Analog Devices DC3126A Quick setup guide

1
DEMO MANUAL DC3126A
Rev. 0
DESCRIPTION
LT8686S
42V Quad, Gangable, Synchronous, Monolithic
Step-Down Regulator
Demonstration circuit 3126A is a quad power supply fea-
turing the LT
®
8686S. The LT8686S is a 42V quad channel
current mode monolithic synchronous step-down regu-
lator. The LT8686S combines two 42V capable 2A buck
regulators with two 8V capable 2A buck regulators. The
demo board is designed for 5V, 3.3V, 1.8V, and 1.2V out-
puts from a nominal 12V input with switching frequency
set at 2MHz. The 5V and 3.3V converters are powered
from a wide range of 6V to 42V. The 1.8V and 1.2V con-
verters are powered from the 5V output by default or from
3V to 8V supply alternatively. The current capability is 2A
for all 4 outputs when running individually.
The DC3126A provides two 42V regulators that can be
combined to deliver up to 4A of output current using a
singular inductor. Similarly, the two 8V regulators can be
combined to deliver up to 4A of output current using a
singular inductor. The allowed channel combinations are
given in the data sheet.
The independent track/soft-start and power good for each
output simplify the complex design of quad-output power
converters. Each output can be independently disabled
into low quiescent current shutdown mode with its own
TRK/SS pin.
A user-selectable SYNC/MODE pin on the demo board
provides two primary modes of operation:pulse-skip-
ping mode and low ripple Burst Mode
®
operation, plus
the option of selecting frequency spread-spectrum for
each to improve the EMI/EMC performance. Burst Mode All registered trademarks and trademarks are the property of their respective owners.
delivers higher efficiency at light load than pulse-skipping
mode. In pulse-skipping mode, full switching frequency
is maintained to lower load currents than Burst Mode.
The SYNC/MODE pin can also be used to synchronize the
switching frequency to an external clock. The switching
frequency for all regulators can be programmed either via
an oscillator resistor or an external clock over a 350kHz
to 3MHz range. At all frequencies, a 180° phase shift is
maintained between channel 1 and channel 2, channel 3
and channel 4, reducing the input peak current and volt-
age ripple.
The demo board has an EMI filter installed on the bottom
layer. The conducted and radiated EMI performance of
the board is shown on Figure4. The red line in Figure4
is CISPR25 Class 5 peak limit. The figure shows that the
circuit passes the test with a wide margin. To achieve EMI/
EMC performance as shown in Figure4, the input EMI
filter is required, and the input voltage should be applied
at VEMI turret.
The LT8686S data sheet gives a complete description of
the part operation and application information. The data
sheet must be read in conjunction with this quick start
guide for DC3126A. The LT8686S is assembled in a 5mm
× 5mm LQFN package with exposed pads for low thermal
resistance. Proper board layout is essential for both low
EMI operation and best thermal performance.
Design files for this circuit board are available.

2
DEMO MANUAL DC3126A
Rev. 0
QUICK START PROCEDURE
Demonstration circuit 3126A is easy to set up to evalu-
ate the performance of the LT8686S. Refer to Figure1
for proper measurement equipment setup and use the
following the procedure.
1. With power off, place the jumpers in the following
positions:
JP1 JP2 JP3 JP4 JP5 JP6
EN/UVLO EN2 EN3 EN4 BIAS SYNC/MODE
ON ON ON ON VOUT1 BURST
2. With the power off, connect the input power supply
to VEMI+ and VEMI–.
3. With the power off, connect the loads from VOUT1,
VOUT2, VOUT3, and VOUT4 to GND.
4. Voltmeters can be placed across the output terminals
to get accurate output voltage measurements.
5. Turn on the power at the input.
NOTE: Make sure that the input voltage does not
exceed 42V.
6. Check for proper output voltages. The output should
be regulated at 5V(±4%), 3.3V(±4%), 1.8V(±4%),
and 1.2V (±4%).
