LTK52203 Description:
    LTK52203 is a Class D audio power amplifier with PLIMIT high efficiency and no filters used to drive bridge stereo BTL or mono PBTL.
    LTK52203 can output at least 2x30W or more power in BTL mode and at least 60W or more power in PBTL mode without the need for a heat sink.
    Two modulation modes of Class D: DSM and SSM; DSM can provide better distortion, while SSM provides lower static current and EMI characteristics.
    LTK52203 has a bottom noise as low as 76uV, excellent on/off burst suppression function, and ultra-low THD+N distortion across the entire frequency range.
    PLIMIT can limit the output power of speakers, and the DC detection function can measure the frequency and amplitude of pulse width modulation (PWM). If the input capacitor is damaged or the input terminal is short circuited, LTK52203 will shut down the output stage, which can effectively protect various speakers.
    LTK52203 has various comprehensive circuit protection mechanisms, including automatic recovery function for ground, power, mutual short circuit protection, thermal protection, undervoltage and overvoltage protection.
    Advanced spread spectrum function and advanced electromagnetic interference (EMI) suppression technology can meet electromagnetic compatibility (EMC) requirements while allowing users to choose not to use or use low-cost magnetic bead filters at the output end according to their needs.

LTK52203 Feature:
Working voltage range: 6.0V -18V
PBTL mode applicable to mono
Fixed 26dB gain
PLIMIT function with horn protection
Contains two modulation methods: DSM and SSM
Output power
BTL Mode:
  at 10% THD+N
    – 2x27.5W, at VDD=15V, RL=4Ω 
    – 2x38.0W, at VDD=18V, RL=4Ω 
  at 1% THD+N
    – 2x22.6W, at VDD=15V, RL=4Ω 
    – 2x32.0W, at VDD=18V, RL=4Ω 
PBTL Mode:
  at 10% THD+N
    – 54.0W, at VDD=15V, RL=2Ω 
    – 57.4W, at VDD=18V, RL=3Ω 
DC detection protection function for protecting speakers
Efficiency of up to 90% in Class D operations reduces the requirement for heat sinks
Ultra low noise floor: 76uV (26dB, A-Weighting)
Filter free, low EMI design with spread spectrum capability
A comprehensive protection mechanism, including short-circuit protection with automatic recovery function, thermal protection, DC detection, and undervoltage and overvoltage protection, etc
Excellent THD+N and no popping sound design
Environmentally friendly packaging ETSSOP-20 that meets ROHS requirements

LTK52203 Application:
Various Bluetooth speakers, smart speakers
Television and monitor
Various home entertainment devices
Professional audio equipment

LTK52203 Simplified Application Schematic:

LTK52203 Pin Description:

LTK52203 Pin Function:

LTK52203 Functional Block Diagram:

LTK52203 Typical Application Circuit: