® LY8891 1.0 Watt Audio power Amplifier Rev. 1.4 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 LY8891 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 LY8891 primarily designed for high quality application in other portable communication device. And the LY8891 audio amplifier features low power consumption shutdown mode. It is achieved by driving the shutdown pin with logic low. And the LY8891 has an internal thermal shutdown protection feature. The LY8891 audio amplifier was designed specifically to provide high quality output power with a minimal amount of external components. The LY8891 does not require output capacitors, and the LY8891 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 ® LY8891 1.0 Watt Audio power Amplifier Rev. 1.4 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 ® LY8891 1.0 Watt Audio power Amplifier Rev. 1.4 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 ℃ ℃ ® LY8891 1.0 Watt Audio power Amplifier Rev. 1.4 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 Power Supply Rejection Ratio PSRR Vripple = 200mV sine p-p Input terminated with 10Ω to GND Wake-up time Thermal Shutdown Temperature Shut Down Time TWU TSD TSDT 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) 176 170 1.0 MAX. 10.0 15.0 2.0 0.4 50.0 9.7 TYP. 3.5 4.5 0.1 7.0 8.5 0.31 0.1 57 (f = 217Hz) 65 (f = 1kHz) 114 170 MAX. 9.0 14.0 2.0 0.4 50.0 9.7 - 190 UNIT mA mA µA V V mV kΩ W % dB 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 Power Supply Rejection Ratio PSRR Vripple = 200mV sine p-p Input terminated with 10Ω to GND Wake-up time Thermal Shutdown Temperature TWU TSD 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 - UNIT mA mA µA V V mV kΩ W % dB 190 ms ℃ ® LY8891 1.0 Watt Audio power Amplifier Rev. 1.4 ORDERING INFORMATION LY 8 891 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 ® LY8891 1.0 Watt Audio power Amplifier Rev. 1.4 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 ® LY8891 1.0 Watt Audio power Amplifier Rev. 1.4 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 ® LY8891 1.0 Watt Audio power Amplifier Rev. 1.4 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 ® LY8891 1.0 Watt Audio power Amplifier Rev. 1.4 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 ® LY8891 1.0 Watt Audio power Amplifier Rev. 1.4 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 ® LY8891 1.0 Watt Audio power Amplifier Rev. 1.4 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 ® LY8891 1.0 Watt Audio power Amplifier Rev. 1.4 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 ® LY8891 1.0 Watt Audio power Amplifier Rev. 1.4 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 ® LY8891 1.0 Watt Audio power Amplifier Rev. 1.4 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 ® LY8891 1.0 Watt Audio power Amplifier Rev. 1.4 APPLICATION INFORMATION BRIDGED CONFIGURATION EXPLANATION As shown in Figure 1, the LY8891 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 LY8891, 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 LY8891 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 LY8891.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 ® LY8891 1.0 Watt Audio power Amplifier Rev. 1.4 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 ® LY8891 1.0 Watt Audio power Amplifier Rev. 1.4 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