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

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.
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)
Adjustable Output Voltage from +0.6V to +3.3V
- 0.6V Reference Voltage
- ±0.6% Accuracy Over-Temperature
Operates from An Input Battery Voltage Range of
+1.8V to +28V
REFIN Function for Over-clocking Purpose from
0.5V~2.5V range
Power-On-Reset Monitoring on VCC pin
Excellent line and load transient responses
PFM mode for increased light load efficiency
Programmable PWM Frequency from 100kHz to 500kHz
Built in 30A Output current driving capability
Integrate MOSFET Drivers
Integrated Bootstrap Forward P-CH MOSFET
Power Good Monitoring
70% Under-Voltage Protection
125% Over-Voltage Protection
TQFN3x3-16 Package
Lead Free and Green Devices Available (RoHS Compliant)
三,应用范围 (Applications)
Notebook
Table PC
Hand-Held Portable
AIO PC

四.下载产品资料PDF文档

JTMA8728

五,产品封装图 (Package)

六.电路原理图