View MAX4335_47464.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

19-2136; Rev 1; 9/01
SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O Op Amps with Shutdown/Mute
General Description
The MAX4335-MAX4338 op amps deliver 40mW per channel into 32 from ultra-small SC70/SOT23 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. 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. o 50mA Output Drive Capability o Low 0.003% THD (20kHz into 10k) o Rail-to-Rail(R) Inputs and Outputs o 2.7V to 5.5V Single-Supply Operation o 5MHz Gain-Bandwidth Product o 95dB Large-Signal Voltage Gain o 90dB Power-Supply Rejection Ratio o No Phase Reversal for Overdrive Inputs o Ultra-Low Power Shutdown/Mute Mode Reduces Supply Current to 0.04A Places Output in High-Impedance State o Thermal Overload Protection
Features
MAX4335-MAX4338
Ordering Information
PART MAX4335EXT-T MAX4336EXT-T MAX4337EKA-T MAX4337EUA MAX4338EUB TEMP RANGE -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C PINPACKAGE 6 SC70-6 6 SC70-6 8 SOT23-8 8 MAX 10 MAX TOP MARK AAX AAW AAIK -- --
________________________Applications
32 Headphone Drivers Portable/Battery-Powered Instruments Wireless PA Control Hands-Free Car Phones Transformer/Line Drivers DAC/ADC Buffers
Pin Configurations appear at end of data sheet.
Typical Operating Circuit
VCC
TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY
0.005 RL = 10k, VCC = 5V VOUT = 2VP-P
R3 C1 VIN R4
MAX4335 MAX4336
C2
THD + NOISE (%)
32
0.004
0.003
R2 R1 C3
0.002 10 100 1k FREQUENCY (Hz) 10k 100k
Rail-to-Rail is a registered trademark of Nippon Motorola Ltd. ________________________________________________________________ Maxim Integrated Products 1
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.
SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O Op Amps with Shutdown/Mute MAX4335-MAX4338
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, VSHDN = VCC, TA = +25C, unless otherwise noted.)
PARAMETER Operating Supply Voltage Range Quiescent Supply Current (Per Amplifier) Input Offset Voltage Input Bias Current Input Offset Current Differential Input Resistance Input Common-Mode Voltage Range Common-Mode Rejection Ratio Power-Supply Rejection Ratio Output Resistance SYMBOL VCC ICC VOS IB IOS RIN(Diff) VCM CMRR PSRR ROUT CONDITIONS Inferred from PSRR Test VCC = 5.5V VCC = 2.7 VCM = GND to VCC VCM = GND to VCC VCM = GND to VCC |VIN- - VIN+| < 1.2V |VIN- - VIN+| > 1.2V Inferred from CMRR Test VCM = GND to VCC VCC = 2.7V to 5.5V AVCL = 1V/V 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 VCC = 2.7V: RL = 32 VOUT = 0.5V to 2.2V VCC = 2.7V; RL = 10k VCC = 2.7V; RL = 32 VCC = 5V; RL = 10k VCC = 5V; RL = 100 VCC - VOH VOL VCC - VOH VOL VCC - VOH VOL VCC - VOH VOL 70 62 GND 60 70 80 90 0.05 95 84 72 100 100 220 280 100 100 190 240 350 350 400 400 mV dB MIN 2.7 1.3 1.2 0.6 100 7 500 8.4 VCC 3 400 30 TYP MAX 5.5 1.8 UNITS V mA mV nA nA k V dB dB
Output Voltage Swing
VOUT
2
_______________________________________________________________________________________
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, VSHDN = VCC, TA = +25C, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS VCC = 2.7V; ISOURCE, ISINK = 50mA Output Drive IOUT VCC = 5V; ISOURCE, ISINK = 50mA Short-Circuit Current SHDN Logic Levels SHDN Leakage Current Output Leakage Current in Shutdown Shutdown Supply Current (Per Amplifier) ISC VIH VIL IIL IOUT(SHDN) ICC(SHDN) Normal mode Shutdown mode VCC = 5V, GND < VSHDN < VCC VCC = 5V, VSHDN = 0, VOUT = 0, VCC SHDN = GND; VCC = 5V 0.01 <0.04 0.7 x VCC 0.3 x VCC 0.5 0.5 0.5 VCC - VOH VOL 270 360 110 500 500 mA V A A A VCC - VOH VOL MIN TYP 270 360 MAX 500 500 mV UNITS
