Preliminary AD5165A 2.5W Mono Filter-less Class-D Audio

ESMT
Preliminary
AD5165A
2.5W Mono Filter-less Class-D Audio Amplifier
Features
Description
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The AD5165A is a mono, filter-less class-D audio
amplifier. Operating with 5.0V loudspeaker driver
supply, it can deliver 2.5W output power into 4 Ω
loudspeaker within 10% THD+N.
Supply voltage range: 2.5 V to 5.5 V
Support single-ended or differential analog input
Low static operation current
Low shut-down current
Short power-on transient time
Internal pull-low resistor on shut-down pins
Short-circuit protection
Over-temperature protection
Loudspeaker power within 10% THD+N
„ 1.5W/ch into 8Ω loudspeaker
„ 2.5W/ch into 4Ω loudspeaker
z Loudspeaker efficiency
„ 89% @ 8Ω, THD+N=10%
„ 84% @ 4Ω, THD+N=10%
The AD5165A packaged as DFN 8L is a mono
audio amplifier with high efficiency and suitable for
the notebook computer, and portable multimedia
devices.
Ordering Information
Part Number
Package
Comments
AD5165A
DFN 8L, 3x3 mm
Pb-free
Applications
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Monitor audio
PDA
Portable multimedia devices
Notebook computer
Mobile phone
Functional Block Diagram
Gain=300k /Rin
PVDD; AVDD
Cs
~300k
+
Cin
Differential
input
Cin
-
Rin
INP
+
PWMA
PWM
Generator
Rin
-
Loudspeaker
Driver
+
INN
PWMB
~300k
-wave
Generator
SD#
~300k
Overload, Voltage
& Thermal
Protection
Thermal Pad; PGND
Elite Semiconductor Memory Technology Inc.
Publication Date: Sep. 2007
Revision: 0.1
1/12
ESMT
Preliminary
AD5165A
Pin Assignments
DFN 8L, 3x3mm
SD# 1
8 PWMB
AVDD 2
7 PGND
INP
3
INN
4
6
9:Thermal Pad
PVDD
5 PWMA
Pin Description
Pin
NAME
TYP
DESCRIPTION
1
SD#
I
Shutdown AD5165A (Low active logic)
2
AVDD
P
Power Supply
3
INP
I
Positive differential input
4
INN
I
Negative differential input
5
PWMA
O
Positive output
6
PVDD
P
High current power supply
7
PGND
G
High current ground
8
PWMB
O
Negative output
9
Thermal Pad
G
Must be soldered to PCB’s ground plane
Available Package
Package Type
Device no.
θJA (oC/W)
Exposed Thermal Pad
DFN 8L (3x3)
AD5165A
45.8
Yes
Note1: The thermal pad is at the bottom of package. To optimize the performance of thermal
dissipation, solder the thermal pad to PCB’s ground plane is suggested.
Elite Semiconductor Memory Technology Inc.
Publication Date: Sep. 2007
Revision: 0.1
2/12
ESMT
Preliminary
AD5165A
Absolute Maximum Ratings
SYMBOL
PARAMETER
MIN
MAX
UNIT
AVDD
Supply for lower power analog cells
2.5
5.0
V
PVDD
Supply for loudspeaker driver
2.5
5.0
V
Input voltage
-0.3
AVDD
Tstg
Ta
Storage temperature
-65
Ambient operating temperature
V
o
C
150
0
o
C
70
Recommended Operating Conditions
SYMBOL
PARAMETER
TYP
UNIT
AVDD
Supply for lower power analog cells
2.5~5.0
V
PVDD
Supply for loudspeaker driver
2.5~5.0
V
VIH
High-Level Input Voltage
2.0
V
VIL
Low-Level Input Voltage
0.8
Ta
Ambient Operating Temperature
V
o
C
0~70
General Electrical Characteristics
SYMBOL
PARAMETER
IPD
Supply current during
power-down mode
Voffset
Output offset voltage
fsw
RSC
CONDITION
MIN
AVDD=PVDD=5.0V;
SD#=0
Input ac grounded,
VDD=2.5V~5.0V
TYP
MAX
UNIT
2
50
μA
5
25
mV
Junction temperature for
driver shutdown
145
150
155
Temperature hysteresis for
recovery from shutdown
115
120
125
Switching rate of
loudspeakers driver
300
450
600
kHz
2.8
3.2
Ω
Loudspeaker short-circuit
PVDD = 5 V
detect resistance
Elite Semiconductor Memory Technology Inc.
o
C
o
C
Publication Date: Sep. 2007
Revision: 0.1
3/12