Intersil ISL73847SEHEV2Z User manual

Evaluation Board Manual
R34UZ0010EU0100 Rev.1.00 Page 1
Nov 21, 2022 © 2022 Renesas Electronics
The ISL73847SEHEV2Z evaluation board
benchmarks the performance of the ISL73847SEH
dual-phase buck controller. The evaluation board is
optimized for a 4.5V to 15V input operation to
generate a 50A max, 1V output. Input and output
connections, test points, and jumper settings on the
board provide customers an easy-to-use evaluation
platform for point-of-load power applications.
Specifications
▪Buck Power Supply input (PVIN): 4.5V to 15V
▪Controller Analog Supply input (VDD): 4.5V to 19V
▪Preset output voltage: 1V
▪Preset Switching Frequency: 500kHz
▪Maximum dual-phase output current: 50A
▪Maximum single-phase output current: 25A
▪Preset droop regulation
Features
▪Power-Good LED indicator
▪On-board transient load current generator
▪Integrated LDO (VCC)
▪External Clock Synchronization (SYNCI & SYNCO)
▪Droop regulation set by a single resistor
Figure 1. ISL73847SEHEV2Z Block Diagram
Half Bridge
Driver
ISL73041SEH
VFB+
VFB-
COMP
FLT
PWM1
SLP
ISEN1+
ISEN1-
ISEN2+
ISEN2-
GND
SYNC-I
SYNC-O
PWM2
IMON
DROOP
FS
VREF
SS
VDD
Half Bridge
Driver
ISL73041SEH
VDD
FLT
FLT
PVIN
VOUT
100kΩ
FPGA
LOAD
SLOPE
GEN
CSA1
+
+
-
VCC
UVLO
LDO
VDD
EN
CSA2
OSC
Σ
600mV
PWM
EA
3.6mS
20µA/50mV
20µA/50mV
+
-
I
DROOP
VREF
VFB+
VCC
CurrentFeedback
RemoteVoltageFeedback
680Ω
604Ω
22µF
0.1µF
100nF
22µF
1µF
638µF
0.22µH
30.1Ω
2mΩ
0.22µH 2mΩ
680pF
680pF
30.1Ω
10kΩ
94.2kΩ
4.22kΩ
330pF
8.2nF
22nF
56nF
PVIN
5.28mF
3.24kΩ
4.99kΩ
100pF
34.8kΩ22µF
ISL73847SEHEV2Z

R34UZ0010EU0100 Rev.1.00 Page 2
Nov 21, 2022
ISL73847SEHEV2Z Evaluation Board Manual
Contents
1. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Operating Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Quick-Start Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.3 Changing the Switching Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.4 External Clock Synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.5 Clock Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.6 Soft-Start Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.7 Droop Regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.8 IMON . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.9 Enabling/Disabling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.10 Using the On-Board Load Transient Generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2. Board Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1 Schematic Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2 Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.3 Board Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3. Typical Performance Graphs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4. Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5. Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

R34UZ0010EU0100 Rev.1.00 Page 3
Nov 21, 2022
ISL73847SEHEV2Z Evaluation Board Manual
1. Functional Description
1.1 Operating Range
The ISL73847SEHEV2Z evaluation board requires two supply rails to operate properly. One for the ISL73847SEH
controller analog supply input (VDD) and one for the on-board buck power supply input (PVIN). The VDD rail
accepts an input voltage range of 4.5V to 19V. The PVIN should be set from 4.5V to 15V. The buck regulator
circuit is preset for a 1V output voltage and a switching frequency of 500kHz with a 0.22µH output inductor and
2.64mF output capacitance per phase with the option of being synchronized to an external clock using SYNCI.
1.2 Quick-Start Guide
See Table 1 to get an overview of all the default jumper settings and their different configurations.
1. Ensure JP1, JP4, and JP5 is connected to position 2-3.
2. Ensure JP2 and JP3 is removed.
3. Ensure JP6 is connected.
4. Apply a 4.5V to 15V voltage to PVIN metal banana plug connectors as shown in Figure 2.
5. Apply a 4.5V to 19V voltage to the VDD banana connectors as shown in Figure 2.
6. If required, a resistor or electronic load can be connected to the VOUT metal banana plug connectors as shown
in Figure 2. If using an electronic load, you can add 4w sense lines on the TP29 test jumper.
Figure 2. ISL73847SEHEV2Z Board Setup
PVIN
Supply
VDD
Supply
Electronic
Load
External
SYNC-I
Input
Transient Generator
Pulse Input
Used for remote sense
or monitoring VOUT.

