19-2136; Rev 0; 8/01 SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O Op Amps with Shutdown/Mute The MAX4335-MAX4338 have 90dB Power-Supply Rejection Ratio (PSRR), eliminating the need for costly pre-regulation in most audio applications. Both the input voltage range and the output voltage swing include both supply rails, maximizing dynamic range. The MAX4335/MAX4336 single amplifiers are available in ultra-small 6-pin SC70 packages. The MAX4337/ MAX4338 dual amplifiers are available in an 8-pin SOT23 and a 10-pin MAX package, respectively. All devices are specified from -40C to +85C. ________________________Applications 32 Head-Phone Drivers Portable/Battery-Powered Instruments Wireless PA Control Hands-Free Car Phones Transformer/Line Drivers DAC/ADC Buffers Features 50mA Output Drive Capability Low 0.003% THD (20kHz into 10k) Rail-to-Rail(R) Inputs and Outputs 2.7V to 5.5V Single-Supply Operation 5MHz Gain-Bandwidth Product 95dB Large-Signal Voltage Gain 90dB Power-Supply Rejection Ratio No Phase Reversal for Overdrive Inputs Ultra-Low Power Shutdown/Mute Mode Reduces Supply Current to 0.04A Places Output in High-Impedance State Thermal Shutdown Protection Ordering Information TEMP.RANGE PINPACKAGE MAX4335EXT-T -40C to +85C 6 SC70-6 AAX MAX4336EXT-T -40C to +85C 6 SC70-6 AAW MAX4337EKA-T -40C to +85C 8 SOT23-8 AAIK MAX4337EUA -40C to +85C 8 MAX -- MAX4338EUB -40C to +85C 10 MAX -- PART TOP MARK Pin Configurations appear at end of data sheet. Typical Operating Circuit VCC TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY 0.005 R3 RL = 10k , VCC = 5V VOUT = 2Vp-p C1 VIN R4 32 THD + NOISE (%) C2 MAX4335 MAX4336 0.004 0.003 R2 R1 C3 0.002 10 Rail-to-Rail is a registered trademark of Nippon Motorola Ltd. 100 1000 10,000 100,000 FREQUENCY (Hz) ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com. 1 MAX4335-MAX4338 General Description The MAX4335-MAX4338 op amps deliver 40mW per channel into 32 from ultra-small SC70/SOT23-8 packages making them ideal for mono/stereo headphone drivers in portable applications. These amplifiers have a 5MHz gain-bandwidth product and are guaranteed to deliver 50mA of output current while operating from a single supply of +2.7V to +5.5V. The MAX4336 and the MAX4338 have a shutdown/mute mode that reduces the supply current to 0.04A per amplifier and places the outputs in a high-impedance state. MAX4335-MAX4338 SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O Op Amps with Shutdown/Mute ABSOLUTE MAXIMUM RATINGS Supply Voltage (VCC to GND) ..................................-0.3V to +6V All Other Pins to GND ....................(GND - 0.3V) to (VCC + 0.3V) Output Short-Circuit Duration to VCC or GND ............Continuous Continuous Power Dissipation (TA = +70C) 6-Pin SC70 (derate 3.1mW/C above +70C) ...............245mW 8-Pin SOT23 (derate 9.1mW/C above +70C).............727mW 8-Pin MAX (derate 4.5mW/C above +70C) ..............362mW 10-Pin MAX (derate 5.6mW/C above +70C) .............444mW Operating Temperature Range ...........................