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19-2407; Rev 0; 4/02
Dual, Rail-to-Rail, High-Output-Drive Op Amp in UCSP
General Description
The MAX4369 dual, high-output-drive op amp combines single-supply operation with high-output-current drive, Rail-to-Rail (R) outputs in an ultra chip-scale package (UCSPTM). The device is unity-gain stable to 3.5MHz and operates from a single 2.3V to 5.5V supply. The MAX4369 is guaranteed to source and sink up to 87mA with a 5V supply. The MAX4369 is capable of delivering 120mW of continuous average power to a 16 load, or 75mW to a 32 load with 1% total harmonic distortion plus noise (THD + N), making the device ideal for portable audio applications. The MAX4369 is specified over the extended temperature range (-40C to +85C) and is available in a tiny (1.5mm x 1.5mm) 9-bump UCSP. o Tiny UCSP (1.5mm x 1.5mm) o Drives 120mW into 16 o 0.03% THD + N at 1kHz o 2.3V to 5.5V Single-Supply Operation o 1mA Supply Current Per Amplifier o Very High Power-Supply Rejection Ratio (96dB) o Unity-Gain Stable o Rail-to-Rail Output Stage o Thermal Overload and Short-Circuit Protection
Features
MAX4369
Ordering Information
PART TEMP RANGE -40C to +85C BUMPPACKAGE 9 UCSP-9 TOP MARK AAN
Applications
Cellular Phones Headphones Headsets PDAs DC Motor Control General-Purpose Audio
MAX4369EBL-T
Bump Configuration appears at end of data sheet.
Typical Application Circuit/Functional Diagram
VCC RF
R1 CIN LEFT AUDIO INPUT RIN
INACOUT OUTA INA+
VBIAS INB+
MAX4369
OUTB COUT
CIN RIGHT AUDIO INPUT
RIN
INB-
CBIAS
R2
RF
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd. UCSP is a trademark of Maxim Integrated Products, Inc. ________________________________________________________________ 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.
Dual, High-Output-Drive, UCSP, Rail-to-Rail Output Op Amp MAX4369
ABSOLUTE MAXIMUM RATINGS
VCC to GND ..............................................................-0.3V to +6V All Other Pins to GND.................................-0.3V to (VCC + 0.3V) Output Short Circuit to VCC or GND (Note 1).............Continuous Continuous Power Dissipation (TA = +70C) 9-Bump USCP (derate 4.7mW/C above +70C)..........379mW Operating Temperature Range ...........................-40C to +85C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Bump Temperature (soldering) (Note 2) Infrared (15s) ................................................................+220C Vapor Phase (60s) ........................................................+215C
Note 1: Continuous power dissipation must also be observed. Note 2: This device is constructed using a unique set of packaging techniques that impose a limit on the thermal profile that the device can be exposed to during board-level solder attach and rework. This limit permits only the use of the solder profiles recommended in the industry standard specification, JEDEC 020A, paragraph 7.6, Table 3 for IR/VPR and convection reflow. Preheating is required. Hand or wave soldering is not allowed.