NOTE: If there is no output, temporarily disconnect
the load to ensure that the load is not set too high.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN_HV HV Regulators Input Voltage (VIN1/VIN2) Range 6* 12 42 V
VIN_LV LV Regulators Input Voltage (VIN3/VIN4) Range 3 8** V
VOUT1 Output1 Voltage VIN_HV = 12V 4.8 5 5.2 V
VOUT2 Output2 Voltage VIN_HV = 12V 3.17 3.3 3.43 V
VOUT3 Output3 Voltage VIN_LV = 5V 1.73 1.8 1.87 V
VOUT4 Output4 Voltage VIN_LV = 5V 1.15 1.2 1.25 V
IOUT1 Maximum Output1 Current No Load on Downstream Channel 2 A
IOUT2 Maximum Output2 Current 2 A
IOUT3 Maximum Output3 Current 2 A
IOUT4 Maximum Output4 Current 2 A
fSW Switching Frequency 1.8 2 2.25 MHz
EFF Efficiency VIN_HV = 12V, fSW = 2MHz, VOUT1 = 5V, IOUT1 = 1A 93.3 %
VIN_HV = 12V, fSW = 2MHz, VOUT2 = 3.3V, IOUT2 = 1A 90.8 %
VIN_LV = 5V, fSW = 2MHz, VOUT3 = 1.8V, IOUT3 = 1A 92.1 %
VIN_LV = 5V, fSW = 2MHz, VOUT4 = 1.2V, IOUT4 = 1A 88.6 %
*The operating input voltage range for VIN1 and VIN2 is 3V to 42V. The 6V minimum input voltage spec is limited by the 5V output voltage.
**The operating input voltage range for VIN3 and VIN4 is 3V to 8V. The absolute maximum input voltage for VIN3 and VIN4 is 10V.
PERFORMANCE SUMMARY
Specifications are at TA= 25°C

3
DEMO MANUAL DC3126A
Rev. 0
QUICK START PROCEDURE
7. Once the proper output voltage is established, adjust
the load within the operating ranges and observe the
output voltage regulation, ripple voltage, efficiency,
and other parameters.
NOTE: When measuring the input or output voltage
ripple, take care to avoid a long ground lead on the
oscilloscope probe. Measure the output voltage ripple
by touching the probe tip directly across the output
capacitor. See Figure2 for the proper scope technique.
8. An external clock can be added to the SYNC terminal
when SYNC function is used (JP6 on the SYNC posi-
tion). Use resistor R25 to set the LT8686S switching
frequency close to the synchronization frequency.
9. (Option) Operation with Different Input Voltages
The low voltage channels, channel 3 and channel
4, can operate with different input voltages instead
of 5V VOUT1. The DC3126A provides and onboard
0Ω jumper (R29) to connect VIN_LV to VOUT1 by
default. The 0Ω jumper can be removed to disconnect
VIN_LVfrom VOUT1. Apply different input voltages for
channel 3 and channel 4 between VIN_LV and GND.
NOTE: Make sure that the VIN_LV input voltage does
not exceed 8V.
10. (Option)CombiningChannels(CH1+CH2,CH3+CH4)
Configuration
The DC3126A can combine two regulators to create
channels with higher current ratings using a single
inductor. Channel 1 and channel 2 can be combined to
deliver up to 4A of output current. Similarly, channel
3 and channel 4 can be combined to deliver up to 4A
of output current. Channel 1 and channel 3 are main
channels, channel 2 and channel 4 are subordinates.
The following simple modification is required:
1. Tie the SW1 and SW2 pins together with a low
impedance connection. Tie SW3 and SW4 together
with a low impedance connection. Since SW1 and
SW2, SW3 and SW4 are connected, there is only
one inductor needed for each output rail. Calculate
and insert the inductors needed for L1 and L3, and
remove L2 and L4.
