1
Rev 0
DEMO MANUAL DC1822B
DESCRIPTION
LTC3861EUHE
High Current, Dual Output
Synchronous Buck Converter
Demonstration circuit 1822B is a dual output synchro-
nous buck converter featuring the LT C
®
3861EUHE. The
board provides two outputs of 1.5V/25A and 1.2V/25A
from an input voltage of 7V to 14V at a switching fre-
quency of 500kHz. The power stage consists of a 6mm
× 6mm DrMOS and a 13mm × 13mm iron powder type
inductor. An on-board 5V LT
®
3470 buck regulator pro-
vides the 5V bias for the LTC3861 and the DrMOS.
The demo board uses a high density, two sided drop-in
layout. The power components, excluding the bulk output
and input capacitors, fit within a 1.5" × 1.2" area on the
top layer. The control circuit fits in a 1.1" × 1.0" area on
the bottom layer. The package style for the LTC3861EUHE
is a 36-lead 5mm × 6mm QFN.
PERFORMANCE SUMMARY
The main features of the board are:
• Remote sensing for each output, where the divider
is placed before a high input impedance differential
amplifier.
• CLKIN and CLKOUT pins.
• Optional resistors to tie the two outputs together.
• Connector and header to tie two or more boards
together for up to 12-phase operation.
• Optional footprint for an LTC4449 gate driver and
discrete MOSFETs.
• Optional footprint for a dual phase Delta power block.
Design files for this circuit board are available.
(TA = 25°C), no airflow
PARAMETER CONDITION VALUE
Minimum Input Voltage 7V
Maximum Input Voltage 14V
Output Voltage VOUT1 IOUT1 = 0A to 25A, VIN = 7V to 14V 1.5V ±2%
Output Voltage VOUT2 IOUT2 = 0A to 25A, VIN = 7V to 14V 1.2V ±2%
VOUT1 Maximum Output Current, IOUT1 VIN = 7V to 14V, VOUT1 = 1.5V 25A
VOUT2 Maximum Output Current, IOUT2 VIN = 7V to 14V, VOUT2 = 1.2V 25A
Nominal Switching Frequency 500kHz
Efficiency
(See Figure2 and Figure3)
VOUT1 = 1.5V, IOUT1 = 25A, VIN = 12V 91.6% Typical
VOUT2 = 1.2V, IOUT2 = 25A, VIN = 12V 90.7% Typical
Note: The DC1828B demo circuit and manual replaces the DC1828A. The demo board was modified slightly.
All registered trademarks and trademarks are the property of their respective owners.
2
Rev 0
DEMO MANUAL DC1822B
QUICK START PROCEDURE
Figure1. Proper Measurement Equipment Setup
Demonstration circuit 1822B is easy to set up to evaluate
the performance of the LTC3861EUHE. Please refer to
Figure1 for proper measurement equipment setup and
follow the procedure below.
1. With power off, connect the input supply, load and
meters, as shown in Figure1. Preset the load to 0A
and V
IN
supply to be 0V. Place jumpers in the following
positions:
JP1 RUN1 ON
JP2 RUN2 ON
JP3 INT BIAS ON
2. Adjust the input voltage to be between 7V to 14V. VOUT1
should be 1.5V ±2%.VOUT2 should be 1.2V ± 2%.
3. Next, apply 25A load to each output and re-measure
VOUT.
4. Once the DC regulation is confirmed, observe the out-
put voltage ripple, load step response, efficiency and
other parameters.
NOTE 1. Use the BNC connectors labeled VOUT1 or
VOUT2 to measure the output voltage ripple.
NOTE 2. Do not apply the load from the VOS1+ turret to
the VOS1– turret or from the VOS2+ turret to the VOS2–
turret. These are connected to the sense traces for the
output voltage. Heavy load currents applied across these
turrets may damage these traces.
VIN SUPPLY
VOUT1
*
IIN A
A A
VV
V
+ –
+
–
VOUT2
*
VOUT2
LOAD
VOUT1
LOAD
IOUT2
IOUT1
+
–
VIN
+
–
dc1822b F01
Monitor voltage across COUT5
and COUT10 for accurate
efficiency measurements.
