LPA4890MSF

Preliminary Datasheet LPA4890 1.2-Walts Mono Filter-free Audio Power Amplifier General Description Features The LPA4890 is an audio power amplifier designed for portable  2.5-5.5V Operation Voltage communication device applications such as mobile phone  63dB PSRR at 217Hz, VDD=5V applications. The LPA4890 is capable of delivering 1.2W of  0.1µA ultra low current shutdown mode continuous average power to an 8Ω load and with less than 1%  Improved pop & click circuitry distortion (THD+N) from a 5.2V power supply, and 350mW to a  Unique Modulation Scheme Reduces EMI Emissions 8Ω load from a 3V power supply.  0.1-µA Shutdown Current The LPA4890 provides high quality audio while requiring few  No output coupling capacitors, snubber networks or external components and minimal power consumption. It bootstrap capacitors required features a low-power shutdown mode, which is achieved by  External gain configuration capability driving the SHUTDOWN pin with logic low.  Shutdown Pin has 0.4V Compatible Thresholds The LPA4890 contains circuitry to prevent from “pop and click”  BTL output can drive capacitive loads noise that would otherwise occur during turn-on and turn-off  RoHS compliant and 100% lead(Pb)-free transitions. For maximum flexibility, the LPA4890 provides an externally controlled gain (with resistors), as well as an externally controlled turn-on and turn-off times (with the bypass Typical Application Circuit R1 20k capacitor). C3 1uF The LPA4890 is available in a MSOP8 package. Audio Input Order Information LPA4890 RIN 20K VDD -IN + +IN CIN 0.39uF Vo1 20KΩ □ □ □ F: Pb-Free Bypass VDD/2 Package Type MS: MSOP-8 Vo2 + Bias CBY 0.2uF R1 VDD 20KΩ 20KΩ + Shutdown GND Applications Figure 1. Single Input PMP,PSP, Game, Data-Bank  Cellular and Smart mobile phone C1 1uF 20KΩ R3 Audio Input Audio Input Marking Information Device Marking Package Shipping LPA4890 LPA MSOP-8 3K/REEL R2 20K C2 0.39uF -IN + R6 20K C4 R5 0.39uF 20K R1 VDD 20KΩ 4890M VDD Vo1 - +IN 20KΩ Bypass CBY 0.2uF VDD/2 + 20KΩ Vo2 + Bias  Shutdown YWX Y: Year code. W: Weeks code. X: Series number code. GND Figure 2. Differential Input LPA4890-04 May.-2014 Email: marketing@lowpowersemi.com www.lowpowersemi.com Page 1 of 10 Preliminary Datasheet LPA4890 Functional Pin Description Package Type Pin Configurations MSOP-8 Pin Description Pin Name Description 1 SHDN The device enters in shutdown mode when a low level is applied on this pin. 2 BYPASS 3 +IN 4 -IN 5 VO1 Negative output of the LPA4890. Connected to the load and to the feedback resistor Rf. 6 VDD Analog VDD input supply. 7 GND Ground connection for circuitry. 8 VO2 Positive output of the LPA4890. LPA4890-04 Bypass capacitor pin which provides the common mode voltage. Positive input of the first amplifier, receives the common mode voltage. Negative input of the first amplifier, receives the audio input signal. Connected to the feedback resistor Rf and to the input resistor Rin. May.-2014 Email: marketing@lowpowersemi.com www.lowpowersemi.com Page 2 of 10 Preliminary Datasheet LPA4890 Absolute Maximum Ratings  Input Voltage to GND --------------------------------------------------------------------------------------------------------------------- -0.3V to 6V  Other pin Voltage to GND -------------------------------------------------------------------------------------------------------------- -0.3 V to 6V  Junction Temperature, TJMAX ---------------------------------------------------------------------------------------------------------------- 150°C  Storage Temperature Rang, Tstg ----------------------------------------------------------------------------------------------- -65°C to 150°C  ESD Susceptibility --------------------------------------------------------------------------------------------------------------------------------- 2kV  Maximum Soldering Temperature (at leads, 10 sec) ----------------------------------------------------------------------- 260°C  Thermal Resistance θJA (MSOP8) ----------------------------------------------------------------------------------------------------- 