LTK5127 Description:
    The LTK5127 is a 5W, mono Class AB/Class D mode switching, ultra-low EMI, no filter audio power amplifier chip.
    The LTK5127 can be easily switched to Class AB MODE through a mode pin, completely eliminating EMI interference. Operating voltage of 2.5V-5.5V, it can provide efficiency of more than 90% in Class D amplifier mode, and the new filterless structure can eliminate the input low-pass filter of traditional Class D amplifier, thus saving system cost and PCB space, which is ideal for portable applications.
    The LTK5127 uses unique Dynamic range control (DRC) technology to reduce distortion due to waveform top cutting during high power output, and has a better dynamic response than similar products.
    The LTK5127 is packaged in SOP-8.

Bluetooth speaker
Pull rod speaker
USB speaker
Video machine
megaphone

LTK5127 Max rating (TA=25℃)

Parameter name	symbol	Numerical value	unit
Operating voltage	Vcc	6.0	V
Storage temperature	Tstg	-65℃-150℃	℃
Input voltage		-0.3 to +（0.3+ Vcc）	V
Power consumption	PD	See note 1	W
Junction temperature		160℃	℃

Note 1: The maximum power consumption depends on three factors: TJMAX, TA, θJA, its calculation formula PDMAX= (TJmax-TA) /θJA, LTK5127 TJMA=150℃. TA is the temperature of the external environment, and θJA depends on different packaging forms.


LTK5127 Electrical parameters
LTK5127 CLASS D mode
1) Static electrical parameters of LTK5127
MODE=VDD, ClassD mode, VDD=5V, TA=25 ° C:

signal	Parameter name	Test condition		Minimum value	Typical value	Maximum value	unit
VDD	Supply voltage			2.5	5	5.5	V
IDD	Static supply current	MODE=VDD；VDD=5V，IO=0A		2	5	8	mA
ISHDN	Turn-off current	VDD=2.5V 到 5.5V				1	uA
FSW	Oscillation frequency	VDD=2.5V 到 5.5V			480		kHz
Vos	Output offset voltage	VDD=5V，VIN=0V			10		mV
η	efficiency	THD+N=10%, f=1kHz,RL=2Ω；			87		%
		THD+N=10%, f=1kHz,RL=4Ω；			90
OTP	Overtemperature protection				155		℃
RDSON	Static on-resistance	IDS=0.5A  VGS=5V	P_MOSFET		180		mΩ
			N_MOSFET		140

 
2) LTK5127 dynamic electrical parameters
MODE=VDD, ClassD mode, VDD=5V, TA=25 ° C:

signal	Parameter name	Test condition		Minimum value	Typical value	Maximum value	unit
Po	Output power	THD+N=10%, f=1kHz RL=4Ω；	VDD=5V		2.9		W
			VDD=3.6V		2.3
			VDD=3V		1.3
		THD+N=1%, f=1kHz RL=4Ω；	VDD=5V		2.5		W
			VDD=3.6V		1.6
			VDD=3V		0.8
		THD+N=10%, f=1kHz RL=2Ω；	VDD=5V		4.9	5.5	W
			VDD=3.6V		3.2	3.5
			VDD=3V		2.3	2.6
		THD+N=1%, f=1kHz RL=2Ω；	VDD=5V		4.6	4.8	W
			VDD=3.6V		2.8	3
			VDD=3V		1.4	1.5
THD+N	Total harmonic distortion plus noise	VDD=5V Po=0.6W, RL=8Ω	f=1kHz		0.12		%
		VDD=3.6V Po=0.6W, RL=8Ω			0.1
		VDD=5V Po=1W,RL=4Ω	f=1kHz		0.12
		VDD=3.6V Po=1W, RL=4Ω			0.1
PSRR	Power supply voltage rejection ratio	VDD=5V, VRIPPLE=200mVRMS, RL=8Ω, CB=2.2µF			64		dB
SNR	Signal-to-noise ratio	VDD=5V, Vorms=1V, Gv=20dB			85		dB

 

LTK5127 CLASS AB mode (ESOP-8 package)
1) Static electrical parameters of LTK5127
MODE=GND, ClassAB mode, VDD=5V, TA=25℃ :

signal	Parameter name	Test condition	Minimum value	Typical value	Maximum value	unit
VDD	Supply voltage		2.5	5	5.5	V
IDD	Static supply current	VDD=5V，IO=0A	6	10	14	mA
ISHDN	Turn-off current	VDD=2.5V 到 5.5V			1	uA
Vos	Output offset voltage	VDD=5V，VIN=0V		10		mV
OTP	Overtemperature protection			155		℃

 
2 LTK5127 Dynamic electrical parameters
MODE=GND, ClassAB mode, VDD=5V, TA=25℃ :

signal	Parameter name	Test condition		Minimum value	Typical value	Maximum value	单位
Po	Output power	THD+N=10%, f=1kHz RL=4Ω；	VDD=5V		2.9		W
			VDD=3.6V		2
			VDD=3V		1.3
		THD+N=1%, f=1kHz RL=4Ω；	VDD=5V		2.6		W
			VDD=3.6V		1.6
			VDD=3V		0.8
		THD+N=10%, f=1kHz RL=2Ω；	VDD=5V		4.9	5.5	W
			VDD=3.6V		3.2	3.5
			VDD=3V		2.3	2.6
		THD+N=1%, f=1kHz RL=2Ω；	VDD=5V		4.5	4.6	W
			VDD=3.6V		2.7	2.9
			VDD=3V		1.4	1.5
THD+N	Total harmonic distortion plus noise	VDD=5V Po=0.6W, RL=8Ω	f=1kHz		0.18		%
		VDD=3.6V Po=0.6W, RL=8Ω			0.15
		VDD=5V Po=1W,RL=4Ω	f=1kHz		0.15
		VDD=3.6V Po=1W, RL=4Ω			0.12
PSRR	Power supply voltage rejection ratio	VDD=5V, VRIPPLE=200mVRMS, RL=8Ω, CB=2.2µF			69		dB
SNR	Signal-to-noise ratio	VDD=5V, Vorms=1V, Gv=20dB			82		dB