Datasheet

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General Description

The MAX4364/MAX4365 are bridged audio power

amplifiers intended for portable audio devices with

internal speakers. The MAX4364 is capable of deliver-

ing 1.4W from a single 5V supply and 500mW from a

single 3V supply into an 8Ω load. The MAX4365 is

capable of delivering 1W from a single 5V supply and

450mW from a single 3V supply into an 8Ω load. The

MAX4364/MAX4365 feature 0.04% THD+N at 1kHz,

68dB PSRR at 217Hz, and only 10nA of supply current

in shutdown mode.

The MAX4364/MAX4365 bridged outputs eliminate the

need for output-coupling capacitors, minimizing exter-

nal component count. The MAX4364/MAX4365 also

include internal DC bias generation, clickless operation,

short-circuit and thermal-overload protection. Both

devices are unity-gain stable, with the gain set by two

external resistors.

The MAX4364 is available in a small 8-pin SO package.

The MAX4365 is available in tiny 8-pin TDFN (3mm 

3mm  0.8mm) and µMAX

packages.

Applications

Cellular Phones

PDAs

Two-Way Radios

General-Purpose Audio

Features

o 1.4W into 8Ω Load (MAX4364)

o 1W into 8Ω Load (MAX4365)

o 0.04% THD+N at 1kHz

o 68dB PSRR at 217Hz

o 2.7V to 5.5V Single-Supply Operation

o 5mA Supply Current

o Low-Power, 10nA Shutdown Mode

o Pin Compatible with the LM4861/LM4862/LM4864

(MAX4364)

o Clickless Power-Up and Shutdown

o Thermal-Overload and Short-Circuit Protection

o Available in TDFN, µMAX, and SO Packages

MAX4364/MAX4365

1.4W and 1W, Ultra-Small, Audio Power

Amplifiers with Shutdown

________________________________________________________________

Maxim Integrated Products

Ordering Information

19-2387; Rev 4; 5/11

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.

PART TEMP RANGE PIN-PACKAGE

TOP

MARK

MAX4364ESA+ -40°C to +85°C 8 SO —

MAX4365EUA+ -40°C to +85°C 8 µMAX —

MAX4365ETA+ -40°C to +85°C 8 TDFN-EP* ACD

OUT-

IN-

IN+

BIAS

50kΩ

10kΩ

AUDIO

INPUT

CLICKLESS/POPLESS

SHUTDOWN CONTROL

GND

SHDN

OUT+

MAX4364

Typical Application Circuit/Functional Diagram

Pin Configurations appear at end of data sheet.

EP = Exposed pad.

Denotes a lead(Pb)-free/RoHS-compliant package.

µMAX is a registered trademark of Maxim Integrated Products, Inc.

Summary of content (14 pages)

