The JTMA8828 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 JTMA8828 is a single-phase, constant-on-time,synchronous PWM controller, which drives N-channel MOSFETs. The JTMA8828 steps down high voltage to generate low-voltage chipset or RAM supplies in notebook computers.
The JTMA8828 provides excellent transient response and accurate DC voltage output in either PFM or PWM Mode.In Pulse Frequency Mode (PFM), the JTMA8828 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 JTMA8828 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 JTMA8828 has a 1ms digital soft-start and built-in an integrated output discharge method 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 with controlled reverse inductor current.
The JTMA8828 is available in 10pin TDFN 3x3 package.
二.产品特点(Features)
Adjustable Output Voltage from +0.7V to +5.5V
- 0.7V Reference Voltage
- ±1% Accuracy Over-Temperature
Operates from an Input Battery Voltage Range of
+1.8V to +28V
Power-On-Reset Monitoring on VCC Pin
Excellent Line and Load Transient Responses
PFM Mode for Increased Light Load Efficiency
Selectable PWM Frequency from 4 Preset Values
Integrated MOSFET Drivers
Integrated Bootstrap Forward P-CH MOSFET
Adjustable Integrated Soft-Start and Soft-Stop
Selectable Forced PWM or Automatic PFM/PWM Mode
Power Good Monitoring
70% Under-Voltage Protection
125% Over-Voltage Protection
Adjustable Current-Limit Protection
- Using Sense Low-Side MOSFET’s RDS(ON)
Over-Temperature Protection
TDFN-10 3x3 Package
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

jtma8828

五,产品封装图 (Package)

六.电路原理图