MAX4295ESE Maxim Integrated Products, MAX4295ESE Datasheet

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MAX4295ESE

Manufacturer Part Number
MAX4295ESE
Description
Audio Amplifiers
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX4295ESET.pdf (15 pages)

Specifications of MAX4295ESE

Product
Class-D
Output Power
2 W x 1 at 4 Ohms
Output Type
1-Channel Mono
Available Set Gain
115 dB
Thd Plus Noise
0.4 % at 4 Ohms at 1000 mW
Operating Supply Voltage
3 V, 5 V
Maximum Power Dissipation
696 mW
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Package / Case
SOIC-16 Narrow
Audio Load Resistance
8 Ohms
Input Offset Voltage
0.5 m V (Typ) at 5 V
Input Signal Type
Single
Minimum Operating Temperature
- 40 C
Output Signal Type
Differential
Supply Type
Single
Supply Voltage (max)
5.5 V
Supply Voltage (min)
2.7 V
Lead Free Status / Rohs Status
No
Palmtop/Notebook
Computers
PDA Audio
Sound Cards
Game Cards
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 gener-
al-purpose high-power audio applications.
The MAX4295 features a total harmonic distortion plus
noise (THD+N) of 0.4% (f
current of 2.8mA, high efficiency, and clickless power-
up and shutdown. The 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 transis-
tors allow operation as a bridge-tied load (BTL) amplifi-
er. The BTL configuration eliminates the need for
isolation capacitors on the output. The frequency-selec-
table 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.
19-1746; Rev 3; 3/05
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.
AUDIO
INPUT
________________________________________________________________ Maxim Integrated Products
2.7V TO 5.5V
C
IN
General Description
OSC
R
IN
Boom Boxes
AC Amplifiers
Battery-Powered Speakers
Cordless Phones
Portable Equipment
= 125kHz), low quiescent
OFF
ON
Mono, 2W, Switch-Mode (Class D)
Applications
R
F
AOUT
V
GND
FS2
IN
GND
VCM
SHDN
FS1
CC
MAX4295
♦ +2.7V to +5.5V Single-Supply Operation
♦ 2W/Channel Output Power at 5V
♦ 87% Efficiency (R
♦ 0.4% THD+N (R
♦ Logic-Programmable PWM Frequency Selection
♦ Low-Power Shutdown Mode
♦ Clickless Transitions Into and Out of Shutdown
♦ 1A Current Limit and Thermal Protection
♦ Available in Space-Saving Packages
Pin Configuration appears at end of data sheet.
Audio Power Amplifier
0.7W/Channel Output Power at 3V
(125kHz, 250kHz, 500kHz, 1MHz)
MAX4295EEE
MAX4295ESE
16-Pin QSOP or Narrow SO
PGND
PGND
OUT+
PV
PV
OUT-
PART
CC
SS
CC
Typical Operating Circuit
L
= 4Ω, f
L
Ordering Information
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
= 4Ω, P
OSC
OUT
2.7V TO 5.5V
= 125kHz)
= 2W)
PIN-PACKAGE
16 QSOP
16 Narrow SO
Features
1

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MAX4295ESE Summary of contents

Page 1

... 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 MAX4295EEE Applications MAX4295ESE Pin Configuration appears at end of data sheet AOUT IN MAX4295 V CC ...

Page 2

Mono, 2W, Switch-Mode (Class D) Audio Power Amplifier ABSOLUTE MAXIMUM RATINGS GND or PGND....................................-0. PGND to GND.....................................................................±0. .......................................................................±0. VCM, SS, AOUT GND .......................-0. ...

Page 3

ELECTRICAL CHARACTERISTICS (continued) = +5V, SHDN = FS1 = GND, FS2 = otherwise noted. Typical values are T A PARAMETER Input Voltage Range V CC Maximum Output Power V CC Total ...

Page 4

Mono, 2W, Switch-Mode (Class D) Audio Power Amplifier = +3V, input amplifier gain = -1, SHDN = TOTAL HARMONIC DISTORTION PLUS NOISE vs. INPUT FREQUENCY ( ...

Page 5

SHDN = TOTAL HARMONIC DISTORTION PLUS NOISE vs. INPUT FREQUENCY (V = 1. 4Ω L 1MHz 125kHz 1 ...

Page 6

Mono, 2W, Switch-Mode (Class D) Audio Power Amplifier = +3V, input amplifier gain = -1, SHDN = EFFICIENCY vs. OUTPUT POWER (f = 1kHz) IN 100 500kHz 250kHz 1MHz 60 50 ...

Page 7

SHDN = OSCILLATOR FREQUENCY DEVIATION vs. SUPPLY VOLTAGE 0.015 0.010 125kHz 0.005 0 -0.005 -0.010 250kHz 500kHz -0.015 -0.020 1MHz -0.025 2.5 3.0 3.5 4.0 SUPPLY VOLTAGE ...

Page 8

Mono, 2W, Switch-Mode (Class D) Audio Power Amplifier AOUT IN ✕ 0 (VCM) FS1 PWM OSC FS2 SS POWER MANAGEMENT AND PROTECTION CSS Figure 1. Functional Diagram Detailed Description The MAX4295 switch-mode, Class D audio power amplifier is ...

Page 9

Figure 2. PWM Waveforms FS1 and FS2 program the oscillator to a frequency of 125kHz, 250kHz, 500kHz, and 1MHz. The sawtooth oscillator swings between GND and 0.6 input signal is typically AC-coupled to the internal input op amp, whose gain ...

Page 10

Mono, 2W, Switch-Mode (Class D) Audio Power Amplifier Soft-Start (Clickless Startup) The H-bridge is disabled under any of the following conditions: • SHDN low • H-bridge current exceeds the 1A current limit • Thermal overload • Undervoltage lockout The circuit ...

Page 11

An output filter is required to attenuate the PWM switch- ing frequency. Without the filter, the ripple in the load can substantially degrade efficiency and may cause interference problems with other electronic equipment. A Butterworth lowpass filter is chosen for ...

Page 12

Mono, 2W, Switch-Mode (Class D) Audio Power Amplifier The inductor current rating should be higher than the peak current for a given output power requirement and should have relatively constant inductance over tem- perature and frequency. Typically, an open-core induc- ...

Page 13

Mono, 2W, Switch-Mode (Class D) Pin Configuration TOP VIEW GND OUT MAX4295 PGND VCM AOUT 8 9 SO/QSOP ______________________________________________________________________________________ Audio Power ...

Page 14

Mono, 2W, Switch-Mode (Class D) Audio Power Amplifier (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.) 14 ______________________________________________________________________________________ Package Information PACKAGE OUTLINE, QSOP .150", .025" ...

Page 15

... 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 ____________________ 15 © 2005 Maxim Integrated Products ...

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