Linear Technology LTC3265EDHC Quick setup guide

1
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
V
V
VOUT–VOUT–Output Voltage Range MODE = 0V (Const. Freq.)
MODE ≥ 2V (Burst)
–VIN_N
–0.94 • VIN_N
V
V
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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
RT
1µF
VOUT+
VIN_P
10µF
10µF
10µF
+15V
12V
–15V
DC2235A TA01a
604K
52.3k
52.3k
604K
100nF
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.
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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
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DEMO MANUAL DC2235A
Figure 2. Measuring Input or Output Ripple
APPLICATIONS INFORMATION
QUICK START PROCEDURE
LOAD CURRENT (mA)
0.1
1
10
100
0
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
1
10
100
0
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.
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DEMO MANUAL DC2235A
APPLICATIONS INFORMATION
Figure 5. CISPR22 Radiated Emissions Figure 6. CISPR25 Conducted Emissions
FREQUENCY (MHz)
0
100
200
300
400
500
600
700
800
900
1000
–10
0
10
20
30
40
50
dBμV/m
dc2235 F05
V
IN
= 12V, V
OUT
= ±15V, 600Ω LOAD RESISTOR
WITHOUT C1 INSTALLED
V
IN
= 12V, V
OUT
= ±15V, 600Ω LOAD RESISTOR
WITH C1 = 10μF
CISPR22 LIMIT LINE
FREQUENCY (Hz)
100k
1M
10M
100M
0
10
20
30
40
50
60
70
80
90
100
110
AMPLITUDE (dBμV)
dc2235a F06
V
IN
= 12V, V
OUT
= ±15V, LOAD = 600Ω
WITHOUT C1 INSTALLED
V
IN
= 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.
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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
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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 ) *
5V
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
VIN_P
VIN_P
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: [phone]
Milpitas, CA 95035 Phone: [phone] 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
3
DEMO CIRCUIT 2235A
11
LOW NOISE DUAL SUPPLY WITH
N/A LTC3265EDHC
NC
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: [phone]
Milpitas, CA 95035 Phone: [phone] 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
3
DEMO CIRCUIT 2235A
11
LOW NOISE DUAL SUPPLY WITH
N/A LTC3265EDHC
NC
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: [phone]
Milpitas, CA 95035 Phone: [phone] 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
3
DEMO CIRCUIT 2235A
11
LOW NOISE DUAL SUPPLY WITH
N/A LTC3265EDHC
NC
MARTY M.
05 - 28 - 15
BOOST AND INVERTING CHARGE PUMPS
R13 1.0M
5%
E9
LDO +
C10 10uF
50V
1210
R16 200k
C4
1uF 25V
0805
C12
10uF
50V
1210
E2
GND
R14 4.7k 5%
R10 165k
R5
4.7k
5%
C2
10uF
25V
1206
(1210)
SW1
450301014042
E1
VIN_P
R8 1.0M
E7
VOUT+
E13
VOUT-
C3
10uF 50V
1210
R2 1.0M
JP5
LDO+
JP4
FREQ
50kHz
200kHz 500kHz
1 2 3 4
C11 0.1uF 16V
C6 10uF 50V 1210
E5
MODE
C9 OPT 25V 0603
E10
GND
C13
1uF 50V
1206
E4
EN -
R12 52.3k
JP3
MODE
CONST
BURST
1 3 2
R1
1.0M
5%
R7
4.7k
5%
U1 LTC3265
RT
12
BYP- 5
ADJ- 6
LDO - 7
VOUT+ 18
LDO + 17
EN-
4
MODE
14
ADJ+ 16
BYP+ 15
GND
19
VOUT- 8
CINV-
9
CINV+
10
VIN_N
11
EN+
13
VIN_P
3
CBST+
2
CBST-
1
C5
OPT 25V 0603
JP1
EN+
ON
OFF
1 3 2
E11
LDO -
C16 10pF 50V
R3
604k
JP6
LDO-
C7
OPT
25V 0603
C8 0.1uF 16V
C14 10uF
50V
1210
E14
GND
E8
GND
R15
909k
C15 10pF 50V
E3
EN+
R11 52.3k
E6
GND
E12
GND
R9 604k
JP2 EN -
ON
OFF
1 3 2
R4
165k
C1
10uF 25V
1206
(1210)
R6 1.0M
5%
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DEMO MANUAL DC2235A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●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
Copyright © 2004, Linear Technology Corporation
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