The JTMA8728 is a single-phase, constant on-time, synchronou

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 JTMA8728 is a single-phase, constant on-time, synchronous PWM
controller, which drives N-channel MOSFETs. The JTMA8728 steps down high
voltage to generate low-voltage chipset or RAM supplies in notebook computers.
The JTMA8728 provides excellent transient response and accurate DC voltage
output in either PFM or PWM Mode.In Pulse Frequency Mode (PFM), the
JTMA8728 provides very high efficiency over light to heavy loads with loading-
modulated switching frequencies. In PWM Mode, the converter works nearly at
constant frequency for low-noise requirements. JTMA8728 is built in remote
sense function for applications that require remote sense.The JTMA8728 is
equipped with accurate positive current limit, output under-voltage, and output
over-voltage protections, perfect for NB applications. The Power-On-Reset
function monitors the voltage on VCC to prevent wrong operation during
power-on. The JTMA8728 has a 1ms digital soft start and built-in an integrated
output discharge device for soft stop. An internal integrated soft-start ramps up
the output voltage with programmable slew rate to reduce the start-up current.
A soft-stop function actively discharges the output capacitors.
The JTMA8728 is available in 16pin TQFN3x3-16 package respectively.
二.产品特点(Features)
1.)Adjustable Output Voltage from +0.6V to +3.3V
- 0.6V Reference Voltage
- ±0.6% Accuracy Over-Temperature
2.)Operates from An Input Battery Voltage Range of +1.8V to +28V
3.)Remote Feedback Sense for Excellent Output Voltage
4.)REFIN Function for Over-clocking Purpose from 0.5V~2.5V range
5.)Power-On-Reset Monitoring on VCC pin
6.)Excellent line and load transient responses
7.)PFM mode for increased light load efficiency
8.)Programmable PWM Frequency from 100kHz to 500kHz
9.)Selectable Forced PWM or automatic PFM/PWM mode
10.)Built in 30A Output current driving capabilityIntegrate MOSFET Drivers
11.)Integrated Bootstrap Forward P-CH MOSFET
12.)Adjustable Integrated Soft-Start and Soft-Stop Power Good Monitoring
13.)70% Under-Voltage Protection
14.)125% Over-Voltage Protection TQFN3x3-16 Package
15.)Lead Free and Green Devices Available

三,应用范围 (Applications)
Notebook
Table PC
Hand-Held Portable
AIO PC

四.下载产品资料PDF文档

JTMA8727

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