Linear Technology DC1755A Quick setup guide

1
dc1755af
DEMO MANUAL DC1755A
DESCRIPTION
LTC3860EUH
Wide Input Range,
High Efficiency Step-Down
DC/DC Converter
Demonstration circuit DC1755A provides the user with
twohighcurrentdualphasesynchronousbuckconverters
driven by the LTC3860. These buck converters provide
outputs of 1.5V/50A and 1.2V/50A over an input voltage
range of 6V to 14V and a switching frequency of 500kHz.
The board can be easily modified for a 4-phase, single VO,
100A supply. The power stage for each phase consists
of the tri-state PWM compatible 6mm × 6mm Fairchild
DrMOS module and a 0.47μH 13.2mm × 12.8mm iron
powder type inductor from Würth. A high density, two
sideddrop-inlayoutisused.Theentireconverter,excluding
the bulk output and input capacitors, fits within a 2.25” ×
1.38” area on the board.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
PERFORMANCE SUMMARY
The main features of the board are listed below:
• High efficiency and high current density.
• Remote sensing for each output.
• Optional resistors to tie the two outputs together.
• Connectorandheadertotietwoormoreboardstogether
for up to 12-phase operation.
• RUN, PGOOD and TRACK/SS pins for each output.
• CLKIN and CLKOUT pins.
• Onboard bias voltage regulator.
• BNC connectors to monitor each output voltage.
Design files for this circuit board are available at
http://www.linear.com/demo
(TA= 25°C), no airflow.
PARAMETER CONDITIONS VALUE
Minimum Input Voltage 6V
Maximum Input Voltage 14V
Output Voltage VOUTA IOUTA = 0A to 50A, VIN = 6V to 14V 1.5V ± 2%
Output Voltage VOUTB IOUTB = 0A to 50A, VIN = 6V to 14V 1.2V ± 2%
VOUTA Maximum Output Current, IOUTA VIN = 6V to 14V, VOUTA = 1.5V 50A
VOUTB Maximum Output Current, IOUTB VIN = 6V to 14V, VOUTB = 1.2V 50A
Nominal Switching Frequency 500kHz
Efficiency
See Figures 2 and 3
VOUTA = 1.5V, IOUTA = 50A, VIN = 12V 90.2% Typical
VOUTB = 1.2V, IOUTB = 50A, VIN = 12V 89.2% Typical

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dc1755af
DEMO MANUAL DC1755A
QUICK START PROCEDURE
Demonstration circuit 1755A is easy to set up to evalu-
ate the performance of the LTC3860EUH. Please refer to
Figure 1 for proper measurement equipment setup and
follow the procedure below.
1) With power off, connect the input supply, load and
meters as shown in Figure 1. Preset the load to 0A and
V
IN supply to be 0V. Place jumpers in the following
positions:
JP1 RUNA ON
JP2 RUNB ON
JP3 INT PWR BLK BIAS ON
2) Adjust the input voltage to be between 6V to 14V. VOUTA
should 1.5V ± 2%.
V
OUTB should 1.2V ± 2%.
3) Next, apply 50A load to each output and remeasure
V
OUT.
4) OncetheDCregulationisconfirmed,observetheoutput
voltage ripple, load step response, efficiency and other
parameters.
Note 1. No airflow is required at room temperature with
50A on both outputs. But for ambient temperatures higher
than 30°C, a cooling fan is recommended.
Note 2. Use the BNC connectors labeled VOUTA or VOUTB
to measure the output voltage ripple.
Note 3. Do not apply the load from the VOSA+turret to
the VOSA–turret or from the VOSB+turret to the VOSB–
turret. These turrets are only intended to monitor the
voltage across COUT3 and COUT13 respectively. Heavy
load currents applied across these turrets may damage
the converter.
DYNAMIC LOAD CIRCUIT (OPTIONAL)
Demonstration circuit 1755A provides a simple load step
circuit consisting of a MOSFET and sense resistor for each
rail. To apply a load step, follow the steps below.
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
amplitude of the pulse generator output to provide the
desired load step pulse height. The scaling for the load
step signal is 10mV/A.

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dc1755af
DEMO MANUAL DC1755A
Figure 1. Proper Measurement Equipment Setup
IOUTA
A
-
+
A
IIN
VIN
supply
V
+-
VOUTA
+
-V
*
*
VOUTA
load VOUTB load
A IOUTB
V VOUTB
*
+
-
VIN
Monitor voltage across COUT7
and COUT19 for accurate
efficiency measurements.
+
--
+
DC1755a F01
QUICK START PROCEDURE

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dc1755af
DEMO MANUAL DC1755A
Figure 2. Efficiency Curves for the 1.5V Rail of the DC1755A Figure 3. Efficiency Curves for the 1.2V Rail of the DC1755A
Figure 4. Load Step Response of the 1.5V Rail Figure 5. Load Step Response of the 1.2V Rail
LOAD CURRENT (A)
0
85
80
95
DC1755a F02
10 20 30 40 6050
75
90
EFFICIENCY (%)
VIN = 6V
VIN = 10V
VIN = 12V
VIN = 14V
LOAD CURRENT (A)
0
85
80
95
DC1755a F03
10 20 30 40 6050
75
90
EFFICIENCY (%)
VIN = 6V
VIN = 10V
VIN = 12V
VIN = 14V
SINGLE OUTPUT/4-PHASE OPERATION
A single output/4-phase converter may be preferred for
higher output current applications. The optional compo-
nents required to tie the phases together are found on
sheet3oftheschematicinthelowerrighthandcorner.Totie
thetwooutputstogether,makethefollowingmodifications:
1) Select one rail to be the master.
a) If VOUTA is the master, then stuff 0Ω at R103 to
disable the error amplifier for VOUTB.
b)If VOUTB is the master, then stuff 0Ω at R104 to
disable the error amplifier for VOUTA.