R34UZ0010EU0100 Rev.1.00 Page 4
Nov 21, 2022
ISL73847SEHEV2Z Evaluation Board Manual
1.3 Changing the Switching Frequency
The ISL73847SEHEV2Z is configured for a 500kHz switching frequency by a JP1 connecting a 94.2kΩpull-down
resistor (R2) on the FS pin. The evaluation board includes a 0.22µH inductor and an array of output bypass
capacitors for a 2.64mF output capacitance per phase, which makes up the LC filter. If you need to select a
different switching frequency, see Figure 3 for selecting the appropriate R2value on FS. An alternate on-board
configuration is to connect JP1 to position 1-2, which ties FS to VCC. This setting defaults the switching frequency
to 500kHz. For more information on the FS pin, refer to the ISL73847SEH datasheet.
Table 1. Default Jumper Settings and Alternate Configurations
Jumper Function/Description Default Configuration Alternate Configuration
JP1 Sets the frequency of the
ISL73847SEH Controller
Jumper in 2-3 position connects a
94.2kΩpull-down from FS to GND,
which sets the oscillator frequency to
1MHz.
Jumper in 1-2 position ties FS to
VCC, which sets the oscillator
frequency to 1MHz.
JP2
Powers the ISL70040SEH FET driver,
which is part of the load transient
generator circuit
Remove Jumper to disconnect VDD and
disable the FET driver.
Populate Jumper to connect VDD
to enable the FET driver.
JP3 Sets the output of the SYNCO pin
Populate Jumper and connect a 100kΩ
pull-down from SYNC-O to GND (R4),
and remove the SYNC-O to VCC pull-up
(R59). This outputs the internal oscillator
or SYNC-l external oscillator.
Populate Jumper and remove the
100kΩpull-down from SYNC-O to
GND (R4), and populate the
SYNC-O to VCC pull-up (R59) with
a 100kΩ. This outputs 1/2 of the
frequency of the internal oscillator
or SYNC-l external oscillator.
JP4 Disables the phase 1 output of the
buck regulator
Jumper in 2-3 position ties PWM of the
ISL73041SEH FET Driver (U2) to PWM1
of the ISL73847SEH controller, which
enables phase 1 output of the buck
regulator.
Jumper in 1-2 position ties PWM of
the ISL73041SEH FET Driver (U2)
to VCC, which disables phase 1
output of the buck regulator.
JP5 Disables the phase 2 output of the
buck regulator
Jumper in 2-3 position ties PWM of the
ISL73041SEH FET Driver (U3) to PWM2
of the ISL73847SEH controller, which
enables phase 2 output of the buck
regulator.
Jumper in 1-2 position ties PWM of
the ISL73041SEH FET Driver (U3)
to VCC, which disables phase 2
output of the buck regulator.
JP6 Disables or enables LED lights driven
by PG
Populate jumper to enable LED PG
indication.
Remove Jumper to disable LED
PG indication.
Figure 3. RFS vs Frequency
0
50
100
150
200
250
0 500 1000 1500 2000 2500 3000
3500
FS Resistor (kΩ)
Oscillator Frequency (kHz)

R34UZ0010EU0100 Rev.1.00 Page 5
Nov 21, 2022
ISL73847SEHEV2Z Evaluation Board Manual
1.4 External Clock Synchronization
If you need to synchronize the buck switching frequency to an external clock, a SMA female connector (BNC1) is
available on the board. TP3 can be used to monitor the external clock signal on SYNC-I. For the external oscillator
to be used in place of the internal oscillator, the external oscillator frequency needs to be 15% greater than the
internal oscillator frequency. For more information on the external clock synchronization, refer to the
ISL73847SEH datasheet.
1.5 Clock Output
The SYNC-O pin is configured to output the internal oscillator frequency (1MHz) through a jumper (JP2)
connecting a 100kΩpull-down (R4) to GND. The SYNC-O pin can be monitored using the TP26 test jumper.
Note: If you are using an external clock signal on the SYNC-I pin, that external clock is output on SYNC-O in place
of the internal clock if the external oscillator frequency is 15% greater than the internal oscillator frequency. If you
need to output half of the internal or external oscillator frequency, move the 100kΩresistor from R4to R59. For
more information on SYNC-O, refer to the ISL73847SEH datasheet.
1.6 Soft-Start Adjustment
The ISL73847SEHEV2Z is configured for a 2ms soft-start time by a 22nF bypass capacitor (C2) connected to the
SS pin. The SS time can be adjusted from 2ms to 200ms by changing the C2capacitor. If you need to select a
different soft-start time use Equation 1 below which shows how to calculate the capacitance given the desired
soft-start time. For more information on SS, refer to the ISL73847SEH datasheet.
where:
▪CSS is the soft-start capacitance in Farads
▪tSS is the required soft-start time in seconds
▪VREF is the reference voltage, which is nominally 0.6V
1.7 Droop Regulation
The ISL73847SEHEV2Z is configured to minimize peak-to-peak transient response excursions by using a 604Ω
resistor (R1) connected between VREF and DROOP pin. If droop regulation is not needed, replace the 604Ωwith
a 0Ωresistor to short VREF and DROOP pin together. For more information on the droop regulation, refer to the
ISL73847SEH datasheet.
1.8 IMON
The ISL73847SEHEV2Z is configured to monitor the average current though the inductor as a voltage on the
IMON pin. A 10kΩpull-down resistor (R10) is connected to this pin. TP29 test jumper is provided to monitor the
IMON pin voltage. If required, a bypass capacitor (C9) can be added in parallel to R10 to improve the averaging.
For more information on the IMON pin, refer to the ISL73847SEH datasheet.
1.9 Enabling/Disabling
The ISL73847SEHEV2Z is configured to automatically enable when VDD reaches a certain voltage on power-up
by 4.99kΩresistor (R6) connected between EN and VDD. To disable the part in this default configuration, apply 0V
or ground to the TP8 test point. To disable automatic enabling on power-up and to control EN by an external
supply, remove R6and connect another external supply to TP8. For more information on the enabling and
disabling the controller, refer to the ISL73847SEH datasheet.
(EQ. 1)
CSS
tSS 15– 10
VREF
----------------------------------=

