一,产品概述(General Description)         
       The JTM1533 series is a CMOS step-up switching regulator which mainly consists of a reference voltage source, an oscillation circuit,an error amplifier, a phase compensation circuit,a PWM/PFM switching control circuit. With an
external low-ON-resistance Nch Power MOS,this product is applicable to applications requiring high efficiency and high output current.The JTM1533
series switches its operation to the PFM control circuit whose duty ratio is 15 % with to the PWM/PFM switching control circuit under a light load and to prevent decline in the efficiency by IC operation current.

二.产品特点(Features)
1.)Low voltage operation: Start-up is guaranteed from 0.9 V
                                    (IOUT =1 mA )
2.)Duty ratio: Built-in PWM/PFM switching control circuit 15 to 78 %
3.)oscillator frequency：1.0MHz
4.)External parts: coil, diode, capacitor, and transistor
5.)Output voltage range: 1.5V ~20V
6.)Output voltage accuracy：±2%
7.)Soft start function: 2 mS.
8.)PACKAGE：SOT23-5

三,应用范围 (Applications)
MP3 players, digital audio players
Digital cameras, GPS, wireless transceiver
Portable devices

四.下载产品资料PDF文档

JTM1533

五,产品封装图 (Package)

Pin Number	Pin Name	Function
SOT23-5
1
FB	Feed Back voltage pin
2	VDD	IC power supply pin
3	CE	Shutdown pin
4	GND	GND pin
5	EXT	External transistor connection pin

六.电路原理图


七,功能概述
4. Enhancement MOS FET type
For a MOS FET, an N-channel power MOS FET should be used. Because the gate voltage and current of the
external power MOS FET are supplied from the stepped up output voltage VOUT, the MOS FET is driven more
effectively. Depending on the MOS FET you use in your device, there is a chance of a current overrun at power
ON. Thoroughly test all settings with your device before deciding on which one to use. Also, try to use a MOS FET
with the input capacitance of 700 pF or less.
Since the ON resistor of the MOS FET might depend on the difference between the output voltage VOUT and the
threshold voltage of MOS FET, and affect the output current as well as the efficiency, the threshold voltage should
be low. When the output voltage is low, the circuit operates only when the MOS FET has the threshold voltage lower
than the output voltage.
5. Precautions
● Mount external capacitors, a diode, and a coil as close as possible to the IC.
● Unique ripple voltage and spike noise occur in switching regulators. Because they largely depend on the coil and
the capacitor used, check them using an actually mounted model.
●Make sure dissipation of the switching transistor (especially at a high temperature) does not exceed the allowable
power dissipation of the package.
●The performance of this IC varies depending on the design of the PCB patterns, peripheral circuits and external
parts. Thoroughly test all settings with your device. Also, try to use recommended external parts.

