Renesas lSL8273MEVAL1Z, ISL8273M User Manual

USER’S MANUAL

ISL8273M

VIN

VDD

EN

SDA

SCL

SALRT

VOUT

VSENP

VSENN

SYNC

DDC

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)

lSL8273MEVAL1Z

Evaluation Board

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™
responds to a transient load within a single switching cycle.

The ISL8273MEVAL1Z evaluation board is a 4.7inx 4.8in
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.

control (ASCR) architecture, which

UG036

Rev 0.00

August 7, 2015

Key Features

•VIN range of 4.5V to 14V, V

•Programmable V
limit, OTP/UTP, soft-start/stop, sequencing and

I

OUT

, margining, input and output UVP/OVP,

OUT

external synchronization

, V

• Monitor: V

IN

OUT

, I

OUT

frequency and faults

•ChargeMode™

control tunable with PMBus

• Mechanical switch for enable and power-good LED indicator

adjustable from 0.6V to 2.5V

OUT

, temperature, duty cycle, switching

Specifications

This board has been configured for the following operating
conditions by default:

= 5V to 12V

•V

IN

= 1V

•V

OUT

= 80A

•I

MAX

= 364kHz

•f

SW

• 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

References

ISL8273M datasheet

PART NUMBE R DESCRIPTION

ISL8273MEVAL1Z ISL8273M evaluation board, ZLUSBEVAL3Z

FIGURE 1. BLOCK DIAGRAM

adapter, USB cable

UG036 Rev 0.00 Page 1 of 17
August 7, 2015

lSL8273MEVAL1Z

INTERCONNECTS DDC AND
SYNC BETWEEN BOARDS

CONNECT TO ZLUSBEVAL3Z
DONGLE. FOR MULTIPLE
BOARD EVALUATION,
CONNECT TO PMBus DONGLE
OUT CONNECTION OF OTHER
BOARD

INTERCONNECTS DDC

BETWEEN BOARDS

TO DAISY CHAIN PMBus
CONNECTION

PGOOD LED

ENABLE SWITCH

VOUT REGULATION MONITOR

AND SYNC

RESISTOR PLACEHOLDERS

FIGURE 2. TOP SIDE

FIGURE 3. BOTTOM SIDE

UG036 Rev 0.00 Page 2 of 17
August 7, 2015

lSL8273MEVAL1Z

Recommended Equipment

• DC power supply with minimum 15V/40A sourcing capacity

• Electronic load capable of sinking current up to 80A

• Digital Multimeters (DMMs)

• Oscilloscope with higher than 100MHz bandwidth

Functional Description

The ISL8273MEVAL1Z provides all circuitry required to evaluate
the features of the ISL8273M. A majority of the features of the
ISL8273M, such as compensation-free ChargeMode™ control,
soft-start delay and ramp times, supply sequencing and voltage
margining are available on this evaluation board. For sequencing
evaluation, the board can be connected to any Intersil digital
module evaluation board that supports the DDC bus.

Figures 2

evaluation board.

and 3 show the board images of the ISL8273MEVAL1Z

Quick Start Guide

Pin-strap Option

ISL8273MEVAL1Z can be configured in pin-strap mode with
standard 1% 0603 resistors. PMBus interface is not required to
evaluate ISL8273M in pin-strap mode. Output voltage (V
switching frequency (f
input undervoltage protection (UVLO) threshold, ASCR gain and
residual, and device PMBus address can be changed by
populating recommended resistors at placeholders provided in
the evaluation board. By default, the evaluation board operates
in pin-strap mode and regulates at V
soft-start/stop delay time = 5ms, soft-start/stop ramp
time = -5ms to 5ms, UVLO = 4.5V, ASCR gain = 200, ASCR
residual = 90 and PMBus address = 28h. Follow these steps to
evaluate the ISL8273M in pin-strap mode.

1. Set ENABLE switch to “DISABLE”.

2. Connect Load to VOUT lug connectors (J7-J8 and J9-J10).

3. Connect power supply to VIN connectors (J5 and J6). Make
sure power supply is not enabled when making connection.

4. Turn power supply on.

5. Set ENABLE switch to “ENABLE”.

6. Measure 1V V
MONITOR” (J11).

7. Observe switching frequency of 364kHz at probe points
labeled “PHASE1” (TP10) and “PHASE2” (TP11).

8. To measure the module efficiency, connect the multimeter
voltage probes at probe points labeled “VIN” (TP1), “GND”
(TP2) and “VOUT” (TP12).

