Linear Technology LTC4232 Quick setup guide

dc1886bfa

DEMO MANUAL DC1886B

DESCRIPTION

LTC4232 and LTC4232-1:

5A Integrated

Hot Swap Controller

Demonstration circuit 1886B features the LTC4232 and

the LTC4232-1 5A integrated Hot Swap™ controllers. The

LTC4232 is ideally suited for demanding power distribution

control in 2.9V to 15V applications for hot board inser-

tion protection, high side power switching, and electronic

circuit breaker functions. The LTC4232 provides a rich set

of features to support Hot Swap applications including:

• 2%accurateundervoltageandovervoltagecomparators

• Thermal protection

• Adjustable inrush current control

• Adjustable, 10% accurate current limit with program-

mable cutout time

• Foldback current limiting

• Programmable output voltage ramp rate

• Configurable auto-retry or latchoff on overcurrent faults

• Power good and fault outputs

• Debounce time during supply turn-on

PERFORMANCE SUMMARY

The LTC4232 debounce time is100ms,whiletheLTC4232-1

is 16ms. Both are available in a 16-lead 5mm × 3mm DFN

package. The LTC4232 is showcased on demonstration

circuit1886B-A.TheLTC4232-1 is installed onDC1886B-B.

Both demo boards are configured for 12V application. By

changing a few passive components, 2.9V to 15V applica-

tions can be easily evaluated.

The LTC4232 has limited output voltage slew rate with

a typical value of 300V/s, while the LTC4232-1 does not

have a special circuit to limit this parameter. The natural

(maximum) gate voltage slew rate (SN) of the LTC4232-1

is defined by the internal MOSFET CRSS (reverse transfer

capacitance) value and gate driver current capability. It is

48000V/s as a typical value.

Design files for this circuit board are available at

http://www.linear.com/demo/DC1886B

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.

(TA= 25°C)

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VDD Board Input Supply Range Min Is UV, Max Is OV 9.2 12 15.1 V

dVGATE/dt GATE Pin Turn-On Ramp Rate LTC4232

LTC4232-1 with 10nF GATE Capacitor

0.15

1.7

0.3

2.4

0.55

3.5

V/ms

RON MOSFET + Sense Resistor On-Resistance 15 33 50 mΩ

ILIM(TH) Current Limit Threshold VFB = 1.23V, No RSET

VFB = 0V

VFB = 1.23V, RSET = 20k

5.0

1.2

2.6

5.6

1.5

2.9

6.1

1.8

3.3

VTH OV, UV, FB Pin Threshold Voltage VIN Rising 1.21 1.235 1.26 V

VUV(RTH) UV Pin Reset Threshold Voltage VUV Falling 0.55 0.62 0.7 V

VFB(HYST) FB Pin Power Good Hysteresis 10 20 30 mV

tD(AUTO-RETRY) Auto-Retry Turn-On Delay (Internal) LTC4232

LTC4232-1

100

150

TADJUST Timer Period for ADJUSTABLE Option LTC4232

LTC4232-1

9.5

0.95

12.3

1.23

16.8

1.68

dc1886bfa

DEMO MANUAL DC1886B

JUMPERS AND LEDS

Figure 1. Proper Measurement Equipment Setup

Two demo board jumpers, JP1 and JP2, allow selection

of controller operation:

• JP1 TIMER DURATION: Set to FIXED 2ms position for

the internal 2ms timer period (FIXED 2ms not recom-

mended for LTC4232-1 during auto-retry) or ADJUST-

ABLE determined by TIMER capacitor C1 (12ms for

LTC4232 and 1.2ms for LTC4232-1). (Default position:

ADJUSTABLE)

• JP2 AUTORETRY: Set to ON for auto-retry or OFF for

latchoff on overcurrent fault. (Default position: OFF)

When selecting AUTORETRY option for the circuit with a

predominantly resistive load, particularly for LTC4232-1,

pay special attention to the power MOSFET thermal con-

dition. The initial low current limit (due to the foldback

characteristic) can power the load only during a very short

time, and the MOSFET will experience the maximum cur-

rent limit for almost all of the remaining power up period.

This may exceed the MOSFET SOA, if allowed to autoretry.

