DC705A - Demo Manual

DEMO MANUAL DC705A
LTC4053EMSE-4.2
Lithium-Ion Linear Battery Charger
with Thermal Regulation
Description
Demonstration circuit DC705 is a complete constantcurrent, constant-voltage battery charger designed to
charge one Lithium-Ion cell. The LTC®4053EMSE-4.2 used
on this demo circuit features an internal P-channel power
MOSFET with a unique thermal feedback loop that reduces
the output current under high ambient temperature and/or
high power dissipation conditions. This feature allows the
charger to provide higher charge currents under normal
conditions and still provide safe charging under abnormal
conditions such as high ambient temperature, high input
voltage or low battery voltage. The IC is available in a 10-pin
MSOP thermally enhanced package featuring an exposed
bottom-side metal pad for soldering to the PC board.
Other features include:
• C/10 trickle charge for deeply discharged batteries
• Auto recharge when battery voltage drops below preset threshold
• Input power OK LED indicator (ACPR)
• C/10 charge LED indicator (CHRG)
• Fault LED indicator for “out of temp range” (FAULT)
Small surface mount components are used to minimize
board space and height with the circuitry occupying approximately 0.15 square inches of board space with a
height of 0.054 inches (1.4mm).
Table 1. Typical Demo Board Specifications
Input Voltage Range VIN
4.25V to 7V (Upper Range Limited
by PC Board Dissipation)
• 1A and 0.5A constant current selected by a jumper
Output Voltage VBAT (Constant
Voltage Mode)
4.2V ±1%
• Capable of charging directly from USB power
Output Current IBAT (Constant
Current Mode)
1A ±8%, 0.5A ±8% (Selected by
Jumper)
• 3-hour charge termination timer. This timer can be set
for other time periods through a capacitor change. For
instance, you may want to use a much shorter period
(on the order of 30 seconds) when evaluating the board
with a battery simulator instead of a real Li-Ion battery.
Current Monitor Output
1.5V ±5% at Full Current
Output Current IBAT (Trickle Current
Mode)
100mA ±20%, 50mA ±20%
C/10 CHRG LED Threshold Level
100mA ±20%, 50mA ±25%
Circuit Board Temperature in
Thermal Feedback Mode
60°C to 70°C
• Charge current monitor output can be used for gas
gauging
Trickle Charge Threshold Voltage
2.457V
Battery Drain Current with VIN
Removed
< 1µA
• Preset float voltage of 4.2V ±1%
• Manual shutdown
• Low battery drain current when input supply is removed
• No isolation diode or current sense resistor required
Design files for this circuit board are available at
http://www.linear.com/demo/DC705A
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.
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1
DEMO MANUAL DC705A
Quick Start Procedure
Setup
To save time, we recommend using a battery simulator
(described in Table 2 and Figure 1) If an actual rechargeable
Li-Ion battery is used, keep the DC resistance between the
charger and the battery to a minimum, as this will affect
the charge current in the constant voltage mode.
Refer to Table 2 and Figure 1 for equipment requirements
and proper setup.
Table 2. Test Equipment Required for Demo Board Evaluation
2.Set jumper JP2 to the lower position, which programs
the constant charge current to 1A.
Lab power supply for input power
0 to 7V, 1.2A
Digital voltmeter for measuring input
voltage (VIN)
3 1/2 digits
Digital voltmeter for measuring battery
voltage (VBAT)
4 1/2 digits, resolution to
1mV
Digital voltmeter for measuring PROG pin
voltage (current monitor)
3 1/2 digits, resolution to
1mV
Digital voltmeter for measuring voltage
across current sense resistor (IBAT)
100mV range
4.2V rechargeable Li-Ion cell or battery
simulator
600mA/Hr to 1.3A/Hr
1.Set jumper JP1 to the “RUN” position (lower position).
3.Set the input power supply to 0V, and then connect it
to the VIN and GND pins of the demo board.
4.Set the battery simulator to 0V, and then connect it to
the BAT and GND pins.
5.Connect the digital voltmeters as shown in the setup
diagram to measure VIN, V(current monitor), charge
voltage (VBAT) and the charge current (IBAT).
