The Intersil ISL54000, ISL54001, ISL54002 family of devices
are integrated audio power amplifier systems that combine
stereo BTL 8Ω amplifiers in a single package. The devices are
designed to operate from a single +2.7V to +5V power supply .
All devices are offered in a 2 0 Ld 4x4 thin QFN p ackag e.
Targeted applications include handheld equipment such as
cell-phones, MP3 players, and games/toys.
The ISL54000, ISL54001, ISL54002 parts contain two class
AB bridge-tied (BTL) type power amplifiers for driving stereo
8Ω speakers. Each BTL is capable of delivering 800mW (typ)
with 0.4% THD+N and 941mW (typ) with 1% THD+N of
continuous average power into an 8Ω BTL speaker load
when using a 5V supply.
The ISL54001 and ISL54002 feature a 2:1 stereo input
multiplexer front-end. This allows selection between two
stereo sources. In addition the ISL54002 has the capability
of mixing the stereo inputs.
All devices in this family feature low power shutdown,
thermal overload protection and click/pop suppression. The
click and pop circuitry eliminates audible transients during
audio source changes and transitioning in and out of
shutdown.
*Add “-T” suffix for tape and reel.
NOTE: Intersil Pb-free products employ special Pb-free material sets;
molding compounds/die attach materials and 100% matte tin plate
termination finish, which are RoHS compliant and compatible with both
SnPb and Pb-free soldering operations. Intersil Pb-free products are
MSL classified at Pb-free peak reflow temperatures that meet or
exceed the Pb-free requirements of IPC/JEDEC J STD-020C.
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product reliability and
result in failures not covered by warranty.
NOTE:
is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. θ
1. θ
JA
“case temp” is measured at the center of the exposed metal pad on the package underside. See Tech Brief TB379.
2. For θ
, the “case temp” location is the center of the exposed metal pad on the package underside.
4. The algebraic convention, whereby the most negative value is a minimum and the most positive a maximum, is used in this data sheet.
5. Parts are 100% tested at +25°C. Over temperature limits established by characterization and are not production tested.
ISL54000 Typical Application Circuit and Block Diagram
0.1µF
RIGHT AUDIO
LEFT AUDIO
CONTROLLER
MICRO
0.22µF
0.22µF
IN
R
IN
L
CLICK AND POP
SD
THERMAL
PROTECTION
LOGIC CONTROL
BTL
BTL
V
BIAS
GND
DD
OUTR+
OUTR-
OUTL+
OUTL-
REF
C
1µF
REF
6
FN6458.1
June 28, 2007
ISL54000, ISL54001, ISL54002
ISL54001 Typical Application Circuit and Block Diagram
0.1µF
RIGHT 1 AUDIO
RIGHT 2 AUDIO
LEFT 1 AUDIO
LEFT 2 AUDIO
CONTROLLER
0.22µF
0.22µF
0.22µF
0.22µF
MICRO
IN
1R
IN
2R
IN
1L
IN
2L
CLICK AND POP
SD
INS
MUX
MUX
THERMAL
PROTECTION
LOGIC CONTROL
BTL
BTL
ISL54002 Typical Application Circuit and Block Diagram
V
DD
BIAS
GND
OUTR+
OUTR-
OUTL+
OUTL-
REF
C
1µF
REF
RIGHT 1 AUDIO
RIGHT 2 AUDIO
LEFT 1 AUDIO
LEFT 2 AUDIO
CONTROLLER
MICRO
0.22µF
0.22µF
0.22µF
0.22µF
IN
1R
IN
2R
IN
1L
IN
2L
CLICK AND POP
SD
INS
MIX
MUX/MIXER
MUX/MIXER
THERMAL
PROTECTION
LOGIC CONTROL
BLT
BLT
V
DD
BIAS
GND
0.1µF
OUTR+
OUTR-
OUTL+
OUTL-
REF
C
1µF
REF
7
FN6458.1
June 28, 2007
ISL54000, ISL54001, ISL54002
Detailed Description
The Intersil ISL54000, ISL54001, ISL54002 family of devices
are integrated audio power amplifier systems designed to
drive 8
Ω speaker loads. They can operate with a supply
voltage of +2.7V to +5V and provide good quality audio, while
requiring minimal external components. Its low 0.4% THD+N
while driving 800mW into an 8
distortion amplification of the audio signals. The devices are
offered in a 20 Ld 4x4 TQFN package. Targeted applications
include handheld equipment such as cell-phones, MP3
players, and games/toys.