2) Stuff 0Ω at R87, R88, R89 and R91 to tie the IAVG,
COMP, TRACK/SS and RUN signals together.
3) Remove the redundant compensation components.
6-PHASE AND 12-PHASE OPERATION
Twoormoreboardsmaybetiedtogetherforupto12-phase
operation.Toparalleltwoormoreboards,placetheboards
side by side. Connect J9 of one board to J10 of the ad-
jacent board (see sheet 3 of the schematic, lower right
hand corner). This will tie the IAVG, COMP, TRACK/SS and
DC1755a F04
25A
LOAD STEP
10A/DIV
1.5VO(AC)
50mV/DIV
20μs/DIV
50A
77mV
DC1755a F05
25A
LOAD STEP
10A/DIV
1.2VO(AC)
50mV/DIV
20μs/DIV
50A
81mV
QUICK START PROCEDURE

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dc1755af
DEMO MANUAL DC1755A
Figure 6. Typical Setup for a 6-Phase + 2-Phase Converter
RUN signals of the adjacent boards together. Next, locate
the exposed copper shapes on the four corners of the
board on the top and bottom layers. Use these shapes to
tie the VOUT, VIN and GND planes of the adjacent boards.
Next, select which phases will be the master or the slave.
Figure 6 shows the typical setup for a 6-phase + 2-phase
converter. Figure 7 shows the typical setup for a 12-phase
converter. For additional help and support, contact your
local LTC sales office.
BOARD #2
SIDE A = SLAVE
SIDE B = INDEPENDENT DUAL PHASE RAIL
R87, R88, R89, R91 = NOT STUFFED
R101, R102 = NOT STUFFED
R103 = NOT STUFFED
R104 = 0
Cu
GND GND
TOP
BOTTOM
BOARD #1 BOARD #2
BOARD #2 BOARD #1
BOARD #1 = MASTER
R87, R88, R89, R91 = 0
R101, R102 = 0.0m
R103 = 0
R104 = NOT STUFFED
Cu
Cu
Cu
6 PHASE
CONVERTER
6 PHASE
CONVERTER
2 PHASE
CO
NVERTER
DC1755a F06
QUICK START PROCEDURE

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dc1755af
DEMO MANUAL DC1755A
Figure 7. Typical Setup for a 12-Phase Converter
Cu
GND GND GND
TOP
BOTTOM
BOARD #1 BOARD #2 BOARD #3
BOARD #3 BOARD #2 BOARD #1
BOARD #1 = MASTER
R87, R88, R89, R91 = 0
R101, R102 = 0.0m
R103 = 0
R104 = NOT STUFFED
BOARD #2 = SLAVE
R87, R88, R89, R91 = 0
R101, R102 = 0.0m
R103, R104 = 0
BOARD #3 = SLAVE
R87, R88, R89, R91 = 0
R101, R102 = 0.0m
R103, R104 = 0
Cu
Cu Cu
Cu Cu
Cu Cu
DC1755a F07
QUICK START PROCEDURE

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dc1755af
DEMO MANUAL DC1755A
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 1 CIN1 CAP, 180μF 20% 16V OSCON SANYO 16SVP180MX
2 4 CIN3, CIN5, CIN7, CIN9 CAP, 1210 22μF 20% 16V X5R TDK C3225X5R1C226M
3 12 COUT1 to COUT3, COUT4 to COUT6,
COUT11 to COUT13, COUT14 to COUT16 CAP, 7343 330μF 20% 2.5V POSCAP SANYO 2R5TPE330M9L
4 8 COUT7 to COUT10, COUT17 to COUT20 CAP, 1206 100μF 20% 6.3V X5R MURATA GRM31CR60J107ME39L
5 2 C1 to A, C1 to B CAP, 0603 470pF 10% 25V NPO AVX 06033A471KAT2A
6 8 C1, C8, C9, C10, C13, C20, C21, C22 CAP, 0603 0.22μF 10% 25V X7R TDK C1608X7R1E224K
7 8 C2, C11, C14, C23, C31, C32, C33, C34 CAP, 0603 2.2μF 10% 16V X7R MURATA GRM188R61C225KE15
8 2 C4, C16 CAP, 0603 100pF 5% 25V NPO AVX 06033A101JAT2A
9 2 C2 to A, C2 to B CAP, 0603 68pF 5% 25V NPO AVX 06033A680JAT2A
10 2 C3 to A, C3 to B CAP, 0603 2200pF 25V X7R MURATA GRM188R71E222MA01
11 3 C7, C19, C28 CAP, 0603 1μF 20% 25V X5R AVX 06033D105MAT2A
12 4 L1, L2, L3, L4 IND, 0.47μH 20% WÜRTH 744355147
13 1 RB to A RES, 0603 13.3k 1% 1/10W VISHAY CRCW060313K3FKEA
14 1 RB to B RES, 0603 20k 1% 1/10W NIC NRC06F2002TRF
15 19 R1, R11, R12, R16, R20, R25, R36, R45, R46,
R50, R54, R55, R59, R62, R69, R112, R113,
R116, R118
RES, 0603 0Ω JUMPER VISHAY CRCW06030000Z0EA
16 2 R1 to A, R1 to B RES, 0603 20k 1% 1/10W NIC NRC06F2002TRF
