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Application Note 1521
ISL6445 Evaluation Board User Guide
Hardware Description
The ISL6445EVAL3Z evaluation board is designed to
demonstrate the performance of the ISL6445.
The ISL6445 is a high-performance, dual-output PWM
controller optimized for converting wall adapter, battery
or network intermediate bus DC input supplies into the
system supply voltages required for a wide variety of
applications. Each output is adjustable down to 0.8V. The
two PWMs are synchronized 180° out-of-phase reducing
the RMS input current and ripple voltage.
ISL6445 Reference Design
The ISL6445 evaluation board illustrates the operation of
the IC. The design criteria is listed in Table 1.
TABLE 1. DESIGN CRITERIA
V IN
5.6V TO 24V
FIGURE 1. POWER AND LOAD CONNECTIONS FOR
5.6V TO 24V INPUT VOLTAGE
PARAMETERS
Output voltage (V OUT1 )
Output current (I OUT1 )
Output voltage (V OUT2 )
Output current (I OUT2 )
PACKAGE
3.3V
3A
2.5V
3A
V IN
5V±10%
Power and Load Connections
If using an input supply ranging from 5.6V to 24V,
connect the supply to VIN (P1) and GND (P2) posts as
shown in Figure 1. ISL6445 has an internal +5V linear
regulator which can be used to bias the IC.
When using a 5V ±10% input supply, connect the
negative polarity to GND (P2) post and connect the
positive polarity of the power supply to both V IN (P1)
post and the VCC5 (TP1) post. This will disable the
internal LDO and the chip will be powered by the input
power supply (see Figure 2).
FIGURE 2. POWER AND LOAD CONNECTIONS FOR
5V ±10% INPUT VOLTAGE
Test-point and Terminals Descriptions
TABLE 2. ISL6445EVAL3Z TEST POINT DESCRIPTION
TEST POINTS
AND TERMINALS SIGNALS
CAUTION: Ensure that the +5V terminal is not
connected to when applying voltages >7V. This
can damage the IC .
TP1
TP2
TP3
P1
P2
P3
P4
P5
P6
PGOOD
VCC5
GND
VIN
GND
VOUT2
GND
VOUT1
GND
January 15, 2010
AN1521.0
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2010. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
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