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
(VCC = 5V, VCM = 0, VOUT = VCC/2, RL = connected to VCC/2, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 3)
PARAMETER Supply Voltage Range Supply Current Per Amplifier Input Offset Voltage Open-Loop Voltage Gain Input Bias Current Input Offset Current Input Common-Mode Range Differential Input Resistance Power-Supply Rejection Ratio Common-Mode Rejection Ratio Output Source/Sink Current SYMBOL VCC ICC VOS AV IB IOS VCM RIN(DIFF) PSRR CMRR IOUT Inferred from CMRR test VIN+ - VIN- = 10mV 2.3V VCC 5.5V 0 VCM VCC - 1.0V 2.7V VCC 5.5V, 0.6V VOUT VCC - 0.6V 2.3V VCC 2.7V, 0.6V VOUT VCC - 0.6V RL = 10k Output Voltage Swing VOUT 2.7V VCC 5.5V RL = 32 RL = 16 Output Power Total Harmonic Distortion Plus Noise Unity-Gain Bandwidth Gain-Bandwidth Product POUT THD + N BW GBWP THD + N = 1%, f = 1kHz (Note 4) RL = 32 f = 1kHz (Note 5) POUT = 100mW, RL = 16 POUT = 65mW, RL = 32 RL = 16 56 VCC - VOH VOL VCC - VOH VOL VCC - VOH VOL 80 70 87 0 500 96 80 125 115 300 15 330 180 350 310 120 75 0.05 0.03 3.5 3.5 mW % MHz MHz 600 600 mV 0.6V VOUT VCC - 0.6V RL = 10k RL = 32 80 CONDITIONS Inferred from PSRR test MIN 2.3 1 0.35 88 84 0.2 0.01 3 0.3 VCC 1.0 TYP MAX 5.5 2.2 5 UNITS V mA mV dB A A V k dB dB mA
2
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Dual, Rail-to-Rail, High-Output-Drive Op Amp in UCSP
ELECTRICAL CHARACTERISTICS (continued)
(VCC = 5V, VCM = 0, VOUT = VCC/2, RL = connected to VCC/2, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 3)
PARAMETER Full-Power Bandwidth Phase Margin Gain Margin Crosstalk Signal-to-Noise Ratio Slew Rate Settling Time Input Capacitance Input-Voltage Noise Density Input-Current Noise Density Capacitive-Load Stability Short-Circuit Current Thermal Shutdown Threshold Thermal Shutdown Hysteresis Power-Up Time tPU ISC SNR SR tS CIN en in f = 1kHz f = 1kHz AV = -1V/V, no sustained oscillations To VCC To GND Settling to 0.1% VOUT = 1.5VRMS, AV = 1V/V (Note 5) SYMBOL FPBW PM GM CONDITIONS MIN TYP 25 73 27 90 100 1 10 1 40 1.5 200 185 215 165 10 25 MAX UNITS kHz degrees dB dB dB V/s s pF nV/Hz pA/Hz pF mA C C s
MAX4369
Note 3: All specifications are 100% tested at TA = +25C; temperature limits are guaranteed by design. Note 4: Guaranteed by design. Not production tested. Note 5: Measurement bandwidth is 22Hz to 22kHz.
Typical Operating Characteristics
(THD + N measurement bandwidth = 22Hz to 22kHz, TA = +25C, unless otherwise noted.)
POWER-SUPPLY REJECTION RATIO vs. FREQUENCY
MAX4369 toc02
GAIN AND PHASE vs. FREQUENCY
80 60 40 20 0 -20 -40 -60 -80 -100 -120 -140 -160 -180 100 80 60 40 20 0 -20 -40 -60 -80 -100 -120 -140 -160 -180 100
MAX4369 toc01
GAIN AND PHASE vs. FREQUENCY
0 -20 -40 PSRR (dB) -60 -80 VCC = 5V AV = 1000V/V CL = 200pF 1k 10k 100k 1M 10M 100M -100 -120 10
VCC = 5V
GAIN (dB)/PHASE (degrees)
VCC = 5V AV = 1000V/V 1k 10k 100k 1M 10M 100M
GAIN (dB)/PHASE (degees)
100
1k
10k
100k
1M
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
_______________________________________________________________________________________
MAX4369 toc03
3
Dual, Rail-to-Rail, High-Output-Drive Op Amp in UCSP MAX4369
Typical Operating Characteristics (continued)
(THD + N measurement bandwidth = 22Hz to 22kHz, TA = +25C, unless otherwise noted.)
POWER-SUPPLY REJECTION RATIO vs. FREQUENCY
MAX4369 toc04
CROSSTALK vs. FREQUENCY
MAX4369 toc05
CROSSTALK vs. FREQUENCY
VCC = 5V VINB = 1.5VRMS OUTA TO OUTB
MAX4369 toc06
0 -20 -40 PSRR (dB) -60 -80 -100 -120 10
VCC = 3V
-40 -50 CROSSTALK (dB) -60 -70 -80 -90 -100
VCC = 5V VINB = 1.5VRMS OUTB TO OUTA
-40 -50 CROSSTALK (dB) -60 -70 -80 -90 -100
100
1k
10k
100k
1M
10
100
1k FREQUENCY (Hz)
10k
100k
10
100
1k FREQUENCY (Hz)
10k
100k
FREQUENCY (Hz)
SUPPLY CURRENT PER AMPLIFIER vs. TEMPERATURE
MAX4369 toc07
OFFSET VOLTAGE vs. TEMPERATURE
MAX4369 toc08
OUTPUT HIGH VOLTAGE vs. TEMPERATURE
RL = 10k VOH = VCC - VOUT OUTPUT HIGH VOLTAGE (mV) 400 VCC = 5V
MAX4369 toc09
1.50 1.25 SUPPLY CURRENT (mA) VCC = 5V 1.00 0.75 VCC = 3V 0.50 0.25 0 -40 -15 10 35 60
600 500 OFFSET VOLTAGE (V) 400 300 200 100 0 VCC = 5V
500
300 VCC = 3V
200
VCC = 3V
100
0 -40 -15 10 35 60 85 -40 -15 10 35 60 85 TEMPERATURE (C) TEMPERATURE (C)
85
TEMPERATURE (C)
OUTPUT LOW VOLTAGE vs. TEMPERATURE
MAX4369 toc10
MINIMUM OPERATING VOLTAGE vs. TEMPERATURE
MAX4369 toc11
LARGE-SIGNAL GAIN vs. OUTPUT SINK CURRENT
MAX4369 toc12
25
5
140 120 LARGE-SIGNAL GAIN (dB) VCC = 5V 100 80 60 40 20 VCC = 3V
OUTPUT LOW VOLTAGE (mV)
20 VCC = 3V 15 VCC = 5V
4 SUPPLY VOLTAGE (V)
3
10
2
5 RL = 10k 0 -40 -15 10 35 60 85 TEMPERATURE (C)
1
0 -40 -15 10 35 60 85 TEMPERATURE (C)
0 0 25 50 75 100 OUTPUT SINK CURRENT (mA)
4
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Dual, Rail-to-Rail, High-Output-Drive Op Amp in UCSP
Typical Operating Characteristics (continued)
(THD + N measurement bandwidth = 22Hz to 22kHz, TA = +25C, unless otherwise noted.)
LARGE-SIGNAL GAIN vs. OUTPUT SOURCE CURRENT
MAX4369 toc13
MAX4369
TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY
MAX4369 toc14
TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY
VCC = 3V POUT = 10mW 1
MAX4369 toc15
140 120 LARGE-SIGNAL GAIN (dB) 100 80 60 40 20 0 0 25 50 75 VCC = 3V VCC = 5V
10 VCC = 5V POUT = 30mW 1
10
THD + N (%)
THD + N (%)
RL = 16
0.1
RL = 16
0.1
RL = 32
0.01 100 0.01 0.1 1 FREQUENCY (kHz) 10 100 OUTPUT SOURCE CURRENT (mA) 0.01 0.01 0.1 1
RL = 32
10
100
FREQUENCY (kHz)
TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER
MAX4369 toc16
TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER
MAX4369 toc17
TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER
VCC = 5V RL = 32 fIN = 1kHz fIN = 20Hz 1 fIN = 10kHz 0.1
MAX4369 toc18
100 VCC = 5V RL = 16 10 fIN = 20Hz THD + N (%)
100 VCC = 3V RL = 16 10 THD + N (%)
100
10 THD + N (%) 50 60
1 fIN = 10kHz 0.1
fIN = 1kHz
1 fIN = 20Hz 0.1 fIN = 10kHz fIN = 1kHz
0.01 0 20 40 60 80 100 120 140 OUTPUT POWER (mW)
0.01 0 10 20 30 40 OUTPUT POWER (mW)
0.01 0 20 40 60 80 100 OUTPUT POWER (mW)
TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER
MAX4369 toc19
OUTPUT POWER vs. SUPPLY VOLTAGE
MAX4369 toc20
OUTPUT POWER vs. SUPPLY VOLTAGE
fIN = 1kHz RL = 32
MAX4369 toc21
100
VCC = 3V RL = 32