17 6 R2, R17, R37, R51, R57, R107 RES, 0603 1Ω 5% 1/10W VISHAY CRCW06031R00JNEA
18 2 R2 to A, R2 to B RES, 0603 6.8k 1% 1/10W VISHAY CRCW06036K80FKEA
19 2 R3 to A, R3 to B RES, 0603 523Ω 1% 1/10W VISHAY CRCW0603523RFKEA
20 9 R3, R4, R24, R26, R31, R38, R39, R61, R63 RES, 0603 10k 1% 1/10W VISHAY CRCW060310K0FKEA
21 2 R8, R43 RES, 0603 100k 5% 1/10W YAGEO RC0603JR-07100KL
22 4 R15, R33, R49, R70 RES, 0603 2.87k 1% 1/10W VISHAY CRCW06032K87FKEA
23 2 R18, R52 RES, 0603 59.0k 1% 1/10W VISHAY CRCW060359K0FKEA
24 4 R19, R21, R53, R56 RES, 0603 10Ω 1% 1/10W NIC NRC06F10R0TRF
25 2 R30, R67 RES, 0603 40.2k 1% 1/10W VISHAY CRCW060340K2FKEA
26 2 U1, U2 IC, DUAL OUTPUT BUCK CONVERTER LINEAR TECHNOLOGY LTC3860EUH
27 4 U3, U4, U5, U6 INTEGRATED MOSFET, DC/DC CONVERTER FAIRCHILD FDMF6707B
Bias Supply and UVLO Circuit
1 1 C29 CAP, 0603 2.2μF 10% 16V X7R MURATA GRM188R61C225KE15
2 1 C25 CAP, 0603 1μF 20% 25V X5R AVX 06033D105MAT2A
3 1 C26 CAP, 0805 10μF 10% 25V NPO AVX 08053D106MAT2A
4 1 C27 CAP, 0603 0.1μF 10% 16V X7R AVX 0603YC104KAT2A
5 1 C30 CAP, 0603 10pF 5% 50V NPO MURATA GQM1885C1H100JB01
6 1 D1 DIODE, BAV170 SOT23 DIODES INC., BAV170
7 1 D2 DIODE SHOTTKY SOD326 NXP PMEG2005AEA
8 1 L5 INDUCTOR 27μH 20% WÜRTH 7447789127
9 1 R105 RES, 0603 20k 1% 1/10W NIC NRC06F2002TRF
10 1 R106 RES, 0603 10k 1% 1/10W VISHAY CRCW060310K0FKEA

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dc1755af
DEMO MANUAL DC1755A
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
11 1 R90 RES, 1206 0Ω JUMPER VISHAY CRCW12060000Z0EA
12 1 R93 RES, 0603 100Ω 5% 1/10W VISHAY CRCW0603100RFKEA
13 1 R97 RES, 0603 105k 1% 1/10W VISHAY CRCW0603105KFKEA
14 1 R100 RES, 0603 127k 1% 1/10W VISHAY CRCW0603127KFKEA
15 1 U7 IC, STEP DOWN REGULATOR, DFN LINEAR TECHNOLOGY LT3502EDC
16 1 U8 IC, VOLTAGE MONITOR, DC-3 LINEAR TECHNOLOGY LT6703IDC-3
Additional Circuit Components
1 0 CIN2 CAP, SANYO SVP-F8 OPTIONAL
2 0 CIN4, CIN6, CIN8, CIN10 to CIN12 CAP, 1210 OPTIONAL
3 0 COUT21 to COUT26, COUT31 to COUT36 CAP, 7343H OPTIONAL
4 0 COUT27 to COUT30, COUT37 to COUT48 CAP, 1206 OPTIONAL
5 0 R5, R6, R7, R9, R10, R13, R14, R23, R27,
R28, R29, R32, R34, R35, R40, R41, R42, R44,
R47, R48, R58, R60, R64, R65, R66, R68, R71,
R72, R87, R88, R89, R91, R92, R94, R95, R96,
R103, R104, R108, R110, R111, R114, R115,
R117, R119
RES, 0603 OPTIONAL
6 0 C3, C5, C6, C12, C15, C17, C18, C24 CAP, 0603 OPTIONAL
7 0 Q2, Q3 MOSFET, TO-252 OPTIONAL
8 0 R73, R74, R77, R78, R83, R84, R85, R86 RES, 0603 OPTIONAL
9 0 R80, R82, R101, R102 RES, 2010 OPTIONAL
10 2 Q1, Q4 MOSFET, TO-252 VISHAY SUD50N03-09P
11 2 R75, R76 RES, 0603 10k 1% 1/10W VISHAY CRCW060310K0FKEA
12 2 R79, R81 RES, 2010 0.010Ω 2% 1W IRC LRC-LRF2010LF-01-R010-F
Hardware/Components (For Demo Board Only)
1 4 STANDOFF, SNAP ON KEYSTONE 8831
2 12 NUT, BRASS #10-32 ANY
3 6 RING, LUG #10 KEYSTONE 8205
4 6 WASHER, TIN, PLATED BRASS ANY
5 24 E1 to E11, E14, E16, E17 to E27 TURRET MILL MAX 2501-2-00-80-00-00-07-0
6 3 JP1 to JP3 HEADER, 3 PIN SAMTEC TMM-103-02-L-S
7 3 XJP1 to XJP3 SHUNT, 2mm CTRS SAMTEC 2SN-BK-G
8 6 J1 to J4, J11, J12 STUD, TEST PIN PEM KFH-032-10
9 2 J7, J8 CON, BNC, 5 PINS CONNEX 112404
10 1 J9 HEADER, DOUBLE ROW, RIGHT ANGLE MILL-MAX 802-40-008-20-001000
11 1 J10 SOCKET, DOUBLE ROW MILL-MAX 803-43-008-20-001000

9
dc1755af
DEMO MANUAL DC1755A
SCHEMATIC DIAGRAM
A A
B B
C C
D D
E
E
4 4 3 3 2 2
1 1
FSWITCH = 500kHz TYPICAL
PHASES 1 AND 2
CAPACITORS AND RESISTORS ARE 0603 UNLESS OTHERWISE SPECIFIED.