+ –+–
3
Rev 0
DEMO MANUAL DC1822B
QUICK START PROCEDURE
Figure2. Efficiency Curves for the 1.5V Rail of the DC1822B.
fSW = 500kHz with the FDMF6820A DrMOS
Figure3. Efficiency Curves for the 1.2V Rail of the DC1822B.
fSW = 500kHz with the FDMF6820A DrMOS
DYNAMIC LOAD CIRCUIT (OPTIONAL)
1. Preset the amplitude of a pulse generator to 0.0V and
the duty cycle to 5% or less.
2. Connect the scope to the VOUT BNC connectors for
the rail under test with a coax cable. To monitor the
load step current, connect the scope probe across the
ISTEP± turrets for that rail.
3. Connect the output of the pulse generator to the PULSE
GEN turret for the rail under test and connect the return
to one of the GND turrets.
4. With the converter running, slowly increase the ampli-
tude of the pulse generator output to provide the
desired load step pulse height. The scaling for the load
step signal is 10mV/Amp. See Figure4 and Figure5 for
transient response curves with a 50% load change.
70
75
80
85
90
95
0 5 10 15 20 25 30
Efficiency (%)
Load Current (Amps)
VIN = 7V
VIN = 12V
VIN = 14V
Parameters and conditions:
RBOOST = 2.2Ω
L = Würth 744355147
(0.47µH, DCR = 0.67mΩ ±10%)
External 5V bias applied
Power from the external 5V bias included in the
efficiency measurements
1.2V rail disabled
No airflow
dc1822b F02
(R2, R25)
dc1822b F03
70
75
80
85
90
95
0 5 10 15 20 25 30
Efficiency (%)
Load Current (Amps)
VIN = 7V
VIN = 12V
VIN = 14V
Parameters and conditions:
RBOOST = 2.2Ω
L = Würth 744355147
(0.47µH, DCR = 0.67mΩ ±10%)
External 5V bias applied
Power from the external 5V bias included in the
efficiency measurements
1.5V rail disabled
No airflow
(R2, R25)
4
Rev 0
DEMO MANUAL DC1822B
SINGLE OUTPUT/DUAL PHASE OPERATION
A single output/dual phase converter may be preferred
for higher output current applications. The optional com-
ponents required to tie the phases together are found on
the bottom of the schematic shown in Figure8. To tie the
two outputs together, make the following modifications:
1. Stuff 0Ω at R36 and R47 to tie the two outputs together.
2. Select one rail to be the master.
• If VOUT1 is the master, then stuff 0Ω at R51 to disable
the error amplifier for phase 2. Also stuff 0Ω at R52.
• If VOUT2 is the master, then stuff 0Ω at R49 to disable
the error amplifier for phase 1. Also stuff 0Ω at R50.
3. Remove the 0Ω jumper at R13 and stuff a 100pF
capacitor at C14 for the IAVG signal.
4. Stuff 0Ω at R53, R48 and R54 to tie the COMP, TRK/SS
and RUN pins together.
5. Remove the redundant compensation components.
PARALLELING BOARDS
The DC1822B demo boards can be tied together to form a
converter with up to 12 phases. To tie the boards together,
place the boards side-by-side and then connect the boards
by connecting J8 of one board to J9 of the other. This
will connect the IAVG, COMP, TRK/SS and signal ground
signals together. Next, use copper strips to tie the VOUT
planes, the VIN planes and GND planes of the two adjacent
boards together. The board has exposed copper along the
edges of the board for this purpose. Figure6 shows how
to set up a 4-phase converter and Figure7 shows how to
set up a 3-phase plus single phase converter.
Figure4. Load Step Response of the DC1822B 1.5V Rail at VIN = 12V.
COUT = 3× Sanyo 2R5TPE330M9 || 2× 100µF X5R 6.3V 1210, L = 0.47µH,
fSW = 500kHz
Figure5. Load Step Response of the DC1822B 1.2V Rail at VIN = 12V.
