一,产品概述(General Description)         
     jtm4890 is an audio power amplifier primarily designed for demanding applications in mobile phones and other portable communication device applications. It is capable of delivering 1 watt of continuous average power to an 8Ω BTL load with less than 1% distortion (THD+N) from a 5V DC power supply.
Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components.
     jtm4890 does not require output coupling capacitors or bootstrap capacitors, and therefore is ideally suited for mobile phone and other low voltage applications where minimal power consumption is a primary requirement.
      The jtm4890 features a low-power consumption shutdown mode which is achieved by driving the shutdown pin with logic low.Additionally, the jtm4890 features an internal thermal shutdown protection mechanism. The jtm4890 contains advanced pop & click circuitry which eliminates noises which would otherwise occur during turn-on and  turn-off transitions. jtm4890 is unity-gain stable a nd can be configured by external gain-setting resistors.

二.产品特点(Features)
PSRR at 217Hz, VDD = 5V (Fig. 1) 62dB(typ.)
Power Output at 5.0V & 1% THD 1W(typ.)
Power Output at 3.3V & 1% THD 400mW(typ.)
Shutdown Current 0.1μA(typ.)
 
三,应用范围 (Applications)
Mobile Phones
PDAs
Portable electronic devices

四.下载产品资料PDF文档

JTM4890

五,产品封装图 (Package)

PIN NUMBER	NAME	FUNCTION
MSOP8
1
Shutdown	Shutdown
2	Bypass	Bypass
3	+IN	Input 1
4	-IN	Input 2
5	Vo1	Output 1
6	VDD	VDD
7	GND	Ground
8	Vo2	Output 2

六.电路原理图


七,功能概述
Absolute Maximum Ratings @TA = 25°C unless otherwise noted
Supply Voltage -------------------- ---------6.0V
Storage Temperature ---------------------−65°C to +150°C
Input Voltage --------------------------------−0.3V to VDD +0.3V
Power Dissipation -------------------------- Internally Limited
ESD Susceptibility----------------------------2000V
Junction Temperature ----------------------150°C

八,相关产品

型号	工作电压范围	静态电流	输出功率	静态输出电压	纹波抑制比	通道隔离度	封装	代替型号
JTM4871	2V-5.5V	6.5mA	3W/Vcc=5V	5mV/Vcc=5V	60dB		SOP8	LM4871
			Rl=3oJTM
JTM8002	2V-5.5V	6.5mA	3W/Vcc=5V	5mV/Vcc=5V	60dB		SOP8	CSC8002
			Rl=3oJTM
JTM4863	2V-5.5V	6mA	2.5W/Vcc=5V	50mV/Vcc=5V	67dB	90dB	TSSOP20-PP/	LM4863
			Rl=3oJTM				SOP16/DIP16
JTM8403	2V-5.5V	16mA	3.2W/Vcc=5V	5mV/Vcc=6V	58dB	95dB	SOP16	PAM8403
			Rl=4oJTM
JTM2822/TDA2822	1.8V--6V	6mA	0.35W/Vcc=3V	1.2V/Vcc=3V	30dB	50dB	SOP8/DIP8	TDA2822
			Rl=4oJTM
JTM2025/TEA2025_9V	3V--9V	40mA	2.3W/Vcc=9V	4.5V/Vcc=9V	46dB	55dB	DIP16	TEA2025
			Rl=4oJTM
JTM2025/TEA2025_12V	3V--12V	40mA	2.3W/Vcc=9V	4.5V/Vcc=9V	46dB	55dB	DIP16	TEA2025
			Rl=4oJTM
JTM4871/SOP8/3W有如下优点：
1.工作电压2.0-5.5V,耐压6V
2.输出功率可以达3W/3OJTM和2.5W/4OJTM
3.没有交越失真的问题
4.音质比较好，音量比较大，音质/音量可以和CSC8002媲美。
JTM8403/SOP16有如下优点：
1.工作电压范围在2.5-5.5V,耐压6V
2.输出功率可达3W/4 OJTM.
3.音量比较大，音质比较好，音质/音量可以和原装的PAM8403媲美。
JTM4863/SOP16&DIP16&TSSOP20有如下优点：
1.工作电压范围在2.0-5.5V,耐压6V
2.输出功率可达2.5W/3 OJTM-2.2W/4 OJTM.
3.音量比较大，音质比较好，音质/音量可以和CSC4863媲美。