VCCA
5VBIAS
CLKOUTA
VCCA
VCCA
VIN
VIN
VDIFA
IAVGA
COMPA
ILIMA
VCCA
VCCA
THDN1
DISBL#1
PWMEN1
PWMEN2
THDN2
DISBL#2
VOSA-
VOA+
FBA
CLKINA
VIN
RUNA
VOB+
VCCA
TRACK/SSA
VCCA
VOSA+
VIN
VIN
VDIFA
5VBIAS
5VBIAS
VOSA-
VOSA+
REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
MIKE S
PRODUCTION 11-82-902
__
REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
MIKE S
PRODUCTION 11-82-902
__
REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
MIKE S
PRODUCTION 11-82-902
__
SIZE DATE:
.VER.ONCI
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] McCarthy Blvd. LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY 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 LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
2
Monday, January 16, 2012
13
DUAL OUTPUT 4 -PHASE STEP-DOWN CONVERTER
AK
MIKE S.
N/A
LTC3860EUH
DEMO CIRCUIT 1755A
SIZE DATE:
.VER.ONCI
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] McCarthy Blvd. LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY 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 LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
2
Monday, January 16, 2012
13
DUAL OUTPUT 4 -PHASE STEP-DOWN CONVERTER
AK
MIKE S.
N/A
LTC3860EUH
DEMO CIRCUIT 1755A
SIZE DATE:
.VER.ONCI
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] McCarthy Blvd. LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY 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 LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
2
Monday, January 16, 2012
13
DUAL OUTPUT 4 -PHASE STEP-DOWN CONVERTER
AK
MIKE S.
N/A
LTC3860EUH
DEMO CIRCUIT 1755A
R6 OPTR6 OPT
U1
LTC3860EUH
U1
LTC3860EUH
VCC
1
FB1
2
COMP1
3
VSNSOUT
4
VSNSN
5
VSNSP
6
COMP2
7
FB2
8
TRK/SS2
9
RUN2 17
ILIM2 18
PWM2
16
ISNS1N 21 ISNS2N 20
ISNS1P 22
ILIM1 23
RUN1 24
PWM1 25
IAVG 28
ISNS2P 19
FREQ
10
CLKIN
11
CLKOUT
12
PHSMD
13
PGOOD2
14
PWMEN2
15 PWMEN1 26
PGOOD1 27
SGND 29
SGND 30
VINSNS 31
TRK/SS1 32
GND
33
L2
0.47uH 744355147
WURTH EL.
L2
0.47uH 744355147
WURTH EL.
FDMF6707B
U3
FDMF6707B
U3
SMOD# 1
VCIN 2
VDRV 3
BOOT 4
CGND 5
GH 6
PHASE 7
NC 8
VIN 9
VIN 10
VIN
11
VIN
12
VIN
13
VIN
14
VSWH
15
PGND
16
PGND
17
PGND
18
PGND
19
PGND
20
PGND
21
PGND
22
VSWH 31
PGND
23
PGND
24
PGND
25
PGND
26
PGND
27
PGND
28
VSWH
29 VSWH
30
VSWH 32 VSWH 33 VSWH 34
VSWH 35
GL 36
CGND 37
THWN 38
DISB# 39
PWM 40
VSWH
43
VIN 42
GND 41
E6 VOSA- E6 VOSA-
COUT7
100uF
6.3V 1206
COUT7
100uF
6.3V 1206
JP1
ON OFF
RUNA
JP1
ON OFF
RUNA
1 3
2
CIN12
OPT
1210
CIN12
OPT
1210
L1
0.47uH
744355147
WURTH EL.
L1
0.47uH
744355147
WURTH EL.
