1
dc1674abf
DEMO MANUAL DC1674A-B
DESCRIPTION
LTC4156EUFD
Dual Input Power Manager/3.5A LiFePO4
Battery Charger with I2C Control and USB OTG
Demonstration Circuit 1674A-B is dual input power
manager/3.5A LiFePO4 battery charger with I2C control
and USB On-The-Go (OTG).
The dual input multiplexer, overvoltage protection (OVP)
and reverse voltage protection (RVP) is implemented with
external N-channel MOSFETs.
An on board buck regulator generates the VOUT voltage
from the active input voltage. This voltage is regulated to
minimize the dissipation in the battery charger. The mini-
mum voltage of the VOUT regulator is 3.2V to provide an
instant-on function when the battery is fully discharged. L, LT, LTC, LTM, μModule, Linear Technology and the Linear logo are registered trademarks
and QuikEval is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
PERFORMANCE SUMMARY
Most functions on the LTC
®
4156EUFD are controlled via
the I2C serial interface. The LTC4156EUFD also provides
extensive status information via the I2C serial interface.
Please refer to the LTC4156EUFD data sheet for details
about the I2C serial interface, control and status registers,
and the electrical and timing specifications.
The LTC4156EUFD does modify several of its own control
registers to reflect the current operating conditions.
Design files for this circuit board are available at
http://www.linear.com/demo
(TA = 25°C)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VWALL WALL Input Voltage Range 4.35 5 5.5 V
IWALL Input Current from WALL Input 4.35V < VWALL < 6V 0 0.1 3 A
VUSB USB Input Voltage Range 4.35 5 5.5 V
IUSB Input Current from USB Input 4.35V < VUSB < 6V 0 0.1 3 A
VOUT Voltage on the VOUT Pin 0A < IVOUT ≤ 4A, 2.7V < VBAT ≤ 3.8V 3.19 3.5 4.6 V
IVOUT Output Current from VOUT Total Load Current Including Battery Charger 4.5 A
VBAT Voltage on the BAT Pin 3.3 3.6 V
IBAT BAT Pin Source or Sink Current –4 3 A
VWALL,USB Input Voltage Range, Non-Operating 5.75 27 V
I2C Controlled High Power Battery Charger/USB Power Manager
VBUS
VIN
CLPROG1CLPROG2 PROG VCOVGCAP
IRQI2C GND
2
3.6k 100k
ID
USBGT
CHGSNS
USBSNS
1.21k 499Ω 47nF
10μF
0.1μF
22μF
NTC
BATSNS
BATGATE
NTCBIAS
WALLGT
LTC4156
WALLSNS
VOUT
SW
TO
SYSTEM
LOAD
1μH
dc1674ab TA01a
LOAD CURRENT (A)
0
0
EFFICIENCY (%)
10
30
40
50
100
70
1.0 2.0 2.5
DC1674ab TA01b
20
80
90
60
0.5 1.5 3.0
VBAT = 3.3V
Switching Regulator Efficiency
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dc1674abf
DEMO MANUAL DC1674A-B
Figure 1. Proper Measurement Equipment Setup
DC1674A-B working input voltage range is 4.35V to5.5V
on both the WALL and USB input. The DC1674A-B will
tolerate non-operating overvoltage inputs up to 27V.
DC1674A-B utilizes the DC590B, USB to I2C interface
board, to control the LTC4156EUFD and to read back the
contents of the command and status registers.
The DC1674A-B is easy to set up to evaluate the perfor-
mance of the LTC4156EUFD. Refer to Figure 1 and Figure2
for proper measurement equipment setup and follow the
evaluation procedure below using the DC590B board.
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.
Figure 2. Measuring Input or Output Ripple
QUICK START PROCEDURE
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dc1674abf
DEMO MANUAL DC1674A-B
QUICK START PROCEDURE
1. Ensure that JP1 and JP2 are in their default positions,
as shown in Figure 1. Set PS3 to 3.6V and turn on. The
DVCC voltage level may be selected on the DC590B.
