DEMO MANUAL DC1819A
LTC4415EMSE
Dual 4A Ideal Diodes with
Adjustable Current Limit
DESCRIPTION
Demonstration circuit 1819A features the LTC
®
4415EMSE
dual ideal diodes. Each independent ideal diode can be
used to replace a standard diode for improved low forward
drop in applications requiring maximum headroom and
overall system efficiency.
The input supply voltage ranges are from 1.7V to 5.5V for
each input/output pair. As initially configured, LTC4415 can
provide a maximum current limit of 4A for each diode,
but is jumper-selectable up to 6A (internal current limit).
The voltage of the current limit pins, CLIM1 and CLIM2,
can also be monitored for a scaled representation of the
output current.
For evaluation, each diode can be controlled by the EN-
ABLE CONTROL jumper, JP1, or by the enable input pins,
EN1 and
EN2.
As initially configured, by setting to BOTH
the user can apply input voltages and loads on each diode
independently. Selecting PRIORITY allows the LTC4415 to
automatically switch over between inputs when the proper
input voltage threshold on IN1 is achieved.
Status and warning LEDs and test points are provided for
the logic output pins
STAT1, STAT2
and
WARN1, WARN2,
respectively.
Optionally, the LTC4415EDHC version can also be used
for evaluation. It is a pin-compatible drop-in replacement.
Design files for this circuit board are available at
http://www.linear.com/demo
L,
LT, LTC, LTM, μModule, 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
PARAMETER
Minimum Input Voltage
Maximum Input Voltage
Maximum Output Current
CLIMx Clamp Voltage
Forward Voltage Drop
Reverse Turn-Off Voltage
Enable Threshold
(T
A
= 25°C)
CONDITIONS
VINx
VINx
CLIMx Resistor-Adjustable
CLIMx Internal Limit
Current Limit
VINx = 3.6V, IOUTx = 1A
VINx – VOUTx
EN1 and
EN2
VALUE
1.7V
5.5V
4A
6A
0.5V
50mV Typ
–30mV
800mV
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DEMO MANUAL DC1819A
QUICK START PROCEDURE
Demonstration circuit 1819A is easy to set up to evaluate
the performance of the LTC4415. Refer to Figure 1 for
proper measurement equipment setup and follow the
procedure below.
1. Set the jumpers as below:
JP1
BOTH
JP2
4A
JP3
4A
Optional
1. For prioritization enable switchover set jumper JP1 to
PRIORITY.
2. For independent, external control of the enable pins,
remove the shunt on jumper JP1. Apply the logic control
signal on EN1 and
EN2
as necessary.
3. With all power off, change the CLIM1 and CLIM2 settings
on jumpers JP2 and JP3 for different current limits.
4. For load sharing or evaluation of the diode-OR func-
tion, connect the two diode outputs, OUT1 and OUT2,
together. The source of highest voltage will appear at
the output.
5. For independent path control from a common input,
connect the two diode inputs, IN1 and IN2, together.
2. With all power off, connect input 1 and 2 (VIN1 and
VIN2) power supplies capable of at least 4A each, the
loads (VOUT1 and VOUT2), and meters as shown in
Figure 1.
3. Preset the system loads to 0A and the input supplies
to 0V, 0A current limit.
4. Turn on the supplies, setting the current limit above 4A.
Adjust the voltages to the desired value, up to 5.5V.
5. Turn on the loads and adjust as necessary.
6. Monitor CLIM1 and CLIM2 pin voltages for a scaled
representation of the output currents.
7. Adjust the supply voltages further and observe how the
output states change accordingly.
STAT1
and
STAT2
will
change state if the input voltage drops below the UVLO
threshold.
8. Adjust the loads into current limit and observe how the
WARN1
and
WARN2
states change accordingly.