R7 OPT R7 OPT
CIN4
OPT
1210
CIN4
OPT
1210
R11 0 R11 0
C12 OPT C12 OPT
R16
0
R16
0
E7
CLKINA E7 CLKINA
R30 40.2K R30 40.2K
R12 0 R12 0
RB-A 13.3K
1%
RB-A 13.3K
1%
C32
2.2uF
16V C32
2.2uF
16V
R15
2.87K 1%
R15
2.87K 1%
C7
1uF
C7
1uF
R29
OPT
R29
OPT
FDMF6707B
U4
FDMF6707B
U4
SMOD# 1
VCIN 2
VDRV 3
BOOT 4
CGND 5
GH 6
PHASE 7
NC 8
VIN 9
VIN 10
VIN
11
VIN
12
VIN
13
VIN
14
VSWH
15
PGND
16
PGND
17
PGND
18
PGND
19
PGND
20
PGND
21
PGND
22
VSWH 31
PGND
23
PGND
24
PGND
25
PGND
26
PGND
27
PGND
28
VSWH
29 VSWH
30
VSWH 32 VSWH 33 VSWH 34
VSWH 35
GL 36
CGND 37
THWN 38
DISB# 39
PWM 40
VSWH
43
VIN 42
GND 41
R35
OPT
R35
OPT
R27 OPT R27 OPT
R110
OPT
R110
OPT
R18 59.0k R18 59.0k
E9
GND E9 GND
C2
2.2uF
16V
C2
2.2uF
16V
CIN11
OPT
1210
CIN11
OPT
1210
R13
OPT
R13
OPT
C11
2.2uF
16V C11
2.2uF
16V
R17
1
R17
1
R26
10K
R26
10K
R31
10k
R31
10k
R8
100K
R8
100K
E5 VOSA+ E5 VOSA+
R1 0R1 0
C2-A
68pF
C2-A
68pF
R4 10K R4 10K
+
COUT4
330uF
2.5V
+
COUT4
330uF
2.5V
R20 0R20 0
R21R21
R5
OPT
R5
OPT
R34 OPT R34 OPT
R117
OPT
R117
OPT
C4
100pF
C4
100pF
E4
TRACK/SSA E4 TRACK/SSA
R116
0
R116
0
R3-A 523 R3-A 523
TP1TP1
R28
OPT
R28
OPT
R33
2.87K
1%
R33
2.87K
1%
C31
2.2uF
16V
C31
2.2uF
16V
CIN6 OPT
1210
CIN6 OPT
1210
C1
0.22uF
C1
0.22uF
R23 OPT R23 OPT
CIN5 22uF 16V
1210
CIN5 22uF 16V
1210
R10 OPT R10 OPT
R3
10K
R3
10K
C5
OPT
C5
OPT
E3
PGOODA
E3
PGOODA
C6
OPT
C6
OPT
COUT8
100uF
6.3V
1206
COUT8
100uF
6.3V
1206
R2-A 6.8k R2-A 6.8k
+
COUT2
330uF
2.5V
+
COUT2
330uF
2.5V
R21
10
R21
10
J1 VIN
6V - 14V
J1 VIN
6V - 14V
R107
1R107 1
COUT9
100uF
6.3V
1206
COUT9
100uF
6.3V
1206
J4 GNDJ4 GND
C9
0.22uF
C9
0.22uF
R25 0R25 0
+
COUT1
330uF
2.5V
+
COUT1
330uF
2.5V
R24 10K R24 10K
CIN3 22uF 16V 1210 CIN3 22uF 16V 1210
C8
0.22uF
C8
0.22uF
+
COUT5
330uF
2.5V
+
COUT5
330uF
2.5V
R19 10 R19 10
+
CIN1 180uF
16V
+
CIN1 180uF
16V
+
COUT6
330uF
2.5V
+
COUT6
330uF
2.5V
C3-A 2200pF C3-A 2200pF
COUT10
100uF
6.3V
1206
COUT10
100uF
6.3V
1206
E1 VIN+ E1 VIN+
TP2TP2
C10
0.22uF
C10
0.22uF
C1-A
470pF
C1-A
470pF
J2 GND J2 GND
R32
OPT
R32
OPT
R1-A
20K 1%
R1-A
20K 1%
+
COUT3
330uF
2.5V
+
COUT3
330uF
2.5V
C3 OPT C3 OPT
E2 VIN- E2 VIN-
R14
OPT
R14
OPT
E8 GND E8 GND
+
CIN2
OPT
+
CIN2
OPT
R9 OPT R9 OPT
J3 VOUTA
1.5V / 50A
J3 VOUTA
1.5V / 50A
R112
0
R112
0

10
dc1755af
DEMO MANUAL DC1755A
SCHEMATIC DIAGRAM
A A
B B
C C
D D
E
E
4 4 3 3 2 2
1 1
PHASES 3 AND 4
FSWITCH = 500kHz TYPICAL
VDIFB
PWMEN4
ILIMB
THDN4
VCCB
DISBL#4
VCCB
PWMEN3
IAVGB
VIN
VCCB
5VBIAS
VDIFB
VCCB
THDN3
VCCB
VCCB
DISBL#3
COMPB
CLKOUTB
CLKOUTA
FBB
VIN
VCCB
RUNB
TRACK/SSB
VIN VIN
VOSB+
VOSB-
VOB+
RUNB
5VBIAS 5VBIAS
VOSB+
VOSB-
SIZE DATE:
.VER.ONCI
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] McCarthy Blvd. LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY 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 LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
2
Monday, January 16, 2012
23
DUAL OUTPUT 4 -PHASE STEP-DOWN CONVERTER
AK
MIKE S.
N/A
LTC3860EUH
DEMO CIRCUIT 1755A
SIZE DATE:
.VER.ONCI
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] McCarthy Blvd. LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY 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 LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
2
Monday, January 16, 2012
23
DUAL OUTPUT 4 -PHASE STEP-DOWN CONVERTER
AK
MIKE S.
N/A
LTC3860EUH
DEMO CIRCUIT 1755A
SIZE DATE:
.VER.ONCI
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] McCarthy Blvd. LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY 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 LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
2
Monday, January 16, 2012
23
DUAL OUTPUT 4 -PHASE STEP-DOWN CONVERTER
AK
MIKE S.
N/A
LTC3860EUH
DEMO CIRCUIT 1755A
C13
0.22uF
C13
0.22uF
C17
OPT
C17
OPT
R36 0R36 0
E27 VOSB- E27 VOSB-
R113
0
R113
0
R54 0R54 0 R61
10K
R61
10K
E10
PGOODB E10 PGOODB
+
COUT13
330uF
2.5V
+
COUT13
330uF
2.5V
COUT18 100uF
6.3V 1206
COUT18 100uF
6.3V 1206
U2
LTC3860EUH
U2
LTC3860EUH
VCC
1
FB1
2
COMP1
3
VSNSOUT
4
VSNSN
5
VSNSP
6
COMP2
7
FB2
8
TRK/SS2
9
RUN2 17
ILIM2 18
PWM2
16
ISNS1N 21 ISNS2N 20
ISNS1P 22
ILIM1 23
RUN1 24
PWM1 25
IAVG 28
ISNS2P 19
FREQ
10
CLKIN
11
CLKOUT
12
PHSMD
13
PGOOD2
14
PWMEN2
15 PWMEN1 26
PGOOD1 27
SGND 29
SGND 30
VINSNS 31
TRK/SS1 32
GND
33
C22
0.22uF
C22
0.22uF
R38 10K R38 10K
CIN7
22uF
16V
1210
CIN7
22uF
16V
1210
R3-B 523 R3-B 523
R119
OPT
R119
OPT
R47
OPT
R47
OPT
R49
2.87K
1%
R49
2.87K
1%
R111 OPT R111 OPT
R45 0 R45 0
R60 OPT R60 OPT
C33
2.2uF
16V
C33
2.2uF
16V
R69 0R69 0
R46
0
R46
0
R65
OPT
R65
OPT
R53
10
R53
10
R39
10K
R39
10K
C15
OPT
C15
OPT
R2-B 6.8k R2-B 6.8k
C16
100pF
C16
100pF
C24
OPT
C24
OPT
E16
GND E16 GND
C20
0.22uF
C20
0.22uF
R118
0
R118
0
R63
10K
R63
10K
R56
10
R56
10
+
COUT15
330uF
2.5V
+
COUT15
330uF
2.5V
E11
TRACK/SSB E11 TRACK/SSB
CIN8
OPT
1210
CIN8
OPT
1210
R48
OPT
R48
OPT
R66
OPT
R66
OPT
C21 0.22uF C21 0.22uF
COUT17
100uF
6.3V
1206
COUT17
100uF
6.3V
1206
R59 0R59 0
FDMF6707B
U5
FDMF6707B
U5
SMOD# 1
VCIN 2
VDRV 3
BOOT 4
CGND 5
GH 6
PHASE 7
NC 8
VIN 9
VIN 10
VIN
11
VIN
12
VIN
13
VIN
14
VSWH
15
PGND
16
PGND
17
PGND
18
PGND
19
PGND
20
PGND
21
PGND
22
VSWH 31
PGND
23
PGND
24
PGND
25
PGND
26
PGND
27
PGND
28
VSWH
29 VSWH
30
VSWH 32 VSWH 33
VSWH 34
VSWH 35
GL 36
CGND 37
THWN 38
DISB# 39
PWM 40
VSWH
43
VIN 42
GND 41
J11 VOUTB
1.2V / 50A
J11 VOUTB
1.2V / 50A
+
COUT11
330uF
2.5V
+
COUT11
330uF
2.5V
R42 OPT R42 OPT
L4
0.47uH
744355147
WURTH EL.
L4
0.47uH
744355147
WURTH EL.
TP4TP4
C1-B
470pF
C1-B
470pF
R68 OPT R68 OPT
R44
OPT
R44
OPT
C18
OPT
C18
OPT
R72
OPT
R72
OPT
R62 0R62 0
R58 OPT R58 OPT
R70
2.87K
1%
R70
2.87K
1%
R371R371
R64 OPT R64 OPT
R51 1R51 1
C2-B
68pF
C2-B
68pF
CIN10
OPT
1210
CIN10
OPT
1210
JP2
ON
OFF
RUNB
JP2
ON
OFF
RUNB
1 3 2
L3
0.47uH
744355147
WURST EL.
L3
0.47uH
744355147
WURST EL.
