Linear Technology DC2160A Quick setup guide

1
dc2160af
DEMO MANUAL DC2160A
DESCRIPTION
LTC4419
18V Dual Input Micropower
PowerPath™ Prioritizer
Demonstration circuit 2160A uses the LTC
®
4419 to
providebackup switchover, keeping the output load
powered during brown out or power loss conditions.
Priority is assigned by supply connection to the V1 and
V2 inputs. The power source connected to V1 has a higher
priority and is monitored by undervoltage switchover
threshold comparator CADJ (pin ADJ). If V1 exceeds
1.55V and ADJ is above 1.097V for 64ms, V1 is considered
valid, and the LTC4419 connects V1 to the load. If V1
drops below 1.52V, or ADJ drops below 1.047V, V1 is
considered invalid, and the LTC4419 powers the load
from V2. The DC2160A is populated to provide switchover
when V1 drops below 10.19V±0.33V. The upper limit for
V1 is the maximum operating voltage, 18V; however, the
recommended V1 voltage is 12V. The resistive divider (R1-
R2) of the first auxiliary comparator CMP1 is adjusted to
trigger the comparator when VCMP1_TOP’s voltage is in
the 9.92V to 10.74V range. Practically, any voltage from
the operating range can be selected for V2, however, 5V
is recommended to have a standard voltage level.
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 second auxiliary comparator CMP2 divider (R8-R7) is
adjusted to trigger the comparator when VCMP2_TOP’s
voltage is in the 3.26V to 3.53V range. Overcurrent (0.5A
to 1.6A) and thermal protection inherent to the LTC4419
allows safe prioritization. Overtemperature protection is
activated when the junction temperature exceeds 125ºC.
Another inherent feature – reverse supply protection –
protects the prioritizer and load when a negative voltage
(up to –15V) is applied to any input – V1 or V2.
The LTC4419’s “break-before-make” switching method
prevents cross conduction between input channels. The
LTC4419 does not connect any input source to the load
until the input voltage exceeds the output by 50mV. This
eliminates reverse current fromtheoutput intotheselected
input supply.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2160A
Specifications are at TA= 25°C
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V1, V2, VOUT V1, V2, VOUT Operating Supply Range 1.8 18 V
RON Switch Resistance V1 = V2 = 5V, IOUT = –100μA 1 2 5 Ω
tVALID(V1) Input Qualification Time V1 Rising, ADJ Rising 34 64 94 ms
VTHA ADJ Threshold ADJ Falling 1.032 1.047 1.062 V
VHYSTA ADJ Comparator Hysteresis ADJ Rising 30 50 70 mV
VTHC CMP1, CMP2 Threshold CMP1, CMP2 Falling 0.378 0.387 0.396 V
VHYSTC CMP1, CMP2 Hysteresis CMP1, CMP2 Rising 7.5 10 12.5 mV
ILIM Current Limit V1 = V2 = 8.4V 0.5 1.1 1.6 A
VREV Reverse Comparator Threshold (V1, V2) – VOUT for Power Path Turn-On 25 50 75 mV
tSWITCH Switch Break-Before-Make Time V1 = V2 = 5V, IOUT < –10mA 1 2.5 5 µs
V1_SWITCHOVER Demo Board Switchover Voltage 9.6 9.92 10.24 V
V1_ALARM Demo Board V1 Alarmed Voltage 9.92 10.32 10.74 V
V2_ALARM Demo Board V2 Alarmed Voltage 3.26 3.38 3.53 V

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dc2160af
DEMO MANUAL DC2160A
OVERVIEW
TURRETS
JUMPERS
LEDS
The DC2160A includes the LTC4419 2-input pri-
oritizer(U1), LDO regulator with 2.5V output voltage
(U2-LT1763) for powering LEDs and logic, four LEDs
(D4-D7) for visual information, two jumpers (JP1, JP2)
for selecting the power source for the LDO, push but-
ton(SW1) for engaging freshness seal mode, and a few
turrets for connecting the board to power sources, load
and measuring instrument. Auxiliary components—LDO
and logic—are placed on the bottom side of board.
The DC2160A design permits operation of each channel
over its full operating voltage range.
Provision is made for increasing the hysteresis of auxil-
iary comparator 1 and auxiliary comparator 2 by placing
optional resistors R17/R19.
V1 (E1): 12V supply input; should not exceed +18V, and
should be larger than –15V.
V2 (E8): 5V supply input; should not exceed +18V, and
should be larger than –15V.
ADJ (E3): Adjustable comparator non-inverting input for
setting switchover threshold level.
VCMP1_TOP (E2): Input for voltage monitored by first
auxiliary comparator CMP1.
VCMP2_TOP (E7): Input for voltage monitored by second
auxiliary comparator CMP2.
CMP1 (E4): Firstauxiliary comparator CMP1 non-inverting
input.
CMP2 (E6): Second auxiliary comparator CMP2 non-
inverting input.
GND (E5, E11, and E12): Common ground terminal.
OUT (E9): Output for up to 2A load.
LDO_EXT (E13): Positive terminal for external auxiliary
3.5V to 20V power supply.
V2P5V (E10): LDO output voltage terminal (2.5V).
JP1, LDO: ON/OFF switch for LDO.
JP2, LDO_POWER: Power supply selection for LDO.
D4: Indicates LDO output voltage.
D5: Indicates first auxiliary comparator output stage
(CMPOUT1 pin).
D6: Indicates second auxiliary comparator output stage
(CMPOUT2 pin).
D7: Indicates powering load from V2 source.