9. To change V
populate a 1% standard 0603 resistor at RVSET placeholder
location on bottom layer. Refer to the “Output Voltage
Resistor Settings” table in the ISL8273M
recommended values. By default, VOUT_MAX is set to 110%
of V

OUT

10. To change switching frequency, disconnect board from the
setup and populate a 1% standard 0603 resistor at the RFSET

OUT,

set by pin-strap resistor.

), soft-start/stop delay and ramp time,

SW

= 1V, fSW = 364kHz,

OUT

at probe point labeled “VOUT REGULATION

OUT

disconnect board from the setup and

datasheet for

OUT

),

placeholder location on bottom layer. Refer to the “Switching
Frequency Resistor Settings” table in the ISL8273M
datasheet for recommended values.

11. To change soft-start/stop delay and ramp time, disconnect
board from the setup and populate a 1% standard 0603
resistor at R6 placeholder location on bottom layer. Refer to
the “Soft Start/Stop Resistor Settings” table in the ISL8273M
datasheet for recommended values.

12. To change UVLO, disconnect board from the setup and
populate a 1% standard 0603 resistor at the R6 placeholder
location on bottom layer. Refer to the “UVLO Resistor Settings”
table in the ISL8273M
Notice that the UVLO programming shares the same pin with
soft-start/stop programming.

13. To change ASCR gain and residual, disconnect board from the
setup and populate a 1% standard 0603 resistor at the R7
placeholder location on bottom layer. Refer to the “ASCR
Resistor Settings” table and the design guide matrix in the

ISL8273M

datasheet for recommended values.

datasheet for recommended values.

PMBus Option

ISL8273MEVAL1Z can be evaluated for all features using the
provided ZLUSBEVAL3Z dongle and PowerNavigator™ evaluation
software. Follow these steps to evaluate theISL8273M with
PMBus option.

1. Install PowerNavigator™ software from the following Intersil
website: www.intersil.com/powernavigator

2. Set ENABLE switch to “DISABLE”.

3. Connect Load to VOUT lug connectors (J7-J8 and J9-J10).

4. Connect power supply to VIN connectors (J5 and J6). Make
sure power supply is not enabled when making connection.

5. Connect the ZLUSBEVAL3Z dongle (USB to PMBus™ adapter)
to the ISL8273MEVAL1Z board using the 6-pin male
connector labeled “PMBus DONGLE IN”.

6. Turn power supply on.

7. Connect supplied USB cable from computer USB to
ZLUSBEVAL3Z dongle.

8. Launch PowerNavigator™ software.

9. It is optional to load a predefined setup from a configuration
file using the PowerNavigator™ software. The ISL8273M
device on the board operates in pin-strap mode from factory
default, but the user may modify the operating parameters
through the evaluation software or by loading a predefined
set-up from a configuration file. A sample “

on page 7 is provided and can be copied to a notepad editor

to make desired changes. The default pin-strap
configurations will be overwritten if a user-defined
configuration file is loaded.

10. Set the ENABLE switch to “ENABLE”. Alternatively, the PMBus
ON_OFF_CONFIG and OPERATION commands may be used
from the PowerNavigator™ software to allow PMBus Enable.

11. Monitor and configure the ISL8273MEVAL1Z board using the
PMBus commands in the evaluation software. To store the
configuration changes, disable the module and use the
command STORE_USER_ALL. To restore factory default

Configuration File”

UG036 Rev 0.00 Page 3 of 17
August 7, 2015

lSL8273MEVAL1Z

VOUT

J16

47k

10m

J15

BSC010NE2LSI

TRANSIENT LOAD

PULSE INPUT

TRANSIENT LOAD

MONITOR





settings, disable the module and use the command
RESTORE_FACTORY and STORE_USER_ALL.

12. PowerNavigator™ tutorial videos are available on the Intersil
website. www.intersil.com/powernavigator

13. For sequencing via Digital-DC Bus (DDC) or to evaluate
multiple Intersil digital power products using a single
ZLUSBEVAL3Z dongle, the ISL8273M can be daisy chained
with other digital power evaluation boards. The PMBus
address can be changed by placing a 1% standard 0603
resistor at the R
Refer to the “SMBus Address Resistor Selection” table in the

ISL8273M

placeholder location on the bottom layer.