Four LEDs indicate the state of the hot swap circuit. Red

LEDs, D3 and D5, provide fault status and low output

voltage (it is a NOT power good signal). Two green LEDs,

D2 and D4, signal the presence of valid input and output

voltages.

dc1886bfa

DEMO MANUAL DC1886B

QUICK START PROCEDURE

Demonstration circuit 1886B is easy to set up to evaluate

the performance of the LTC4232 or LTC4232-1. Refer to

Figure 1 for the proper measurement equipment setup

and follow the procedure below.

1. Place jumpers in the following positions:

JP1 TIMER DURATION FIXED 2ms

JP2 AUTORETRY OFF

2. With power off, connect 12V power supply terminals

to the VDD (E1) and GND (E3) turrets.

3. Turn on the 12V power supply and verify the output

voltage between the VOUT (E2) and GND (E4) turrets.

Two green LEDs, D2 and D4 should light up.

4. Check the current limit using an electronic or resis-

tive load. It should be in the range of 5A to 6.1A if an

overcurrent condition occurs while the output is high

(after powering up properly). If the output is shorted

initially, the load current will be limited in the range of

1.2A to 1.8A due to the foldback characteristic. Current

may be monitored on the IMON turret. The IMON signal

scale is 0.4V/A.

An overcurrent condition is indicated by the red LED

FLT(D3) and red LED PG (D5).

5. Check the output voltage slew rate with an oscilloscope,

without a load connected. It should take from 22ms

to 80ms for LTC4232, and from 3.0ms to 7.0ms for

LTC4232-1.

6. For DC1886B-A (LTC4232) use a 2000μF capacitive

load to demonstrate that power up mode completes

successfully. Use a current probe to verify that inrush

current is limited initially by the foldback characteristic

and later by the low output voltage slew rate.

7. For DC1886B-A use a 6000μF capacitive load to dem-

onstrate that the part not only enters into the current

limit state but operates in this state until the timer period

expires. It is not a successful power up.

8. For DC18886B-B use a 800μF capacitive load to demon-

strate a successful power up mode. The controller will

operate in current limit almost all of the timer period.

9. For DC1886B-B use a 3000μF capacitive load to

demonstrate an unsuccessful power up transient. The

operating point does not leave current limit during the

whole timer period. It will then time out and turn off.

dc1886bfa

DEMO MANUAL DC1886B

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 0 CIN1, COUT2 CAP., SANYO\16X25\H OPT

