LTK5313 CHIPSOURCETEK | Alldatasheet
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Operating Voltage: 2.8V-5V Four AGC modes Integrated Charge-Pumped with Adaptive Control No External Inductor and Diode Required Output Power at 10% THD+N – 5W, at VDD=4.2V, RL=4Ω at 1% THD+N – 4.2W, at VDD=4.2V, RL=4Ω Thermal and Over-Current Protections One-Wire Pulse Control Ultra Now Noise: 90uV Excellent de-POP function Space Saving Packages ESOP-10 Lead Free and Green Device Available (RoHS Compliant) LTK5313 Applications Bluetooth audio; Smart audio Loud speaker Portable multimedia device Consumer audio equipment LTK5313 General Description The LTK5313 is a mono, filter -free Class -D audio amplifier with capacitor charge-pumped integrated, available in ESOP-10 package. The built -in charge-pumped converter generates selectable 6.4V supply voltage for the Class -D amplifier. This provides a much louder audio output than a stand-alone amplifier directly connected to the battery. The Automatic Gain Control (AGC) adjusts Class -D gain to prevent heavy clipping. The LTK5313 also provide AB/D function, this function can completely avoid the FM disturbance when set to AB mode. High PSRR and differential architecture provide increased immunity to noise and RF rectification. In addition to these features, a fast startup time and small package size make the LTK5313 an ideal choice for portable devices. Moreover, the LTK5313 provides thermal and short circuit protection. LTK5313 Simplified Application Circuit OUT+ LTK5313 OUT- Cin IN- GND Rin IN- RL AVDD 2. 5V~5V IN+ Cin Rin IN+ (ESO P-10) EN EN STATUS 0~0.5V 1. 1~1.4V AB Disable 1. 8~2.1V D AGC On 2. 3~5.5V D AGC Off One P ulse Control CP CN 4. 7uF CPOUT 470uF 1uF VDD 1uF1uF470u Fig.1 Application Circuit LTK5313 Order and Marking Information LTK5313 Assembly Material Handling Code Packge Code Packge Code ES: ESOP-10 Handling Code TR: Tape & Reel Assembly Material G: Halogen and Lead Free Device LTK5313 ESP: LTK5313 XXYY X - Data Code Y – Lot Number LTK5313 5W Mono Charge-Pumped Class AB/D Audio Power Amplifier TEL: +86-0755-27595155 27595165 FAX: +86-0755-27594792 WEB:Http://www.ChipSourceTek.com E-mail: Sales@ChipSourceTek.com Tony.Wang@ChipSourceTek.com Rev. P.2 – Apr., 2020 矽源特科技 ChipSourceTek
2LTK5313 Pin Configuration VDD CP CN CPOUT OUT+ OUT- IN- ESOP-10 EN 6IN+AVDD GND Fig.2 Pin Configuration LTK5313 Pin Function Description NO. NAME IO FUNCTION DESCRIPTION
1 VDD IO Power for Charge-Pump
2 CP IO Flying Positive Connected to External Cap
3 CN IO Flying Negative Connected to External Cap
4 EN I Shutdown, AGC, AB/D Control
5 AVDD IO Input Analog Power Input
6 IN+ I Positive Audio Input
7 IN- I Negative Audio Input
8 OUTP O Positive Audio Output
9 OUTN O Negative Audio Output
10 CPOUT O Charge-Pumped Output Power
11 PGND IO Exposed Ground Pad
SYMBOL PARAMETER RATING UNIT AVDD Supply Voltage (VDD to GND) 5V VDD Supply Voltage (VDD to GND) 5V TJ Maximum Junction Temperature 150 οC TSTG Storage Temperature Range -65 to +150 TSDR Soldering Temperature Range 230 PD Power Dissipation Internally Limited W Note 1.Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. LTK5313 Thermal Characteristics TEL: +86-0755-27595155 27595165 FAX: +86-0755-27594792 WEB:Http://www.ChipSourceTek.com E-mail: Sales@ChipSourceTek.com Tony.Wang@ChipSourceTek.com Rev. P.2 – Apr., 2020 矽源特科技 ChipSourceTek
SYMBOL PARAMETER VALUE UNIT θJA Thermal Resistance -Junction to Ambient (Note 2) 160 οC Note 2. Please refer to “Layout Recommendation”, the Thermal Pad on the bottom of the IC should soldered directly to the PCB's Thermal Pad area that with several thermal vias connect to t he ground plan, and the PCB is a 2 -layer, 5-inch square area with 2oz copper thickness. TEL: +86-0755-27595155 27595165 FAX: +86-0755-27594792 WEB:Http://www.ChipSourceTek.com E-mail: Sales@ChipSourceTek.com Tony.Wang@ChipSourceTek.com Rev. P.2 – Apr., 2020 矽源特科技 ChipSourceTek
LTK5313 Recommended Operating Conditions Symbol Parameter Min. Max. Unit VDD Supply Voltage 3 5 V VIH High Level Threshold Voltage EN 1.5 VIL Low Level Threshold Voltage EN 0.4 TA Ambient Temperature Range -40 85 οC TJ Junction Temperature Range -40 125 RL Speaker Resistance 3.5 Ω VDD=3.7V, GND=0V, AV=22dB, TA= 25οC (unless otherwise noted) Symbol Parameter Test Condition Min. Typ. Max. Unit IDD Supply Current Class D mode 6 mA IDD Supply Current Class AB mode 6 mA ISD Shutdown Current EN=0V 10 µA FOSC1 Class D Frequency VBAT=3.7V 450 680 700 kHz FOSC2 Charge Pump Frequency VBAT=3.7V 1000 1200 1300 kHz RDS(ON) Static Drain-Source On-State Resistance (PMOSFET+NMOSFET) PVDD=6.4V, IL=1A NMOSFET 120 mΩ PVDD=6.4V, IL=1A PMOSFET 150 η Efficiency PO=1W, RL=4Ω+33µH 80 % PO=4.7W, RL=4Ω+33µH 79 RL=4Ω THD+N Total Harmonic Distortion Pulse Noise THD+N=1%, fin=1kHz, VBAT=4.2V, PVDD=6.4V RL=4Ω 4.2 W RL=8Ω 2.5 THD+N=10%, fin=1kHz, VBAT=4.2V, PVDD=6.4V RL=4Ω 5.0 RL=8Ω 2.82 VOS Output Offset Voltage RL=4Ω 20 mV Vn Noise Output Voltage With A-weighted Filter, RL=4Ω 90 µVrms S/N Signal to Noise Ratio With A-weighted Filter PO=2W, RL=4Ω 80 dB PSRR Power Supply Rejection Ratio RL=4Ω, fin=217Hz, Vrr=0.2Vpp -80 -60 Attshutdown Shutdown Attenuation fin=1kHz, RL=8Ω, Vin=1Vpp -115 -90 TEL: +86-0755-27595155 27595165 FAX: +86-0755-27594792 WEB:Http://www.ChipSourceTek.com E-mail: Sales@ChipSourceTek.com Tony.Wang@ChipSourceTek.com Rev. P.2 – Apr., 2020 矽源特科技 ChipSourceTek
LTK5313 Characteristic curve test condition (TA=25℃) Description Test Conditions Serial No. Output Power VS THD+N RL=4Ω+33uH, Class D Fig.3 Output Power VS THD+N Efficiency VS Output Power RL=4Ω+33uH, Class AB Fig.4 VBAT=3.7V, RL=4Ω+33uH Fig.5 Input Voltage VS Maximum Output Powe RL=4Ω+33uH THD+N=10% Fig.6 Frequency Response VBAT=3.8V, RL=4Ω+33uH Fig.7 Frequency VS THD+N% VBAT=3.8V, RL=4Ω+33uH Po=1W Fig.8 TEL: +86-0755-27595155 27595165 FAX: +86-0755-27594792 WEB:Http://www.ChipSourceTek.com E-mail: Sales@ChipSourceTek.com Tony.Wang@ChipSourceTek.com Rev. P.2 – Apr., 2020 矽源特科技 ChipSourceTek
Fig.3 Output Power VS THD+N Fig.4 Output Power VS THD+N Fig.5 Efficiency VS Output Power Fig.6 Input Voltage VS Maximum Output Power Fig.7 Frequency Response Fig.8 Frequency VS THD+N% TEL: +86-0755-27595155 27595165 FAX: +86-0755-27594792 WEB:Http://www.ChipSourceTek.com E-mail: Sales@ChipSourceTek.com Tony.Wang@ChipSourceTek.com Rev. P.2 – Apr., 2020 矽源特科技 ChipSourceTek
LTK5313 has two modes of control: Software control (pulse control) & Hardware control (level control). Software control: Different rise edge of pulse controls different mode functions. 1st edge Class D AGC off； >20mS Hold High 2nd edge AGC1 (THD<6%) >20mS Hold High T=10uS 3rd edge AGC2 (THD<5%） >20mS Hold High T=10uS 4th edge AGC3 (THD<3%） >20mS Hold High T=10uS 5th edge AGC4 (THD<2%） >20mS Hold High T=10uS 6th edge Class AB mode >20mS Hold High T=10uS Hardware control： Different levels of EN controls Class AB & D functions TEL: +86-0755-27595155 27595165 FAX: +86-0755-27594792 WEB:Http://www.ChipSourceTek.com E-mail: Sales@ChipSourceTek.com Tony.Wang@ChipSourceTek.com Rev. P.2 – Apr., 2020 矽源特科技 ChipSourceTek
V(EN) Status <0.5V Shut Down 0.9V-1.3V Class AB mode 1.6V-2.1V Class D AGC On 2.5V-VDD Class D AGC Off Input Resistor, Rin The LTK5313’s input resistor is fixed, and the value is 20k, the input resistance have wide variation (+/ -5%) caused by manufacture. The gain can also be set by the external resistors Rin. The 6.5k is the internal input resistor, and the Ri n is the external input resistor . Different feedback resistor is set according to Class D or Class AB mode. For fully differential operating, The Ri n match is very important for CMRR, PSRR and harmonic distortion performance. It’s recommended use 1% tolerance resistor or better. Input Capacitor, Ci In the typical application an input capacitor, C i, is required to allow the amplifier to bias the input signal to the proper DC level for optimum operation. In this case, C i and the input impedance R i form a high-pass filter with the corner frequency determined in the follow equation: ii )C(highpass CR2 1f π= (3) The value of Ci is important to consider as it directly affects the low frequency performance of the circuit. Where Ri is 25kΩ (minimum) and the specification calls for a flat bass response down to 20Hz. Equation is reconfigured as follow: ci i fR2 1C π= (4) To consider input resistance variation, the C i is 0.1µF so one would likely choose a value in the range of 0.1µF to 0. 47uF. A further consideration for this capacitor is the leakage path from the input source through the input network (Ri + Rf, Ci) to the load. This leakage current creates a DC offset voltage at the input to the amplifier that reduces useful headroom, especially in high gain applications. For this reason, a low-leakage tantalum or ceramic capacitor is the best choice. When polarized capacitors are used, the positive side of the capacitor should face the amplifier input in most applications as the DC level there is held at VDD/2, which is likely higher that the source DC level. Please note that it is important to confirm the capacitor polarity in the application. Ferrite bead selection If the trace s form LTK5313 to speaker is short, the ferrite bead filters can reduce the high frequency radiated to meet the FCC & CE required. A ferrite that has very low impedance at low frequencies and high impedance at high frequencies (above 1 MHz) is recommended. Output Low-Pass Filter If the traces form LTK5313 to speaker are short, it doesn’t require output filter for FCC & CE standard. A ferrite bead may need if it ’s failing the test for FCC or CE tested without the LC filter. The figure 9 is the sample for added ferrite bead; the ferrite show choosing high impedance in high frequency. INRk kAv += 20 480 TEL: +86-0755-27595155 27595165 FAX: +86-0755-27594792 WEB:Http://www.ChipSourceTek.com E-mail: Sales@ChipSourceTek.com Tony.Wang@ChipSourceTek.com Rev. P.2 – Apr., 2020 矽源特科技 ChipSourceTek
Fig.9 Ferrite bead output filter Figures 10 and 11 are examples for added the LC filter (Butterworth), it’s recommended for the situation that the trace form amplifier to speaker is too long and need to eliminate the radiated emission or EMI. OUTP OUTN 8Ω 1µF 36µH 36µH 1µF Fig.10 LC output filter for 8Ω speaker OUTP OUTN 4Ω 2.2µF 18µH 18µH 2.2µF Fig.11 LC output filter for 4Ω speaker Fig.10 and 11’s low pass filter cut-off frequency are 25kHz (FC). LCπ2 1fC(lowpass) = (6) Power-Supply Decoupling Capacitor, CS The LTK5313 is a high-performance CMOS audio amplifier that requires adequate power supply decoupling to ensure the output total harmonic distortion (THD) is as low as possible. Power supply decoupling also prevents the oscillations causing by long lead length between the amplifier and the speaker. The optimum decoupling is achieved by using two different type capacitors that target on different type of noise on the power supply leads. For higher frequency transients, spikes, or digital hash on the line, a good low equivalent-series-resistance (ESR) ceramic capacitor, typically 0.1 µF placed as close as possible to the device VDD pin for works best. For filtering lower frequency noise signals, a large aluminum electrolytic capacitor of 10µF or greater placed near the audio power amplifier is recommended. TEL: +86-0755-27595155 27595165 FAX: +86-0755-27594792 WEB:Http://www.ChipSourceTek.com E-mail: Sales@ChipSourceTek.com Tony.Wang@ChipSourceTek.com Rev. P.2 – Apr., 2020 矽源特科技 ChipSourceTek
10Rev. P.2 – Apr., 2020 D θ2 E3 bA B C e GND PAD L Symbol Dimensions In Millimeters Dimensions In Inches Min Nom Max Min Nom Max e 1.270(BSC) 0.050(BSC) TEL: +86-0755-27595155 27595165 FAX: +86-0755-27594792 WEB:Http://www.ChipSourceTek.com E-mail: Sales@ChipSourceTek.com Tony.Wang@ChipSourceTek.com 矽源特科技 ChipSourceTek