EV2731-QC-00A
2
Wide-Input, 4.5A, I C-Controlled SW Charger
w/ NVDC Power Path and USB OTG Eval Board
DESCRIPTION
FEATURES
The EV2731-QC-00A is an evaluation board for
designed to demonstrate the capabilities of the
MP2731. The MP2731 is a wide-input, 4.5A,
highly integrated switch-mode battery charger
IC for single-cell Li-ion or Li-polymer batteries.
This device supports NVDC architecture with
power path management suitable for portable
applications including tablets, mobile internet
devices, and smartphones.
Its low-impedance power path optimizes
efficiency, reduces battery charging time, and
extends battery life. The I2C serial interface with
charging and system settings allows the device
to be flexibly controlled.
The EV2731-QC-00A supports up to 16V input
sources, including standard USB host ports and
high-voltage wall adapters with fast-charge
capability. The EV2731-QC-00A supports USB
On-the-Go (OTG) operation by supplying 5V
with 3.0A.
ELECTRICAL SPECIFICATIONS
Parameter
Input voltage
Charge full
voltage
Charge current
Input voltage
regulation
Input current
limit
Value
Units
VIN
3.7 to 16
V
ICC
VIN_MIN
IIN_LIM
4.2,
I2C-configurable
1.84,
I2C-configurable
4.3,
I2C-configurable
0.5,
I2C-configurable
Symbol
VBATT_REG
V
A
V
A
OTG voltage
regulation
VIN_DSCHG
5.0,
I2C-configurable
V
OTG current
limit
IIN_DSCHG
0.5,
I2C-configurable
A
3.7V to 16V Operating Input Voltage Range
Up to 22V Sustainable Voltage
High Efficiency 1.35MHz 4.5A Buck Charger
o Programmable D+/D- for Flexible Fast
Charge Protocol Support
o Adjustable Minimum Input Voltage
Regulation for MPPT
USB OTG with 4.8V to 5.5V Adjustable
Output, Selectable 1.35MHz Boost
Converter, Up to 3.0A Output
Up to 9A Battery Discharge Current
Integrated ADC for Monitoring VIN, IIN, VBATT,
IBATT, VSYS, and Battery Temperature
Narrow Voltage DC (NVDC) Power Path
Management
o Instant-On Works with No Battery or
Deeply Discharged Battery
o Ideal Diode Operation in Battery
Supplement Mode
I2C Port for Flexible System Parameter
Setting and Status Reporting
Full DISC Control to Support Shipping Mode
and System Restart
High Accuracy:
o ±0.5% Charge Voltage Regulation
o ±5% Charge Current Regulation
o ±5% Input Current Regulation
o ±2% Output Regulation in Boost Mode
Safety Features:
o Programmable JEITA for Battery Temp
Protection
o Battery Charging Safety Timer
o Thermal Regulation and Shutdown
o Input/System Over-Voltage Protection
o Supports Temp Protection in Battery
Side
Charging Operation Indicator
APPLICATIONS
Tablet PCs
Smartphones
Mobile Internet Devices
All MPS parts are lead-free, halogen-free, and adhere to the RoHS
directive. For MPS green status, please visit the MPS website under
Quality Assurance. “MPS”, the MPS logo, and “Simple, Easy Solutions” are
registered trademarks of Monolithic Power Systems, Inc. or its subsidiaries.
EV2731-QC-00A Rev.1.0
www.MonolithicPower.com
4/29/2020
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2020 MPS. All Rights Reserved.
1
EV2731-QC-00A – WIDE INPUT, 4.5A, I2C SWITCHING CHARGER EVAL BOARD
EV2731-QC-00A EVALUATION BOARD
Efficiency Curve
VIN = 5V/9V/12V/16V, VBATT = 3.8V, RL_DCR = 21mΩ
98
96
EFFICIENCY (%)
94
92
90
88
86
VIN=5V
84
VIN=9V
82
VIN=12V
80
VIN=16V
78
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
IBATT (A)
(LxWxH) 6.3cmx6.3cmx1.3cm
Board Number
MPS IC Number
EV2731-QC-00A
MP2731GQC
EV2731-QC-00A Rev.1.0
www.MonolithicPower.com
4/29/2020
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© 2020 MPS. All Rights Reserved.