165°C/W  Package Dissipation PD (MSOP8) ---------------------------------------------------------------------------------------------------------- 0.9W Electrical Characteristics Symbol VOS IQ ISHDN RDS(ON) Po VSHDN THD+N Parameter Conditions Output offset voltage (measured differentially) Quiescent current Shutdown Current Min. Vi=0V,Av=2V/V,VDD=2.5V to 5.5V on-state resistance Output power 5 25 mV VDD=3.6V, no load 1.40 VDD=2.5V, no load 1.06 0.1 400 VDD=3.6V, no load 500 VDD=2.5V, no load 700 VDD=5.2V, RL=8Ω, THD=1%, f=1KHz 1.2 Start up voltage threshold plus noise Supply ripple rejection ratio CMRR Common mode rejection ratio Zt Start-up time from shutdown May.-2014 µA mΩ W 1.4 Shutdown voltage threshold Total harmonic distortion mA 2.0 VDD=5.5V, no load 0.4 VDD=5V,Po=1W,RL=8Ω,f=1KHz 0.123 VDD=3.6V,Po=0.5W,RL=8Ω,f=1KHz 0.130 VDD=2.5V,Po=0.2W,RL=8Ω,f=1KHz 0.163 ac-grounded Ci=2uF LPA4890-04 Unit 2.5 VDD=3.6V,Inputs PSRR Max. VDD=5.5V, no load VSHDN=0.35V, VDD=2.5V to 5.5V Static drain-source Typ. VDD=3.6V, Vic=1Vpp with F=217Hz, V(ripple)=200mV F=217Hz VDD=3.6V Email: marketing@lowpowersemi.com V % -63 dB -62 dB 45 mS www.lowpowersemi.com Page 3 of 10 Preliminary Datasheet LPA4890 Typical Operating Characteristics LPA4890-04 May.-2014 Email: marketing@lowpowersemi.com www.lowpowersemi.com Page 4 of 10 Preliminary Datasheet LPA4890-04 May.-2014 Email: marketing@lowpowersemi.com www.lowpowersemi.com LPA4890 Page 5 of 10 Preliminary Datasheet LPA4890-04 May.-2014 Email: marketing@lowpowersemi.com www.lowpowersemi.com LPA4890 Page 6 of 10 Preliminary Datasheet LPA4890-04 May.-2014 Email: marketing@lowpowersemi.com www.lowpowersemi.com LPA4890 Page 7 of 10 Preliminary Datasheet LPA4890-04 May.-2014 Email: marketing@lowpowersemi.com www.lowpowersemi.com LPA4890 Page 8 of 10 Preliminary Datasheet LPA4890 Layout Considerations As output power increases, interconnect resistance (PCB traces The inductive nature of the transducer load can also result in and wires) between the amplifier, load and power supply create overshoot on one or both edges, clamped by the parasitic a voltage drop. The voltage loss on the traces between the diodes to GND and LPA4890 and the load results is lower output power and point, this is an aggressive waveform that can radiate or conduct decreased efficiency. Higher trace resistance between the to other components in the system and cause interference. It is supply and the LPA4890 has the same effect as a poorly essential to keep the power and output traces short and well regulated supply, increase ripple on the supply line also shielded if possible. Use of ground planes, beads, and reducing the peak output power. The effects of residual trace micro-strip layout techniques are all useful in preventing resistance increases as output current increases due to higher unwanted interference. output power, decreased load impedance or both. To maintain the highest output voltage swing and corresponding peak output power, the PCB traces that connect the output pins to the load and the supply pins to the power supply should be as wide as possible to minimize trace resistance. The use of power and ground planes will give the best THD+N performance. While reducing trace resistance, the use of power planes also creates parasite capacitors that help to filter the VDD in each case. From an EMI stand- As the distance from the LPA4890 and the speaker increase, the amount of EMI radiation will increase since the output wires or traces acting as antenna become more efficient with length. What is acceptable EMI is highly application specific. Ferrite chip inductors placed close to the LPA4890 may be needed to reduce EMI radiation. The value of the ferrite chip is very application specific. power supply line. LPA4890-04 May.-2014 Email: marketing@lowpowersemi.com www.lowpowersemi.com Page 9 of 10 Preliminary Datasheet LPA4890 Packaging Information LPA4890-04 May.-2014 Email: marketing@lowpowersemi.com www.lowpowersemi.com Page 10 of 10