AD52651A

ESMT Preliminary AD52651A 2.5W/CH Stereo Filter-less Class-D Audio Amplifier with Headphone Driver Features Supply voltage range: 2.5 V to 5.5 V Support single-ended or differential analog input Low static operation current Low shut-down current Short power-on transient time Two volume control modes DC volume control from -38dB to +20dB 4-step volume gain of +6, +12, +18, +24dB Independent power-down control for left or right channel Overload and thermal protection Loudspeaker power within 10% THD+N 1.5W/ch into 8Ω loudspeaker 2.5W/ch into 4Ω loudspeaker Loudspeaker efficiency 89% @ 8Ω, Po,10% THD+N 84% @ 4Ω, Po,10% THD+N Headphone power within 1% THD+N 120mW/ch into 16Ω headphone Description The AD52651A is a stereo, filter-less class-D audio amplifier with headphone driver. Operating with 5.0V loudspeaker driver supply, it can deliver 2.5W/CH output power into 4 Ω loudspeaker within 10% THD+N and 120mW/CH output power into 16Ω headphone within 1% THD+N. The AD52651A has two volume control modes by setting MODE pin. While MODE pin is set logic high, AD52651A is in DC volume control mode with 31-step volume gain from -38 dB to +20dB, adjusted by the DC voltage applied on G0 pin. Otherwise, AD52651A is the 4-step volume gain mode with +6dB, +12dB, +18dB, and +24dB gain, selected by setting G0 and G1 pins. The two volume adjustment modes are designed to fit the different volume control requirements in various applications. Beside stereo class-D amplifier, AD52651 has built-in an inverted stereo class-AB headphone driver. With the independent power-down control for left or right channel, the AD52651 is more convenient to control the left and right channels. The AD52651A packaged as E-TSSOP 24L is a stereo audio amplifier with high efficiency, which leads to longer battery left, less heat sink requirement, smaller board size and lower system cost, and suitable for the notebook computer, and portable multimedia devices. Applications Monitor audio PDA Portable multimedia devices Notebook computer Mobile phone Functional Block Diagram Elite Semiconductor Memory Technology Inc. Publication Date: Sep. 2007 Revision: 0.1 1/20 ESMT Pin Assignments Preliminary AD52651A Pin Description NAME 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 INLINL+ HP_SPK G1 HPL OUTL+ PVDDL PGNDL OUTLAGND MODE SDL# SDR# AVDD N.C. OUTRPGNDR PVDDR OUTR+ HPR G0 VREF INR+ INRTYP I I I I O O P G O G I I I P x O G P O O I O I I G DESCRIPTION Left channel Input (-) Left channel Input (+) 0: SPK mode; 1: HP mode Gain selection Left channel headphone driver Left channel output (+) High current power supply High current ground Left channel output (-) Ground 4-gain/DC Vol. control Shut-down left channel Shut-down right channel Power supply N.C. Right channel output (-) High current ground High current power supply Right channel output (+) Right channel headphone driver Gain selection/DC vol. level Reference voltage Right channel Input (+) Right channel Input (-) Must be soldered to PCB’s ground plane Publication Date: Sep. 2007 Revision: 0.1 2/20 with 300 kΩ pull-low resistor with 300 kΩ pull-low resistor with 300 kΩ pull-low resistor with 300 kΩ pull-high resistor with 300 kΩ pull-low resistor CHARACTERISTIC Thermal Pad Elite Semiconductor Memory Technology Inc. ESMT Available Package Package Type E-TSSOP 24L Device no. AD52651A Preliminary AD52651A θJA (oC/W) 43.8 Exposed Thermal Pad Yes (Note1) Note1: The thermal pad is at the bottom of package. To optimize the performance of thermal dissipation, solder the thermal pad to PCB’s ground plane is suggested. Absolute Maximum Ratings SYMBOL AVDD PVDDL(R) Tstg Ta PARAMETER Power supply for lower power analog cells Power supply for loudspeaker driver Input voltage Storage temperature Ambient operating temperature MIN 2.5 2.5 -0.3 -65 0 MAX 5.5 5.5 AVDD 150 70 UNIT V V V o o C C Recommended Operating Conditions SYMBOL AVDD PVDDL(R) VIH VIL Ta PARAMETER Power supply for lower power analog cells Power supply for Driver Stage High-Level Input Voltage Low-Level Input Voltage Ambient Operating Temperature TYP 2.5~5.0 2.5~5.0 2.0 0.8 0~70 UNIT V V V V o C General Electrical Characteristics SYMBOL IPD_SKP PARAMETER Supply current during power-down mode @ Speaker mode Supply current during power-down mode @ Headphone mode Output offset voltage @ Speaker mode Junction temperature for driver shutdown Temperature hysteresis for recovery from shutdown fsw RSC Switching rate of loudspeakers driver Loudspeaker short-circuit PVDDR(L) = 5 V detect resistance CONDITION AVDD=PVDDR(L)=5.0V; HP_SPK=0V; SDL#=SDR#=0V AVDD=PVDDR(L)=5.0V; HP_SPK=5V; SDL#=SDR#=0V Input ac grounded, VDD=2.5V~5.0V 145 115 300 MIN TYP 20 MAX 50 UNIT μA IPD_HP 1 10 μA Voffset 5 150 120 25 155 125 mV o C C o 450 2.8 600 3.2 kHz Ω Elite Semiconductor Memory Technology Inc. Publication Date: Sep. 2007 Revision: 0.1 3/20