R34UZ0010EU0100 Rev.1.00 Page 6
Nov 21, 2022
ISL73847SEHEV2Z Evaluation Board Manual
1.10 Using the On-Board Load Transient Generator
An on-board load transient generator is made available to evaluate the buck-regulator output. The circuit is shown
in Figure 8. The circuit comprises an NMOS FET load switch driven by a Renesas ISL70040SEH Rad-Hard, GAN
FET driver requiring 0-5V logic signals. Logic HIGH drives the load ON and logic LOW turns the load OFF. The
load current is preset by six parallel 220mΩresistors on each output phase (25A) for a total load current of 50A.
Complete the following steps to properly set-up and operate the load transient generator.
1. Connect an external pulse generator to the on-board SMA connector (BNC2).
2. To monitor the pulse generator signal, use the TP37 test jumper.
3. Connect jumper to JP2 to connect VDD to power the FET driver.
4. Monitor the output voltage using TP29.
2. Board Design
Figure 4. ISL73847SEHEV2Z Evaluation Board (Top)
Figure 5. ISL73847SEHEV2Z Evaluation Board (Bottom)

R34UZ0010EU0100 Rev.1.00 Page 7
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ISL73847SEHEV2Z Evaluation Board Manual
2.1 Schematic Diagrams
Figure 6. ISL73847SEHEV2Z Schematic (Page 1)
UPDATED BY:
TITLE:
DATE:
REV.MASK#
FILENAME
TESTER
DATE: DATE: DATE:
HRDWR ID
SHEET
DRAW N BY:
RELEASED BY:
ENGINEER:
B
01/11/2022
EVALUATION BOARD
ISL73847SEH
SCHEMATIC
TIM KLEMANN
THEJU BERNARD
TO INPUT CAPS
FROM INPUT CAPS
TO OUTPUT CAPS
ISEN1-
TO OUTPUT CAPS
ISEN2-
IN
IN
IN
OUT
IN
OUT
IN IN
OUT
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
OUT
OUT
OUT OUT
R22
0
21
TP15
1 2
JP3
1 2
R70
4.99K
R19
10K
21
TP11
1 2
BA1
Default
571-0500
1A
1B
R50
0
C13
1UF
R62
30.1
C16
1UF
TP13
21 TP3
12
R54
0
C69
0.01UF
TP8
21
TP18
12
C10
1UF
R69
3.24K
21
TP21
12
21
TP5
12
21
TP24
1 2
EP2
EP1 AVCC RDL
RDU
FLTB
PWM
EN
BOOT
UGH
UGL PHS LGH LGL EP4
EP3
PGND
PVCC
FB
VDD
U3
ISL73041SEHVL
EP2 EP1 EP4
EP3
1
2
3 4 5 6
7
8
9
10
11 12 13 14
15
16
C9
OPEN
R49
0
C12
1UF
C7
0.1UF
21
TP17
1 2
TP36
C5
22UF
R53
0
R18 3.65K
21
TP26
1 2
C6
0.056UF
21
TP20
12
R7
0
R61
100K
EP2
EP1 AVCC RDL
RDU
FLTB
PWM
EN
BOOT
UGH
UGL PHS LGH LGL EP4
EP3
PGND
PVCC
FB
VDD
U2
ISL73041SEHVL
EP2 EP1 EP4
EP3
1
2
3 4 5 6
7
8
9
10
11 12 13 14
15
16
R48
0
R16 2.1K
R59
DNP
R56 0.002
21
TP25
1 2
TP35
R5
4.99K
S
G
SUB
D
Q2
ISL70020SEHML
1 2 3
4
R17 3.65K
S
G
SUB