This is done by setting the VCCIO jumper, JP6, on the
DC590B board to one of the following settings: 3.3V,
5V, removed for 2.7V or set to external if an external
supply is desired to be used. Please set DVCC to 3.3V.
2. Start the Linear Technology QuickEval™ program.
Download and install the latest version of the QuikEval
program from the following weblink: http://www.linear.
com/designtools/software/. This program should au-
tomatically detect the presence of the LTC4156EUFD
demo board (DC1674A-B) and activate the appropriate
GUI, as seen in Figure 3.
3. Set PS1 to 5V, and turn on. The “WALL Input Power
Available” and “External Power Available” indicators on
the GUI should turn green. The current on PS1 should
indicate approximately 80mA.
4. Set “WALL ILIM” to 3000mA. To compensate for the
sense resistance of IM1, adjust PS3 such that VM3
reads 3.6V. PS1 should now read approximately 2A,
and IM1 should read approximately 2.4A.
5. Set PS2 to 5V, and turn on. The only change should
be the “USB Input Power Available” indicator should
turn green.
6. Set the “USB ILIM” to 3000mA, and select the USB Input
radio button in the “Input Power Priority” frame. PS1
should now read 0A, PS2 should read approximately
2A, and IM1 should be unchanged at 2.4A
7. Set LD1 to 1A, and turn on. PS2 should now read ap-
proximately 3A, and IM1 should be unchanged.
8. Set “ICHARGE%” to 50%. PS2 should now read ap-
proximately 2A, and IM1 should be 1.2A.
9. Turn off and disconnect PS1, VM1, and PS2.
10. Select the “Force OTG Boost On” radio button. VM2
should now read approximately 5V.
USING THE LTC4156EUFD SOFTWARE
Introduction
The DC1674A-B GUI provides control of most aspects
of operation of the LTC4156EUFD. The DC1674A-B GUI
continuously reads back the LTC4156EUFD registers and
updates the displayed status accordingly. The DC1674A-B
GUI also provides a means to change the value of the
CLPROGx and PROG resistors, as well as the β of the NTC
device. The user is responsible for ensuring that these
values match the values on the physical Demo Board.
The DC1674A-B GUI will remember these values from
session to session, and they can be reset to the default
values at any time.
The DC1674A-B GUI is composed of three forms, the
LTC4156 form (Figure 3) that is brought up by the Quick-
Eval program, the Manage Current Limit Resistors form
(Figure4), that is brought up by pressing the “Change
Resistors” button on the LTC4156 form, and the Manage
β Value form (Figure 5) that is brought up by pressing the
“Change β” button on the LTC4156 form.
Any changes made in the Manage Current Limit Resistors
or Manage β Value forms will be reflected on the main form
as soon as “Apply” is pressed. All changes made in these
two forms will be remembered from session to session.
The values can be set to default at any time.
View LTC4156EUFD Product Page
This button opens your default internet browser, and
searches the Linear Technology Corporation web site for
information on the LTC4156EUFD when an internet con-
nection is available.
WALL and USB ILIM Sections
These sections allow control over the WALL and USB
input current limit.
These sections should default to 100mA at power-up,
when the USB/USER (JP1) is in the “USB” position. They
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dc1674abf
DEMO MANUAL DC1674A-B
QUICK START PROCEDURE
should both default to the 1000mA value at the top of
the frame, at power-up, with the USB/USER (JP1) in the
“USER” position.
If the USB input power becomes unavailable, the USB ILIM
section will return to 100mA.
ICHARGE% Section
This section controls the battery charging current as a
percent of maximum. The maximum is shown at the top
of the frame, and is calculated from the displayed PROG
resistor value.
C/x Set
Select the End of Charging condition. This selects the
current, as a percent of the maximum that indicates end
of charging. Optionally, charging may also be terminated
at the C/x current threshold by selecting the “4hr or C/x”
timer mode.
