LYONTEK LY8890BL

®
LY8890
1.0 Watt Audio power Amplifier
Rev. 1.5
FEATURES
GENERAL DESCRIPTION
2.5V~5.5V Power supply.
Thermal shutdown Protection.
Low current shutdown mode
No capacitors and networks or bootstrap
capacitors required
„ Low noise during turn-on and turn-off transitions
„ Lead free and green package available.
(RoHS Compliant)
„ Space Saving Package
- 8-pin MSOP package.
- 8-pin DFN Package
The LY8890 is a 1.0W audio power amplifier. It is
capable of driving 8Ω speaker load at a continuous
average output of 1.0W/1% distortion (THD+N) from
a 5.0V power supply. The LY8890 primarily
designed for high quality application in other
portable communication device. And the LY8890
audio amplifier features low power consumption
shutdown mode. It is achieved by driving the
shutdown pin with logic low. And the LY8890 has an
internal thermal shutdown protection feature.
The LY8890 audio amplifier was designed
specifically to provide high quality output power with
a minimal amount of external components. The
LY8890 does not require output capacitors, and the
LY8890 is ideally suited for other low voltage
applications or portable electronic devices where
minimal power consumption is a primary
requirement.
„
„
„
„
APPLICATION
„ Portable electronic devices
„ Mobile Phones
„ PDAs
PIN CONFIGURATION
Lyontek Inc. reserves the rights to change the specifications and products without notice.
5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
FAX: 886-3-6668836
1
®
LY8890
1.0 Watt Audio power Amplifier
Rev. 1.5
PIN DESCRIPTION
SYMBOL
Pin No.
DESCRIPTION
MSOP
DFN
SHUTDOWN
1
1
Shutdown the device.(when low level is active the pin)
BYPASS
2
2
Bypass pin
+IN
3
3
Positive Input
-IN
4
4
Negative Input
Vo1
5
5
Negative output
VDD
6
6
Power Supply
GND
7
7
Ground
Vo2
8
8
Positive Output
APPLICATION CIRCUIT
Figure 1. Audio Amplifier with Single –Ended Input
Lyontek Inc. reserves the rights to change the specifications and products without notice.
5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
FAX: 886-3-6668836
2
®
LY8890
1.0 Watt Audio power Amplifier
Rev. 1.5
Figure 2. Audio Amplifier with Differential Input
ABSOLUTE MAXIMUN RATINGS*
PARAMETER
Supply Voltage
Operating Temperature
Input Voltage
Storage Temperature
Power Dissipation
ESD Susceptibility
Junction Temperature
Soldering Temperature (under 10 sec)
SYMBOL
VDD
TA
VI
TSTG
PD
VESD
TJMAX
TSOLDER
RATING
6.0
-40 to 85 (I grade)
-0.3V to VDD +0.3V
-65 to 150
Internally Limited
2000
150
260
Lyontek Inc. reserves the rights to change the specifications and products without notice.
5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
FAX: 886-3-6668836
3
UNIT
V
℃
V
℃
W
V
℃
℃
®
LY8890
1.0 Watt Audio power Amplifier
Rev. 1.5
DC ELECTRICAL CHARACTERISTICS (VDD=5V, TA=25℃)
PARAMETER
Power Supply Current
SYMBOL
IDD
TEST CONDITION
VIN = 0V, IO = 0A, No Load
VIN = 0V, IO = 0A, 8Ω Load
VSHUTDOWN = 0V
Shutdown Current
ISD
Shutdown Voltage Input High
VSDIH
Shutdown Voltage Input Low
VSDIL
Output Offset Voltage
VOS
Resistor Output to GND
ROUT-GND
Output Power (8Ω)
Po
THD = 2% (max), f = 1 kHz
Total Harmonic Distortion+ Noise THD+N Po = 0.4 Wrms; f = 1kHz
Vripple = 200mV sine p-p
Input terminated with 10Ω
Power Supply Rejection Ratio
PSRR
to GND
Wake-up time
TWU
Thermal Shutdown Temperature
Shut Down Time
TSD
TSDT
Bypass pin Cap. = 0.22 uF
Bypass pin Cap. = 0.33 uF
Bypass pin Cap. = 0.47 uF
Bypass pin Cap. = 1.0 uF
MIN.
1.2
7.0
150
8 Ω load
TYP.
4.0
5.0
0.1
7.0
8.5
1.0
0.2
57 (f =
217Hz)
66 (f =
1kHz)
168
224
326
524
170
1.0
MAX.
10.0
15.0
2.0
0.4
50.0
9.7
UNIT
mA
mA
µA
V
V
mV
kΩ
W
%
-
dB
190
ms
ms
ms
ms
℃
ms
TYP.
3.5
4.5
0.1
7.0
8.5
0.31
0.1
57 (f =
217Hz)
65 (f =
1kHz)
101
140
207
376
170
MAX.
