2x25W Class D Audio Amplifier with Boost Converter

Features 

•Output Power (fiN= 1kHz, RL=40, BTL)

VBAT = 7.2V, 2*25W (VOUT=14.8V, THD+N= 10%)

VBAT = 3.7V, 2x10W (VOUT=9V, THD+N= 10%)

•Output Power (fIN= 1kHz, RL=29, PBTL)

VBAT = 7.2V, 50W (VOUT=14.8V, THD+N= 10%)

VBAT = 3.7V, 20W (VOUT=9V, THD+N = 10%)

•Output Power (fN= 1kHz, RL=4Q, PBTL) 

VBAT = 3.7V, 20W (VOUT=12V, THD+N= 10%)

VBAT = 6.5V, 35W (VOUT=16V, THD+N = 10%)

•Power Supply VBAT: 2.7V~VOUT

•Spread Switching Frequency Function for AMP

•Integrated boost converter: adjustable output

voltage VOUT and switch peak current limit

•Over current protection/ Over temperature

protection / Overvoltage protection / Low voltage

malfunction prevention function with auto recovery

•Pb-free Packages, ETSSOP28

Description 

The HT81696 is a stereo Class D audio amplifier integrated　a boost converter. With wide input voltage range, HT81696　supports applications with single cell， two cell Lithium　batteries, 5V or 12V power supply and so on, and can drive　two speakers in BTL mode or one speaker in paralleled　PBTL mode.

HT81696 built-in boost converter supports selectable output voltage by external resistors for different applications with different power requirements. It also implements an adjustable switching peak current limit function through external resistors. HT81696 has a filter-less modulation circuit which can directly drive speakers. 

HT81696 can be shut down so that the power consumption can be minimized. As for protection function, over current protection function for speaker output　terminals, over temperature protection function, low supply　voltage malfunction preventing function and over boost voltage protection are also prepared.