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KBA2338
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 4 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 8 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
C3
1 9 PIN FLIP CHIP WCSP
A1
A20 5
C1
8 1 8 PIN UDFN 2x2.2
SD NC INP INM
1 2 3 4
8 7 6 5
OUTM GND VP OUTP
Features
Unique Modulation Scheme Reduces EMI Emissions Efficiency at 3.6V With an 8- Speaker: 88% at 400 mW 80% at 100 mW Low 2.38-mA Quiescent Current and 0.5-A Shutdown Current 2.5V to 6.0V Wide Supply Voltage Optimized PWM Output Stage Eliminates LC Output Filter Improved PSRR ( 72 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 1.5mm Wafer Chip Scale Package (WCSP) and 3mm 3mm DFN-8 package RoHS compliant and 100% lead(Pb)-free
Applications
* * * *
Cellular Phone Portable Electronic Devices PDAs and Smart Phones Portable Computer
Ordering Information
Order Number kBA2338B-UDFN KBA2338-WCSP Package Type UDFN-8 WCSP-9 Marking xxxx A20 5 Operating Temperature range -40 C to 85C -40 C to 85C
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KBA2338
UDFN8
SD NC INP INM
Pin Configuration
9 Pin Flip Chip WCSP
A3 OUTM A2 GND A1 INP B3 GND B2 VP B1 VP (Top View) C3 OUTP C2 SD C1 INM BATTERY Cs
1 2 3 4
(Top View)
8 7 6 5
OUTM GND VP OUTP
Vp
Ri
INM
Rf OUTP RAMP GENERATOR
Negative Differential Input Ri INP Rf
Data Processor
CMOS Output Stage
OUTM
300 kW Positive Differential Input Gain= 300 kW Ri Vih SD
Shutdown Control
GND
KBA2338
Vil
Figure 1. Typical Application
Pin Description
Pin No. WCSP UDFN8 A1 A2 A3 B1 B2 B3 C1 C2 6 7 4 1 3 7 8 Symbol INP GND OUTM Vp Vp GND INM SD Type I I O I I I I I Positive Differential Input. Analog Ground. Negative BTL Output. Analog Positive Supply. Range: 2.5 V - 6.0 V. Power Analog Positive Supply. Range: 2.5 V - 6.0 V. Analog Ground. Negative Differential Input. The device enters in Shutdown Mode when a low level is applied on this pin. An internal 300 kW resistor will force the device in shutdown mode if no signal is applied to this pin. It also helps to save space and cost. Positive BTL Output. Description
C3
5
OUTP
O
March 2007
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RL = 8 W
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KBA2338
Max Active Mode Shutdown Mode 6.0 7.0 0.3 to VCC +0.3 1.5 Internally Limited 40 to +85 150 65 to +150 9 Pin Flip Chip UDFN8 90 (Note 3) 50 > 2000 > 200 9 Pin Flip Chip UDFN8 $70 $100 Level 1 C C C C/W Unit V V A
Absolute Maximum Ratings
Symbol Vp Vin Iout Pd TA TJ Tstg RqJA Supply Voltage Input Voltage Max Output Current (Note 1) Power Dissipation (Note 2) Operating Ambient Temperature Max Junction Temperature Storage Temperature Range Thermal Resistance Junction to Air ESD Protection Human Body Model (HBM) (Note 4) Machine Model (MM) (Note 5) Latchup Current @ TA = 85C (Note 6) MSL Moisture Sensitivity (Note 7) Rating
V
mA
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 160C (typical) avoiding irreversible damage to the device due to power dissipation. 3. For the 9 Pin Flip Chip CSP package, the RqJA is highly dependent of the PCB Heatsink area. For example, RqJA can equal 195C/W with 50 mm2 total area and also 135C/W with 500 mm2. When using ground and power planes, the value is around 90C/W, as specified in table. 4. Human Body Model: 100 pF discharged through a 1.5 kW resistor following specification JESD22/A114. On 9 Pin Flip Chip, 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: J STD 020A.
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KBA2338
Conditions TA = 40C to +85C Min 2.5 2.15 2.61 4.6 mA 0.42 0.45 0.8 0.9 1.2 0.4 190 285 kW Ri 250 300 kW Ri 300 300 Vp = 5.5 V 6.0 9.0 5.0 160 310 315 kW Ri 0.8 mA 1.5 V V kHz V V W kW mV ms ms C mVrms 65 42 W 0.32 0.48 0.7 0.97 1.38 W 0.4 0.59 0.87 1.19 1.7 W 0.49 0.72 1.06 1.62 2.12 W 0.6 0.9 1.33 2.0 2.63 Typ Max 6.0 Unit V mA
Electrical Characteristics
(Limits apply for TA = +25C unless otherwise noted) (WCSP) Characteristic Operating Supply Voltage Supply Quiescent Current Symbol Vp Idd
Vp = 3.6 V, RL = 8.0 W Vp = 5.5 V, No Load Vp from 2.5 V to 5.5 V, No Load TA = 40C to +85C Vp = 4.2 V TA = +25C TA = +85C Vp = 5.5 V TA = +25C TA = +85C
Shutdown Current
Isd
Shutdown Voltage High Shutdown Voltage Low Switching Frequency Gain Output Impedance in Shutdown Mode Resistance from SD to GND Output Offset Voltage Turn On Time Turn Off Time Thermal Shutdown Temperature Output Noise Voltage
Vsdih Vsdil Fsw G ZSD Rs Vos Ton Toff Tsd Vn
Vp from 2.5 V to 5.5 V TA = 40C to +85C RL = 8.0 W -
Vp from 2.5 V to 5.5 V Vp from 2.5 V to 5.5 V
Vp = 3.6 V, f = 20 Hz to 20 kHz no weighting filter with A weighting filter RL = 8.0 W, 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 RL = 8.0 W, 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 RL = 4.0 W, 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 RL = 4.0 W, 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
RMS Output Power
Po
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KBA2338
Conditions Min Typ 91 90 82 81 % 0.05 0.09 dB 62 56 57 dB Max Unit %
Electrical Characteristics
(Limits apply for TA = +25C unless otherwise noted) (WCSP) Characteristic Efficiency Symbol RL = 8.0 W, f = 1.0 kHz Vp = 5.0 V, Pout = 1.2 W Vp = 3.6 V, Pout = 0.6 W RL = 4.0 W, f = 1.0 kHz Vp = 5.0 V, Pout = 2.0 W Vp = 3.6 V, Pout = 1.0 W Total Harmonic Distortion + Noise THD+N Vp = 5.0 V, RL = 8.0 W, f = 1.0 kHz, Pout = 0.25 W Vp = 3.6 V, RL = 8.0 W, f = 1.0 kHz, Pout = 0.25 W Vp from 2.5 V to 5.5 V Vic = 0.5 V to Vp 0.8 V Vp = 3.6 V, Vic = 1.0 Vpp f = 217 Hz f = 1.0 kHz Vp_ripple_pk pk = 200 mV, RL = 8.0 W, Inputs AC Grounded Vp = 3.6 V f = 217 kHz f = 1.0 kHz
Common Mode Rejection Ratio
CMRR
Power Supply Rejection Ratio
PSRR
62 65
Electrical Characteristics
(Limits apply for TA = +25C unless otherwise noted) (UDFN) Characteristic Operating Supply Voltage Supply Quiescent Current Symbol Vp Idd Conditions TA = 40C to +85C Vp = 3.6 V, RL = 8.0 W Vp = 5.5 V, No Load Vp from 2.5 V to 5.5 V, No Load TA = 40C to +85C Vp = 4.2 V TA = +25C TA = +85C Vp = 5.5 V TA = +25C TA = +85C Shutdown Voltage High Shutdown Voltage Low Switching Frequency Gain Output Impedance in Shutdown Mode Resistance from SD to GND Output Offset Voltage Turn On Time Turn Off Time Thermal Shutdown Temperature Output Noise Voltage Vsdih Vsdil Fsw G ZSD Rs Vos Ton Toff Tsd Vn Vp = 3.6 V, f = 20 Hz to 20 kHz no weighting filter with A weighting filter Vp = 5.5 V Vp from 2.5 V to 5.5 V Vp from 2.5 V to 5.5 V Vp from 2.5 V to 5.5 V TA = 40C to +85C RL = 8.0 W 180 285 kW Ri 240 300 kW Ri 20 300 6.0 1.0 1.0 160 65 42 1.2 0.4 300 315 kW Ri Min 2.5 2.15 2.61 3.8 mA 0.42 0.45 0.8 0.9 0.8 2.0 mA 1.5 V V kHz V V kW kW mV ms ms C mVrms Typ Max 6.0 Unit V mA
Shutdown Current
Isd
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KBA2338
Conditions Min Typ 0.22 0.33 0.45 0.67 0.92 W 0.36 0.53 0.76 1.07 1.49 W 0.24 0.38 0.57 0.83 1.2 W 0.52 0.8 1.125 1.58 2.19 % 87 87 79 78 % 0.05 0.06 dB 62 56 57 dB Max Unit W
Electrical Characteristics
(Limits apply for TA = +25C unless otherwise noted) (UDFN) Characteristic RMS Output Power Symbol Po RL = 8.0 W, 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 RL = 8.0 W, 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 RL = 4.0 W, 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 RL = 4.0 W, 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 Efficiency RL = 8.0 W, f = 1.0 kHz Vp = 5.0 V, Pout = 1.2 W Vp = 3.6 V, Pout = 0.6 W RL = 4.0 W, f = 1.0 kHz Vp = 5.0 V, Pout = 2.0 W Vp = 3.6 V, Pout = 1.0 W Total Harmonic Distortion + Noise THD+N Vp = 5.0 V, RL = 8.0 W, f = 1.0 kHz, Pout = 0.25 W Vp = 3.6 V, RL = 8.0 W, f = 1.0 kHz, Pout = 0.25 W Vp from 2.5 V to 5.5 V Vic = 0.5 V to Vp 0.8 V Vp = 3.6 V, Vic = 1.0 Vpp f = 217 Hz f = 1.0 kHz Vp_ripple_pk pk = 200 mV, RL = 8.0 W, Inputs AC Grounded Vp = 3.6 V f = 217 kHz f = 1.0 kHz
Common Mode Rejection Ratio
CMRR
Power Supply Rejection Ratio
PSRR
62 65
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KBA2338
Ci + Audio Input Signal
Ri INP
KBA2338
OUTM Load 30 kHz Low Pass Filter + Measurement Input
Ci
Ri INM VP OUTP GND
4.7 mF + Power Supply
Figure 2. Test Setup for Graphs
NOTES: 1. Unless otherwise noted, Ci = 100 nF and Ri= 150 kW. 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 W means Load = 15 mH + 8 W + 15 mH RL = 4 W means Load = 15 mH + 4 W + 15 mH Very low DCR 15 mH inductors (50 mW) have been used for the following graphs. Thus, the electrical load measurements are performed on the resistor (8 W or 4 W) in differential mode. 3. For Efficiency measurements, the optional 30 kHz filter is used. An RC low pass filter is selected with (100 W, 47 nF) on each PWM output.
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KBA2338
TYPICAL PERFORMANCE CHARACTERISTICS
100 90 80 EFFICIENCY (%) 70 60 50 40 30 20 10 0 0 0.2 0.4 0.6 Pout (W) 0.8 1 Class AB Vp = 5 V RL = 8 W kBA2338 WCSP kBA2338 mDFN DIE TEMPERATURE (C) 100 90 80 70 60 50 40 30 20 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 Pout (W) kBA2338 Vp = 5 V RL = 8 W Class AB
Figure 3. Efficiency vs. Pout Vp = 5 V, RL = 8 W, f = 1 kHz
100 90 80 EFFICIENCY (%) 70 60 50 40 30 20 10 0 0 0.1 0.2 0.3 0.4 Pout (W) 0.5 0.6 0.7 Vp = 3.6 V RL = 8 W Class AB kBA2338 WCSP kBA2338 mDFN DIE TEMPERATURE (C) 60 55 50 45 40 35 30 25 20 0
Figure 4. Die Temperature vs. Pout Vp = 5 V, RL = 8 W, f = 1 kHz @ TA = +25C
Class AB
Vp = 3.6 V RL = 8 W
kBA2338 0.1 0.2 0.3 0.4 0.5 0.6 0.7
Pout (W)
Figure 5. Efficiency vs. P out Vp = 3.6 V, RL = 8 W, f = 1 kHz
90 80 70 EFFICIENCY % 60 50 40 30 20 10 0 0 0.5 1 Pout (W) 1.5 2 Vp = 5 V RL = 4 W Class AB kBA2338 WCSP DIE TEMPERATURE (C) kBA2338 mDFN 140 120 100 80 60 40 20 0 160
Figure 8. Die Temperature vs. P out Vp = 3.6 V, RL = 8 W, f = 1 kHz @ TA = +25C
Class AB
Vp = 5 V RL = 4 W
kBA2338
0.5
1.0 Pout (W)
1.5
2.0
Figure 6. Efficiency vs. Pout Vp = 5 V, RL = 4 W, f = 1 kHz
Figure 7. Die Temperature vs. Pout Vp = 5 V, RL = 4 W, f = 1 kHz @ TA = +25C
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KBA2338
100
TYPICAL PERFORMANCE CHARACTERISTICS
90 80 70 EFFICIENCY % 60 50 40 30 20 10 0 0 0.2 0.4 0.6 Pout (W) 0.8 1 1.2 Vp = 3.6 V RL = 4 W Class AB kBA2338 WCSP DIE TEMPERATURE (C) kBA2338 mDFN
90 80 70 60 50 40 kBA2338 30 20 0 0.2 0.4 0.6 Pout (W) 0.8 1.0 Vp = 3.6 V RL = 4 W Class AB
Figure 9. Efficiency vs. Pout Vp = 3.6 V, RL = 4 W, f = 1 kHz
10 Vp = 5.0 V RL = 8 W f = 1 kHz THD+N (%) 10
Figure 10. Die Temperature vs. Pout Vp = 3.6 V, RL = 4 W, f = 1 kHz @ TA = +25C
THD+N (%)
1.0
1.0
Vp = 4.2 V RL = 8 W f = 1 kHz
kBA2338 mDFN 0.1 kBA2338 WCSP
kBA2338 mDFN 0.1 kBA2338 WCSP
0.01 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 Pout (W)
0.01 0
0.2
0.4
0.6 Pout (W)
0.8
1.0
1.2
Figure 11. THD+N vs. Pout Vp = 5 V, RL = 8 W, f = 1 kHz
10 Vp = 3.6 V RL = 8 W f = 1 kHz kBA2338 mDFN 0.1 kBA2338 WCSP THD+N (%) 10
Figure 12. THD+N vs. Pout Vp = 4.2 V, RL = 8 W, f = 1 kHz
THD+N (%)
1.0
1.0
Vp = 3 V RL = 8 W f = 1 kHz kBA2338 mDFN
0.1
kBA2338 WCSP
0.01 0 0.2 0.4 Pout (W) 0.6 0.8
0.01 0
0.1
0.2
0.3 Pout (W)
0.4
0.5
0.6
Figure 13. THD+N vs. Pout Vp = 3.6 V, RL = 8 W, f = 1 kHz
Figure 14. THD+N vs. Pout Vp = 3 V, RL = 8 W, f = 1 kHz
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KBA2338
10
TYPICAL PERFORMANCE CHARACTERISTICS
10 Vp = 2.5 V RL = 8 W f = 1 kHz THD+N (%) 1.0 kBA2338 mDFN THD+N (%) 1.0
Vp = 5 V RL = 4 W f = 1 kHz
0.1
kBA2338 WCSP
0.1
0.01 0
0.1
0.2 Pout (W)
0.3
0.4
0.01
0
0.5
1.0
1.5 Pout (W)
2.0
2.5
Figure 15. THD+N vs. Pout Vp = 2.5 V, RL = 8 W, f = 1 kHz
10 Vp = 4.2 V RL = 4 W f = 1 kHz THD+N (%) 10
Figure 16. THD+N vs. Pout Vp = 5 V, RL = 4 W, f = 1 kHz
THD+N (%)
1.0
1.0
Vp = 3.6 V RL = 4 W f = 1 kHz
0.1
0.1
0.01 0
0.5
1.0 Pout (W)
1.5
2.0
0.01 0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
Pout (W)
Figure 17. THD+N vs. Pout Vp = 4.2 V, RL = 4 W, f = 1 kHz
10 Vp = 3 V RL = 4 W f = 1 kHz THD+N (%) THD+N (%) 10
Figure 18. THD+N vs. Pout Vp = 3.6 V, RL = 4 W, f = 1 kHz
Vp = 2.5 V RL = 4 W f = 1 kHz
1.0
1.0
0.1 0
0.2
0.4 Pout (W)
0.6
0.8
1.0
0.1 0
0.1
0.2
0.3 Pout (W)
0.4
0.5
0.6
Figure 19. THD+N vs. Power Out Vp = 3 V, RL = 4 W, f = 1 kHz
Figure 20. THD+N vs. Power Out Vp = 2.5 V, RL = 4 W, f = 1 kHz
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KBA2338
3.0
TYPICAL PERFORMANCE CHARACTERISTICS
2.0 RL = 8 W f = 1 kHz 1.5 Pout (W) kBA2338 WCSP THD+N = 10% RL = 4 W f = 1 kHz
kBA2338 mDFN THD+N = 10% Pout (W)
2.5 2.0 1.5 1.0
THD+N = 10%
1.0
THD+N = 1%
0.5 kBA2338 WCSP THD+N = 1% 0 2.5 3.0 3.5 4.0
kBA2338 mDFN THD+N = 3%
0.5 0 2.5
4.5
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 W @ f = 1 kHz
10 10
Figure 22. Output Power vs. Power Supply RL = 4 W @ f = 1 kHz
THD+N (%)
THD+N (%)
1.0 Vp = 2.5 V 0.1 Vp = 3.6 V Vp = 5 V
1.0 Vp = 2.5 V 0.1 Vp = 5 V Vp = 3.6 V
0.01 10
100
1000 FREQUENCY (Hz)
10000
100000
0.01 10
100
1000 FREQUENCY (Hz)
10000
100000
Figure 23. THD+N vs. Frequency RL = 8 W, Pout = 250 mW @ f = 1 kHz
20 30 40 50 60 70 80 10 Vp = 5 V 20 30 40 50 60 Inputs to GND RL = 8 W 100 1000 FREQUENCY (Hz) 10000 100000 70 80 10
Figure 24. THD+N vs. Frequency RL = 4 W, Pout = 250 mW @ f = 1 kHz
PSSR (dB)
PSSR (dB)
Vp = 5 V
Vp = 3.6 V
Vp = 3.6 V Inputs to GND RL = 4 W 100 1000 FREQUENCY (Hz) 10000 100000
Figure 25. PSRR vs. Frequency Inputs Grounded, RL = 8 W, Vripple = 200 mvpkpk
Figure 26. PSRR vs. Frequency Inputs grounded, RL = 4 W, Vripple = 200 mVpkpk
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KBA2338
TYPICAL PERFORMANCE CHARACTERISTICS
20 30 40 50 60 70 80 10 Vp = 3.6 V RL = 8 W QUIESCENT CURRENT (mA) 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 120 130 140 TEMPERATURE (C) 150 160 Thermal Shutdown Vp = 3.6 V RL = 8 W
CMMR (dB)
100
1000 FREQUENCY (Hz)
10000
100000
Figure 27. PSRR vs. Frequency Vp = 3.6 V, RL = 8 W, Vic = 200 mvpkpk
900 SHUTDOWN CURRENT (nA) SHUTDOWN CURRENT (nA) 800 700 600 500 400 300 200 100 0 2.5 3.5 4.5 5.5 RL = 8 W 2.8 2.6 2.4 2.2 2.0 1.8 1.6 1.4 1.2
Figure 28. Thermal Shutdown vs. Temperature Vp = 5 V, RL = 8 W,
RL = 8 W
1.0 2.5
3.5
4.5
5.5
POWER SUPPLY (V)
POWER SUPPLY (V)
Figure 29. Shutdown Current vs. Power Supply RL = 8 W
1000 Vp = 3.6 V RL = 8 W NOISE (mVrms) NOISE (mVrms) 1000
Figure 30. Quiescent Current vs. Power Supply RL = 8 W
Vp = 5 V RL = 8 W
100
No Weighting
100
No Weighting
With A Weighting
With A Weighting
10 10
100
1000
10000
10 10
100
1000
10000
FREQUENCY (Hz)
FREQUENCY (Hz)
Figure 31. Noise Floor, Inputs AC Grounded with 1 mF Vp = 3.6 V
Figure 32. Noise Floor, Inputs AC Grounded with 1 mF Vp = 5 V
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KBA2338
8 TURN OFF TIME (mS) 7 TA = +25C 6 TA = +85C TA = 40C
11 TA = +85C TURN ON TIME (mS) 10 TA = +25C 9 TA = 40C 8
5
7 6 2.5
3.5
4.5
5.5
4 2.5
3.5
4.5
5.5
POWER SUPPLY (V)
POWER SUPPLY (V)
Figure 33. Turn on Time
Figure 34. Turn off Time
Description Information
Detailed Description The basic structure of the Kba2338 is composed of one analog pre amplifier, a pulse width modulator and an H bridge CMOS power stage. The first stage is externally configurable with gain setting resistor Ri and the internal fixed feedback resistor Rf (the closed loop 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.
Power Amplifier
The device has the same behavior when it is turned off 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 mA.
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 W.
Turn On and Turn Off Transitions in Case of 9 Pin Flip Chip 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).
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 short circuit occurs, a current breaker cell shuts down the output stage. The current in the four output MOS transistors are real time 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 short circuit 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.
March 2007
13
Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
KBA2338
OUTM
15 mH RL = 8 W
1.0 mF OUTP 15 mH
Optional Audio Output Filter
L1 C3 4.7F FB
P1
VCC
P2
GND
P3 AUDIO IN
C3 1uF C1 0.1uF C2 1uF
R1 150K
INP
A1 B1
GND
A2
OUTN
A3
L2 FB C4 1nF C5 1nF SP1
VDDA
VDD1
B2
GND
B3
R2 150K
Normal Shutdown
INN
C1
SDB
C2
OUTP
C3
L3 FB
SPEAKER
KBA2338
SW1
Ferrite Bead specification: Z=120 @100MHz , Current rating=3A
kBA2338 WCSP Application Schematic
March 2007
14
Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
KBA2338
PACAGE DESCRIPTION
9 PIN WCSP
4X
A D B E
DIM A A1 A2 D E b e D1 E1 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
0.10 C
TOP VIEW 0.10 C 0.05 C C
SEATING PLANE
A
A2 A1 SIDE VIEW D1 e
C B
e
A 9X
E1
b
1
2
3
0.05 C A B 0.03 C BOTTOM VIEW
March 2007
15
Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
KBA2338
PACAGE DESCRIPTION
8 PIN UDFN, 2x2.2, 0.5P
D
AB
PIN ONE REFERENCE 2X
E
DIM A A1 A3 b D D2 E E2 e K L 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 0.35 0.40 0.45
0.10 C
2X
0.10 C 0.10 C
8X
0.08 C
8X
L
1
E2 1.60 0.10 C A B 0.05 C
NOTE 3
8X
K
8
5
8X b
BOTTOM VIEW
0.80
Kingbor Technology
TEL:(86)0755-26508846 FAX:(86)0755-26509052 www.kingbor.com
16
CCC CCC CCC CCC CCC CCC
CC CC CC CC CC CC
EE EE EE
1
TOP VIEW (A3) A
SIDE VIEW A1 D2 4 e C
SEATING PLANE
SOLDERING FOOTPRINT*
2.15
8X
0.48
8X
0.25
0.50 PITCH
DIMENSIONS: MILLIMETERS
March 2007

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