Linear Technology LTC4231 Quick setup guide

dc2161af

DEMO MANUAL DC2161A

DESCRIPTION

LTC4231 Micropower

Hot Swap Controller

Demonstration circuit 2161A showcases the LT C

4231

Micropower Hot Swap

™

Controller in a 12V, 3A applica-

tion. Included on the board are input overvoltage and

reverse voltage protection, input voltage dividers for UV

and OV detection, an output voltage LED, jumpers to

disable UV/OV, manual and remote enable control, and

quiescentcurrentmeasurement.Thereareturretsprovided

to monitor input voltage, output voltage, output status,

quiescent current, several ground connections, timer pin,

and control the ON pin. Input, output and return voltages

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Hot

Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of

their respective owners.

are provided on banana jacks. The DC2161A-A version is

used to demonstrate the LTC4231-1 which remains off

after a current fault, while the DC2161A-B demonstrates

the LTC4231-2 which automatically reapplies power after

a cool-down period.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2161A

Table 1

PARAMETER CONDITIONS VALUE

Input Supply Voltage Range Limited by Transient Surge Protector –24V to +24V

Nominal Operating Voltage  12V

Overvoltage Lockout Nominal 14.4V

Undervoltage Lockout (Voltage Falling) Nominal 9.6V

Undervoltage Lockout (Voltage Rising) Nominal 10.8V

Output Current Limit  3A

Maximum Load Capacitance  600µF

Timer Expiration Period  2ms

Table 2. Power Input and Output Connections

NOMENCLATURE CONNECTOR DESCRIPTION

VIN 12V J1 12V Input

GND J2 12V Input Return

VOUT 12V, 3A J3 12V Output

GND J4 12V Output Return

Table 3. Test Points

NOMENCLATURE TURRET DESCRIPTION

VIN 12V E1 12V Input Monitor

GND E2, E4,

E6, E8

Ground

VOUT 12V, 3A E3 12V Output Monitor

STATUS E5 Status, Open Drain when Output

Enabled

GND E6 Ground

IQ E7 Quiescent Current Monitor. Use

Microammeter at This Point When JP2

Selects MEASURE IQ.

ON E9 Enable LTC4231 Output. Enables Output

or Selects External Control of Output

TIMER E10 TIMER Pin

PERFORMANCE SUMMARY

Specifications are at TA= 25°C

dc2161af

DEMO MANUAL DC2161A

DC2161A contains 3 jumpers. A description of each

jumper follows.

JP1, UV/OV.This jumper selects whether ornot undervolt-

ageor overvoltage lockout is enabled. When the jumper

is in the disable position, a UV or OV condition will not

block operation of the Hot Swap Controller. The default

is ENABLE.

JP2, IQ. The LTC4231 is a low power device, meaning it

draws very little current to perform its function. Any board

leakage on the GATE pin caused by board contamination or

adefectiveMOSFETwillcause this current to increase. JP2,

whenintheMEASUREIQposition,facilitatesmeasurement

of the quiescent current of the LTC4231 exclusive of the

current of other components on the board, such as LED

OPERATING PRINCIPLES

D2, output coupling capacitor C3, TVS diode D1, capacitor

C1, voltage divider R6, R7, R8 and R9, or any leakage on

the board. This current is measured via a microammeter

connected between turret E7 and GND. If the MEASURE IQ

position is selected, verify a microammeter is connected

to prevent damage to the board via leakage between VIN

and the gate of the MOSFETs. The default position for JP2

is NORMAL.

JP3, ENABLE. This jumper either enables or disables the

output or provides external control of the output. This is

provided by the ON pin of the LTC4231. When in the ON

position, the 12V VOUT is enabled. When in the OFF posi-

tion, the 12V VOUT is disabled. When in the EXT position,

the ON pin is connected via a 100kΩ resistor from turret

E9 to the ON pin of the LTC4231. A logic 1 on this pin will

enable the 12V VOUT. The default position for JP3 is ON.

