The JTM4523 is a wide input voltage high-efficiency Step-dow

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 JTM4523 is a wide input voltage high-efficiency Step-down DC/DC converter that operates in either CV (Constant Output Voltage) mode or CC
(Constant Output Current) mode. JTM4523 provides up to 3A output current at 225-KHz switching frequency eases EMI design. Integrated sensor-less CC control scheme of the
       JTM4523 eliminates the expensive, high accuracy current sense resistor, making it ideal for battery charging applications and adaptors with accurate
current limit. The JTM4523 achieves higher efficiency than traditional constant current switching regulators by eliminating its associated
power loss.
      Protection features include cycle-by-cycle current limit, thermal shut-down, and frequency foldback at shot circuit. The devices are available in a SOP-
8EP package and require very few external devices for operation.

二.产品特点(Features)

10V to 36V Input Voltage
40V Transparent Input Voltage Surge
Up to 3A Constant Output Current
Output Voltage Up to 15V
High efficiency: up to 92%
225KHz Switching Frequency Eases EMI
Design
Integrated Sensor-less Constant Current (CC)
Control
Resistor Programmable for Current Limit from
1.5A to 3A
8% CC Accuracy

三,应用范围 (Applications)
Car Charger/Adaptor
Rechargeable Portable Devices
General-Purpose CC/CV Supply

四.下载产品资料PDF文档

JTM4523

五,产品封装图 (Package)

PIN 1	NAME HSB	PIN DESCRIPTION High Side Bias Pin. This provides power to the internal high-side MOSFET gate driver.
2	IN	Connect a 22nF capacitor from BS pin to SW pin. Power Supply Input. Bypass this pin with a 10 F ceramic capacitor to GND, placed as
		close to the IC as possible.
3 4	SW GND	Power Switching Output to External Inductor. Ground. Connect this pin to a large PCB copper area for best heat dissipation. Return FB, COMP, and ISET to this GND, and connect this GND to power GND at a single
5	FB	point for best noise immunity. Feedback Input. The voltage at this pin is regulated to 0.8V. Connect to the resistor
		divider between output and GND to set the output voltage.
6 7	COMP EN	Error Amplifier Output. This pin is used to compensate the converter. Enable Input. EN is pulled up to 4.8V with a 10µA current, and contains a precise 1.6V logic threshold. Drive this pin to a logic-high or leave unconnected to enable the IC.
8	ISET	Drive to a logic-low to disable the IC and enter shutdown mode. Output Current Setting Pin. Connect a resistor from ISET to GND to program the
	Exposed	output current. Heat Dissipation Pad. Connect this exposed pad to large ground copper area with

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