Linear Technology LTC2950-2 User manual

dc826cf

DEMO MANUAL

DC826C-A/DC826C-B

DESCRIPTION

LTC2950-2/LTC2951-2

Pushbutton On/Off Controller

Demonstration circuits 826C-A and 826C-B feature the

LT C

2950-2 and the LTC2951-2 respectively, which are

low power, wide input voltage range, pushbutton on/off

controllers. A pushbutton switch shorts the PB pin to

ground which in turn sets the EN pin low (see Note1).

Shorting PB to ground a second time subsequently resets

the EN pin high. The EN pin is used to connect to a DC/

DC converter shutdown to control the turn on and off of

the circuit, simulated with a green LED on the DC826C-A/

DC826C-B.

JP1 and JP2 on the DC826C-A provide the selection

of timing options for the PB on and off times. For the

DC826C-B, JP1 selects KILL times while JP2 selects off

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

Technology Corporation. All other trademarks are the property of their respective owners.

IC SELECTION GUIDE

times. JP3 ties and unties KILL to INT for immediate or

delayed turn off. The INT status is shown with a red LED.

DC826C-A/DC826C-B accepts an input voltage range of

2.7V to 26.4V or a 9V battery for portable demonstration

and evaluation.

Note 1: The inversion of EN of the LTC2950-2/LTC2951-2

is found in the LTC2950-1/LTC2951-1. Table 1 provides

an IC selection guide.

Design files for this circuit board are available at

http://www.linear.com/demo/DC826C

Table 1. LTC2950/LTC2951 Selection Guide (Typical Timing Values, Cap. Adjust = 212ms on DC826C-A/DC826C-B)

PART ENABLE ONT OFFT KILLT DEMO BOARD

LTC2950-1 EN 32ms + Cap. Adjust* 32ms + Cap. Adjust* 1000ms N/A

LTC2950-2 EN 32ms + Cap. Adjust* 32ms + Cap. Adjust* 1000ms DC826C-A

LTC2951-1 EN 128ms 32ms + Cap. Adjust* 128ms + Cap. Adjust* N/A

LTC2951-2 EN 128ms 32ms + Cap. Adjust* 128ms + Cap. Adjust* DC826C-B

*The additional Cap. Adjust time is selected by an external capacitor. The DC826C-A and DC826C-B adjust times have been pre-selected with a 0.033μF

capacitor to provide an additional 212ms. The additional time is calculated with the following equations as shown in the LTC2950/LTC2951 data sheets:

CONT = 1.56e-4 [μF/ms] • (tONT – 1ms)

COFFT = 1.56e-4 [μF/ms] • (tOFFT – 1ms)

CKILLT = 1.56e-4 [μF/ms] • (tKILL, OFF DELAY, ADDITIONAL – 1ms)

dc826cf

DEMO MANUAL

DC826C-A/DC826C-B

QUICK START PROCEDURE

Demonstration circuit 826C-A/826C-B is easy to set up to

evaluate the performance of the LTC2950-2/LTC2951-2:

1. Place jumpers in the following positions:

JP1: 0.033μF

JP2: 0.033μF

JP3: UNTIE

The duration that PB must be shorted to ground in order

to turn on/off the DC/DC converter is independently pro-

grammed (LTC2950-2) by two external capacitors C1 and

C2 and selected on the DC826C-A with jumper JP1 and

JP2. The status of the EN pin, and simulation of the turn

on/off of a DC/DC converter, is displayed with green LED

D2 on the board.

Figure 1 shows how the EN is connected to the SHDN pin

of a DC/DC converter and how INT and KILL interfaces with

aµP or µC. An internal 500ms timer blanks (ignores) the

KILL signal during system power up. This allows sufficient

time for the DC/DC converter and a µP to perform power

up tasks. During turn off, a power down timer provides

a delay (LTC2950-2: 1000ms, LTC2951-2: adjustable)

from interrupting the µP(INT = low) to turning off the DC/

DC converter (EN = high). This delay gives the µP time

to perform power down and housekeeping tasks. On the

DC826C-B, JP1 selects the power down timer, while JP2

is used to adjust the turn off PB duration. The red LED

D1 shows the state of the INT pin. A µP can turn off the

converter with no delay by asserting KILL low. By tying

KILL to INT through JP3, KILL is forced low during the

INT blanking time and thus forces a turn off.

The RC (RRPP and CRPP) at VIN on the DC826 provides

reversepolarityprotectiontotheLTC2950-2/LTC2951-2.If

power is connected in an application such that the polari-

ties are ensured to be in the correct configuration, this RC

may be removed from the circuit.

An additional RC (RF and CF), located at the PB pin, acts

as a filter and is used in an application where the switch

is located far from the LTC2950-2/LTC2951-2. In such a

case, the RC would be placed next to the switch rather

than the part. If the switch is located near the LTC2950-2/

LTC2951-2, then the RC may be removed from the circuit.

An LDO (U2) is used on the DC826 to provide a pull-up

voltage of 2.6V which is well below the absolute maximum

on the INT, EN, and KILL pins for the full range of input

voltage of 2.7V to 26.4V. In an application, pull these

pins up to a voltage no higher than their rated absolute

maximum shown in the data sheet. Optional Zener diodes

(D3 – D5) can be used if the pull-up voltage exceeds the

rated absolute maximum. (If the interface pins on the

DC826C-A /DC826C-B will be pulled up to an external

supply, LEDs D1 and D2 should be removed.)

2. Connect the input power supply of 2.7V to 26.4V across

VIN and GND or a 9V battery to the battery connector.

3. Push and hold the pushbutton once to turn on the green

LED.

4. Push and hold the pushbutton again to turn off the

green LED.