-40C to +85C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C 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. DC ELECTRICAL CHARACTERISTICS (VCC = +2.7V, GND = 0, VCM = 0, VOUT = VCC/2, RL = to VCC/2, VS HDN = VCC, TA = +25C, unless otherwise noted.) PARAMETER Operating Supply Voltage Range SYMBOL VCC CONDITIONS MIN TYP MAX UNITS Inferred from PSRR Test 5.5 V VCC = 5.5V 2.7 1.3 1.8 VCC = 2.7 1.2 Quiescent Supply Current (Per Amplifier) ICC Input Offset Voltage VOS VCM = GND to VCC 0.6 3 IB VCM = GND to VCC 100 400 nA IOS VCM = GND to VCC 7 30 nA |VIN- - VIN+| < 1.2V 500 |VIN- - VIN+| > 1.2V 8.4 Input Bias Current Input Offset Current Differential Input Resistance Input Common-Mode Voltage Range RIN(Diff) VCM Inferred from CMRR Test GND mA mV k VCC V Common-Mode Rejection Ratio CMRR VCM = GND to VCC 60 80 dB Power-Supply Rejection Ratio PSRR VCC = 2.7V to 5.5V 70 90 dB Output Resistance ROUT AVCL = +1V/V 0.05 VCC = 5V: RL = 10k VOUT = 0.4V to 4.6V Large-Signal Voltage Gain AVOL VCC = 5V: RL = 100 VOUT = 0.5V to 4.5V 70 84 VCC = 2.7V: RL = 32 VOUT = 0.5V to 2.2V 62 72 VCC = 2.7V; RL = 10k Output Voltage Swing 2 VOUT 95 VCC = 2.7V; RL = 32 dB VCC - VOH 100 VOL 100 VCC - VOH 220 400 400 VOL 280 VCC = 5V; RL = 10k VCC - VOH 100 VOL 100 VCC = 5V; RL = 100 VCC - VOH 190 350 VOL 240 350 _______________________________________________________________________________________ mV SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O Op Amps with Shutdown/Mute MAX4335-MAX4338 DC ELECTRICAL CHARACTERISTICS (continued) (VCC = +2.7V, GND = 0, VCM = 0, VOUT = VCC/2, RL = to VCC/2, VS HDN = VCC, TA = +25C, unless otherwise noted.) PARAMETER Output Drive SYMBOL IOUT Short-Circuit Current CONDITIONS VCC = 2.7V; ISOURCE, ISINK = 50mA VCC = 5V; ISOURCE, ISINK = 50mA TYP MAX VCC - VOH 270 500 VOL 360 500 VCC - VOH 270 500 VOL 360 500 ISC 110 VIH Normal Mode VIL Shutdown Mode IIL VCC = 5V, GND < VSHDN < VCC Output Leakage Current in Shutdown IOUT(SHDN) VCC = 5V, VSHDN = 0, VOUT = 0, VCC Shutdown Supply Current (Per Amplifier) ICC(SHDN) SHDN = GND; VCC = 5V SHDN Logic Levels SHDN Leakage Current MIN UNITS mV mA 0.7 x VCC 0.3 x VCC V 0.5 A 0.01 0.5 A <0.04 0.5 A DC ELECTRICAL CHARACTERISTICS (VCC = +2.7V, GND = 0, VCM = 0, VOUT = VCC/2, RL = to VCC/2, VS HDN = VCC, TA = -40C to +85C, unless otherwise noted.) (Note 1) PARAMETER SYMBOL Operating Supply Voltage Range VCC Inferred from PSRR test Quiescent Supply Current (Per Amplifier) ICC VCC = 5.5V Input Offset Voltage VOS IB Input Offset Current Input Common-Mode Voltage Range Input Bias Current CONDITIONS MIN MAX UNITS 5.5 V 2.25 mA VCM = GND to VCC 6 mV VCM = GND to VCC 600 nA IOS VCM = GND to VCC 60 nA VCM Inferred from CMRR test VCC V 2.7 GND TYP Common-Mode Rejection Ratio CMRR VCM = GND to VCC 50 dB Power-Supply Rejection Ratio PSRR VCC = 2.7V to 5.5V 64 dB VCC = 5V: RL = 100 VOUT = 0.6V to 4.4V 66 VCC = 2.7V: RL = 32 VOUT = 0.6V to 2.1V 56 Large-Signal Voltage Gain AVOL dB _______________________________________________________________________________________ 3 MAX4335-MAX4338 SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O Op Amps with Shutdown/Mute DC ELECTRICAL CHARACTERISTICS (continued) (VCC = +2.7V, GND = 0, VCM = 0, VOUT = VCC/2, RL = to VCC/2, VS HDN = VCC, TA = -40C to +85C, unless otherwise noted.) (Note 1) PARAMETER Output Voltage Swing Output Drive SYMBOL VOUT CONDITIONS SHDN Leakage Current TYP MAX VCC = 2.7V; RL = 32 VCC - VOH 500 VOL 500 VCC = 5V; RL = 100 VCC - VOH 400 VOL 400 VCC = 2.7V; ISOURCE, ISINK = 50mA VCC - VOH 650 VOL 650 VCC - VOH 650 VOL 650 UNITS mV mV IOUT VCC = 5V; ISOURCE, ISINK = 