Linear Technology LTC4412 Quick setup guide

1
dc1635afc
DEMO MANUAL DC1635A
DESCRIPTION
LTC4412/LTC4414:
Dual Low Loss High Voltage
PowerPath Controllers
Demonstration circuit 1635A features the LT C
®
4412HVIS6
andLTC4414EMS8, low lossPowerPath™controllers.Each
controller is capable of automatically switching between
primary and auxiliary power sources for a single output.
There are two electrically isolated circuits, one for each IC,
for independent evaluation. The LTC4412 circuit is intended
for lower current loads, whiletheLTC4414 circuit iscapable
of driving larger PMOS devices for higher current loads.
The input supply voltage ranges are from 2.5V to 36V for
LTC4412 and 5V to 36V for LTC4414. As initially configured
with the default MOSFET, the LTC4412 circuit maximum
input voltage is 18V. The LTC4412 and LTC4414 circuit
current limits are 2A and 8A respectively.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
PERFORMANCE SUMMARY
The primary power paths can be controlled with external
logic applied to the CTL pins. PowerPath status can be
monitored using theSTAT pins. Evaluation of higher current
or more complex sourcing systems can be accomplished
by installing additional ICs, as well as paralleling the inputs
and/or outputs using the optional supplied pads. Multiple
standard MOSFET package options are also available on
each circuit for evaluation convenience.
Design files for this circuit board are available at
http://www.linear.com/demo/DC1635A
PARAMETER CONDITIONS VALUE UNIT
Minimum LTC4412 Input Voltage VIN1 2.5 V
Maximum LTC4412 Input Voltage VIN1 and VAUX1 18 V
LTC4412 Maximum Current MOSFET Limited 2 A
Minimum LTC4414 Input Voltage VIN2 and VAUX2 5 V
Maximum LTC4414 Input Voltage VIN2 and VAUX2 36 V
LTC4414 Maximum Current MOSFET Limited 8 A
Specifications are at TA= 25°C

2
dc1635afc
DEMO MANUAL DC1635A
QUICK START PROCEDURE
Demonstration circuit 1635A is easy to set up to evaluate
the performance of LTC4412 and LTC4414. Refer to Figure
1 for proper measurement equipmentsetupof bothcircuits
and follow the procedures below.
LTC4412 Circuit
1. With all power off, connect auxiliary (VAUX1) and primary
(VIN1) power supplies capable of 2A each, the system
load and meters as shown in Figure 1.
2. Preset the system load to 0A and the input supplies to
0V, 0A current limit.
3. Connect the system load to the output terminals, VOUT1
and GND1.
4. Turn on the supplies, setting the current limit up to 2A.
Adjust the voltages to the desired value, up to 18V. The
higher voltage of the two supplies should appear at the
output.
5. Turn the load on and adjust as necessary.
6. Adjust the suppliesandobservehowthe outputswitches
over to follow the higher voltage of the two sources.
LTC4414 Circuit
1. With all power off, connect auxiliary (VAUX2) and primary
(VIN2) power supplies capable of 8A each, the system
load, and meters as shown in Figure 1.
2. Preset the system load to 0A and the input supplies to
0V, 0A current limit.
3. Connect the system load to the output terminals, VOUT2
and GND2.
4. Turn on the supplies, setting the current limit up to 8A.
Adjust the voltages to the desired value, up to 36V. The
higher voltage of the two supplies should appear at the
output.
5. Turn the load on and adjust as necessary.
6. Adjust the suppliesandobservehowthe outputswitches
over to follow the higher voltage of the two sources.
Optional
7. For improved current handling, install additional MOS-
FETs, select from different package footprints, or shunt
the two circuits at VIN, VOUT and GND.
8. For source-load back-to-backisolation, removejumpers
JMP1 and JMP2, and/or JMP3 and JMP4, then install
additional MOSFETs back-to-back as shown in Figure2.
9. For external control of the primary source power path,
remove the 0Ω jumper on the CTL1 or CTL2 pin, R2 or
R5 respectively. Apply the logic-control signal on CTL1
or CTL2 as necessary.