MAX4335-MAX4338
DC ELECTRICAL CHARACTERISTICS
(VCC = 2.7V, GND = 0, VCM = 0, VOUT = VCC/2, RL = to VCC/2, VSHDN = VCC, TA = -40C to +85C, unless otherwise noted.) (Note 1)
PARAMETER Operating Supply Voltage Range Quiescent Supply Current (Per Amplifier) Input Offset Voltage Input Bias Current Input Offset Current Input Common-Mode Voltage Range Common-Mode Rejection Ratio Power-Supply Rejection Ratio SYMBOL VCC ICC VOS IB IOS VCM CMRR PSRR CONDITIONS Inferred from PSRR test VCC = 5.5V VCM = GND to VCC VCM = GND to VCC VCM = GND to VCC Inferred from CMRR test VCM = GND to VCC VCC = 2.7V to 5.5V VCC = 5V: RL = 100, VOUT = 0.6V to 4.4V VCC = 2.7V: RL = 32, VOUT = 0.6V to 2.1V GND 50 64 66 dB 56 MIN 2.7 TYP MAX 5.5 2.25 6 600 60 VCC UNITS V mA mV nA nA V dB dB
Large-Signal Voltage Gain
AVOL
_______________________________________________________________________________________
3
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, VSHDN = VCC, TA = -40C to +85C, unless otherwise noted.) (Note 1)
PARAMETER SYMBOL CONDITIONS VCC = 2.7V; RL = 32 VCC = 5V; RL = 100 VCC = 2.7V; ISOURCE, ISINK = 50mA Output Drive IOUT VCC = 5V; ISOURCE, ISINK = 50mA SHDN Logic Level SHDN Leakage Current Output Leakage Current in Shutdown Shutdown Supply Current (Per Amplifier) VIH VIL IIL Normal mode Shutdown mode VCC = 5V, GND < VSHDN < VCC VCC - VOH VOL 0.7 x VCC 0.3 x VCC 1 1 1 650 650 V A A A VCC - VOH VOL VCC - VOH VOL VCC - VOH VOL MIN TYP MAX 500 500 400 400 650 650 mV mV UNITS
Output Voltage Swing
VOUT
V = 5V, VSHDN = 0, VOUT = 0; IOUT(SHDN) CC VCC ICC(SHDN) VSHDN = 0; VCC = 5V
AC ELECTRICAL CHARACTERISTICS
(VCC = 2.7V, GND = 0, VCM = VCC/2, VOUT = VCC/2, VSHDN = VCC, AVCL = 1V/V, CL = 15pF, RL = to VCC/2, TA = +25C, unless otherwise noted.)
PARAMETER Gain-Bandwidth Product Full-Power Bandwidth Slew Rate Phase Margin Gain Margin SYMBOL GBWP FBWP SR PM GM VCC = 5V, RL = 100, VOUT = 2VP-P Total Harmonic Distortion THD f = 1kHz f = 10kHz VOUT = 2VP-P, VCC = 5V CONDITIONS MIN TYP 5 280 1.8 70 18 0.005 0.02 0.003 0.01 0.03 % MAX UNITS MHz kHz V/s degrees dB
VCC = 5V, RL = 10k, VOUT = 2VP-P, f = 10kHz VCC = 2.7V; f = 1kHz RL = 32, f = 10kHz VOUT = 2VP-P
4
_______________________________________________________________________________________
SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O Op Amps with Shutdown/Mute
AC ELECTRICAL CHARACTERISTICS (continued)
(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 Settling Time to 0.01% Crosstalk Input Capacitance Input Voltage-Noise Density Input Current-Noise Density Capacitive-Load Stability Shutdown Time Enable Time from Shutdown Power-Up Time tSHDN tENABLE
tON
MAX4335-MAX4338
SYMBOL tS CT CIN en In f = 10kHz f = 1kHz f = 10kHz f = 1kHz 2V step
CONDITIONS VOUT = 2VP-P; f = 1kHz
MIN
TYP 2 100 5 26 0.6 200 1 1 5
MAX
UNITS s dB pF nV/Hz pA/Hz pF s s s
No sustained oscillation
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
MAX4335-8 toc01
MINIMUM OPERATING VOLTAGE vs. TEMPERATURE
MAX4335-8 toc02
SHUTDOWN SUPPLY CURRENT vs. TEMPERATURE
900 800 SUPPLY CURRENT (pA) 700 600 500 400 300 200 100 0 VCC = 2.7V VCC = 5.5V
MAX4335-8 toc03
1.4
2.3 MINIMUM OPERATING VOLTAGE (V) 2.2 2.1 2.0 1.9 1.8 1.7 1.6
1000
SUPPLY CURRENT (mA)
1.3
VCC = 5.5V
1.2 VCC = 2.7V 1.1
1.0 -40 -15 10 35 60 85 TEMPERATURE (C)
1.5 -40 -15 10 35 60 85 TEMPERATURE (C)
-40
-15
10
35
60
85
TEMPERATURE (C)
_______________________________________________________________________________________
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.)
INPUT OFFSET VOLTAGE vs. TEMPERATURE
MAX4335-8 toc04
INPUT BIAS CURRENT vs. COMMON-MODE VOLTAGE
MAX4335 toc05
INPUT BIAS CURRENT vs. TEMPERATURE
150 INPUT BIAS CURRENT (nA) 100 50 0 -50 -100 -150 -200 VCM = 0 VCC = 5.5V -40 -15 10 35 60 85 VCM = VCC VCC = 2.7V VCM = 0 VCC = 2.7V VCM = VCC VCC = 5.5V
MAX4335-8 toc06
1.0 0.8 INPUT OFFSET VOLTAGE (mV) 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1.0 -40 -15 10 35 60 SC70 MAX
100 VCC = 2.7V 50 INPUT BIAS CURRENT (nA) 0 -50 -100 -150 -200 VCC = 5.5V
200
-250 0 1 2 3 4 5 6 COMMON-MODE VOLTAGE (V)
85
TEMPERATURE (C)
TEMPERATURE (C)
COMMON-MODE REJECTION RATIO vs. TEMPERATURE
MAX4335-8 toc07
OUTPUT LOW VOLTAGE vs. TEMPERATURE
MAX4335-8 toc08
OUTPUT HIGH VOLTAGE vs. TEMPERATURE
VCC = 5.5V RL = 100
MAX4335-8 toc09
85
480 440 OUTPUT LOW VOLTAGE (mV) 400 360 320 280 240 200 160 120 80 VCC = 5.5V RL = 100 VCC = 2.7V RL = 100 VCC = 5.5V RL = 100 VCC = 2.7V RL = 100
350 300 OUTPUT HIGH VOLTAGE (mV) 250 200 150 100 50 0 VCC = 5.5V RL = 100 VCC = 2.7V RL = 100
84 CMRR (dB)
VCC = 2.7V RL = 100
83
82
81
80 -40 -15 10 35 60 85 TEMPERATURE (C)
-40
-15
10
35
60
85
-40
-15
10
35
60
85
TEMPERATURE (C)
TEMPERATURE (C)
OUTPUT CURRENT vs. OUTPUT VOLTAGE (SINKING)
MAX4335 toc10
OUTPUT CURRENT vs. OUTPUT VOLTAGE (SOURCING)
MAX4335 toc11
LARGE-SIGNAL GAIN vs. OUTPUT VOLTAGE (SINKING, VCC = 5.5V)
115 LARGE-SIGNAL GAIN (dB) 105 95 RL = 1k 85 75 RL = 100 65 55 RL REFERENCED TO VCC RL = 100k
MAX4335 toc12
250 VCC = 5.5V 200 OUTPUT CURRENT (mA)
250 VCC = 5.5V 200 OUTPUT CURRENT (mA)
150 VCC = 2.7V 100
150
VCC = 2.7V
100
50
50
0 0 0.4 0.8 1.2 1.6 OUTPUT VOLTAGE (V)
0 0 0.2 0.4 0.6 0.8 1.0 1.2 OUTPUT VOLTAGE (V) 1.4 1.6
0
0.1
0.2
0.3
0.4
0.5
OUTPUT VOLTAGE (V)
6
_______________________________________________________________________________________
SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O Op Amps with Shutdown/Mute
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.)