2
EV2731-QC-00A – WIDE INPUT, 4.5A, I2C SWITCHING CHARGER EVAL BOARD
QUICK START GUIDE
Table 1: Jumper Connections
Jack
Description
Factory Setting
JP3
JP2
JP1
P1
OTG pin setting: pull high to enable the OTG
CE pin setting: pull low to enable the charge
NTC pin setting: pull low to set the NTC to the fix ratio: 50%
I2C connector
Pull low
Pull low
Pull low
The EV2731-QC-00A evaluation board is designed for the MP2731 when used as a standalone
switching charger with integrated USB detection and USB On-the-Go function. Its layout
accommodates most commonly used capacitors. The default function of this board is preset for charger
mode, and the charge-full voltage is preset to 4.2V for a single-cell Li-ion battery.
For a detailed description of the operation of this part, refer to the MP2731 datasheet. Visit the MPS
website to access the “MP2731 Evaluation Kit” .exe file.
Evaluation Platform Preparation
1. Ensure a computer is available with at least one USB port and a USB cable. The MP2731
evaluation software must be properly installed.
2. Prepare the USB-to-I2C communication interface (EVKT-USBI2C-02).
Figure 1: USB to I2C Communication Interface
3. Software: Double-click on the “MP2731 Evaluation Kit” .exe file to run the MP2731 evaluation
software. The software supports the Windows XP, Windows 7, and later operating systems. The
MP2731 evaluation kit .exe file can be downloaded from MPS Website by searching for “MP2731”.
EV2731-QC-00A Rev.1.0
www.MonolithicPower.com
4/29/2020
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© 2020 MPS. All Rights Reserved.
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EV2731-QC-00A – WIDE INPUT, 4.5A, I2C SWITCHING CHARGER EVAL BOARD
4. Configure the test set-up for the MP2731 (see Figure 2).
EV2731-QC-00A
VIN
DC
Power
Supply
BATT
1-Cell
Battery Pack
or Simulator
MAIN CIRCUIT
GND
U1
GND
GND
LED1
PC
MPS
PMBUS-kit
NTC_Bat
I2 C
USB to I2C
H
SCL
CE
H
OTG
System Load
H
GND
L
SDA
L
JP1
GND
DISC
INT
NTC
SYS
L
JP2
JP3
VREF NTC_Bat CE
OTG
GND
P1
Figure 2: Test Set-Up for the MP2731
5. Turn on the computer, and launch the MP2731 evaluation software. Figure 3 shows the main
window of the GUI software.
Figure 3: MP2731 Evaluation Software
EV2731-QC-00A Rev.1.0
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EV2731-QC-00A – WIDE INPUT, 4.5A, I2C SWITCHING CHARGER EVAL BOARD
Procedure
1. Ensure that all the connections are normal (the USB is connected and the EV2731-QC-00A is
connected). If all these connections are good, this will be indicated in green in the lower-left side of
the window (see Figure 3). Now the user can run the program.
2. Select the operation mode for the MP2731 (see Figure 4).
Figure 4: MP2731 GUI Operation Mode
3. Set the charging parameters (see Figure 5).
Figure 5: MP2731 GUI Charging Parameters Display
4. Set the input voltage regulation threshold (see Figure 6). Its range is 3.7V to 15.2V, and the default
value is 4.3V. Set it according to the VBATT_REG setting. For example, if VBATT_REG is set to 4.35V, this
value is recommended to be set to 4.6V or higher.
Figure 6: Input Voltage Regulation Threshold Setting
EV2731-QC-00A Rev. 1.0
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© 2020 MPS. All Rights Reserved.