200 180 160 OUTPUT POWER (mW) 140 120 100 80 60 40 20 THD + N = 1% THD + N = 10% fIN = 1kHz RL = 16
140 120 OUTPUT POWER (mW) 100
fIN = 1kHz fIN = 20Hz
10 THD + N (%)
THD + N = 10% 80 60 40 THD + N = 1% 20 0
1 fIN = 10kHz 0.1
0.01 0 10 20 30 40 OUTPUT POWER (mW)
0 2.3 3.1 3.9 4.7 5.5 SUPPLY VOLTAGE (V)
2.3
3.1
3.9
4.7
5.5
SUPPLY VOLTAGE (V)
_______________________________________________________________________________________
5
Dual, Rail-to-Rail, High-Output-Drive Op Amp in UCSP MAX4369
Typical Operating Characteristics (continued)
(THD + N measurement bandwidth = 22Hz to 22kHz, TA = +25C, unless otherwise noted.)
SMALL-SIGNAL TRANSIENT RESPONSE (NONINVERTING)
MAX4369 toc22
SMALL-SIGNAL TRANSIENT RESPONSE (INVERTING)
MAX4369 toc23
IN_ 50mV/div IN_ 50mV/div
OUT_ 50mV/div OUT_ 50mV/div
VCC = 5V AV = 1V/V RL = 10k
10s/div
VCC = 5V AV = -1V/V RL = 10k
10s/div
LARGE-SIGNAL TRANSIENT RESPONSE (NONINVERTING)
MAX4369 toc24
LARGE-SIGNAL TRANSIENT RESPONSE (INVERTING)
MAX4369 toc25
IN_
1V/div
IN_
1V/div
OUT_
1V/div
OUT_
1V/div
VCC = 5V AV = 1V/V RL = 10k
10s/div
VCC = 5V AV = -1V/V RL = 10k
10s/div
6
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Dual, Rail-to-Rail, High-Output-Drive Op Amp in UCSP
Bump Description
BUMP A1 A2 A3 B1 B2 B3 C1 C2 C3 NAME INAOUTA INA+ GND -- VCC INBOUTB INB+ FUNCTION Amplifier A Inverting Input Amplifier A Output Amplifier A Noninverting Input Ground Not Populated Power Supply Amplifier B Inverting Input Amplifier B Output Amplifier B Noninverting Input
Applications Information
Power Dissipation
Under normal operating conditions, linear power amplifiers like the MAX4369 can dissipate a significant amount of power. The maximum power dissipation of the UCSP package is given in the Absolute Maximum Ratings section under Continuous Power Dissipation or can be calculated by the following equation: PDISS(MAX) = TJ(MAX) - TA JA
MAX4369
Detailed Description
Rail-to-Rail Output
The MAX4369 can drive a 10k load and still swing within 300mV of the positive-supply rail, and 15mV of the negative-supply rail. Figure 1 shows the output voltage swing of the MAX4369 configured with AV = 2V/V.
where TJ(MAX) is +150C and JA is the reciprocal of the derating factor in C/W as specified in the Absolute Maximum Ratings. For example, JA of a UCSP package is 211C/W. If the power dissipation exceeds the maximum allowed for a given package, either reduce VCC, increase load impedance, decrease the ambient temperature or add heat sinking to the device. Large output, supply, and ground traces improve the maximum power dissipation in the package. Thermal overload protection limits total power dissipation in the MAX4369. When the junction temperature exceeds +165C, the thermal protection circuitry disables the amplifier output stage. The amplifiers are enabled once the junction temperature cools by 10C. This results in a pulsing output under continuous thermal overload conditions.