2. Tie the BST1 and BST2 pins together with 0Ω
resistors (R9, R12). Tie the BST3 and BST4 pins
together with 0Ω resistors (R15, R18).
3. Tie the FB2 and FB4 pins to INTVCC with 0Ω
resistors (R31, R32). Keep the resistor divider
networks on the main channels and remove the
resistor divider networks on subordinate channels.
4. Float (do not use) PG2 and PG4. Only PG1 and PG3
are active.
5. Float (do not use) TRK/SS2 and TRK/SS4. Only
TRK/SS1 and TRK/SS3 are active.
6. Tie EN/UVLO and EN2 together with a 0Ω resistor
(R27), EN3 and EN4 together with a 0Ω resistor
(R30).

4
DEMO MANUAL DC3126A
Rev. 0
QUICK START PROCEDURE
Figure2. Scope Probe Placement for Measuring Input or Output Voltage Ripple
Figure1. Proper Measurement Equipment Setup
+ –
V
OUT
GND
COUT

5
DEMO MANUAL DC3126A
Rev. 0
TYPICAL PERFORMANCE CHARACTERISTICS
HV Channel Efficiency vs
Load Current
LV Channel Efficiency vs
Load Current
HV Channel Efficiency vs
Load Current
LV Channel Efficiency vs
Load Current
Figure3. HV and LV Channel Efficiency vs Load Current at VIN_HV = 12V at 24V, VIN_LV = 3.3V at 5V,
Burst Mode, and 2MHz Switching Frequency
V
IN_HV
= 12V, V
OUT1
= 5V
V
IN_HV
= 24V, V
OUT1
= 5V
LOAD CURRENT (A)
0
0.5
1
1.5
2
60
65
70
75
80
85
90
95
100
EFFICIENCY (%)
dc3126a F03a
V
IN_HV
= 12V, V
OUT2
= 3.3V
V
IN_HV
= 24V, V
OUT2
= 3.3V
LOAD CURRENT (A)
0
0.5
1
1.5
2
60
65
70
75
80
85
90
95
100
EFFICIENCY (%)
dc3126a F03b
V
IN_LV
= 3.3V, V
OUT3
= 1.8V
V
IN_LV
= 5V, V
OUT3
= 1.8V
LOAD CURRENT (A)
0
0.5
1
1.5
2
60
65
70
75
80
85
90
95
100
EFFICIENCY (%)
dc3126a F03c
V
IN_LV
= 3.3V, V
OUT4
= 1.2V
V
IN_LV
= 5V, V
OUT4
= 1.2V
LOAD CURRENT (A)
0
0.5
1
1.5
2
60
65
70
75
80
85
90
95
100
EFFICIENCY (%)
dc3126a F03d

6
DEMO MANUAL DC3126A
Rev. 0
Figure4. LT8686S Demo Circuit EMI Performance in CISPR25 Conducted and Radiated Emission Test
(VEMI = 14V, VOUT1 = 5V, VOUT2 = 3.3V, VOUT3 = 1.8V, VOUT4 = 1.2V, IOUT1 = 2A (Includes Current Supplying
VIN3 and VIN4), IOUT2 = IOUT3 = IOUT4 = 2A, 2MHz Switching Frequency)
Conducted EMI Performance
Radiated EMI Performance – Horizontal Polarization
(CISPR25 Radiated Emission Test with
Class 5 Peak Limits)
Radiated EMI Performance – Vertical Polarization
(CISPR25 Radiated Emission Test with
Class 5 Peak Limits)
TYPICAL PERFORMANCE CHARACTERISTICS
CLASS 5 PEAK LIMIT