Battery Simulator Consists of:
Power supply with coarse and fine output
voltage adjust controls
0 to 5V, 2.5A
Power resistor (preload for power supply)
2Ω, 10W
Current sense resistor for measuring
charge current
0.1Ω, 1%, 1W
Current sense resistor for measuring
battery drain current
1k, 1%, 0.5W
2
dc705af
–
INPUT POWER
SUPPLY
0V TO 7V
1.5A
DO NOT
EXCEED 7V
+
–
+
Figure 1. Proper Measurement Equipment Setup
–
–
MONITOR
CHARGE
CURRENT
–
+
VBAT +
0.1Ω
1%
+
MEASURE
BATTERY
VOLTAGE
2Ω
10W
PRELOAD
MEASURE CHARGE CURRENT
DC705A F01
WITH COURSE
AND FINE
VOLTAGE
ADJUSTMENT
0V TO 4.3V
AT 2.5A
BATTERY
SIMULATOR
BENCH POWER
SUPPLY
DEMO MANUAL DC705A
Quick Start Procedure
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3
DEMO MANUAL DC705A
Quick Start Procedure
Evaluation
Constant Voltage Charge
Undervoltage Lockout Feature
1.Continue slowly increasing the battery simulator power
supply, thus simulating a battery accepting charge.
• Increase the input power supply to approximately 3.8V
(battery simulator power supply set for 0V).
The charger output voltage and charge current should
be 0V. All three LEDs should be off. The charger is in
shutdown due to the undervoltage lockout feature.
Trickle Charge Current
• Increase the input voltage to 5V and keep the battery
simulator power supply at 0V.
The CHRG and ACPR LEDs should now be on, and the
FAULT LED should be off. The charger output voltage
(VBAT) should be approximately 240mV, and the charge
current should be about 100mA (10mV on the charge
current DVM). This is the trickle charge mode for a
deeply discharged battery. Typically, a battery that has
not been charged for a long time.
Constant Current Charge
• Starting at 0V, slowly increase the battery simulator
power supply (VBAT), observing the charger’s output
voltage on the DVM.
When the charger’s output voltage exceeds approximately 2.45V, the charger will suddenly enter the constant current portion of the charge cycle, resulting in an
abrupt jump in the charge current to the programmed
value of approximately 1.0A (100mV on the charge
current DVM). This is constant current mode.
Move jumper JP2 to the upper position (0.5A) to reduce
the charge current (IBAT) to 500mA, resulting in a reading of approximately 50mV on the charge current DVM.
Move the jumper back to the original position.
VPROG Verification
• With 1.0A charge current flowing into the battery simulator, measure the current monitor pin voltage VPROG.
This voltage is proportional to charge current with 1.5V
indicating full programmed current (1.0A).
4
The charge current should remain at the programmed
value of 1.0A until the charger output voltage is within
approximately 10mV of the of the preset charge voltage, at which time the charge current will begin to decrease. This is the beginning of the constant voltage
portion of the charge cycle.
2.Continue slowly increasing the battery simulator power
supply until the charge current drops to approximately
200mA (20mV on the charge current DVM), then read
the charger output voltage. This reading is the charger
float voltage which should be 4.2V ±40mV.
Shutdown
1.Move the SHDN/CHRG jumper JP1 to the upper position.
This shuts the charger down dropping the charge current to 0mA. This is the shutdown mode.
2.Move the jumper back to the original location.
Charge LED, C/10 Charge Near Complete
• Continue to slowly increase the battery simulator power
supply while observing the CHRG LED. The LED will
go out when the charge current drops to approximately
10% of the programmed charge current of 1.0A. This
verifies that the C/10 output is operating correctly.
NOTE: The LED current drops from approximately 10mA
when the LED is on, to approximately 25µA when the
charge current drops to 10%, and drops to 0µA after
the timer has timed out. (3 hours when a 0.1µF timing
capacitor is used).
At C/10, when the CHRG LED goes out, the battery is
about 94% charged. The charger will continue charging
for 3 hours (0.1µF timing capacitor) then stop, at which
point the battery is 100% charged.
dc705af
DEMO MANUAL DC705A
Quick Start Procedure
Recharge
• After the timer has timed out, slowly decrease the
battery simulator power supply. At around 4.05V, the
1.0A charge current should return. This is the Recharge
Threshold Voltage.
NOTE: For evaluation purposes, the time can be decreased from the programmed 3 hours to approximately
30 seconds by reducing the timer capacitor (C3) from
0.1µF to 270pF.
Sleep Mode
• To verify battery drain current in the sleep mode, remove the input supply voltage or shut the supply off,
replace the 0.1Ω current sense resistor with a 1kΩ, and
set the battery simulator power supply to approximately
4V. The charge current DVM will now read battery drain
current with 1mV/µA.
NOTE: On this demo board, the thermistor (R6) is
replaced with a 10kΩ resistor. Because the board can
get quite hot, the thermistor must be located near the
battery, not on the PC board.
Thermal Control Loop
1.Increase the input voltage to about 6.5V, and reduce
the battery simulator power supply to around 3V.
This causes increased power dissipation, which raises
the LTC4053 junction temperature. When the junction
temperature reaches approximately 105°C, the charge
current decreases enough to maintain the junction
temperature at 105°C.
2.Increase the battery simulator voltage or reduce the input
voltage to reduce the charger power dissipation and
allow the charge current to return to the programmed
current of 1A.
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5
DEMO MANUAL DC705A
Parts List
ITEM
QTY
1
1
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
C1
CAP, X7R 4.7µF 10V 20% 0603
TDK C1608X5R0J475M
2
1
C2
CAP, X5R 1µF 6.3V 20% 0402
TDK C1005X5R0J105M
3
1
C3
CAP, X7R 0.1µF 16V 10% 0603
TAIYO YUDEN EMK107BJ104KA
4
1
D1
LED, RED
PANASONIC LN1251C-(TR)
5
1
D2
LED, GREEN
PANASONIC LN1351C-(TR)
6
1
D3
LED, AMBER
PANASONIC LN1451C-(TR)
7
4
E1, E2, E3, E4
TURRET
MILL-MAX 2501-2
8
3
E5, E6, E7
TURRET
TP\MMX\2308-2
9
2
JP2, JP1
HEADER, 3 PIN 2mm
COMM CON 2802S-03-G1
10
2
JP2, JP1
SHUNT, 2mm
COMM CON CCIJ2MM-138G
11
1
R1
RES, 1.50kΩ 1% 1/16W 0402
AAC CR05-1501FM
12
1
R2
RES, 4.12kΩ 1% 1/16W 0402
AAC CR05-4121FM
13
3
R3, R4, R5
RES, 330Ω 5% 1/16W 0402
AAC CR05-331JM
14
1
R6
RES, 10kΩ 5% 1/4W 1206
AAC CR18-103JM
15
1
R7
RES, 1Ω 5% 1/16W 0402
AAC CR05-1R0JM
16
1
R8
RES, 3.01kΩ 1% 1/16W 0402
CR05-3011FM
17
1
R9
RES, 47kΩ 5% 1/16W 0402
AAC CR05-473JM
18
1
U1
IC, LTC4053EMSE-4.2
LINEAR TECH. LTC4053EMSE-4.2
6
dc705af
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
4
E1
CURRENT
MONITOR
GND
E5
E2
4.25V - 6.3V
+VIN
5
0.5A
1A
2
4
3.01K
1.5K
JP2
R8
330
330
330
R1
R5
D3
AMB
R4
D2
GRN
R3
D1
RED
7
3
10
1
C1
4.7uF
6.3V
U1
NTC
47K
R9
SHDN
3
3
PROG
FAULT
R7
MEI
08/06/03
3
Wednesday, October 29, 2003
DESIGNER
ENGINEER
APPROVED
CHECKED
DRAWN
APPROVALS
DATE
1uF
CONTRACT NO.
C2
1
2
REV
PROTO
2
NTC
SHDN
09/24/03
DATE
1
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
Single
Li-lon Cell
TECHNOLOGY
GND
E3
BAT
4.2V
E4 0.5A/1A
E7
E6
DESCRIPTION
REVISION HISTORY
APPROVED
SCALE:
DWG NO
2
FILENAME: 705A-2.DSN
SIZE CAGE CODE
SHEET
DC705A
1
1
OF
1
2
REV
SCH, LTC4053EMSE-4.2, LI-ION BATTERY CHARGER
TITLE
R6
Thermistor
10K NTC
0.1uF
For 3 hrs
9
6
ECO
R2
4.12K
C3
BAT
ACPR LTC4053EMSE-4.2
CHRG
JP1
RUN
1
GND
5
This circuit is proprietary to Linear Technology and supplied
for use with Linear Technology parts.
Customer Notice:Linear Technology has made a best effort to
design a circuit that meets customer-supplied specifications;
however, it remains the customers 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
Applications Engineering for assistance.
1
3
2
VCC
2
8
SHDN
TIMER
4
5
A
B
C
D
DEMO MANUAL DC705A
Schematic Diagram
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7
DEMO MANUAL DC705A
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
8
dc705af
Linear Technology Corporation
LT 0415 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507 ● www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2015
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