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DEMO MANUAL DC1819A
QUICK START PROCEDURE
+
+
VIN1
+
–
–
+
–
–
LOAD1
+
+
VIN2
+
–
–
+
–
–
LOAD2
Figure 1. Proper Measurement Equipment Setup
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DEMO MANUAL DC1819A
PARTS LIST
ITEM
1
2
3
4
5
6
1
2
3
4
5
6
7
8
9
2
1
3
4
5
6
QTY
4
1
1
1
2
1
4
2
2
2
2
2
4
2
4
8
9
1
2
3
4
REFERENCE
C1, C2, C3, C4
R1
R2
R3
R9, R10
U1
C5, C6, C7, C8
D1, D2
D3, D4
R4, R5
R6, R13
R8, R12
R14, R15, R16, R17
R7, R11
R18, R19, R20, R21
E1, E2, E5, E8, E14, E15, E16, E17
E3, E4, E6, E7, E9, E10, E11, E12, E13
JP1
JP2, JP3
JP1-3
PART DESCRIPTION
CAP CHIP X5R,10μF ±10%, 16V, 0805
,
,
,
RES, CHIP 100k, ±1%, 1/16W, 0402
,
RES, CHIP 2k, ±1%, 1/16W, 0402
,
RES, CHIP 21.5k, ±1%, 1/10W, 0402
,
RES, CHIP 1k, ±1%, 1/16W, 0402
,
IC, LTC4415EMSE
CAP CHIP X5R,10μF ±10%, 6.3V, 0603
,
,
,
LED, SMT, GREEN, 0603
LED, SMT, YELLOW, 0603
RES, CHIP 10k, ±5%, 1/16W, 0402
,
RES, CHIP 143Ω, ±1%, 1/16W, 0402
,
RES, CHIP 332Ω, ±1%, 1/16W, 0402
,
RES, CHIP 1k, ±5%, 1/16W, 0402
,
RES, CHIP 1k, ±1%, 1/16W, 0402
,
RES, CHIP 1Ω, ±5%, 1/16W, 0402
,
TEST POINT, TURRET, 0.094"
TEST POINT, TURRET, 0.061"
3 Pin Jumper, 2mm
2
×
5 Pin Jumper, 2mm
SHUNT, 2mm
STAND-OFF NYLON, 0.500"
,
MANUFACTURER/PART NUMBER
MURATA, GRM21BR61C106KE15L
VISHAY, CRCW0402100KFKED
VISHAY, CRCW04022K00FKED
VISHAY, CRCW040221K5FKED
VISHAY, CRCW04021K00FKED
LINEAR TECH., LTC4415EMSE#PBF
TDK, C1608X5R0J106K
LITE-ON, LTST-C190KGKT
LITE-ON, LTST-C190YKT
VISHAY, CRCW040210K0JNED
VISHAY, CRCW0402143RFKED
VISHAY, CRCW0402332RFKED
VISHAY, CRCW04021K00JNED
VISHAY, CRCW04021K00FKED
VISHAY, CRCW04021R00JNED
MILL-MAX, 2501-2-00-80-00-00-07-0
MILL-MAX, 2308-2-00-80-00-00-07-0
SAMTEC, TMM-103-02-L-S
SAMTEC, TMM-105-02-L-D
SAMTEC, 2SN-KB-G
KEYSTONE, 8833
Required Circuit Components
Additional Demo Board Circuit Components
Hardware/Components (For Demo Board Only)
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4
4
3
2
1
E1
2
JOSH Y.
VIN1
VIN2
PRODUCTION FAB
08-19-11
VIN1
REVISION HISTORY
ECO
REV
DESCRIPTION
APPROVED
DATE
VIN1
1.7V - 5.5V
C5
10μF
6.3V
0603
1
1
1
1
4
E2
GRN
2
2
2
YLW
2
GRN
YLW
GND
R18
1
5%
D1
STAT1
D2
WARN1
D3
STAT2
D4
WARN2
R1
100k
4
E3
R14
1K
5%
STAT1
WARN1
3
EN1
EN2
WARN2
16
15
12
STAT2
11
6
13
14
EN1
ENABLE
CONTROL
IN1
IN1
1
2
U1
LTC4415EMSE
R15
1K
5%
R16
1K
5%
R17
1K
5%
E11
E10
GND
JP1
BOTH
C1
10μF
0805
16V
PRIORITY
STAT1
E12
E13
E14
WARN1
STAT2
SCHEMATIC DIAGRAM
VIN2
E4
R2
2k
EN2
VIN2
OUT1
OUT1
1.7V - 5.5V
R3
21.5k
C4
10μF
16V
0805
E5
3
C6
10μF
6.3V
0603
7
8
IN2
IN2
E6
R19
1
5%
C8
10μF
6.3V
0603
WARN2
E15
VOUT1
1.7V - 5.5V
4A
3
GND
R21
1
5%
E16
GND
E17
E7
4
5
CLIM1
CLIM2
GND
17
OUT2
OUT2
10
9
CLIM1
CLIM1
JP2
6A INTERNAL
4A
2A
1A
0.5A
R4
10k
C2
10μF
16V
0805
CLIM2
CLIM2
JP3
E8
E9
R5
10k
GND
C3
10μF
16V
0805
C7
10μF
6.3V
0603
R20
1
5%
E18
VOUT2
1.7V - 5.5V
4A
INTERNAL 6A
4A
2A
1A
0.5A
GND
2
2
R6
143
R8
332
R7
1k
R9
1k
R11
1k
R10
1k
R12
332
R13
143
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.
Iout (A) = 500/RCLPROG
UNLESS NOTED:
RESISTORS: OHMS, 0402, 1%, 1/16W
CAPACITORS: uF, 0402, 10%, 50V
CUSTOMER NOTICE
APPROVALS
PCB DES.
APP ENG.
NC
JOSH Y.
1
TECHNOLOGY
TITLE: SCHEMATIC
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
1
DUAL 4A IDEAL DIODES WITH ADJUSTABLE CURRENT LIMIT
SIZE
IC NO.
REV.
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
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
3
2
N/A
SCALE = NONE
DATE:
08-19-11
LTC4415EMSE
DEMO CIRCUIT 1819A
SHEET 1
1
2
OF
1
4
DEMO MANUAL DC1819A
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Analog electronics
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