General Description

EC1742-2COT is a DC/DC Buck Controller with 2 current sense pins suitable for many multi­output applications.

It is designed to allow for operating a wide supply voltage range from 7.5V to 40V.

It has both high­side and low­side drivers allowing synchronous configuration using two external power­NMOS.

This IC can operate in both Constant Current (CC) and Constant Voltage (CV) modes. EC1742­2COT operates as a DC/DC Buck Controller providing a wide range of outputs at Constant Voltage (CV) from 1.23V to 28V and the output current as high as 10A or above.

It has a Constant Current(CC) mode so that output current can be set externally and at a accuracy of +/­7%.

The current mode control makes feedback control have good line and load regulation with flexible external design.

There are 2 independent current limit control pins in addition to the CC setting for added flexibility of driving 2 separate loads.

Each of the current limits can be set by a sense resistor at 100mV across it. Of course, output peak current limit is working during normal operation..

Features

◆Vin: 7.5V to 40V
◆Vout: 3V to 28V; typical at 5V
◆CC/CV Mode Control
◆Burst/PFM Mode for Increased Light Load Efficiency
◆Hiccup mode 1­2S when SCP/OVP occur
◆Protection
NMOS peak current limit: accuracy：~20%
Output short protection: reduce input current to less than 20mA(RMS)
OVP(output Over­Voltage Protection)
Output FB short protection
Temperature shut down(OTP).
◆Adjustable Output Cable Resistance Compensation
◆Duty: 0~98%(Toff_min=100ns, Deadtime=25~35ns)
◆Switching Frequency: 150KHz(+/­25k)
◆Integrated MOSFET Driver.
◆OVP: When Vfb>120%*VREF, open discharge switch ( Vout1/2). Discharge current> 50mA
◆QFN­16 Package

Applications

◆Car Charger
◆High­Brightness Lighting
◆General­Purpose DC/DC Application