DC2133A - Demo Manual

DEMO MANUAL DC2133A
LTC4079
60V, 250mA Linear Charger
with Low Quiescent Current
DESCRIPTION
Demonstration circuit 2133A features a simple battery
charger circuit using the LTC®4079 high-voltage monolithic linear charger. The DC2133 has an input voltage
range from 2.7V to 60V and is capable of supplying up
to 250mA charge current. The charge voltage is jumperselectable to 4.2V or 8.4V. Charge current is adjustable
via the PROG pin and initially programmed for 99mA. In
shutdown or when unpowered, LTC4079 consumes only
10nA from the battery.
The NTC input is connected to an on-board resistance to
enable charging with only a 2-wire battery connection;
however an external thermistor may be used with the
NTC test point.
DC2133A is initially configured to enable charging from
application of VIN above the LTC4079 UVLO threshold.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
PERFORMANCE SUMMARY
PARAMETER
Termination is accomplished by timer method. Charging
status is reflected by the CHRG LED.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2133A
Specifications are at TA = 25°C
CONDITIONS
TYPICAL VALUE
Input Voltage Range
2.7V to 60V
Default Charging Voltage
VBAT = 4.2
4.2V
Default Charging Current
RPROG = 3.01k
99mA
PROG Pin Voltage
RPROG = 3.01k, ICHG = 99mA
2.5V
Input Regulation Voltage
EN = REG (JP1)
10.3V
Default Charge Timer
CTMR = 0.068μF
3h 45 min
100
240mAh Li-Ion
VIN = 5V
RPROG = 3.01k
CTMR = 0.068µF
90
80
IBAT (mA)
60
5.0
4.8
4.6
4.4
IBAT
4.2
50
VBAT
40
30
4
3.6
TERMINATION
10
0
3.8
C/10
20
0
1
2
3
TIME (HOURS)
4
VBAT & VCHRG (V)
70
5.2
CHRG
3.4
5
3.2
dc2133a F01
Figure 1. Typical Battery Charge Cycle
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DEMO MANUAL DC2133A
QUICK START PROCEDURE
Demonstration circuit 2133 is easy to set up to evaluate
the performance of LTC4079. Refer to Figure 2 for proper
measurement equipment setup and follow the procedure
below.
5.Allow the battery to charge for a complete cycle. CHRG
will disable the LED when the charge current has dropped
below 10mA, but the timer will continue to run and
charge current will flow until the timer period ends.
1.The jumpers are initially set as below for a typical 4.2V
charging application:
Optional
JP1
JP2
JP3
JP4
JP5
EN
NTC
TIMER
VBAT
LED
ON
INT
ON
4.2
ON
2.With all power off, connect the input supply, battery,
and meters as shown in Figure 2.
Note: Depending on the input cable and power supply
impedance, hot plugging an input supply may cause
overvoltage transients that can damage the board. R1
and C1 form an input transient damping network that
mitigates this. See AN-88 for component selection.
3.Turn on the input power supply. Adjust the input voltage
and current limit to the desired value.
4.Monitor the PROG pin voltage for a scaled representation of the output current according to the relationship:
IBAT =
250 • VPROG
RPROG
1.While powered off, change the setting of the EN jumper,
JP1, to REG to evaluate the enable input regulation
feature, or to OFF to disable charging.
2.Use an external thermistor connected to the NTC jumper,
JP2, set to EXT.
3.To terminate charge on current, disable the TIMER
input with JP3 set to OFF. LTC4079 will terminate on
C/10 only.
4.The CHRG LED can be disconnected to measure the
true quiescent current of the LTC4079 in shutdown or
for connection to external pull-up logic by setting the
LED jumper, JP5 to OFF.
5.To change the battery charging voltage, set the VBAT
jumper, JP4. Alternatively, the feedback resistors may
be adjusted for custom values, according to the battery
voltage.
Note: DO NOT change the VBAT with VIN applied.
Note: Minimize capacitance on the PROG pin to prevent
charger instability.
