Linear Technology DC1793A Quick setup guide

dc1793afa

DEMO MANUAL DC1793A

DESCRIPTION

LTC3260EMSE

High Voltage, Low Noise, Dual Supply

Inverting Charge Pump

Demonstration circuit 1793A is a high voltage inverting

charge pump with low noise dual-polarity LDO regula-

tors featuring the LTC

3260EMSE. The LTC3260 operates

with an input voltage from 4.5V to 32V. The demo board

provides selectable LDO± output set magnitudes of

3.3V, 5V, 12V and 24V for each polarity. Additional LDO±

set point jumper selections and optional topside ADJ±

resistors allow the user to set other desired LDO± output

voltages. The demo boardalso provides the meansto select

between Burst Mode

operation or 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.

mode operation, plus select an operating frequency of

500kHz, 200kHz, and 50kHz.

The LTC3260 data sheet gives a complete description of

the device, operation and application information. The

data sheet must be read in conjunction with this quick

start guide for demo circuit 1793A.

Design files for this circuit board are available at

http://www.linear.com/demo

PERFORMANCE SUMMARY

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VIN Input Voltage 4.5 32 V

VLDO+ LDO+ Output Voltage VIN ≥ LDO+ Set Point + 0.8V 1.2 32 V

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

VOUT Output Voltage MODE = 0V

MODE ≥ 2V

–VIN

–0.94 • VIN

QUICK START PROCEDURE

Refer to Figure 1 for the proper measurement equipment

setup and jumper settings, and follow the procedure

below.

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 in the ON position.

JP2: EN– is in the ON position.

JP3: MODE is in the BURST position.

JP4: FREQ is in the 500kHz position.

JP5: LDO+ is set to the 5V setting.

JP6: LDO– is set to the –5V setting.

2. Set PS1 to 12V.

Specifications are at TA= 25°C

dc1793afa

DEMO MANUAL DC1793A

QUICK START PROCEDURE

3. Slowly increase the load on LDO– to –50mA and

observe how the output ripple on VOUT changes and

how the burst frequency increases. When the load

is large enough, the charge pump will run constant

frequency to keep VOUT in regulation.

4. SlowlyincreasetheloadonLDO+to50mAandobserve

the output ripple and the output voltage on LDO+.

5. Set the LDO+ load and the LDO– load to 0mA and

turn off PS1.

NOTE: To avoid applying an overvoltage to the ADJ±

pins, power must be turned off before changing the

LDO+ or LDO– jumpers.

6. Set the JP5 LDO+ jumper to the 3.3V position and JP6

LDO– to the –3.3V position.

7. Repeat steps 2 through 5.

8. Set the JP5 LDO+ jumper to the 12V position and JP6

LDO– to the –12V position.

9. Turn on and set PS1 to 15V.

10. Repeat steps 3 through 5.

11. Set the JP5 LDO+ jumper to the 24V position and JP6

LDO– to the –24V position.

12. Turn on and set PS1 to 32V.

13. Repeat steps 3 through 6.

14. Turn on and set PS1 to 12V.

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

observe the output ripple and output voltage on VOUT.

16. Set the load on VOUT to 0mA.

17. Change the JP3 MODE jumper from Burst Mode op-

eration to constant-frequency mode and repeat steps

14 and 15.

18. Change the 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 volt-

age on VOUT.

19. Set the load on VOUT to 0mA.

20. Change the JP4 FREQ jumper from 200kHz to

50kHz. Slowly increase the load on VOUT from 0mA

to –10mA and observe the output ripple and output

voltage on VOUT.

Figures 4 and 5 illustrate how the efficiency varies with

load current in Burst Mode operation and in constant-

frequency mode operation.

Figure 1. Proper Measurement Equipment Setup for DC1793A

0-50mA 0- 50mA

dc1793afa

DEMO MANUAL DC1793A

QUICK START PROCEDURE

–IVOUT (mA)

EFFICIENCY (%)

10 100

dc1793a F04

50kHz CF MODE

200kHz CF MODE

500kHz CF MODE

VIN = 12V, CONSTANT FREQUENCY

+LDO DISABLED

–LDO = –5V, 0A

Figure 2. Measuring Input or Output Ripple

Figure 3. LDO Rejection of VOUT Ripple

Figure 4. VIN to VOUT Constant-Frequency Mode Operation Efficiency

VLDO+

10mV/DIV

AC-COUPLED

VLDO–

10mV/DIV

AC-COUPLED

VOUT

10mV/DIV

AC-COUPLED

1μs/DIV dc1793a F03

VIN = 15V

VLDO+= 12V

VLDO–= –12V

fOSC = 500kHz

ILDO+= 50mA

ILDO––50mA

GND

VIN

dc1793a F02

dc1793afa

DEMO MANUAL DC1793A

Figure 5. VIN to VOUT Burst Mode Operation Efficiency

QUICK START PROCEDURE

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 4 C2, C3, C6, C10 CAP, CER, 10μF, 50V, X7S, 10%, 1210 TDK, C3225X7S1H106K