50mA SHDN Logic Level MIN VIH Normal Mode 0.7 x VCC VIL Shutdown Mode IIL 0.3 x VCC V VCC = 5V, GND < VSHDN < VCC 1 A Output Leakage Current in Shutdown V = 5V, VSHDN = 0, VOUT = 0; IOUT(SHDN) CC VCC 1 A Shutdown Supply Current (Per Amplifier) ICC(SHDN) VSHDN = 0; VCC = 5V 1 A AC ELECTRICAL CHARACTERISTICS (VCC = +2.7V, GND = 0, VCM = VCC/2, VOUT = VCC/2, VS HDN = VCC, AVCL = +1V/V, CL = 15pF, RL = to VCC/2, TA = +25C, unless otherwise noted.) PARAMETER SYMBOL Gain-Bandwidth Product GBWP Full-Power Bandwidth FBWP CONDITIONS VOUT = 2Vp-p, VCC = 5V TYP MAX UNITS 5 MHz 280 kHz Slew Rate SR 1.8 V/s Phase Margin PM 70 degrees Gain Margin GM 18 dB VCC = 5V, RL = 100, VOUT = 2Vp-p; Total Harmonic Distortion 4 MIN THD f = 1kHz 0.005 f = 10kHz 0.02 VCC = 5V, RL = 10k, VOUT = 2Vp-p, f = 10kHz VCC = 2.7V; f = 1kHz RL = 32, f = 10kHz VOUT = 2Vp-p 0.003 0.01 0.03 _______________________________________________________________________________________ % SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O Op Amps with Shutdown/Mute (VCC = +2.7V, GND = 0, VCM = VCC/2, VOUT = VCC/2, VS HDN = VCC, AVCL = +1V/V, CL = 15pF, RL = to VCC/2, TA = +25C, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Settling Time to 0.01% tS 2V step 2 s Crosstalk CT VOUT = 2Vp-p; f = 1kHz 100 dB Input Capacitance CIN 5 pF f = 10kHz 26 Input Voltage Noise Density en Input Current Noise Density In f = 10kHz 0.6 No sustained oscillation Enable Time from Shutdown pA/Hz f = 1kHz Capacitive Load Stability Shutdown Time nV/Hz f = 1kHz 200 pF tSHDN 1 s tENABLE 1 s tON 5 s Power-Up Time Note 1: All devices are 100% production tested at TA = +25C. All limits over temperature are guaranteed by design. __________________________________________Typical Operating Characteristics (VCC = +2.7V, GND = 0, VCM = 0, VOUT = VCC/2, RL = to VCC/2, VS HDN = VCC, TA = +25C, unless otherwise noted.) SUPPLY CURRENT PER AMPLIFIER vs. TEMPERATURE 1.2 VCC = +2.7V 1.1 2.1 2.0 1.9 1.8 1.7 -15 10 35 TEMPERATURE (C) 60 85 900 800 700 600 VCC = +5.5V 500 400 300 VCC = +2.7V 200 100 1.5 -40 MAX4335-8 toc03 2.2 1.6 1.0 1000 SUPPLY CURRENT (pA) VCC = +5.5V SHUTDOWN SUPPLY CURRENT vs. TEMPERATURE MAX4335-8 toc02 MAX4335-8 toc01 1.3 2.3 MINIMUM OPERATING VOLTAGE (V) SUPPLY CURRENT (mA) 1.4 MINIMUM OPERATING VOLTAGE vs. TEMPERATURE 0 -40 -15 10 35 TEMPERATURE (C) 60 85 -40 -15 10 35 60 85 TEMPERATURE (C) _______________________________________________________________________________________ 5 MAX4335-MAX4338 AC ELECTRICAL CHARACTERISTICS (continued) Typical Operating Characteristics (continued) (VCC = +2.7V, GND = 0, VCM = 0, VOUT = VCC/2, RL = to VCC/2, VS HDN = VCC, TA = +25C, unless otherwise noted.) INPUT BIAS CURRENT vs. COMMON-MODE VOLTAGE 0.4 0.2 0 -0.2 -0.4 SC70 -0.6 VCC = 5.5V 50 0 -50 -100 100 50 VCM = VCC VCC = +2.7V 0 -50 VCM = 0V VCC = +2.7V -100 -150 VCM = 0V VCC = +5.5V -200 -200 -1.0 -15 10 35 60 85 -250 0 1 2 3 4 5 -40 6 10 35 60 TEMPERATURE (C) COMMON-MODE REJECTION RATIO vs. TEMPERATURE OUTPUT LOW VOLTAGE vs. TEMPERATURE OUTPUT HIGH VOLTAGE vs. TEMPERATURE 83 82 81 VCC = +5.5V RL = 100 440 VCC = +2.7V RL = 100 400 360 320 280 240 200 VCC = +2.7V RL = 100 VCC = +5.5V RL = 100 160 350 80 -15 10 35 60 85 VCC = +2.7V RL = 100 250 85 200 150 100 VCC = +5.5V RL = 100 VCC = +2.7V RL = 100 50 120 80 VCC = +5.5V RL = 100 300 UTPUT HIGH