Linear Technology DC2235A Quick setup guide

dc2235af

DEMO MANUAL DC2235A

DESCRIPTION

LTC3265EDHC

Low Noise Dual Supply with Boost

and Inverting Charge Pumps

Demonstration Circuit 2235A has boost and inverting

charge pumps each with a low noise LDO post regulator

featuring the LT C

3265EDHC. The LTC3265 operates with

an input voltage from 4.5V to 16V for the boost charge

pump and from 4.5V to 32V for the inverting charge pump.

ThedemoboardprovidesselectableLDO±outputsetmag-

nitudes of 5V, 15V, and 24V for each polarity. The demo

boardalsoprovidesthemeanstoselect between low power

Burst Mode

operation or low noise constant-frequency L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks

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

owners.

PERFORMANCE SUMMARY

BOARD PHOTO

mode operation, plus select an operating frequency of

500kHz, 200kHz, or 50kHz.

The LTC3265 data sheet gives a complete description of

thedevice,operation and application information. The data

sheet must be read in conjunction with this demo manual.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2235A

Specifications are at TA= 25°C

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VIN_P VIN_P Input Voltage Range 4.5 16 V

VIN_N VIN_N Input Voltage Range 4.5 32 V

VLDO+LDO+Output Voltage VIN_P • 2 ≥ LDO+Set Point + 0.8V 1.2 32 V

VLDO–LDO–Output Voltage VIN_N ≤ LDO–Set Point – 0.5V –32 –1.2 V

VOUT+VOUT+Output Voltage Range MODE = 0V (Const. Freq.)

MODE ≥ 2V (Burst)

VIN_P • 2

0.94 • VIN_P • 2

VOUT–VOUT–Output Voltage Range MODE = 0V (Const. Freq.)

MODE ≥ 2V (Burst)

–VIN_N

–0.94 • VIN_N

dc2235af

DEMO MANUAL DC2235A

TYPICAL APPLICATIONS

QUICK START PROCEDURE

Low Noise ±15V Outputs from a Single 12V Input LDO Rejection of VOUT ±Ripple

VOUT+

10mV/DIV

AC-COUPLED

VLDO+

10mV/DIV

AC-COUPLED

VLDO–

10mV/DIV

AC-COUPLED

VOUT–

10mV/DIV

AC-COUPLED

1µs/DIV DC2235A TA01b

VIN_P = 12V, VIN_N = VOUT+

VLDO+= 15V

VLDO–= –15V

fOSC = 500kHz

ILDO+= 20mA

ILDO– = –20mA

VIN_N

CBST+CBST–

LTC3265

1µF

VOUT+

VIN_P

10µF

+15V

12V

–15V

DC2235A TA01a

604K

52.3k

604K

100nF

10µF

1µF

10µF

LDO+

EN+ADJ+

EN–BYP+

MODE GND

CINV+BYP–

CINV–ADJ–

VOUT–LDO–

Refer to Figure 1 for the proper measurement equipment

setupandjumper settings and follow the procedurebelow.

NOTE: When measuring the input or output voltage ripple,

care must be taken to avoid a long ground lead on the

oscilloscope probe. Measure the input or output voltage

ripple by touching the probe tip directly across the VIN or

VOUT and GND terminals. See Figure 2 for proper scope

probe technique.

1. Make sure the jumper settings are as follows:

JP1: EN+is on the ON position

JP2: EN–is on the ON position

JP3: MODE is in the Burst position

JP4: FREQ is on the 500kHz position

JP5: LDO+is set to 15V setting

JP6: LDO–is set to –15V setting

2. Set SW1 to the VOUT+position.

3. Set PS1 to 12V.

4. Slowly increase load on LDO–to –50mA and observe

how output ripple on VOUT–changes and how burst

frequency increases. When the load is large enough,

the charge pump will run constant-frequency.

5. SlowlyincreasetheloadonLDO+to50mA and observe

the output ripple and the output voltage on LDO+.