SPREAD SPECTRUM MODE
FIXED FREQUENCY MODE
FREQUENCY (MHz)
0.1
1
10
100
–20
–10
0
10
20
30
40
50
60
AMPLITUDE (dBµV)
dc3126a F04a
CLASS 5 PEAK LIMIT
SPREAD SPECTRUM MODE
FIXED FREQUENCY MODE
FREQUENCY (MHz)
0
100
200
300
400
500
600
700
800
900
1000
–10
–5
0
5
10
15
20
25
30
35
40
45
50
AMPLITUDE (dBµV/m)
dc3126a F04b
CLASS 5 PEAK LIMIT
SPREAD SPECTRUM MODE
FIXED FREQUENCY MODE
FREQUENCY (MHz)
0
100
200
300
400
500
600
700
800
900
1000
–10
–5
0
5
10
15
20
25
30
35
40
45
50
AMPLITUDE (dBµV/m)
dc3126a F04c

7
DEMO MANUAL DC3126A
Rev. 0
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 2 C1, C13 CAP., 1µF, X5R, 50V, 10%, 0603 MURATA, GRT188R61H105KE13D
2 6 C2, C3, C6, C7, C9, C11 CAP., 0.1µF, X7R, 50V, 10%, 0402 MURATA, GCM155R71H104KE02D
3 2 C4, C5 CAP., 10µF, X7R, 50V, 10%, 1210 MURATA, GRM32ER71H106KA12L
4 1 C8 CAP., 10µF, X7R, 50V, 10%, 1206 SAMSUNG, CL31B106KBHNNNE
5 1 C10 CAP., 4.7µF, X5R, 10V, 10%, 0603 AVX, 0603ZD475KAT2A
6 1 C12 CAP., 22µF, ALUM ELECT, 63V, 20%, SMD, RADIAL,
CE-BS SERIES
SUN ELECTRONIC INDUSTRIES CORP, 63CE22BS
7 4 C14, C15, C16, C17 CAP., 0.01µF, X7R, 25V, 10%, 0603 MURATA, GRM188R71E103KA01D
8 2 C18, C36 CAP., 1µF, X7R, 6.3V, 10%, 0402 MURATA, GRM155R70J105KA12D
9 2 C19, C33 CAP., 100µF, X7S, 6.3V, 20%, 1210 MURATA, GRM32EC70J107ME15L
10 2 C21, C23 CAP., 0.1µF, X7R, 25V, 10%, 0402 MURATA, GCM155R71E104KE02D
11 1 C22 CAP., 4.7µF, X7R, 16V, 20%, 0805 TAIYO YUDEN, MCASE21GAB7475MTNA01
12 2 C24, C31 CAP., 4.7pF, X7R, 10V, 10%, 0603 AVX, 06033A4R7KAT2A
13 4 C25, C26, C34, C35 CAP., 0.1µF, X7R, 16V, 10%, 0402 MURATA, GCM155R71C104KA55D
14 2 C27, C30 CAP., 1µF, X5R, 10V, 10%, 0402 MURATA, GRM155R61A105KE15D
15 2 C28, C29 CAP., 47µF, X7R, 10V, 10%, 1210 MURATA, GRM32ER71A476KE15L
16 2 C32, C37 CAP., 47pF, C0G, 25V, 10%, 0603 AVX, 06035A4R7BAT2A
17 1 FB1 IND., 100Ω AT 100MHz, FERRITE BEAD, 25%, 4A,
20mΩ, 0805
TDK, MPZ2012S101ATD25
18 1 L1 IND., 2.2µH, PWR, SHIELDED, 20%, 8A, 23.5mΩ COILCRAFT, XFL4020-222MEB
19 1 L2 IND., 1.5µH, PWR, 20%, 9.1A, 15.8mΩ, SMD,
SHIELDED
COILCRAFT, XFL4020-152MEB
20 1 L3 IND., 1µH, PWR, SHIELDED, 20%, 11A, 11.9mΩ, SMD COILCRAFT, XFL4020-102MEB
21 1 L4 IND., 0.56µH, PWR, 20%, 6A, 5.53mΩ, SMD XFL4020-561MEB
22 1 L5 IND., 0.22µH, PWR, SHIELDED, 30%, 9.5A,
7.3mΩ, 4020
WURTH ELEKTRONIK, 744373240022