The ISL54000, ISL54001, ISL54002 parts contain two class
AB bridge-tied (BTL) type power amplifiers for driving stereo
8Ω speakers. When powered with a 5V supply, each BTL is
capable of delivering 941mW (typ) of continuous average
power to an 8Ω speaker load with 1% THD+N performance.
When the speaker load is connected across the positive and
negative terminals of the BTL driver, the voltage is doubled
across the load and the power is quadrupled.
The ISL54001 and ISL54002 feature a 2:1 stereo input
multiplexer front-end. This allows selection between two
stereo sources. The INS control pin determines which stereo
input is active. Applying a logic “0” to the INS control pin
selects stereo input 1 (R1 and L1). Applying a logic “1” to the
INS control pin selects stereo input 2 (R2 and L2).
The ISL54002 has the capability of mixing the two stereo
inputs. When in MIX Mode (MIX = “1”) the ISL54002 mixes
the R1 input with the R2 input and sends the combined
signal to the OUTR_ BTL driver and it mixes the L1 input
with the L2 input and sends the combined signal to the
OUTL_ BTL driver.
All devices in this family feature low power shutdown,
thermal overload protection and click/pop suppression. The
click and pop circuitry prohibits switching between input
channels until the audio input signals are at their lowest
point, which eliminates audible transients in the speakers
when changing audio input sources. The click/pop circuitry
also keeps speaker transients to an inaudibile level when
entering and leaving shutdown.
Typical application circuits and block diagrams for each
device in the family are on page 6 and page 7.
Ω speaker ensures clean, low
required to calculate the capacitor value is:
C 1 6.28 f 100kΩ••⁄≥
The 100k
ISL54000, ISL54001, and ISL54002 devices.
Ω is the impedance looking into the input of the
(EQ. 1)
BTL Speaker Amplifiers
The ISL54000, ISL54001, and ISL54002 contains two
bridge-tied load (BTL) amplifiers designed to drive a speaker
load differentially. The output from one BTL is OUTL+ and
OUTL-. The output of the other BTL is OUTR+ and OUTR-.
A single BTL driver consists of inverting and non-inverting
power op amps. The AC signal out of each op amp are equal
in magnitude but 180° out of phase,so the AC signal at
OUTL+ and OUTL- have the same amplitude but are 180°
out of phase. The same is true of OUTR+ and OUTR-. The
speaker load gets connected between the + terminal and terminal outputs.
Driving the load differentially using a BTL configuration
doubles the output voltage across the speaker load and
quadruples the power to the load. In effect you get a gain of
two due to this configuration at the load as compared to
driving the load with a single-ended amplifier with its load
connected between a single amplifier ’s output and ground.
The outputs of each BTL are biased at V
load gets connected across the + and - terminal of the BTL,
the mid supply DC bias voltage at each output gets
cancelled out eliminating the need for large bulky output
coupling capacitors.
/2. When the
DD
Low Power Shutdown
With a logic “1” at the SD control pin the device enters the
low power shutdown state. When in shutdown the output
amplifiers go into an high impedance state and supply
current is reduced to 26
In shutdown mode before the amplifiers enter the high
impedance/low current drive state, the bias voltage of V
remains connected at the output through a 100kΩ resistor.
This resistor is not present during active operation of the
drivers but gets switched in when the SD pin goes high and
disconnected when the SD pin goes low.
μA (typ).
DD
/2
DC Bias Voltage
The ISL54000, ISL54001, and ISL54002 have internal DC
bias circuitry, which DC offsets the incoming audio signal at
V
/2. When using a 5V supply, the DC offset will be 2.5V.
DD
When using a 3.6V supply, the DC offset will be 1.8V.
Since the signal gets biased internally at V
signals need to be AC coupled to the inputs of the device.
The value of the AC coupling capacitor depends on the low
frequency range required for the application. A capacitor of
0.22
μF will pass a signal as low as 7.2Hz. The formula
8
/2, the audio
DD
Leaving the DC bias voltage connected through this 100kΩ
resistor reduces the transient that is generated across the
speaker, while going into or out of shutdown, to a level that
does not produce clicking or popping in the speaker.
QFN Thermal Pad Considerations
The QFN package features an exposed thermal pad on its
underside. This pad lowers the package’s thermal resistance
by providing a direct heat conduction path from the die to the
PCB. Connect the exposed thermal pad to GND by using a
large copper pad and multiple vias to the GND plane. The
FN6458.1
June 28, 2007
ISL54000, ISL54001, ISL54002
vias should be plugged and tented with plating and solder
mask to ensure good thermal conductivity.
Best thermal performance is achieved with the largest
practical copper ground plane area.