MAX4335-MAX4338
LARGE-SIGNAL GAIN vs. OUTPUT VOLTAGE (SOURCING, VCC = 5.5V)
MAX4335 toc13
LARGE-SIGNAL GAIN vs. OUTPUT VOLTAGE (SINKING, VCC = 2.7V)
MAX4335 toc14
LARGE-SIGNAL GAIN vs. OUTPUT VOLTAGE (SOURCING, VCC = 2.7V)
100 LARGE-SIGNAL GAIN (dB) 90 80 70 RL = 32 60 50 RL REFERENCED TO VCC/2 40 RL = 1k
MAX4335 toc15
120 RL REFERENCED TO VCC/2 110 LARGE-SIGNAL GAIN (dB) 100 90 80 70 RL = 100k 60 50 0.1 0.2 0.3 0.4 OUTPUT VOLTAGE (V) RL = 100 RL = 1k
110 RL = 100k
115 105 LARGE-SIGNAL GAIN (dB) 95 85 75 65 55 45 35
RL REFERENCED TO VCC
RL = 100
RL = 100k RL = 100
RL = 1k
0.5
0.1
0.2
0.3
0.4
0.5
0.05 0.15 0.25 0.35 0.45 0.55 0.65 0.75 OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
LARGE-SIGNAL GAIN vs. TEMPERATURE
MAX4335 toc16
GAIN AND PHASE vs. FREQUENCY
70 60 50 40 GAIN (dB) 30 20 10 0 -10 -20 AVCL = 1000V/V
MAX4335-8 toc17
GAIN AND PHASE vs. FREQUENCY (CL = 200pF)
216 180 144 PHASE (DEGREES) 108 72 36 0 -36 -72 -108 70 60 50 40 GAIN (dB) 30 20 10 0 -10 -20 -30 100 1k 10k 100k 1M FREQUENCY (Hz) AVCL = 1000V/V
MAX4335-8 toc18
110 100 LARGE-SIGNAL GAIN (dB) 90 80 70 60 50 -40 -15 10 35 60 VCC = 2.7V RL = 100k VCC = 5V RL = 100 VCC = 2.7V RL = 32
216 180 144 PHASE (DEGREES) 108 72 36 0 -36 -72 -108
-30 85 100 1k 10k 100k 1M TEMPERATURE (C) FREQUENCY (Hz)
-144 10M
-144 10M
POWER-SUPPLY REJECTION RATIO vs. FREQUENCY
MAX4335-8 toc19
OUTPUT IMPEDANCE vs. FREQUENCY
MAX4335-8 toc20
TOTAL HARMONIC DISTORTION AND NOISE vs. FREQUENCY
0.035 0.030 THD + NOISE (%) 0.025 0.020 0.015 0.010 0.005 VCC = 5V VOUT = 2VP-P 500kHz LOWPASS FILTER RL = 10k to VCC/2
MAX4335/8 toc21
10 0 -10 -20 -30 PSRR (dB) -40 -50 -60 -70 -80 -90 -100 -110 100 1k 10k 100k FREQUENCY (Hz) 1M
100
0.040
OUTPUT IMPEDANCE ()
10
1
0.1
AV = 1
0.01 10M 1k 10k 100k FREQUENCY (Hz) 1M 10M
0 10 100 1k FREQUENCY (Hz) 10k 100k
_______________________________________________________________________________________
7
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.)