VOLTAGE (mV) MAX4335-8 toc07 84 480 MAX4335-8 toc08 COMMON-MODE VOLTAGE (V) 85 -40 -15 TEMPERATURE (C) OUTPUT LOW VOLTAGE (mV) -40 0 -40 -15 10 35 60 85 -40 -15 10 35 60 85 TEMPERATURE (C) OUTPUT CURRENT vs. OUTPUT VOLTAGE (SINKING) OUTPUT CURRENT vs. OUTPUT VOLTAGE (SOURCING) LARGE-SIGNAL GAIN vs. OUTPUT VOLTAGE (SINKING, VCC = 5.5V) 200 150 VCC = 2.7V 100 150 VCC = 2.7V 100 0 0.4 0.8 OUTPUT VOLTAGE (V) 1.2 1.6 95 RL = 1k 85 75 65 0 0 RL = 100k 105 RL = 100 50 50 RL REFERENCED TO VCC 115 LARGE-SIGNAL GAIN (dB) VCC = 5.5V OUTPUT CURRENT (mA) 200 250 MAX4335 toc10 VCC = 5.5V MAX4335 toc12 TEMPERATURE (C) MAX4335 toc11 TEMPERATURE (C) 250 6 VCM = VCC VCC = +5.5V 150 -150 -0.8 CMMR (dB) 200 MAX4335-8 toc06 VCC = 2.7V INPUT BIAS CURRENT (nA) MAX 0.6 100 MAX4335 toc05 MAX4335-8 toc04 INPUT OFFSET VOLTAGE (mV) 0.8 INPUT BIAS CURRENT (nA) 1.0 INPUT BIAS CURRENT vs. TEMPERATURE MAX4335-8 toc09 INPUT OFFSET VOLTAGE vs. TEMPERATURE OUTPUT CURRENT (mA) MAX4335-MAX4338 SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O Op Amps with Shutdown/Mute 55 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 OUTPUT VOLTAGE (VCC -VOH) 1.6 0 0.1 0.2 0.3 OUTPUT VOLTAGE (V) _______________________________________________________________________________________ 0.4 0.5 SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O Op Amps with Shutdown/Mute MAX4335-MAX4338 Typical Operating Characteristics (continued) (VCC = +2.7V, GND = 0, VCM = 0, VOUT = VCC/2, RL = to VCC/2, VS HDN = VCC, TA = +25C, unless otherwise noted.) RL = 1k 90 RL = 100 80 70 RL = 100k 60 95 RL = 100k 85 RL = 100 75 65 RL = 1k 55 0.5 0.1 GAIN (dB) VCC = 5V RL = 100 80 VCC = 2.7V RL = 32 70 60 50 -15 10 35 60 0.3 0.4 0.05 0.15 0.25 0.35 0.45 0.55 0.65 0.75 OUTPUT VOLTAGE (V) GAIN AND PHASE vs. FREQUENCY GAIN AND PHASE vs. FREQUENCY (CL = 200pF) MAX4335-8 toc17 MAX4335-8 toc18 70 180 60 50 144 50 144 40 108 40 108 30 72 30 72 20 36 20 36 10 0 10 0 0 -36 0 -36 -10 -72 -10 -72 -108 AVCL = 1000V/V -20 -108 -20 -30 -144 10k -30 85 0.1 1 10 100 1k AVCL = 1000V/V 0.1 1 10 100 180 -144 10k 1k FREQUENCY (Hz) FREQUENCY (Hz) POWER-SUPPLY REJECTION RATIO vs. FREQUENCY OUTPUT IMPEDANCE vs. FREQUENCY TOTAL HARMONIC DISTORTION AND NOISE vs. FREQUENCY 100 OUTPUT IMPEDANCE (dB) -30 -40 -50 -60 -70 -80 0.040 10 1 AV = +1 0.1 VCC = 5V VOUT = 2Vp-p 500kHz LOWPASS FILTER RL = 10k to VCC/2 0.035 0.030 THD + NOISE (%) MAX4335-8 toc19 -20 216 216 TEMPERATURE (C) 10 0 -10 0.025 0.020 0.015 0.010 -90 -100 -110 0.01 RL = 32 60 0.5 MAX4335-8 toc20 -40 70 OUTPUT VOLTAGE (V) 60 VCC = 2.7V RL = 100k 90 0.2 70 MAX4335 toc16 100 80 RL REFERENCED TO VCC/2 LARGE-SIGNAL GAIN vs. TEMPERATURE 110 RL = 100 40 GAIN (dB) 0.2 0.3 0.4 OUTPUT VOLTAGE (V) RL = 100k RL = 1k 90 50 35 0.1 LARGE-SIGNAL GAIN (dB) 100 45 50 PSSR (dB) 110 MAX4335/8 toc21 100 RL REFERENCED TO VCC 105 LARGE-SIGNAL GAIN (dB) LARGE-SIGNAL GAIN (dB) 110 115 LARGE-SIGNAL GAIN (dB) RL REFERENCED TO VCC/2 MAX4335 toc14 MAX4335 toc13 120 LARGE-SIGNAL GAIN vs. OUTPUT VOLTAGE (SOURCING, VCC = 2.7V) LARGE-SIGNAL GAIN vs. OUTPUT VOLTAGE (SINKING, VCC = 2.7V) MAX4335 toc15 LARGE-SIGNAL GAIN vs. OUTPUT VOLTAGE (SOURCING, VCC = 5.5V) 0.005 0.1 1 10 FREQUENCY (Hz) 1k 10k 0 0.01 1 10 100 FREQUENCY (Hz) 1k 10k 10 100 1000 10,000 100,000 FREQUENCY (Hz) _______________________________________________________________________________________ 