3
dc1635afc
DEMO MANUAL DC1635A
QUICK START PROCEDURE
Figure 1. Test Setup of DC1635A
DC1635 F01
SYSTEM
LOAD 1
+
–
A
PRIMARY
SUPPLY 1
LTC4412
CIRCUIT
+
+
–
–
A
+
–
V
PRIMARY
SUPPLY 2
A
+
–
V
LTC4414
CIRCUIT
SYSTEM
LOAD 2
+
–
A
AUXILIARY
SUPPLY 1
+–
A
+–
V
AUXILIARY
SUPPLY 2
+–
+–
V
A

4
dc1635afc
DEMO MANUAL DC1635A
QUICK START PROCEDURE
U1
LTC4412HV
VIN
Q1B
SiA921EDJ
JMP2
0Ω
R2
0Ω
SENSE
VAUX1
VIN1
GND
CIN1
0.1µF R1
680k
COUT1
0.1µF
STAT1
VOUT1
GATE
CTL STAT
Q1A
SiA921EDJ
JMP1
0Ω
U2
LTC4414HV
VIN
Q3
Si7463DP
JMP4
0Ω
R5
0Ω
SENSE
VAUX2
VIN2
GND
CIN2
0.1µF R4
100k
COUT2
0.1µF
STAT2
DC1635 F02a
VOUT2
GATE
CTL STAT
Q2
Si7463DP
CIRCUIT A CIRCUIT B
JMP3
0Ω
Figure 2a. Standard Configurations with Automatic Switchover Between Sources
Figure 2b. Optional, Fully-Isolated Configurations with External Logic Control
U1
LTC4412HV
VIN
Q1B
SiA921EDJ
Q6B
SiA921EDJ
JMP6
0Ω
SENSE
VAUX1
VIN1
CTL1
GND
CIN1
0.1µF R1
680k
COUT1
0.1µF
STAT1
VOUT1
GATE
CTL STAT
Q1A
SiA921EDJ
Q6A
SiA921EDJ
DUAL PKG DUAL PKG
JMP5
0Ω
U2
LTC4414HV
VIN
Q3
Si7463DP
Q15
Si7463DP
JMP8
0Ω
SENSE
VAUX2
VIN2
CTL2
GND
CIN2
0.1µF R4
100k
COUT2
0.1µF
STAT2
DC1635 F02b
VOUT2
GATE
CTL STAT
Q2
Si7463DP
Q14
Si7463DP
JMP7
0Ω
Diodes shown are body diodes of their respective MOSFETs. Do not install extra diodes or the operation of the
power paths may be compromised.

5
dc1635afc
DEMO MANUAL DC1635A
QUICK START PROCEDURE
U1
LTC4412HV
VIN
Q8
Si7463DP
JMP5
0Ω
0Ω
SENSE
VIN1
CTL1
GND
CIN1
0.1µF GATE
CTL STAT
R1
680k
COUT1
0.1µF
STAT1
VOUT1
DC1635 F02c
U2
LTC4414HV
VIN
VIN2
BAT2
Q3
Si7463DP
JMP4
0Ω
R6
0Ω
SENSE
GND
CIN2
0.1µF GATE
CTL
GND2
STAT
R6
560k
COUT2
0.1µF
STAT2
VCC2
VOUT2
DC1635 F02d
+
U3
LTC4414HV
VIN
VIN1
VAUX1
BAT1
Q5
Si7463DP
FROM WALL
ADAPTER
SCHOTTKY
JMP2
0Ω
JMP1
0Ω
R2
0Ω
SENSE
GND
CIN1
0.1µF GATE
CTL STAT
R3
560k
COUT1
0.1µF
STAT1
X2
VOUT1 AND VOUT2
SHARED
X1
GND1 AND GND2
SHARED
VCC1
VOUT1
LOAD
+
U2
LTC4414HV
VIN
Q3
Si7463DP BAT2
JMP4
0Ω
SENSE
VIN2
CTL2
GND
GND2
CIN2
0.1µF GATE
CTL STAT
R6
560k
STAT2
VCC2
DC1635 F02e
+
U3
LTC4414HV
VIN
Q5
Si7463DP BAT1
JMP2
0Ω
SENSE
VIN1
CTL1
FROM
CHARGER
GND
X2
GND1 AND
GND2 SHARED
X1
VIN1 AND VIN2
SHARED
GND1
CIN1
0.1µF GATE
CTL STAT
R3
560k
STAT1
VCC1
+
Figure 2c. Optional, High Side Switch with Logic Control and Status Output
(Requires 0Ω Jumper Across Drain-Source Pins of Q7)
Figure 2d. Optional, High Current Dual Battery Load Sharing
with Automatic Switchover and Status Output
Figure 2e. Optional, Dual Battery Charging with Logic Select
and Status Output

6
dc1635afc
DEMO MANUAL DC1635A
SCHEMATIC DIAGRAMS
5
5
4
4
3
3
2
2
1
1
D D C C B B A A
DUAL PKG
*
*
NOTE FOR THIS PAGE:
*
*
TOP LAYER CIRCUITS FOR U1 AND U2 ARE ELECTRICALLY ISOLATED FROM EACH OTHER. THEY DO NOT SHARE GND, VIN, VAUX, OR VOUT. JUMPERS CAN BE USED TO PARALLEL THE TWO CIRCUITS AS NECESSARY. *CLARIFICATION: SHOWN HERE AS CONNECTED FOR TOP LAYER CIRCUIT, BUT STUFFED ON BOTTOM LAYER. # IF THE CTL PIN OF THE LTC4412 AND/OR LTC4414 IS NOT USED, IT IS RECOMENDED THAT CTL BE CONNECTED TO GND IN THE FINAL DESIGN.
ISOLATED
NOTE: UNLESS OTHERWISE SPECIFIED 1. ALL RESISTORS ARE IN OHMS, 0603. ALL CAPACITORS ARE IN MICROFARADS, 0603.
STAT1
S1A
VOUT2
GATE1
VCC2
S2A
VCC1
S1B
GATE2
S2B
VOUT1
VIN2
CTL2
VAUX2
CTL1
STAT2
VOUT2
S2B
CTL2
GATE2
VAUX2
VOUT1
S2A
S1A
GATE1
STAT2
S1B
VIN2
VIN1
VAUX1
STAT1
CTL1
SIZE DATE:
IC NO. REV.
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
Thursday, March 17, 2016
13
DUAL LOW LOSS 36V POWERPATH CONTROLLERS
AK
JOSH Y.
N/A
LTC4412HVIS6 & LTC4414EMS8
DEMO CIRCUIT 1635A
SIZE DATE:
IC NO. REV.
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
Thursday, March 17, 2016
13
DUAL LOW LOSS 36V POWERPATH CONTROLLERS
AK
JOSH Y.
N/A
LTC4412HVIS6 & LTC4414EMS8
DEMO CIRCUIT 1635A
SIZE DATE:
IC NO. REV.
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
Thursday, March 17, 2016
13
DUAL LOW LOSS 36V POWERPATH CONTROLLERS
AK
JOSH Y.
N/A
LTC4412HVIS6 & LTC4414EMS8
DEMO CIRCUIT 1635A
REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
JOSH Y.
2ND PROTOTYPE
2 03-17-16
REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
JOSH Y.
2ND PROTOTYPE
2 03-17-16
REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
JOSH Y.
2ND PROTOTYPE
2 03-17-16
E11 VOUT2
E6
GND2
E13
CTL1
R3
100K
R4 560K
(OPT)
J7
VIN2
5V - 36V @ 8A
COUT2
0.1uF
50V
0805
E8
GND2
J5
VAUX2
5V - 36V @ 8A
E2
GND1
R1
680K
COUT1
0.1uF
50V
0805
Q2 Si7463ADP
1 2
5
3
4
6 7 8
J11
VOUT2
5V - 36V @ 8A
J8
GND2
E9
VOUT1
E15
VCC1
J6
GND2
E7
VIN2
E14
STAT1
JMP3
E4
GND1
R5
0
E12 GND2
R6 0
E1
VAUX1
JMP2
J3
VIN1
2.5V - 18V @ 2A
E16 STAT2
CIN1
0.1uF
50V
0805
CIN2 0.1uF 50V 0805
U2 LTC4414EMS8
VIN
7
CTL
2STAT 1
SENSE 6
GND
3
NC 5
NC
4
GATE 8
JMP1
Q3 Si7463ADP
1 2
5
3
4
6 7 8
E18
CTL2
U1 LTC4412HVIS6
VIN
1
CTL
3STAT 4
SENSE 6
GND
2GATE 5
Q1A SiA921EDJ
6
2
1
7
E5
VAUX2
J2
GND1
JMP4 J12
GND2
J1
VAUX1
3V - 18V @ 2A
E17
VCC2
E10
GND1
E3
VIN1
Q1B SiA921EDJ
43
5
8
J10 GND1
R2 560K
(OPT)
J9
VOUT1 2.5V - 18V @ 2A
J4
GND1

