一,产品概述(General Description)         
Synchronous Rectification: Up to 95%
Efficiency
Single Inductor
Quiescent Current 3mA (50uA low power
mode: mode pin high)
Up to 700mA Continuous Output Current
2.2V to 5V Input and Output Voltage Range
No Schottky Diodes Required
Shutdown current: IQ 1µA
Package: Small Thermally Enhanced
DFN3*3-10L or MSOP-10L

二.产品特点(Features)
        The JTM3441 is high efficiency, fixed frequency,Buck-Boost DC/DC constant output currentconverter which operates from input voltages above, below or equal to the output voltage. The devices are suitable for single lithium-ion,multicell alkaline or NiMH applications where theoutput voltage is within the battery voltage
range.
        Other features include a below 1µA shutdown current, thermal shutdown and current limit. The JTM3441 converter is available in the 10-pin thermally enhanced DFN3*3-10L or MSOP-10L
packages.

三,应用范围 (Applications)
Digital cameras and Wireless handsets
Palmtop computers
Handheld instruments
MP3/MP4 players
Driver LED:1W/3W

四.下载产品资料PDF文档

JTM3441

五,产品封装图 (Package)

PIN NUMBER DFN3*3-10L or MSOP-10L	PIN NAME	FUNCTION
1	VC1	Frequency compensation
2	GND	Ground
3	S1	Switch 1
4	S2	Switch 2
5	GND	Ground
6	VOUT	Output
7	VIN	Input
8	EN	ON/OFF Control (High Enable)
9	VFB	Feedback
10	VC	Frequency compensation

六.电路原理图


七,功能概述
Applications Information
The JTM3441 employs a buck-boost DC/DC converter to generate the output voltage required to drive a
high current LED. This architecture permits high efficiency, low noise operation at input voltages above,
below or equal to the output voltage by properly phasing four internal power switches. The error amp
output voltage on the VC pin determines the duty cycle of the switches.
Since the VC pin is a filtered signal, it provides rejection of frequencies well below the factory trimmed
switching frequency of 1.1MHz. The low RDS (ON), low gate charge synchronous switches provide high
frequency pulse width modulation control at high efficiency.
 
Undervoltage Lockout
To prevent operation of the power switches at high RDS(ON), an undervoltage lockout is incorporated on
the JTM3441. When the input supply voltage drops below approximately 1.9V, power switches and all
control circuitry are turned off except for the undervoltage block, which draws a few microamperes.
八,相关产品

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			电流精度	调整率
JTM2803	0.9V-6.0V	1A	-	-	90%	1.0 MHz	PWM调光	SOT-26	PAM2803
JTM5663	3V-24V	内置2A MOS	2%	-	90%	1.2MHz	PWM调光	SOT-26	SY7200/1
JTM9293C	2.5V-5.5V	内置2A MOS	2%	-	90%	1.2MHz	PWM调光	SOT-26
JTM6281	3.6V-26V	2A	2%		92%	400KHz	PWM调光	SOP-8
JTM6283	3.6V-26V	2A	2%		92%	400KHz	PWM调光	SOP-8
JTM6283B	5V-45V	2A	2%		93%	400KHz	PWM调光	SOP-8
JTM6285	3.6V-36V	4A	2%		94%	180KHz	PWM调光	TO252-5L
JTM6286	5.0V-36V	5A	2%		94%	180KHz	PWM调光	TO252-5L
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JTM3441	2.2V-5.0V	0.7A	3%	95%	1.15MKHz	PWM调光	MSOP-10	LTC3454
JTM6281	3.6V-26V	2A	2%	92%	400KHz	PWM调光	SOP-8
JTM6283	3.6V-26V	2A	2%	92%	400KHz	PWM调光	SOP-8
JTM6283B	5V-45V	2A	2%	93%	400KHz	PWM调光	SOP-8
JTM6285	3.6V-36V	4A	2%	94%	180KHz	PWM调光	TO-252-5L
JTM6286	5.0V-36V	5A	2%	94%	180KHz	PWM调光	TO-252-5L
型号	工作电压	恒流值	工作电流	压差	工作结温	封装	直接替换
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JTM7137	2.7-5.5V/输入端可接400V高压	扩流100mA-3A	26uA	150mV	-105	SOT-25
JTM7138	3.0-6.0V/输入端可接400V高压	扩流20mA-3A	85uA	250mV	-20-85	SOT-25
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型号	工作电压	输出电流	开关频率	启动电压	封装	替代型号
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JTM6205	1.0V-1.5V	130mA	600KHz	1.0V	SOT-89
JTM6002A	1.0V-3.3V	500mA	350KHz	1.0V	SOT-89	兼容QX5235
JTM5103	2.1V-6.0V	扩流3A		2.1V	SOT-25
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JTM9805	24V--100V	0.5A	2%	95%	127KHz	SOP-8
JTM9804	24V--80V	1A	2%	96%	70KHz	TO252-5L
JTM9802	12V--80V	1A	2%	98%	80KHz	TO263-5L