Driving Capacitive Loads
Driving a capacitive load can cause instability in many op amps. The MAX4369 is unity-gain stable for a range of capacitive loads to 200pF. Figure 2 shows the response of the MAX4369 with an excessive capacitive load. Adding a series resistor between the output and the output capacitor improves the circuit's response by isolating the load capacitance from the op amp's output.
VCC = 5V RL = 10k
5V IN_ 100mV/div
OUT_
OUT_ GND
200mV/div
400s/div AV = 2V/V VCC = 5V CLOAD = 1nF
4s/div
Figure 1. Rail-to-Rail Output Operation
Figure 2. Small-Signal Transient Response with Excessive Capacitive Load 7
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Dual, Rail-to-Rail, High-Output-Drive Op Amp in UCSP MAX4369
VCC CF 50k 100pF C3 INB+ 1F 50k RFB 10k CIN 1F POSITIVE AUDIO INPUT RIN 10k A3 INA+ INB- C1 OUTB C2 RF 10k
MAX4369
OUTA A2
RINB 10k
CIN 1F NEGATIVE AUDIO INPUT
RIN 10k
A1 INA-
RF 10k
CF 10OpF
Figure 3. Differential Input/Differential Output Audio Amplifier
Supply Bypassing
Proper supply bypassing ensures low-noise, low-distortion performance. Place a 0.1F ceramic capacitor in parallel with a 10F capacitor from VCC to GND. Locate the bypass capacitors as close to the device as possible.
Layout Considerations
Good layout improves performance by decreasing the amount of stray capacitance and noise at the amplifier's inputs and outputs. Decrease stray capacitance by minimizing PC board trace lengths, using surfacemount components and placing external components as close to the device as possible.
audio signal from the MAX4369. See the Input Capacitor section for selecting the value of CIN. The output capacitors (COUT) serve to block the DC bias of the MAX4369 from the speaker load. See the Output Capacitor section for selecting the value of COUT. Set the DC bias (typically VCC/2) by the resistive voltage-divider formed by R1 and R2. Ensure that the DC-bias level gives the incoming audio signal the maximum amount of headroom. COUT can be eliminated by operating the MAX4369 from a dual supply (1.15V to 2.5V) and setting the DC bias to 0.
Differential Input/Differential Output Audio Amplifier
The MAX4369 can be used as a differential input/differential output (BTL) amplifier (Figure 3). This configuration offers good CMRR, improved low-frequency PSRR, no large output-coupling capacitors compared to a single-ended amplifier. Resistors RINB and RFB configure the second amplifier as an inverting unity-gain follower. Connect the noninverting input of the second amplifier to a bias voltage, typically VCC/2. Resistors RIN and RF set the differential gain of the device as follows: VOUT(DIFF) VIN(DIFF) = RF RIN
UCSP Considerations
For general UCSP information and PC layout considerations, please refer to the Maxim Application Note: Wafer-Level Ultra-Chip-Scale Package.
Audio Applications
Single-Ended Stereo Amplifier
The high-output-current drive makes the MAX4369 ideal for use as a stereo audio amplifier (see Typical Application Circuit/Functional Diagram). In this configuration, the MAX4369 can deliver 120mW per channel into 16 with less than 1% THD + N. The input capacitors (CIN) block the DC component of the incoming
8
_______________________________________________________________________________________
Dual, Rail-to-Rail, High-Output-Drive Op Amp in UCSP
The capacitors (CF) are necessary to maintain stability. The amplifier has two feedback paths, one from OUTA to INA- and the other from OUTB to INA+. At high frequencies, the second amplifier in the OUTB to INA+ feedback path introduces excessive phase shift. Compensate this phase shift by adding a capacitor from INA+ to GND. This suppresses the gain of the device at high frequencies, maintaining stability. Placing an identical-valued capacitor from INA- to OUTA improves overall performance. Proper matching of the RF and RIN components is essential for optimum performance. A resistor pack offers a cost-effective solution for these matched components.