7
dc1635afc
DEMO MANUAL DC1635A
SCHEMATIC DIAGRAMS
5
5
4
4
3
3
2
2
1
1
D D C C B B A A
OPTIONAL CIRCUIT
DUAL PKG
OPTIONAL CIRCUIT
ISOLATED
DUAL PKG
S1A
VAUX1
GATE2
S2A
CTL1
VOUT2
STJ1
GTJ1
CTL2 VIN2
GATE1
S1B
STAT1
VIN1
STAT2
VAUX2
VOUT1
S2B
GTJ2
S1A
STJ1
S2B
GATE2 STAT2 STAT1 VOUT2 GATE1
VAUX1
GTJ1 VOUT1VIN1
S1B
CTL2 VAUX2
CTL1
STJ2
VIN2
S2A
SIZE DATE:
IC NO. REV.
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
Thursday, March 17, 2016
23
DUAL LOW LOSS 36V POWERPATH CONTROLLERS
AK
JOSH Y.
N/A
LTC4412HVIS6 & LTC4414EMS8
DEMO CIRCUIT 1635A
SIZE DATE:
IC NO. REV.
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
Thursday, March 17, 2016
23
DUAL LOW LOSS 36V POWERPATH CONTROLLERS
AK
JOSH Y.
N/A
LTC4412HVIS6 & LTC4414EMS8
DEMO CIRCUIT 1635A
SIZE DATE:
IC NO. REV.
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
Thursday, March 17, 2016
23
DUAL LOW LOSS 36V POWERPATH CONTROLLERS
AK
JOSH Y.
N/A
LTC4412HVIS6 & LTC4414EMS8
DEMO CIRCUIT 1635A
Q7
Si7463ADP (OPT)
1 2
5
3
4
6 7 8
Q13B
OPT (SiA921EDJ)
4 3
5
8
U4 LTC4412HVIS6 (OPT)
VIN
1
CTL
3STAT 4
SENSE 6
GND
2GATE 5
Q12B OPT (SiA921EDJ)
43
5
8
Q4
Si7463ADP (OPT)
1 2
5
3
4
6 7 8
Q13A
OPT (SiA921EDJ)
6
2
17
Q12A OPT (SiA921EDJ)
6
2
1
7
Q5
Si7463ADP (OPT)
1 25 3
4
6 7 8
Q8
Si7463ADP (OPT)
1 25 3
4
6 7 8
U3 LTC4414EMS8 (OPT)
VIN
7
CTL
2STAT 1
SENSE 6
GND
3
NC 5
NC
4
GATE 8

8
dc1635afc
DEMO MANUAL DC1635A
SCHEMATIC DIAGRAMS
5
5
4
4
3
3
2
2
1
1
D D C C B B A A
DUAL PKG
ISOLATED
DUAL PKG DUAL PKG
OPTIONAL CIRCUIT
DUAL PKG
OPTIONAL CIRCUIT
NOTE FOR ALL CIRCUITS: THE DEMO BOARD AS SHIPPED SHOWS THE MOST COMMON FUNCTIONS FOR TWO ELECTRICALLY ISOLATED CIRCUITS. THIS DEMO BOARD WAS DESIGNED TO SHOW CASE THE MAXIMUM NUMBER OF EVALUATION OPTIONS THAT CORRESPOND TO THE CIRCUITS IN THE DATA SHEETS BOTH ICs. HOWEVER, THERE ARE SOME IMPORTANT RULES TO ALWAYS FOLOW: 1. NEVER INSTALL U1 (TOP LAYER) AND U3 (BOTTOM LAYER) AT THE SAME TIME. INSTALL ONE OR THE OTHER, BUT NOT BOTH. 2. NEVER INSTALL U2 (TOP LAYER) AND U4 (BOTTOM LAYER) AT THE SAME TIME. SAME AS 1. 3. JMP1-4 ARE MEANT FOR SIMPLE DIODE-OR OPERATION. THEY MUST BE REMOVED FOR PROPER BACK-TO-BACK ISOLATION. THERE ARE MORE GUIDELINES SPECIFICALLY FOR CERTAIN CIRCUITS. PLEASE SEE THE QUICK START GUIDE FOR MORE APPLICATIONS AND INFORMATION.
DUAL PKG
STJ1
GTJ1
VIN1
S1B
S2B S2A
VAUX1
STJ1 STJ2 GTJ2
STAT2 STJ2 GATE2 GTJ2
GTJ1
S2B
VOUT1
GATE2
GATE1
S1B
VIN1
S1A
VOUT2
S1A
S2A
S2A S2B
VOUT1
GATE1
VOUT2
VAUX1
VAUX2
VIN2
STAT1
STAT1
VOUT1
S1B
STAT2
GTJ2 STJ2
STJ1 GTJ1
SIZE DATE:
IC NO. REV.
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
Thursday, March 17, 2016
33
DUAL LOW LOSS 36V POWERPATH CONTROLLERS
AK
JOSH Y.
N/A
LTC4412HVIS6 & LTC4414EMS8
DEMO CIRCUIT 1635A
SIZE DATE:
IC NO. REV.
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
Thursday, March 17, 2016
33
DUAL LOW LOSS 36V POWERPATH CONTROLLERS
AK
JOSH Y.
N/A
LTC4412HVIS6 & LTC4414EMS8
DEMO CIRCUIT 1635A
SIZE DATE:
IC NO. REV.
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
Thursday, March 17, 2016
33
DUAL LOW LOSS 36V POWERPATH CONTROLLERS
AK
JOSH Y.
N/A
LTC4412HVIS6 & LTC4414EMS8
DEMO CIRCUIT 1635A
Q14
Si7463ADP
1 25 3
4
6 7 8
Q19B Si7905DN
3 5
4
6
Q18A
Si7905DN
7
2
1
8
Q6A
SiA921EDJ
6
2
17
JMP6 0
JMP7 0
Q16B
Si7905DN
35
4
6
JMP8 0
Q17A Si7905DN
7
2
18
Q19A Si7905DN
7
2
18
Q6B
SiA921EDJ
4 3
5
8
Q15
Si7463ADP
1 25 3
4
6 7 8
JMP5 0
Q16A
Si7905DN
7
2
1
8
Q18B
Si7905DN
35
4
6
Q17B Si7905DN
3 5
4
6