7 ____________________________Typical Operating Characteristics (continued) (VCC = +2.7V, GND = 0, VCM = 0, VOUT = VCC/2, RL = to VCC/2, VS HDN = VCC, TA = +25C, unless otherwise noted.) RL = 1k 0.1 RL = 100k 0.01 -70 IN 20mV/div -80 -90 OUT 20mV/div -100 -110 0.001 4.0 4.5 5.0 0.01 5.5 0.1 1 10 100 TIME (200ns/div) 1000 10,000 FREQUENCY (kHz) PEAK-TO-PEAK OUTPUT VOLTAGE (V) LARGE-SIGNAL TRANSIENT RESPONSE (INVERTING) LARGE-SIGNAL TRANSIENT RESPONSE (NONINVERTING) MAX4335 toc25 SMALL-SIGNAL TRANSIENT RESPONSE (INVERTING) VCC = 5V VCC = 5V IN 20mV/div IN 2V/div IN 2V/div OUT 20mV/div OUT 2V/div OUT 2V/div TIME (200ns/div) TIME (2s/div) TIME (2s/div) _______________________________________________________________________________________ MAX4335 toc27 3.5 MAX4335 toc26 3.0 8 MAX4335 toc24 RL = 100 1 -60 MAX4335/8 toc23 MAX4335 toc22 FREQUENCY = 10kHz CHANNEL-TO-CHANNEL ISOLATION 10 SMALL-SIGNAL TRANSIENT RESPONSE (NONINVERTING) CHANNEL-TO-CHANNEL ISOLATION vs. FREQUENCY TOTAL HARMONIC DISTORTION vs. PEAK-TO-PEAK OUTPUT VOLTAGE THD + NOISE (%) MAX4335-MAX4338 SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O Op Amps with Shutdown/Mute SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O Op Amps with Shutdown/Mute L INPUT VREF MAX4338 MUTE R INPUT Pin Description PIN MAX4337 MAX4335 NAME MAX4336 FUNCTION MAX4338 SOT23 8-MAX + + IN1 , IN2 1 1 3, 5 3, 5 3, 7 2 2 4 4 4 3 3 2, 6 2, 6 2, 8 GND IN2 , IN2 4 4 1, 7 1, 7 1, 9 OUT1, OUT2 5 -- -- -- -- N.C. -- 5 -- -- 5, 6 SHDN1, SHDN2 6 6 8 8 10 VCC Noninverting Input Ground Inverting Input Output(s) No Connection. Not internally connected. Drive SHDN low for shutdown. Drive SHDN high or connect to VCC for normal operation. Positive Supply _______________________________________________________________________________________ 9 MAX4335-MAX4338 Typical Application Circuit MAX4335-MAX4338 SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O Op Amps with Shutdown/Mute Applications Information 5.5V Package Power Dissipation Warning: Due to the high output current drive, this op amp can exceed the absolute maximum power-dissipation rating. As a general rule, as long as the peak current is less than or equal to 50mA, the maximum package power dissipation will not be exceeded for any of the package types offered. There are some exceptions to this rule, however. The absolute maximum power-dissipation rating of each package should always be verified using the following equations. The following equation gives an approximation of the package power dissipation: R C VIN = 2Vp-p R MAX4335 MAX4336 32 PIC(DISS) VRMS IRMS COS where: VRMS = the RMS voltage from VCC to VOUT when sourcing current = the RMS voltage from V OUT to V EE when sinking current IRMS = the RMS current flowing out of or into the op amp and the load = the phase difference between the voltage and the current. For resistive loads, COS = 1. For example, the circuit in Figure 1 has a package power dissipation of 220mW. VRMS (V - VDC ) - CC IRMS I DC + 2 = CC R 2.75V 32 CC > 1V = 2.043VRMS 2 1V / 32 + 2 - V DC )- V PEAK 2 = 5.5 V - 2.75 V - 1V = 2.043 V RMS 2 I RMS I DC + VIN = 2Vp-p MAX4335 MAX4336 32 Therefore, PIC(DISS) = VRMS IRMS COS = 220mW Adding a coupling capacitor improves the package power dissipation because there is no DC current to the load, as