RT9101 2.65W PWM Class-D Power Amplifier General Description Features zz z zz Wide Operating Voltage : 2.5V to 5.5V The RT9101 is a 2.65W, high efficiency Class-D audio zz z zz High Efficiency With an 8 Speaker : amplifier featuring low-resistance internal power MOSFETs 88% at 400mW and the gain can be set by an external input resistance. 80% at 100mW The filter free topology eliminates the output filter and zz z zz Low Quiescent Current and Shutdown Current reduces the external component count, footprint area, and zz z zz Optimized PWM Output Stage Eliminates LC Filter system costs. zz z zz Fully Differential Design Reduces RF Rectification Operating from a single 5V supply, the RT9101 is capable and Eliminates Bypass Capacitor of driving 4 speaker load at a continuous average output zz z zz Internally Generated 250kHz Switching Frequency of 2.65W/10% THD+N or 2W/0.5% THD+N. The RT9101 zz z zz Integrated Pop and Click Suppression Circuitry has a higher efficiency with speaker load compared to a zz z zz RoHS Compliant and Halogen Free typical class AB amplifier. With a 3.6V supply driving an 8 speaker, the efficiency for a 400mW power level is Applications 88%. z Mobile Phones It is very suitable for power sensitive application, such as z Handsets cellular handsets and battery powered devices. In addition z PDAs to these features, the RT9101 provides a fast startup time z Portable multimedia devices to minimize audible popping during device turn-on and turn- off. Moreover, the RT9101 also integrates thermal and over Pin Configurations current protection circuits. (TOP VIEW) The RT9101 is available in WDFN-8L 3x3, and WL-CSP-9B 1.45x1.45 (BSC) packages. 1 8 SHDN OUTN 2 7 NC GND 3 6 INP VDD Ordering Information INN 4 9 5 OUTP () RT9101 WDFN-8L 3x3 Package Type QW : WDFN-8L 3x3 (W-Type) WSC : WL-CSP-9B 1.45x1.45 (BSC) Lead Plating System G : Green (Halogen Free and Pb Free) INP A1 A2 A3 OUTN Z : ECO (Ecological Element with B1 B2 B3 VDD GND Halogen Free and Pb free) VDD C1 C2 C3 INN OUTP Default : WDFN-8L 3x3 C : WL-CSP-9B 1.45x1.45 (BSC) Note : Richtek products are : WL-CSP-9B 1.45x1.45 (BSC) RoHS compliant and compatible with the current require- ments of IPC/JEDEC J-STD-020. Suitable for use in SnPb or Pb-free soldering processes. www.richtek.com DS9101-01 April 2011 1 SHDN GND GNDRT9101 Marking Information RT9101GQW RT9101CWSC FL= : Product Code 21 : Product Code YMDNN : Date Code W : Date Code 21W FL=YM DNN RT9101ZQW FL : Product Code YMDNN : Date Code FL YM DNN Typical Application Circuit RT9101 OUTN SHDN C I R I 2.2F 150k R OUTP L INP Audio Input VDD C I R from DAC I C 2.2F S 150k 1F INN GND Figure 1. Application Circuit with Differential Input RT9101 OUTN SHDN C I R I 2.2F 150k R L OUTP Audio Input INP VDD C I R I C 2.2F S 150k 1F INN GND Figure 2. Application Circuit with Single-Ended Input www.richtek.com DS9101-01 April 2011 2