Linear Technology LTC4415EMSE Quick setup guide

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DEMO MANUAL DC1819A

PARAMETER CONDITIONS VALUE

Minimum Input Voltage VINx 1.7V

Maximum Input Voltage VINx 5.5V

Maximum Output Current CLIMx Resistor-Adjustable 4A

CLIMx Internal Limit 6A

CLIMx Clamp Voltage Current Limit 0.5V

Forward Voltage Drop VINx = 3.6V, IOUTx = 1A 50mV Typ

Reverse Turn-Off Voltage VINx – VOUTx –30mV

Enable Threshold EN1 and EN2 800mV

DESCRIPTION

LTC4415EMSE

Dual 4A Ideal Diodes with

Adjustable Current Limit

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, 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

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

(TA= 25°C)

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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 JP2 JP3

BOTH 4A 4A

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.

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, changethe CLIM1 andCLIM2 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.

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DEMO MANUAL DC1819A

QUICK START PROCEDURE

Figure 1. Proper Measurement Equipment Setup

–

LOAD1

–

LOAD2

–

VIN1

–

VIN2

–

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DEMO MANUAL DC1819A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 4 C1, C2, C3, C4 CAP, CHIP, X5R,10μF, ±10%, 16V, 0805 MURATA, GRM21BR61C106KE15L

2 1 R1 RES, CHIP, 100k, ±1%, 1/16W, 0402 VISHAY, CRCW0402100KFKED

3 1 R2 RES, CHIP, 2k, ±1%, 1/16W, 0402 VISHAY, CRCW04022K00FKED

4 1 R3 RES, CHIP, 21.5k, ±1%, 1/10W, 0402 VISHAY, CRCW040221K5FKED

5 2 R9, R10 RES, CHIP, 1k, ±1%, 1/16W, 0402 VISHAY, CRCW04021K00FKED

6 1 U1 IC, LTC4415EMSE LINEAR TECH., LTC4415EMSE#PBF

Additional Demo Board Circuit Components

1 4 C5, C6, C7, C8 CAP, CHIP, X5R,10μF, ±10%, 6.3V, 0603 TDK, C1608X5R0J106K

2 2 D1, D2 LED, SMT, GREEN, 0603 LITE-ON, LTST-C190KGKT

3 2 D3, D4 LED, SMT, YELLOW, 0603 LITE-ON, LTST-C190YKT

4 2 R4, R5 RES, CHIP, 10k, ±5%, 1/16W, 0402 VISHAY, CRCW040210K0JNED

5 2 R6, R13 RES, CHIP, 143Ω, ±1%, 1/16W, 0402 VISHAY, CRCW0402143RFKED

6 2 R8, R12 RES, CHIP, 332Ω, ±1%, 1/16W, 0402 VISHAY, CRCW0402332RFKED

7 4 R14, R15, R16, R17 RES, CHIP, 1k, ±5%, 1/16W, 0402 VISHAY, CRCW04021K00JNED

8 2 R7, R11 RES, CHIP, 1k, ±1%, 1/16W, 0402 VISHAY, CRCW04021K00FKED

9 4 R18, R19, R20, R21 RES, CHIP, 1Ω, ±5%, 1/16W, 0402 VISHAY, CRCW04021R00JNED

Hardware/Components (For Demo Board Only)

2 8 E1, E2, E5, E8, E14, E15, E16, E17 TEST POINT, TURRET, 0.094" MILL-MAX, 2501-2-00-80-00-00-07-0

1 9 E3, E4, E6, E7, E9, E10, E11, E12, E13 TEST POINT, TURRET, 0.061" MILL-MAX, 2308-2-00-80-00-00-07-0

3 1 JP1 3 Pin Jumper, 2mm SAMTEC, TMM-103-02-L-S

4 2 JP2, JP3 2 ×5 Pin Jumper, 2mm SAMTEC, TMM-105-02-L-D

5 3 JP1-3 SHUNT, 2mm SAMTEC, 2SN-KB-G

6 4 STAND-OFF, NYLON, 0.500" KEYSTONE, 8833

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DEMO MANUAL DC1819A

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

4 4

3 3

2 2

1 1

UNLESS NOTED:

RESISTORS: OHMS, 0402, 1%, 1/16W

CAPACITORS: uF, 0402, 10%, 50V

1.7V - 5.5V

BOTH ENABLE

CONTROL

PRIORITY

YLW

GRN YLW GRN

INTERNAL 6A

4A 4A

Iout (A) = 500/RCLPROG

0.5A

6A INTERNAL

0.5A

1.7V - 5.5V

CLIM1 CLIM2

JOSH Y.

PRODUCTION FAB2 08-19-11

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

DEMO CIRCUIT 1819A

DUAL 4A IDEAL DIODES WITH ADJUSTABLE CURRENT LIMIT

N/A LTC4415EMSE

JOSH Y.

08-19-11

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY

Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 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

VIN1

VIN2

VIN2VIN1

GND

R12

332

R19

R16

5 %

10μF

0805

16V

VIN1

VIN2

10μF

6.3V

0603

JP1

10k

EN1

R13

143

E14

WARN2

EN2

STAT2

STAT1

10μF

6.3V

0603 C4

10μF

16V

0805

LTC4415EMSE

IN1

EN1

OUT2

IN2

GND

OUT1

STAT1

IN1

CLIM1

IN2

CLIM2

EN2

OUT2

OUT1

WARN1

WARN2

STAT2

10k

CLIM2

E15

VOUT1

332

R20

10μF

16V

0805

100k

E13

STAT2

E16

GND

JP2

R15

5 %

R17

5 %

E12

WARN1

E17

VOUT2

10μF

6.3V

0603

E10

GND

CLIM1

E11

STAT1

E18

GND

143

21.5k

WARN1

R21

WARN2

10μF

6.3V

0603

GND

R10

JP3

R11

10μF

0805

16V

R14

5 %

R18

GND

dc1819afa

DEMO MANUAL DC1819A

LinearTechnology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900 ●FAX: (408) 434-0507 ●www.linear.com

LT 1011 REV A • 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

Mouser Electronics

Authorized Distributor

Click to View Pricing, Inventory, Delivery & Lifecycle Information:

Analog Devices Inc.:

DC1819A

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