The JTMA8815 JTMA8816 is a single-phase, constant-on-time,s

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 JTMA8815 JTMA8816 is a single-phase, constant-on-time,synchronous PWM
controller, which drives N-channel MOSFETs. The JTMA8815 steps down high
voltage to generate low-voltage chipset or RAM supplies in notebook computers.
The JTMA8815 provides excellent transient response and accurate DC
voltage output in either PFM or PWM Mode.In Pulse Frequency Mode (PFM),
the JTMA8815 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 JTMA8815 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 and PVCC to
prevent wrong operation during power-on. The JTMA8815 has a 1.2ms 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 JTMA8815 is available in 14pin TSSOP, 14pin QFN and 16pin TQFN
packages respectively.

二.产品特点(Features)
Adjustable Output Voltage from +0.75V to +5.5V
- 0.75V 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 and PVCC Pin
Excellent Line and Load Transient Responses
PFM Mode for Increased Light Load Efficiency
Programmable PWM Frequency from 100kHz to 500kHz
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
TSSOP-14, QFN3.5x3.5-14, and TQFN3x3-16 Packages
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

JTMA7715

JTMA8816

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