Linear Technology DC2133A Quick setup guide

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dc2133afa
DEMO MANUAL DC2133A
DESCRIPTION
LTC4079
60V, 250mA Linear Charger
with Low Quiescent Current
Demonstration circuit 2133A features a simple battery
charger circuit using the LT C
®
4079 high-voltage mono-
lithic 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 jumper-
selectable 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.
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
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.
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
Figure 1. Typical Battery Charge Cycle
PARAMETER 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
TIME (HOURS)
0
100
80
60
40
20
90
70
50
30
10
0
1
dc2133a F01
532 4
IBAT (mA)
3.2
3.6
5.2
3.4
3.8
4.6
4.4
4.2
4
5.0
4.8
VBAT & VCHRG (V)
C/10
TERMINATION
CHRG
240mAh Li-Ion
VIN = 5V
RPROG = 3.01k
CTMR = 0.068µF
IBAT
VBAT

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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.
1. The jumpers are initially set as below for a typical 4.2V
charging application:
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 representa-
tion of the output current according to the relationship:
I
BAT =
250 • V
PROG
R
PROG
Note: Minimize capacitance on the PROG pin to prevent
charger instability.
5. Allow the battery to charge for a complete cycle. CHRG
willdisabletheLEDwhenthechargecurrenthasdropped
below 10mA, but the timer will continue to run and
charge current will flow until the timer period ends.
Optional
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. Usean external thermistor connectedto 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.

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DEMO MANUAL DC2133A
QUICK START PROCEDURE
Figure 2. Proper Measurement Equipment Setup
+
+
–
BATTERY
V
A
v

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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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DEMO MANUAL DC2133A
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
5
5
4
4
3
3
2
2
1
1
D D C C B B A A
ALL CAPACITORS ARE IN MICROFARADS, 0603.
NOTES: UNLESS OTHERWISE SPECIFIED 1. ALL RESISTORS ARE IN OHMS, 1%, 0603.
GND NTC
BAT
100mA
GND
VIN
6.5V - 60V
CHRG
TIMER
NTCBIAS
PROG
5%
.5W
5%
5%
REG
GND
EN
ON OFF
2. VBAT SET BY JP4. DO NOT CHANGE JP4
WITH VIN APPLIED.
GND
3. OPTIONAL CIRCUIT FOR EVALUATION
WITHOUT BATTERY.
SEE NOTE 3
SEE NOTE 2
SEE NOTE 2
VIN
VIN
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
2
LTC4079IDD
Tuesday, October 14, 2014 1 1
60V LINEAR CHARGER WITH LOW QUIESCENT CURRENT
LT
JOSHUA Y.
N/A
DEMO CIRCUIT 2133A
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
2
LTC4079IDD
Tuesday, October 14, 2014 1 1
60V LINEAR CHARGER WITH LOW QUIESCENT CURRENT
LT
JOSHUA Y.
N/A
DEMO CIRCUIT 2133A
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
2
LTC4079IDD
Tuesday, October 14, 2014 1 1
60V LINEAR CHARGER WITH LOW QUIESCENT CURRENT
LT
JOSHUA Y.
N/A
DEMO CIRCUIT 2133A
REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
JOSHUA Y.
PRODUCTION
210-14-14
_
REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
JOSHUA Y.
PRODUCTION
210-14-14
_
REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
JOSHUA Y.
PRODUCTION
210-14-14
_
C2 6.8uF
1210
C2 6.8uF
1210
R5 100K R5 100K
R11 12K 0805 R11 12K 0805
R10
100K
R10
100K
E7E7
R8
412K
R8
412K
E9E9
R1 1 0805 R1 1 0805 C1 1uF 1210 C1 1uF 1210
JP3
ON
OFF
TIMER
JP3
ON
OFF
TIMER
1 3 2
JP4
8.4V 4.2V
VBAT
JP4
8.4V 4.2V
VBAT
1 3 2
E4E4
E2E2
E10E10
E6E6
E8E8
JP2
EXT INT
NTC JP2
EXT INT
NTC
1 3 2JP5
ONOFF
LEDJP5
ONOFF
LED
1
3
2
R6 100K R6 100K
CTMR .068uF CTMR .068uF
E11E11
R7 1.07Meg 0805 R7 1.07Meg 0805
C3 1uF
1210
C3 1uF
1210
- +
LED1
GRN
- +
LED1
GRN
U1
LTC4079IDD
U1
LTC4079IDD
NTCBIAS
4
IN
1BAT 10
FB 9
FBG 8
CHRG 7
EN
2
PROG
3
TIMER 6
NTC
5
GND
11
R3 768K 0805 R3 768K 0805
R4 3.01K R4 3.01K
R9 12K 1210 R9 12K 1210
E1E1
JP1JP1
1 3 56
4 2
78
R12 2.55Meg 0805 R12 2.55Meg 0805
E3E3 E5E5
R2 100K R2 100K

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dc2133afa
DEMO MANUAL DC2133A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2014
LT 1014 • 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
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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
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