COUT = 3× Sanyo 2R5TPE330M9 || 2× 100µF X5R 6.3V 1210, L = 0.47µH,
fSW = 500kHz
QUICK START PROCEDURE
1.5VO(AC)
50mV/DIV
LOAD STEP
5A/DIV
dc1822b F04
20µs/DIV
12.5A
25A
88mV
1.2VO(AC)
50mV/DIV
LOAD STEP
5A/DIV
dc1822b F05
20µs/DIV
12.5A
25A
91mV
5
Rev 0
DEMO MANUAL DC1822B
QUICK START PROCEDURE
Cu Cu
BOARD 1—TOP LAYER BOARD 2—TOP LAYER
Note: Tie GND shapes together on the bottom layer by using the exposed copper along the edge of the board.
VOUT
VOUT
VIN
VIN
VOUT
VOUT
VIN
R50 R17 R52 R24 R49 R51 R48 R53 R54 R41 R42 C14 R13
FB1 TO
VCC IAVG PINILIM2 R
ILIM2 TO
VCCILIM1 R
R36 & R47
VOUT1 TO
VOUT2
TRK/SS1
TO
TRK/SS2
COMP1
TO
COMP2
RUN1 TO
RUN2
ILIM1 TO
VCC
FB2 TO
VCC
PHASE MODE
SETTING
BOARD #1 0.0mΩ NS STUFF 0Ω NS NS 0Ω 0Ω 0Ω 0Ω NS NS 100pF NS
BOARD #2 0.0mΩ NS STUFF 0Ω NS 0Ω 0Ω 0Ω 0Ω 0Ω NS NS 100pF NS
dc1822a F06
Figure6. Setup of a 4-Phase Converter; Phase 1 of Board 1 is the Master
6
Rev 0
DEMO MANUAL DC1822B
QUICK START PROCEDURE
Note: Tie GND shapes together on the bottom layer by using the exposed copper along the edge of the board.
R50 R17 R52 R24 R49 R51 R48 R53 R54 R41 R42 C14 R13
FB1 TO
VCC IAVG PINILIM2 R
ILIM2 TO
VCCILIM1 R
R36 & R47
VOUT1 TO
VOUT2
TRK/SS1
TO
TRK/SS2
COMP1
TO
COMP2
RUN1 TO
RUN2
ILIM1 TO
VCC
FB2 TO
VCC
PHASE MODE
SETTING
BOARD #1 0.0mΩ NS STUFF 0Ω NS NS 0Ω 0Ω 0Ω 0Ω NS NS 100pF NS
BOARD #2 NS NS STUFF NS STUFF 0Ω NS NS NS NS 0Ω NS 100pF NS
Cu Cu
Triple
phase
rail
Single
phase
rail
VOUT1
VOUT1
VIN
VIN
VOUT1
VOUT2
VIN
dc1822a F07
BOARD 1—TOP LAYER BOARD 2—TOP LAYER
Figure7. Setup of a 3-Phase Plus Single Phase Converter; Phase 1 of Board 1 Is the Master of the 3-Phase Rail
7
Rev 0
DEMO MANUAL DC1822B
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
DC1822B Required Circuit Components
1 4 C1, C7, C8, C9 CAP, 0.22µF, 10%, 25V, X7R, 0603 AVX 06033C224KAT2A
2 2 C1-1, C1-2 CAP, 1500pF, 10%, 50V, GOG, 0603 MURATA,GRM1885C1H152JA01D
3 2 C2-1, C2-2 CAP, 100pF, 5%, 25V, NPO, 0603 AVX 06033A101JAT2A
4 2 C28, C29 CAP, 10µF, 20%, 6.3V, X5R, 0805 AVX 08056D106MAT2A
5 4 C3, C11, C34, C35 CAP, 2.2µF, 10%, 16V, X7R, 0603 MURATA GRM188R61C225KE15D
6 2 C3-1, C3-2 CAP, 3300pF, 10%, 50V X7R, 0603 AVX 06035C332KAT2A
7 1 C6 CAP, 1µF, 20%, 25V, X5R, 0603 AVX 06033D105MAT2A
8 1 CIN2 CAP, 180µF, 20%, 16V, OSCON SANYO 16SVP180MX