shown in Figure 2. ( V CC R CIN 2 = 108mARMS V RMS 5.5V VPEAK = 5.5V - 2.75V - IPEAK Figure 1. A Circuit Example where the MAX4335/MAX4336 is Dissipating High Power I PEAK 2 = 0A + 1V / 32 1 2 RL fL WHERE fL IS THE LOW FREQUENCY CUTOFF Figure 2. A Circuit Example where Adding a Coupling Capacitor Greatly Reduces the Power Dissipation of Its Package Therefore, PIC(DISS) = VRMS IRMS COS = 45mW The absolute maximum power-dissipation rating of the package may be exceeded if the configuration in Figure 1 is used with the MAX4335/MAX4336 amplifiers at a high ambient temperature of 79C (220.6mW/C plus a derating of 3.1mW/C x 9C = 247.9mW). Note that the 247.9mW just exceeds the absolute maximum power dissipation of 245mW for the 6-pin SC70 package. 2 = 22 mA RMS 10 ______________________________________________________________________________________ SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O Op Amps with Shutdown/Mute Rail-to-Rail Input Stage Devices in the MAX4335-MAX4338 family of high-output-current amplifiers have rail-to-rail input and output stages designed for low-voltage, single-supply operation. The input stage consists of separate NPN and PNP differential stages that combine to provide an input common-mode range that extends 0.25V beyond the supply rails. The PNP stage is active for input voltages close to the negative rail, and the NPN stage is active for input voltages near the positive rail. The switchover transition region, which occurs near VCC / 2, has been extended to minimize the slight degradation in common-mode rejection ratio caused by mismatch of the input pairs. Since the input stage switches between the NPN and PNP pairs, the input bias current changes polarity as the input voltage passes through the transition region. Match the effective impedance seen by each input to reduce the offset error caused by input bias currents flowing through external source impedances (Figures 3 and 5). High source impedances, together with input capacitance, can create a parasitic pole that produces an underdamped signal response. Reducing the input impedance or placing a small (2pF to 10pF) capacitor across the feedback resistor improves response. The MAX4335-MAX4338's inputs are protected from large differential input voltages by 1k series resistors and back-to-back double diodes across the inputs (Figure 5). For differential voltages less than 1.2V, input resistance is typically 500k. For differential input voltages greater than 1.2V, input resistance is approximately 8.4k. The input bias current is given by the following equation: IBIAS = (VDIFF - 1.2V) / 8.4k MAX4335-MAX4338 Single-Supply Speaker Driver The MAX4335/MAX4336 can be used as a single-supply speaker driver, as shown in the Typical Operating Circuit. Capacitor C1 is used for blocking DC (a 0.1F ceramic capacitor can be used). When choosing resistors R3 and R4, take into consideration the input bias current as well as how much supply current can be tolerated. Choose resistors R1 and R2 according to the amount of gain and current desired. Capacitor C3 ensures unity gain for DC. A 10F electrolytic capacitor is suitable for most applications. The coupling capacitor C2 sets a low-frequency pole and is fairly large in value. For a 32 load, a 100F coupling capacitor gives a low-frequency pole at 50Hz. The