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DEMO MANUAL DC2133A
QUICK START PROCEDURE
A
+
–
+
v
V
BATTERY
Figure 2. Proper Measurement Equipment Setup
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DEMO MANUAL DC2133A
PARTS LIST
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
Required Circuit Components
1
1
C1, C3
CAP, CHIP, X7R,1μF, 20%, 100V, 1210
AVX, 12101C105MAT2A
2
1
C2
CAP, CHIP, X5R,6.8µF, 10%, 25V, 1210
TDK, C3225X5R1E685K
3
1
CTMR
CAP, CHIP, X7R, 0.068μF, 10%, 50V, 0603
MURATA, GRM188R71H683KA93D
4
3
R2, R5, R6
RES, CHIP, 100kΩ, 1%, 0603
VISHAY, CRCW0603100KFKEA
5
1
R3
RES, CHIP, 768kΩ, 1%, 0805
VISHAY, CRCW0805768KFKEA
6
1
R4
RES, CHIP, 3.01kΩ, 1%, 0603
VISHAY, CRCW06033K01FKEA
7
1
R7
RES, CHIP, 1.07MΩ, 1%, 0805
VISHAY, CRCW08051M07FKEA
8
1
R8
RES, CHIP, 412kΩ, 1%, 0603
VISHAY, CRCW0603412KFKEA
9
1
R12
RES, CHIP, 2.55MΩ, 1%, 0805
VISHAY, CRCW08052M55FKEA
10
1
U1
I.C., LTC4079IDD
LINEAR TECH., LTC4079IDD#PBF
Additional Demo Board Circuit Components
1
1
LED1
DIODE, LED, SMT, GREEN, 0603
LITE-ON, LTST-C190KGKT
2
1
R1
RES, CHIP, 1Ω, 5% 0805
VISHAY, CRCW08051R00JNEA
3
1
R9
RES, CHIP, 12kΩ, 3/4W, 5%, 1210
VISHAY, CRCW121012K0JNEAHP
4
1
R10
RES, CHIP, 100kΩ, 1%, 0603
VISHAY, CRCW0603100KFKEA
5
1
R11
RES, CHIP, 12kΩ, 5%, 0805
VISHAY, CRCW080512K0JNEA
Hardware: For Demo Board Only
1
4
E1, E2, E6, E7
TEST POINT, TURRET, 0.094"
MILL-MAX, 2501-2-00-80-00-00-07-0
2
7
E3, E4, E5, E8, E9, E10, E11
TEST POINT, TURRET, 0.062"
MILL-MAX, 2308-2-00-80-00-00-07-0
3
1
JP1
2 x 4 PIN JUMPER, 0.1"
SAMTEC, TSW-104-07-L-D
4
4
JP2, JP3, JP4, JP5
3 PIN JUMPER, 2mm
SULLINS, NRPN031PAEN-RC
5
1
XJP1
SHUNT, 2 x 2, 0.1"
SAMTEC, MNT-102-BK-G
6
4
XJP2, XJP3, XJP4, XJP5
SHUNT, 0.079"
SAMTEC, 2SN-BK-G
7
4
STAND-OFF
STAND-OFF, NYLON 0.25"
KEYSTONE, 8831(SNAP ON)
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4
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
E10
E5
E4
E11
E3
E2
C1
1uF
1210
100K
5%
R10
INT
EXT
5
3. OPTIONAL CIRCUIT FOR EVALUATION
WITHOUT BATTERY.
2. VBAT SET BY JP4. DO NOT CHANGE JP4
WITH VIN APPLIED.
1. ALL RESISTORS ARE IN OHMS, 1%, 0603.
ALL CAPACITORS ARE IN MICROFARADS, 0603.
NOTES: UNLESS OTHERWISE SPECIFIED
GND
NTC
NTCBIAS
GND
PROG
GND
6.5V - 60V
R1
1
5%
0805
3
2
1
JP1
EN
1
3
5
7
ON
REG
OFF
5
4
3
2
1
CUSTOMER NOTICE
R6
100K
R5
100K
R4
3.01K
2
4
6
8
NTC
NTCBIAS
PROG
EN
IN
4
3
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
FBG
FB
BAT
6
7
8
9
10
JP3
TIMER
SCALE = NONE
JOSHUA Y.
LT
APPROVALS
ON
OFF
TIMER
CHRG
U1
LTC4079IDD
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.
NTC
JP2
R2
100K
R3
768K
0805
CTMR
.068uF
TECHNOLOGY
ON
LED
TIMER
CHRG
GND
SEE NOTE 2
E9
E8
E7
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
C2
6.8uF
1210
C3
1uF
1210
BAT
100mA
DATE:
IC NO.
2
Tuesday, October 14, 2014
DEMO CIRCUIT 2133A
LTC4079IDD
1
SHEET 1
2
OF 1
REV.
60V LINEAR CHARGER WITH LOW QUIESCENT CURRENT
N/A
SIZE
R9
12K
.5W
1210
LED1
- GRN
+
VIN
R11
12K
5%
0805
E6
JOSHUA Y.
SEE NOTE 3
DATE
10-14-14
APPROVED
PRODUCTION
1
DESCRIPTION
REVISION HISTORY
R7
1.07Meg
0805
OFF
1
JP5
TITLE: SCHEMATIC
3
2
1
412K
R8
3
SEE NOTE 2
2
1
4.2V
VBAT
R12
2.55Meg
0805
2
REV
8.4V
JP4
_
ECO
2
2
VIN
VIN
3
GND
11
E1
4
3
D
5
A
B
C
D
DEMO MANUAL DC2133A
SCHEMATIC DIAGRAM
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DEMO MANUAL DC2133A
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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6
Linear Technology Corporation
LT 1014 • 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 2014
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