6. Set the LDO+load and the LDO–load to 0mA and turn

off PS1.

7. Set SW1 to the VIN_P position.

8. Set JP5 LDO+jumper to 5V position and JP6 LDO–to

the –5V position.

Note: It is recommended to remove power or disable

the respective regulators prior to changing the posi-

tions of the LDO±output jumpers (JP5, JP6).

9. Repeat steps 3 through 6.

10. Set JP5 LDO+jumper to 24V position and JP6 LDO–to

the –24V position.

11. Set SW1 to the VOUT+ position

12. Turn on and set PS1 to 15V.

13. Repeat steps 4 through 6.

14. Return JP5 LDO+jumper to 15V position and JP5

LDO–to the –15V position.

15. Turn on and set PS1 to 12V.

dc2235af

DEMO MANUAL DC2235A

Figure 1. Proper Measurement Equipment Setup for DC2235A

16. Slowly increase the load on VOUT+to 100mA and ob-

serve the output ripple and output voltage on VOUT+.

17. Set the load on VOUT+to 0mA.

18. Slowly increase the load on VOUT–to –100mA and

observe the output ripple and output voltage on VOUT–.

19. Set the load on VOUT–to 0mA.

20. Change JP3 MODE jumper from Burst Mode operation to

the constant-frequency mode and repeat steps 16 to 19.

21. Change JP4 FREQ jumper from 500kHz to 200kHz then

slowly increase the load on VOUT+from 0mA to 50mA and

observe the output ripple and output voltage on VOUT+.

22. Set the load on VOUT+to 0mA.

23. Slowly increase the load on VOUT–to –50mA and ob-

serve the output ripple and output voltage on VOUT–.

24. Set the load on VOUT–to 0mA.

25. Change JP4 FREQ jumper from 200kHz to 50kHz. Slowly

increasetheloadonVOUT+from0mAto10mAandobserve

the output ripple and output voltage on VOUT+.

26. Set the load on VOUT+to 0mA.

27. Slowly increase the load on VOUT–to -10mA and ob-

serve the output ripple and output voltage on VOUT–.

28. Set the load on VOUT–to 0mA.

29. Turn off the loads and supply when done.

QUICK START PROCEDURE

dc2235af

DEMO MANUAL DC2235A

Figure 2. Measuring Input or Output Ripple

APPLICATIONS INFORMATION

QUICK START PROCEDURE

LOAD CURRENT (mA)

0.1

100

0.5

1.0

1.5

2.0

2.5

3.0

(2 • VIN_P–VOUT+) VOLTAGE (V)

DC2235A F03

RT= GND

RT= 1.2MΩ

RT= 200kΩ

VIN_P = 10V

LOAD CURRENT (mA)

0.1

100

0.5

1.0

1.5

2.0

2.5

3.0

(VIN_N–|VOUT–|) VOLTAGE (V)

DC2235A F04

RT= GND

RT= 1.2MΩ

RT= 200kΩ

VIN_P = VIN_N = 10V

Figure 3. VOUT+Voltage Loss vs Output Current

(Constant-Frequency Mode)

Figure 3 illustrates the voltage loss from the ideal boost

charge pump output voltage of 2 • VIN_P to the measured

VOUT+voltage. Figure 4 illustrates the voltage loss from

Figure 4. VOUT–Voltage Loss vs Output Current

(Constant-Frequency Mode)

the ideal inverting charge pump output voltage of –VIN_N

to the measured VOUT–voltage.

dc2235af

DEMO MANUAL DC2235A

APPLICATIONS INFORMATION

Figure 5. CISPR22 Radiated Emissions Figure 6. CISPR25 Conducted Emissions

FREQUENCY (MHz)

100

200

300

400

500

600

700

800

900

1000

–10

dBμV/m

dc2235 F05

= 12V, V

OUT

= ±15V, 600Ω LOAD RESISTOR

WITHOUT C1 INSTALLED

= 12V, V

OUT

= ±15V, 600Ω LOAD RESISTOR

WITH C1 = 10μF

CISPR22 LIMIT LINE

FREQUENCY (Hz)

