The JTM3101 is a 150KHz 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 JTM3101 is a 150KHz fixed frequency PWM buck (step-down) DC/DC converter,capable of driving a 2A 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. 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.）Output Adjustable from 1.235V to 37V
3.）Minimum Drop Out 1.5V
4.）Fixed 150kHz Switching Frequency
5.）2A Constant Output Current Capability
6.）Internal Optimize Power Transistor
7.）Excellent line and load regulation
8.）TTL shutdown capability
9.）ON/OFF pin with hysteresis function
10.）With output constant current loop
11.）Built in thermal shutdown function
12.）Built in current limit function
13.）Built in output over voltage protection
14.）SOP8-EP (Exposed PAD) package

三,应用范围 (Applications)
Car Charger
Battery Charger
LED Constant Current Driver

四.下载产品资料PDF文档

JTM3101

五,产品封装图 (Package)

Pin Number	Pin Name	Description
1,2	SW	Power Switch Output Pin (SW). Output is the switch node that supplies power to the output.
3	GND	Ground Pin.(Note: Connected the back exposed PAD to Pin3.)
4	FB	Feedback Pin (FB). Through an external resistor divider network, Feedback senses the output voltage and regulates it. The feedback threshold voltage is 1.235V.
5	CS	Output Current Sense Pin; (Iload=0.155V/Rcs)
6	EN	Enable Pin. Drive EN pin low to turn on the device, drive it high to turn it off. Floating is default low.
7,8	VIN	Supply Voltage Input Pin. HM3101 operates from a 4.5V to 40V DC voltage. Bypass Vin to GND with a suitably large capacitor to eliminate noise on the input.

六.电路原理图

七,功能概述

Parameters	Symbol	Test Condition	Min.	Typ.	Max.	Unit
Input operation voltage	Vin		4.5		40	V
Shutdown Supply Current	ISTBY	VEN=5V		80	200	uA
Quiescent Supply Current	Iq	VEN =0V, VFB =Vin		2	5	mA
Oscillator Frequency	Fosc		127	150	172	Khz
Switch Current Limit	IL	VFB =0		3		A
EN Pin Threshold	VEN	High (Regulator OFF) Low (Regulator ON)		1.4 0.8		V
Output Saturation Voltage	VCE	VFB=0V ISW=2A		1.1	1.4	V
Constant current sense Voltage	VCS		0.132	0.155	0.178	V

(责任编辑：oumao18)