FeaturesBL6311 BL6503 *

_ Efficiency With an 8-_ 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 (2.5 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

_ Available in space-saving package: 9-bump WLCSP

General DescriptionBL6311 BL6503 *

The BL6311 is a 2.5-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

BL6311 ideal for cellular handsets. In cellular handsets, the earpiece, speaker phone, and melody

ringer can each be driven by the BL6311.

ApplicationsBL6311 BL6503 *

_ Mobile phone、PDA

_ MP3/4、PMP

_ Portable electronic devices