Document
BL6305
2.6 Watt Mono Filter-Free Class-D Audio Power Amplifier
Features
Efficiency With an 8-Ω Speaker: 88% at 400 mW 80% at 100 mW
2.1mA Quiescent Current 0.4µA Shutdown Current Optimized PWM Output Stage Eliminates LC Output Filter Internally Generated 250-kHz Switching Frequency Eliminates Capacitor and Resistor Improved PSRR (−75 dB) and Wide Supply Voltage (2.5 V to 5.5 V) Eliminates Need for a Voltage Regulator Fully Differential Design Reduces RF Rectification and Eliminates Bypass Capacitor Improved CMRR Eliminates Two Input Coupling Capacitors MSOP8, SOP8, DFN8 package
General Description
The BL6305 is a 2.6W high efficiency filter-free class-D audio power amplifier that requires only three external components.
Features like 88% efficiency, −75dB PSRR, and improved RF-rectification immunity make the BL6305 ideal for cellular handsets. In cellular handsets, the earpiece, speaker phone, and melody ringer can each be driven by the BL6305.
Applications
Mobile phone、PDA MP3/4、PMP Portable electronic devices
Order Information
Part Number BL6305MM BL6305DN BL6305SO
Pin Diagrams
Package MSOP8 DFN8 SOP8
Shipping 3000 pcs / Tape & Reel 3000 pcs / Tape & Reel 2500 pcs / Tape & Reel
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Ver1.2
BL6305
Pin Description
Pin # 1 2 3 4 5 6 7 8
Name SDB
IN+ INVO+ VDD PGND VO-
Description Shutdown terminal (low active) NC (No internal connection) Positive differential input Negative differential input Positive BTL output Power Supply Power Ground Negative BTL output
Function Block Diagram
Av1 = 170k/Ri
170k
(4) IN-
Amp1
(3) IN+
170k (1) ShutDown SDB Control
300k
Bias & Reference
PWM Modulator and Power Driver
Av2 = 2 V/V
OSC & RAMP
Start up & Protection
OC Detect
s: Total Voltage Gain = Av1 × Av2 = 2 × 170k RI
Figure 1. Function Block Diagram
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(6) VDD
(8) Vo(5) Vo+ (7) GND
Note
Ver1.2
Application Circuit
BL6305
Ri
Differential Input
Ri
Vi- -
+
Vi+ +
-
PWM & BTL (Closed Loop)
VDD To Battery Cs
Vo+ Vo-
GND
SDB
Bias & ShutDown
OSC & RAMP
Figure 2. BL6305 Application Schematic With Differential Input
Ci Ri
Differential Input
Ci Ri
Vi- -
+
Vi+ +
-
PWM & BTL (Closed Loop)
VDD To Battery Cs
Vo+ Vo-
GND
SDB
Bias & ShutDown
OSC & RAMP
Figure 3. BL6305 Application Schematic With Differential Input and Input Capacitors
Ci Sin le-ended
Input
Ri
Vi- -
+
VDD To Battery Cs
Vo+
PWM & BTL (Closed Loop)
Vi+ +
-
Ci Ri
Vo-
GND
SDB
Bias & ShutDown
OSC & RAMP
Figure 4. BL6305 Application Schematic With Single-Ended Input
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Ver1.2
Electrical Characteristics
The following specifications apply for the circuit shown in Figure 5. TA = 25 , unless otherwise specified.
Symbol
Parameter
Conditions
ISD Shutdown Current IQ Quiescent Current
VOS Output Offset Voltage
PSRR Power Supply Rejection Ratio CMRR Common Mode Rejection Ratio
FSW Modulation frequency
VIN=0V, VSDB=0V, No Load VDD = 2.5V, VIN = 0V, No Load VDD = 3.6V, VIN = 0V, No Load VDD = 5.5V, VIN = 0V, No Load VIN = 0V, AV = 2V/V, VDD = 2.5V to 5.5V VDD = 2.5V to 5.5V VDD = 2.5V to 5.5V, VIC = VDD/2 to 0.5V, VIC = VDD/2 to VDD - 0.8V VDD = 2.5V to 5.5V
AV Voltage gain
VDD = 2.5V to 5.5V
RSDB ZI TWU
rDS(on)
Resistance from SDB to GND Input impedance Wake-up time from shutdown VDD = 3.6V
VDD = 2.5V Drain-Source resistance (on-state) VDD = 3.6V
VDD = 5.5V
Min.
200
320k RI
160
BL6305
Spec Typ.
0.4 1.8 2.1 2.5
Units Max.
2 uA 3.2
mA 4.5
2 25 mV
-75 dB
-68 dB
250
340k RI
300 170
1 700 500 400
300
360k RI
180
kHz V/V kΩ kΩ mS
mΩ
Operating Characteristics
VDD = 5V, RI = 150kΩ, TA = 25 , unless otherwise specified.
Symbol Parameter
Conditions
PO Output Power Total Harmonic
THD+N Distortion + Noise
THD+N=10%, f=1KHz, RL = 4Ω THD+N=1%, f=1KHz, RL = 4Ω THD+N=10%, f=1KHz, RL = 8Ω THD+N=1%, f=1KHz, RL = 8Ω
Po=1.0Wrms, f=1kHz, RL = 8Ω
SNR Signal-to-Noise ratio VDD=5V, Po=1.0Wrms, RL = 8Ω
Min.
Spec Typ.
2.65 2.15 1.65 1.33
Units Max.
W
0.21 %
95 dB
VDD = 3.6V, RI = 150kΩ, TA = 25 , unless otherwise specified.
Symbol Parameter
Conditions
PO Output Power
THD+N=10%, f=1KHz, RL = 4Ω THD+N=1%, f=1KHz, RL = 4Ω THD+N=10%, f=1KHz, RL = 8Ω THD+N=1%, f=1KHz, RL = 8Ω
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Min.
Spec Typ.
1.35 1.08 0.85 0.69
Units Max.
W Ver1.2
Total Harmonic
THD+N
Po=0.5Wrms, f=1kHz, RL = 8Ω
Distortion + Noise
KSVR Vn
Supply ripple
VDD = 3.6V, input ac-grounded with CI = 2uF
rejection ratio
f=217Hz, V(Ripple)=200mVPP
VDD = 3.6V, input ac-grounded No weighting Output voltage noise
with CI = 2uF, f=20~20kHz A weighting
Common Mode CMRR
Rejection Ratio
VDD = 3.6V, VIC = 1 VPP, f=217Hz
BL6305
0.21 %
-67 dB 87
uVRMS 65 -70 dB
VDD = 2.5V, RI = 150kΩ, TA = 25 , unless otherwise specified.
Symbol Parameter
Conditions
PO Output Power Total Harmonic
THD+N Distortion + Noise
THD+N=10%, f=1KHz, RL = 4Ω THD+N=1%, f=1KHz, RL = 4Ω THD+N=10%, f=1KHz, RL = 8Ω THD+N=1%, f=1KHz.