USER’S MANUAL
UG036
Rev 0.00
August 7, 2015
lSL8273MEVAL1Z
Evaluation Board
UG036 Rev 0.00
Page 1 of 17
August 7, 2015
Description
The
ISL8273M
is a 80A step-down DC/DC power supply
module with an integrated digital PWM controller, dual-phase
synchronous power switches, inductors and passives. Only
input/output capacitors and minimal passives are needed to
finish the design. 80A of continuous output current can be
delivered without a need of airflow or heatsink. The ISL8273M
uses ChargeMode™
control (ASCR) architecture, which
responds to a transient load within a single switching cycle.
The ISL8273MEVAL1Z evaluation board is a 4.7inx4.8in
8-layer FR4 board with 2oz. copper on all layers. This
evaluation board comes with placeholders for pin-strap
resistor population to adjust output voltage, switching
frequency, soft-start/stop timing and input UVLO threshold,
ASCR gain and residual parameters and device PMBus™
address. More configurations, such as sequencing, Digital-DC™
(DDC) bus configuration and fault limits can be easily
programmed or changed via PMBus compliant serial bus
interface.
The optional ZLUSBEVAL3Z (USB to PMBus adapter) is
provided with this evaluation board, which connects the
evaluation board to a PC to activate the PMBus
communication interface. The PMBus command set is
accessed by using the PowerNavigator™ evaluation software
from a PC running Microsoft Windows. The ISL8273MEVAL1Z
can operate in pin-strap mode without needing the
ZLUSBEVAL3Z adapter or PMBus communication.
References
ISL8273M
datasheet
Key Features
• V
IN
range of 4.5V to 14V, V
OUT
adjustable from 0.6V to 2.5V
• Programmable V
OUT
, margining, input and output UVP/OVP,
I
OUT
limit, OTP/UTP, soft-start/stop, sequencing and
external synchronization
• Monitor: V
IN
, V
OUT
, I
OUT
, temperature, duty cycle, switching
frequency and faults
• ChargeMode™
control tunable with PMBus
• Mechanical switch for enable and power-good LED indicator
Specifications
This board has been configured for the following operating
conditions by default:
• V
IN
= 5V to 12V
• V
OUT
= 1V
• I
MAX
= 80A
• f
SW
= 364kHz
• Peak efficiency: >90% at 70% load
• Output ripple: <10mV
P-P
• ASCR gain = 200, ASCR residual = 90
• On/off delay = 5ms; On/off ramp time = 5ms
Ordering Information
PART NUMBER
DESCRIPTION
ISL8273MEVAL1Z
ISL8273M evaluation board, ZLUSBEVAL3Z
adapter, USB cable
FIGURE 1. BLOCK DIAGRAM
ISL8273M
VIN
VDD
EN
SDA
SCL
SALRT
VOUT
VSENP
VSENN
SY
N
C
DD
C
V
IN
5V TO 12V
PG
INTER-DEVICE CONNECTION
(OPTIONAL)
PMBus DONGLE
CONNECTION
(OPTIONAL)
V
OUT
1V
(CAN BE ADJUSTED
0.6V TO 2.5V)