low-frequency pole can be set according to the following equation: = 1 / 2 (RLC2) MAX4335 MAX4336 MAX4337 MAX4338 R3 R3 = R1 R2 R1 R2 Figure 3. Reducing Offset Error Due to Bias Current (Noninverting) MAX4335 MAX4336 MAX4337 MAX4338 R3 R3 = R1 R2 R1 R2 Figure 4. Reducing Offset Error Due to Bias Current (Inverting) Rail-to-Rail Output Stage The minimum output is within millivolts of ground for single-supply operation, where the load is referenced to ground (GND). Figure 6 shows the input voltage range and the output voltage swing of a MAX4335 connected as a voltage follower. The maximum output voltage swing is load dependent; however, it is guaranteed to be within 400mV of the positive rail (VCC = 2.7V) even with maximum load (32 to VCC/2). Driving Capacitive Loads The MAX4335-MAX4338 have a high tolerance for capacitive loads. They are stable with capacitive loads up to 200pF. Figure 7 is a graph of the stable operating region for various capacitive loads vs. resistive loads. ______________________________________________________________________________________ 11 MAX4335-MAX4338 SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O Op Amps with Shutdown/Mute 4.2k 4.2k Figure 5. Input Protection Circuit Figures 8 and 9 show the transient response with excessive capacitive loads (330pF), with and without the addition of an isolation resistor in series with the output. Figure 10 shows a typical noninverting capacitive-load-driving circuit in the unity-gain configuration. The resistor improves the circuit's phase margin by isolating the load capacitor from the op amp's output. Power-Up and Shutdown/Mute Modes The MAX4336 and the MAX4338 have a shutdown option. When the shutdown pin (SHDN) is pulled low, supply current drops to 0.04A per amplifier (VCC = +5V), the amplifiers are disabled, and their outputs are placed in a high-impedance state. Pulling SHDN high enables the amplifier. In the dual MAX4338, the two amplifiers shut down independently. Figure 11 shows the MAX4336's output voltage response to a shutdown pulse. The MAX4335-MAX4338 typically settle within 5s after power-up (Figure 12). Power Supplies and Layout The MAX4335-MAX4338 can operate from a single +2.7V to +5.5V supply. Bypass the power supply with a 0.1F ceramic capacitor in parallel with at least 1F. Good layout improves performance by decreasing the amount of stray capacitance at the op amps' inputs and outputs. Decrease stray capacitance by placing external components close to the op amps' input/output pins, minimizing trace and lead lengths. 12 Thermal Over-Load Protection The MAX4335-MAX4338 includes Thermal Over-Load Protection circuitry. When the device junction temperature of the device exceeds 140C, the supply current drops to 120A per amplifier (VCC = +5V) and the outputs are placed in a high-impedance state. The device returns to normal operation when the device junction temperature falls to below 120C. Short-Circuit Current Protection The MAX4335-MAX4338 incorporate a smart short-circuit protection feature. Figure 7 shows the output voltage region where the protection circuitry is active. A fault condition occurs when IOUT > 110mA and VOUT > 1V (sinking current) or when IOUT > 110mA and (VCC VOUT) > 1V (sourcing current). When a fault is detected, the short-circuit protection circuitry is activated and