D
Q4
ISL70020SEHML
1 2 3
4
C32
1UF
21
TP2
12
R24
0
R15 2.1K
Q9
2N7002-7-F
1
2 3
R55 0.002
TP34
U1
ISL73847SEHVF
1
VDD
2
SYNC-I
3
SYNC-O
4
VCC
5
VCC
6
FS
7
SS
8
COMP
9
VREF
10
DROOP
11
VFB-
12
VFB+
13
PWM2
14
PG
15
ISEN2+
16
ISEN2-
17
IMON
18
FLT
19
SLOPE
20
GND
21
ISEN1-
22
ISEN1+
23
EN
24
PWM1
S
G
SUB
D
Q3
1 2 3
4
R47
0
C86
100PF
R9
680
L2
0.22UH
1 2
TP1
R23
0
R14
2.1K
C61
680PF
TP33
21
TP4
12
R1
604
S
G
SUB
D
Q8
ISL70020SEHML
1 2 3
4
C68
0.01UF
R6
4.99K
R52
0
21
TP22
1 2
C17
1UF
R10
10K
R28 0
R13
2.1K
21
TP7
12
C60
680PF
TP32
R3
4.22K
S
G
SUB
D
Q1
ISL70020SEHML
1 2 3
4
R26
10K
21
TP9
12
C1
8200PF
S
G
SUB
D
Q7
ISL70020SEHML
1 2 3
4
JP5
1 2 3
R51
0
21
TP6
12
C15
0.1UF
21
TP12
12
C4
0.1UF
R27 0
R11
34.8K
R4
100K
21
TP23
1 2
R25
10K
TP10
BNC1
1
2
3
JP4
1 2 3
R2
94.2K
R30
0
RED
GRN
PG_LED1
12
34
L1
0.22UH
1 2
21
TP16
1 2
C3
330PF
S
G
SUB
D
Q6
1 2 3
4
R21
0
C11
1UF
R33
680
R8
0
R60
100K
JP6
1 2
21
TP19
1 2
R20
10K
R12
4.99K
BA2
571-0100
Default
1A
1B
R29
0
C8
1UF
R63
30.1
C14
0.1UF
21
TP14
12
C2
0.022UF
S
G
SUB
D
Q5
ISL70020SEHML
1 2 3
4
JP1
1
2
3
AVCC1
AVCC2
BOOT1
BOOT2
COMP
DROOP
EN
FLTB
FS
FS
GND
GND
IMON
ISEN1+ ISEN2+
PG
PHS1
PHS1
PHS2
PHS2
PVIN
PVIN
PWM1
PWM2
SLOPE
SS
SYNC-O
UGATE1
UGATE2
UNNAMED_1_ISL70020SEH_I355_4
UNNAMED_1_ISL70020SEH_I 357_4
UNNAMED_1_ISL70020SEH_I429_4
UNNAMED_1_ISL70020SEH_I 430_4
UNNAMED_1_ISL70020SEH_I 431_4
UNNAMED_1_ISL70020SEH_I 432_4
UNNAMED_1_ISL73041SEH_I199_1
UNNAMED_1_ISL73041SEH_I 199_11 UNNAMED_1_ISL73041SEH_I 199_12 UNNAMED_1_ISL73041SEH_I 199_14
UNNAMED_1_ISL73041SEH_I 199_15
UNNAMED_1_ ISL7 3041 SEH_I1 99_2
UNNAMED_1_ISL73041SEH_I199_4 UNNAMED_1_ISL73041SEH_I199_5
UNNAMED_1_ISL73041SEH_I 199_8 UNNAMED_1_I SL73041SEH_I199_9
UNNAMED_1_ISL73041SEH_I277_1
UNNAMED_1_ISL73041SEH_I 277_11 UNNAMED_1_ISL73041SEH_I 277_12 UNNAMED_1_ISL73041SEH_I 277_14
UNNAMED_1_ ISL73041SEH_I277_15
UNNAMED_1_ISL73041SEH_I 277_2
UNNAMED_1_ISL73041SEH_I277_4 UNNAMED_1_ISL73041SEH_I277_5
UNNAMED_1_ISL73041SEH_I 277_8 UNNAMED_1_I SL73041SEH_I277_9
UNNAMED_1_ISL73847SEH_I16_2
UNNAMED_1_JU MPER2_I453_IN1
UNNAMED_1_JU MPER2_I463_IN2
UNNAMED_1_JUMPER3_I378_IN3
UNNAMED_1_NCHANNEL_I347_D
UNNAMED_1_POWERI ND_I212_B
UNNAMED_1_POWERI ND_I253_B
UNNAMED_1_SMCAP_I 22_A
UNNAMED_1_SMRES_I342_A
UNNAMED_1_SMRES_I345_A
UNNAMED_1_SMRES_I346_A
VCC
VCC
VCC
VCC
VDD
VDD
VDD
VDD
VDD
VFB+
VFB+
VFB-
VFB-
VFB-
VFB- VOUT
VREF