2 1 COUT1 CAP., TANT, 22µF 25V, 20%, 7343 AVX, TPSD226M025R0200

3 1 C2 CAP., X5R, 1µF 25V, 0603 AVX, 06033D105KAT2A

4 1 D1 DIODE, 400W TRANSIENT VOLTAGE

SUPPRESSOR, SMA-DIODE

DIODES INC., SMAJ22A-13-F

5 2 D2, D4 LED, GREEN, LED-ROHM-SML-010FT ROHM, SML-010FTT86L

6 2 D3, D5 LED, RED, LED-ROHM-SML-010VT ROHM, SML-010VTT86L

7 4 E1, E2, E3, E4 TURRET, TEST PIN, 0.094" MILL-MAX, 2501-2-00-80-00-00-07-0

8 8 E5-E12 TURRET, TEST PIN, 0.064" MILL-MAX, 2308-2-00-80-00-00-07-0

9 2 JP1, JP2 JMP, HD1X3, 0.079CC SULLIN, NRPN031PAEN-RC

10 1 RMON RES., CHIP, 20k, 1/8W, 5%, 0805 YAGEO, RC0805JR-0720KL

11 0 RSET RES., CHIP, 0805 OPT

12 4 R1, R2, R3, R5 RES., CHIP, 3.3k, 1/16W, 5%, 0603 YAGEO, RC0603JR-073K3L

13 1 R4 RES., CHIP, 150k, 1/16W, 5%, 0603 YAGEO, RC0603JR-07150KL

14 3 R6, R7, R8 RES., CHIP, 20k, 1/16W, 5%, 0603 YAGEO, RC0603JR-0720KL

15 1 R9 RES., CHIP, 140k, 1/16W, 5%, 0603 YAGEO, RC0603JR-07140KL

16 1 R10 RES., CHIP, 226k, 1/16W, 5%, 0603 YAGEO, RC0603JR-07226KL

17 2 SHUNT, 0.079" CENTER SAMTEC, 2SN-BK-G

DC1886B-A Required Circuit Components

1 DC1886B-GENERAL BOM

1 C1 CAP., X5R, 1µF 25V, 0603 AVX, 06033D105KAT2A

0 CGS, CGATE CAP., 0603 OPT

0 RGATE RES., 0603 OPT

1 U1 I.C., LTC4232IDHC, DFN16DHC LINEAR TECH., LTC4232IDHC

DC1886B-B Required Circuit Components

1 DC1886B-GENERAL BOM

1 C1 CAP., X5R, 0.1µF 25V, 0603 AVX, 06033D104KAT2A

0 CGS CAP., X7R, 3300pF 100V, 5%, 0603 AVX, 06031C332JAT2A

1 CGATE CAP., X7R, 0.01µF 100V, 5%, 0603 AVX, 06031C103JAT2A

1 RGATE RES., CHIP, 100k, 1/10W, 1% 0603 NIC, NRC06F1003TRF

1 U1 I.C., LTC4232IDHC-1, DFN16DHC LINEAR TECH., LTC4232IDHC-1

dc1886bfa

DEMO MANUAL DC1886B

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

ALL CAPACITORS ARE IN MICROFARADS, 0603.

NOTES: UNLESS OTHERWISE SPECIFIED

2. INSTALL SHUNTS AS SHOWN.

1. ALL RESISTORS ARE IN OHMS, 0402.

FIXED ADJUSTABLE

TIMER

OFF ON

AUTORETRY

DURATION

CGATE

OPT

0.01uF

ASSY U1

*ALTC4232IDHC

LTC4232IDHC - 1B 100k

OPT

RGATESUFFIX

CGSC1

1uF

0.1uF

OPT

0.033uF

VOUT

VDD

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

LTC4232IDHC / -1

06/06/2014, 04:50 PM 1 1

5A INTEGRATED HOT SWAP CONTROLLER

KIM T.

VLADIMIR O.

N/A

DEMO CIRCUIT 1886B

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

LTC4232IDHC / -1

06/06/2014, 04:50 PM 1 1

5A INTEGRATED HOT SWAP CONTROLLER

KIM T.

VLADIMIR O.

N/A

DEMO CIRCUIT 1886B

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

LTC4232IDHC / -1

06/06/2014, 04:50 PM 1 1

5A INTEGRATED HOT SWAP CONTROLLER

KIM T.

VLADIMIR O.

N/A

DEMO CIRCUIT 1886B

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

VLADIMIR O.

REBUILD WITH CHANGE2 06-06-14

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

VLADIMIR O.

REBUILD WITH CHANGE2 06-06-14

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

VLADIMIR O.

REBUILD WITH CHANGE2 06-06-14

RSET

OPT

0805

RSET

OPT

0805

R10

226k

R10

226k

3.3k

E10

ISET

E10

ISET

GND

GND R3

3.3k

RED

2 1

150k

COUT2

OPT

COUT2

OPT

1uF

25V

1uF

25V

JP1JP1

CGATE

20k

U1 *

FLT

IMON 14

VDD

TIMER

INTVCC

ISET 15

PG 11

GATE 10

FB 13

OUT 9

GND

VDD

16 OUT 8

OUT 7

SENSE

JP2JP2

20k

FLT

RMON

20k

0805

RMON

20k

0805

3.3k

CIN1

OPT

CIN1

OPT

GREEN

2 1

E12

INTVCC

E12

INTVCC

RED

2 1

SMAJ22A

2 1

3.3k

VDD

12V

VDD

12V

E11

IMON

E11

IMON

20k

140k

GREEN

2 1

RGATE

TIMER

OV E6

GND

E2 VOUT

12V / 5A

E2 VOUT

12V / 5A

COUT1

22uF

25V

7343

COUT1

22uF

25V

7343

CGS

dc1886bfa

DEMO MANUAL DC1886B

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

 LINEAR TECHNOLOGY CORPORATION 2012

LT 0814 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

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