the output current is limited to 110mA protecting the device and the application circuitry. When the smart short circuit is not active, the output current can safely exceed 110mA (see the Output Current vs. Output Voltage Graph in Typical Operating Characteristics). ______________________________________________________________________________________ SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O Op Amps with Shutdown/Mute MAX4335-MAX4338 VOUT VCC IN SOURCE MODE, SHORT-CIRCUIT PROTECTION CIRCUITRY IS NOT ACTIVATED FOR (VCC - VOUT) < 1V. OUTPUT CURRENT CAN SAFELY EXCEED 110mA. VCC - 1V IN (1V/div) SHORT-CIRCUIT PROTECTION CIRCUITRY LIMITS OUTPUT CURRENT TO 110mA OUT (1V/div) 1V IN SINK MODE, SHORT-CIRCUIT PROTECTION CIRCUITRY IS NOT ACTIVATED FOR VOUT < 1V. OUTPUT CURRENT CAN SAFELY EXCEED 110mA. 0V CAPACITIVE LOAD (pF) MAX4335-fig07 1300 1200 1100 1000 900 800 700 600 500 400 300 200 100 0 VCC = +5.0V RL to VCC/2 IN (20mV/div) UNSTABLE REGION OUT (20mV/div) STABLE REGION 10 100 VCC = +3.0V, CL = 330pF RL = 100k, RISO = 0 MAX4335-fig08 Figure 7. Short-Circuit Protection Figure 6. Rail-to-Rail Input/Output Range 1k 10k 100k 1s/div RESISTIVE LOAD (k) Figure 8. Capacitive-Load Stability Figure 9. Small-Signal Transient Response with Excessive Capacitive Load ______________________________________________________________________________________ 13 VCC = +3.0V, CL = 330pF RL = 100k, RISO = 39 IN (20mV/div) RISO CL OUT (20mV/div) TIME (1s/div) Figure 11. Capacitive-Load-Driving Circuit MAX4335-fig12 Figure 10. Small-Signal Transient Response with Excessive Capacitive Load with Isolation Resistor MAX4335-fig11 MAX4335-MAX4338 SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O Op Amps with Shutdown/Mute VCC 1V/div SHDN 1V/div OUT 1V/div OUT 2V/div 5s/div Figure 12. Shutdown Output Voltage Enable/Disable 14 5s/div Figure 13. Power-Up/Down Output Voltage ______________________________________________________________________________________ SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O Op Amps with Shutdown/Mute MAX4335-MAX4338 TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY THD + NOISE (%) 0.005 RL = 10k , VCC = 5V VOUT = 2Vp-p 0.004 0.003 0.002 10 100 1000 10,000 100,000 FREQUENCY (Hz) Figure 14. Power-Up/Down Output Voltage Pin Configurations TOP VIEW + IN 1 GND 2 IN - MAX4335 MAX4336 3 6 VCC 5 SHDN (N.C.) OUT1 1 IN1- 2 4 OUT SC70-6 8 VCC 7 OUT2 MAX4337 IN1+ 3 6 IN2- GND 4 5 IN2+ SOT23-8/MAX-8 10 VCC OUT1 1 IN1- 2 IN1+ 3 GND SHDN1 9 OUT2 8 IN2- 4 7 IN2+ 5 6 SHDN2 MAX4338 MAX-10 ( ) MAX4335 ONLY ___________________Chip Information MAX4335 TRANSISTOR COUNT: 1,200 MAX4336 TRANSISTOR COUNT: 1,200 MAX4337 TRANSISTOR COUNT: 2,400 MAX4338 TRANSISTOR COUNT: 2,400 PROCESS TECHNOLOGY: BiCMOS ______________________________________________________________________________________ 15 MAX4335-MAX4338 SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O Op Amps with Shutdown/Mute SOT23, 8L.EPS 8LUMAXD.EPS Package Information 16 ______________________________________________________________________________________ SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O Op Amps with Shutdown/Mute 10LUMAX.EPS Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 17 (c) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. MAX4335-MAX4338 Package Information (continued)