R34UZ0010EU0100 Rev.1.00 Page 8
Nov 21, 2022
ISL73847SEHEV2Z Evaluation Board Manual
Figure 7. ISL73847SEHEV2Z Schematic (Page 2)
FROM OUTPUT
FROM OUTPUT
1V 50A
12V - 15V
TO TRANSIENT LOAD BANK1
TO TRANSIENT LOAD BANK2
TO INPUT
TO INPUT
OUT
OUT
IN
IN
OUT
OUT
C47
220UF
12
C46
100UF
12
C49
220UF
12
C48
100UF
12
C51
220UF
12
C50
100UF
12
C53
220UF
12
C52
100UF
12
C55
220UF
12
C28
4.7UF
C54
100UF
12
C26
4.7UF
C57
220UF
12
C56
100UF
12
C59
220UF
12
C36
4.7UF
C58
100UF
12
C30
4.7UF
C63
220UF
12
C75
4.7UF
C62
100UF
12
C18
1000PF
TP31
C74
4.7UF
C64
220UF
12
C19
1000PF
C65
220UF
12
C20
1000PF
C66
220UF
12
C76
4.7UF
C67
220UF
12
C77
4.7UF
2 1
TP27
1 2
C21
1000PF
TP28
C22
0.01UF
C70
220UF
12
C80
4.7UF
C71
220UF
12
C81
4.7UF
TO PIN 2
TIE PIN 1
MUST
TERM2
B2C-PCB
1 2
C23
0.01UF
TO PIN 2
TIE PIN 1
MUST
TERM1
B2C-PCB
1 2
C24
0.01UF
C73
220UF
12
C82
4.7UF
C72
220UF
12
C83
4.7UF
C25
0.01UF
2 1
TP29
1 2
C84
4.7UF
C85
4.7UF
TO PIN 2
TIE PIN 1
MUST
TERM4
B2C-PCB
1 2
C27
220UF
12
TO PIN 2
TIE PIN 1
MUST
TERM3
B2C-PCB
1 2
C29
220UF
12
C78
4.7UF
C31
220UF
12
C37
220UF
12
C79
4.7UF
C39
220UF
12
C38
100UF
12
C41
220UF
12
C40
100UF
12
C43
220UF
12
C42
100UF
12
C45
220UF
12
C44
100UF
12
PVIN
PVIN
VOUT
VOUT

R34UZ0010EU0100 Rev.1.00 Page 9
Nov 21, 2022
ISL73847SEHEV2Z Evaluation Board Manual
Figure 8. ISL73847SEHEV2Z Schematic (Page 3)
TRANSIENT TEST CIRCUIT
FROM CAPACITORS BANK 1
FROM CAPACITORS BANK 2
IN
IN IN
BNC2
1
2
3
JP2
1 2
C33
10UF
C34
0.1UF
R31
DNP
21
TP37
12
VDRV OUTL
VSS INB VDD
OUTHIN VSSP
U4
ISL70040SEHVL
1 2 3 4 5
6 7 8
C35
10UF
R58
10
R57
10
R34
10
R32
10
S
G
SUB
D
U6
ISL70020SEHML
1 2 3
4
S
G
SUB
D
U5
ISL70020SEHML
1 2 3
4
R36
0.22
R35
0.22
R38
0.22
R37
0.22
R40
0.22
R39
0.22
R42
0.22
R41
0.22
R44
0.22
R43
0.22
R46
0.22
R45
0.22
21
TP38
12
21
TP30
12
C88
0.1UF
C87
0.1UF
U5_DRAIN
U6_DRAIN
UNNAMED_4_ISL70020SEH_I17_4 UNNAMED_4_ISL70020SEH_I32_4
UNNAMED_4_ISL70040SEH_I18_PIN1 UNNAMED_4_ISL70040SEH_I18_PIN2
UNNAMED_4_ISL70040SEH_I18_PIN6 UNNAMED_4_ISL70040SEH_I18_PIN7 UNNAMED_4_ISL70040SEH_I18_PIN8
VDD
VOUT VOUT
VOUT VOUT

