LTK5128D 5W Audio power amplifier chip IC SOP8

Description

LTK5128D 5W Audio power amplifier chip IC SOP8

Product Description

The LTK5128D is a mono audio power amplifier chip that supports dual-mode operation (Class D / Class AB). It’s designed for small audio systems (e.g. Bluetooth speakers, portable audio) and supports a “mode” pin to switch operation to minimize interference and EMI. It can drive 4 Ω or 3 Ω speakers, offering higher output in Class D mode, with efficiency above 90%.

Key Features

• Operating voltage range: ~ 2.5 V to 7 V

• In Class D mode, efficiency > 90%

• Supports Class D and Class AB modes (switchable via MODE pin)

• Filterless Class D / AB amplifier (no external low-pass filter required)

• Low quiescent current and low EMI

• FM-mode interference suppression (no interference with FM radio)

• Popping/noise suppression circuitry

• Low noise floor, low distortion

• In Class D mode, at VDD = 7 V & 10 % THD+N:
    • 6 W output to 4 Ω + 33 µH load
    • 7.3 W output to 3 Ω + 33 µH load

• In Class D mode, at VDD = 5 V & 10 % THD+N: ~3 W output to 4 Ω

• Short circuit protection

• Under-voltage lockout (protection)

• Over-temperature protection

• Low shutdown current (< 0.5 µA)

Applications

• Bluetooth / wireless speakers

• Portable audio devices

• USB / small desktop speakers

• TVs, media players

• Smart home audio devices

• Toys with audio