23 6 R1, R3, R5, R7, R10, R16 RES., 1M, 1%, 1/10W, 0603 VISHAY, CRCW06031M00FKEA
24 1 R11 RES., 191k, 1%, 1/10W, 0603 PANASONIC, RK73H1JTTD1913F
25 1 R13 RES., 124k, 1%, 1/10W, 0603 PANASONIC, ERJ3EKF1243V
26 6 R14, R19, R21, R22, R23,
R24
RES., 100k, 1%, 1/10W, 0603 PANASONIC, ERJ3EKF1003V
27 1 R17 RES., 316k, 1%, 1/10W, 0603 VISHAY, CRCW0603316KFKEA
28 1 R20 RES., 200k, 1%, 1/10W, 0603 VISHAY, CRCW0603200KFKEA
29 1 R25 RES., 22.6k, 1%, 1/10W, 0603 NIC, NRC06F2262TRF
30 1 R26 RES., 26.1k, 1%, 1/10W, 0603 PANASONIC, ERJ3EKF2612V
31 1 R29 RES., 0Ω, JUMPER, 45A, 0603, COPPER, SENSE VISHAY, WSL060300000ZEA9
32 1 U1 IC, 42V QUAD SYNC. MONOLITHIC STEP-DOWN
REGULATOR, LQFN-32
ANALOG DEVICES, LT8686SJV#PBF

8
DEMO MANUAL DC3126A
Rev. 0
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Additional Demo Board Circuit Components
1 0 C20 CAP., 22µF, 35V, 20%, SMD, RADIAL, CE-BSS SERIES SUN ELECTRONIC INDUSTRIES CORP, 35CE22BSS
2 0 R9, R12, R15, R18 RES., OPTION, 0402
3 0 R2, R4, R6, R8, R27, R30,
R31, R32
RES., OPTION, 0603
4 0 E17, E18 TEST POINT, TURRET, 0.094" MTG. HOLE,
PCB 0.062" THK
MILL-MAX, 2501-2-00-80-00-00-07-0
Hardware: For Demo Board Only
1 26 E1, E2, E3, E4, E5, E6, E7,
E8, E9, E10, E11, E12, E13,
E14, E15, E16, E19, E20,
E21, E22, E23, E24, E25,
E26, E27, E28
TEST POINT, TURRET, 0.094" MTG. HOLE,
PCB 0.062" THK
MILL-MAX, 2501-2-00-80-00-00-07-0
2 4 JP1, JP2, JP3, JP4 CONN., HDR, MALE, 1×3, 2mm, VERT, ST, THT WURTH ELEKTRONIK, 62000311121
3 1 JP5 CONN., HDR, MALE, 2×3, 2mm, VERT, ST, THT WURTH ELEKTRONIK, 62000621121
4 1 JP6 CONN., HDR, MALE, 2×4, 2mm, VERT, ST, THT WURTH ELEKTRONIK, 62000821121
5 4 MP1, MP2, MP3, MP4 STANDOFF, NYLON, SNAP-ON, 0.50" KEYSTONE, 8833
6 6 XJP1, XJP2, XJP3, XJP4,
XJP5, XJP6
CONN., SHUNT, FEMALE, 2-POS, 2mm WURTH ELEKTRONIK, 60800213421

9
DEMO MANUAL DC3126A
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog
Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications
subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
SCHEMATIC DIAGRAM
5
5
4
4
3
3
2
2
1
1
D
D
C
C
B
B
A
A
PULSE-SKIPPING OR SYNC
BURST
PULSE-SKIPPING W/ SSM
LT8686SEV U1
BURST W/SSM
(2MHz)
OFF
3.3V / 2A
ON ON
5V /
OFF
ON
1.8V / 2A
OFF
1.2V / 2A
ON
OFF
1. All Resistors 0603. NOTE: UNLESS OTHERWISE SPECIFIED. 2. All Capacitors 0603. * SEE DEMO MANUAL FOR DETAILS ON VOUT CURRENT CAPABILITY.
