A W CLASS AB BTL AUDIO POWER AMPLIFIER EXTERNAL GAIN CONFIGURATION CAPABILITY

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1 DESCRIPTION The is a Class-AB audio power amplifier designed for mobile phones and other portable communication devices. It is capable of delivering 1.28 watts of continuous average power to an 8Ω BTL load with less than 1% distortion (THD+N) from a 5VDC power supply. The was designed specifically to provide high quality output power with a minimal amount of external components. It does not require output coupling capacitors or bootstrap capacitors. And with ultra low shutdown current, the is ideally suited for mobile phone and other low voltage applications where minimal power consumption is a primary requirement. FEATURES 2.2V 5.5V operation Improved PSRR at 217 Hz & 1 KHz: 62 db Power output at 5.0V, 8Ω,1.20W (typ.) Power output at 3.0V,, 8Ω, 410 mw (typ.) Ultra low shutdown current: 0.1 ua (typ.) 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 MSOP8 Package APPLICATION With special pop-click eliminating circuit, the provides perfect pop-click characteristic during turn-on and turn-off transitions. The is unity-gain stable and can be configured by external gain-setting resistors. Wireless handsets Portable electronic devices PDAs, Handheld computers TYPICAL APPLICATION The is available in MSOP8 package ORDERING INFORMATION Package Type Part Number MSOP8 MS8 MS8R Note R: Tape & Reel AiT provides all Pb free products Fig1. REV0.9 1

2 PIN DESCRIPTION Top View Pin # Symbol I/O Functions 1 SHD I Shutdown Logical Control, Active Low 2 BP I/O Analog ground for inner OPAs. It s about 1/2 VDD. 3 INP I Positive Input 4 INN I Negative Input 5 VOUT1 O Negative BTL Output 6 VDD I/O Power Supply (2.2V ~5.5V ) 7 GND I/O Ground 8 VOUT2 O Positive BTL Output REV0.9 2

3 ABSOLUTE MAXIMUM RATINGS Supply Voltage, VDD Input Voltage ESD Susceptibility (HBM) Junction Temperature Thermal Resistance ( θja ) Thermal Resistance θjc (MSOP8) Operation Temperature (TA) Storage Temperature Range (TSTG) -0.3V ~ +6.0V -0.3V ~ VDD+0.3V 4000V -40 o C ~ +150 o C 190 o C/W 56 o C/W -40 o C ~ + 85 o C -65 o C ~ +150 o C Stresses above may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the Electrical Characteristics is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. OPERATING CONDITIONS Parameter Symbol Min Typ Max Unit Power Supply Voltage VDD V Operating Temperature Range TA o C REV0.9 3

4 ELECTRICAL CHARACTERISTICS Test Condition: Fig1. unless otherwise noted. DD = 5V Symbol VDD Parameter Conditions Min. Typ. Max. Unit VIN = 0V, 8Ω Load ma IDD Quiescent Power Supply Current VIN = 0V, No Load ma ISD Shutdown Current VIN=0V, VSHD=GND, No Load ua VSDIH Shutdown Voltage Input High 1.58 V VSDIL Shutdown Voltage Input Low 1.36 V VOS Output Offset Voltage mv THD+N Total Harmonic Distortion+Noise POUT =0.5Wrms, f=1khz, 0.04 % POUT PSRR Output Power Power Supply Rejection Ratio THD+N<=1%, f=1khz, 8Ω Load Input terminated with 10Ω, VDDRIPPLE=0.2VP-P, f=217hz Input terminated with 10Ω, VDDRIPPLE=0.2VP-P, f=1khz W db db TWU Wake-up time 100 ms ROUT Resistor Output to GND kω DD = 3V Symbol VDD IDD Parameter Quiescent Power Supply Current Conditions Min. Typ. Max. Unit VIN = 0V, 8Ω Load ma VIN = 0V, No Load ma ISD Shutdown Current VIN=0V, VSHD=GND, No Load ua VSDIH Shutdown Voltage Input High 1.27 V VSDIL Shutdown Voltage Input Low 1.08 V VOS Output Offset Voltage mv THD+N POUT PSRR Total Harmonic Distortion + Noise POUT =0.25Wrms, f=1khz, Output Power Power Supply Rejection Ratio THD+N<=1%, f=1khz, 8Ω Load Input terminated with 10Ω, VDDRIPPLE=0.2VP-P, f=217hz Input terminated with 10Ω, VDDRIPPLE=0.2VP-P, f=1khz 0.05 % 410 mw db db TWU Wake-up time 75 ms ROUT Resistor Output to GND kω REV0.9 4

