSRR Power supply rejection ratio RL=8Ω, CBP=1uF, f=217Hz - 60 - dB - -54 -50 dB THD+N Total harmonic distortion plus noise R L=8Ω,1.1W - 0.2 0.316 % S/N Signal-to-noise ratio RL=8Ω, 1.1W 90 103 - dB Po Output power RL=8Ω, THD+N = 1% - 1.1 - W 3.3V ELECTRICAL CHARACTERISTICS Ta = 25°C, VDD=3.3V, f=1kHz, BW<30kHz, unless otherwise specified. Symbol Parameter Conditions Min Typ Max Unit IQ Quiescent current VIN=0V, IO=0A - 2.4 - mA ISD Shutdown current VSD=0V@VSDM=0V - 0.1 - uA PSRR Power supply rejection ratio RL=8Ω, CBP=1uF, f=217Hz - 60 - dB - -54 -50 dB THD+N Total harmonic distortion plus noise R S/N Signal-to-noise ratio RL=8Ω, 0.4W 90 100 - dB Po Output power RL=8Ω, THD+N = 1% - 0.4 - W 2.5V ELECTRICAL CHARACTERISTICS Ta = 25°C, VDD=2.5V, f=1kHz, BW<30kHz, unless otherwise specified. Symbol Parameter Conditions Min Typ Max Unit IQ Quiescent current VIN=0V, IO=0A - 2.2 - mA ISD Shutdown current VSD=0V@VSDM=0V - 0.1 - uA PSRR Power supply rejection ratio RL=8Ω, CBP =1uF, f=217Hz - 60 - dB - -53 -50 dB THD+N Total harmonic distortion plus noise R L=8Ω, 0.2W - 0.22 0.316 % S/N Signal-to-noise ratio RL=8Ω, 0.2W 90 98 - dB Po Output power RL=8Ω, THD+N = 1% - 0.2 - W
Mono 1.1W Power Amplifier with Shutdown Selection R E V 1 4 / 9 www.mosanalog.com TYPICAL PERFORMANCE CHARACTERISTICS Ta = 25°C, BW<30kHz, unless otherwise specified. THD+N (%) FREQUENCY (Hz) THD+N (%) FREQUENCY (Hz) THD+N (%) FREQUENCY (Hz) THD+N vs. frequency THD+N vs. frequency THD+N vs. frequency VDD=3.3V RL=8Ω VDD=5V RL=8Ω VDD=2.5V RL=8Ω Po=0.4WPo=1.1W Po=0.2W THD+N (%) OUTPUT POWER (W) THD+N (%) OUTPUT POWER (W) THD+N (%) OUTPUT POWER (W) THD+N vs. output power THD+N vs. output power THD+N vs. output power f=20kHz f=20kHz f=20kHz f=1kHz f=1kHz f=1kHz f=20Hz f=20Hz f=20Hz VDD=5V RL=8Ω VDD=3.3V RL=8Ω VDD=2.5V RL=8Ω PSRR (dB) FREQUENCY (Hz) PSRR (dB) FREQUENCY (Hz) PSRR (dB) FREQUENCY (Hz) PSRR vs. frequency PSRR vs. frequency PSRR vs. frequency CBP=1uF CBP=1uF CBP=1uF VDD=2.5V RL=8Ω VDD=5V RL=8Ω VDD=3.3V RL=8Ω
Mono 1.1W Power Amplifier with Shutdown Selection R E V 1 5 / 9 www.mosanalog.com QUIESCENT CURRENT (mA) SUPPLY VOLTAGE (V) Quiescent current vs. supply voltage VIN=0V No load
APPLICATION INFORMATION
-IN Vo1 +IN A1 10Vo2 0.39uF 20k VIN RI MCU 1uF 20k RF RL SD Mode BP SD Bias control GND 7, 9 1uF VDDVDD 100k Fig.1 A audio amplifier application circuit. External gain-setting As s hown 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).
Mono 1.1W Power Amplifier with Shutdown Selection R E V 1 6 / 9 www.mosanalog.com Shutdown Control The shutdown may be enabled by either logic high or logic low that depending on shutdown mode selection. Both the SD pin and the SD Mode pin are TTL compatible input. The SD Mode is logic low, the device entries shutdown when SD is logic low. The SD Mode is logic high, the device entries shutdown when SD is logic high. High Pass Filter The i nput capacitor CIN and resister RIN are decided the cut-off frequency of the HPF. The equation is as follows: fcut-off = 1 / (2π*RIN *CIN) Thermal pad considerations The t hermal pad must be connected to ground. The package with thermal pad of the MS6901 requires special attention on thermal design. The thermal pad on the bottom of the MS 6901 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 circu it 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.
Mono 1.1W Power Amplifier with Shutdown Selection R E V 1 7 / 9 www.mosanalog.com EXTERNAL DIMENSIONS MSOP10 (Thermal Pad) A A1 B CL D H E Thermal Pad e θ Dimension in mm Dimension in inches Symbol Min Nom Max Min Nom Max A1 0.05 - 0.15 0.002 - 0.006 e 0.50 BASIC 0.02 BASIC θ 0o - 6o 0o - 6o W1 1.27 - 1.52 0.050 - 0.060 W2 1.02 - 1.27 0.040 - 0.050 TAPE AND REEL (Unit : mm) MSOP10 3.0 3.6 12.0 6.9 8.0 5.5 1.75 5.4 2.0 4.0 1.5+0.1/-0.0 DIA 0.5 Radius Typical1.5 MIN 0.30 0.3R MAX 1.72.0 0.05 0.05 0.05 0.3
Mono 1.1W Power Amplifier with Shutdown Selection R E V 1 8 / 9 www.mosanalog.com Demoboard Function description Label 1: Supply Voltage Supply voltage range is 2.5V to 6.5V, 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 mode selection (SD Mode) The shutdown mode is low logic level shutdown mode when the jump is placed left position (SD), the SD Mode is connected to GND. On the other hand , the chip is high logic level shutdown mode when the jump is placed right position (SD), the SD Mode is connected to VDD. Label 5: Shu tdown pin (SD pin) The shutdown may be enabled by either logic high or logic low that depending on shutdown mode selection. The SD Mode is placed left position (SD), the chip entries shutdown when SD pin is placed left position (L), the SD Mode is connected to GND. On the other hand, the SD Mode is placed right position (SD), the chip entries shutdown when SD pin is placed right position (H), the SD Mode is connected to VDD.
Mono 1.1W Power Amplifier with Shutdown Selection R E V 1 9 / 9 www.mosanalog.com Circuit： 20K R220K + C2 C4 0.39u + C3 AVDD LS1 SPEAKER 0.1u IN SD1 BP2 SDM3 +IN4 -IN5 Vo1 6GND 7VDD 8GND 9Vo2 10 MS6901 SD SD Mode AVDD