2 1 C4 CAP, CER, 1μF, 50V, X7R, 10%, 1206 MURATA, GRM31MR71H105KA88

3 2 R11, R18 RES, 100k, 1/16W, 1%, 0402, SMD VISHAY, CRCW0402100KFKED

4 1 U1 LOW NOISE DUAL-SUPPLY INVERTING CHARGE PUMP LINEAR TECHNOLOGY, LTC3260EMSE#PBF

Additional Demo Board Circuit Components

5 1 C1 CAP, CER, 4.7μF, 50V, X7R, 10%, 1210 MURATA, GRM32ER71H475KA88L

6 0 C5, C7, C9 (OPT) CAP, CER, 0603, 50V OPT

7 2 C8, C11 CAP, CER, 0.01μF, 25V, X7R, 10%, 0402 MURATA, GRM155R71E103KA01D

8 3 R1, R8, R10 RES, 1MΩ, 1/16W, 5%, 0402, SMD VISHAY, CRCW04021M00JNED

9 2 R2, R13 RES, 1.91MΩ, 1/16W, 1%, 0402, SMD VISHAY, CRCW04021M91FKED

10 2 R3, R14 RES, 909k, 1/16W, 1%, 0402, SMD VISHAY, CRCW0402909KFKED

11 2 R5, R16 RES, 174k, 1/16W, 1%, 0402, SMD VISHAY, CRCW0402174KFKED

12 0 R6, R17 (OPT) RES, 0402, SMD OPT

13 3 R7, R9, R12 RES, 1k, 1/16W, 5%, 0402, SMD VISHAY, CRCW04021K00FKED

14 1 R19 RES, 1MΩ, 1/16W, 1%, 0402, SMD VISHAY, CRCW04021M00FKED

15 1 R20 RES, 200k, 1/16W, 1%, 0402, SMD VISHAY, CRCW0402200KFKED

Hardware: For Demo Board Only

17 3 JP1-JP3 HEADER, 3 PIN, 1 ROW, 0.079" SAMTEC, TMM-103-02-L-S

18 1 JP4 HEADER, 4 PIN, 1 ROW, 0.079" SAMTEC, TMM-104-02-L-S

19 2 JP5, JP6 HEADER, 2×5 PINS, 2mm SAMTEC, TMM-105-02-L-D

20 6 JP1-JP6 SHUNT, 2mm SAMTEC, 2SN-KB-G

21 8 E1, E2, E7-E12 TP, TURRET, 0.094", PBF MILL-MAX, 2501-2-00-80-00-00-07-0

22 4 E3-E6 TURRET, 0.061", DIA MILL-MAX, 2308-2-00-80-00-00-07-0

–IVOUT (mA)

EFFICIENCY (%)

10 100

dc1793a F05

VIN = 12V, Burst Mode OPERATION

+LDO DISABLED

–LDO = –5V, 0A

fOSC = 500kHz

dc1793afa

DEMO MANUAL DC1793A

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

Figure 6. LTC3260EMSE Low Noise Dual Supply Inverting Charge Pump

ALL CAPACITORS ARE 0402, 10%

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

4.5V - 32V

2. INSTALL SHUNTS AS SHOWN.

NOTE: UNLESS OTHERWISE SPECIFIED

( - VIN )

100mA

OPT

24V

12V

3.3V

50mA

OPT

-24V

50mA

-5V

-12V

-3.3V

FREQ

M. MERCHANTPRODUCTION FAB203- 12 -12

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

DEMO CIRCUIT 1793A

LOW NOISE DUAL SUPPLY INVERTING CHARGE PUMP

N/A LTC3260EMSE

MARTY M.

03- 12 -12

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCBDES.

APPENG.

TECHNOLOGY

Fax: (408)434-0507

Milpitas,CA95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGYHASMADEA BEST EFFORT TO DESIGNA

CIRCUIT THAT MEETSCUSTOMER-SUPPLIEDSPECIFICATIONS;

HOWEVER,ITREMAINS THE CUSTOMER'S RESPONSIBILITYTO

VERIFYPROPER AND RELIABLEOPERATIONIN THE ACTUAL

APPLICATION. COMPONENTSUBSTITUTIONAND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLYAFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGYAPPLICATIONSENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIEDFORUSEWITH LINEAR TECHNOLOGYPARTS.

SCALE = NONE

www.linear.com

VOUT

VIN

EN -

JP3

MODE

CONT

BURST

E7 VOUT

OPT

50V

0603

OPT

GND

1.0M

VIN C2

10uF

50V

1210

JP1

EN+

OFF

316K

R12

1K R15

316K

E10 GND

E8 GND

R16

174K

R19

1.0M

JP2

EN-

OFF

1uF

50V

1206

10uF

50V

1210

JP4

FREQ

50KHz

200KHz

500KHz

R13

1.91M

E11 LDO-

R17

OPT

R20

200K

C11

0.01uF

25V

10uF

50V

1210

JP6

LDO-

R18

100K

1.0M

E12 GND

R10

1.0M

174K

MODE

1.91M

EN+

JP5

LDO+

0.01uF

25V

OPT

50V

0603

GND

R14

909K

4.7uF

50V

1210

OPT

50V

0603

LTC3260EMSE

2 3

EN+

RT BYP-

ADJ-

LDO -

VOUT

C-

C+

VIN

LDO +

EN-

MODE

ADJ+

BYP+

GND

909K

E9 LDO +

R11

100K

C10

10uF

50V

1210

dc1793afa

DEMO MANUAL DC1793A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

LT 0114 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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