The JTM1509 is a 150 KHz fixed frequency PWM buck (step-down

1.产品概述         2.产品特点
3.应用范围       4.下载产品资料PDF文档
5.产品封装图                     6.电路原理图
7.功能概述       8.相关产品

一,产品概述(General Description)
     The JTM1509 is a 150 KHz fixed frequency PWM buck (step-down)
DC/DC converter,capable of driving a 2A load with highefficiency, low
ripple and excellent line and load regulation. Requiring a minimum
number of external components, the regulator is simple to use and
include internal frequency compensation and a fixed-frequency
oscillator.
      The PWM control circuit is able to adjust the duty ratio linearly
from 0 to 100%. An enable function, an over current protection function
is built inside. When second current limit function happens, the operation frequency will be reduced from 150KHz to 50KHz. An internal compensation
block is built in to minimize external component count.

二.产品特点(Features)
1.)Wide 4.5V to 40V Input Voltage Range
2.)3.3V,5V,12V, and adjustable versions
3.)Output Adjustable from 1.23V to 37V
4.)Maximum Duty Cycle 100%
5.)Minimum Drop Out 1.5V
6.)Fixed 150KHz Switching Frequency
7.)2A Constant Output Current Capability
8.)Internal Optimize Power Transistor
9.)High efficiency
10.)Excellent line and load regulation
11.)TTL shutdown capability
12.)ON/OFF pin with hysteresis function
13.)Built in thermal shutdown function
14.)Built in current limit function
15.)Built in second current limit function
16.)Available in SOIC8 package

三,应用范围 (Applications)
LCD Monitor and LCD TV
Digital Photo Frame
Set-up Box
ADSL Modem
Telecom / Networking Equipment

四.下载产品资料PDF文档

JTM1509

五,产品封装图 (Package)

Pin Number	Pin Name	Description
1	VIN	Supply Voltage Input Pin. JTM1509 operates from a 4.5V to 40V DC voltage. Bypass Vin to GND with a suitably large capacitor to eliminate noise on the input.
2	OUTPUT	Power Switch Output Pin (SW). Output is the switch node that supplies power to the output.
5~8	GND	Ground Pin. Care must be taken in layout. This pin should be placed outside of the Schottky Diode to output capacitor ground path to prevent switching current spikes from inducing voltage noise into JTM1509.
3	FEEDBACK	Feedback Pin (FB). Through an external resistor divider network, Feedback senses the output voltage and regulates it. The feedback threshold voltage is 1.23V.
4	ON/OFF	Enable Pin. Drive ON/OFF pin low to turn on the device, drive it high to turn it off. Floating is default low.

六.电路原理图

七,功能概述

Parameter	Symbol	Value	Unit
Input Voltage	Vin	-0.3 to 45	V
Feedback Pin Voltage	VFB	-0.3 to Vin	V
ON/OFF Pin Voltage	VON/OFF	-0.3 to Vin	V
Output Switch Pin Voltage	VOutput	-0.3 to Vin	V
Power Dissipation	PD	Internally limited	mW
Thermal Resistance (SOIC8) (Junction to Ambient, No Heatsink, Free Air)	RJA	100	ºC/W
Operating Junction Temperature	TJ	-40 to 125	ºC
Storage Temperature	TSTG	-65 to 150	ºC
Lead Temperature (Soldering, 10 sec)	TLEAD	260	ºC
ESD (HBM)		2000	V

八,相关产品

DC-DC降压IC

型号	输入耐压	输出电压	输出电流	反馈电压	工作频率	效率	静态	待机电流	封装	直接替换
型号	输入耐压	输出电压	输出电流	反馈电压	工作频率	效率	工作电流	待机电流	封装	直接替换
LM2596	45V	5.0V/可调输出	3A	1.23V	150K	90%	10mA	80uA	TO-263-5L	LM2596/AP1501
LM2596	45V	/3.3/12V	3A	1.23V	150K	(Max)	10mA	80uA	TO-220-5L	LM2596/AP1501
LM2576	45V	5.0V/可调输出	3A	1.23V	50K	90%	10mA	80uA	TO-263-5L	LM2576
LM2576	45V	/3.3/12V	3A	1.23V	50K	(Max)	10mA	80uA	TO-220-5L	LM2576
JTM1507	45V	5.0V/可调输出	3A	1.23V	380K	73%	2mA	0.2uA	TO-252-5L	AP1507
MP1410	27V	可调输出	2A	1.22V	420K	95%	1mA	25uA	SOP8	MP1410/ACT4060
										MP9141/RT826
										AP1534
JTM1509	45V	5.0V/可调输出	2A	1.23V	150K	82%	2mA	80uA	SOP8	AP1509
JTM1509	45V	3.3V/12V	2A	1.23V	150K	82%	2mA	80uA	SOP8	AP1509
JTM1513	20V	可调输出	2A	0.8V	150K	89%	2mA	1uA	SOP-8	AP1513
JTM1530	20V	可调输出	3A	0.8V	380K	88%	3mA	1uA	SOP-8	AP1510
JTM1583	28V	可调输出	3A	1.22V	380K	89%	3mA	1uA	SOP-8	MP1583
JTM3111	42V	可调输出	3A	0.8V	50-500K	91%	3mA	150uA	ESOP8	AX3111
JTM3112	40V	可调输出/	2A	1.18V	110K	93%	10mA	2mA	SOP8
JTM3112	40V	带CC/CV模式	2A	1.18V	110K	93%	10mA	2mA	SOP8
JTM3113B	40V	可调输出/	2.5A	1.0V	250K	91%	10mA	2mA	ESOP8
JTM3113B	40V	带CC/CV模式	2.5A	1.0V	250K	91%	10mA	2mA	ESOP8
JTM3101	45V	可调输出/	2A	1.235V	150K	83%	2.0mA		ESOP8
JTM3101	45V	带CC模式	2A	1.235V	150K	83%	2.0mA		ESOP8
JTM3102	45V	可调输出/	3A	1.25V	150K	89%	2.0mA		ESOP8
JTM3102	45V	带CC模式	3A	1.25V	150K	89%	2.0mA		ESOP8
JTM3109	40V	可调输出/	3A	1.25V	180K	89%	2.1mA		SOP8
JTM3109	40V	带CC/CV模式	3A	1.25V	180K	89%	2.1mA		SOP8
JTM3108	40V	可调输出/	3.5A	1.25V	180K	87%	2.1mA		ESOP8
JTM3108	40V	带CC/CV模式	3.5A	1.25V	180K	87%	2.1mA		ESOP8
JTM4523	40V	可调输出/	3A	0.8V	225K	92%	2.84mA	75uA	ESOP8	AC4523/F5335
JTM4523	40V	带CC/CV模式	3A	0.8V	225K	92%	2.84mA	75uA	ESOP8	AC4523/F5335
JTM3501	50V	5V固定输出	1.8A		150K	90%	4.7mA		SOP-8
JTM3511	50V	5V固定输出	2.1A		150K	90%	4.7mA		SOP-8
JTM3512	50V	5V固定输出	2.4A		150K	89%	4.7mA		SOP-8
JTM3513	50V	5V固定输出	3.2A		150K	87%	4.7mA		TO-252-5L

大电流DC-DC降压IC

型号	输入耐压	输出电压	输出电流	反馈电压	工作频率	效率	静态工作电流	待机电流	封装	直接替换
JTM3103	40V	可调输出	4A	1.25V	180K	94%	2.1mA		TO-252-5L
JTM3104	36V	可调输出	5A	1.22V	240K	95%	3.6mA		TO-263-5L
JTM3105	40V	可调输出	5A	1.25V	180K	96%	2.1mA		TO-263-5L
JTM3115	40V	可调输出	5A	1.25V	150K	86%	2mA		TO-263-5L
JTM3115	40V	带CC/CV模式	5A	1.25V	150K	86%	2mA		TO-263-5L

耐高压DC-DC降压IC

型号	输入耐压	输出电压	输出电流	反馈电压	工作频率	效率	静态工作电流	待机电流	封装	直接替换
JTM3107	75V	可调输出	1.2A	1.25V	180K	92%	3mA		SOP8
JTM3107B	85V	可调输出	0.4A	1.25V	150K	85%	2.5mA		SOP8
JTM3110	93V	可调输出	1A	1.25V	150K	83%	4.5mA		TO252-5L
JTM3110B	85V	可调输出	0.8A	1.25V	150K	85%	2.5mA		TO252-5L

我司的LM2596有如下优点：
1.最大可达3.5A-4A驱动电流
2.耐压可达45V.
3.和市场低端的那种只有1A电流的不同。

我司的LM2576有如下优点：
1.最大可达3A驱动电流
2.耐压可达45V.
3.和市场低端的那种只有1A电流的不同。


产品应用：
1.液晶电视/液晶显示器
2.车充
3.PDVD/车载DVD/汽车音响
4.小家电、家电控制板