PAGE 1
9-2387; Rev 4; 5/11 1.4W and 1W, Ultra-Small, Audio Power Amplifiers with Shutdown Features The MAX4364/MAX4365 are bridged audio power amplifiers intended for portable audio devices with internal speakers. The MAX4364 is capable of delivering 1.4W from a single 5V supply and 500mW from a single 3V supply into an 8Ω load. The MAX4365 is capable of delivering 1W from a single 5V supply and 450mW from a single 3V supply into an 8Ω load. The MAX4364/MAX4365 feature 0.
PAGE 2
MAX4364/MAX4365 1.4W and 1W, Ultra-Small, Audio Power Amplifiers with Shutdown ABSOLUTE MAXIMUM RATINGS VCC, OUT_ to GND...................................................-0.3V to +6V IN+, IN-, BIAS, SHDN to GND....................-0.3V to (VCC + 0.3V) Output Short Circuit (OUT+ to OUT-) (Note 1)...........Continuous Continuous Power Dissipation (TA = +70°C) 8-Pin µMAX (derate 4.8mW/°C above +70°C) ..............388mW 8-Pin TDFN (derate 24.4mW/°C above +70°C) ..........1951mW 8-Pin SO (derate 7.
PAGE 3
1.4W and 1W, Ultra-Small, Audio Power Amplifiers with Shutdown (VCC = 5V, RL = ∞, CBIAS = 1µF to GND, VSHDN = VGND, TA = +25°C, unless otherwise noted.) (Note 3) PARAMETER Total Harmonic Distortion Plus Noise SYMBOL THD+N Noise Short-Circuit Current ISC CONDITIONS AV = -2V/V, RL = 8Ω, fIN = 1kHz (Notes 5, 9) MIN TYP MAX4364, POUT = 1W 0.04 MAX4365, POUT = 750mW 0.
PAGE 4
Typical Operating Characteristics (VCC = 5V, THD+N measurement bandwidth = 22Hz to 22kHz, TA = +25°C, unless otherwise noted.) MAX4364 TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY MAX4364 TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY VCC = 5V AV = 2V/V RL = 8Ω VCC = 5V AV = 4V/V RL = 8Ω 1 THD+N (%) THD+N (%) THD+N (%) 0.25W 0.1 0.25W 1W 0.01 0.01 1k 10k 0 100 1k 0 10k 100 1k 10k FREQUENCY (Hz) FREQUENCY (Hz) FREQUENCY (Hz) MAX4364 TOTAL HARMONIC DISTORTION PLUS NOISE vs.
PAGE 5
1.4W and 1W, Ultra-Small, Audio Power Amplifiers with Shutdown MAX4364 OUTPUT POWER vs. SUPPLY VOLTAGE 20kHz 0.1 1kHz 0.01 MAX4364 toc11 10% THD+N 1500 1000 500 20Hz 3000 VCC = 5V fIN = 1kHz 2400 OUTPUT POWER (mW) THD+N (%) 1 RL = 8Ω fIN = 1kHz 2000 OUTPUT POWER (mW) VCC = 3V AV = 4V/V RL = 8Ω 10 2500 MAX4364 toc10 100 MAX4364 OUTPUT POWER vs. LOAD RESISTANCE MAX4364 toc12 MAX4364 TOTAL HARMONIC DISTORTION PLUS NOISE vs.
PAGE 6
Typical Operating Characteristics (continued) 80 VCC = 5V AV = 2V/V RL = 8Ω THD+N (%) THD+N (%) 40 VCC = 5V AV = 4V/V RL = 8Ω 1 1 60 10 MAX4364 toc20 VCC = 5V SUPPLY CURRENT (nA) 10 MAX4364 toc19 100 MAX4364 toc21 (VCC = 5V, THD+N measurement bandwidth = 22Hz to 22kHz, TA = +25°C, unless otherwise noted.) MAX4365 MAX4365 MAX4364 TOTAL HARMONIC DISTORTION TOTAL HARMONIC DISTORTION SHUTDOWN SUPPLY CURRENT PLUS NOISE vs. FREQUENCY PLUS NOISE vs. FREQUENCY vs. TEMPERATURE 0.25W 0.5W 0.25W 0.
PAGE 7
1.4W and 1W, Ultra-Small, Audio Power Amplifiers with Shutdown MAX4365 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER 20Hz 20kHz 0.1 0.01 MAX4364 toc29 20kHz 1 20Hz 0.1 RL = 8Ω fIN = 1kHz 2000 1kHz 0.01 1kHz 2500 OUTPUT POWER (mW) THD+N (%) 1 VCC = 3V AV = 4V/V RL = 8Ω 10 THD+N (%) VCC = 3V AV = 2V/V RL = 8Ω 10 100 MAX4364 toc28 100 MAX4365 OUTPUT POWER vs. SUPPLY VOLTAGE MAX4364 toc30 MAX4365 TOTAL HARMONIC DISTORTION PLUS NOISE vs.
PAGE 8
Typical Operating Characteristics (continued) (VCC = 5V, THD+N measurement bandwidth = 22Hz to 22kHz, TA = +25°C, unless otherwise noted.) MAX4365 SHUTDOWN SUPPLY CURRENT vs. TEMPERATURE MAX4365 SHUTDOWN SUPPLY CURRENT vs. SUPPLY VOLTAGE 8 6 4 MAX4364 toc38 VCC = 5V 70 SUPPLY CURRENT (nA) 10 SUPPLY CURRENT (nA) 80 MAX4364 toc37 12 60 50 40 30 20 2 10 0 0 -40 5.5 3.4 4.1 4.8 SUPPLY VOLTAGE (V) 10 60 35 85 TEMPERATURE (°C) POWER-SUPPLY REJECTION RATIO vs. FREQUENCY GAIN AND PHASE vs.
PAGE 9
1.4W and 1W, Ultra-Small, Audio Power Amplifiers with Shutdown The MAX4364/MAX4365 bridged audio power amplifiers can deliver 1.4W into 8Ω (MAX4364) or 1W into 8Ω (MAX4365) while operating from a single 5V supply. These devices consist of two high-output-current op amps configured as a bridge-tied load (BTL) amplifier (see Typical Application Circuit/Functional Diagram). The gain of the device is set by the closed-loop gain of the input op amp.
PAGE 10
MAX4364/MAX4365 1.4W and 1W, Ultra-Small, Audio Power Amplifiers with Shutdown The increase in power delivered by the BTL configuration directly results in an increase in internal power dissipation over the single-ended configuration. The maximum power dissipation for a given VCC and load is given by the following equation: PDISS(MAX) = 2 π RL Thermal-overload protection limits total power dissipation in the MAX4364/MAX4365.
PAGE 11
1.4W and 1W, Ultra-Small, Audio Power Amplifiers with Shutdown MAX4364/MAX4365 VCC 6 CLICKLESS/ POPLESS SHUTDOWN CONTROL VCC 50kΩ 2 SHDN 1 OUT- 8 BIAS CBIAS 50kΩ 3 IN+ 10kΩ 10kΩ OUT+ 5 CIN AUDIO INPUT RIN 4 IN- MAX4364 MAX4365 GND 7 RF CF Figure 2. High-Gain Configuration Table 1. Efficiency in a 5V, 8Ω BTL System OUTPUT POWER (W) INTERNAL POWER DISSIPATION (W) EFFICIENCY (%) 0.25 0.55 31.4 0.50 0.63 44.4 0.75 0.63 54.4 1.00 0.59 62.8 1.25 0.53 70.2 1.40 0.48 74.
PAGE 12
MAX4364/MAX4365 1.4W and 1W, Ultra-Small, Audio Power Amplifiers with Shutdown Clickless/Popless Operation Proper selection of AC-coupling capacitors (CIN) and CBIAS achieves clickless/popless shutdown and startup. The value of CBIAS determines the rate at which the midrail bias voltage rises on startup and falls when entering shutdown. The size of the input capacitor also affects clickless/popless operation.
PAGE 13
1.4W and 1W, Ultra-Small, Audio Power Amplifiers with Shutdown PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO. 8 SO S8+5 21-0041 90-0096 8 µMAX U8+1 21-0036 90-0092 8 TDFN T833+2 21-0137 90-0059 ______________________________________________________________________________________ 13 MAX4364/MAX4365 Package Information For the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages.
PAGE 14
MAX4364/MAX4365 1.