Linear Technology DC1793A Quick setup guide

1
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
V
V
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

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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

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DEMO MANUAL DC1793A
QUICK START PROCEDURE
–IVOUT (mA)
1
10
EFFICIENCY (%)
20
30
50
70
10 100
40
60
80
15
25
35
55
75
45
65
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

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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)
1
65
EFFICIENCY (%)
70
10 100
80
75
dc1793a F05
VIN = 12V, Burst Mode OPERATION
+LDO DISABLED
–LDO = –5V, 0A
fOSC = 500kHz

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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
5V
OPT
24V
12V
3.3V
50mA
OPT
-24V
50mA
-5V
-12V
-3.3V
FREQ
M. MERCHANTPRODUCTION FAB203- 12 -12
REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
2
DEMO CIRCUIT 1793A
11
LOW NOISE DUAL SUPPLY INVERTING CHARGE PUMP
N/A LTC3260EMSE
NC
MARTY M.
03- 12 -12
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCBDES.
APPENG.
TECHNOLOGY
Fax: [phone] Milpitas,CA95035 Phone: [phone] 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
VIN
VIN
VIN
E4
EN -
JP3
MODE
CONT
BURST
1 3 2
E7 VOUT
C9 OPT 50V 0603
R6
OPT
E6
GND
R1
1.0M
5%
E1
VIN C2
10uF
50V
1210
JP1
EN+
ON
OFF
1 3 2
R4
316K
R12
1K R15
316K
E10 GND E8 GND
R16 174K
R19
1.0M
JP2 EN-
ON
OFF
1 3 2
C4
1uF 50V
1206
C3
10uF 50V
1210
JP4
FREQ
50KHz
200KHz 500KHz
1 2 3 4
R13 1.91M
R9
1K
E11 LDO-
R17 OPT
R20 200K
C11 0.01uF 25V
C6 10uF 50V 1210
JP6
LDO-
R18 100K
R8 1.0M
5%
E12 GND
R10 1.0M
5%
R5
174K
E5
MODE
R2
1.91M
E3
EN+
JP5
LDO+
C8 0.01uF 25V
C7
OPT
50V 0603
E2
GND
R14 909K
R7
1K
C1
4.7uF 50V
1210
C5
OPT 50V 0603
U1 LTC3260EMSE
1 2 3
4 5 6
7
10 11
12
13 14
15 16
17
8 9
EN+ RT BYP-
ADJ-
LDO -
VOUT
C- C+ VIN
LDO +
EN- MODE
ADJ+
BYP+
GND
NC NC
R3
909K
E9 LDO +
R11 100K
C10 10uF
50V
1210

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dc1793afa
DEMO MANUAL DC1793A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2012
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
Copyright © 2004, Linear Technology Corporation

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