Datasheet MAX4295 (Maxim)
| Fabricante | Maxim |
| Descripción | Mono, 2W, Switch-Mode (Class D) Audio Power Amplifier |
| Páginas / Página | 15 / 1 — Mono, 2W, Switch-Mode (Class D). Audio Power Amplifier. MAX4295. General … |
| Formato / tamaño de archivo | PDF / 545 Kb |
| Idioma del documento | Inglés |
Mono, 2W, Switch-Mode (Class D). Audio Power Amplifier. MAX4295. General Description. Features
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Versión de texto del documento
19-1746; Rev 3; 3/05
Mono, 2W, Switch-Mode (Class D) Audio Power Amplifier MAX4295 General Description Features
The MAX4295 mono, switch-mode (Class D) audio ♦
+2.7V to +5.5V Single-Supply Operation
power amplifier operates from a single +2.7V to +5.5V supply. The MAX4295 has >85% efficiency and is ♦
2W/Channel Output Power at 5V
capable of delivering 2W continuous power to a 4Ω
0.7W/Channel Output Power at 3V
load, making it ideal for portable multimedia and gener- ♦
87% Efficiency (RL = 4
Ω
, POUT = 2W)
al-purpose high-power audio applications. ♦
0.4% THD+N (RL = 4
Ω
, fOSC = 125kHz)
The MAX4295 features a total harmonic distortion plus noise (THD+N) of 0.4% (f ♦
Logic-Programmable PWM Frequency Selection
OSC = 125kHz), low quiescent current of 2.8mA, high efficiency, and clickless power-
(125kHz, 250kHz, 500kHz, 1MHz)
up and shutdown. The SHDN input disables the device ♦
Low-Power Shutdown Mode
and limits supply current to <1.5µA. Other features include a 1A current limit, thermal protection, and ♦
Clickless Transitions Into and Out of Shutdown
undervoltage lockout. ♦
1A Current Limit and Thermal Protection
The MAX4295 reduces the number of required external ♦
Available in Space-Saving Packages
components. Internal high-speed power-MOS transis-
16-Pin QSOP or Narrow SO
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
Ordering Information
optimize the size and cost of the output filter. The MAX4295 is offered in a space-saving 16-pin
PART TEMP RANGE PIN-PACKAGE
QSOP or narrow SO package. MAX4295EEE -40°C to +85°C 16 QSOP
Applications
MAX4295ESE -40°C to +85°C 16 Narrow SO Palmtop/Notebook Boom Boxes Computers AC Amplifiers PDA Audio Battery-Powered Speakers Sound Cards Cordless Phones
Pin Configuration appears at end of data sheet.
Game Cards Portable Equipment
Typical Operating Circuit
RF AOUT OUT+ CIN AUDIO RIN IN INPUT OUT- MAX4295 2.7V TO 5.5V VCC PVCC GND PV 2.7V TO 5.5V CC GND PGND VCM PGND ON SHDN OFF FS1 SS FS2
________________________________________________________________ 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.
Mono, 2W, Switch-Mode (Class D) Audio Power Amplifier MAX4295 General Description Features
The MAX4295 mono, switch-mode (Class D) audio ♦
+2.7V to +5.5V Single-Supply Operation
power amplifier operates from a single +2.7V to +5.5V supply. The MAX4295 has >85% efficiency and is ♦
2W/Channel Output Power at 5V
capable of delivering 2W continuous power to a 4Ω
0.7W/Channel Output Power at 3V
load, making it ideal for portable multimedia and gener- ♦
87% Efficiency (RL = 4
Ω
, POUT = 2W)
al-purpose high-power audio applications. ♦
0.4% THD+N (RL = 4
Ω
, fOSC = 125kHz)
The MAX4295 features a total harmonic distortion plus noise (THD+N) of 0.4% (f ♦
Logic-Programmable PWM Frequency Selection
OSC = 125kHz), low quiescent current of 2.8mA, high efficiency, and clickless power-
(125kHz, 250kHz, 500kHz, 1MHz)
up and shutdown. The SHDN input disables the device ♦
Low-Power Shutdown Mode
and limits supply current to <1.5µA. Other features include a 1A current limit, thermal protection, and ♦
Clickless Transitions Into and Out of Shutdown
undervoltage lockout. ♦
1A Current Limit and Thermal Protection
The MAX4295 reduces the number of required external ♦
Available in Space-Saving Packages
components. Internal high-speed power-MOS transis-
16-Pin QSOP or Narrow SO
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
Ordering Information
optimize the size and cost of the output filter. The MAX4295 is offered in a space-saving 16-pin
PART TEMP RANGE PIN-PACKAGE
QSOP or narrow SO package. MAX4295EEE -40°C to +85°C 16 QSOP
Applications
MAX4295ESE -40°C to +85°C 16 Narrow SO Palmtop/Notebook Boom Boxes Computers AC Amplifiers PDA Audio Battery-Powered Speakers Sound Cards Cordless Phones
Pin Configuration appears at end of data sheet.
Game Cards Portable Equipment
Typical Operating Circuit
RF AOUT OUT+ CIN AUDIO RIN IN INPUT OUT- MAX4295 2.7V TO 5.5V VCC PVCC GND PV 2.7V TO 5.5V CC GND PGND VCM PGND ON SHDN OFF FS1 SS FS2
________________________________________________________________ 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.