100k

10M

100M

100

110

AMPLITUDE (dBμV)

dc2235a F06

= 12V, V

OUT

= ±15V, LOAD = 600Ω

WITHOUT C1 INSTALLED

= 12V, V

OUT

= ±15V, LOAD = 600Ω

WITH C1 = 10μF

CISPR25 LIMITS FOR BROADBAND

CONDUCTED DISTURBANCES ON POWER

INPUT TERMINALS PEAK LIMIT (CLASS 3)

Figures 5 and 6 are CISPR radiated and conducted

emissions respectively. The data were collected in a

GTEM chamber and using a CISPR25 LISN for conducted

emissions. The EMI tests were conducted using a 12V

input on VIN_P, VOUT+connected to VIN_N via SW1 of the

demo board, and a 600Ω resistor load between LDO+and

LDO–inconstant-frequencymodewith a 500kHz oscillator

frequency. Linear Technology has made every effort to

provide useful and accurate EMI data, but it remains the

responsibility of the customer to ensure product compli-

ance with applicable rules and regulations.

dc2235af

DEMO MANUAL DC2235A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C2 CAP, CHIP, X7R,10µF, ±10%, 25V, 1206 WURTH ELEKTRONIK, 885012208069

2 5 C3, C6, C10, C12, C14 CAP, CHIP, X7S, 10µF, ±10%, 50V, 1210 TDK, C3225X7S1H106K250AB

3 1 C4 CAP, CHIP, X7R, 1µF, ±10%, 25V, 0805 TDK, C2012X7R1E105K125AB

4 1 C13 CAP, CHIP, X7R, 1µF, ±10%, 50V, 1206 TDK, C3216X7R1H105K160AB

5 2 R3, R9 RES 604kΩ 1/16W 1% 0402 SMD VISHAY, CRCW0402604KFKED

6 2 R11, R12 RES 52.3kΩ 1/16W 1% 0402 SMD VISHAY, CRCW040252K3FKED

7 1 U1 LOW NOISE DUAL SUPPLY WITH BOOST AND

INVERTING CHARGE PUMPS

LINEAR TECH., LTC3265EDHC#PBF

Additional Demo Board Circuit Components

8 1 C1 CAP, CHIP, X7R,10µF, ±10%, 25V, 1206 WURTH, 885012208069

9 0 C5, C7, C9 (OPT) CAP, CHIP, 25V, 0603

10 2 C8, C11 CAP, CHIP, X7R, .1µF, ±10%, 16V, 0402 MURATA, GRM155R71C104KA88D

11 2 C15, C16 CAP, CHIP, NPO, 10pF, ±5%, 50V, 0402 AVX, 04025A100JAT2A

12 3 R1, R6, R13 RES 1.0MΩ 1/16W 5% 0402 SMD VISHAY, CRCW04021M00JNED

13 2 R2, R8 RES 1.0MΩ 1/16W 1% 0402 SMD VISHAY, CRCW04021M00FKED

14 2 R4, R10 RES 165kΩ 1/16W 1% 0402 SMD VISHAY, CRCW0402165KFKED

15 3 R5, R7, R14 RES 4.7kΩ 1/16W 5% 0402 SMD VISHAY, CRCW04024K70JNED

16 1 R15 RES 909kΩ 1/16W 1% 0402 SMD VISHAY, CRCW0402909KFKED

17 1 R16 RES 200kΩ 1/16W 1% 0402 SMD VISHAY, CRCW0402200KFKED

Hardware

18 3 JP1, JP2, JP3 HEADER, 3-PIN 1 ROW 0.079CC SULLIN, NRPN031PAEN-RC

19 1 JP4 HEADER, 4-PIN 1 ROW 0.079CC SULLIN, NRPN041PAEN-RC

20 2 JP5, JP6 HEADER, 2 × 3 PINS, 2mm SULLIN, NRPN032PAEN-RC

21 6 JP1-JP6 SHUNT, 2mm SAMTEC, 2SN-BK-G

22 10 E1, E2, E7-E14 TP, TURRET, 0.094", PBF MILL-MAX, 2501-2-00-80-00-00-07-0

23 4 E3-E6 TURRET, 0.061" DIA MILL-MAX, 2308-2-00-80-00-00-07-0

24 4 MH1-MH4 STAND-OFF, NYLON 0.375" TALL KEYSTONE, 8832 (SNAP ON)

