The JTMA8732 is a two-phases, voltage-mode and fixed frequen

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 JTMA8732 is a two-phases, voltage-mode and fixed
frequency buck controller.
二.产品特点(Features)
1.)Voltage-Mode Operation with Current Sharing
2.)Operate with 4.5V~13.2V Supply Voltage
3.)Support Single and Two-Phase Operations
4.)+/-2% Reference Voltage Accuracy Over Temperature
5.)Loss-Less Low Side MOSFET Ron Current Sensing
6.)Programmable PWM Switching Frequency from 100kHz to 800kHz
7.)Dynamic Output Voltage Adjustment TQFN4x4-24 Package
8.)Halogen and Lead Free Available (RoHS Compliant)

三,应用范围 (Applications)

四.下载产品资料PDF文档

JTMA8732

五,产品封装图 (Package)

六.电路原理图

七,功能概述
Over-Temperature Protection (OTP)
The over-temperature circuit limits the junction temperature of the JTMA8732. When the junction
UGTAE and LGATE low, allowing the devices to cool.The thermal sensor allows the converters to start a
soft-start process and regulate the output voltage again Junction Temperature (TJ) during continuous thermal
overload conditions, increasing the lifetime of the device.

OVP
The over-voltage protection (OVP) circuit monitors the FB (VFB) voltage to prevent the output from over-voltage.
When the VFB rises to 150% of the EAP voltage (VEAP),the JTMA8732 turns off high-side and turn on low-side
MOSFETs to sink output voltage (VOUT). As soon as theVFB falls below 125% of VEAP, the OVP comparator is
disengaged. The chip will restore its normal operation.

UVP
The under-voltage protection circuit monitors the voltage on FB (VFB) by Under-Voltage (UV) comparator to protect
the PWM converter against short-circuit conditions.When the VFB falls below the falling UVP threshold (50% (责任编辑：oumao18)