9 4 CIN3, CIN4, CIN5, CIN6 CAP, 22µF, 20%, 16V, X5R, 1210 AVX 1210YD226MAT2A
10 6 COUT1-COUT3, COUT6-COUT8 CAP, 330µF, 20%, 2.5V POSCAP 7343 SANYO 2R5TPE330M9
11 4 COUT4, COUT5, COUT9, COUT10 CAP, 100µF, 20%, 6.3V, X5R, 1210 AVX 12106D107MAT2A
12 2 L1,L2 IND, 0.47µH, 20% WURTH 744355147
13 2 R1, R45 RES, 18.2k, 1%, 1/10W, 0603 VISHAY CRCW060318K2FKEA
14 4 R11, R18, R39, R43 RES, 10Ω, 1%, 1/10W, 0603 VISHAY CRCW060310R0FKEA
15 2 R17, R24 RES, 53.6k, 1%, 1/10W, 0603 VISHAY CRCW060353K6FKEA
16 2 R2, R25 RES, 2.2Ω, 1%, 1/16W, 0603 VISHAY CRCW06032R20FKEA
17 2 R20, R38 RES, 2.87k, 1%, 1/10W, 0603 VISHAY CRCW06032K87FKEA
18 1 R2-1 RES, 9.76k, 1%, 1/16W, 0603 VISHAY CRCW06039K76FKEA
19 1 R2-2 RES, 9.31k, 1%, 1/16W, 0603 VISHAY CRCW06039K31FKEA
20 3 R3, R16, R26 RES, 1Ω, 1%, 1/10W, 0603 YAGEO RC0603FR-071RL
21 2 R3-1, R3-2 RES, 280Ω, 1%, 1/10W, 0603 VISHAY CRCW0603280RFKEA
22 1 R37 RES, 34k, 1%, 1/10W, 0603 VISHAY CRCW060334K0FKEA
23 2 R8, R44 RES, 100k, 1%, 1/10W, 0603 VISHAY CRCW0603100KFKEA
24 9 R9, R12, R13, R19, R21-R23,
R32, R73
RES, 0Ω, JUMPER, 0603 VISHAY CRCW06030000Z0EA
25 11 RB-1, RB-2, RT-2, R1-1, R1-2, R4-R6,
R29, R30, R46
RES, 10k, 1%, 1/10W, 0603 VISHAY CRCW060310K0FKEA
26 1 RT-1 RES, 15k, 1%, 1/10W, 0603 YAGEO RC0603FR-0715KL
27 1 U1 I.C., LTC3861EUHE ANALOG DEVICES LTC3861EUHE#PBF
28 2 U2, U3 MOSFET, DrMOS, DC-DC, 3.3V, PWM FAIRCHILD FDMF6820A
Additional Circuit Components
1 1 C17 CAP, 0.22µF, 10%, 25V, X7R, 0603 AVX 06033C224KAT2A
2 1 C18 CAP, 1µF, 20%, 25V, X5R, 0603 AVX 06033D105MAT2A
3 1 C19 CAP, 22µF, 20%, 16V, X5R, 1210 AVX 1210YD226MAT2A
4 2 C2, C4, C5, C10, C12-C16, C20, C22-
C25, C27, C30-C33
CAP, 0603 OPT
5 1 C21 CAP, 22pF, 10%, 25V, NPO, 0603 AVX 06033A220KAT2A
6 1 C26 CAP, 1µF, 20%, 25V, X5R, 0603 AVX 06033D105MAT2A
7 0 CIN1 CAP, SVP, F8 OPT
8 0 CIN7-CIN14, COUT11-COUT17 CAP, 1210 OPT
9 0 COUT15-COUT17, COUT22-COUT24 CAP, 7343 OPT
10 0 D1 DIODE, BAV170, SOT23 OPT
8
Rev 0
DEMO MANUAL DC1822B
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
11 0 D2, D3 CMDSH-3 OPT
12 1 L3 IND, 33µH, –53DLC TOKO A914BYW-330M=P3
13 0 L4 INDUCTOR, –53LDC OPT
14 0 PB1 DC/DC Converters, D12S1R845A OPT
15 2 Q1, Q2 MOSFET, 30V N-CHANNEL, DPAK VISHAY SUD50N03-12P-E3
16 0 Q3, Q4, Q7, Q8 BSC050NE2LS OPT
17 0 Q5, Q6, Q9, Q10 BSC010NE2LS OPT
18 0 R10, R14, R15, R27, R28, R31, R33-
R35, R41, R42, R47-R55, R62, R64-
R67, R69, R71, R72, R74-R81
RES, 0603 OPT
19 2 R56, R58 RES, 10k, 1%, 1/10W, 0603 VISHAY CRCW060310K0FKEA
20 2 R57, R60 RES, 0.010Ω, 1%, 1W, 2010 IRC LRC-LRF2010LF-01-R010-F
21 1 R59 RES, 0Ω, JUMPER, 1206 VISHAY CRCW12060000Z0EA
22 1 R61 RES, 604k, 1%, 1/16W, 0603 VISHAY CRCW0603604KFKEA
23 1 R63 RES, 200k, 1%, 1/16W, 0603 VISHAY CRCW0603200KFKEA
24 1 U4 BUCK REGULATOR, LT3470ETS8 ANALOG DEVICES LT3470ETS8
25 0 U5 BUCK REGULATOR, LT3470ETS8 OPT
26 0 U8, U9 N-CHANNEL MOSFET DRIVER, LTC4449 OPT
Hardware
1 27 E1-E27 TESTPOINT, TURRET, 0.095" MILL-MAX 2501-2-00-80-00-00-07-0
2 6 J1-J6 STUD, TEST PIN PEM KFH-032-10
3 12 J1-J6 NUT, BRASS PL #10-32 ANY #10-32M/S
4 6 J1-J6 RING, LUG #10 KEYSTONE 8205
5 6 J1-J6 WASHER, TIN, PLATED BRASS ANY
6 2 J7, J10 CON, BNC, 5 PINS CONNEX 112404
7 1 J8 HEADER, DOBL ROW, RT ANGLE, 2×4, 8 PIN MILL-MAX 802-10-008-20-001000
8 1 J9 SOCKET, DBL ROW, RT ANGLE, 2×4, 8 PIN MILL-MAX 803-43-008-20-001000
9 4 JP1, JP2, JP3, JP4 HEADER, 3 PIN, 0.079" SINGLE ROW SAMTEC TMM-103-02-L-S
10 4 MTGS AT 4 CORNERS STAND-OFF, NYLON 0.5" KEYSTONE 8833 (SNAP-ON)
11 4 XJP1, XJP2, XJP3, XJP4 SHUNT, 0.079" CENTER SAMTEC 2SN-BK-G
9
Rev 0
DEMO MANUAL DC1822B
SCHEMATIC DIAGRAM
Figure8. DC1822B Demo Circuit Schematic
A
A
B
B
C
C
D
D
E
E
4 4
3 3
2 2
1 1
SYNCHRONOUS BUCK CONVERTER
HIGH CURRENT DUAL OUTPUT
710-DC1822B_REV01
HIGH CURRENT DUAL OUTPUT
710-DC1822B_REV01
HIGH CURRENT DUAL OUTPUT
710-DC1822B_REV01
U2
+
+
+
+
+
+
+
+
10
Rev 0
DEMO MANUAL DC1822B
SCHEMATIC DIAGRAM
Figure9. DC1822B Demo Circuit Schematic
A
A
B
B
C
C
D
D
E
E
4 4
3 3
2 2
1 1
SYNCHRONOUS BUCK CONVERTER
HIGH CURRENT DUAL OUTPUT
710-DC1822B_REV01
HIGH CURRENT DUAL OUTPUT
710-DC1822B_REV01
HIGH CURRENT DUAL OUTPUT
710-DC1822B_REV01
+
+
+
+
+
+
11
Rev 0
DEMO MANUAL DC1822B
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
Figure10. DC1822B Demo Circuit Schematic
A
A
B
B
C
C
D
D
E
E
4
4
3
3
2
2
1
1
SYNCHRONOUS BUCK CONVERTER
HIGH CURRENT DUAL OUTPUT
710-DC1822B_REV01
HIGH CURRENT DUAL OUTPUT
710-DC1822B_REV01
HIGH CURRENT DUAL OUTPUT
710-DC1822B_REV01
12
Rev 0
DEMO MANUAL DC1822B
ANALOG DEVICES, INC. 2019
05/19
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.
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