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EV2731-QC-00A – WIDE INPUT, 4.5A, I2C SWITCHING CHARGER EVAL BOARD
5. Set the input current limit (see Figure 7). Its range is 100mA to 3250mA, and the default value is
500mA. Set it to the value that meets the input source capacity.
Figure 7: Input Current Limit Setting
The input current limit can be set lower than the maximum current rating of the input source. When
the input current reaches its set limit, the charge current is decreased to keep the input current
constant at this limit in order to safely power the system.
6. Set the constant charge current (see Figure 8). Its range is 320mA to 4520mA, and the default
charge current is set at 1840mA. The real charge current is limited as the input current limit setting.
Figure 8: Constant Charge Current Setting
EV2731-QC-00A Rev1.0
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4/29/2020
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© 2020 MPS. All Rights Reserved.
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EV2731-QC-00A – WIDE INPUT, 4.5A, I2C SWITCHING CHARGER EVAL BOARD
7. Set the pre-charge current (see Figure 9). Its range is 150mA to 750mA, and the default value is
230mA.
Figure 9: Pre-Charge Current Setting
8. Set the terminal charge current (see Figure 10). Its range is 100mA to 700mA, and the default value
is 180mA.
Figure 10: Terminal Charge Current Setting
9. Set the charge-full voltage (see Figure 11). Its range is 3.4V to 4.67V, and the default value is 4.2V.
Figure 11: Charge-Full Voltage Setting
EV2731-QC-00A Rev1.0
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EV2731-QC-00A – WIDE INPUT, 4.5A, I2C SWITCHING CHARGER EVAL BOARD
10. Set pre-charge to constant current charge threshold voltage (see Figure 12). Its options are 2.8V or
3.0V, and the default value is 3.0V.
Figure 12: VBATT_PRE Setting
11. Set the battery auto-recharge voltage to VBATT_REG minus the setting value (see Figure 13). Its
options are 100mV or 200mV, and the default value is 100mV.
Figure 13: VRECH Setting
12. Set the voltage variation between SYS regulation voltage and VSYS_MIN (see Figure 14). Its options
are 100mV or 150mV, and the default value is 150mV.
Figure 14: VTRACK Setting
13. Set the VSYS_MIN voltage threshold (see Figure 15). Its range is 3V to 3.75V, and the default value is
3.6V.
Figure 15: VSYS_MIN Setting
14. Set the switching frequency (see Figure 16). Its range is 1.35MHz or 1MHz, and the default value is
1.35MHz.
Figure 16: Switching Frequency Setting
EV2731-QC-00A Rev1.0
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EV2731-QC-00A – WIDE INPUT, 4.5A, I2C SWITCHING CHARGER EVAL BOARD
15. Set the NTC functions according to the selected NTC thermistor and requirements (see Figure 17).
If this function is not included during the evaluation, leave the default settings.
Figure 17: NTC Functions Settings
16. Set the thermal regulation threshold (see Figure 18) Its range is 60°C to 120°C, and the default
value is 120°C.
Figure 18: Thermal Regulation Threshold Setting
17. Select the termination setting (see Figure 19).
Figure 19: Termination Setting
18. Set charge timer (see Figure 20). Its range is 5hrs to 20hrs, and the default value is 12hrs.
Figure 20: Charge Timer Setting
The integrated charge timer provides backup protection to prevent a damaged battery from being
charged after a certain time. The MP2731 can disable the timer function by switching off the
EN_TIMER button (see Figure 20).
EV2731-QC-00A Rev1.0
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4/29/2020
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© 2020 MPS. All Rights Reserved.
9
EV2731-QC-00A – WIDE INPUT, 4.5A, I2C SWITCHING CHARGER EVAL BOARD
Boost Function
When the MP2731 is programmed to On-the-Go (OTG) mode, the output voltage and current limit can
be controlled via the I2C.
1. Turn off and disconnect the power from VIN to PGND.
2. If the constant voltage load connected from BATT+ to GND is not a four-quadrant supply (source
current), remove the load and use the power source disconnected in step 1. Then set a 4.0V
voltage limit and 3.5A current limit with a connection between BATT+ and PGND.
