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MAX4337EKA+中文资料

General Description

The MAX4335–MAX4338 op amps deliver 40mW per channel into 32?from ultra-small SC70/SOT23 pack-ages 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 0.04μA 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 μMAX package, respectively. All devices are specified from -40°C to +85°C.

________________________Applications

32?Headphone Drivers

Portable/Battery-Powered Instruments Wireless PA Control Hands-Free Car Phones Transformer/Line Drivers DAC/ADC Buffers

Features

o 50mA Output Drive Capability o Low 0.003% THD (20kHz into 10k ?)o Rail-to-Rail ?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 0.04μA Places Output in High-Impedance State o Thermal Overload Protection

MAX4335–MAX4338

SC70/SOT23-8, 50mA I OUT , Rail-to-Rail I/O

Op Amps with Shutdown/Mute

________________________________________________________________Maxim Integrated Products

19-2136; Rev 1; 9/01

Pin Configurations appear at end of data sheet.

Rail-to-Rail is a registered trademark of Nippon Motorola Ltd.

For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at https://www.wendangku.net/doc/ec7243590.html,.

Typical Operating Circuit

M A X 4335–M A X 4338

SC70/SOT23-8, 50mA I OUT , Rail-to-Rail I/O Op Amps with Shutdown/Mute 2_______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

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.

Supply Voltage (V CC to GND)..................................-0.3V to +6V All Other Pins to GND....................(GND - 0.3V) to (V CC + 0.3V)Output Short-Circuit Duration to V CC or GND............Continuous Continuous Power Dissipation (T A = +70°C)

6-Pin SC70 (derate 3.1mW/°C above +70°C)...............245mW 8-Pin SOT23 (derate 9.1mW/°C above +70°C).............727mW

8-Pin μMAX (derate 4.5mW/°C above +70°C)..............362mW 10-Pin μMAX (derate 5.6mW/°C above +70°C).............444mW Operating Temperature Range ...........................-40°C to +85°C Junction Temperature......................................................+150°C Storage Temperature Range.............................-65°C to +150°C Lead Temperature (soldering, 10s).................................+300°C

DC ELECTRICAL CHARACTERISTICS

(V CC = 2.7V, GND = 0, V CM = 0, V OUT = V CC /2, R L = ∞to V CC /2, V SHDN = V CC,T A = +25°C , unless otherwise noted.)

MAX4335–MAX4338

SC70/SOT23-8, 50mA I OUT , Rail-to-Rail I/O

Op Amps with Shutdown/Mute

_______________________________________________________________________________________3

DC ELECTRICAL CHARACTERISTICS (continued)

(V CC = 2.7V, GND = 0, V CM = 0, V OUT = V CC /2, R L = ∞to V CC /2, V SHDN = V CC,T A = +25°C , unless otherwise noted.)

DC ELECTRICAL CHARACTERISTICS

(V CC = 2.7V, GND = 0, V CM = 0, V OUT = V CC /2, R L = ∞to V CC /2, V SHDN = V CC,T A = -40°C to +85°C , unless otherwise noted.) (Note 1)

M A X 4335–M A X 4338

SC70/SOT23-8, 50mA I OUT , Rail-to-Rail I/O Op Amps with Shutdown/Mute 4_______________________________________________________________________________________

DC ELECTRICAL CHARACTERISTICS (continued)

(V CC = 2.7V, GND = 0, V CM = 0, V OUT = V CC /2, R L = ∞to V CC /2, V SHDN = V CC,T A = -40°C to +85°C , unless otherwise noted.)

AC ELECTRICAL CHARACTERISTICS

(V CC = 2.7V, GND = 0, V CM = V CC /2, V OUT = V CC /2, V SHDN = V CC, A VCL = 1V/V, C L = 15pF, R L = ∞to V CC /2,T A = +25°C , unless otherwise noted.)

MAX4335–MAX4338

SC70/SOT23-8, 50mA I OUT , Rail-to-Rail I/O

Op Amps with Shutdown/Mute

_______________________________________________________________________________________5

AC ELECTRICAL CHARACTERISTICS (continued)

(V CC = +2.7V, GND = 0, V CM = V CC /2, V OUT = V CC /2, V SHDN = V CC, A VCL = 1V/V, C L = 15pF, R L = ∞to V CC /2, T A = +25°C , unless otherwise noted.)

__________________________________________Typical Operating Characteristics

(V CC = 2.7V, GND = 0, V CM = 0, V OUT = V CC /2, R L = ∞to V CC /2, V SHDN = V CC,T A = +25°C, unless otherwise noted.)