R34UZ0010EU0100 Rev.1.00 Page 10
Nov 21, 2022
ISL73847SEHEV2Z Evaluation Board Manual
2.2 Bill of Materials
Qty Reference Designator Description Manufacturer Manufacturer Part
1
PWB-PCB,
ISL73847SEHEV2Z, REVB,
ROHS
Imagineering Inc ISL73847SEHEV2ZREVBPCB
2C87,C88
CAP-BOARDFLEX, SMD,
0603, 0.1µF, 25V, 10%,
X7R, ROHS
Kemet C0603X104K3RACTU
1C6
CAP, SMD, 0603, 0.056µF,
50V, 10%, X7R, ROHS Kemet C0603X563K5RAC7867
3 C8, C10, C11 CAP, SMD, 0805, 1.0µF,
25V, 10%, X7R, ROHS TDK C2012X7R1E105K
16
C26, C28, C30, C36, C74,
C75, C76, C77, C78, C79,
C80, C81, C82, C83, C84,
C85
CAP, SMD, 1206, 4.7µF,
25V, 10%, X7R, ROHS TDK C3216X7R1E475K
1C5
CAP, SMD, 1210, 22µF,
25V, 10%, X7R, ROHS Murata GRM32ER71E226KE15L
1C86
CAP, SMD, 0603, 100pF,
25V, 10%, X7R, ROHS Kemet C0603C101K3RAC7867
4 C18-C21 CAP, SMD, 0603, 1000pF,
16V, 10%, X7R, ROHS Venkel C0603X7R160102KNE
4 C22-C25 CAP, SMD, 0603, 0.01µF,
16V, 10%, X7R, ROHS Venkel C0603X7R160-103KNE
2C68,C69
CAP, SMD, 0603, 0.01µF,
25V, 10%, X7R, ROHS Venkel C0603X7R250-103KNE
4 C4, C14, C15, C34 CAP, SMD, 0603, 0.1µF,
25V, 10%, X7R, ROHS Yageo CC0603KRX7R8BB104
1C7
CAP, SMD, 0603, 0.1µF,
50V, 10%, X7R, ROHS AVX 06035C104KAT2A
1C2
CAP, SMD, 0603, 0.022µF,
16V, 10%, X7R, ROHS Venkel C0603X7R160-223K
1C3
CAP, SMD, 0603, 330pF,
50V, 5%, NP0, ROHS Panasonic ECJ-1VC1H331J
2C60,C61
CAP, SMD, 0603, 680pF,
50V, 10%, X7R, ROHS Murata GRM188R71H681KA01D
0C9
CAP, SMD, 0603, DNP-
PLACE HOLDER, ROHS
5 C12, C13, C16, C17, C32 CAP, SMD, 0805, 1.0µF,
25V, 10%, X5R, ROHS AVX 08053D105KAT4A
2C33,C35
CAP, SMD, 1206, 10µF,
25V, 10%, X7R, ROHS Venkel C1206X7R250-106KNE
12
C38, C40, C42, C44, C46,
C48, C50, C52, C54, C56,
C58, C62
CAP-TANT, SMD,
7.3x4.3mm, 100µF, 25V,
20%, 30mΩat 100MHz,
ROHS
Kemet T521X107M025ATE030

