The JTMX2984 is a 150 KHz fixed frequency PWM buck (step-dow

1.产品概述 2.产品特点 3.应用范围 4.技术规格书下载（产品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 JTMX2984 is a 150 KHz fixed frequency PWM buck (step-down)
DC/DC converter,capable of driving a 2.4A 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 JTMX2984 built in output short protection function. When short
protection function happens, the chip will be shutdown. An internal
compensation block is built in to minimize external component count.

二.产品特点(Features)

Wide 8V to 40V input voltage range.
Fixed 5V output voltage.
Maximum 2.4A output current.
Fixed 150KHz switching frequency.
Internal optimize power MOSFET.
High efficiency up to 92%.
Built in output short shutdown function.
Excellent line and load regulation.
Built in thermal shutdown function.
Built in current limit function.
Available in SOP8L package.

三,应用范围 (Applications)

Car Charger.
Battery Charger.
USB Power Supply.

四.技术规格书下载（产品PDF）

JTMX2984

五,产品封装图 (Package)

Pin Number	Pin Name	Description
1	FB	Feedback Pin (FB). The feedback threshold voltage is 5V.
2	NC	No Connected.
3	VC	Internal Voltage Regulator Bypass Capacity. In typical system application, The VC pin connect a 1uf capacity to VIN.
4	VIN	Supply Voltage Input Pin. JTMX2984 operates from 8V to 40V DC voltage. Bypass Vin to GND with a suitably large capacitor to eliminate noise on the input.
5,6	SW	Power Switch Output Pin (SW). SW is the switch node that supplies power to the output.
7,8	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 JTMX2984.

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
Output Switch Pin Voltage	VOutput	-0.3 to Vin	V
Power Dissipation	PD	Internally limited	mW
Thermal Resistance (SOP8L) (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,相关芯片选择指南

产品型号	输入电压	开关电流	开关频率	恒压设置	恒流设置	封装类型
JTMX2981	8V ~ 45V	1.8A	150KHz	固定5V	最大1.8A	SOP8L
JTMX2982	8V ~ 45V	2.1A	150KHz	固定5V	最大2.1A	SOP8L
JTMX2984	8V ~ 40V	2.4A	150KHz	固定5V	最大2.4A	SOP8L
JTMX2985	8V ~ 40V	3.2A	150KHz	固定5V	最大3.2A	TO252-5L

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