25 1 SW1 10mm × 2.5mm, SLIDE SWITCH, THT WURTH ELEKTRONIK, 450301014042

dc2235af

DEMO MANUAL DC2235A

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

ALL CAPACITORS ARE 0402, 10%

1. ALL RESISTORS ARE 0402, 1%, 1/16W

4.5V - 16V

2. INSTALL SHUNTS AS SHOWN.

NOTE: UNLESS OTHERWISE SPECIFIED

( 2 · VIN_P ) *

24V

15V

50mA

-24V

50mA

-5V

-15V

FREQ

( - VIN_N ) *

WURTH

* SEE DEMO MANUAL FOR VOUT ± CURRENT CAPABILITY

WARNING: IF LDO± OUTPUT JUMPER (JP5, JP6) IS REMOVED

WHILE CONVERTER IS ENABLED, THE LDO OUPUT WILL

INCREASE TO THE RESPECTIVE VOUT INPUT.

VIN_N

VOUT+

VIN_P

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

M. MERCHANTPRODUCTION FAB3 05 - 28 - 15

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

M. MERCHANTPRODUCTION FAB3 05 - 28 - 15

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

M. MERCHANTPRODUCTION FAB3 05 - 28 - 15

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

DEMO CIRCUIT 2235A

LOW NOISE DUAL SUPPLY WITH

N/A LTC3265EDHC

MARTY M.

05 - 28 - 15

BOOST AND INVERTING CHARGE PUMPS

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

DEMO CIRCUIT 2235A

LOW NOISE DUAL SUPPLY WITH

N/A LTC3265EDHC

MARTY M.

05 - 28 - 15

BOOST AND INVERTING CHARGE PUMPS

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

DEMO CIRCUIT 2235A

LOW NOISE DUAL SUPPLY WITH

N/A LTC3265EDHC

MARTY M.

05 - 28 - 15

BOOST AND INVERTING CHARGE PUMPS

R13

1.0M

LDO +

C10

10uF

50V

1210

R16

200k

1uF

25V

0805

C12

10uF

50V

1210

GND

R14

4.7k

R10

165k

4.7k

10uF

25V

1206

(1210)

SW1

450301014042

VIN_P

1.0M

VOUT+

E13

VOUT-

10uF

50V

1210

1.0M

JP5

LDO+

JP4

FREQ

50kHz

200kHz

500kHz

C11

0.1uF

16V

10uF

50V

1210

MODE

OPT

25V

0603

E10

GND

C13

1uF

50V

1206

EN -

R12

52.3k

JP3

MODE

CONST

BURST

1.0M

4.7k

LTC3265

BYP- 5

ADJ- 6

LDO - 7

VOUT+ 18

LDO + 17

EN-

MODE

ADJ+ 16

BYP+ 15

GND

VOUT- 8

CINV-

CINV+

VIN_N

EN+

VIN_P

CBST+

CBST-

OPT

25V

0603

JP1

EN+

OFF

E11

LDO -

C16

10pF

50V

604k

JP6

LDO-

OPT

25V

0603

0.1uF

16V

C14

10uF

50V

1210

E14

GND

R15

909k

C15

10pF

50V

EN+

R11

52.3k

GND

E12

GND

604k

JP2

EN -

OFF

165k

10uF

25V

1206

(1210)

1.0M

dc2235af

DEMO MANUAL DC2235A

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 0915 • 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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