The JTMA7142 is a 3A synchronous-rectified Buck converter wi

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 JTMA7142 is a 3A synchronous-rectified Buck converter with integrated
70m Ω power MOSFETs. The JTMA7142, designed with a current-mode control
scheme,can convert wide input voltage of 4.3V to 14V to the output voltage
adjustable from 0.8V to VIN to provide excellent output voltage regulation.
For high efficiency over all load current range, the JTMA7142 is equipped
with an automatic Skip/PWM mode operation. At light load, the IC operates
in the Skip mode, which keeps a constant minimum inductor peak current,
to reduce switching losses. At heavy load, the IC works in PWM mode, which
inductor peak current is programmed by the COMP voltage, to provide high
efficiency and excel lent output voltage regulation.The JTMA7142 is also
equipped with power-on-reset,soft-start, soft-stop, and whole protections
(under-voltage,over-voltage, over-temperature, and current-limit) into a
single package. In shutdown mode, the supply current drops below 3µA.
This device, available in a 8-pin SOP-8 package, provides a very compact
system solution with minimal external components and PCB area.

二.产品特点(Features)
Wide Input Voltage from 4.3V to 14V
Output Current up to 3A
Adjustable Output Voltage from 0.8V to V IN
- ±2% System Accuracy
70mΩ Integrated Power MOSFETs
High Efficiency up to 95%
- Automatic Skip/PWM Mode Operation
Current-Mode Operation
- Easy Feedback Compensation
- Stable with Low ESR Output Capacitors
- Fast Load/Line Transient Response
Power-On-Reset Monitoring
Fixed 500kHz Switching Frequency in PWM Mode
Built-In Digital Soft-Start and Soft-Stop
Current-Limit Protection with Frequency Foldback
123% Over-Voltage Protection
Hiccup-Mode 50% Under-Voltage Protection
Over-Temperature Protection
<3µA Quiescent Current in Shutdown Mode
Small SOP-8 Package
Lead Free and Green Devices Available
(RoHS Compliant)

三,应用范围 (Applications)
OLPC, UMPC
Notebook Computer
Handheld Portable Device
Step-Down Converters Requiring High Efficiency
and 3A Output Current

四.下载产品资料PDF文档

jtma7142

jtma7145

五,产品封装图 (Package)

六.电路原理图

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