DATA SHEET. Filterless, 2.8W, Mono Class-D Audio Power Amplifier

Transcription

1 GK2305LD Filterless, 2.8W, Mono Class-D Audio Power Amplifier General Description ---The GK2305LD is a 2.8W high efficiency, filterless Class-D audio amplifier in a DFN or MSOP package. A filterless PWM architecture eliminates the output filter, reducing external component count, board area consumption, system cost, and simplifying design. ---The GK2305LD is designed to meet the demands of mobile phones and other portable communication devices. Operating on a single 5V supply, it is capable of driving a 4Ω speaker load at a continuous average output of 2.8W with less than 10% THD+N. Its flexible power supply requirements allow operation from 2.2V to 5.5V. Key Specifications PSRR (f=217hz) 77dB (typ) Efficiency (3.6V & 400mW)8Ω 88% (typ) Efficiency (3.6V & 100mW)8Ω 80% (typ) Efficiency (5V & 1W)8Ω 86% (typ) Quiescent current (3.6V) 2.1 ma (typ) Total shutdown power supply current 0.01 ua (typ) Features Mono Class D Operation Externally configurable gain Micro-power shutdown mode No output filter required for inductive loads Minimum external components "Click and pop" suppression circuitry Available in space-saving DFN and MSOP packages Applications Mobile phones MP3/MP4 USB speakers and Notebook PC Portable electronic devices Operating Ratings Temperature Range 40 T A 85 Supply Voltage 2.2V V DD 5.5V Rev1.3-1-

2 Typical Applications Typical Audio Amplifier Application Circuit Connection Diagrams Rev1.3-2-

3 Absolute Maximum Ratings Supply Voltage 6.0V Storage Temperature -65 ~+150 Voltage at Any Input Pin V DD + 0.3V V GND - 0.3V ESD Susceptibility(Human body model) 3000V ESD Susceptibility(Machine Model) 200V Junction Temperature 150 Electrical Characteristics The following specifications apply for A V =2V/V(R i =150kΩ),RL=15μH+8Ω+15μH. T A = 25. Symbol Parameter Conditions MIN TYP MAX UNIT V DD Operating Voltage T A = 40 ~ V I DD I SD I IH I IL V SDIH V SDIL V OS Quiescent Power Supply Current Shutdown Current Logic High Input Current Logic Low Input Current Shutdown voltage input high Shutdown voltage input low Differential Output Offset Voltage V IN =0V, No Load, V DD =5.0V ma V IN =0V, No Load, V DD =3.6V ma V IN =0V, No Load, V DD =2.4V ma V IN =0V, R L =8Ω, V DD =5.0V 2.5 ma V IN =0V, R L =8Ω, V DD =3.6V 2.0 ma V IN =0V, R L =8Ω, V DD =2.4V 1.7 ma V SHUTDOWN =0V, V DD =2.4V-5.0V µa V DD =5.0V, V I =5.5V µa V DD =5.0V, V I =-0.3V µa V I =0V, A V =2V/V, V DD =2.4V~5.0V 1.4 V 0.4 V 5 25 mv R OSD Output Impedance V SHUTDOWN = 0.4V 100 kω R SD A V Resistance from Shutdown Pin to GND Gain 270KΩ R i 350 kω 300KΩ R i 330KΩ R i V/V f SW Po Switching frequency Output Power V DD =2.4V~5.0V khz R L =15μH + 4Ω + 15μH, THD=10%(max), f=1khz V DD = 5V 2.8 W V DD = 3.6V 1.4 W V DD = 2.5V 600 mw Rev1.3-3-

4 Po Output Power R L =15μH + 4Ω + 15μH, THD = 1% (max), f=1khz V DD = 5V 2.25 W V DD = 3.6V 1.15 W V DD = 2.5V 500 mw Po Output Power R L = 15μH + 8Ω+ 15μH, THD=10% (max), f=1khz V DD = 5V 1.65 W V DD = 3.6V 800 mw V DD = 2.5V 350 mw Po Output Power R L = 15μH + 8Ω+ 15μH, THD = 1% (max), f = 1kHz V DD = 5V 1.45 W V DD = 3.6V mw V DD = 2.5V 300 mw THD+N V DD = 5V, Po=0.1W,f=1KHz 0.03 % Total Harmonic V DD =3.6V, Po=0.1W,f=1KHz 0.02 % Distortion + Noise V DD =2.5V, Po=0.1W,f=1KHz 0.02 % V Ripple = 200mV PP sine, f Ripple =217Hz, V DD =3.6 5V, 77 db PSRR Power Supply Inputs to AC GND, C I =2uF Rejection Ratio V Ripple = 200mV PP sine, f Ripple =1KHz, V DD =3.6, 5V 72 db Inputs to AC GND, C I =2uF SNR Signal to Noise Ratio V DD = 5V, P O = 1W RMS 97 db V DD =3.6V, f=20hz~20khz, ε OUT Inputs to AC GND, C I = 2μF, 30 uv RMS Output Noise No Weighting V DD = 3.6V, Inputs to AC GND 23 uv RMS C I = 2μF, A Weighted CMRR Common Mode V DD =3.6V, V Ripple =1V PP sine, Rejection Ratio f Ripple =217Hz 70 db T WU Wake-up Time V DD =3.6V 15 us T SD Shutdown Time 150 us η Efficiency V DD =3.6V, P O =400mW, R L =8Ω 88 % V DD =5V, P O =1W, R L =8Ω 86 % Rev1.3-4-

5 Terminal Functions Terminal DFN/MSOP Symbol I/O Description 1 /SD I Shutdown terminal (active low logic) 2 AV DD I Analog Supply 3 IN- I Negative Differential Input 4 IN+ I Positive Differential Input 5 AGND I Analog Ground 6 NC -- No internal connection 7 V O- O Negative BTL Output 8 PGND I Power Ground 9 PV DD I Power Supply 10 V O+ O Positive BTL Output Test Set-up for Graphs (1) C I was Shorted for any Common-Mode input voltage measurement. (2) A 33-uH inductor was placed in series with the load resistor to emulate a small speaker for efficiency measurements. (3) The 30-kHz low-pass filter is required. And an RC low pass filter (100Ω, 47 nf) is used on each output. (4) The performance graphs of the data sheet were taken using the Audio Precision AUX-0025 Switching Amplifier measurement Filter in series with the LC filter on the demo board. Rev1.3-5-

6 Typical Performance Characteristics Rev1.3-6-

7 Rev1.3-7-

8 Rev1.3-8-

9 Physical Dimensions <DFN-10>: Symbol Dimensions In Millimeters Dimensions In Inches Min. Max. Min. Max. A 0.700/ / / /0.035 A A REF 0.008REF D E D E k 0.200MIN 0.008MIN b e 0.500TYP 0.020TYP L Order Number GK2305LD Rev1.3-9-

10 Physical Dimensions <DFN-8>: Symbol Dimensions In Millimeters Dimensions In Inches Min. Max. Min. Max. A 0.700/ / / /0.035 A A REF 0.008REF D E D E k 0.200MIN 0.008MIN b e 0.650TYP 0.026TYP L Order Number GK2305LD Rev

11 Physical Dimensions <MSOP-8>: Top View Side View 1 Side View 2 Rev

12 Symbol Dimensions In Millimeters Dimensions In Inches Min. Max. Min. Max. A A A b c D e 0.650(BSC) 0.020(BSC) E E L θ Order Number GK2305MM Rev