2A *
DATE:
SHEET OF
TITLE: SCHEMATIC
APPROVALS
PCB DES. APP ENG.
SIZE:
SCHEMATIC NO. AND REVISION:
CUSTOMER NOTICE
THIS CIRCUIT IS PROPRIETARY TO ANALOG DEVICES AND SUPPLIED FOR USE WITH ANALOG DEVICES PARTS.
SKU NO. IC NO.
ANALOG DEVICES HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT ANALOG DEVICES APPLICATIONS ENGINEERING FOR ASSISTANCE.
2555 AUGUSTINE DRIVE
www.analog.com
ANALOG
DEVICES
AHEAD OF WHAT'S POSSIBLE TM
SANTA CLARA, CA 95054
11
NAME NAME
LT8686SEV
42V QUAD, GANGABLE, SYNCHRONOUS
DC3126A 710-DC3126A_REV04
N/A
Thursday, June 23, 2022
MONOLITHIC STEP-DOWN REGULATOR
<Core Design>
DATE:
SHEET OF
TITLE: SCHEMATIC
APPROVALS
PCB DES. APP ENG.
SIZE:
SCHEMATIC NO. AND REVISION:
CUSTOMER NOTICE
THIS CIRCUIT IS PROPRIETARY TO ANALOG DEVICES AND SUPPLIED FOR USE WITH ANALOG DEVICES PARTS.
SKU NO. IC NO.
ANALOG DEVICES HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT ANALOG DEVICES APPLICATIONS ENGINEERING FOR ASSISTANCE.
2555 AUGUSTINE DRIVE
www.analog.com
ANALOG
DEVICES
AHEAD OF WHAT'S POSSIBLE TM
SANTA CLARA, CA 95054
11
NAME NAME
LT8686SEV
42V QUAD, GANGABLE, SYNCHRONOUS
DC3126A 710-DC3126A_REV04
N/A
Thursday, June 23, 2022
MONOLITHIC STEP-DOWN REGULATOR
<Core Design>
DATE:
SHEET OF
TITLE: SCHEMATIC
APPROVALS
PCB DES. APP ENG.
SIZE:
SCHEMATIC NO. AND REVISION:
CUSTOMER NOTICE
THIS CIRCUIT IS PROPRIETARY TO ANALOG DEVICES AND SUPPLIED FOR USE WITH ANALOG DEVICES PARTS.
SKU NO. IC NO.
ANALOG DEVICES HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT ANALOG DEVICES APPLICATIONS ENGINEERING FOR ASSISTANCE.
