Mono, 2W, Switch-Mode (Class D) Audio Power Amplifier

Overview

Technical Documents

Ordering Info

Status

Active: In Production.

Description

The MAX4295 mono, switch-mode (Class D) audio power amplifier operates from a single +2.7V to +5.5V supply. The MAX4295 has > 85% efficiency and is capable of delivering 2W continuous power to a 4Ω load, making it ideal for portable multimedia and general-purpose high-power audio applications.

The MAX4295 features a total harmonic distortion plus noise (THD+N) of 0.4% (f_OSC = 125kHz), low quiescent current of 2.8mA, high efficiency, and clickless power-up and shutdown. The active-low SHDN input disables the device and limits supply current to < 1.5µA. Other features include a 1A current limit, thermal protection, and undervoltage lockout.

The MAX4295 reduces the number of required external components. Internal high-speed power-MOS transistors allow operation as a bridge-tied load (BTL) amplifier. The BTL configuration eliminates the need for isolation capacitors on the output. The frequency-selectable pulse-width modulator (PWM) allows the user to optimize the size and cost of the output filter.

The MAX4295 is offered in a space-saving 16-pin QSOP or narrow SO package.

Data Sheet

Download	Rev 3	(PDF, 544kB)
E-Mail

An evaluation kit is available: MAX4295EVKIT

Key Features

+2.7V to +5.5V Single-Supply Operation
2W/Channel Output Power at 5V
0.7W/Channel Output Power at 3V
87% Efficiency (R_L = 4Ω, P_OUT = 2W)
0.4% THD+N (R_L = 4Ω, f_OSC = 125kHz)
Logic-Programmable PWM Frequency Selection (125kHz, 250kHz, 500kHz, 1MHz)
Low-Power Shutdown Mode
Clickless Transitions Into and Out of Shutdown
1A Current Limit and Thermal Protection
Available in Space-Saving Packages
- 16-Pin QSOP or Narrow SO

Applications/Uses

AC Amplifiers
Battery-Powered Speakers
Boom Boxes
Cordless Phones
Game Cards
Palmtop/Notebook Computers
PDA Audio
Portable Equipment
Sound Cards

Diagram

Typical Operating Circuit

Application Notes

Application Note 624		Class D Audio Amplifier Output Filter Optimization
Tutorial 1760		High-Efficiency Class D Audio Amplifiers Extend Battery Life in Portable Applications
Application Note 1951		Class D Motor-Speed Control

Product Guides

Amplifiers and Comparators (PDF)

Reliability Reports

Reliability Report:	MAX4295.pdf
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Software/Models

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Ordering Information

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Tape and Reel

Sample

Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX4295EEE			Active	QSOP;16 pin;30.9 mm² Outline Drawing:21-0055 (PDF) Land Pattern: 90-0167 (PDF) Use pkgcode/variation: E16-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX4295EEE+			Active	QSOP;16 pin;30.9 mm² Outline Drawing:21-0055 (PDF) Land Pattern: 90-0167 (PDF) Use pkgcode/variation: E16+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX4295EEE+T			Active	QSOP;16 pin;30.9 mm² Outline Drawing:21-0055 (PDF) Land Pattern: 90-0167 (PDF) Use pkgcode/variation: E16+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX4295EEE-T			Active	QSOP;16 pin Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX4295ESE			Active	SOIC(N);16 pin;61.9 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0097 (PDF) Use pkgcode/variation: S16-5*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX4295ESE+			Active	SOIC(N);16 pin;61.9 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0097 (PDF) Use pkgcode/variation: S16+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX4295ESE+T			Active	SOIC(N);16 pin;61.9 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0097 (PDF) Use pkgcode/variation: S16+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX4295ESE-T			Active	N.SO;16 pin Land Pattern: Not Available	-40°C to +85°C	See data sheet

Notes:

Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
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Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.