Headphone Driver
The MAX4369 can drive a stereo headphone when configured as a single-ended stereo amplifier. Typical 3wire headphone plugs consist of a tip, ring, and sleeve. The tip and ring are the signal carriers while the sleeve is the ground connection (Figure 4). Figure 5 shows the MAX4369 configured to drive a set of headphones. OUTB is coupled to the ring and OUTA is coupled to the tip, delivering the signal to the headphone.
MAX4369
Capacitor Selection
Input Capacitor The input capacitor (CIN), in conjunction with RIN, forms a high-pass filter that removes the DC bias from an incoming signal (see the Typical Application Circuit/ Functional Diagram). The AC-coupling capacitor allows the amplifier to bias the signal to an optimum DC level. Assuming zero-source impedance, the -3dB point of the high-pass filter is given by:
f -3dB =
TIP (LEFT)
RING (RIGHT)
SLEEVE (GND)
1 2RINCIN
Choose CIN such that f-3dB is well below the lowest frequency of interest. Setting f-3dB too high affects the low-frequency response of the amplifier. Use capacitors whose dielectrics have low-voltage coefficients,
Figure 4. Typical 3-Wire Headphone Jack
VCC RF
R1 CIN LEFT AUDIO INPUT RIN
INACOUT OUTA INA+ HEADPHONE JACK
VBIAS INB+
MAX4369
COUT OUTB
CIN RIGHT AUDIO INPUT
RIN
INB-
CBIAS
R2
RF
Figure 5. Stereo Headphone Driver _______________________________________________________________________________________ 9
Dual, Rail-to-Rail, High-Output-Drive Op Amp in UCSP
such as tantalum or aluminum electrolytic. Capacitors with high-voltage coefficients, such as certain ceramics, can result in an increase in distortion at low frequencies. Other considerations when designing the input filter include the constraints of the overall system, the actual frequency band of interest and click-and-pop suppression. Although high-fidelity audio calls for a flat gain response between 20Hz and 20kHz, portable voicereproduction devices such as cellular phones and walkie-talkies need only concentrate on the frequency range of the spoken human voice (typically 300Hz to 3.5kHz). In addition, speakers used in portable devices typically have a poor response below 150Hz. Taking these two factors into consideration, the input filter might not need to be designed for a 20Hz to 20kHz response, saving both board space and cost due to the use of smaller capacitors. Output-Coupling Capacitor The MAX4369 requires an output-coupling capacitor when configured as a single-ended amplifier. The output capacitor blocks the DC component of the amplifier output, preventing DC current flowing to the load. The output capacitor and the load impedance form a highpass filter with the -3dB point determined by:
f -3dB =
MAX4369
Bump Configuration
TOP VIEW (BUMP SIDE DOWN) 1 A INAB GND C INBOUTB INB+ OUTA INA+ 2 3
MAX4369
VCC
UCSP
UCSP PKG CODE: B9-2 B2 POSITION IS NOT POPULATED
Chip Information
TRANSISTOR COUNT: 669 PROCESS: BiPOLAR
1 2RLCOUT
As with the input capacitor, choose COUT such that f-3dB is well below the lowest frequency of interest. Setting f-3dB too high affects the low-frequency response of the amplifier. In addition to frequency band considerations, the load impedance is another concern when choosing COUT. Load impedance can vary, changing the -3dB point of the output filter. A lower impedance increases the corner frequency, degrading low-frequency response. Select COUT such that the worst-case load/COUT combination yields an adequate response.
10
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Dual, Rail-to-Rail, High-Output-Drive Op Amp in UCSP
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.)
MAX4369
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 ____________________ 11 (c) 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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