5 DD = 2.6V VDD Symbol Parameter Conditions Min. Typ. Max. Unit IDD VIN = 0V, 8Ω Load 2.3 ma Quiescent Power Supply Current VIN = 0V, No Load 2.2 ma ISD Shutdown Current VIN=0V, VSHD=GND, No Load 0.1 ua VSDIH Shutdown Voltage Input High 1.20 V VSDIL Shutdown Voltage Input Low 1.01 V VOS Output Offset Voltage mv THD+N Total Harmonic Distortion+Noise POUT=0.15Wrms, f=1khz, 0.06 % POUT Output Power THD+N<=1%, f=1khz, 8Ω Load 300 mw PSRR Power Supply Rejection Ratio Input terminated with 10Ω, VDDRIPPLE=0.2VP-P, f=217hz Input terminated with 10Ω, VDDRIPPLE=0.2VP-P, f=1khz db db TWU Wake-up time 70 ms ROUT Resistor Output to GND kω REV0.9 5

6 TYPICAL PERFORMANCE CHARACTERISTICS 1. THD+N vs. Frequency VDD=5V, RL=8Ω, POUT=500mW 2. THD+N vs. Frequency VDD=3V, RL=8Ω, POUT=250mW 3. THD+N vs. Frequency VDD=2.6V, RL=8Ω, POUT=150mW 4. THD+N vs. Output Power VDD=5V, RL=8Ω, f=1khz 5. THD+N vs. Output Power VDD=3V, RL=8Ω, f=1khz 6. THD+N vs. Output Power VDD=2.6V, RL=8Ω, f=1khz REV0.9 6

7 7. PSRR vs. Frequency VDD=5V, RL=8Ω, Input 10Ω Terminated 8. PSRR vs. Frequency VDD=5V, RL=8Ω, Input Floating 9. PSRR vs. Frequency VDD=3V, RL=8Ω, Input 10Ω Terminated 10. PSRR vs. Frequency VDD=3V, RL=8Ω, Input Floating 11. PSRR vs. Frequency VDD=2.6V, RL=8Ω, Input 10Ω Terminated 12. PSRR vs. Frequency VDD=2.6V, RL=8Ω, Input Floating REV0.9 7

8 13. Noise Floor, 4V, 8Ω 20KHz Bandwidth, Input to GND 14. Power Dissipating vs. Output Power VDD=5V, RL=8Ω 15. Power Dissipating vs. Output Power VDD=3V, RL=8Ω 16. Power Dissipating vs. Output Power VDD=2.6V, RL=8Ω 17. Shutdown Hysteresis Voltage, VDD=5V 18. Shutdown Hysteresis Voltage, VDD=3V REV0.9 8

9 19. Shutdown Hysteresis Voltage, VDD=2.6V 20. Output Power vs. Supply Voltage f=1khz, RL=8Ω 21. Output Power vs. Supply Voltage f=1khz, RL=16Ω 22. Output Power vs. Supply Voltage f=1khz, RL=32Ω REV0.9 9

10 BLOCK DIAGRAM REV0.9 10

11 DETAILED INFORMATION Single-End Input Differential Input Fig. 1 Typical Application Fig. 2 Differential Input application with Input Capacitors REV0.9 11

12 External Components Description Components Functional Description Ri CI Rf CS Cb Inverting input resistance which sets the closed-loop gain in conjunction with Rf. This resistor also forms a high pass filter with Ci at fc = 1/(2πRixCi). Input coupling capacitor which blocks the DC voltage at the amplifiers input terminates. Also creates a high-pass filter with Ri at fc = 1/(2πRixCi). Feedback resistance which sets the closed-loop gain in conjunction with Ri. Supply bypass capacitor which provides power supply filtering. Bypass pin capacitor which provides half-supply filtering. Refer to the section. REV0.9 12

13 PACKAGE INFORMATION Dimension in MSOP8 (Unit: mm) REV0.9 13