2555 AUGUSTINE DRIVE
www.analog.com
ANALOG
DEVICES
AHEAD OF WHAT'S POSSIBLE TM
SANTA CLARA, CA 95054
11
NAME NAME
LT8686SEV
42V QUAD, GANGABLE, SYNCHRONOUS
DC3126A 710-DC3126A_REV04
N/A
Thursday, June 23, 2022
MONOLITHIC STEP-DOWN REGULATOR
<Core Design>
JP6
1 3 5 6
4 2
7 8
R1 1M
C33 100uF 6.3V 1210
E19 EN3
E16 SYNC
R26 26.1k
R27 OPT
C25
0.1uF
0402
16V
C34 0.1uF 0402 16V
C35
0.1uF
0402
16V
C19 100uF 6.3V 1210
R21 100k
R25 22.6k
C21
0.1uF
25V
0402
R9 OPT 0402
C13 1uF
E3
EN/UVLO
E22
GND
E27 PG3
+
C12 22uF 63CE22BS 63V
12
R23100k
C3 0.1uF 0402 50V
R16 1M
JP1
EN/UVLO
1 3 2
C26 0.1uF 0402 16V
E15
VEMI+
6V - 42V
R13 124k
E11
PG1
L5
0.22uH
744373240022
1 2
C1 1uF 50V
R30 OPT
C32 47pF
E8
GND
GND GND
GND GND
33 34 35 36
VIN2
10
EN/UVLO
5
EN2
7
VIN3 15
EN3 18
BIAS
29
VIN1
9
EN4 20
VIN4 16
BST1
2
SW1
1
FB1
6
BST3 26
SW3 25
FB3 17
BST4 23
SW4 24
FB4 19
TRK/SS1
4
TRK/SS2
11
TRK/SS3 14 TRK/SS4 21
PG1
3
PG2
30
PG3 27 PG4 22
INTVCC
28
RT
13
SYNC/MODE
12
BST2
31
FB2
8
SW2
32
FB1
MPZ2012S101ATD25
1 2
C31 4.7pF
C2 0.1uF 0402 50V
E7
VOUT2
JP5
BIAS
BIAS VOUT1 GND
1 3 5 6
4 2
C22 4.7uF 16V 0805
R10 1M
E23
VOUT4
JP4 EN4
1 3 2
L3 1uH
XFL4020-102MEC
1 2
R17 316k
E6
GND
R20
200k
R7 1M
C15
0.01uF
R3 1M
C17 0.01uF
C27 1uF 10V 0402
L4 0.56uH
XFL4020-561MEB
1 2
C36 1uF 6.3V 0402
C18 1uF 6.3V 0402
L1
2.2uH
XFL4020-222MEB
12
E14
VEMI-
R8 OPT
C30 1uF 10V 0402
+
C20 22uF
35CE22BSS
OPT
12
R4
OPT
C14
0.01uF
R6 OPT
E2
GND
C4 10uF 50V 1210
E25
TRK/SS3
C16 0.01uF
R2
OPT
E5
VOUT1
C11 0.1uF 50V 0402
R22 100k
L2
1.5uH
XFL4020-152MEB
12
E9
TRK/SS1
JP2
EN2
1 3 2
R32 OPT
R18 OPT 0402
R14 100k
E24
GND
E21
VOUT3
C29 47uF 1210 10V
R31 OPT
C5 10uF 50V 1210
C28 47uF 1210 10V
C37
47pF
C8 10uF 50V 1206
R15 OPT 0402
R19
100k
E28 PG4 E26
TRK/SS4
R24100k
R12 OPT 0402
R11
191k
E12
PG2
E18 GND
OPT
E10
TRK/SS2
E1
VIN_HV
6V - 42V
C23
0.1uF
25V
0402
C24 4.7pF
C7
E17 VIN_LV
3V-8V OPT
C6 0.1uF 0402 50V
E13
BIAS
C9 0.1uF 50V 0402
JP3 EN3
1 3 2
E20 EN4
C10 4.7uF 10V
R5 1M
E4
EN2
R29
0
VIN_HV
VIN_HV VIN_LV
EN3
VIN_HV
VIN_LV
EN4
VOUT1 VOUT3
VOUT2 VOUT4
INTVCC
INTVCC INTVCC
INTVCC
INTVCC
INTVCC
VIN_LV
VOUT1
VIN_HV
INTVCC
INTVCC
VOUT1
BST2BST1
BST3 BST4
BST1 BST2
BST3
BST4

10
DEMO MANUAL DC3126A
Rev. 0
 ANALOG DEVICES, INC. 2023
2/23
www.analog.com
ESD Caution
ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection
circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality.
