Kingbor Technology Co.,Ltd KBA2338 TEL:(86)0755-26508846 FAX:(86)0755-26509052 3 W F ilte rle ss C la ss-D Audio P owe r Am plifie r General Description The kB2338A is a high efficiency, 3W mono class-D audio power amplifier. A low noise, filterless PWM architecture eliminates the output filter, reducing external component count, system cost, and simplifying design. Operating in a single 5V supply, kB2338A is capable of driving 4ȍ speaker load at a continuous average output of 3W/10% THD+N or 2W/1% THD+N. The kB2338A has high efficiency with speaker load compared to a typical class AB amplifier. With a 3.6V supply driving an 8ȍ speaker , the efficiency for a 400mW power level is 88%. In cellular handsets, the earpiece, speaker phone, and melody ringer can each be driven by the kB2338A. The gain of kB2338A is externally configurable which allows independent gain control from multiple sources by summing signals from seperate sources. The kB2338A is available in space-saving WCSP and DFN packages. MARKING DIAGRAMS A3 1 A1 1 8 PIN UDFN 2x2.2 Features z z z z z z z z z z z C1 • • • • 1 NC 2 7 INP 3 6 VP INM 4 5 OUTP Cellular Phone Portable Electronic Devices PDAs and Smart Phones Portable Computer Ordering Information Order Number Package Type Marking Operating Temperature range kBA2338B-UDFN UDFN-8 xxxx -40 °C to 85°C kBA2338-WCSP WCSP-9 A20 5 -40 °C to 85°C March 2007 1 OUTM SD Applications Unique Modulation Scheme Reduces EMI Emissions Efficiency at 3.6V With an 8-ȍ Speaker: í 88% at 400 mW í 80% at 100 mW Low 2.38-mA Quiescent Current and 0.5-µA Shutdown Current 2.5V to 6.0V Wide Supply Voltage Optimized PWM Output Stage Eliminates LC Output Filter Improved PSRR (í72 dB) Eliminates Need for a Voltage Regulator Fully Differential Design Reduces RF Rectification and Eliminates Bypass Capacitor Improved CMRR Eliminates Two Input Coupling Capacitors Internally Generated 250-kHz Switching Frequency Integrated Pop and Click Suppression Circuitry 1.5mm u 1.5mm Wafer Chip Scale Package (WCSP) and 3mm u 3mm DFN-8 package RoHS compliant and 100% lead(Pb)-free z A20 5 9ïPIN FLIPïCHIP WCSP 8 C3 8 GND Kingbor Technology Co.,Ltd KBA2338 TEL:(86)0755-26508846 FAX:(86)0755-26509052 Pin Configuration 9ïPin FlipïChip WCSP A3 B3 C3 OUTM GND OUTP A2 B2 C2 GND VP SD A1 B1 C1 VP (Top View) INM INP UDFN8 SD 1 8 OUTM NC 2 7 GND INP 3 6 VP INM 4 5 OUTP (Top View) BATTERY Cs Vp Ri Rf INM OUTP Data Processor Negative Differential Input Ri OUTM 300 k Gain= 300 k Ri Positive Differential Input CMOS Output Stage Rf INP RL = 8 RAMP GENERATOR Shutdown Control GND SD KBA2338 Vih Vil Figure 1. Typical Application Pin Description Pin No. WCSP UDFN8 Symbol Type Description A1 3 INP I Positive Differential Input. A2 7 GND I Analog Ground. A3 8 OUTM O Negative BTL Output. Vp I Analog Positive Supply. Range: 2.5 V – 6.0 V. B1 B2 6 Vp I Power Analog Positive Supply. Range: 2.5 V – 6.0 V. B3 7 GND I Analog Ground. C1 4 INM I Negative Differential Input. C2 1 SD I The device enters in Shutdown Mode when a low level is applied on this pin. An internal 300 k resistor will force the device in shutdown mode if no signal is applied to this pin. It also helps to save space and cost. C3 5 OUTP O Positive BTL Output. March 2007 2 Kingbor Technology Co.,Ltd KBA2338 TEL:(86)0755-26508846 FAX:(86)0755-26509052 Absolute Maximum Ratings Symbol Rating Vp Supply Voltage Vin Input Voltage Iout Max Output Current (Note 1) Pd Power Dissipation (Note 2) TA Operating Ambient Temperature TJ Max Junction Temperature Tstg Storage Temperature Range RJA Thermal Resistance JunctionïtoïAir ï ï ESD Protection Human Body Model (HBM) (Note 4) Machine Model (MM) (Note 5) ï Latchup Current @ TA = 85°C (Note 6) MSL Active Mode Shutdown Mode 9ïPin FlipïChip UDFN8 9ïPin FlipïChip UDFN8 Moisture Sensitivity (Note 7) Max Unit 6.0 7.0 V ï0.3 to VCC +0.3 V 1.5 A Internally Limited ï ï40 to +85 °C 150 °C ï65 to +150 °C 90 (Note 3) 50 °C/W > 2000 > 200 V $70 $100 mA Level 1 Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. 1. The device is protected by a current breaker structure. See “Current Breaker Circuit” in the Description Information section for more information. 2. The thermal shutdown is set to 160°C (typical) avoiding irreversible damage to the device due to power dissipation. 3. For the 9ïPin FlipïChip CSP package, the RJA is highly dependent of the PCB Heatsink area. For example, RJA can equal 195°C/W with 50 mm2 total area and also 135°C/W with 500 mm2. When using ground and power planes, the value is around 90°C/W, as specified in table. 4. Human Body Model: 100 pF discharged through a 1.5 k resistor following specification JESD22/A114. On 9ïPin FlipïChip, B2 Pin (VP) is qualified at 1500 V. 5. Machine Model: 200 pF discharged through all pins following specification JESD22/A115. 6. Latchup Testing per JEDEC Standard JESD78. 7. Moisture Sensitivity Level (MSL): 1 per IPC/JEDEC standard: JïSTDï020A. March 2007 3 Kingbor Technology Co.,Ltd KBA2338 TEL:(86)0755-26508846 FAX:(86)0755-26509052 Electrical Characteristics (Limits apply for TA = +25°C unless otherwise noted) (WCSP) Symbol Conditions Min Typ Max Unit Operating Supply Voltage Vp TA = ï40°C to +85°C 2.5 ï 6.0 V Supply Quiescent Current Idd Vp = 3.6 V, RL = 8.0 Vp = 5.5 V, No Load Vp from 2.5 V to 5.5 V, No Load TA = ï40°C to +85°C ï ï 2.15 2.61 ï ï mA ï ï 4.6 Vp = 4.2 V TA = +25°C TA = +85°C ï ï 0.42 0.45 0.8 ï Vp = 5.5 V TA = +25°C TA = +85°C ï ï 0.8 0.9 1.5 ï Characteristic Shutdown Current Isd A A Shutdown Voltage High Vsdih 1.2 ï ï V Shutdown Voltage Low Vsdil ï ï 0.4 V Switching Frequency Fsw Vp from 2.5 V to 5.5 V TA = ï40°C to +85°C 190 250 310 kHz G RL = 8.0 285 k Ri 300 k Ri 315 k Ri V V ZSD ï 300 ï Gain Output Impedance in Shutdown Mode Resistance from SD to GND Rs ï ï 300 ï k Output Offset Voltage Vos Vp = 5.5 V ï 6.0 ï mV Turn On Time Ton Vp from 2.5 V to 5.5 V ï 9.0 ï ms Turn Off Time Toff Vp from 2.5 V to 5.5 V ï 5.0 ï ms Thermal Shutdown Temperature Tsd ï ï 160 ï °C Output Noise Voltage Vn Vp = 3.6 V, f = 20 Hz to 20 kHz no weighting filter with A weighting filter ï ï 65 42 ï ï RL = 8.0 , f = 1.0 kHz, THD+N < 1% Vp = 2.5 V Vp = 3.0 V Vp = 3.6 V Vp = 4.2 V Vp = 5.0 V ï ï ï ï ï 0.32 0.48 0.7 0.97 1.38 ï ï ï ï ï RL = 8.0 , f = 1.0 kHz, THD+N < 10% Vp = 2.5 V Vp = 3.0 V Vp = 3.6 V Vp = 4.2 V Vp = 5.0 V ï ï ï ï ï 0.4 0.59 0.87 1.19 1.7 ï ï ï ï ï RL = 4.0 , f = 1.0 kHz, THD+N < 1% Vp = 2.5 V Vp = 3.0 V Vp = 3.6 V Vp = 4.2 V Vp = 5.0 V ï ï ï ï ï 0.49 0.72 1.06 1.62 2.12 ï ï ï ï ï RL = 4.0 , f = 1.0 kHz, THD+N < 10% Vp = 2.5 V Vp = 3.0 V Vp = 3.6 V Vp = 4.2 V Vp = 5.0 V ï ï ï ï ï 0.6 0.9 1.33 2.0 2.63 ï ï ï ï ï RMS Output Power March 2007 Po 4 Vrms W W W W Kingbor Technology Co.,Ltd KBA2338 TEL:(86)0755-26508846 FAX:(86)0755-26509052 Electrical Characteristics (Limits apply for TA = +25°C unless otherwise noted) (WCSP) Characteristic Efficiency Total Harmonic Distortion + Noise Common Mode Rejection Ratio Power Supply Rejection Ratio Symbol Conditions Min Typ Max ï RL = 8.0 , f = 1.0 kHz Vp = 5.0 V, Pout = 1.2 W Vp = 3.6 V, Pout = 0.6 W ï ï 91 90 ï ï RL = 4.0 , f = 1.0 kHz Vp = 5.0 V, Pout = 2.0 W Vp = 3.6 V, Pout = 1.0 W ï ï 82 81 ï ï ï 0.05 ï ï 0.09 ï ï ï62 ï ï ï ï56 ï57 ï ï Vp = 5.0 V, RL = 8.0 , f = 1.0 kHz, Pout = 0.25 W Vp = 3.6 V, RL = 8.0 , f = 1.0 kHz, Pout = 0.25 W THD+N CMRR PSRR Vp from 2.5 V to 5.5 V Vic = 0.5 V to Vp ï 0.8 V Vp = 3.6 V, Vic = 1.0 Vpp f = 217 Hz f = 1.0 kHz Vp_ripple_pkïpk = 200 mV, RL = 8.0 , Inputs AC Grounded Vp = 3.6 V f = 217 kHz f = 1.0 kHz Unit % % dB dB ï ï ï62 ï65 ï ï Conditions Min Typ Max Electrical Characteristics (Limits apply for TA = +25°C unless otherwise noted) (UDFN) Characteristic Symbol Unit Operating Supply Voltage Vp TA = ï40°C to +85°C 2.5 ï 6.0 V Supply Quiescent Current Idd Vp = 3.6 V, RL = 8.0 Vp = 5.5 V, No Load Vp from 2.5 V to 5.5 V, No Load TA = ï40°C to +85°C ï ï 2.15 2.61 ï ï mA ï ï 3.8 Vp = 4.2 V TA = +25°C TA = +85°C ï ï 0.42 0.45 0.8 2.0 Vp = 5.5 V TA = +25°C TA = +85°C ï ï 0.8 0.9 1.5 ï Shutdown Current Isd A A Shutdown Voltage High Vsdih 1.2 ï ï V Shutdown Voltage Low Vsdil ï ï 0.4 V Switching Frequency Fsw Vp from 2.5 V to 5.5 V TA = ï40°C to +85°C 180 240 300 kHz G RL = 8.0 285 k Ri 300 k Ri 315 k Ri V V Output Impedance in Shutdown Mode ZSD ï 20 ï k Resistance from SD to GND Rs ï ï 300 ï k Output Offset Voltage Vos Vp = 5.5 V ï 6.0 ï mV Turn On Time Ton Vp from 2.5 V to 5.5 V ï 1.0 ï s Turn Off Time Toff Vp from 2.5 V to 5.5 V ï 1.0 ï s Thermal Shutdown Temperature Tsd ï ï 160 ï Output Noise Voltage Vn Vp = 3.6 V, f = 20 Hz to 20 kHz no weighting filter with A weighting filter Gain March 2007 5 °C Vrms ï ï 65 42 ï ï Kingbor Technology Co.,Ltd KBA2338 TEL:(86)0755-26508846 FAX:(86)0755-26509052 Electrical Characteristics (Limits apply for TA = +25°C unless otherwise noted) (UDFN) Characteristic RMS Output Power Efficiency Total Harmonic Distortion + Noise Common Mode Rejection Ratio Power Supply Rejection Ratio March 2007 Symbol Conditions Min Typ Max Po RL = 8.0 , f = 1.0 kHz, THD+N < 1% Vp = 2.5 V Vp = 3.0 V Vp = 3.6 V Vp = 4.2 V Vp = 5.0 V ï ï ï ï ï 0.22 0.33 0.45 0.67 0.92 ï ï ï ï ï RL = 8.0 , f = 1.0 kHz, THD+N < 10% Vp = 2.5 V Vp = 3.0 V Vp = 3.6 V Vp = 4.2 V Vp = 5.0 V ï ï ï ï ï 0.36 0.53 0.76 1.07 1.49 ï ï ï ï ï RL = 4.0 , f = 1.0 kHz, THD+N < 1% Vp = 2.5 V Vp = 3.0 V Vp = 3.6 V Vp = 4.2 V Vp = 5.0 V ï ï ï ï ï 0.24 0.38 0.57 0.83 1.2 ï ï ï ï ï RL = 4.0 , f = 1.0 kHz, THD+N < 10% Vp = 2.5 V Vp = 3.0 V Vp = 3.6 V Vp = 4.2 V Vp = 5.0 V ï ï ï ï ï 0.52 0.8 1.125 1.58 2.19 ï ï ï ï ï RL = 8.0 , f = 1.0 kHz Vp = 5.0 V, Pout = 1.2 W Vp = 3.6 V, Pout = 0.6 W ï ï 87 87 ï ï RL = 4.0 , f = 1.0 kHz Vp = 5.0 V, Pout = 2.0 W Vp = 3.6 V, Pout = 1.0 W ï ï 79 78 ï ï ï 0.05 ï ï 0.06 ï ï ï62 ï ï ï ï56 ï57 ï ï ï THD+N Vp = 5.0 V, RL = 8.0 , f = 1.0 kHz, Pout = 0.25 W Vp = 3.6 V, RL = 8.0 , f = 1.0 kHz, Pout = 0.25 W CMRR PSRR Vp from 2.5 V to 5.5 V Vic = 0.5 V to Vp ï 0.8 V Vp = 3.6 V, Vic = 1.0 Vpp f = 217 Hz f = 1.0 kHz Vp_ripple_pkïpk = 200 mV, RL = 8.0 , Inputs AC Grounded Vp = 3.6 V f = 217 kHz f = 1.0 kHz 6 Unit W W W W % % dB dB ï ï ï62 ï65 ï ï Kingbor Technology Co.,Ltd KBA2338 TEL:(86)0755-26508846 FAX:(86)0755-26509052 Ci + Audio Input Signal KBA2338 Ri INP Ci ï + OUTM Load Ri INM OUTP VP 30 kHz Low Pass Filter Measurement Input ï GND 4.7 F + Power Supply ï Figure 2. Test Setup for Graphs NOTES: 1. Unless otherwise noted, Ci = 100 nF and Ri= 150 k. Thus, the gain setting is 2 V/V and the cutoff frequency of the input high pass filter is set to 10 Hz. Input capacitors are shorted for CMRR measurements. 2. To closely reproduce a real application case, all measurements are performed using the following loads: RL = 8 means Load = 15 H + 8 + 15 H RL = 4 means Load = 15 H + 4 + 15 H Very low DCR 15 H inductors (50 m) have been used for the following graphs. Thus, the electrical load measurements are performed on the resistor (8 or 4 ) in differential mode. 3. For Efficiency measurements, the optional 30 kHz filter is used. An RC lowïpass filter is selected with (100 , 47 nF) on each PWM output. March 2007 7 Kingbor Technology Co.,Ltd KBA2338 TEL:(86)0755-26508846 FAX:(86)0755-26509052 TYPICAL PERFORMANCE CHARACTERISTICS 100 100 kBA2338 WCSP EFFICIENCY (%) 80 90 DIE TEMPERATURE (°C) 90 kBA2338 DFN 70 60 50 40 Class AB 30 Vp = 5 V RL = 8 20 10 80 Class AB 70 Vp = 5 V RL = 8 60 50 40 30 0 kBA2338 20 0 0.2 0.4 0.6 Pout (W) 0.8 0 1 0.8 1.0 1.2 1.4 60 kBA2338 WCSP 80 55 DIE TEMPERATURE (°C) 90 EFFICIENCY (%) 0.6 Figure 4. Die Temperature vs. Pout Vp = 5 V, RL = 8 , f = 1 kHz @ TA = +25°C 100 kBA2338 DFN 70 60 50 40 Class AB 30 20 Vp = 3.6 V RL = 8 10 50 Class AB 45 Vp = 3.6 V RL = 8 40 35 30 25 kBA2338 20 0 0 0.1 0.2 0.3 0.4 Pout (W) 0.5 0.6 0 0.7 0.1 0.2 0.3 0.4 0.5 0.6 0.7 Pout (W) Figure 8. Die Temperature vs. P out Vp = 3.6 V, RL = 8 , f = 1 kHz @ TA = +25°C Figure 5. Efficiency vs. P out Vp = 3.6 V, RL = 8 , f = 1 kHz 90 160 kBA2338 WCSP 80 140 DIE TEMPERATURE (°C) kBA2338 DFN 70 EFFICIENCY % 0.4 Pout (W) Figure 3. Efficiency vs. Pout Vp = 5 V, RL = 8 , f = 1 kHz 60 50 40 Class AB 30 20 Vp = 5 V RL = 4 10 0 0.5 1 Class AB 120 100 Vp = 5 V RL = 4 80 60 40 0 1.5 2 Pout (W) kBA2338 20 0 0.5 1.0 Pout (W) 1.5 Figure 7. Die Temperature vs. Pout Vp = 5 V, RL = 4 , f = 1 kHz @ TA = +25°C Figure 6. Efficiency vs. Pout Vp = 5 V, RL = 4 , f = 1 kHz March 2007 0.2 8 2.0 Kingbor Technology Co.,Ltd KBA2338 TEL:(86)0755-26508846 FAX:(86)0755-26509052 TYPICAL PERFORMANCE CHARACTERISTICS 100 90 kBA2338 WCSP 80 DIE TEMPERATURE (°C) EFFICIENCY % 90 kBA2338 DFN 70 60 50 40 Class AB 30 Vp = 3.6 V RL = 4 20 10 Class AB 80 70 Vp = 3.6 V RL = 4 60 50 40 kBA2338 30 0 20 0 0.2 0.4 0.6 0.8 1 0 1.2 0.2 0.8 1.0 Pout (W) Figure 10. Die Temperature vs. Pout Vp = 3.6 V, RL = 4 , f = 1 kHz @ TA = +25°C Figure 9. Efficiency vs. Pout Vp = 3.6 V, RL = 4 , f = 1 kHz 10 10 Vp = 5.0 V RL = 8 f = 1 kHz 1.0 THD+N (%) THD+N (%) 0.6 0.4 Pout (W) kBA2338 DFN 1.0 Vp = 4.2 V RL = 8 f = 1 kHz kBA2338 DFN 0.1 0.1 kBA2338 WCSP kBA2338 WCSP 0.01 0 0.01 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 0.2 0.4 Pout (W) 1.0 1.2 Figure 12. THD+N vs. Pout Vp = 4.2 V, RL = 8 , f = 1 kHz 10 10 THD+N (%) Vp = 3.6 V RL = 8 f = 1 kHz 1.0 kBA2338 DFN 1.0 Vp = 3 V RL = 8 f = 1 kHz kBA2338 DFN 0.1 0.1 kBA2338 WCSP kBA2338 WCSP 0.01 0 0.01 0 0.2 0.4 0.6 0.8 Pout (W) 0.1 0.2 0.3 0.4 Pout (W) Figure 14. THD+N vs. Pout Vp = 3 V, RL = 8 , f = 1 kHz Figure 13. THD+N vs. Pout Vp = 3.6 V, RL = 8 , f = 1 kHz March 2007 0.8 Pout (W) Figure 11. THD+N vs. Pout Vp = 5 V, RL = 8 , f = 1 kHz THD+N (%) 0.6 9 0.5 0.6 Kingbor Technology Co.,Ltd KBA2338 TEL:(86)0755-26508846 FAX:(86)0755-26509052 TYPICAL PERFORMANCE CHARACTERISTICS 10 10 Vp = 5 V RL = 4 f = 1 kHz 1.0 THD+N (%) THD+N (%) Vp = 2.5 V RL = 8 f = 1 kHz kBA2338 DFN 0.1 0.01 0 kBA2338 WCSP 0.1 0.2 0.3 0.5 Figure 16. THD+N vs. Pout Vp = 5 V, RL = 4 , f = 1 kHz Vp = 4.2 V RL = 4 f = 1 kHz 1.0 Vp = 3.6 V RL = 4 f = 1 kHz 0.1 0.5 1.0 1.5 0.01 0 2.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 Pout (W) Figure 18. THD+N vs. Pout Vp = 3.6 V, RL = 4 , f = 1 kHz 10 10 Vp = 2.5 V RL = 4 f = 1 kHz THD+N (%) Vp = 3 V RL = 4 f = 1 kHz THD+N (%) 2.5 10 Figure 17. THD+N vs. Pout Vp = 4.2 V, RL = 4 , f = 1 kHz 1.0 0.2 0.4 0.6 0.8 1.0 Pout (W) 1.0 0.1 0 0.1 0.2 0.3 0.4 0.5 Pout (W) Figure 20. THD+N vs. Power Out Vp = 2.5 V, RL = 4 , f = 1 kHz Figure 19. THD+N vs. Power Out Vp = 3 V, RL = 4 , f = 1 kHz March 2007 2.0 Figure 15. THD+N vs. Pout Vp = 2.5 V, RL = 8 , f = 1 kHz Pout (W) 0.1 0 1.5 1.0 Pout (W) THD+N (%) THD+N (%) 0 Pout (W) 0.1 0.01 0 0.1 0.01 0.4 10 1.0 1.0 10 0.6 Kingbor Technology Co.,Ltd KBA2338 TEL:(86)0755-26508846 FAX:(86)0755-26509052 TYPICAL PERFORMANCE CHARACTERISTICS 2.0 3.0 RL = 8 f = 1 kHz kBA2338 DFN THD+N = 10% 2.0 kBA2338 WCSP THD+N = 10% 1.0 Pout (W) Pout (W) 1.5 RL = 4 f = 1 kHz 2.5 THD+N = 10% 1.5 THD+N = 1% 1.0 0.5 kBA2338 WCSP THD+N = 1% 3.0 3.5 4.0 4.5 0.5 0 2.5 5.0 3.0 3.5 4.0 4.5 5.0 POWER SUPPLY (V) POWER SUPPLY (V) Figure 21. Output Power vs. Power Supply RL = 8 @ f = 1 kHz Figure 22. Output Power vs. Power Supply RL = 4 @ f = 1 kHz 10 10 1.0 1.0 THD+N (%) THD+N (%) 0 2.5 kBA2338 DFN THD+N = 3% Vp = 2.5 V Vp = 3.6 V 0.1 Vp = 3.6 V Vp = 2.5 V 0.1 Vp = 5 V Vp = 5 V 100 1000 10000 0.01 10 100000 Figure 24. THD+N vs. Frequency RL = 4 , Pout = 250 mW @ f = 1 kHz ï30 ï30 ï40 ï40 Vp = 5 V Inputs to GND RL = 8 ï70 March 2007 100 1000 10000 100000 100000 Vp = 5 V ï50 ï60 Vp = 3.6 V ï80 10 10000 Figure 23. THD+N vs. Frequency RL = 8 , Pout = 250 mW @ f = 1 kHz ï20 ï60 1000 FREQUENCY (Hz) ï20 ï50 100 FREQUENCY (Hz) PSSR (dB) PSSR (dB) 0.01 10 Vp = 3.6 V Inputs to GND RL = 4 ï70 ï80 10 100 1000 10000 100000 FREQUENCY (Hz) FREQUENCY (Hz) Figure 25. PSRR vs. Frequency Inputs Grounded, RL = 8 , Vripple = 200 mvpkpk Figure 26. PSRR vs. Frequency Inputs grounded, RL = 4 , Vripple = 200 mVpkpk 11 Kingbor Technology Co.,Ltd KBA2338 TEL:(86)0755-26508846 FAX:(86)0755-26509052 ï20 3.5 ï30 3.0 QUIESCENT CURRENT (mA) CMMR (dB) TYPICAL PERFORMANCE CHARACTERISTICS ï40 ï50 ï60 Vp = 3.6 V RL = 8 ï70 ï80 10 100 1000 10000 2.5 2.0 Thermal Shutdown Vp = 3.6 V RL = 8 1.5 1.0 0.5 0 120 100000 130 FREQUENCY (Hz) 2.8 RL = 8 800 SHUTDOWN CURRENT (nA) SHUTDOWN CURRENT (nA) 160 Figure 28. Thermal Shutdown vs. Temperature Vp = 5 V, RL = 8 , 900 700 600 500 400 300 200 RL = 8 2.6 2.4 2.2 2.0 1.8 1.6 1.4 1.2 100 0 2.5 3.5 4.5 1.0 2.5 5.5 3.5 4.5 5.5 POWER SUPPLY (V) POWER SUPPLY (V) Figure 29. Shutdown Current vs. Power Supply RL = 8 Figure 30. Quiescent Current vs. Power Supply RL = 8 1000 1000 Vp = 5 V RL = 8 100 NOISE (Vrms) Vp = 3.6 V RL = 8 No Weighting 100 No Weighting With A Weighting 10 10 100 1000 With A Weighting 10000 FREQUENCY (Hz) 10 10 100 1000 10000 FREQUENCY (Hz) Figure 32. Noise Floor, Inputs AC Grounded with 1 F Vp = 5 V Figure 31. Noise Floor, Inputs AC Grounded with 1 F Vp = 3.6 V March 2007 150 TEMPERATURE (°C) Figure 27. PSRR vs. Frequency Vp = 3.6 V, RL = 8 , Vic = 200 mvpkpk NOISE (Vrms) 140 12 Kingbor Technology Co.,Ltd KBA2338 TEL:(86)0755-26508846 FAX:(86)0755-26509052 11 8 TURN OFF TIME (mS) TURN ON TIME (mS) TA = +85°C 10 TA = +25°C 9 TA = ï40°C 8 7 TA = +25°C TA = ï40°C 6 5 TA = +85°C 7 6 2.5 3.5 4.5 5.5 4 2.5 3.5 4.5 POWER SUPPLY (V) POWER SUPPLY (V) Figure 33. Turn on Time Figure 34. Turn off Time 5.5 Description Information Detailed Description The basic structure of the Kba2338 is composed of one analog preïamplifier, a pulse width modulator and an Hïbridge CMOS power stage. The first stage is externally configurable with gainïsetting resistor Ri and the internal fixed feedback resistor Rf (the closedïloop gain is fixed by the ratios of these resistors) and the other stage is fixed. The load is driven differentially through two output stages. The differential PWM output signal is a digital image of the analog audio input signal. The human ear is a band pass filter regarding acoustic waveforms, the typical values of which are 20 Hz and 20 kHz. Thus, the user will hear only the amplified audio input signal within the frequency range. The switching frequency and its harmonics are fully filtered. The inductive parasitic element of the loudspeaker helps to guarantee a superior distortion value. The device has the same behavior when it is turnedïoff by a logic low on the shutdown pin. No power is delivered to the load 5 ms after a falling edge on the shutdown pin. Due to the fast turn on and off times, the shutdown signal can be used as a mute signal as well. Turn On and Turn Off Transitions in Case of UDFN8 In case of UDFN8 package, the audio signal is established instantaneously after the rising edge on the shutdown pin. The audio is also suddenly cut once a low level is sent to the amplifier. This way to turn on and off the device in a very fast way also prevents from “pop & click” noise. Shutdown Function The device enters shutdown mode when the shutdown signal is low. During the shutdown mode, the DC quiescent current of the circuit does not exceed 1.5 A. Power Amplifier Current Breaker Circuit The output PMOS and NMOS transistors of the amplifier have been designed to deliver the output power of the specifications without clipping. The channel resistance (Ron) of the NMOS and PMOS transistors is typically 0.4. The maximum output power of the circuit corresponds to an average current in the load of 820 mA. In order to limit the excessive power dissipation in the load if a shortïcircuit occurs, a current breaker cell shuts down the output stage. The current in the four output MOS transistors are realïtime controlled, and if one current exceeds the threshold set to 1.5 A, the MOS transistor is opened and the current is reduced to zero. As soon as the shortïcircuit is removed, the circuit is able to deliver the expected output power. This patented structure protects the Kba2338. Since it completely turns off the load, it minimizes the risk of the chip overheating which could occur if a soft current limiting circuit was used. Turn On and Turn Off Transitions in Case of 9 Pin FlipïChip Package In order to eliminate “pop and click” noises during transition, the output power in the load must not be established or cutoff suddenly. When a logic high is applied to the shutdown pin, the internal biasing voltage rises quickly and, 4 ms later, once the output DC level is around the common mode voltage, the gain is established slowly (5.0 ms). This method to turn on the device is optimized in terms of rejection of “pop and click” noises. Thus, the total turn on time to get full power to the load is 9 ms (typical). March 2007 13 Kingbor Technology Co.,Ltd KBA2338 TEL:(86)0755-26508846 FAX:(86)0755-26509052 RL = 8 15 H OUTM 1.0 F OUTP 15 H Optional Audio Output Filter L1 P1 FB C3 4.7µF P3 R1 C3 1uF AUDIO IN A1 150K C1 0.1uF C2 1uF R2 150K A2 P2 A3 INP GND OUTN B1 B2 B3 VDDA VDD1 GND C1 C2 C3 INN SDB OUTP VCC GND L2 FB C4 1nF L3 C5 1nF SP1 SPEAKER FB KBA2338 Normal Shutdown SW1 Ferrite Bead specification: Z=120 ȍ @100MHz , Current rating=3A kBA2338 WCSP Application Schematic March 2007 14 Kingbor Technology Co.,Ltd KBA2338 TEL:(86)0755-26508846 FAX:(86)0755-26509052 PACAGE DESCRIPTION 9 PIN WCSP ïAï 4X D 0.10 C ïBï DIM A A1 A2 D E b e D1 E1 E TOP VIEW A 0.10 C 0.05 C ïCï A2 A1 SIDE VIEW SEATING PLANE D1 e C B e E1 A 9X b 1 2 3 0.05 C A B 0.03 C March 2007 BOTTOM VIEW 15 MILLIMETERS MIN MAX 0.540 0.660 0.210 0.270 0.330 0.390 1.450 BSC 1.450 BSC 0.290 0.340 0.500 BSC 1.000 BSC 1.000 BSC Kingbor Technology Co.,Ltd KBA2338 TEL:(86)0755-26508846 FAX:(86)0755-26509052 PACAGE DESCRIPTION 8 PIN UDFN, 2x2.2, 0.5P A B D PIN ONE REFERENCE 2X 0.10 C ÉÉ ÉÉ ÉÉ E DIM A A1 A3 b D D2 E E2 e K L TOP VIEW 0.10 C 2X A (A3) 0.10 C 8X 0.08 C SEATING PLANE SIDE VIEW MILLIMETERS MIN NOM MAX 0.45 0.50 0.55 0.00 0.03 0.05 0.127 REF 0.20 0.25 0.30 2.00 BSC 1.40 1.50 1.60 2.20 BSC 0.70 0.80 0.90 0.50 BSC 0.20 ïïï ïïï 0.35 0.40 0.45 C A1 SOLDERING FOOTPRINT* D2 8X L 4 1 2.15 e 1 E2 8X K 8 5 BOTTOM VIEW 1.60 8X b 0.10 C A B 0.05 C Kingbor Technology TEL:(86)0755-26508846 FAX:(86)0755-26509052 www.kingbor.com NOTE 3 16 ÇÇ ÇÇ ÇÇ ÇÇ ÇÇ ÇÇ ÇÇÇ ÇÇÇ ÇÇÇ ÇÇÇ ÇÇÇ ÇÇÇ 8X 0.48 0.80 8X 0.25 0.50 PITCH DIMENSIONS: MILLIMETERS March 2007