MAX4295 19-1746 Rev 3 3/05 Mono, 2W, Switch-Mode (Class D) Audio Power Amplifier General Description Features The MAX4295 mono, switch-mode (Class D) audio +2.7V to +5.5V Single-Supply Operation power amplifier operates from a single +2.7V to +5.5V 2W/Channel Output Power at 5V supply. The MAX4295 has >85% efficiency and is 0.7W/Channel Output Power at 3V capable of delivering 2W continuous power to a 4 load, making it ideal for portable multimedia and gener- 87% Efficiency (R = 4 , P = 2W) L OUT al-purpose high-power audio applications. 0.4% THD+N (R = 4 , f = 125kHz) L OSC The MAX4295 features a total harmonic distortion plus Logic-Programmable PWM Frequency Selection noise (THD+N) of 0.4% (f = 125kHz), low quiescent OSC (125kHz, 250kHz, 500kHz, 1MHz) current of 2.8mA, high efficiency, and clickless power- up and shutdown. The SHDN input disables the device Low-Power Shutdown Mode and limits supply current to <1.5A. Other features Clickless Transitions Into and Out of Shutdown include a 1A current limit, thermal protection, and undervoltage lockout. 1A Current Limit and Thermal Protection The MAX4295 reduces the number of required external Available in Space-Saving Packages components. Internal high-speed power-MOS transis- 16-Pin QSOP or Narrow SO tors allow operation as a bridge-tied load (BTL) amplifi- er. The BTL configuration eliminates the need for isolation capacitors on the output. The frequency-selec- table pulse-width modulator (PWM) allows the user to Ordering Information optimize the size and cost of the output filter. The MAX4295 is offered in a space-saving 16-pin PART TEMP RANGE PIN-PACKAGE QSOP or narrow SO package. MAX4295EEE -40C to +85C 16 QSOP Applications MAX4295ESE -40C to +85C 16 Narrow SO Palmtop/Notebook Boom Boxes Computers AC Amplifiers PDA Audio Battery-Powered Speakers Sound Cards Pin Configuration appears at end of data sheet. Cordless Phones Game Cards Portable Equipment Typical Operating Circuit R F AOUT OUT+ C IN R IN AUDIO IN INPUT OUT- MAX4295 2.7V TO 5.5V V CC PV CC PV 2.7V TO 5.5V CC GND GND PGND VCM PGND ON SHDN OFF FS1 SS FS2 Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.Mono, 2W, Switch-Mode (Class D) Audio Power Amplifier ABSOLUTE MAXIMUM RATINGS V , PV to GND or PGND....................................-0.3V to +6V Continuous Power Dissipation (T = +70C) CC CC A PGND to GND.....................................................................0.3V 16-Pin QSOP (derate 8.30mW/C above +70C)........667mW PV to V .......................................................................0.3V 16-Pin Narrow SO (derate 8.7mW/C above +70C)......696mW CC CC VCM, SS, AOUT, IN to GND.......................-0.3V to (V + 0.3V) Operating Temperature Range ...........................-40C to +85C CC SHDN, FS1, FS2 to GND ..........................................-0.3V to +6V Junction Temperature......................................................+150C OUT to PGND.........................................-0.3V to (PV + 0.3V) Storage Temperature Range .............................-65C to +150C CC Op Amp Output Short-Circuit Lead Temperature (soldering, 10s) .................................+300C Duration (AOUT).........Indefinite Short Circuit to Either Supply H-Bridge Short-Circuit Duration (OUT ) ................Continuous Short Circuit to PGND, PV or between OUT+ and OUT- CC 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 = PV = +5V, SHDN = V , FS1 = GND, FS2 = V (f = 250kHz), input amplifier gain = -1V/V, T = T to T , unless CC CC CC CC OSC A MIN MAX otherwise noted. Typical values are T = +25C.) (Note 1) A PARAMETER CONDITIONS MIN TYP MAX UNITS GENERAL Supply Voltage Range (Note 2) 2.7 5.5 V Quiescent Supply Current Output load not connected 2.8 4 mA Shutdown Supply Current SHDN = GND 1.5 8 A 0.285 0.3 0.315 Voltage at VCM Pin V V V V CC CC CC FS1 = GND, FS2 = GND 105 125 145 FS1 = GND, FS2 = V 210 250 290 CC PWM Frequency kHz FS1 = V , FS2 = GND 420 500 580 CC FS1 = V , FS2 = V 840 1000 1160 CC CC PWM Frequency Change with V = 2.7V to 5.5V 1 3 kHz/V CC V CC V = 0.06 V 10.2 12 13.8 IN CC Duty Cycle V = 0.30 V 49.2 50 50.8 % IN CC V = 0.54 V 86.2 88 89.8 IN CC Duty Cycle Change with V V = 0.3 V , V = 2.7V to 5.5V 0.02 0.15 %/V CC IN CC CC V = 5V 0.25 0.5 Switch On-Resistance CC I = 150mA OUT (each power device) V = 2.7V 0.35 1.0 CC H-Bridge Output Leakage SHDN = GND 0 5 A H-Bridge Current Limit 1A Soft-Start Capacitor Charging V = 0V 0.75 1.35 1.95 A SS Current Undervoltage Lockout 1.8 2.2 2.6 V Thermal Shutdown Trip Point 145 C 2 MAX4295