3. Apply a resistor (5W or greater, R = 3Ω to 10Ω) across VIN(+) to PGND(–).
4. Pull JP3 to high, and select OTG from the Charge Enable Control menu (see Figure 21).
Figure 21: Charge Enable Control Menu
5. Set the OTG output voltage regulation (see Figure 22). Its range is 4.8V to 5.5V, and the default
value is 5.0V.
Figure 22: OTG Output Voltage Regulation Setting
6. Set the OTG current limit (see Figure 23). Its range is 0.5A to 3.0A, and the default value is 0.5A.
Figure 23: OTG Current Limit Setting
EV2731-QC-00A Rev1.0
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4/29/2020
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© 2020 MPS. All Rights Reserved.
10
EV2731-QC-00A – WIDE INPUT, 4.5A, I2C SWITCHING CHARGER EVAL BOARD
Other Controls
The MP2731 evaluation software offers other controls as well. Other controls include:
Shipping mode control (see Figure 24)
Figure 24: Shipping Mode Control
Watchdog control (see Figure 25)
Figure 25: Watchdog Control
A register auto-monitor function (see Figure 26)
Figure 26: Register Auto-Monitor
ADC configuration (see Figure 27)
Figure 27: ADC Configuration
EV2731-QC-00A Rev. 1.0
www.MonolithicPower.com
4/29/2020
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© 2020 MPS. All Rights Reserved.
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EV2731-QC-00A – WIDE INPUT, 4.5A, I2C SWITCHING CHARGER EVAL BOARD
Fast charge protocol control (see Figure 28)
Figure 28: Fast Charge Protocol Setting
MP2731 operation status monitoring (see Figure 29)
Figure 29: Operation Status Display
MP2731 fault monitoring (see Figure 30)
Figure 30: Fault Monitoring Indicator Display
And others (see Figure 31)
Figure 31: Other Controls
EV2731-QC-00A Rev1.0
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4/29/2020
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© 2020 MPS. All Rights Reserved.
12
EV2731-QC-00A – WIDE INPUT, 4.5A, I2C SWITCHING CHARGER EVAL BOARD
EVALUATION BOARD SCHEMATIC (1)
CE
OTG
JP 2
V IN
C4
D2
DD+
ID
GN D
TP 3-D M
3
IN
C3
NC
DM
DP
5
V REF
B ST
5,6,7
TP 2-PGN D
1,26
TP 4-D P
4
PM I D
2
TP 1-V IN
2
25
V REF
13,14
R6
8
TP 7-B ST
0
PGN D
DP
SW
U1
DM
SY S
4
16
SW
SY S
MP 273 1
10
19,20
1
2
3
4
SD A 5
6
7
8
9
10
21
IN T
V N TC
SCL
SD A
L1
SY S
N TC
ST A T
TP 10-V SY S
R7
NC
C8
TP 11-PGN D
B A TT
TP 12-V BA TT
C 10
12
11
R T1
9 TP 9-ST A T
LE D 1
TP 6-IL IM
k
C6
NC
PGND
R T2
N TC _B at
JP 1
D I SC
2
4
3
S W1
V BA TT
C 11
NC
VREF
N TC
R1
2
1
PGND
V REF
CE
CE
k
R ILIM
1k
P1
V SYS
C9
NC
C7
17
CE
SD A
D1
NC
NC
24
SCL
B A TT
A GN D
IN T
k
OTG
D I SC
18
C5
47nF
TP 8-SW
15
23
CE
IL I M
R2
V REF
OTG
22
U SB
R4
100 k
3
NC
U2
1
R3
100 k
2
C2
PGND
V BUS
JP 3
TP 5-V PMID
1
V IN
N TC
N TC _B at
N TC_ B at
V REF
AGND
D IS C
O TG
IN T
D IS C
OTG
IN T
R5
100 k
VREF
Note:
1)
For SYS capacitor C8, a 22µF X5R/X7R capacitor with 1206 package is recommended for better performance.