1.41.3

1.2

1.1

1.0-40

-15

TEMPERATURE (°C)

S U P P L Y C U R R E N T (m A )

SUPPLY CURRENT PER AMPLIFIER

vs. TEMPERATURE

1.51.61.71.8

1.9

2.02.12.22.3-40

-15

85TEMPERATURE (°C)M I N I M U M O P E R A T I N G V O L T A G E (V )

MINIMUM OPERATING VOLTAGE

vs. TEMPERATURE

3002001004005006007008009001000

TEMPERATURE (°C)

S U P P L Y C U R R E N T (p A )

SHUTDOWN SUPPLY CURRENT

vs. TEMPERATURE

-40-1510356085

M A X 4335–M A X 4338

SC70/SOT23-8, 50mA I OUT , Rail-to-Rail I/O Op Amps with Shutdown/Mute 6_______________________________________________________________________________________

-200

-100-1500-5050100

0231456

INPUT BIAS CURRENT vs. COMMON-MODE VOLTAGE

COMMON-MODE VOLTAGE (V)

I N P U T B I A S C U R R E N T (n A )

-1.0

-0.4-0.6-0.8-0.200.20.40.60.81.0

TEMPERATURE (°C)

I N P U T O F F S E T V O L T A G E (m V )

INPUT OFFSET VOLTAGE vs. TEMPERATURE

-40

-15

-250

-150-2000-50-10015010050200

TEMPERATURE (°C)-40

-15

I N P U T B I A S C U R R E N T (n A )

INPUT BIAS CURRENT vs. TEMPERATURE

8081

8485

TEMPERATURE (°C)

-40

-15

C M R R (d B )

COMMON-MODE REJECTION RATIO

vs. TEMPERATURE

050150

100

200250

1.6

OUTPUT CURRENT vs. OUTPUT VOLTAGE

(SINKING)

OUTPUT VOLTAGE (V)

O U T P U T C U R R E N T (m A )

0.8

0.4

1.2

10050200150300250350O U T P U T H I G H V O L T A G E (m V )

OUTPUT HIGH VOLTAGE vs. TEMPERATURE

TEMPERATURE (°C)

-40-1510356085

120160200240280320360400440480O U T P U T L O W

V O L T A G E (m V )

TEMPERATURE (°C)-40-1510356085OUTPUT LOW VOLTAGE vs. TEMPERATURE

050

150

100

200250

OUTPUT VOLTAGE (V)

O U T P U T C U R R E N T (m A )

1.6

OUTPUT CURRENT vs. OUTPUT VOLTAGE

(SOURCING)

0.40.60.2

0.8 1.0 1.2 1.4

6595

8511510500.20.10.30.40.5

LARGE-SIGNAL GAIN vs. OUTPUT VOLTAGE

(SINKING, V CC = 5.5V)

OUTPUT VOLTAGE (V)

L A R G E -S I G N A L G A I N (d B )

Typical Operating Characteristics (continued)

(V CC = 2.7V, GND = 0, V CM = 0, V OUT = V CC /2, R L = ∞to V CC /2, V SHDN = V CC,T A = +25°C, unless otherwise noted.)

FREQUENCY (Hz)

P S R R (d B )

100

10k 100k 1M

10M

-110

-90-70-30-50-1010-100-80-60-20-400POWER-SUPPLY REJECTION RATIO

vs. FREQUENCY

1000.01

10k

10M

OUTPUT IMPEDANCE vs. FREQUENCY

0.1

FREQUENCY (Hz)

O U T P U T I M P E D A N C E (?)

100k 0.040

0.0350.0300.0250.0200.0150.0100.005

010

1k 10k

100

100k

TOTAL HARMONIC DISTORTION AND

NOISE vs. FREQUENCY

FREQUENCY (Hz)

T H D + N O I S E (%)

MAX4335–MAX4338

SC70/SOT23-8, 50mA I OUT , Rail-to-Rail I/O

Op Amps with Shutdown/Mute

_______________________________________________________________________________________7

5070609080110100120

LARGE-SIGNAL GAIN vs. OUTPUT VOLTAGE

(SOURCING, V CC = 5.5V)

OUTPUT VOLTAGE (V)

L A R G E -S I G N A L G A I N (d B )

0.1

0.20.30.40.535

55657585951051150.10.20.30.40.5

LARGE-SIGNAL GAIN vs. OUTPUT VOLTAGE

(SINKING, V CC = 2.7V)

OUTPUT VOLTAGE (V)

L A R G E -S I G N A L G A I N (d B )

5070609010080110

0.050.250.350.150.450.550.650.75

LARGE-SIGNAL GAIN vs. OUTPUT VOLTAGE

(SOURCING, V CC = 2.7V)

OUTPUT VOLTAGE (V)

L A R G E -S I G N A L G A I N (d B )

5070609080100110-40

-15

85LARGE-SIGNAL GAIN vs. TEMPERATURE

TEMPERATURE (°C)L A R G E -S I G N A L G A I N (d B )

70-30

1001k 10k 100k 1M

10M -10FREQUENCY (Hz)

G A I N (d B )

P H A S E (D E G R E E S )103050-2002040

GAIN AND PHASE vs. FREQUENCY

216-14472108180144

360-108

-36-7270-30100

10k

100k

10M

-10FREQUENCY (Hz)

G A I N (d B )

P H A S E (D E G R E E S )103050-200204060GAIN AND PHASE vs. FREQUENCY

(C L = 200pF)

216-14472108180144

360-108

-36-72Typical Operating Characteristics (continued)

(V CC = 2.7V, GND = 0, V CM = 0, V OUT = V CC /2, R L = ∞to V CC /2, V SHDN = V CC,T A = +25°C, unless otherwise noted.)

M A X 4335–M A X 4338

SC70/SOT23-8, 50mA I OUT , Rail-to-Rail I/O Op Amps with Shutdown/Mute 8_______________________________________________________________________________________

-60

-110

100

100k

10M

CHANNEL-TO-CHANNEL ISOLATION

vs. FREQUENCY

-80

-90-100

-70

FREQUENCY (Hz)

C H A N N E L -T O -C H A N N E L I S O L A T I O N

10k

SMALL-SIGNAL TRANSIENT RESPONSE

(NONINVERTING)

M A X 4335 t o c 24

IN 20mV/div

OUT 20mV/div

200ns/div

LARGE-SIGNAL TRANSIENT RESPONSE

(NONINVERTING)

M A X 4335 t o c 26

IN 2V/div

OUT 2V/div

2μs/div

V CC = 5V

SMALL-SIGNAL TRANSIENT RESPONSE

(INVERTING)

M A X 4335 t o c 25

IN 20mV/div

OUT 20mV/div

200ns/div LARGE-SIGNAL TRANSIENT RESPONSE

(INVERTING)

IN 2V/div

OUT 2V/div

2μs/div

0.001

3.0

4.0

3.5

5.0

5.5

TOTAL HARMONIC DISTORTION PLUS NOISE vs. PEAK-TO-PEAK OUTPUT VOLTAGE

0.01

0.1

1PEAK-TO-PEAK OUTPUT VOLTAGE (V)

T H D + N O I S E (%)

4.5

____________________________Typical Operating Characteristics (continued)

(V CC = 2.7V, GND = 0, V CM = 0, V OUT = V CC /2, R L = ∞to V CC /2, V SHDN = V CC,T A = +25°C, unless otherwise noted.)

MAX4335–MAX4338

SC70/SOT23-8, 50mA I OUT , Rail-to-Rail I/O

Op Amps with Shutdown/Mute

_______________________________________________________________________________________9

Pin Description

Typical Application Circuit

M A X 4335–M A X 4338

SC70/SOT23-8, 50mA I OUT , Rail-to-Rail I/O Op Amps with Shutdown/Mute 10______________________________________________________________________________________

Applications Information

Package Power Dissipation

Warning: Due to the high-output-current drive, this op amp can exceed the absolute maximum power-dissi-pation rating.As a general rule, as long as the peak cur-rent 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:

where:V RMS = the RMS voltage from V CC to V OUT

when sourcing current

=the RMS voltage from V OUT to V EE when sinking current

I RMS = the RMS current flowing out of or into

the op amp and the load

θ= the phase difference between the

voltage and the current. For resistive loads, COS θ= 1.For example, the circuit in Figure 1 has a package power dissipation of 220mW.

Therefore, P IC(DISS)= V RMS I RMS COS θ= 220mW

Adding a coupling capacitor improves the package power dissipation because there is no DC current to the load, as shown in Figure 2.

Therefore, P IC(DISS)= V RMS I RMS COS θ

= 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 79°C (220.6mW/°C plus a derating of 3.1mW/°C x 9°C = 247.9mW). Note that the 247.9mW just exceeds the absolute maximum

power dissipation of 245mW for the 6-pin SC70 package.

P V I COS IC DISS RMS RMS ()?θ

Figure 1. A Circuit Example where the MAX4335/MAX4336 is Dissipating High Power

Figure 2. A Circuit Example where Adding a Coupling

Capacitor Greatly Reduces the Power Dissipation of Its Package

MAX4335–MAX4338

SC70/SOT23-8, 50mA I OUT , Rail-to-Rail I/O

Op Amps with Shutdown/Mute

______________________________________________________________________________________

Single-Supply Speaker Driver

The MAX4335/MAX4336 can be used as a single-sup-ply speaker driver, as shown in the Typical Operating Circuit . Capacitor C1 is used for blocking DC (a 0.1μF ceramic capacitor can be used). When choosing resis-tors R3 and R4, take into consideration the input bias current as well as how much supply current can be tol-erated. Choose resistors R1 and R2 according to the amount of gain and current desired. Capacitor C3ensures unity gain for DC. A 10μF electrolytic capacitor is suitable for most applications. The coupling capaci-tor C2 sets a low-frequency pole and is fairly large in value. For a 32?load, a 100μF coupling capacitor gives a low-frequency pole at 50Hz. The low-frequency pole can be set according to the following equation:

?= 1 / 2π (R L C2)

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 opera-tion. 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 volt-ages 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 V CC /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 capaci-tance, 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:

I BIAS = (V DIFF - 1.2V) / 8.4k ?