Timer
This selects the timeout for the charging timer. When
the end of charging condition is reached, the charger is
not turned off, but the timer is started, and when it times
out, the charger is turned off. The exception is “4hr or
C/x” mode, where whichever 4hrs or C/x, occurs first will
terminate charging.
VFLOAT
This selects the desired battery float voltage, and defaults
to 3.45V.
Input Power Priority
By default, the WALL input has priority on the input power
multiplexer. The priority can be reassigned to USB input
by selecting the appropriate radio button.
OTG Boost Automatic Enable
Selectes whether or not the ID pin of the USB connector
enables USB On-The-Go (OTG) operation. It may be desir-
able to control USB OTG directly, without the need to set
the USB connector ID pin voltage level below VID_OTG. To
control USB OTG directly, check the “Force OTG Boost
On” box. Automatic enable has no effect on ID pin status
indication.
Disable Input UVCL
As the active input voltage (USB or WALL) drops below
4.3V, the LTC4156EUFD will lower the input current limit to
attempt to prevent the input voltage from drooping lower.
This is a useful feature in the input supply voltage is not
very stiff, or if there is significant impedance between the
input supply and the LTC4156EUFD. If this function is not
desired, check the “Disable Input UVCL” box.
Interrupts
The LTC4156EUFD can monitor a variety of conditions,
which it reports over the I2C buss. By selecting the check
boxes in the Interrupt section, the LTC4156EUFD can also
issue interrupts whenever one of these conditions changes.
The presence of an interrupt is indicated by the indicator
changing to red and displaying “Interrupt Pending.” The
interrupt can be cleared by pressing the “Clear Interrupt”
button. Changing the interrupt mask also clears all pend-
ing interrupts.
5
dc1674abf
DEMO MANUAL DC1674A-B
QUICK START PROCEDURE
Figure 4. Manage Current Limit Resistors Form
Figure 3. LTC4156 Main Form
Figure 5. Manage β Value Form
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dc1674abf
DEMO MANUAL DC1674A-B
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 2 C1, C2 Capacitor, Chip, X5R, 22μF, ±10%, 25V, 1210 Murata, GRM32ER61E226KE15L
2 3 C3, C11, C12 Capacitor, Chip, X5R, 22μF, ±20%, 6.3V, 0805 TAIYO-YUDEN, JMK212BJ226MG
3 1 C5 Capacitor, Chip, X7R, 0.01μF, ±10%, 25V, 0402 TDK, C1005X7R1E103K
4 1 C9 Capacitor, Chip, X7R, 0.047μF, ±10%, 25V, 0402 TDK, C1005X7R1E473K
5 1 C10 Capacitor, Chip, X5R, 100μF, ±20%, 6.3V, 1210 Murata, GRM32ER60J107ME20L
61L1 Inductor, SMT, 1μH, 10.8mΩ, ±20%, 4mm × 4mm Coilcraft, XFL4020-102ME
7 2 M1-M2 MOSFET, 40V, 25mΩ, 12A, Power33 Fairchild, FDMC8030
8 1 M3 MOSFET, –20V, 22mΩ, 12A, Power PAK ChipFET Single Vishay, Si5481DU-T1-GE3