9
dc1635afc
DEMO MANUAL DC1635A
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.
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 4 COUT1, CIN1, COUT2, CIN2 CAP., X7R, 0.1µF, 50V, 10% 0805 AVX, 08055C104KAT2A
2 1 Q1 DUAL P-CHAN., 20V/4.5A VISHAY, SiA921EDJ-T1-GE3
3 2 Q2, Q3 MOSFET P-CHAN., 40V/10A VISHAY, Si7463DP-T1-GE3
4 1 R1 RES., CHIP, 690k, 1%, 0603 VISHAY, CRCW0603690KFKEA
5 1 R3 RES., CHIP, 100k, 1%, 0603 VISHAY, CRCW0603100KFKEA
6 2 R5, R6 RES., CHIP, 0Ω, 0603 VISHAY, CRCW06030000Z0EA
7 1 U1 I.C., LTC4412HVIS6 LINEAR TECH., LTC4412HVIS6#PBF
8 1 U2 I.C., LTC4414EMS8 LINEAR TECH., LTC4414EMS8#PBF
Additional Circuit Components
1 0 Q6, Q12, Q13 OPT VISHAY, SiA921EDJ-T1-GE3
2 0 Q4, Q5, Q7, Q8, Q14, Q15 OPT VISHAY, Si7463DP-T1-GE3
3 0 Q16, Q17, Q18, Q19 OPT VISHAY, Si7905DN-T1-E3
4 4 JMP1, JMP2, JMP3, JMP4 JUMPER, 1206 TEPRO, RN6087
5 2 R2, R4 RES., CHIP, 560k, 1%, 0603 VISHAY, CRCW0603560KFKEA
6 0 JMP5, JMP6, JMP7, JMP8 RES., 0603 OPT
7 0 U3 I.C., LTC4414EMS8 OPT LINEAR TECH., LTC4414EMS8#PBF
8 0 U4 I.C., LTC4412HVIS6 OPT LINEAR TECH., LTC4412HVIS6#PBF
Hardware-For Demo Board Only
1 18 E1, E2, E3, E4, E5, E6, E7, E8, E9, E10 TEST POINT, TURRET, 0.095" MILL-MAX, 2501-2-00-80-00-00-07-0
E11, E12, E13, E14, E15, E16, E17, E18 TEST POINT, TURRET, 0.095" MILL-MAX, 2501-2-00-80-00-00-07-0
2 12 J1, J2, J3, J4, J5, J6, J7, J8, J10, J11, J12 BANANA JACK KEYSTONE, 575-4
3 4 (STAND OFF) STAND OFF, NYLON 0.25" KEYSTONE, 8831 (SNAP ON)

10
dc1635afc
DEMO MANUAL DC1635A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2011
LT 0316 REV C • PRINTED IN USA
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions:
This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING 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