Rail-to-Rail Output Stage

The minimum output is within millivolts of ground for single-supply operation, where the load is referenced to ground (G ND). Figure 6 shows the input voltage range and the output voltage swing of a MAX4335 con-nected as a voltage follower. The maximum output volt-age swing is load dependent; however, it is guaranteed to be within 400mV of the positive rail (V CC = 2.7V)even with maximum load (32?to V CC /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.

Figure 3. Reducing Offset Error Due to Bias Current (Noninverting)

Figure 4. Reducing Offset Error Due to Bias Current (Inverting)

M A X 4335–M A X 4338

SC70/SOT23-8, 50mA I OUT , Rail-to-Rail I/O Op Amps with Shutdown/Mute 12

______________________________________________________________________________________

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 capaci-tive-load-driving circuit in the unity-gain configuration.The resistor improves the circuit ’s phase margin by iso-lating the load capacitor from the op amp ’s output.

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 0.04μA per amplifier (V CC = 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 5μs 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 0.1μF ceramic capacitor in parallel with at least 1μF.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.

Thermal Overload Protection

The MAX4335–MAX4338 includes thermal overload protection circuitry. When the junction temperature of the device exceeds +140°C, the supply current drops to 120μA per amplifier (V CC = 5V) and the outputs are placed in a high-impedance state. The device returns to normal operation when the junction temperature falls to below +120°C.

Short-Circuit Current Protection

The MAX4335–MAX4338 incorporate a smart short-cir-cuit protection feature. Figure 7 shows the output volt-age region where the protection circuitry is active. A fault condition occurs when I OUT > 110mA and V OUT >1V (sinking current) or when I OUT > 110mA and (V CC -V OUT ) > 1V (sourcing current). When a fault is detect-ed, 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 ).

Figure 5. Input Protection Circuit

MAX4335–MAX4338

SC70/SOT23-8, 50mA I OUT , Rail-to-Rail I/O

Op Amps with Shutdown/Mute

______________________________________________________________________________________

Figure 6. Rail-to-Rail Input/Output Range

Figure 7. Short-Circuit Protection

1300110012001000900800V CC = 5.0V R L to V CC /2UNSTABLE REGION

Figure 8. Capacitive-Load Stability

M A X 4335-f i g 08

1μs/div

V CC = 3.0V, C L = 330pF R L = 100k ?, R ISO = 0

Figure 9. Small-Signal Transient Response with Excessive Capacitive Load

M A X 4335–M A X 4338

SC70/SOT23-8, 50mA I OUT , Rail-to-Rail I/O Op Amps with Shutdown/Mute 14______________________________________________________________________________________

M A X 4335-f i g 11

5μs/div Figure 12. Shutdown Output Voltage Enable/Disable M A X 4335-f i g 12

5μs/div

Figure 13. Power-Up/Down Output Voltage

1μs/div

V CC = 3.0V, C L = 330pF R L = 100k ?, R ISO = 39?

Figure 10. Small-Signal Transient Response with Excessive Capacitive Load with Isolation Resistor

Figure 11. Capacitive-Load-Driving Circuit

MAX4335–MAX4338

SC70/SOT23-8, 50mA I OUT , Rail-to-Rail I/O

Op Amps with Shutdown/Mute

______________________________________________________________________________________15

___________________Chip Information

MAX4335 TRANSISTOR COUNT: 1200MAX4336 TRANSISTOR COUNT: 1200MAX4337 TRANSISTOR COUNT: 2400MAX4338 TRANSISTOR COUNT: 2400PROCESS: BiCMOS

Pin Configurations

M A X 4335–M A X 4338

SC70/SOT23-8, 50mA I OUT , Rail-to-Rail I/O Op Amps with Shutdown/Mute

Package Information

(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,

MAX4335–MAX4338

SC70/SOT23-8, 50mA I OUT , Rail-to-Rail I/O

Op Amps with Shutdown/Mute

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?2001 Maxim Integrated Products

Printed USA

is a registered trademark of Maxim Integrated Products.

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 https://www.wendangku.net/doc/ec7243590.html,/packages .)