iW628

Adaptive Voltage Position Monitor

Rev. 1.1

1 of 6

Product Summary

www.renesas.com

© 2022 Renesas Electronics

31-Jan-2022

1.0 Features

● Fast voltage undershoot detection

● “Normally-OFF” with <100μA cut-off current during

normal operation

● Wide operating voltage range from 2.5V to 15V at DRV

pin

● Built-in opto-coupler LED driver with minimum driving

current of 2mA

● Wide operating temperature range from -40°C to 150°C

2.0 Description

The iW628 is an adaptive voltage position monitor to detect

voltage undershoot. It can be used in Dialog’s primary-

side control systems to achieve ultra-low no-load power

consumption and fast dynamic load response. The iW628

operates at “normally-OFF” mode with negligible power

consumption during power supply normal steady state

operation, while monitoring dynamic load change through

a user-configurable voltage position sense pin. The iW628

eliminates loop compensation components at the secondary

side and it has a built-in opto-coupler LED driver to minimize

the bill of material cost.

Dialog’s innovative proprietary technology ensures that

power supplies designed with the iW628 and Dialog’s

primary-side controller can achieve less than 10mW no-

load power consumption in typical 5V2A AC/DC charger/

adapter designs and less than 20mW for 12V2A designs

while maintaining fast dynamic load response.

3.0 Applications

● Precision voltage reference

● AC/DC chargers/adapters

Figure 3.1: iW628 Typical Application Circuit (LED is on when VVPS < internal VREF)

U1

iW628

1

3

2

DRV

VPS

GND

R1

R2

V