9.0
14.0
2.0
0.4
50.0
9.7
-
UNIT
mA
mA
µA
V
V
mV
kΩ
W
%
-
dB
190
ms
ms
ms
ms
℃
DC ELECTRICAL CHARACTERISTICS (VDD=3V, TA=25℃)
PARAMETER
Power Supply Current
SYMBOL
IDD
TEST CONDITION
VIN = 0V, IO = 0A, No Load
VIN = 0V, IO = 0A, 8Ω Load
VSHUTDOWN = 0V
Shutdown Current
ISD
Shutdown Voltage Input High
VSDIH
Shutdown Voltage Input Low
VSDIL
Output Offset Voltage
VOS
Resistor Output to GND
ROUT-GND
Output Power (8Ω)
Po
THD = 1% (max), f = 1 kHz
Total Harmonic Distortion+ Noise THD+N Po = 0.15 Wrms , f = 1kHz
Vripple = 200mV sine p-p
Input terminated with 10Ω
Power Supply Rejection Ratio
PSRR
to GND
Wake-up time
TWU
Thermal Shutdown Temperature
TSD
Bypass pin Cap. = 0.22 uF
Bypass pin Cap. = 0.33 uF
Bypass pin Cap. = 0.47 uF
Bypass pin Cap. = 1.0 uF
MIN.
1.2
7.0
0.28
150
Lyontek Inc. reserves the rights to change the specifications and products without notice.
5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
FAX: 886-3-6668836
4
®
LY8890
1.0 Watt Audio power Amplifier
Rev. 1.5
ORDERING INFORMATION
LY 8 890 VV
V : Package Type
UL : 8-Pin MSOP
BL:8-Pin DFN
Product Name
A : Product Line
LY : Lyontek Product Number Prefix
TYPICAL PERFORMANCE CHARACTERISTICS
Figure 3
THD+N vs Frequency
at VDD=5V, RL=8Ω, PWR=250mW, AV=2
Lyontek Inc. reserves the rights to change the specifications and products without notice.
5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
FAX: 886-3-6668836
5
®
LY8890
1.0 Watt Audio power Amplifier
Rev. 1.5
Figure 4
THD+N vs Frequency
at VDD=3.3V, RL=8Ω, PWR=250mW, AV=2
Figure 5
THD+N vs Frequency
at VDD=3V, RL=8Ω, PWR=250mW, AV=2
Lyontek Inc. reserves the rights to change the specifications and products without notice.
5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
FAX: 886-3-6668836
6
®
LY8890
1.0 Watt Audio power Amplifier
Rev. 1.5
Figure 6
THD+N vs Frequency
at VDD=2.6V, RL=8Ω, PWR=250mW, AV=2
Figure 7
THD+N vs Frequency
at VDD=2.6V, RL=4Ω, PWR=250mW, AV=2
Lyontek Inc. reserves the rights to change the specifications and products without notice.
5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
FAX: 886-3-6668836
7
®
LY8890
1.0 Watt Audio power Amplifier
Rev. 1.5
Figure 8
THD+N vs Power Out
@ VDD=5V, RL=8Ω, f=1kHz, AV=2
Figure 9
THD+N vs Power Out
@ VDD=3.3V, RL=8Ω, f=1kHz, AV=2
Figure 10
THD+N vs Power Out
@ VDD=3V, RL=8Ω, f=1kHz, AV=2
Lyontek Inc. reserves the rights to change the specifications and products without notice.
5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
FAX: 886-3-6668836
8
®
LY8890
1.0 Watt Audio power Amplifier
Rev. 1.5
Figure 11
THD+N vs Power Out
@ VDD=2.6V, RL=8Ω, f=1kHz, AV=2
Figure 12
THD+N vs Power Out
@ VDD=2.6V, RL=4Ω, f=1kHz, AV=2
Lyontek Inc. reserves the rights to change the specifications and products without notice.
5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
FAX: 886-3-6668836
9
®
LY8890
1.0 Watt Audio power Amplifier
Rev. 1.5
Figure 13
Power Supply Rejection Ratio (PSRR) @ Av=2
VDD=5V, V ripple =200mvp-p, RL=8Ω, RIN=Float
Figure 14
Power Supply Rejection Ratio (PSRR) @ Av=2
VDD=3V, V ripple =200mvp-p, RL=8Ω, RIN=Float
Lyontek Inc. reserves the rights to change the specifications and products without notice.
5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
FAX: 886-3-6668836
10
®
LY8890
1.0 Watt Audio power Amplifier
Rev. 1.5
Figure 15
Power Supply Rejection Ratio (PSRR) @ Av=4
VDD=5V, V ripple =200mvp-p, RL=8Ω, RIN=Float
Figure 16
Power Supply Rejection Ratio (PSRR) @ Av=4
VDD=3V, V ripple =200mvp-p, RL=8Ω, RIN=Float
Lyontek Inc. reserves the rights to change the specifications and products without notice.
5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
FAX: 886-3-6668836
11
®
LY8890
1.0 Watt Audio power Amplifier
Rev. 1.5
Figure 17
Power Supply Rejection Ratio (PSRR) @ Av=2
VDD=5V, V ripple =200mvp-p, RL=8Ω, RIN=10Ω
Figure 18
Power Supply Rejection Ratio (PSRR) @ Av=2
VDD=3V, V ripple =200mvp-p, RL=8Ω, RIN=10Ω
Lyontek Inc. reserves the rights to change the specifications and products without notice.
