DC1964A - Demo Manual

DEMO MANUAL DC1964A
LTC3110
2A, Bidirectional Buck-Boost
DC/DC Regulator
and Charger/Balancer
Description
Demonstration circuit 1964A is a 2A, bidirectional buckboost DC/DC regulator and charger/balancer, featuring
the LTC®3110 boost controller. Its wide voltage range both
in capacitor/battery charger mode and in system backup
mode makes it well suited to a wide variety of applications
using supercapacitors and batteries.
The main features of this board include a wide capacitor
voltage range from 0.1V to 5.5V, when the controller works
as a backup, buck-boost converter. The input voltage range
is also wide, 1.8V to 5.25V, when the controller works
as a charger. LTC3110 also features automatic switching from charge to backup mode, programmable ±2%
accurate charge current, automatic capacitor balancing,
Burst Mode® operation, multipurpose comparator, and
open-collector outputs to indicate direction of operation
and end of charge.
The 1.2MHz constant-frequency operation results in a small
and efficient circuit. In backup mode LTC3110 provides
high output voltage accuracy over a wide load range with
no minimum load requirement.
DC1964A features two modes of operation: automatic
and external direction control. In the automatic mode
of operation, DC1964 automatically charges the supercapacitor when a system voltage is present and works
as a DC/DC converter providing system backup power to
the load when system power is removed. In the external
direction mode, users have control over charging and
discharging the supercapacitor by changing logic on the
EXT/DIR terminal.
The DC1964A supports three levels of input current
limits—0.5A, 1A, 2A—while charging the supercapacitor.
The DC1964A has a small circuit footprint. It is a high
performance and cost effective solution for supercap,
battery backup converters and chargers, servers, RAID
and RF systems.
DC1964 supports surface-mount supercapacitors as
installed C3 and also through-hole packages as optional
C5, C8.
Design files for this circuit board are available at
http://www.linear.com/demo/DC1964A
L, LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
Performance Summary
PARAMETER
CONDITIONS
UNITS
Minimum Input Supply Voltage
1.8
V
Maximum Input Supply Voltage
5.5
V
1.8 to 5.25
V
System Voltage Range
Backup Mode
Supercapacitor Voltage Range
0.1V to 5.5
Typical Switching Frequency
1.2
MHz
93
%
Efficiency Typical, DC/DC Mode
Backup Mode
V
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1
DEMO MANUAL DC1964A
Quick Start Procedure
Demonstration circuit 1964A is easy to set up to evaluate
the performance of the LTC3110 bidirectional regulator.
Refer to Figure 1 for proper measurement equipment setup
and follow the procedure below. 5V power supply should
be rated minimum 2A of output current.
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.
5. Turn the input power source on and slowly increase the
input voltage to 4.0V. Set the load to 0.2A. You have to
see voltage around 3.6V (diode forward voltage drop
lower compared to VEXT) on the VSYS terminal.
6. Place jumper RUN (JP2) in the ON position. Voltage on
VCAP terminal should rise above 4.8V. If there is no
output, temporarily disconnect the load to make sure
that the load is not set too high.
To verify the ability of DC1964 to work in backup mode,
proceed with the following:
1. Place jumper MODE (JP4) to FIXED FREQ. position.
7. Disconnect input power from VEXT (E2) terminal, because SW1 in AUTO position, supercapacitor C3 starts
discharging, however LTC3110 will maintain a voltage
of 3.3V on terminal VSYS (E2).
2. Place jumper FBCAP (JP5) to 5.0V position. Place jumper
PROG (JP3) to 0.5A position. Place switch DIR (SW1)
to AUTO position for automatic switch between charge
or backup modes of operation.
8. Repeat steps 1 to 7 for different charging currents and
VSYS voltages. While discharging, increase load current
to 2.0A to verify high current capability and good load
regulation of LTC3110 controller.
3. Place jumper FB (JP1) into 3.2V to set 3.2V voltage on
the load, when supercapacitor C3 discharges in backup
mode.
9. You can measure voltage regulation and ripple in backup
mode on VSYS (E2) terminals.
To verify the capability of DC1964A for charging supercapacitors, proceed with the following steps:
4. With power off, connect the input power supply to
VEXT, GND load to VSYS, GND as shown on Figure 1.
10.Make sure that input voltage on VEXT and VSYS terminals does not exceed 5.5V.
Figure 1. Proper Measurement Equipment Setup
2
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DEMO MANUAL DC1964A
Quick Start Procedure
GND
VIN
Figure 2. Measuring Input or Output Ripple
Figure 3. Charging Mode, VSYS 2.5V, Input Current Set to 0.5A,
Ch 4 (Red) Input Current, 200mA/DIV, Ch3 (Blue) VCAP Voltage
95
94
Figure 4. Charging Mode, VSYS 2.5V, Input Current Set to 2.0,
Ch 4 (Red) Input Current, 1.0A/DIV, Ch3 (Blue) VCAP Voltage
VCAP = 5V
VSYS = 3.2V
EFFICIENCY (%)
93
92
91
90
89
88
0.25
0.45
0.65
0.85
1.05
1.25
1.45
1.65
LOAD (A)
1.85
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Figure 5. Efficiency vs Load, Backup Mode
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DEMO MANUAL DC1964A
Parts List
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
Required Circuit Components
1
1
C2
CAP., X5R, 47µF, 6.3V, 10%, 1210
AVX, 12106D476KAT2A
2
1
C3
SUPERCAP, 1.2F, 5.5V, 39mm x 17mm
CAP-XX, HS230F
3
1
C4
CAP., X5R, 1µF, 25V, 10%, 0603
AVX, 06033D105KAT2A
4
1
C11
CAP., X5R, 10µF, 10V, 20%, 0603
AVX, 0603ZD106MAT2A
5
4
C6, C9, C15, R2
CAP., X5R, 0.1µF, 25V, 10%, 0603
AVX, 06033D104KAT2A
6
1
C11
CAP., X5R, 10µF, 10V, 20%, 0603
AVX, 0603ZD106MAT2A
7
1
C13
CAP., X5R, 470pF, 25V, 10%, 0603
AVX, 06033D471KAT2A
8
1
D1
DIODE, SCHOTTKY 2A 30V SOD-123FL
ON SEMI., MBR230LSFT1G
9
1
D2
DIODE, SW DUAL 75V 200MW SC70-3
DIODE, BAV70W-7-F
10
1
L1
POWER INDUCTOR, 2.2uH
COILCRAFT, XAL5030-222MEB
11
1
R1
RES., CHIP, 24, 1%, 0603
VISHAY, CRCW060324R0FKEA
12
1
R3
RES., CHIP, 634k, 1%, 0603
VISHAY, CRCW0603634KFKEA
13
1
R4
RES., CHIP, 576k, 1%, 0603
VISHAY, CRCW0603576KFKEA
14
1
R5
RES., CHIP, 1.02M, 1%, 0603
VISHAY, CRCW06031M02FKEA
15
2
R7, R8
RES., CHIP, 6.04k, 1%, 0603
YAGEO, RC0603FR-076K04L
16
1
R9
RES., CHIP, 200k, 1%, 0603
VISHAY, CRCW0603200KFKEA
17
1
R10
RES., CHIP, 1.91M, 1%, 0603
VISHAY, CRCW06031M91FKEA
18
1
R12
RES., CHIP, 280k, 1%, 0603
VISHAY, CRCW0603280KFKEA
19
1
R13
RES., CHIP, 2k, 1%, 0603
VISHAY, CRCW06032K00FKEA
20
1
R14
RES., CHIP, 1.5M, 1%, 0603
VISHAY, CRCW06031M50FKEA
21
1
R15
RES., CHIP, 845k, 1%, 0603
VISHAY, CRCW0603845KFKEA
22
2
R16, R17
RES., CHIP, 100k, 1%, 0603
VISHAY, CRCW0603100KFKEA
23
1
R18
RES., CHIP, 931k, 1%, 0603
VISHAY, CRCW0603931KFKEA
24
1
R19, R20
RES., CHIP, 1M, 1%, 0603
VISHAY, CRCW06031M00FKEA
25
1
R22
RES., CHIP, 1K, 1%, 0603
VISHAY, CRCW06031K00FKEA
26
1
U1
IC., LTC3110EUF, QFN 4mm × 4mm
LINEAR TECH., LTC3110EUF#PBF
Additional Demo Board Circuit Components
1
C1, C5, C8, C10, C14, C16, C17
OPT
2
R6, R11, R21
OPT
Hardware: For Demo Board Only
4
1
1
JP3
HEADER, 0.079 SINGLE ROW 5 PIN
SULLINS, NRPN051PAEN-RC
2
4
JP1, JP2, JP5, JP6
HEADER, 0.079 SINGLE ROW 3 PIN
SULLINS, NRPN031PAEN-RC
3
5
JP1, JP2, JP3, JP5, JP6
SHUNT
SAMTEC, 2SN-BK-G
4
13
E1-E6, E8-E14
TESTPOINT, TURRET, .095"
MILL-MAX, 2501-2-00-80-00-00-07-0
5
1
SW1
SWITCH, TOGGLE SPDT ULTMINI PC TH LT 5/08/12
C & K, GT11MCBETR
dc1964afa
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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
A
B
C
D
GND
EXT.DIR
CHRGB
JP1
FB
3.2V
1.8V
E4
E2
E14
E10
R11
OPT
R4
576K
2
1.8V - 5.25V
VSYS
E1
100uF
6.3V
OPT
7343
+ C17
5
R12
280K
R9
200K
C15
0.1uF
C2
47uF
1210
R21
OPT
R20
1 Meg
3
EXT.DIR
AUTO
DIR
SW1
2
4
8
6
7
11
10
12
C13
470pF
OPT
R16 100K
4
2
JP3
PROG
2A
1A
R1
24
C10 OPT
C4
1uF
9
DIR
CHRGB
FB
PROG
RSEN
VSYS
VSYS
SVSYS
LTC3110EUF
2. * R2 IS OPTIONAL.
1. ALL RESISTORS ARE 0603.
ALL CAPACITORS ARE 0603.
4
U1
L1 2.2uH
XAL5030-222ME
NOTES: UNLESS OTHERWISE SPECIFIED
C14
OPT
R18 931K
R13 2.0K
R8 6.04K
R7 6.04K 0.5A
VSYS
C1
22uF
OPT
1210
MBR230LSFT
R5
R6
1.02Meg OPT
100uF
6.3V
OPT
7343
+ C16
VSYS
1
17
SW1
D1
4
13
VEXT
3
1
14
VCAP
VCAP
VMID
RUN
CMPIN
CMPOUTB
CAPOK
MODE
FBVCAP
SW2
2
1
5
3
1
2
1 Meg
FIXED FREQ.
BURST
JP4
MODE
C6
0.1uF
OFF
ON
JP2
RUN
3
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
CUSTOMER NOTICE
R19
R17 1 Meg
C11
10uF
0.1uF
2
D2
BAV70W
2
R22
1K
1
R14
1.5Meg
R10
1.91Meg
2
SCALE = NONE
2
2
VICTOR K.
HZ
APPROVALS
R2*
0.1uF
R3
634K
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
PCB DES.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APP ENG.
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
23
22
24
2
20
19
21 C9
5
1
3
3
18
SW1
SGND
3
GND
15
GND
16
1
3
3
BAL
V+
2
C5
5F
OPT
E6
E5
CMPOUTB
CAPOK
GND
GND
GND
VMID
GND
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
E13
E12
E11
E9
E8
TECHNOLOGY
+
C8
5F
OPT
DATE
4-29-15
LTC3110EUF
DEMO CIRCUIT 1964A
Wednesday, April 29, 2015
IC NO.
1
SHEET 1
2
OF 1
REV.
2A, BIDIRECTIONAL BUCK-BOOST DC / DC REGULATOR
AND CHARGER / BALANCER
DATE:
N/A
SIZE
TITLE: SCHEMATIC
R15
845K
2.5V
5.0V
+
VCAP
MAX. 5.5V
VICTOR K.
E3
APPROVED
PRODUCTION
2
1
DESCRIPTION
REVISION HISTORY
REV
C3
HS230F
1.2F
5.5V
ECO
JP5 FBVCAP
1
SW2
GND
25
3
1
3
1
5
A
B
C
D
DEMO MANUAL DC1964A
Schematic Diagram
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5
DEMO MANUAL DC1964A
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
6
dc1964afa
Linear Technology Corporation
LT 0615 REV A • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507 ● www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2013
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