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dc2160af
DEMO MANUAL DC2160A
Refer to Figure 1for proper measurement equipment setup
and follow the procedure below:
1. Place JP1 in position ON and JP2 in position EXTER_
POWER. Turn off all external switches SW1-SW4.
Connect turrets ADJ and GND with external wire.
2. Adjust V1 supply output to 12.0V, V2 to 5V, and auxiliary
power supply to 10V. Use 30Ω resistive load.
3. Turn all external switches SW1-SW4 on.
4. Place scope probes at the ADJ and OUT turrets. Discon-
nect the turrets ADJ and GND and measure the time
between events when the ADJ pin voltage reaches
QUICK START PROCEDURE
1.097V and when the output voltage starts to rise. The
qualification time should be in the range 34ms to 94ms.
5. Turning SW1 off or decreasing V1 to 9V initiates swi-
tchover from V1 to V2. Turning SW1 back to on or
increasing V1 above 10.5V initiates switchover from
V2 to V1 with a qualification time delay.
6. Turnallexternalswitches SW1-SW4offagainandconnect
turrets ADJ and GND with external wire. Use 5Ω resistive
load. Place current probe to measure load current.
7. Turn all external switches SW1-SW4 on. Disconnect the
turretsADJand GND and observeovercurrent transients
with cooling period and thermal protection.
Figure 1. Proper Measurement Equipment Setup

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dc2160af
DEMO MANUAL DC2160A
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
1 0 BT1 HOLDER, BATTERY 20mm OPTION KEYSTONE 1066 OPTION
2 2 COUT1,COUT CAP, 1206 10μF 20% 25V TANT AVX F951E106MAAAQ2
3 3 C1, C2, C7 CAP, 2220 47uF 20% 25V X5R TDK CKG57NX5R1E476M500JH
4 0 C3, C4, C5, C6 CAP, 1206 OPTION OPTION
5 0 C8 CAP, 2220 OPTION OPTION
6 2 C9, C10 CAP, 0805 0.1μF 10% 25V X5R AVX 08053C104KAT2A
7 1 C11 CAP, 0805 10nF 10% 16V X7R AVX 0805YC103KAT2A
8 0 C13 CAP, 0805 1nF 10% 50V X7R OPTION AVX 08055C102KAT OPTION
9 1 C14 CAP, 7343 10μF 10% 35V TANT AVX TPSD106K035R0300
10 2 D1, D2 DIODE, 400 WATT TRANSIENT VOLTAGE
SUPPRESSOR
LITTELFUSE INC. SMAJ18CA
11 1 D3 DIODE, 400 WATT TRANSIENT VOLTAGE
SUPPRESSOR
LITTELFUSE INC. SMAJ18A
12 1 D4 LED, 0603 GREEN WURTH ELEKTRONIK 150060GS75000
13 1 D5 LED, 0603 BLUE WURTH ELEKTRONIK 150060BS75000
14 1 D6 LED, 0603 YELLOW WURTH ELEKTRONIK 150060YS75000
15 1 D7 LED, 0603 YELLOW ORANGE LITEON LTST-C190KFKT
16 6 E1, E8, E9, E11, E12, E13 TURRET MILL-MAX 2501-2-00-80-00-00-07-0
17 7 E2, E3, E4, E5, E6, E7, E10 TURRET MILL MAX 2308-2-00-80-00-00-07-0
18 2 JP1, JP2 HEADER, 2mm, 3-PIN WURTH 62000311121
19 4 MH1, MH2, MH3, MH4 STANDOFF, SNAP ON KEYSTONE_8831
20 1 R1 RES, 0805 1.21M PHMS 1% 1/18W VISHAY CRCW08051M21FKEA
21 2 R2, R7 RES, 0805 47.5k 5% 1/8W VISHAY CRCW080547K5FKEA
22 1 R3 RES, 0805 1M 1% 1/8W VISHAY CRCW08051M00FKEA
23 1 R4 RES, 0805 118k 1% 1/8W VISHAY CRCW0805118KFKEA
24 0 R5 RES, 0805 69.8k 1% 1/8W OPTION VISHAY CRCW080569K8FKEA OPTION
25 0 R6 RES, 0805 OPTION OPTION
26 1 R8 RES, 0805 365k 1% 1/8W VISHAY CRCW0805365KFKEA
27 2 R9, R10 RES, 0805 511k 1% 1/8W VISHAY CRCW0805511KFKEA
28 3 R11, R12, R13 RES, 0805 200Ω 1% 1/8W VISHAY CRCW0805200RFKEA
29 2 R15, R16 RES, 0805 2Ω 1% 1/8W VISHAY CRCW08052R00FKEA
30 0 R17, R19 RES, 0805 1M 1% 1/8W OPTION VISHAY CRCW08051M00FKEA OPTION
31 1 R18 RES, 0805 510Ω 5% 1/8W VISHAY CRCW0805510RJNEA
32 1 SW1 SWITCH, MOMENTARY, PUSH BUTTON WURTH 434 123 050 816
33 1 U1 IC, LTC4419IDD#TRPBF LINEAR TECH LTC4419IDD#TRPBF
34 1 U2 IC, 500mA LOW NOISE LDO
MICROPOWER REGULATOR
LINEAR TECH LT1763CS8-2.5#PBF
35 1 U3 IC, LOW-POWER TRIPLE INVERTER
BUFFER/DRIVER
TEXAS INSTRUMENTS
SN74AUP3G06DCUR
36 2 XJP1, XJP2 SHUNT, 2mm WURTH 60800213421