R34UZ0010EU0100 Rev.1.00 Page 11
Nov 21, 2022
ISL73847SEHEV2Z Evaluation Board Manual
24
C27, C29, C31, C37, C39,
C41, C43, C45, C47, C49,
C51, C53, C55, C57, C59,
C63, C64, C65, C66, C67,
C70, C71, C72, C73
CAP-TANT, SMD,
7.3×4.3×2.8, 220µF, 10V,
20%, 6mΩ, ROHS
Kemet T530D227M010ATE006
1C1
CAP, SMD, 0603, 8200pF,
50V, 5%, X7R, ROHS Vishay/Vitramon VJ0603Y822JXACW1BC
2L1,L2
COIL-PWR INDUCT, AEC-
Q200, SMD, 11.3×10mm,
0.22µH, 20%, 98.8A, ROHS
Coilcraft XAL1010-221MEB
2 BNC1, BNC2
CONN-RF, SMA JACK,
50Ω, 18GHz, TAB-END
LAUNCH, ROHS
Amphenol 132357-11
5 TP32-TP36
CONN-TURRET,
TERMINAL POST, TH,
ROHS
Keystone 1514-2
6TP1, TP8, TP10, TP13,
TP28, TP31
CONN-MINI TEST POINT,
VERTICAL, WHITE, ROHS Keystone 5002
1BA2
CONN-PLUG, BANA-
INSUL-SDRLESS, BLACK,
4mm, RA
Deltron 571-0100
1BA1
CONN-PLUG, BANA-
INSUL-SDRLESS, RED,
4mm, RA
Deltron 571-0500
3 JP1, JP4, JP5
CONN-HEADER, 1×3,
BREAKAWY 1×36,
2.54mm, ROHS
BERG/FCI 68000-236HLF
30
TP2, TP3, TP4, TP5, TP6,
TP7, TP9, TP11, TP12,
TP14-TP26, TP27, TP29,
TP30, TP37, TP38, JP2,
JP3, JP6
CONN-HEADER, 1×2,
RETENTIVE, 2.54mm,
0.230×0.120, ROHS
BERG/FCI 69190-202HLF
4JP6, JP1-Pins 2-3, JP4-
Pins 2-3, JP5-Pins 2-3
CONN-JUMPER, SHUNT,
2P, 2.54mmPITCH, BLK,
6mm, OPEN, ROHS
Sullins SPC02SYAN
1PG_LED
LED, SMD, 3×2.5mm, 4P,
RED/GREEN, 12/20MCD,
2V
Lumex SSL-LXA3025IGC-TR
10 Q1-Q8, U5, U6
IC-PROTO, RAD HARD,
40V GAN FET, 4P, CLCC,
ROHS
Renesas Electronics ISL70020SEHL/PROTO
1U4
IC-100V, RAD-HARD, GAN
FET DRIVER, SMD, 8P,
CLCC, ROHS
Renesas Electronics ISL70040SEHL/PROTO
2U2,U3
IC-RAD LIGHT GaN FET,
HALF BRIDGE DRIVER,
14P, CLCC, ROHS
Renesas Electronics ISL73041SEHL/PROTO
1U1
IC-RAD LIGHT BUCK
CONTROLLER, 24P, FP,
ROHS
Renesas Electronics ISL73847SEHF/PROTO
Qty Reference Designator Description Manufacturer Manufacturer Part

R34UZ0010EU0100 Rev.1.00 Page 12
Nov 21, 2022
ISL73847SEHEV2Z Evaluation Board Manual
1Q9
TRANSISTOR, N-
CHANNEL, 3LD, SOT-23,
60V, 115mA, ROHS
Diodes, Inc. 2N7002-7-F
16 R21-R24, R27-R30, R47-
R54
RES-AEC-Q200, SMD,
0402, 0Ω, 1/16W, TF,
ROHS
Vishay/Dale CRCW04020000Z0ED
2R9,R33
RES-AEC-Q200, SMD,
0603, 680Ω, 1/10W, 1%,
TF, ROHS
Vishay/Dale CRCW0603680RFKEA
12 R35-R46
RES-CURR.SENSE, SMD,
2512, 0.22Ω, 2W, 1%, TF,
ROHS
Bourns CRM2512-FX-R220ELF
0R31,R59
RESISTOR, SMD, 0603,
0.1%, MF, DNP-PLACE
HOLDER
2R19,R20
RES, SMD, 0402, 10K,
1/16W, 1%, TF, ROHS Panasonic ERJ-2RKF1002X
2R17,R18
RES, SMD, 0402, 3.65K,
1/16W, 1%, TF, ROHS Panasonic ERJ-2RKF3651
2R7,R8
RES, SMD, 0603, 0Ω,
1/10W, TF, ROHS Venkel CR0603-10W-000T
3 R10, R25, R26 RES, SMD, 0603, 10K,
1/10W, 1%, TF, ROHS Venkel CR0603-10W-1002FT
4 R4, R60, R61 RES, SMD, 0603, 100K,
1/10W, 1%, TF, ROHS Venkel CR0603-10W-1003FT
4 R13-R16 RES, SMD, 0603, 2.1K,
1/10W, 1%, TF, ROHS Panasonic ERJ-3EKF2101V
2R62,R63
RES, SMD, 0603, 30.1Ω,
1/10W, 1%, TF, ROHS Yageo RC0603FR-0730R1L
1R69
RES, SMD, 0603, 3.24K,
1/10W, 1%, TF, ROHS Panasonic ERJ-3EKF3241V
1R11
RES, SMD, 0603, 34.8K,
1/10W, 1%, TF, ROHS Venkel CR0603-10W-3482FT
1R3
RES, SMD, 0603, 4.22K,
1/10W, 1%, TF, ROHS Rohm MCR03EZPFX4221
4 R5, R6, R12, R70 RES, SMD, 0603, 4.99K,
1/10W, 1%, TF, ROHS Panasonic ERJ-3EKF4991V
1R1
RES, SMD, 0603, 604Ω,
1/10W, 1%, TF, ROHS Panasonic ERJ-3EKF6040V
2R55,R56
RES-AEC-Q200, SMD,
2512W, 0.002Ω, 3W, 2%,
MF, ROHS
Susumu Co., ltd KRL6432E-M-R002-G-T1
4 R32, R34, R57, R58
RES-AEC-Q200, SMD,
0603, 10Ω, 1/10W, 1%, TF,
ROHS
Rohm KTR03EZPF10R0
1R2
RES, SMD, 0603, 94.2K,
1/10W, 0.1%, THINFILM,
ROHS
Yageo RT0603BRD0794K2L
Qty Reference Designator Description Manufacturer Manufacturer Part

