G1431 Global Mixed-mode Technology Inc. 2W Stereo Audio Amplifier Features General Description G1431 is a stereo audio power amplifier in 20pin TSSOP thermal pad package or 20-pin TQFN 4X4. It can drive 2W continuous RMS power into 4Ω load per channel in Bridge-Tied Load (BTL) mode at 5V supply voltage. Its THD is smaller than 1% under the above operation condition. To simplify the audio system design in the notebook application and to enlarge the driving power, G1431 supports the Bridge-Tied Load (BTL) mode for driving the speakers. For the low current consumption applications, the SHDN mode is supported to disable G1431 when it is idle. The current consumption can be reduced to 150µA (typically). Internal Gain Control, Which Eliminates External Gain-Setting Resistors Depop Circuitry Integrated Output Power at 1% THD+N, VDD=5V --2.0W/CH (typical) into a 4Ω Load --1.2W/CH (typical) into a 8Ω Load Bridge-Tied Load (BTL) Supported Fully differential Input Shutdown Control Available Surface-Mount Power Package Over-Temperature Protection Embedded 20-Pin TSSOP-P & 20-Pin TQFN 4X4 Amplifier gain is internally configured and controlled by two terminals (GAIN0, GAIN1). BTL gain settings of 6dB, 10dB, 15.6dB, 21.6dB are provided. Applications Stereo Power Amplifiers for Notebooks or Desktop Computers Multimedia Monitors Stereo Power Amplifiers for Portable Audio Systems Ordering Information ORDER MARKING NUMBER G1431F2U G1431R9U G1431 1431 TEMP. RANGE PACKAGE (Green) -40°C to +85°C TSSOP-20 (FD) -40°C to +85°C TQFN4X4-20 Note: F2: TSSOP-20 (FD) U: Tape & Reel R9:TQFN4X4-20 VDD PVDD ROUT- 12 11 14 13 ROUT+ RIN- 15 Pin Configuration G1431 GND 1 20 GAIN0 2 19 SHUTDOWN GAIN1 3 18 ROUT+ GND SHUTDOWN 16 10 LOUT+ 4 GND 17 9 GND LIN- 5 GND 18 8 GND PVDD 6 GAIN0 19 7 BYPASS GAIN1 20 6 LIN+ RIN+ LOUT- 7 8 13 GND LIN+ 9 12 NC BYPASS 10 11 GND 3 4 5 RIN+ LOUT- LIN- PVDD 1 2 LOUT+ Thermal Pad NC Thermal Pad 17 RIN- 16 15 PVDD 14 ROUT- VDD Top View TSSOP-20 (FD) G1431 TQFN4X4-20 TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.8 Dec 22, 2008 1