TOTAL HARMONIC DISTORTION PLUS NOISE vs. PEAK-TO-PEAK OUTPUT VOLTAGE
CHANNEL-TO-CHANNEL ISOLATION FREQUENCY = 10kHz 1 THD + NOISE (%) RL = 100 RL = 1k 0.1 RL = 100k 0.01
MAX4335 toc22
CHANNEL-TO-CHANNEL ISOLATION vs. FREQUENCY
MAX4335/8 toc23
SMALL-SIGNAL TRANSIENT RESPONSE (NONINVERTING)
MAX4335 toc24
10
-60
-70
IN 20mV/div
-80
-90 -100 OUT 20mV/div
0.001 3.0 3.5 4.0 4.5 5.0 5.5 PEAK-TO-PEAK OUTPUT VOLTAGE (V)
-110 10 100 1k 10k 100k 1M 10M 200ns/div FREQUENCY (Hz)
SMALL-SIGNAL TRANSIENT RESPONSE (INVERTING)
MAX4335 toc25
LARGE-SIGNAL TRANSIENT RESPONSE (NONINVERTING)
MAX4335 toc26
LARGE-SIGNAL TRANSIENT RESPONSE (INVERTING)
VCC = 5V IN 2V/div
MAX4335 toc27
VCC = 5V IN 2V/div
IN 20mV/div
OUT 20mV/div
OUT 2V/div
OUT 2V/div
200ns/div
2s/div
2s/div
8
_______________________________________________________________________________________
SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O Op Amps with Shutdown/Mute
Typical Application Circuit
MAX4335-MAX4338
L INPUT
VREF
MAX4338
MUTE
R INPUT
Pin Description
PIN MAX4337 MAX4335 1 2 3 4 5 -- 6 MAX4336 SOT23 1 2 3 4 -- 5 6 3, 5 4 2, 6 1, 7 -- -- 8 MAX 3, 5 4 2, 6 1, 7 -- -- 8 3, 7 4 2, 8 1, 9 -- 5, 6 10 + + IN1 , IN2 GND IN2 , IN2 OUT1, OUT2 N.C. SHDN1, SHDN2 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 MAX4338 NAME FUNCTION
_______________________________________________________________________________________
9
SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O Op Amps with Shutdown/Mute MAX4335-MAX4338
Applications Information
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: 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 VCC - VDC - = 5.5V - 2.75V - IRMS IDC + IPEAK
Figure 1. A Circuit Example where the MAX4335/MAX4336 is Dissipating High Power
5.5V R C VIN = 2VP-P R
MAX4335 MAX4336
5.5V
32
R CIN VIN = 2VP-P R
MAX4335 MAX4336
CC
(
)
VPEAK 2
CC >
32 1 2 RL fL WHERE fL IS THE LOW-FREQUENCY CUTOFF
2 = 108mARMS
= 2.043VRMS 2 2.75V 1V / 32 = + 32 2
1V
Figure 2. A Circuit Example where Adding a Coupling Capacitor Greatly Reduces the Power Dissipation of Its Package
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. VRMS VCC - VDC - = 5.5V - 2.75V - I IRMS IDC + PEAK 2 = 22mARMS
10
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.
(
)
VPEAK 2 1V 2 = 0A + 1V / 32 2 = 2.043VRMS
______________________________________________________________________________________
SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O Op Amps with Shutdown/Mute
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-MAX4338
MAX4335-MAX4338
R3
R3 = R1
R2
R1
R2
Rail-to-Rail Input Stage
Devices in the MAX4335-MAX4338 family of highoutput-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
Figure 3. Reducing Offset Error Due to Bias Current (Noninverting)
MAX4335-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
______________________________________________________________________________________
SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O Op Amps with Shutdown/Mute MAX4335-MAX4338
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.
Thermal Overload Protection
The MAX4335-MAX4338 includes thermal overload protection circuitry. When the 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 junction temperature falls to below +120C.
Power-Up and Shutdown/Mute Modes
The MAX4336/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).
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 the Typical Operating Characteristics).
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
______________________________________________________________________________________
SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O Op Amps with Shutdown/Mute MAX4335-MAX4338
VOUT VCC
IN (1V/div)
VCC - 1V
IN SOURCE MODE, SHORT-CIRCUIT PROTECTION CIRCUITRY IS NOT ACTIVATED FOR (VCC - VOUT) < 1V. OUTPUT CURRENT CAN SAFELY EXCEED 110mA.