PCB Layout Considersations and Power
Supply Bypassing
To maintain the highest load dissipation and widest output
voltage swing the power supply PCB traces and the traces
that connect the output of the drivers to the speaker loads
should be made as wide as possible to minimize losses due
to parasitic trace resistance.
Typical Performance Curves T
1.0
0.9
VDD = 5V
0.8
BTL
= 8Ω
R
0.7
L
P
= 800mW
O
0.6
0.5
0.4
0.3
THD+N (%)
0.2
= +25°C, Unless Otherwise Specified.
A
Proper supply bypassing is necessary for high power supply
rejection and low noise performance. A filter network
consisting of a 10µF capacitor in parallel with a 0.1µF
capacitor is recommended at the voltage regulator that is
providing the power to the ISL54000, ISL54001, and
ISL54002 IC.
Local bypass capacitors of 0.1µF should be put at each V
DD
pin of the ISL54000, ISL54001, ISL54002 devices. They
should be located as close as possible to the pin, keeping
the length of leads and traces as short as possible.
A 1µF capacitor from the REF pin (pin 10) to ground is
needed for optimum PSRR and internal bias voltage stability.
1.0
VDD = 3.6V
0.9
0.8
BTL
R
0.7
= 8Ω
L
P
= 200mW
0.6
O
0.5
0.4
0.3
THD+N (%)
0.2
0.1
2020k50100 200500 1k2k5k10k
FREQUENCY (Hz)
FIGURE 1. THD+N vs FREQUENCY
10
VDD = 5V
5
BTL
= 8Ω
R
L
2
f = 1kHz
1
0.50
0.20
THD+N (%)
0.10
0.05
0.02
0.01
10m120m50m100m200m500m
OUTPUT POWER (W)
FIGURE 3. THD+N vs OUTPUT POWERFIGURE 4. THD+N vs OUTPUT POWER
0.1
2020k50100 200500 1k2k5k10k
FREQUENCY (Hz)
FIGURE 2. THD+N vs FREQUENCY
10
VDD = 3.6V
5
BTL
= 8Ω
R
L
f = 1kHz
2
1
0.50
0.20
THD+N (%)
0.10
0.05
0.02
0.01
10m600m20m40m70m 100m200m
OUTPUT POWER (W)
9
FN6458.1
June 28, 2007
ISL54000, ISL54001, ISL54002
Typical Performance Curves T
-40
VDD = 5V
-45
= 800mW
P
O
-50
-55
-60
-65
-70
-75
-80
-85
-90
CROSSTALK (dB)
-95
-100
-105
-110
-115
-120
2020k50100 2005001k2k5k10k
FIGURE 5. CROSSTALK vs FREQUENCYFIGURE 6. OFFISOLATION vs FREQUENCY
20 LEAD QUAD FLAT NO-LEAD PLASTIC PACKAGE
(COMPLIANT TO JEDEC MO-220WGGD-1 ISSUE I)
MILLIMETERS
SYMBOL
A0.700.750.80-
A1-0.020.05-
A2-0.550.809
A30.20 REF9
b0.180.250.305, 8
D4.00 BSC-
D13.75 BSC9
D21.952.102.257, 8
E4.00 BSC-
E13.75 BSC9
E21.952.102.257, 8
e 0.50 BSC-
k0.20 -- -
L0.350.600.758
N202
Nd53
Ne53
P- -0.609
θ--129
NOTES:
1. Dimensioning and tolerancing conform to ASME Y14.5-1994.
2. N is the number of terminals.
3. Nd and Ne refer to the number of terminals on each D and E.
4. All dimensions are in millimeters. Angles are in degrees.
5. Dimension b applies to the metallized terminal and is measured
between 0.15mm and 0.30mm from the terminal tip.
6. The configuration of the pin #1 identifier is optional, but must be
located within the zone indicated. The pin #1 identifier may be
either a mold or mark feature.
7. Dimensions D2 and E2 are for the exposed pads which provide
improved electrical and thermal performance.
8. Nominal dimensions are provided to assist with PCB Land Pattern
Design efforts, see Intersil Technical Brief TB389.
9. Features and dimensions A2, A3, D1, E1, P & θ are present when
Anvil singulation method is used and not present for saw
singulation.
NOTESMINNOMINALMAX
Rev. 0 11/04
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems.
Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without
notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and
reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result
from its use. No license is granted by implicat ion or oth erwise u nde r any p a tent or p at ent r ights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
11
FN6458.1
June 28, 2007
Loading...
+ hidden pages
You need points to download manuals.
1 point = 1 manual.
You can buy points or you can get point for every manual you upload.