The JTMA8722 JTMA8722A JTMA872B JTMA8722C JTMA8722D is a vol

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 JTMA8722 JTMA8722A JTMA872B JTMA8722C JTMA8722D is a voltage mode, fixed 200kHz/300kHz/600kHz switching frequency, synchronous buck converter.The JTMA8722 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 over-
shoot as well as limits the input current. An internal 0.6V temperature-ompensated reference voltage with high accuracy is designed to meet the requirement of low out-put voltage applications. The JTMA8722 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 drop across the RDS (ON) of low-side MOSFET, eliminating the need for a cur-rent sensing resistor that features high efficiency and low cost. In addition, the JTMA8722 also integrates excel-lent protection functions. The over-voltage protection (OVP) , under-voltage protection (UVP). OVP circuit which moni-tors 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 JTMA8722 is available in SOP-8P 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
- 0.6V Internal Reference for JTMA8722/A/D
- 0.8V Internal Reference for JTMA8722B/C
- ±0.6% 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% for JTMA8722/B
- 200kHz ±10% for JTMA8722C
- 600kHz ±10% for JTMA8722A/D
8.）Integrated Bootstrap Forward P-CH MOSFET
9.）50% Under-Voltage Protection
10.）125% Over-Voltage Protection
11.）Adjustable Over-Current Protection Threshold
- Using the RDS(ON) of Low-Side MOSFET
12.）Shutdown Control by COMP SOP-8P Package
13.）Lead Free and Green Devices Available

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

JTM8722