9 1 Q1, Q2 Dual NPN, SOT363 Diodes/Zetex, MMDT3904-7-F
10 2 R1, R5 Resistor, Chip, 1MΩ, ±5%, 1/16W, 0402 Vishay, CRCW04021M00JNED
11 2 R2, R6 Resistor, Chip, 3.6k, ±5%, 1/8W, 0805 Vishay, CRCW08053K60JNED
12 2 R3, R4 Resistor, Chip, 47k, ±5%, 1/16W, 0402 Vishay, CRCW040247K0JNED
13 2 R13, R17 Resistor, Chip, 100k, ±1%, 1/16W, 0402 Vishay, CRCW0402100KFKED
14 2 R14, R15 Resistor, Chip, 1.21k, ±1%, 1/16W, 0402 Vishay, CRCW04021K21FKED
15 1 R16 Resistor, Chip, 499Ω, ±1%, 1/16W, 0402 Vishay, CRCW0402499RFKED
16 4 R18, R19, R22, R23 Resistor, Chip, 0Ω Jumper, 1/16W, 0402 Vishay, CRCW04020000Z0ED
17 1 U1 (ASSEMBLY - A)
U1 (ASSEMBLY - B)
Dual Input Power Manager/3.5A Li-Ion Battery Charger
with I2C Control and USB OTG
Linear Technology, LTC4155EUFD
Linear Technology, LTC4156EUFD
Additional Demo Board Circuit Components
1 1 C4 Capacitor, Chip, X7R, 4.7μF, ±10%, 50V, 1206 Murata, GRM31CR71H475KA12L
2 1 C6 Capacitor, Chip, X7R, 0.01μF, ±10%, 25V, 0402 TDK, C1005X7R1E103K
3 1 C7 Capacitor, Chip, X5R, 0.1μF, ±10%, 25V, 0402 TDK, C1005X5R1E104K
4 0 C8-OPT Capacitor, Chip, TBD, 0402 User Defined
5 0 C13-OPT Capacitor, Chip, X5R, 22μF, ±10%, 25V, 1210 Murata, GRM32ER61E226KE15L
6 1 D1 LED, Red, 0603 Panasonic, LNJ208R8ARA
7 1 R7 Resistor, Chip, 1.0Ω, ±5%, 1/16W, 0402 Vishay, CRCW04021R00JNED
8 1 R8 Resistor, Chip, 100k, ±1%, 1/16W, 0402 Vishay, CRCW0402100KFKED
9 1 R9 Resistor, Chip, 0Ω Jumper, 1/16W, 0402 Vishay, CRCW04020000Z0ED
10 2 R10, R11 Resistor, Chip, 5.1k, ±5%, 1/16W, 0402 Vishay, CRCW04025K10JNED
11 1 R12 Resistor, Chip, 51k, ±5%, 1/16W, 0402 Vishay, CRCW040251K0JNED
12 1 R20 Resistor, Chip, 1k, ±5%, 1/10W, 0603 Vishay, CRCW06031K00JNED
13 0 R21-OPT Resistor, Chip, TBD, 0402 User Defined
14 1 U2 I2C EEPROM Microchip, 24LC025-I/ST
Hardware/Components (For Demo Board Only)
1 8 E1, E2, E3, E4, E11, E13, E14, E15 Turret, 0.09 DIA Mill-Max, 2501-2-00-80-00-00-07-0
2 7 E5, E6, E7, E8, E9, E10, E12 Turret, 0.061 DIA Mill-Max, 2308-2-00-80-00-00-07-0
3 1 J1 Connector, USB Micro-B Tyco, 1981568-1
41J2 Header, 2 × 7 Pin, 0.079CC Molex, 87831-1420
5 0 J3-OPT Connector, Battery Hirose, DF3-3P-2DSA
6 2 JP1, JP2 Header, 3-Pin 1 Row 0.079CC Samtec, TMM-103-02-L-S
7 2 JP1, JP2 Shunt, 2mm Samtec, 2SN-KB-G
8 4 Stand-Off, Nylon, 0.375” Tall (Snap On) Keystone, 8832 (SNAP ON)
9 1 FAB, Printed Circuit Board Demo Circuit 1674A
10 2 Stencil - Top & Bottom DC1674A-2
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dc1674abf
DEMO MANUAL DC1674A-B
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
OPT
NOTES: UNLESS OTHERWISE SPECIFIED
1. RESISTORS: OHMS, 0402, 1%, 1/16W
2. CAPACITORS: uF, 0402, 10%, 50V
*
OPT
4A
-
INTERRUPT
PENDING
4A
VFLOAT = 4.05V,
4.1V, 4.15V, 4.2V
LTC4156EUFD
NON - OPERATING FAULT TOLERANCE TO
+ / - 27V CONTINUOUS.
U1.7,9,10 : LEAKAGE CURRENT
MUST BE < 400nA
LTC4155EUFD
OPT
3.5V - 4.5V
U1
USB
NTC
- B
LEAKAGE CURRENT MUST BE < 50nA
INPUT CURRENT
- A
USER
ASSY
*
INT EXT
OPT
DC590
INTERFACE
4.35V - 5.5V
4.35V - 5.5V
NON - OPERATING FAULT TOLERANCE TO
+ / - 27V CONTINUOUS.
2
DEMO CIRCUIT 1674A-A/B
11
DUAL INPUT POWER MANAGER / 3.5A Li-Ion
N/A
LTC4155EUFD / LTC4156EUFD
NC
GEORGE B.
BATTERY CHARGER WITH I2C CONTROL AND USB OTG
05-05-11
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 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
GEORGE B.PRODUCTION FAB
205-05-11
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
DVCC
DVCC
C9
0.047μF
25V
J1
MICRO-B
VBUS
D-
D+
ID
GND
GND
GND
GND
GND
GND
GND
Q1A
MMDT3904
R14
1.21k
R19
0
JP2
1
2
3
R5
1Meg
5%
E1
WALL
C5
0.01μF
25V
R11
5.1k
5%
C13
22uF
1210
25V
20%
TP10
BATGATE
TP5
WALLGT
E2
GND
E8
CLPROG2
Q2B
MMDT3904
TP9
VC 100uF
6.3V
1210
C10
20%
E10
IRQ
TP1
D+
E6
NTC
C3
22uF
0805
6.3V
20%
R6
3.6k
5%
0805
C11
22uF
0805
6.3V
20%
M2B
FDMC8030
U2
24LC025I/ST
256X8
1
6
3
4
5
2
7
8
A0
SCLK
A2
VSS
SDA
A1
WP
VCC
M3
Si5481DU
R18
0
C4
4.7uF
1206
50V
R3
47k
5%
E3
USB
E15
VOUT
L1
1.0μH
XFL4020-102ME
R10
5.1k
5%
C12
22uF
0805
6.3V
20%
M1A
FDMC8030
TP15
SDA
TP8
OVGCAP
TP6
USBGT
JP1
1
2
3
Q2A
MMDT3904
C2
22uF
1210
25V
R7
1.0
5%
C8
TBD
25V
TP16
SCL
TP7
USBSNS
D1
RED
LNJ208R8ARA
R21
TBD
TP14
DVCC
R9
0
C1
22uF
1210
25V
R17
100k
R8
100k
R15
1.21k
R4
47k
5%
C7
0.1μF
25V
E13
BAT
TP2
D-
R13
100k
M1B
FDMC8030
M2A
FDMC8030
TP13
VOUTSNS
J2
1
3
5
7
9
11
13
2
4
6
8
10
12
14
+
+
+
+
+
+
+
+
+
+
+
+
+
+
R22
0
E14
GND
R2
3.6k
5%
0805
R16
499
E12
BATSNS
C6
0.01uF
25V
TP12
VBUS
TP3
ID
R1
1Meg
5%
E4
GND
R20
1k
5%
0603
R23
0
E7
CLPROG1
J3
DF3-3P-2DSA
1
2
3
BAT
GND
NTC
U1
24
29
20
15
2
28
1
18
5
13
16
4
19
3
6
26
22
27
17
21
2523
14
7
8
9
10
11
12
VBUS
GND
CHGSNS
NTC
DVCC
SCL
SDA
PROG
CLPROG1
VOUTSNS
BATSNS
ID
CHGSNS
IRQ
CLPROG2
SW
VOUT
SW
BATGATE
VOUT
VBUSVBUS
NTCBIAS
WALLSNS
USBSNS
USBGT
OVGCAP
WALLGT
VC
Q1B
MMDT3904
R12
51k
5%
E5
NTCBIAS
TP11
SW
E11
GND
TP4
WALLSNS
E9
PROG
8
dc1674abf
DEMO MANUAL DC1674A-B
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2012
LT 0312 • 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
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 applica-
tion engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation
