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DESCRIPTION
Demonstration circuit 2133A features a simple battery
charger circuit using the
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 V
above the LTC4079 UVLO threshold.
IN
PERFORMANCE SUMMARY
PARAMETER
Input Voltage Range
Default Charging Voltage
Default Charging Current
PROG Pin Voltage
Input Regulation Voltage
Default Charge Timer
LTC
4079
high-voltage mono-
®
Specifications are at T
CONDITIONS
V
= 4.2
BAT
R
= 3.01k
PROG
R
= 3.01k, I
PROG
EN = REG (JP1)
C
= 0.068μF
TMR
100
240mAh Li-Ion
90
V
= 5V
IN
R
= 3.01k
PROG
80
C
= 0.068µF
TMR
70
60
50
V
40
BAT
30
20
10
0
0
1
Figure 1. Typical Battery Charge Cycle
DEMO MANUAL DC2133A
60V, 250mA Linear Charger
with Low Quiescent Current
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
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.
= 25°C
A
= 99mA
CHG
5.2
CHRG
5.0
4.8
4.6
I
4.4
BAT
4.2
4
3.8
C/10
3.6
TERMINATION
3.4
3.2
2
3
4
5
TIME (HOURS)
dc2133a F01
LTC4079
TYPICAL VALUE
2.7V to 60V
4.2V
99mA
2.5V
10.3V
3h 45 min
dc2133afa
1
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Related Manuals for Linear Technology DC2133A
Summary of Contents for Linear Technology DC2133A
- Page 1 10nA from the battery. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear DC2133A is initially configured to enable charging from Technology Corporation. All other trademarks are the property of their respective owners.
- Page 2 DEMO MANUAL DC2133A QUICK START PROCEDURE Demonstration circuit 2133 is easy to set up to evaluate 5. Allow the battery to charge for a complete cycle. CHRG the performance of LTC4079. Refer to Figure 2 for proper will disable the LED when the charge current has dropped...
-
Page 3: Quick Start Procedure
DEMO MANUAL DC2133A QUICK START PROCEDURE – BATTERY Figure 2. Proper Measurement Equipment Setup dc2133afa... -
Page 4: Parts List
DEMO MANUAL DC2133A PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components C1, C3 CAP, CHIP, X7R,1μF, 20%, 100V, 1210 AVX, 12101C105MAT2A CAP, CHIP, X5R,6.8µF, 10%, 25V, 1210 TDK, C3225X5R1E685K CTMR CAP, CHIP, X7R, 0.068μF, 10%, 50V, 0603... -
Page 5: Schematic Diagram
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. - Page 6 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.
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