EV2731-QC-00A Rev. 1.0
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4/29/2020
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© 2020 MPS. All Rights Reserved.
13
EV2731-QC-00A – WIDE INPUT, 4.5A, I2C SWITCHING CHARGER EVAL BOARD
EV2731-QC-00A BILL OF MATERIALS
Qty
Ref
Value
1
C1
1μF
1
C2
10μF
1
C3
NC
1
C4
10μF
1
C5
47nF
2
C6, C7
NC
2
C8, C10
22μF
2
C9, C11
NC
2
D1, D2
NC
1
L1
1.0μH
1
LED1
2
Description
Package
Manufacturer
Manufacturer PN
0603
muRata
GRM188R71E105KA12D
1206
muRata
GRM31CR61H106KA12L
1206
muRata
0603
muRata
GRM188R61C106KAALD
0603
muRata
GRM188R71H473KA61D
0603
muRata
1206
muRata
0805
muRata
SMA
HQ
Inductor, 1.0µH
SMD
Cyntec
Red
BL-HUF35A-TRB
0805
Bright LED
BL-HUF35A-TRB
R1, R2
2kΩ
Film Resistor, 1%
0603
Yageo
RC0603FR-072KL
3
R3, R4, R5
100kΩ
Film Resistor, 5%
0603
Yageo
RC0603JR-07100KL
1
R6
0Ω
Film Resistor, 1%
0603
Yageo
RC0603FR-070RL
1
R7
NC
Film Resistor, 1%
0603
Yageo
1
RILIM
1kΩ
Film Resistor, 1%
0603
Yageo
RC0603FR-071KL
2
RT1, RT2
10kΩ
0603
Yageo
RC0603FR-0710KL
1
SW1
3
JP1, JP2, JP3
3
JP1, JP2, JP3
1
P1
Film Resistor, 1%
Button, SM
4mmx10mm, 1.5mm
height
2.54mm connector
2.54mm connector,
shorter
Header, 5-pin, dual
row
Ceramic capacitor,
25V, X7R, 0603
Ceramic capacitor,
50V, X5R, 1206
Ceramic capacitor,
50V, X5R, 1206
Ceramic capacitor,
16V, X5R, 0603
Ceramic capacitor,
50V, X7R, 0603
Ceramic capacitor,
16V, X5R, 0603
Ceramic capacitor,
16V, X5R, 1206
Ceramic capacitor,
16V, X5R, 0805
Diode, 50V, 3A
GRM31CR61C226KE15L
HTEP32251B-1R0MIR-89
EV2731-QC-00A Rev. 1.0
www.MonolithicPower.com
4/29/2020
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© 2020 MPS. All Rights Reserved.
14
EV2731-QC-00A – WIDE INPUT, 4.5A, I2C SWITCHING CHARGER EVAL BOARD
EV2731-QC-00A BILL OF MATERIALS (continued)
Qty
8
12
6
Ref
Value
DISC, VREF,
AGND,
OTG, CE,
INT,
NTC,
NTC_BATT
DM, DP,
VBATT,
GND, VSYS,
BST, STAT,
SW
VPMID,
GND, VIN,
ILIM
VIN, PGND,
VBATT,
PGND,
PGND, VSYS
Description
Package
Manufacturer
Manufacture PN
QFN-26
(3.5mmx3.5mm)
MPS
MP2731GQC-0000
DIP
Wurth
2.54mm
connector
Test point
(yellow)
2mm
1
U1
MP2731
1
U2
MicroUSB
IC
Micro-USB
629105150521
EV2731-QC-00A Rev. 1.0
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4/29/2020
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© 2020 MPS. All Rights Reserved.
