一,产品概述(General Description)   
      The JTM1583 is a 380KHz fixed frequency PWM buck (step-down) DC/DC converter, capable of driving a 3A load with high efficiency, 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 short protection function happens, the operation frequency will be reduced from 380KHz to 80KHz. An internal compensation block is built in to minimize external component count
二.产品特点(Features)

• Wide 3.6V to 23V Input Voltage Range
• Output Adjustable from 1.222V to 21V
• Maximum Duty Cycle 100%
• Minimum Drop Out 0.6V
• Fixed 380KHz Switching Frequency
• 3A Constant Output Current Capability
• Internal Optimize Power MOSFET
• High efficiency
• Excellent line and load regulation
•  TTL shutdown capability
• EN pin with hysteresis function
• Built in thermal shutdown function
• Built in current limit function
• Built in output short protection function
• Available in SOP8 package

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

四,产品封装图 (Package)

Pin Number	Pin Name	Description
1,6,8	NC	No Connected.
2	VIN	Supply Voltage Input Pin. JTM1583 operates from a 3.6V to 23V DC voltage. Bypass Vin to GND with a suitably large capacitor to eliminate noise on the input.
3	SW	Power Switch Output Pin (SW). Output is the switch node that supplies power to the output.
4	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 JTM1583.
5	FB	Feedback Pin (FB). Through an external resistor divider network, Feedback senses the output voltage and regulates it. The feedback threshold voltage is 1.222V.
7	EN	Enable Pin. Drive EN pin low to turn off the device, drive it high to turn it on. Floating is default high.

五,电路原理图

六, 产品PCB
(略)
七.产品BOM  
  Schottky Diode Selection Table

Current	Surface Mount	Through Hole	VR (The same as system maximum input voltage)
			20V	30V	40V	50V	60V
1A		√	1N5817	1N5818	1N5819
3A		√	1N5820	1N5821	1N5822
		√	MBR320	MBR330	MBR340	MBR350	MBR360
	√		SK32	SK33	SK34	SK35	SK36
	√			30WQ03	30WQ04	30WQ05
		√		31DQ03	31DQ04	31DQ05
		√	SR302	SR303	SR304	SR305	SR306

八.产品PDF文档 

JTM1583

JTM1583A

九,功能概述
JTM1583 Electrical Characteristics
Ta = 25℃;unless otherwise specified.

Symbol	Parameter	Test Condition	Min.	Typ.	Max.	Unit
System parameters test circuit figure4
VFB	Feedback Voltage	Vin = 7V to 25V, Vout=5V Iload=0.2A to 3A	1.186	1.222	1.258	V
Efficiency	ŋ	Vin=12V ,Vout=5V Iout=3A	-	89	-	%

 
Electrical Characteristics (DC Parameters)
Vin = 12V, GND=0V, Vin & GND parallel connect a 220uf/50V capacitor; Iout=500mA, Ta =
25℃; the others floating unless otherwise specified.

Parameters	Symbol	Test Condition	Min.	Typ.	Max.	Unit
Input operation voltage	Vin		3.6		23	V
Shutdown Supply Current	ISTBY	VEN=0V		60	200	uA
Quiescent Supply Current	Iq	VEN =2V, VFB =Vin		3	5	mA
Oscillator Frequency	Fosc		323	380	437	Khz
Switch Current Limit	IL	VFB =0		4.7		A
EN Pin Threshold	VEN	High (Regulator ON) Low (Regulator OFF)		1.4 0.8		V
EN Pin Input Leakage Current	IH	VEN =2V (ON)		1	15	uA
	IL	VEN =0V (OFF)		1	15	uA
Max. Duty Cycle	DMAX	VFB=0V		100		%

Absolute Maximum Ratings (Note 1)

Note 1: Stresses listed as the above “Absolute Maximum Ratings” may cause permanent damage to the device.
Exposure to absolute maximum rating conditions for extended periods may remain possibility to affect device reliability.
Note 2: The JTM1583A is guaranteed to meet performance specifications from 0°C to 70°C. Specifications over the –40°C
to 85°C operating temperature range are assured by design, characterization and correlation with statistical process
controls.

十,相关产品

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							工作电流
LM2596	45V	5.0V/可调输出	3A	1.23V	150K	90%	10mA	80uA	TO-263-5L	LM2596/AP1501
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LM2576	45V	5.0V/可调输出	3A	1.23V	50K	90%	10mA	80uA	TO-263-5L	LM2576
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JTM1509	45V	5.0V/可调输出	2A	1.23V	150K	82%	2mA	80uA	SOP8	AP1509
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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
		带CC/CV模式
JTM3113B	40V	可调输出/	2.5A	1.0V	250K	91%	10mA	2mA	ESOP8
		带CC/CV模式
JTM3101	45V	可调输出/	2A	1.235V	150K	83%	2.0mA		ESOP8
		带CC模式
JTM3102	45V	可调输出/	3A	1.25V	150K	89%	2.0mA		ESOP8
		带CC模式
JTM3109	40V	可调输出/	3A	1.25V	180K	89%	2.1mA		SOP8
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JTM3108	40V	可调输出/	3.5A	1.25V	180K	87%	2.1mA		ESOP8
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JTM4523	40V	可调输出/	3A	0.8V	225K	92%	2.84mA	75uA	ESOP8	AC4523/F5335
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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