4

datasheet for recommended values.

Evaluation Board Information

If input voltage is less than 5.3V, tie the VCC test point directly to
VIN or to a separate 5V power supply for best efficiency.

If external synchronization is used, connect the SYNC test point to
the external clock. Note that the external clock signal should be
active before the module is enabled.

V

Transient Response Check

OUT

The ISL8273MEVAL1Z board has a built-in transient load test
circuit (see the schematic in Figure 4). A 100A N-Channel
MOSFET (Manufacturer PN: BSC010NE2LSI) is connected across
VOUT and PGND next to the remote voltage sensing location
(CVSEN). A 10mΩ current-sense resistor R
monitoring the drain-to-source current of the MOSFET. For a
transient load test, inject the gate drive pulse signal at J16. The
load current can be monitored through J15. Because the MOSFET
will operate in the saturation region instead of the linear region
when the gate turn-on signal is applied, the pulse width and duty
cycle of the gate signal must be limited small enough to avoid
MOSFET overheating (recommended duty cycle should be less
than 2%). The amplitude of the gate driver pulse voltage can be
adjusted to obtain a desired transient load current step size.

FIGURE 4. SCHEMATIC FOR TRANSIENT LOAD MEASUREMENT

is used for

54

Thermal Considerations and
Current Derating

Board layout is very critical in order to make the module operate
safely and deliver maximum allowable power. To work in the high
temperature environments and carry large currents, the board
layout needs to be carefully designed to maximize thermal
performance. To achieve this, select enough trace width, copper
weight and the proper connectors.

The ISL8273MEVAL1Z evaluation board is designed for running
80A at room temperature without additional cooling systems
needed. However, if the output voltage is increased or the board
is operated at elevated temperatures, then the available current
is derated. Refer to the derated current curves in the ISL8273M
datasheet to determine the maximum output current the
evaluation board can supply. JA is measured by inserting a
thermocouple inside the module to measure peak junction
temperature.

PCB Layout Guidelines

The ISL8273MEVAL1Z board layout has been optimized for
electrical performance, low loss and good thermal performance.

The key features of the ISL8273MEVAL1Z layout are:

• Large PGND planes and a separate SGND plane. The SGND
plane is connected to PGND on the second layer with a single
point connection. Multiple vias are used for small pins such as
J16, H16, K16, M5, M14, M17 and N5 to connect to inner
SGND or PGND layer.

• Ceramic capacitors between VIN and PGND, VOUT and PGND,
and bypass capacitors between VDD, VDRV and the ground
plane are placed close to the module to minimize high
frequency noise. Some output ceramic capacitors are placed
close to the VOUT pads in the direction of the load current path
to create a low impedance path for the high frequency inductor
ripple current.

• Large copper areas are used for power path (VIN, PGND, VOUT)
to minimize conduction loss and thermal stress. Multiple vias
are used to connect the power planes in different layers.

• Remote sensing traces are connected from the regulation
point to VSENP and VSENN pins. The two traces are placed in
parallel, to achieve tight output voltage regulation. The
regulation point is on the right side of the board in between the
VOUT power lugs and the PGND power lugs.

• Multiple vias are used to connect PAD14 and 16 (SW1 and
SW2) to inner layers for better thermal performance. The inner
layer SW1 and SW2 traces are limited in area and are
surrounded by PGND planes to avoid noise coupling. Caution
was taken that no sensitive traces, such as the remote sensing
traces, were placed close to these noisy planes.

• SWD1 (L3) and SWD2 (P10) pins are connected to SW1 and
SW2 pads respectively with short loop wires of 40mil width.
The wire width should be at least 20mils.

UG036 Rev 0.00 Page 4 of 17
August 7, 2015

UG036 Rev 0.00 Page 5 of 17

August 7, 2015

lSL8273MEVAL1Z

ISL8273MEVAL1Z Schematic

FIGURE 5. SCHEMATIC

RELEASED BY:

DRAWN BY:

SHEET

HRDWR ID

DATE:

DATE:

DATE:

TESTER

FILENAME:

MASK# REV.