R34UZ0010EU0100 Rev.1.00 Page 13
Nov 21, 2022
ISL73847SEHEV2Z Evaluation Board Manual
2.3 Board Layout
4 Four corners
SCREW, 4-40×1/4in,
PHILLIPS, PANHEAD,
STAINLESS, ROHS
Building Fasteners PMSSS 440 0025 PH
4 Four corners
STANDOFF, 4-40×3/4in,
F/F, HEX, ALUMINUM, 0.25
OD, ROHS
Keystone 2204
4 TERM1-TERM4
HDWARE-WIRE LUG, TH,
11.8×10.3mm, SLOTTED
SCREW, 2-14AWG, ROHS
International Hydraulics Inc B2C-PCB
Figure 9. Silkscreen Top Layer
Figure 10. Top Layer
Qty Reference Designator Description Manufacturer Manufacturer Part

R34UZ0010EU0100 Rev.1.00 Page 14
Nov 21, 2022
ISL73847SEHEV2Z Evaluation Board Manual
Figure 11. Layer 2
Figure 12. Layer 3

R34UZ0010EU0100 Rev.1.00 Page 15
Nov 21, 2022
ISL73847SEHEV2Z Evaluation Board Manual
Figure 13. Layer 4
Figure 14. Layer 5

R34UZ0010EU0100 Rev.1.00 Page 16
Nov 21, 2022
ISL73847SEHEV2Z Evaluation Board Manual
Figure 15. Layer 6
Figure 16. Layer 7

R34UZ0010EU0100 Rev.1.00 Page 17
Nov 21, 2022
ISL73847SEHEV2Z Evaluation Board Manual
Figure 17. Bottom Layer
Figure 18. Silkscreen Bottom Layer

R34UZ0010EU0100 Rev.1.00 Page 18
Nov 21, 2022
ISL73847SEHEV2Z Evaluation Board Manual
3. Typical Performance Graphs
4. Ordering Information
5. Revision History
Unless otherwise noted, VOUT = 1V; LOUT = 220nH per phase, COUT = 2.64mF per phase, CDROOP = 56nF, CVREF = 100nF,
RDROOP =0Ω, RFS = 94.2kΩ, CSS = 22nF, CCOMP = 8.2nF, RCOMP = 4.22kΩ, CPOLE = 330pF, CVCC= 1µF, RSLP = 34.8kΩ,
CSLP = 100pF, TA= +25°C
Figure 19. Conversion Efficiency for Various VIN
(fSW = 500kHz, ISL70020SEHML, XAL1010-221ME)
Figure 20. Droop Regulation for Various Temperatures
(VIN = 12V, RDROOP = 604Ω)
Figure 21. Load Transient Response
(VIN = VDD = 12V, RDROOP = 604Ω)
Figure 22. SYNC-O Frequency = SYNC-I Frequency
(VDD = 12V, VIN = 12V, RSYNC-O = 100kΩto GND)
Part Number Description
ISL73847SEHEV2Z ISL73847SEH evaluation board
Revision Date Description
1.00 Nov 21, 2022 Initial release
0
10
20
30
40
50
60
70
80
90
100
0 1020304050
Efficiency (%)
ILOAD (A)
5V 9V
12V 15V
0.92
0.94
0.96
0.98
1.00
1.02
1.04
1.06
010203040
50
VOUT (V)
ILOAD (A)
+25°C
-55°C
+125°C
VOUT 20mV/Div
100µs/Div
ILOAD 50A/Div
ΔVOUT = 53mV
2µs/Div
SYNCI 5V/Div
PWM2 5V/Div
PWM1 5V/Div
SYNCO 5V/Div

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