R571R571
R40 OPT R40 OPT
C19
1uF
C19
1uF
R1-B 20K 1% R1-B 20K 1%
RB-B
20.0K
1%
RB-B
20.0K
1%
E14
CLKOUTB E14 CLKOUTB
C14
2.2uF
16V
C14
2.2uF
16V
J12 GND J12 GND
C34 2.2uF
16V
C34 2.2uF
16V
CIN9
22uF
16V
1210
CIN9
22uF
16V
1210
R55 0 R55 0
R41 OPTR41 OPT
COUT19
100uF
6.3V 1206
COUT19
100uF
6.3V 1206
+
COUT14
330uF
2.5V
+
COUT14
330uF
2.5V
+
COUT16
330uF
2.5V
+
COUT16
330uF
2.5V
R50
0
R50
0
TP3TP3
R43
100K
R43
100K
C3-B 2200pF C3-B 2200pF
R67
40.2K
R67
40.2K FDMF6707B
U6
FDMF6707B
U6
SMOD# 1
VCIN 2
VDRV 3
BOOT 4
CGND 5
GH 6
PHASE 7
NC 8
VIN 9
VIN 10
VIN
11
VIN
12
VIN
13
VIN
14
VSWH
15
PGND
16
PGND
17
PGND
18
PGND
19
PGND
20
PGND
21
PGND
22
VSWH 31
PGND
23
PGND
24
PGND
25
PGND
26
PGND
27
PGND
28
VSWH
29 VSWH
30
VSWH 32 VSWH 33
VSWH 34
VSWH 35
GL 36
CGND 37
THWN 38
DISB# 39
PWM 40
VSWH
43
VIN 42
GND 41
R52 59.0k R52 59.0k
R71 OPT R71 OPT
+
COUT12
330uF
2.5V
+
COUT12
330uF
2.5V
C23
2.2uF
16V
C23
2.2uF
16V COUT20
100uF
6.3V
1206
COUT20
100uF
6.3V
1206
E26 VOSB+ E26 VOSB+

11
dc1755af
DEMO MANUAL DC1755A
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
SCHEMATIC DIAGRAM
A A
B B
C C
D D
E
E
4 4 3 3 2 2
1 1
DYNAMIC LOAD CIRCUIT FOR VOUTA
BIA SUPPLY & UVLO CIRCUIT
.XAMECLYCYTUD%5.XAMECLYCYTUD%5
DYNAMIC LOAD CIRCUIT FOR VOUTB
5V / 400mA
UVLO CIRCUIT
UVLO THRESHOLD = 5.5V RISING
LOAD STEP 10mV / Amp LOAD STEP
10mV / Amp
OPTIONAL COUT
PWM ENABLE CIRCUIT FOR NON-THREE STATE COMPATIBLE DRMOS
WURTH EL.7447789127
OPTIONAL COMPONENTS FOR SINGLE OUTPUT CONVERTER WITH 4,6 or 12 PHASES
RIGHT ANGLE HEADER
RIGHT ANGLE SOCKET
CONNECT TO PARALLEL DC1755A
CONNECT TO PARALLEL DC1755A
VIN
RUNB
RUNA
5VBIAS
VOA+ VOB+
VOA+ VOB+
PWMEN3
DISBL#1
PWMEN1 DISBL#3
DISBL#4DISBL#2 PWMEN4
PWMEN2
THDN1
THDN2
THDN3 THDN4
VIN
VIN
FBB
VOB+
TRACK/SSB
COMPB
VCCB
TRACK/SSA
IAVGB
RUNB
COMPA
FBA
VOA+
RUNA
IAVGA
VCCA
CLKINA CLKOUTB
5VBIAS
VOA+ VOB+
SIZE DATE:
.VER.ONCI
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] McCarthy Blvd. LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY 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 LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
2
Monday, January 16, 2012
33
DUAL OUTPUT 4 -PHASE STEP-DOWN CONVERTER
AK
MIKE S.
N/A
LTC3860EUH
DEMO CIRCUIT 1755A
SIZE DATE:
.VER.ONCI
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] McCarthy Blvd. LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY 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 LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
2
Monday, January 16, 2012
33
DUAL OUTPUT 4 -PHASE STEP-DOWN CONVERTER
AK
MIKE S.
N/A
LTC3860EUH
DEMO CIRCUIT 1755A
SIZE DATE:
.VER.ONCI
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] McCarthy Blvd. LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY 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 LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
2
Monday, January 16, 2012
33
DUAL OUTPUT 4 -PHASE STEP-DOWN CONVERTER
AK
MIKE S.
N/A
LTC3860EUH
DEMO CIRCUIT 1755A
C29
2.2uF
16V
C29
2.2uF
16V
COUT41
OPT
1206
COUT41
OPT
1206
VOUTB
J8 VOUTB J8
+
COUT31
7343H OPT
+
COUT31
7343H OPT
C28 1uF C28 1uF
C30 10pF C30 10pF
R76
10k
R76
10k
+
COUT34
7343H OPT
+
COUT34
7343H OPT
+
COUT26
7343H
OPT
+
COUT26
7343H
OPT
R86 OPT R86 OPT
E17
PULSE GEN A E17 PULSE GEN A
+
COUT21
7343H
OPT
+
COUT21
7343H
OPT
Q4
SUD50N03-09P
Q4
SUD50N03-09P
1
23
R92 OPTR92 OPT
R84 OPT R84 OPT
+
COUT36
7343H
OPT
+
COUT36
7343H
OPT
COUT43
OPT
1206
COUT43
OPT
1206
E25E25
R93 100 R93 100
R83 OPT R83 OPT
C27
0.1uF
16V
C27
0.1uF
16V
COUT39
OPT
1206
COUT39
OPT
1206
R94 OPTR94 OPT
R104 OPTR104 OPT
JP3
ON
OFF
INTERNAL BIAS
JP3
ON
OFF
INTERNAL BIAS
1 3
2
R88
OPT
R88
OPT
R114
OPT
R114
OPT
COUT37
OPT
1206
COUT37
OPT
1206
R81 0.010 1% 2010 R81 0.010 1% 2010
COUT28
OPT
1206
COUT28
OPT
1206
D2
PMEG4005AEA
D2
PMEG4005AEA
E22
GND E22 GND
COUT27
OPT
1206
COUT27
OPT
1206
+
COUT25
7343H
OPT
+
COUT25
7343H
OPT
R105
20K
R105
20K
R73 OPT R73 OPT
C26
10uF
C26
10uF D1
BAV170
SOT23
D1
BAV170
SOT23
3
1
2
E21
GND E21 GND
R79
0.010
1% 2010
R79
0.010
1% 2010
R108 OPT R108 OPT
COUT45
OPT
1206
COUT45
OPT
1206
R75
10k
R75
10k
R101
2010
OPT
R101
2010
OPT
COUT47
OPT
1206
COUT47
OPT
1206
Q1
SUD50N03-09P
Q1
SUD50N03-09P
1
23
R89
OPT
R89
OPT R91
OPT R91 OPT
+
COUT24
7343H
OPT
+
COUT24
7343H
OPT
U8
LT6703IDC-3
U8
LT6703IDC-3
OUT
1
VS
2
+INA
3GND 4
R96 OPTR96 OPT
E24 ISTEPB- E24 ISTEPB-
R103 OPT R103 OPT
R87
OPT
R87
OPT
COUT42
OPT
1206
COUT42
OPT
1206
+
COUT35
7343H OPT
+
COUT35
7343H OPT
R115
OPT
R115
OPT
R77 OPT R77 OPT
E23 ISTEPA- E23 ISTEPA-
EXPOSED
PAD
U7
LT3502EDC
EXPOSED
PAD
U7
LT3502EDC
VIN
1
BD
2
FB
3
SHDN
4GND 5
DA 6
BOOST 7
SW 8
GND
9
+
COUT33
7343H
OPT
+
COUT33
7343H
OPT
J9
MILL MAXX
802-40-008-20-001000
J9
MILL MAXX
802-40-008-20-001000
IAVGA 1
COMPA 2
TRACK/SSA 3
RUNA 4
SGND 5 SGND 6 SGND 7
CLKINA 8
COUT44
OPT
1206
COUT44
OPT
1206
COUT38
OPT 1206
COUT38
OPT 1206
J10
MILL MAXX 803-43-008-20-001000
J10
MILL MAXX 803-43-008-20-001000
IAVGB
1
COMPB
2
TRACK/SSB
3
RUNB
4
SGND
5
SGND
6
SGND
7
CLKOUTB
8
COUT30
OPT
1206
COUT30
OPT
1206
Q2
SUD50N03-09P OPT
Q2
SUD50N03-09P OPT
1
23
E19 ISTEPA+ E19 ISTEPA+
+
COUT23
7343H
OPT
+
COUT23
7343H
OPT
R106 10K R106 10K
E20 ISTEPB+ E20 ISTEPB+
R80
OPT
1%
2010 R80
OPT
1%
2010
R97
105K
R97
105K
R102
2010OPT
R102
2010OPT
Q3
SUD50N03-09P OPT
Q3
SUD50N03-09P OPT
1
23
R95 OPTR95 OPT
VOUTA
J7 VOUTA J7
E18
PULSE GEN B E18 PULSE GEN B
R85 OPT R85 OPT
L5
27uH
L5
27uH
COUT46
OPT
1206
COUT46
OPT
1206
COUT40
OPT
1206
COUT40
OPT
1206
R90
0
1206
R90
0
1206
R78 OPT R78 OPT
C25
1uF
C25
1uF
R82
OPT 1% 2010
R82
OPT 1% 2010
R100 127K
1%
R100 127K
1%
COUT48
OPT 1206
COUT48
OPT 1206
+
COUT32
7343H OPT
+
COUT32
7343H OPT
R74 OPT R74 OPT
COUT29
OPT
1206
COUT29
OPT
1206
+
COUT22
7343H
OPT
+
COUT22
7343H
OPT

12
dc1755af
DEMO MANUAL DC1755A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2012
LT 0112 • PRINTED IN USA
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions:
Thisdemonstration board(DEMO BOARD) kitbeing soldor provided byLinear Technologyis intendedfor useforENGINEERING DEVELOPMENT
OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete
in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety
measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union
directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.
If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date
of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU
OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS
FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR
ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims
arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all
appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or
agency certified (FCC, UL, CE, etc.).
No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance,
customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.
LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.
Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and
observe good laboratory practice standards. Common sense is encouraged.
This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC applica-
tion engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation

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