EVALUATION KIT AVAILABLE MAX98356 PDM Input Class D Audio Power Amplifier General Description Features The MAX98356 is a digital pulse-density modulated S Single-Supply Operation (2.5V to 5.5V) (PDM) input Class D power amplifier that provides Class S 3.2W Output Power into 4I at 5V AB audio performance with Class D efficiency. This IC offers five selectable gain settings (3dB, 6dB, 9dB, 12dB, S 1.8mA Quiescent Current and 15dB) set by a single gain-select input (GAIN). S 92% Efficiency (R = 8I, P = 900mW, L OUT The MAX98356 takes a stereo pulse density modulated V = 3.7V) DD (SPDM) input signal directly into the DAC. Data on the rising edge of PDM CLK is considered left-channel data S 29V Output Noise (A = 6dB) RMS V while data on the falling PDM CLK edge is right channel. S Low 0.013% THD+N at 1kHz The IC can be configured to produce a left channel, right channel, or left/2 + right/2 output from the stereo input S Exceptionally High Jitter Tolerance data. The IC also features an extremely robust digital S Supported PDM CLK Rates of 1.84MHz4.32MHz audio interface with very high wideband jitter tolerance and 5.28MHz8.64MHz (12ns typ) on PDM CLK. S Supports Left, Right, or Left/2 + Right/2 Outputs Active emissions-limiting, edge-rate limiting, and over- shoot control circuitry greatly reduce EMI. A filterless S Sophisticated Edge Rate Control Enables spread-spectrum modulation scheme eliminates the need Filterless Class D Outputs for output filtering found in traditional Class D devices and reduces the component count of the solution. S 77dB PSRR at 217Hz The IC is available in a 9-pin WLP package (1.345mm x S Low RF Susceptibility Rejects TDMA 1.435mm x 0.64mm) and is specified over the -40NC to Noise from GSM Radios +85NC temperature range. S Extensive Click-and-Pop Reduction Circuitry Applications S Robust Short-Circuit and Thermal Protection Cellular Phones S Available in Space-Saving Package: Tablets 1.345mm x 1.435mm WLP (0.4mm Pitch) Portable Media Players Notebook Computers Simplified Block Diagram Ultrasonic Devices SHUTDOWN Ordering Information and Functional Diagram appears at AND end of data sheet. GAIN MAX98356 CHANNEL CONTROL SELECT CLASS D DIGITAL PDM AUDIO DAC OUTPUT INPUT INTERFACE STAGE For related parts and recommended products to use with this part, refer to: www.maximintegrated.com/MAX98356.related For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maximintegrated.com. 19-6311 Rev 1 7/13MAX98356 PDM Input Class D Audio Power Amplifier ABSOLUTE MAXIMUM RATINGS V , PDM CLK and PDM DATA to GND ..............-0.3V to +6V Continuous Power Dissipation (T = +70NC) DD A WLP (derate 13.7mW/NC above +70NC)....................1096mW All Other Pins to GND .............................. -0.3V to (V + 0.3V) DD Junction Temperature .....................................................+150NC Continuous Current In/Out of V /GND/OUT .................Q1.6A DD Operating Temperature Range .......................... -40NC to +85NC Continuous Input Current (all other pins) ........................Q20mA Storage Temperature Range ............................ -65NC to +150NC Duration of OUT Short Circuit to GND or V ...Continuous DD Soldering Temperature (reflow) ......................................+230NC Duration of OUTP Short to OUTN .............................Continuous Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional opera- tion 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. PACKAGE THERMAL CHARACTERISTICS (Note 1) WLP Junction-to-Ambient Thermal Resistance (q ) ..........73C/W JA Junction-to-Case Thermal Resistance (q ) ...............50C/W JC 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.maximintegrated.com/thermal-tutorial. ELECTRICAL CHARACTERISTICS (V = 5V, V = 0V, GAIN = V (+6dB). PDM CLK = 3.072MHz, speaker loads (Z ) connected between OUTP and OUTN, DD GND DD SPK Z = J, T = T to T , unless otherwise noted. Typical values are at T = +25NC.) (Note 2) SPK A MIN MAX A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage Range V Guaranteed by PSSR test 2.5 5.5 V DD Undervoltage Lockout UVLO 1.4 1.8 2.3 V T = +25NC 2.2 2.7 A Quiescent Current I mA DD T = +25NC, V = 3.7V 1.8 2.2 A DD Shutdown Current I SD MODE = 0V, T = +25NC 0.6 2 FA SHDN A SD MODE = 1.8V, no PDM CLK, T = A Standby Current 300 400 I FA STNDBY +25NC Time from receipt of first clock cycle to Turn-On Time t 0.6 0.7 ms ON full operation Output Offset Voltage V T = +25NC, gain = 15dB Q0.3 Q1.5 mV OS A Peak voltage, T = A Into shutdown -66 +25NC, A-weighted, Click-and-Pop Level K dBV CP 32 samples per Out of shutdown -72 second (Note 3) V = 2.5V to 5.5V, T = +25NC 60 75 DD A f = 217Hz, 77 Power-Supply Rejection Ratio PSRR dB 200mV ripple T = +25NC P-P A (Notes 3, 4) f = 10kHz, 60 200mV ripple P-P Maxim Integrated 2