5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
FAX: 886-3-6668836
12
®
LY8890
1.0 Watt Audio power Amplifier
Rev. 1.5
Figure 19
Power Supply Rejection Ratio (PSRR) @ Av=2
VDD=3.3V, V ripple =200mvp-p, RL=8Ω, RIN=10Ω
Figure 20
Power Supply Rejection Ratio (PSRR) @ Av=2
VDD=2.6V, V ripple =200mvp-p, RL=8Ω, RIN=10Ω
Lyontek Inc. reserves the rights to change the specifications and products without notice.
5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
FAX: 886-3-6668836
13
®
LY8890
1.0 Watt Audio power Amplifier
Rev. 1.5
Figure 21
Power Supply Rejection Ratio (PSRR) @ Av=4
VDD=5V, V ripple =200mvp-p, RL=8Ω, RIN=10Ω
Figure 22
Power Supply Rejection Ratio (PSRR) @ Av=4
VDD=3V, V ripple =200mvp-p, RL=8Ω, RIN=10Ω
Lyontek Inc. reserves the rights to change the specifications and products without notice.
5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
FAX: 886-3-6668836
14
®
LY8890
1.0 Watt Audio power Amplifier
Rev. 1.5
APPLICATION INFORMATION
BRIDGED CONFIGURATION EXPLANATION
As shown in Figure 1, the LY8890 has two operational amplifiers internally, allowing for a few different
amplifier configurations. The first amplifier’s gain is externally configurable, while the second amplifier is
internally fixed in a unity-gain, inverting configuration. The closed-loop gain of the first amplifier is set by
selecting the ratio of Rf to RIN while the second amplifier’s gain is fixed by the two internal 20kΩ resistors.
Figure 1 shows that the output of amplifier one serves as the input to amplifier two which results in both
amplifiers producing signals identical in magnitude, but out of phase by 180°. Consequently, the differential
gain for the IC is
AVD= 2 X ( Rf / RIN )
By driving the load differentially through outputs Vo1 and Vo2, an amplifier configuration commonly referred to
as “bridged mode” is established. Bridged mode operation is different from the classical single-ended
amplifier configuration where one side of the load is connected to ground.
A bridge amplifier design has a few distinct advantages over the single-ended configuration, as it provides
differential drive to the load, thus doubling output swing for a specified supply voltage. Four times the output
power is possible as compared to a single-ended amplifier under the same conditions.
This increase in attainable output power assumes that the amplifier is not current limited or clipped. In order to
choose an amplifier’s closed-loop gain without causing excessive clipping, please refer to the Audio Power
Amplifier Design section.
A bridge configuration, such as the one used in the LY8890, also creates a second advantage over single
-ended amplifiers. Since the differential outputs, Vo1 and Vo2, are biased at half-supply, no net DC voltage
exists across the load. This eliminates the need for an output coupling capacitor which is required in a single
supply, single-ended amplifier configuration. Without an output coupling capacitor, the half-supply bias across
the load would result in both increased internal IC power dissipation and also possible loudspeaker damage.
Power Dissipation
Power dissipation is a major concern when designing a successful amplifier, whether the amplifier is bridged
or single-ended. A direct consequence of the increased power delivered to the load by a bridge amplifier is an
increase in internal power dissipation. Since the LY8890 has two operational amplifiers in one package, the
maximum internal power dissipation is 4 times that of a single-ended amplifier. The maximum power
dissipation for a given application can be derived from the power dissipation graphs of from equation 1.
PDMAX = 4 X (VDD)2 / (2 π2 RL) ……………………………..(1)
It is critical that the maximum junction temperature TJMAX of 150°C is not exceeded. TJMAX can be
determine from the power derating curves by using PDMAX and the PC board foil area. By adding additional
copper foil, the thermal resistance of the application can be reduced, resulting in higher PDMAX. Additional
copper foil can be added to any of the leads connected to the LY8890.If TJMAX still exceeds 150°C, then
additional changes must be made. These changes can include reduced supply voltage, higher load
impedance, or reduced ambient temperature. Internal power dissipation is a function of output power.
POWER SUPPLY BYPASSING
As with any amplifier, proper supply bypassing is critical for low noise performance and high power supply
rejection. The capacitor location on both the bypass and power supply pins should be as close to the device
as possible.
Lyontek Inc. reserves the rights to change the specifications and products without notice.
5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
FAX: 886-3-6668836
15
®
LY8890
1.0 Watt Audio power Amplifier
Rev. 1.5
PACKAGE OUTLINE DIMENSION
8 pin 25.6 mil MSOP Package Outline Dimension
Lyontek Inc. reserves the rights to change the specifications and products without notice.
5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
FAX: 886-3-6668836
16
®
LY8890
1.0 Watt Audio power Amplifier
Rev. 1.5
8 Pin DFN Package Outline Dimension
Lyontek Inc. reserves the rights to change the specifications and products without notice.
5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
FAX: 886-3-6668836
17