DATE:ENGINEER:

TITLE:

UPDATED BY:

TIM KLEMANN

11/14/2014

ISL8273MEVAL1Z

SCHEMATIC

EVALUATION BOARD

ISL8273M 80A

TAO TAO

TIM KLEMANN

04/21/2015

A1

GND

TO SEQUEL

FROM PREQUELFROM PREQUEL

TO SEQUEL

GND

PGND TIED TO SGND

DISABLE

ENABLE

UNDER DUT

COMMUNICATION CONNECTION INTER-DEVICE CONNECTION

DDC

DDC

EN

PG

PG

PG

PHASE1

PHASE2

SA

SALRT

SALRT

SCL

SCL

SDA

SDA

SYNC

SYNC

UVLO

V25

VCC

VCC

VCC

VCC

VCC

VI2C

VIN

VMON

VOUT

VOUT

VOUT

VOUT

VR5

VR55

VR6

VSENN

VSENP

R3

4.75K

J15

R5

DNP

TP8

J10

C1

0.1UF

SW1

1

2

3

TP3

3
5

12

4
6

J2

1 2
3 4
5 6

TP6

3
5

12

4
6

J3

1 2
3 4
5 6

C3

470UF

R54

0.01

C6

22UF

100UF

C27

SCL
SDA
SALRT

VIN

VIN

VIN

PGND

NC

VDRV1

SA

VDRV1

NC
VSET

EN

VOUT

VSENP
VSENN

VOUT

NC
NC
PG

ASCR

VDRV

VDRV

SS/UVLO

CS

MGN

PGND

PGND

VCC

V25

VR5

VR6

SWD2

SWD1

SW1

PGND

SW2

PGND

PGND

PGND
PGND

PGND

VMON
SGND
SGND
SGND
SGND
SGND

DDC
SYNC

PGND

PGND

VR

VR55

NC

NC

VDD

U1

ISL8273MAIRZ

PAD6

M14

K16

J16

H16

C9

D4

C7

C8

C5

C6

G4

F4

D13

E4

C10

C11

C12

C13

PAD8

N6 PAD9

N16 PAD11

M1

G15 K14

L14

M13 L2

M10

PAD10

PAD12 R8

M5 R17

M17

N5 E14

D14

G14

D5

F15

E15

PAD15

PAD16

P11

PAD7

PAD4

PAD2

H3

H4

PAD13

PAD14

L3

PAD5

PAD3

PAD1

J8

3
5

12

4
6

J1

1 2
3 4
5 6

TP5

C23

100UF

R4

DNP

R57

47K

DNP

R6

100UF

C21

J7

J5

DNP

R7

RVSET

21.5K

C16

100UF

C8

10UF

C30

100UF

1.5K

R8

J16

47UF

C7

0

R12

C12

10UF

22UF

CVSEN

J6

22UF

C5

470UF

C18

470UF

C24

TP2

C13

100UF

TP4

0

R11

R13

200

R10

10K

RED

GRN

D1

I00000273

12

34

47UF

C26

C31

470UF

22UF

C4

100UF

C14

100UF

C28

12

J11

C17

10UF

470UF

C19

C9

10UF

470UF

C25

TP1

TP12

C2

22UF

C22

100UF

TP9

6.65K

R2

TP11

2N7002L

Q1

1

2

3

10UF

C10

C32

470UF

RFSET

17.8K

BSC010NE2LSI

U2

1

2

3

4 5

6

7

8

C29

100UF

R1

100K

TP10

C20

100UF

10UF

C11

J9

1.5K

R9

100UF

C15

TP7

3
5

12

4
6

J4

1 2
3 4
5 6

lSL8273MEVAL1Z

Bill of Materials

REFERENCE DESIGNATORS QTY MANUFACTURER MANUFACTURER PART DESCRIPTION

C1 1 PANASONIC ECJ-2VB1E104K CAP, SMD, 0805, 0.1µF, 25V, 10%, X7R, ROHS

CVSEN 1 JOHANSON

DIELECTRICS INC

C8, C9, C10, C11, C12, C17 6 VENKEL C1206X7R250-106KNE CAP, SMD, 1206, 10µF, 25V, 10%, X7R, ROHS

