General Description

EC1745NN is a Synchronous Buck Circuit with two current sense pins suitable for many multioutput applications.

It is designed to allow for operating a wide supply voltage range from 4.5V to 30V.This IC can operate in both Constant Current (CC) and Constant Voltage (CV) modes.

EC1745NN operates as a Buck Circuit providing a wide range of outputs at Constant Voltage (CV) from 4.5V to 30V and the output current as high as 6A or above. It has a Constant Current (CC) mode so that output current can be set externally and at an accuracy of ±4%.

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

Features

◆ Vin: 4.5V to 30V
◆ Vout: 3V to 28V; typical at 5V
◆ Low Dropout Operation: Maximum Duty Cycle at 99.5%
◆ Precision CC/CV Mode Control
◆ Burst/PFM Mode for Increased Light Load Efficiency
◆ 2 outputs independent Constant Current setting
◆ Hiccup mode when output voltage below 50% normal output voltage
◆ Protection:
◆ NMOS peak current limit: accuracy：~20% Output short protection: reduce input current to less
than 20mA (RMS)
◆ Output FB OVP (125% VFB), only turn off High side MOS.
◆ Temperature shutdown (OTP)
◆ Adjustable Output Cable Resistance Compensation
◆ Switching Frequency: 375k+75k
◆ Integrated Power MOSFET
◆ QFN32L Package

Applications

◆ USB Power Supplies with PD
◆ High-Brightness Lighting
◆ General-Purpose DC/DC Application