RT9108NZCP Richtek

RT9108NL 9W Stereo Class-D Audio Power Amplifier General Description Features zz z zz 8V to 16V Input Supply Range The RT9108NL is a high efficiency Class D stereo audio zz z zz 9W/CH into an 8 Load from 12V Supply at 10% amplifier for driving Bridge Tied Load (BTL) speakers. The THD+N RT9108NL can drive stereo speakers with load as low as zz z zz 88% Efficiency Eliminates Need for Heat Sinks 4. Its high efficiency eliminates the need for an extra zz z zz Four Selectable or Fixed Gain Settings heat sink when playing music. The gain of the amplifier zz z zz Robust Pin-to-Pin Short Circuit Protection can be controlled by two gain select pins. The outputs zz z zz Thermal Protection with Auto Recovery Option are fully protected against shorts to GND, PV , and CC zz z zz Surface Mount TSSOP-28 (Exposed Pad) Package output to output with an auto recovery feature and zz z zz RoHS Compliant and Halogen Free monitored output. Ordering Information Applications RT9108NL z LCD-TV Package Type z Monitors CP : TSSOP-28 (Exposed Pad-Option 3) z DVD Players Lead Plating System Z : ECO (Ecological Element with Pin Configurations Halogen Free and Pb free) (TOP VIEW) Note : Richtek products are : 28 SD PVCCL FAULT 2 27 NC RoHS compliant and compatible with the current require- 3 26 LINP BSPL LINN 4 25 ments of IPC/JEDEC J-STD-020. OUTPL 5 24 GAIN0 PGND Suitable for use in SnPb or Pb-free soldering processes. 6 23 GAIN1 OUTNL AVCC 7 22 BSNL AGND AGND 8 21 BSNR 9 20 GVDD OUTNR Marking Information PLIMIT 10 19 PGND RT9108NLZCP : Product Number 11 18 RINN OUTPR RT9108NL 12 17 RINP BSPR YMDNN : Date Code 13 16 NC NC ZCPYMDNN 29 14 15 MUTE PVCCR TSSOP-28 (Exposed Pad) Simplified Application Circuit RT9108NL BSPL FB PV CC PVCCx OUTPL PGND LINP OUTNL GAIN0 BSNL FB GAIN0 Audio BSNR FB Source GAIN1 GAIN1 OUTNR PGND OUTPR RINP BSPR FB AGND Copyright 2012 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. DS9108NL-01 June 2012 www.richtek.com 1RT9108NL Functional Pin Description Pin No. Pin Name Pin Function Shutdown Logic Input for Audio Amp (High = outputs enabled). TTL logic levels 1 SD with compliance to AVCC. Open Drain Output used to Display Short Circuit Fault Status. Voltage compliant to AVCC. Short circuit faults can be set to auto recovery by connecting FAULT pin 2 FAULT to SD pin. 3 LINP Positive Audio Input for Left Channel. Biased at 2V. 4 LINN Negative Audio Input for Left Channel. Biased at 2V. 5 GAIN0 Gain Select Least Significant Bit. 6 GAIN1 Gain Select Most Significant Bit. 7 AVCC Analog Supply Input. 8, Analog Ground. Connect to the thermal pad. The exposed pad must be soldered AGND 29 (Exposed Pad) to a large PCB and connected to AGND for maximum power dissipation. 9 GVDD High Side FET Gate Drive Supply. Nominal voltage is 4.6V. 10 PLIMIT Power Limit Level Adjustment. 11 RINN Negative Audio Input for Right Channel. Biased at 2V. 12 RINP Positive Audio Input for Right Channel. Biased at 2V. 13, 16, 27 NC No Internal Connection. 14 MUTE Mute Logic Input for Audio Amp (Low = outputs enabled). Power Supply Input for Right Channel H-Bridge. Right channel and left channel 15 PVCCR power supply inputs are connected internally. 17 BSPR Bootstrap I/O for Right Channel. Positive high side FET. 18 OUTPR Class-D H-Bridge Positive Output for Right Channel. 19, 24 PGND Power Ground for H-Bridges. 20 OUTNR Class-D H-Bridge Negative Output for Right Channel. 21 BSNR Bootstrap I/O for Right Channel. Negative high side FET. 22 BSNL Bootstrap I/O for Left Channel. Negative high side FET. 23 OUTNL Class-D H-Bridge Negative Output for Left Channel. 25 OUTPL Class-D H-Bridge Positive Output for Left Channel. 26 BSPL Bootstrap I/O for Left Channel. Positive high side FET. Power Supply Input for Left Channel H-Bridge. Right channel and left channel 28 PVCCL power supply inputs are connected internally. Copyright 2012 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. www.richtek.com DS9108NL-01 June 2012 2