The JTMA8725A is a voltage mode, fixed 300kHz-switch-ing fr

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 JTMA8725A is a voltage mode, fixed 300kHz-switch-ing frequency,
and synchronous buck controller. The JTMA8725A allows wide input voltage
that is either a single 5~12V or two supply voltage(s) for various applications.
A power-on-reset (POR) circuit monitors the VCC supply voltage to prevent
wrong logic controls. A built-in digital soft-start circuit prevents the output
voltages from over-shoot as well as limits the input current. An internal 0.8V
temperature-compensated reference voltage with high accuracy is designed to meet the requirement of low out-put voltage applications. The JTMA8725A provides excel-lent output voltage regulations against load current
variation.
The controller’s over-current protection monitors the out-put current by
using the voltage drops across the RDS(ON)of low-side MOSFET, eliminating
the need for a current sensing resistor that features high efficiency and low cost.
The JTMA8725A also integrates over-voltage protection (OVP) and under-voltage protection circuit which moni-tors the FB voltage to prevent the PWM output from over and under voltage.
The JTMA8725A is available in a simple SOP-8P package

二.产品特点(Features)
1.)Wide Operation Supply Voltage from 5V to 12V
2.)Power-On-Reset Monitoring on VCC
3.)Excellent Reference Voltage Regulations
- 0.8V Internal Reference
- ±1% Over-Temperature Range
4.)Integrated Soft-Start
5.)Automatic PSM/PWM Modes
6.)Voltage Mode PWM Operation with 90% (Max.)Duty Cycle
7.)Under-Voltage Protection
8.)Adjustable Over-Current Protection Threshold
- Sensing the RDS(ON) of Low-Side MOSFET
9.)Over-Voltage Protection Under-Voltage Protection
Simple SOP-8P Package
10.)Lead Free and Green Devices Available (RoHS Compliant)
三,应用范围 (Applications)
Graphic Cards
DSL, Switch HUB
Wireless Lan
Notebook Computer
Mother Board
LCD Monitor/TV

四.下载产品资料PDF文档

JTMA8725A