八,相关产品

外置MOS/扩流输出 DC-DC 升压IC
型号	工作模式	工作	输出电压	输出电	输出电	外置MOS	效率	静态	工作频率	封装	直接替代型号
		电压范围		压形式	压精度	最大输		电流
						出电流
JTM1533	PWM/PFM	0.9V-6.0V	1.5V-20V	可调输出	±2%	扩流达3A	90%	0.5uA	1MHz	SOT-25	XC9104/5/S8355/6/APW7077
											/EUP2573/SP6355
JTM1532	PWM/PFM	1.8V-6.0V	最大12V	可调输出	±2%	扩流达2A	92%	70uA	1.2MHz	SOT-25	XC9104/5/S8355/6/APW7077
											/EUP2573/SP6355
JTM9266	PWM	1V-10V	最大12V	可调输出	±2%	扩流达1.5A	92%	70uA	450KHz	SOT-26	RT9266/PT1301/AX1301
JTM5306	PWM	2.5V-100V	最大100V	可调输出	±2%	扩流0.5A	90%	220uA	1MHz	SOP-8	TAC2305
JTM3800S/T	PWM	1.8-15V		可调输出	±4%	扩流最大3A		1uA	1MHz	SOP8	MB3800/AT1380
										TSSOP8	APW7078
我司的JTMXX1CP/M SOT-89/SOT-23有以下优点：
1.输出电流最大可达500mA.
2.最低可达0.8V启动，启动电压低.
3.静态电流小，只有4uA(典型值)
4.工作频率可达350Khz(典型值)，纹波小，噪声低，对外界干扰小.
5.封装采用金线，全测产品，一致性好，品质稳定.
型号	工作模式	工作	输出电压	输出电	输出电	输出电	效率	静态	工作频率	封装	直接替代型号
		电压范围		压形式	压精度	流限制		电流
JTM6382	PFM	0.9V-5.0V	1.8/2.2/2.7/	固定输出	+/-2%	800mA	95%	15uA	300KHz	SOT-89	APW7079
			2.8/3.0/3.3/							SOT-23
			3.6/5.0V							SOT-25
JTM3400	PWM	0.9V-5.0V	最大5.5V	可调输出	+/-2%	950mA	90%	0.1uA	1.4MHz	SOT-26	LTC3400/LTC3429/
											AAT1217/AS2300/AIC3414
JTM9110	PWM	2.5V-4.5V	最大6V	可调输出	+/-2%	3.3A	93%	100uA	1MHz	ESOP-8	G5177B/C
JTM5177	PWM	2.5V-6.0V	最大5.5V	可调输出	+/-2%	6A	90%	0.5uA	1.2MHz	SOP8-PP	兼容G5177B/C
JTM5188	PWM	1.8V-6.0V	最大5.5V	可调输出	+/-2%	6A	90%	0.5uA	1.2MHz	SOP8-PP	兼容G5177B/C
JTM5179	PWM	3V-20V	最大22V	可调输出	+/-1.5%	扩流3A	90%	8uA	750KHz	MSOP-10
产品型号	输入电	输出电压	纹波电压	最大输	静态电流	截止电流	工作频率	效率	封装	替代型号
	压范围			出电流
JTM3200	2.7-Vout	5V	25mV	300mA	12uA	1uA	750KHz	92%	SOT-26	HX4004/LTC3200/AAT3110/
										RT9361/AAT1501/AIC1848/
										AP3602/LP3120
JTM9300	2.5V-6.0V	-	-	20mA*4	-	1uA	-		SOT-26	RT9300
小屏白灯背光驱动IC
型号	工作模式	工作电	过压保	反馈	开关电	效率	静态	工作	调光	调光频	封装
		压范围	护电压	电压	流限制		电流	频率	形式	率范围
JTM2126	PWM	2.5V-10V	29V	0.1V	320mA	85%	0.1uA	1.3MHz	PWM		SOT-25
JTM5121A	PWM	2.2V-6.0V	17V	0.25V	400mA	82%	3mA	1.4MHz	PWM	100Hz-1KHz	SOT-26
大中屏白灯背光驱动IC
型号	工作模式	工作电	过压保	反馈	开关电	效率	静态	工作	调光	调光频	封装
		压范围	护电压	电压	流限制		电流	频率	形式	率范围
JTM5665	PWM	2.2V-6.0V	17V	0.25V	700mA	82%	3mA	1.4MHz	PWM	100Hz-1KHz	SOT-26
JTM5662	PWM	2.5V-6.0V	23V	0.25V	1.0A	88%	0.4mA	1.0MHz	PWM	100Hz-10KHz	SOT-26
JTM5666	PWM	2.5V-6.0V	30V	0.104V	400mA	87%	0.2mA	1.2MHz	PWM	小于1KHz	SOT-26
JTM5666B	PWM	2.7V-6.0V	38V	0.2V	1A	91%	5uA	0.8MHz	PWM		SOT-26
JTM9293B	PWM	2.7V-6.0V	37V	0.3V	900mA	90%	0.28mA	0.9MHz	PWM	100Hz-200KHz	SOT-26
JTM9293C	PWM	2.5V-6.0V	36V	0.3V	2A	90%	0.4mA	1MHz	PWM	100Hz-200KHz	SOT-26
JTM9284A/B/C	PWM	2.5V-6.0V	28V	0.1V/	1.5A	90%	0.1uA	1.2MHz	PWM	20KHz-1MHz	SOT-26
				0.25V/
				0.3V
JTM5663	PWM	3V-25V	28V	0.2V	2A	90%	1uA	1.2MHz	PWM	20KHz-1MHz	SOT-26
JTM5663B	PWM	2.7V-6.5V	22V	0.2V	2.8A	95%	5uA	1MHz	PWM		SOT-26
同步升压白灯背光驱动IC
型号	工作模式	工作电	过压保	反馈	开关电	效率	静态	工作	调光	调光频	封装
		压范围	护电压	电压	流限制		电流	频率	形式	率范围
JTM3019	PWM	2.7V-16V	36V	0.2V	340mA	81%	3.2uA	1.2MHz	PWM		SOT-26
我司的JTM5665/SOT-26有以下优点：
1.最大700mA输出电流，带载能力强,输出电流大.
2.反馈电压0.25V.
3.带OVP功能,最高升压17V.
4.输入电压2.2-6.0V,启动电压低.
5.可实现PWM调光.
6.工作频率可达1.4Mhz,纹波小，噪声低，对外界干扰小.
7.可实现3串13并/5串9并和单路串5灯的白灯背光应用,可应用于10-12寸屏以内的白灯背光应用.
8.封装采用金线，全测产品，一致性好，品质稳定.