OPERATING PRINCIPLES

dc826cf

DEMO MANUAL

DC826C-A/DC826C-B

Figure1. DC826C-A/DC826C-B Example Setup

PUSHBUTTON

VIN

SHDN

VIN

VOUT

INT

KILL

DC/DC

BUCK

µP/µC

2.7V TO 26.4

9V BATTERY

10k

DC826C F01

OPERATING PRINCIPLES

dc826cf

DEMO MANUAL

DC826C-A/DC826C-B

SCHEMATIC DIAGRAM

4 4

3 3

2 2

1 1

SEE NOTE #1

NOTE 1. EN, the inverse of EN,

is available in the LTC2950-1/LTC2951-1.

VIN

2.6V

VIN 2.6V

SIZE

MODIFY DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY





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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



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







Dilian Reyes

C:\PADS PROJECTS\826C-A\SCH\826C-A_REV1.DSN

SIZE

MODIFY DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY



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

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













Dilian Reyes

C:\PADS PROJECTS\826C-A\SCH\826C-A_REV1.DSN

SIZE

MODIFY DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY





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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













Dilian Reyes

C:\PADS PROJECTS\826C-A\SCH\826C-A_REV1.DSN

REVISION HISTORY

DESCRIPTION DATE

APPROVED

ECO REV

Dilian ReyesPRODUCTION(Replaced S1, D1 & D2)



Jan 27, 2014

REVISION HISTORY

DESCRIPTION DATE

APPROVED

ECO REV

Dilian ReyesPRODUCTION(Replaced S1, D1 & D2)



Jan 27, 2014

REVISION HISTORY

DESCRIPTION DATE

APPROVED

ECO REV

Dilian ReyesPRODUCTION(Replaced S1, D1 & D2)



Jan 27, 2014

TP5

KILL

TP5

KILL

ON/OFF

11V

(Opt)

11V

(Opt) TP6

GND

TP6

GND

0.033uF

113k

0.47uF

10V

0.47uF

10V

TP7

GND

TP7

GND

JP2

0.033uF

OPEN

OFFT

JP2

0.033uF

OPEN

OFFT

RRPP

RED

INT

RED

INT

RED

BLK

KEYSTONE

#232

RED

BLK

KEYSTONE

#232

100k

JP1

0.033uF

OPEN

ONT/KILLT

JP1

0.033uF

OPEN

ONT/KILLT

100

TP1

VIN

2.7V-26.4V

TP1

VIN

2.7V-26.4V

11V

(Opt)

11V

(Opt)

11V

(Opt)

11V

(Opt)

CRPP

0.1uF

50V

CRPP

0.1uF

50V

TP4

TP2

INT

TP2

INT

TP3

LT3014BES5

GND

1OUT 5

ADJ 4

100k

JP3

TIE

UNTIE

INT/KILL

JP3

TIE

UNTIE

INT/KILL

GRN

100

LTC2950CTS8-2

GND

INT 5

KILL 8

ONT/KILLT

EN 6

VIN

OFFT

5.1k

0.033uF

0.1uF

50V

0.1uF

50V

dc826cf

DEMO MANUAL

DC826C-A/DC826C-B

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

SEE NOTE #1

NOTE 1. EN, the inverse of EN,

is available in the LTC2950-1/LTC2951-1.

VIN

2.6V

VIN 2.6V

SIZE

MODIFY DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY





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



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













Dilian Reyes

C:\PADS PROJECTS\826C-B\SCH\826C-B_REV1.DSN

SIZE

MODIFY DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY





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

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













Dilian Reyes

C:\PADS PROJECTS\826C-B\SCH\826C-B_REV1.DSN

SIZE

MODIFY DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY











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













Dilian Reyes

C:\PADS PROJECTS\826C-B\SCH\826C-B_REV1.DSN

REVISION HISTORY

DESCRIPTION DATE

APPROVED

ECO REV

Dilian ReyesPRODUCTION(Replaced S1, D1 & D2)



Jan 27, 2014

REVISION HISTORY

DESCRIPTION DATE

APPROVED

ECO REV

Dilian ReyesPRODUCTION(Replaced S1, D1 & D2)



Jan 27, 2014

REVISION HISTORY

DESCRIPTION DATE

APPROVED

ECO REV

Dilian ReyesPRODUCTION(Replaced S1, D1 & D2)



Jan 27, 2014

TP5

KILL

TP5

KILL

ON/OFF

11V

(Opt)

11V

(Opt) TP6

GND

TP6

GND

0.033uF

113k

0.47uF

10V

0.47uF

10V

TP7

GND

TP7

GND

JP2

0.033uF

OPEN

OFFT

JP2

0.033uF

OPEN

OFFT

RRPP

RED

INT

RED

INT

RED

BLK

KEYSTONE

#232

RED

BLK

KEYSTONE

#232

100k

JP1

0.033uF

OPEN

ONT/KILLT

JP1

0.033uF

OPEN

ONT/KILLT

100

TP1

VIN

2.7V-26.4V

TP1

VIN

2.7V-26.4V

11V

(Opt)

11V

(Opt)

11V

(Opt)

11V

(Opt)

CRPP

0.1uF

50V

CRPP

0.1uF

50V

TP4

TP2

INT

TP2

INT

TP3

LT3014BES5

GND

1OUT 5

ADJ 4

100k

JP3

TIE

UNTIE

INT/KILL

JP3

TIE

UNTIE

INT/KILL

GRN

100

LTC2951CTS8-2

GND

INT 5

KILL 8

ONT/KILLT

EN 6

VIN

OFFT

5.1k

0.033uF

0.1uF

50V

0.1uF

50V

dc826cf

DEMO MANUAL

DC826C-A/DC826C-B

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

 LINEAR TECHNOLOGY CORPORATION 2015

LT 0815 • 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

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