1
ISL6446ADEMO1Z Dual Channel Step Down Regulator
User Guide
Introduction
The
ISL6446A
is a high performance Dual PWM + Single
Linear Controller. This device integrates complete control,
monitoring and protection functions for two synchronous buck
PWM controllers and one low power linear controller. Each
PWM channel is switched 180° out-of-phase for reduced input
ripple current and lower EMI.
The PWM controller uses voltage mode control for simple
output regulation. The output can be regulated from 0.8*V
IN
down to the 0.6V reference voltage. Switching frequency is
programmable from 100kHz to 2.5MHz, providing either a cost
optimized or compact power solution.
The ISL6446ADEMO1Z demo board is designed as an easy to
use, dual output, non-isolated power module featuring
synchronous buck function. It is well suited for any
applications that require high performance, small space and
low cost. The ISL6446ADEMO1Z output voltage is preset to
3.3V and 5V targeting ATX power supply applications. Each
channel is designed for up to 20A of output current. Total
power of the demo board is limited by thermal conditions.
Evaluation Board Features
• 12V input voltage
• 5V and +3.3V output
• 20A output current each channel
• Two-in-1 PWM controller with out-of-phase operation
• Voltage-mode PWM control
• Efficiency up to 94.9%
• Prebias start-up
• Undervoltage lockout
• Output overcurrent protection
• Over-temperature protection
• f
sw
set at 280kHz
• Simple dual layer board design
FIGURE 1. ISL6446ADEMO1Z REV B BOARD
FIGURE 2. ISL6446ADEMO1Z REV B BOARD BACKSIDE
Evaluation Board Specifications
SYMBOL
PARAMETER
TEST
CONDITIONS
MIN TYP MAX UNIT
V
IN
Input Range
Over I
O
range
10.8
13.2
V
V
OUT1
Output Range
Over I
O
range
4.8
5
5.2
V
I
OUT1
Output Current
From no load to
full load
0
20
A
V
OUT2
Output Range
Over I
O
range
3.1
3.3
3.5
V
I
OUT2
Output Current
From no load to
full load
0
20
A
Application Note 1822
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774
|
Copyright Intersil Americas LLC 2014, 2015. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
May 7, 2015
AN1822.1