C13-C16, C20-C23, C27-C30 12 MURATA GRM31CR60J107ME39L CAP, SMD, 1206, 100µF, 6.3V, 20%, X5R, ROHS

C2, C4, C5, C6 4 MURATA GRM32ER71C226KE18L CAP, SMD, 1210, 22µF, 16V, 10%, X7R, ROHS

C7, C26 2 TDK C3225X5R1C476M CAP, SMD, 1210, 47µF, 16V, 20%, X5R, ROHS

C18, C19, C24, C25, C31, C32 6 SANYO 6TPE470MI CAP-POSCAP, LOW ESR, SMD, D4, 470µF, 6.3V, 20%,

C3 1 PANASONIC EEE-1EA471P CAP, SMD, 10mm, 470µF, 25V, 20%, ALUM.ELEC.,

J5, J6 2 JOHNSON

COMPONENTS

TP1-TP12 12 KEYSTONE 5005 CONN-COMPACT TEST PT, VERTICAL, RED, ROHS

J11, J15, J16 3 BERG/FCI 69190-202HLF CONN-HEADER, 1x2, RETENTIVE, 2.54mm, 0.230x0.120,

J2, J4 2 SAMTEC SSQ-103-02-T-D-RA CONN-SOCKET STRIP, TH, 2x3, 2.54mm, TIN, R/A, ROHS

J1, J3 2 SAMTEC TSW-103-08-T-D-RA CONN-HEADER, 2x3, BRKAWY, 2.54mm, TIN, R/A, ROHS

D1 1 LUMEX SSL-LXA3025IGC-TR LED, SMD, 3x2.5mm, 4P, RED/GREEN, 12/20MCD, 2V

U1 1 INTERSIL ISL8273MAIRZ IC-80A DIGITAL DC/DC MODULE, 42P, HDA, ROHS

Q1 1 ON SEMICONDUCTOR 2N7002LT1G TRANSISTOR-MOS, N-CHANNEL, SMD, SOT23, 60V,

U2 1 INFINEON

TECHNOLOGY

R4-R7 0 RESISTOR, SMD, 0603, 0.1%, MF, DNP-PLACE HOLDER

R11, R12 2 VENKEL CR0603-10W-000T RES, SMD, 0603, 0Ω, 1/10W, TF, ROHS

R10 1 KOA RK73H1JT1002F RES, SMD, 0603, 10k, 1/10W, 1%, TF, ROHS

R1 1 VENKEL CR0603-10W-1003FT RES, SMD, 0603, 100k, 1/10W, 1%, TF, ROHS

R8, R9 2 VENKEL CR0603-10W-1501FT RES, SMD, 0603, 1.5k, 1/10W, 1%, TF, ROHS

RFSET 1 PANASONIC ERJ-3EKF1782V RES, SMD, 0603, 17.8k, 1/10W, 1%, TF, ROHS

R13 1 VENKEL CR0603-10W-2000FT RES, SMD, 0603, 200Ω, 1/10W, 1%, TF, ROHS

RVSET 1 VENKEL CR0603-10W-2152FT RES, SMD, 0603, 21.5k, 1/10W, 1%, TF, ROHS

R57 1 YAGEO RC0603FR-0747KL RES, SMD, 0603, 47k, 1/10W, 1%, TF, ROHS

R3 1 VENKEL CR0603-10W-4751FT RES, SMD, 0603, 4.75k, 1/10W, 1%, TF, ROHS

R2 1 YAGEO RC0603FR-076K65L RES, SMD, 0603, 6.65k, 1/10W, 1%, TF, ROHS

R54 1 VISHAY WSL2512R0100FEA RES-CURR.SENSE, SMD, 2512, 0.01Ω, 1W, 1%, ROHS

SW1 1 C&K COMPONENTS GT13MCBE SWITCH-TOGGLE, THRU-HOLE, 5PIN, SPDT, 3POS, ON-OFF-

J7-J10 4 BERG/FCI KPA8CTP HDWARE,MTG, CABLE TERMINAL,6-14AWG, LUG and

6R3R15X226KV4E CAP, SMD, 0805, 22µF, 6.3V, 10%, X5R, ROHS

18mΩ, ROHS

380mA, ROHS

108-0740-001 CONN-JACK, BANANA-SS-SDRLESS, VERTICAL, ROHS

ROHS

115mA, ROHS

BSC010NE2LSI TRANSIST-MOS, N-CHANNEL, 8P, PG-TDSON-8, 25V, 100A,

ROHS

ON, ROHS

SCREW, ROHS

UG036 Rev 0.00 Page 6 of 17
August 7, 2015