Legal Terms and Conditions
By using the evaluation board discussed herein (together with any tools, components documentation or support materials, the “Evaluation Board”), you are agreeing to be bound by the terms and
conditions set forth below (“Agreement”) unless you have purchased the Evaluation Board, in which case the Analog Devices Standard Terms and Conditions of Sale shall govern. Do not use the Evaluation
Board until you have read and agreed to the Agreement. Your use of the Evaluation Board shall signify your acceptance of the Agreement. This Agreement is made by and between you (“Customer”)
and Analog Devices, Inc. (“ADI”), with its principal place of business at One Technology Way, Norwood, MA 02062, USA. Subject to the terms and conditions of the Agreement, ADI hereby grants to
Customer a free, limited, personal, temporary, non-exclusive, non-sublicensable, non-transferable license to use the Evaluation Board FOR EVALUATION PURPOSES ONLY. Customer understands and
agrees that the Evaluation Board is provided for the sole and exclusive purpose referenced above, and agrees not to use the Evaluation Board for any other purpose. Furthermore, the license granted
is expressly made subject to the following additional limitations:Customer shall not (i) rent, lease, display, sell, transfer, assign, sublicense, or distribute the Evaluation Board;and (ii) permit any Third
Party to access the Evaluation Board. As used herein, the term “Third Party”includes any entity other than ADI, Customer, their employees, affiliates and in-house consultants. The Evaluation Board is
NOT sold to Customer;all rights not expressly granted herein, including ownership of the Evaluation Board, are reserved by ADI. CONFIDENTIALITY. This Agreement and the Evaluation Board shall all
be considered the confidential and proprietary information of ADI. Customer may not disclose or transfer any portion of the Evaluation Board to any other party for any reason. Upon discontinuation of
use of the Evaluation Board or termination of this Agreement, Customer agrees to promptly return the Evaluation Board to ADI. ADDITIONAL RESTRICTIONS. Customer may not disassemble, decompile
or reverse engineer chips on the Evaluation Board. Customer shall inform ADI of any occurred damages or any modifications or alterations it makes to the Evaluation Board, including but not limited
to soldering or any other activity that affects the material content of the Evaluation Board. Modifications to the Evaluation Board must comply with applicable law, including but not limited to the RoHS
Directive. TERMINATION. ADI may terminate this Agreement at any time upon giving written notice to Customer. Customer agrees to return to ADI the Evaluation Board at that time. LIMITATION OF
LIABILITY. THE EVALUATION BOARD PROVIDED HEREUNDER IS PROVIDED “AS IS”AND ADI MAKES NO WARRANTIES OR REPRESENTATIONS OF ANY KIND WITH RESPECT TO IT. ADI SPECIFICALLY
DISCLAIMS ANY REPRESENTATIONS, ENDORSEMENTS, GUARANTEES, OR WARRANTIES, EXPRESS OR IMPLIED, RELATED TO THE EVALUATION BOARD INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTY OF MERCHANTABILITY, TITLE, FITNESS FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS. IN NO EVENT WILL ADI AND ITS
LICENSORS BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES RESULTING FROM CUSTOMER’S POSSESSION OR USE OF THE EVALUATION BOARD, INCLUDING
BUT NOT LIMITED TO LOST PROFITS, DELAY COSTS, LABOR COSTS OR LOSS OF GOODWILL. ADI’S TOTAL LIABILITY FROM ANY AND ALL CAUSES SHALL BE LIMITED TO THE AMOUNT OF ONE
HUNDRED US DOLLARS ($100.00). EXPORT. Customer agrees that it will not directly or indirectly export the Evaluation Board to another country, and that it will comply with all applicable United States
federal laws and regulations relating to exports. GOVERNING LAW. This Agreement shall be governed by and construed in accordance with the substantive laws of the Commonwealth of Massachusetts
(excluding conflict of law rules). Any legal action regarding this Agreement will be heard in the state or federal courts having jurisdiction in Suffolk County, Massachusetts, and Customer hereby submits
to the personal jurisdiction and venue of such courts. The United Nations Convention on Contracts for the International Sale of Goods shall not apply to this Agreement and is expressly disclaimed.