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dc2160af
DEMO MANUAL DC2160A
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
5
5
4
4
3
3
2
2
1
1
D D C C B B A A
OPT
ADDS HYSTERESIS
TO CMP1
VCMP1_TOP UVLO RANGE 10.30V-11.24V
NOTES: UNLESS OTHERWISE SPECIFIED,
1. ALL RESISITORS AND CAPACITORS ARE 0805.
+
-
2.5V UP
CMP1
HIGH
CMP2 OUT
FROM
V2
HIGH
OPT
ADDS HYSTERESIS
TO CMP2
OUT
OUT
V2P5V
V2P5V
V2P5V
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
4
Tuesday, May 05, 2015
11
2-INPUT PRIORITIZER
N/A
LTC4419IDD#TRPBF DEMO CIRCUIT 2160A
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
4
Tuesday, May 05, 2015
11
2-INPUT PRIORITIZER
N/A
LTC4419IDD#TRPBF DEMO CIRCUIT 2160A
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
4
Tuesday, May 05, 2015
11
2-INPUT PRIORITIZER
N/A
LTC4419IDD#TRPBF DEMO CIRCUIT 2160A
47uF C2 25V
2220
D7
YELLOW ORANGE
E10
V2P5V
R18 510
R7 47.5k 1%
47uF C7 2220
OPT C4 1206
R19
OPT
C11
10nF
U1
LTC4419IDD#TRPBF
V1
1
ADJ
3
V2ON 7
CMP2
9
CMPOUT2 6 CMPOUT1 5
OUT 8
4GND
CMP1
2
V2
10
11 GND
R12 200
D1
SMAJ18CA
R1 1.21M
D3
SMAJ18A
SMA
E4
CMP1
1nF C13
E2
VCMP1_TOP
E3
ADJ
OPT C3 1206
R4
118k
1%
SW1
PUSH FOR
FSEAL
R11 200
R6 OPT
R13 200
D2
SMAJ18CA
C9
0.1uF
D5
BLUE
R3
1M
1%
OPT C5 1206
E6
CMP2
BT1
3.6V
E12
GND
U3 SN74AUP3G06DCUR
1A
1
2A
3
3Y 2
GND
4
3A
6
2Y 5 1Y 7
VCC 8
E9
OUT
2A
V2ON
TP2
R8
365k
1%
R10
511k
1%
E5
GND
47uF C1 25V
2220
R9
511k
1%
U2 LT1763CS8-2.5#PBF
IN
8
SHDN
5BYP 4
SENSE/ADJ 2
OUT 1
GND
3
GND
6
GND
7
R16 2 1%
E1
V1
1.7V-18V
E8
V2
1.7V-18V
R5
OPT
R2 47.5k 1%
JP2
OUT
EXTER_POWER
LDO_POWER
1 3 2
OPT C6 1206
R17
OPT
JP1
ON OFF
LDO
1 3 2
+
COUT
10uF 1206
+
C14
10uF
35V
E13
LDO_EXTER
D6
YELLOW
D4 GREEN
R15 2 1%
E11
GND
CMPOUT2
TP4
+
COUT1
10uF 1206
CMPOUT1
TP3
E7
VCMP2_TOP
OPT C8 2220
C10 0.1uF

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dc2160af
DEMO MANUAL DC2160A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2016
LT0816 • 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 application
engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation

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