MAX98500 19-5189 Rev 0 5/10 Boosted 2.2W Class D Amplifier with Automatic Level Control General Description Features The MAX98500 is a high-efficiency, Class D audio ampli- S Boosted Class D Output fier that features an integrated boost converter to deliver S Integrated Automatic Level Control a constant output power over a wide range of battery S Output Power supply voltages. 2.2W into 8I, 10% THD+N The boost converter operates at 2MHz, requiring only a 1.7W into 8I, 1% THD+N small (2.2FH) external inductor and capacitor. S Wide 2.5V to 5.5V Supply Voltage Range The automatic level control has a battery tracking func- S Undervoltage Lockout Protection tion that reduces the output swing as the supply voltage S High Total Efficiency of 87% drops, preventing collapse of battery voltage. S High Step-Up Switching Frequency (2MHz) The amplifier has differential inputs and an internal fully differential design. The MAX98500 also features three S Active Emission Limiting for Low EMI gain settings (6dB, 15.5dB, and 20dB) that are select- able with a logic input. The MAX98500 is available in a small, 0.5mm pitch 16-bump WLP package (2.1mm x 2.1mm). It is specified over the extended -40NC to +85NC temperature range. Ordering Information Applications Cell Phones PART TEMP RANGE PIN-PACKAGE Smartphones MAX98500EWE+ -40NC to +85NC 16 WLP +Denotes a lead(Pb)-free/RoHS-compliant package. GPS Devices Mobile Internet Devices Typical Application Circuit appears at end of data sheet. Active Speaker Accessories Simplified Block Diagram BATTERY V LX BAT B4 A3 V CCOUT A2 BOOST CONVERTER SDBST D4 SDSPK C3 CONTROL MAX98500 GAIN B2 A1 PVDD RKNEE B3 B1 SPKP INP D2 DIFFERENTIAL OUTPUT GAIN C1 SPKN INN D3 INPUT STAGE C4 A4 D1, C2 AGND BSTPGND SPKPGND Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.Boosted 2.2W Class D Amplifier with Automatic Level Control ABSOLUTE MAXIMUM RATINGS V to AGND .........................................................-0.3V to +6V Duration of SPK Short Circuit to PVDD or BAT SPKPGND ..............................................................Continuous V to BSTPGND, AGND .................................-0.3V to +6V CCOUT PVDD to SPKPGND .................................................-0.3V to +6V Duration of Short Circuit Between SPKP and SPKN ..............................................................Continuous BSTPGND, SPKPGND to AGND ......................... -0.3V to +0.3V Continuous Power Dissipation, Multilayer Board (T = +70NC) GAIN to AGND ........................................ -0.3V to (V + 0.3V) A BAT WLP (derate 20.4mW/NC above +70NC)........................1.33W SDBST, SDSPK to AGND ...................................... -0.3V to V BAT All Other Pins (excluding LX) to AGND ..................-0.3V to +6V (Note 1).................................................................49NC/W JA Junction Temperature .....................................................+150NC Current Into/Out of LX, V , BSTPGND .....................Q3.9A CCOUT Operating Temperature Range .......................... -40NC to +85NC Continuous Current Into/Out of SPK , PVDD, Storage Temperature Range ............................ -65NC to +150NC SPKPGND ..................................................................Q800mA Soldering Temperature (reflow) ......................................+260NC Continuous Input Current (all other pins) ........................Q20mA Duration of Short Circuit Between V CCOUT and BSTPGND ...................................................... Continuous Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four- layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial. Stresses beyond those listed under Absolute Maximum Ratings 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 operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (V = 3.6V, R = J between SPKP and SPKN, A = +6dB, C = 1FF, 20Hz to 22kHz AC measurement bandwidth, T = T to BAT L V IN A MIN T , unless otherwise noted. Typical values are at T = +25NC.) (Note 2) MAX A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Power-Supply Rejection Ratio PSRR T = +25NC, V = 2.5V to 5.5V 95 dB A BAT (Note 3) 3.05 T = +25NC, SDSPK = SDBST = V A BAT I VBAT 0.09 0.15 T = +25NC, V = 0V, SDBST = V A SDSPK BAT Quiescent Current mA T = +25NC, PVDD = 5.55V, SDSPK = A I 1.7 2.7 PVDD SDBST = V BAT Combined Efficiency E P = 1.7W, f = 1kHz, Z = 8I + 68FH 87 % OUT SPK Shutdown Current I V = V = 0V, T = +25NC 0.04 1.5 FA SHDN SDSPK SDBST A Turn-On Time t Time from power-on to full operation 10 12 ms ON BOOST CONVERTER Battery Supply Voltage Range V 2.5 5.5 V BAT Soft-Start Interval t 5.6 ms ON Undervoltage Lockout UVLO V falling 2.1 2.2 2.3 V BAT Boost Converter Output Voltage V I = 0mA 5.45 5.5 5.65 V VCCOUT LOAD Output Current Limit I V R = 3.6V 1.5 A MAX BAT Input Current Limit I Startup, V = 0V 0.3 0.5 A LIMIT CCOUT nMOS Current Limit I 3.3 A LX,MAX pMOS Turn-Off Current Limit 10 mA Switching Frequency f 1.8 2.0 2.2 MHz S Efficiency E 0.1A P I P 0.75A 93 % OUT Startup Short-Circuit Time Converter latch off 50 ms Thermal Shutdown 165 NC T = +25NC -1.0 +0.1 +1.0 V = 0V or 5.5V, A LX LX Leakage Current FA V = 5.5V CCOUT -40NC P T P +85NC 0.1 A 2 MAX98500