15
EV2731-QC-00A – WIDE INPUT, 4.5A, I2C SWITCHING CHARGER EVAL BOARD
EVB TEST RESULTS
VIN = 5.0V, VBATT = full range, I2C-controlled, ICC = 0A to 3A, IIN_LIM = 3250mA, VIN_MIN = 4.3V, TA =
25°C, L1 = 1.0μH, CBATT = 22μF, CSYS = 22μF, CIN = 1μF, CPMID = 10μF, unless otherwise noted.
Battery Charge Curve
Auto-Recharge
VIN = 5V, VBATT_REG = 4.2V, ISYS = 0A
VIN = 5V, VBATT_REG = 4.2V, ISYS = 0A
CH1: VSYS
1V/div.
CH2: VBATT
1V/div.
CH1: VSYS
1V/div.
CH2: VBATT
1V/div.
CH3: VSTAT
CH3: VSTAT
2V/div.
2V/div.
CH4: IBATT
1A/div.
CH4: IBATT
1A/div.
4s/div.
4s/div.
Trickle Charge
Pre-Charge
VIN = 5V, VBATT = 1.0V, ISYS = 500mA
VIN = 5V, VBATT = 2.5V, IPRE = 680mA
CH1: VSYS
CH1: VSYS
1V/div.
1V/div.
CH3: VSW
CH3: VSW
2V/div.
2V/div.
CH2: VBATT
CH2: VBATT
1V/div.
1V/div.
CH4: IBATT
100mA/div.
CH4: IBATT
500mA/div.
1μs/div.
1μs/div.
Constant Current Charge
Constant Current Charge
VIN = 5V, VBATT = 3.3V, ICC = 1840mA
VIN = 5V, VBATT = 3.8V, ICC = 1840mA
CH1: VSYS
CH1: VSYS
1V/div.
1V/div.
CH2: VBATT
CH2: VBATT
1V/div.
1V/div.
CH3: VSW
CH3: VSW
2V/div.
2V/div.
CH4: IBATT
1A/div.
CH4: IBATT
1A/div.
1μs/div.
1μs/div.
EV2731-QC-00A Rev. 1.0
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4/29/2020
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16
EV2731-QC-00A – WIDE INPUT, 4.5A, I2C SWITCHING CHARGER EVAL BOARD
EVB TEST RESULTS (continued)
VIN = 5.0V, VBATT = full range, I2C-controlled, ICC = 0A to 3A, IIN_LIM = 3250mA, VIN_MIN = 4.3V, TA =
25°C, L1 = 1.0μH, CBATT = 22μF, CSYS = 22μF, CIN = 1μF, CPMID = 10μF, unless otherwise noted.
Constant Current Charge
Constant Current Charge
VIN = 9V, VBATT = 3.3V, ICC = 1840mA
VIN = 9V, VBATT = 3.8V, ICC = 1840mA
CH2: VBATT
CH2: VBATT
1V/div.
1V/div.
CH1: VSYS
CH1: VSYS
1V/div.
1V/div.
CH3: VSW
CH3: VSW
5V/div.
5V/div.
CH4: IBATT
1A/div.
CH4: IBATT
1A/div.
1μs/div.
1μs/div.
Constant Current Charge
Constant Current Charge
VIN = 12V, VBATT = 3.3V, ICC = 1840mA
VIN = 12V, VBATT = 3.8V, ICC = 1840mA
CH2: VBATT
CH2: VBATT
1V/div.
1V/div.
CH1: VSYS
CH1: VSYS
1V/div.
1V/div.
CH3: VSW
CH3: VSW
5V/div.
5V/div.
CH4: IBATT
CH4: IBATT
1A/div.
1A/div.
1μs/div.
1μs/div.
Constant Current Charge
Constant Current Charge
VIN = 16V, VBATT = 3.3V, ICC = 1840mA
VIN = 16V, VBATT = 3.8V, ICC = 1840mA
CH2: VBATT
CH2: VBATT
1V/div.
1V/div.
CH1: VSYS
CH1: VSYS
1V/div.
1V/div.
CH3: VSW
CH3: VSW
10V/div.
10V/div.
CH4: IBATT
1A/div.
CH4: IBATT
1A/div.
1μs/div.
1μs/div.
EV2731-QC-00A Rev. 1.0
www.MonolithicPower.com
4/29/2020
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© 2020 MPS. All Rights Reserved.
17
EV2731-QC-00A – WIDE INPUT, 4.5A, I2C SWITCHING CHARGER EVAL BOARD
EVB TEST RESULTS (continued)
VIN = 5.0V, VBATT = full range, I2C-controlled, ICC = 0A to 3A, IIN_LIM = 3250mA, VIN_MIN = 4.3V, TA =
25°C, L1 = 1.0μH, CBATT = 22μF, CSYS = 22μF, CIN = 1μF, CPMID = 10μF, unless otherwise noted.
Battery Supplement Mode
Constant Voltage Charge
VIN = 5V, VBATT = 3.8V, ISYS = 4.5A
VIN = 5V, VBATT = 4.19V, ISYS = 0A
CH1: VSYS
CH1: VSYS
1V/div.
1V/div.
CH2: VBATT
CH2: VBATT
1V/div.
1V/div.
CH3: VSW
CH3: VSW
2V/div.
2V/div.
CH4: IBATT
1A/div.
CH4: IBATT
200mA/div.
1μs/div.
1μs/div.
Input Current Limit
Input Voltage Limit
VIN = 5V, VBATT = 3.8V, IIN_LIM = 1800mA
VIN = 5V (2A), VBATT = 3.3V, VIN_MIN = 4.6V
CH2: IIN
CH1: VSYS
500mV/div.
1V/div.
CH4: IBATT
CH3: VIN
500mA/div.
1V/div.
CH1: VSYS
1V/div.
CH2: ISYS
CH3: ISYS
CH4: IBATT
1A/div.
1A/div.
1A/div.
4s/div.
4s/div.
Power-On/Off Waveform
Power-On/Off Waveform
VIN = 5V, IIN_LIM = 500mA, VBATT = 3.8V,
ISYS = 2.5A
VIN = 5V, IIN_LIM = 500mA, VBATT = 3.3V,
ISYS = 0.5A
CH1: VSYS
CH1: VSYS
1V/div.
1V/div.
CH2: VIN
CH2: VIN
2V/div.
2V/div.
CH3: VSW
CH3: VSW
5V/div.
5V/div.
CH4: IBATT
CH4: IBATT
2A/div.
500mA/div.
1s/div.
400ms/div.
EV2731-QC-00A Rev. 1.0
www.MonolithicPower.com
4/29/2020
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2020 MPS. All Rights Reserved.
18
EV2731-QC-00A – WIDE INPUT, 4.5A, I2C SWITCHING CHARGER EVAL BOARD
EVB TEST RESULTS (continued)
VIN = 5.0V, VBATT = full range, I2C-controlled, ICC = 0A to 3A, IIN_LIM = 3250mA, VIN_MIN = 4.3V, TA =
25°C, L1 = 1.0μH, CBATT = 22μF, CSYS = 22μF, CIN = 1μF, CPMID = 10μF, unless otherwise noted.
Suspend Mode On/Off
Charge On/Off
VIN = 5V, IIN_LIM = 500mA, VBATT = 4.0V,
ISYS = 0.5A
VIN = 5V, VBATT = 4.0V, ISYS = 0A
CH1: VSYS
CH1: VSYS
1V/div.
1V/div.
CH2: VBATT
CH2: VBATT
1V/div.
1V/div.
CH3: VSW
CH3: CE
5V/div.
2V/div.
CH4: IBATT
CH4: IBATT
1A/div.
1A/div.
1s/div.
1s/div.
BATFET On/Off
VIN Hot Insertion/Removal
VIN = 5V, VBATT = 4.0V, ISYS = 4A
VIN = 5V, IIN_LIM = 500mA, VBATT = 3.8V
CH2: VBATT
CH1: VSYS
1V/div.
1V/div.
CH1: VSYS
1V/div.
CH2: VIN
CH3: VSW
2V/div.
5V/div.
CH3: VSW
CH4: IBATT
5V/div.
1A/div.
CH4: IBATT
2A/div.
1s/div.
1s/div.
SYS Load Transient
VIN OVP Test
VIN = 5V, VBATT = 3.3V, charge disable,
ISYS = 1A to 3A
VIN = 5V to 17V, VBATT = 3.8V, ISYS = 1A
CH2: VBATT
CH1: VSYS
1V/div.
1V/div.
CH1: VSYS
CH2: VIN
(3.7V offset)
5V/div.
200mV/div.
CH3: VSW
CH3: VSW
5V/div.
5V/div.
CH4: ISYS
CH4: IBATT
2A/div.
2A/div.
400µs/div.
4ms/div.
EV2731-QC-00A Rev. 1.0
www.MonolithicPower.com
4/29/2020
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2020 MPS. All Rights Reserved.
19
EV2731-QC-00A – WIDE INPUT, 4.5A, I2C SWITCHING CHARGER EVAL BOARD
EVB TEST RESULTS (continued)
VIN = 5.0V, VBATT = full range, I2C-controlled, ICC = 0A to 3A, IIN_LIM = 3250mA, VIN_MIN = 4.3V, TA =
25°C, L1 = 1.0μH, CBATT = 22μF, CSYS = 22μF, CIN = 1μF, CPMID = 10μF, unless otherwise noted.
System Reset Mode
Battery Discharge Current
VIN = float, VBATT = 3.8V, ISYS = 2A
VIN = float, VBATT = 4.0V, ISYS = up to 10A
CH2: VBATT
CH2: VBATT
1V/div.
1V/div.
CH1: VSYS
CH1: VSYS
1V/div.
1V/div.
CH3: DISC
CH3: VREF
2V/div.
1V/div.
CH4: IBATT
CH4: ISYS
2A/div.
5A/div.
2s/div.
80µs/div
OTG Mode On
OTG Steady State Operation
VIN = float, OTG mode, VBATT = 3.3V,
IIN_DSCHG = 0.5A, IOTG = 0.5A
VIN = float, OTG mode, VBATT = 4.0V,
IIN_DSCHG = 3.0A, IOTG = 1.5A
CH2: VBATT
CH2: VBATT
1V/div.
2V/div.
CH3: VSW
CH1: VIN
5V/div.
2V/div.
CH3: VSW
CH1: VIN
2V/div.
2V/div.
CH4: IL
CH4: IOTG
1A/div.
500mA/div.
800µs/div.
400ns/div.
OTG Voltage Regulation
NTC JEITA Operation
VIN = float, OTG mode, VBATT = 4.0V,
IIN_DSCHG = 1.5A, IOTG = 0A to 1.5A
VIN = 5V, VBATT = 4.07V, ISYS = 0A,
JEITA_ISET = 50%, JEITA_VSET = -100mV
CH1: VSYS
CH2: VBATT
1V/div.
1V/div.
CH2: VBATT
CH1: VIN
1V/div.
2V/div.
CH3: VNTC
CH3: VSW
500mV/div.
5V/div.
CH4: IOTG
CH4: IBATT
1A/div.
1A/div.
1s/div.
4s/div.
EV2731-QC-00A Rev. 1.0
www.MonolithicPower.com
4/29/2020
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2020 MPS. All Rights Reserved.
20
EV2731-QC-00A – WIDE INPUT, 4.5A, I2C SWITCHING CHARGER EVAL BOARD
PCB LAYOUT
Figure 32: Top Layer
Figure 33: Mid-Layer 1
Figure 34: Mid-Layer 2
Figure 35: Bottom Layer
NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications.
Users should warrant and guarantee that third-party Intellectual Property rights are not infringed upon when integrating MPS
products into any application. MPS will not assume any legal responsibility for any said applications.
EV2731-QC-00A Rev. 1.0
www.MonolithicPower.com
4/29/2020
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2020 MPS. All Rights Reserved.
21
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