The LTC4231 is a Micropower Hot Swap Controller that

has a 2.7V to 36V operating range and a –40V to 40V ab-

solute maximum voltage for the IN pin. This demo circuit

is populated for +12V operation, but it can easily be re-

adjusted for any voltage between 2.7V and 36V by replac-

ing R6, R7, R8, and R9 in the UVL, UVH, and OV divider

string. These values should be selected using guidelines

suggested in the LTC4231 data sheet to minimize current

drain. The DC2161A is populated with a Si7960DP dual

MOSFET with one section used as a pass MOSFET and the

other section used for reverse voltage protection. It also

has a 15mΩ sense resistor. This combination provides

an output current of 3A. Pads are provided on the PCB

for external MOSFET and sense resistor connections for

other voltages and currents.

JUMPERS

dc2161af

DEMO MANUAL DC2161A

DC2161A is easy to set up to evaluate the performance

of the LTC4231.

Connect a power supply capable of delivering greater than

3.5A of current between 10V and 20V to the VIN jack J1

with its return lead connected to GND J2. Monitor the input

voltage at turrets E1 and E2. Place a voltmeter between

turrets E3 and E4. Connect an ammeter between J3 and the

test loads. Connect the return lead of the test loads to jack

J4. The connections are shown schematically in Figure 1.

The active load should be set to provide a resistive load

since the LTC4231 may not start into a constant current

load. With the resistive load set at 5.4Ω, vary the input

voltage from 9V to 17V and from 17V to 9V to check the

UV and OV thresholds.

QUICK START PROCEDURE

Set the input voltage to 12V, vary the load resistance, and

observe output indicator D2. Determine from the ammeter

that the output remains on at 3A(4Ω). The output should

turn off at approximately 3.2A.

Reduce the load resistance to below 4Ω and observe an

auto reset in the DC2161A-B. In the DC2161A-A, power

will have to be removed and then applied to the input to

reset the LTC4231.

Remove the resistive load from the output and replace it

with a 500µF capacitor. Observe the polarity when con-

necting the capacitor. Upon application of input voltage,

LED D2 should illuminate to indicate VOUT is present. This

indicates the Hot Swap Controller is capable of starting

into a 500µF capacitor.

Figure 1. Proper Equipment Measurement Set-Up

TEST

LOADS

POWER

SUPPLY

dc2161af

DEMO MANUAL DC2161A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

1 1 C1 CAP., X7R, 0.1µF 25V, 10%, 0603 MURATA, GRM188R71E104KA01D

2 0 C2 CAP., 0402 OPT

3 1 C3 CAP., TANT, 100µF 25V, 20%, 7343 AVX, TAJE107M025RNJ

4 1 C4 CAP., X7R, 0.082µF 16V, 10%, 0402 MURATA, GRM155R71C823KA88D

5 1 D1 DIODE, SUPPRESSORS,600W, SMB-DIODE FAIRCHILD SEMI., SMBJ24CA

6 1 D2 LED, GREEN, LED-ROHM-SML-010 ROHM, SML-010FTT86

7 10 E1-E10 TURRET, TESTPOINT 0.064" MILL-MAX, 2308-2-00-80-00-00-07-0

8 2 JP1, JP2 HEADER, 2mm SINGLE 3POS SULLINS, NRPN031PAEN-RC

9 1 JP3 HEADER, 2mm DOUBLE 3POS SAMTEC, TMM-103-02-L-D

10 4 J1, J2, J3, J4 JACK, BANANA KEYSTONE, 575-4

11 1 Q1 MOSFET, DUAL-CH, 60V, SO8-POWERPAK VISHAY SILICONIX, Si7960DP-T1-GE3

12 1 R1 RES., CHIP, 10, 1/16W, 1%, 0603 VISHAY, CRCW060310R0FKEA

13 1 R2 RES., SENSE, 0.015, 1/4W, 1%, 1206 VISHAY, WSL1206R0150FEA

14 1 R3 RES., CHIP, 10, 1/16W, 1%, 0402 VISHAY, CRCW040210R0FKED

15 0 R4 RES., 0402 OPT

16 1 R5 RES., CHIP, 3.32kΩ, 1/16W, 1%, 0603 VISHAY, CRCW06033K32FKEA

17 1 R6 RES., CHIP, 1.24MΩ, 1/8W, 1%, 0805 VISHAY, CRCW08051M24FKEA

18 1 R7 RES., CHIP, 12.4kΩ, 1/16W, 1%, 0402 VISHAY, CRCW040212K4FKED

19 1 R8 RES., CHIP, 24.9kΩ, 1/16W, 1%, 0402 VISHAY, CRCW040224K9FKED

20 1 R9 RES., CHIP, 75kΩ, 1/16W, 1%, 0402 VISHAY, CRCW040275K0FKED

21 2 R10, R11 RES., CHIP, 100kΩ, 1/16W, 5%, 0402 VISHAY, CRCW0402100KJNED

22 3 SHUNTS AS

SHOWN ON ASSY

DWG

SHUNT, 2mm CTRS. SAMTEC, 2SN-BK-G

23 4 MH1-MH4 STAND-OFF, NYLON 0.25" KEYSTONE, 8831 (SNAP ON)

DC2161A-A Additional Demo Board Circuit Components

1 1 DC2161A-GENERAL BOM

2 1 U1 I.C., MICROPOWER HOT SWAP CONTROLLER, MS12 LINEAR TECH., LTC4231IMS-1

DC2161A-B Additional Demo Board Circuit Components

1 1 DC2161A-GENERAL BOM

2 1 U1 I.C., MICROPOWER HOT SWAP CONTROLLER, MS12 LINEAR TECH., LTC4231IMS-2

dc2161af

DEMO MANUAL DC2161A

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

D D

C C

B B

A A

NOTE: UNLESS OTHERWISE SPECIFIED

1. ALL CAPACITORS ARE IN MICROFARADS, 0402.

2. ALL RESISTORS ARE IN OHM, 0402.

ASSY

LTC4231-1

LTC4231-2

*SUFFIX

EXT

OFF

GATE

SOURCE

OUTSENSE

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

BOB S.PRODUCTION2 08-06-14

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

BOB S.PRODUCTION2 08-06-14

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

BOB S.PRODUCTION2 08-06-14

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

Wednesday, August 06, 2014

MICROPOWER HOT SWAP CONTROLLER

KIM T.

BOB S.

N/A

LTC4231IMS-1/ 2

DEMO CIRCUIT 2161A

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

Wednesday, August 06, 2014

MICROPOWER HOT SWAP CONTROLLER

KIM T.

BOB S.

N/A

LTC4231IMS-1/ 2

DEMO CIRCUIT 2161A

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

Wednesday, August 06, 2014

MICROPOWER HOT SWAP CONTROLLER

KIM T.

BOB S.

N/A

LTC4231IMS-1/ 2

DEMO CIRCUIT 2161A

8.45k

0.1uF

0603

0.1uF

0603

STATUS

LTC4231

GND

GNDSW

STATUS 9

SOURCE 11

SENSE 1

UVL

GATE 12

UVH

6TIMER 10

1.24M

0805

1.24M

0805

0.015

1206

1/4W

0.015

1206

1/4W

GND

E10

TIMER

E10

TIMER

OPT

GND

23.7k

JP1

UV/OV

ENABLE

DISABLE

HD1X3-079

JP1

UV/OV

ENABLE

DISABLE

HD1X3-079

12.1k

0603

12.1k

0603

66.5k

Q1A

Si7960DP

Q1A

Si7960DP

GND

E1E1

R10

100k

R10

100k

E2E2

VIN

12V

VIN

12V

Q1B

Si7960DP

Q1B

Si7960DP

JP2

NORMAL MEASURE IQ

JP2

NORMAL MEASURE IQ

SMBJ24CA

1 2

OPT

OPT D2

GREEN

2 1

0.082uF

GND

E4E4

R11

100k

R11

100k

0603

VOUT

12V, 3A

VOUT

12V, 3A

E3E3

JP3

HD2X3-079

ENABLE

JP3

HD2X3-079

ENABLE

5 6

100uF

25V

7343

100uF

25V

7343

dc2161af

DEMO MANUAL DC2161A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

 LINEAR TECHNOLOGY CORPORATION 2014

LT 1114 • 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

Mouser Electronics

Authorized Distributor

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

Analog Devices Inc.:

DC2161A-A DC2161A-B DC024A-C

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