APA4838

Features:

• Operating Voltage : 4.5V to 5V
• Stereo switchable bridged/single-ended power amplifiers
• DC Volume Control Interface , 0dB to 78dB with precision scale
• Supply Current , IDD = 15mA at Stereo BTL
• Low Shutdown Current , IDD = 0.7A
• Bridge-Tied Load (BTL) or Single-Ended-(SE) Modes Operation
• Output Power at 1% THD+N , VDD=5V
2.3W/Ch (typ) into a 3 Load
2.0W/Ch (typ) into a 4 Load
1.2W/Ch (typ) into a 8 Load
• Output Power at 10% THD+N , VDD=5V
2.8W/Ch (typ) into a 3 Load
2.3W/Ch (typ) into a 4 Load
1.5W/Ch (typ) into a 8 Load
• Single-ended mode at 1.0% THD+N
95mW/Ch (typ) into 32 Load
• Depop Circuitry Integrated
• Thermal shutdown protection and over current protection circuitry
• High supply voltage ripple rejection
• PC99 Compliant
• 28-pin TSSOP-P (with enhanced thermal pad) power package available




Application

• Notebook and Desktop Computers
• Multimedia Monitors
• Portable Applications




Specifications

Symbol	Parameter	Rating	Unit
VDD	Supply Voltage Range	-0.3 to 6	V
VIN	Input Voltage Range, HP sense, Shutdown, Mute, Mode, Gain Select	-0.3 to VDD+0.3	V
TA	Operating Ambient Temperature range	-40 to 85	°C
TJ	Maximum Junction Temperature	Intermal Limited*1	°C
TSTG	Storage Temperature Range	-65 to +150	°C
TS	Soldering Temperature , 10 seconds	260	°C
VESD	Electrostatic Discharge	-2000 to 2000*2	V
PD	Power Dissipation	Intermal Limited	W

Description

The APA4838 is a monolithic integrated circuit , which provides DC volume control , and a stereo bridged audio power amplifiers capable of producing 2.8W (2.3W) into 3 with less than 10% (1.0%) THD+N. APA4838 includes a DC volume control , stereo bridge-tied and single-ended audio power amplifiers , stereo docking outputs , and a selectable gain control , that makes it optimally fittable for notebook PC , multimedia monitors , and other portable applications. The attenuator range of the volume control in APA4838 is from 0dB (DC_Vol=0.8VDD) to 78dB (DC_Vol=0V) with 31 steps. Both of the depop circuitry and the thermal shutdown protection circuitry are integrated in APA4838 , that reduces pops and clicks noise during power up or shutdown mode operation , and protects the chip from being destroyed by over temperature failure. To simplify the audio system design , APA4838 combines a stereo bridgetied loads (BTL) mode for speaker drive and a stereo single-end (SE) mode for headphone drive into a
single chip , where both modes are easily switched by the HP Sense input control pin signal. Besides the low supply current design to increase the efficiency of the amplifiers , APA4838 also features a shutdown function which keeps the supply current only 0.7A (typ).