The JTMA8720B is a voltage mode, fixed 300kHz switching freq

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 JTMA8720B is a voltage mode, fixed 300kHz switching frequency, synchronous buck converter. The JTMA8720B 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 soft-start
circuit prevents the output voltages from overshoot as well as limits the input current. An internal 0.8V tempera ture-compensated reference voltage with high accuracy is designed to meet the requirement of low output voltage applications. The JTMA8720B provides excellent out put voltage regulations against load current variation.The controller’s over-current protection monitors the out-put current by using the voltage drop across the RDS(ON) of low-side MOSFET, eliminating the need for a current sensing resistor that features high efficiency and low cost. In
addition, the JTMA8720B also integrates excellent protection functions: The over-voltage protection (OVP) , under voltage protection (UVP). OVP circuit which monitors the FB voltage to prevent the PWM output from over-voltage,and UVP circuit which monitors the FB voltage to prevent
the PWM output from under-voltage or short-circuit.
The JTMA8720B is available in SOP-8P and TDFN3x3-10 packages.

二.产品特点(Features)
1.)Wide 5V to 12V Supply Voltage
2.)Power-On-Reset Monitoring on VCC
3.)Excellent Output Voltage Regulations
0.8V Internal Reference
±1% Over-Temperature Range
4.)Integrated Soft-Start
5.)Voltage Mode PWM Operation with External Compensation
6.)Up to 90% Duty Ratio for Fast Transient Response
7.)Constant Switching Frequency 300kHz ±10%
8.)9V Driver Voltage for BOOT Supply with Internal Bootstrap Diode
9.)Drive Dual Low Cost N-MOSFETs with Adaptive Dead-Time Control
10.)50% Under-Voltage Protection
11.)125% Over-Voltage Protection
12.)Adjustable Over-Current Protection Threshold
Using the RDS(ON) of Low-Side MOSFET
13.)Shutdown Control by COMP
14.)Power Good Monitoring (TDFN-10 3mmx3mm Package Only)
SOP-8P and TDFN3x3-10 Packages
15.)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

JTMA8720