OUT (1V/div)
1V
SHORT-CIRCUIT PROTECTION CIRCUITRY LIMITS OUTPUT CURRENT TO 110mA
IN SINK MODE, SHORT-CIRCUIT PROTECTION CIRCUITRY IS NOT ACTIVATED FOR VOUT < 1V. OUTPUT CURRENT CAN SAFELY EXCEED 110mA. 0
Figure 6. Rail-to-Rail Input/Output Range
Figure 7. Short-Circuit Protection
1300 1200 1100 1000 900 800 700 600 500 400 300 200 100 0 10
MAX4335-fig07
VCC = 5.0V RL to VCC/2
VCC = 3.0V, CL = 330pF RL = 100k, RISO = 0
CAPACITIVE LOAD (pF)
UNSTABLE REGION
IN (20mV/div)
STABLE REGION
OUT (20mV/div)
100
1k
10k
100k
1s/div
RESISTIVE LOAD ()
Figure 8. Capacitive-Load Stability
Figure 9. Small-Signal Transient Response with Excessive Capacitive Load
______________________________________________________________________________________
MAX4335-fig08
13
SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O Op Amps with Shutdown/Mute MAX4335-MAX4338
VCC = 3.0V, CL = 330pF RL = 100k, RISO = 39
IN (20mV/div)
MAX4336
RISO
CL OUT (20mV/div)
1s/div
Figure 10. Small-Signal Transient Response with Excessive Capacitive Load with Isolation Resistor
Figure 11. Capacitive-Load-Driving Circuit
MAX4335-fig11
VCC 1V/div
SHDN 1V/div
OUT 1V/div
OUT 2V/div
5s/div
5s/div
Figure 12. Shutdown Output Voltage Enable/Disable
Figure 13. Power-Up/Down Output Voltage
14
______________________________________________________________________________________
MAX4335-fig12
SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O Op Amps with Shutdown/Mute MAX4335-MAX4338
Pin Configurations
TOP VIEW
IN+ 1 6 VCC OUT1 1 IN1- 2 5 SHDN (N.C.) 8 7 VCC OUT2 IN2IN2+ OUT1 1 IN1IN1+ GND IN
-
10 VCC 9 OUT2 IN2IN2+ SHDN2
2 3 4 5
GND 2
MAX4335 MAX4336
MAX4337
IN1+ 3 GND 4 6 5
MAX4338
8 7 6
3
4
OUT
SHDN1
SC70
( ) MAX4335 ONLY
SOT23/MAX
MAX
___________________Chip Information
MAX4335 TRANSISTOR COUNT: 1200 MAX4336 TRANSISTOR COUNT: 1200 MAX4337 TRANSISTOR COUNT: 2400 MAX4338 TRANSISTOR COUNT: 2400 PROCESS: BiCMOS
______________________________________________________________________________________
15
SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O Op Amps with Shutdown/Mute MAX4335-MAX4338
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.)
4X S
8LUMAXD.EPS
8
8
INCHES DIM A A1 A2 b c D e E H MIN 0.002 0.030 MAX 0.043 0.006 0.037
MILLIMETERS MAX MIN 0.05 0.75 1.10 0.15 0.95
y 0.500.1 0.60.1
E
H
1
0.60.1
1
D
L
S
BOTTOM VIEW
0.014 0.010 0.007 0.005 0.120 0.116 0.0256 BSC 0.120 0.116 0.198 0.188 0.026 0.016 6 0 0.0207 BSC
0.25 0.36 0.13 0.18 2.95 3.05 0.65 BSC 2.95 3.05 4.78 5.03 0.41 0.66 0 6 0.5250 BSC
TOP VIEW
A2
A1
A
e
c b L
SIDE VIEW
FRONT VIEW
PROPRIETARY INFORMATION TITLE:
PACKAGE OUTLINE, 8L uMAX/uSOP
APPROVAL DOCUMENT CONTROL NO. REV.
21-0036
J
1 1
16
______________________________________________________________________________________
SOT23, 8L.EPS
SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O Op Amps with Shutdown/Mute
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.)
e
10
MAX4335-MAX4338
4X S
10
INCHES MAX DIM MIN 0.043 A 0.002 0.006 A1 A2 0.030 0.037 0.116 0.120 D1 D2 0.114 0.118 E1 0.116 0.120 0.118 E2 0.114 0.199 H 0.187 L 0.0157 0.0275 L1 0.037 REF b 0.007 0.0106 e 0.0197 BSC c 0.0035 0.0078 0.0196 REF S 0 6
MILLIMETERS MAX MIN 1.10 0.05 0.15 0.75 0.95 2.95 3.05 3.00 2.89 3.05 2.95 2.89 3.00 4.75 5.05 0.40 0.70 0.940 REF 0.177 0.270 0.500 BSC 0.090 0.200 0.498 REF 0 6
H y 0.500.1 0.60.1
1
1
0.60.1
TOP VIEW
BOTTOM VIEW
D2 GAGE PLANE A2 A b D1 A1
E2 c E1 L1
L
FRONT VIEW
SIDE VIEW
PROPRIETARY INFORMATION TITLE:
PACKAGE OUTLINE, 10L uMAX/uSOP
APPROVAL DOCUMENT CONTROL NO. REV.
21-0061
I
1 1
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.
10LUMAX.EPS

▲Up To Search▲

Price & Availability of MAX4335

	To Download MAX4335 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .