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BELLING |
BL6311B
3 Watt Mono Filter-Free Class-D Audio Power Amplifier
Features
Efficiency With an 8-Ω Speaker:
88% at 400 mW
80% at 100 mW
2.6mA 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 (2.8 V to 5.5 V) Eliminates Need
a Voltage Regulator
Fully Differential Design Reduces RF Rectification and Eliminates Bypass Capacitor
Improved CMRR Eliminates Two Input Coupling Capacitors
Available in space-saving package: 9-bump WLCSP
for
General Description
The BL6311B is a 3-W high efficiency filter-free class-D audio power amplifier in a wafer
chip scale package (WCSP) that requires only three external components.
Features like 88% efficiency, −75dB PSRR, and improved RF-rectification immunity make
the BL6311B ideal for cellular handsets. In cellular handsets, the earpiece, speaker phone, and
melody ringer can each be driven by the BL6311B.
Applications
Mobile phone、PDA
MP3/4、PMP
Portable electronic devices
Pin Diagrams
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Ver1.2
Pin Description
Pin #
A1
A2
A3
B1
B2
B3
C1
C2
C3
Name
IN+
GND
VO-
VDD
PVDD
PGND
IN-
SDB
VO+
Description
Positive differential input
Power Ground
Negative BTL output
Power Supply
Power Supply
Power Ground
Negative differential input
Shutdown terminal (low active)
Positive BTL output
BL6311B
Function Block Diagram
Av1 = 150k/Ri
150k
(C1)
IN-
(A1)
IN+
Amp1
(C2)
SDB
150k
ShutDown
Control
300k
Bias &
Reference
PWM Modulator and
Power Driver
Av2 = 2 V/V
OSC &
RAMP
Start up &
Protection
OC
Detect
(B1)
VDD
(B2)
PVDD
(A3)
Vo-
(C3)
Vo+
(B3)
PGND
(A2)
GND
Notes: Total Voltage Gain = Av1× Av2 = 2 × 150k
RI
Figure 1. Function Block Diagram
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- Page 2 of 8 -
Ver1.2
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