MPS EV2637A-R-00A User manual

EV2637A-R-00A
2.5A Single Cell Switch Mode Battery Charger
with Power Path Management (PPM)
and 2.4A Boost Current with Trickle Timer
EV2637A-R-00A Rev. 1.0 www.MonolithicPower.com 1
10/11/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2019 MPS. All Rights Reserved.
DESCRIPTION
The EV2637A-R-00A is the evaluation board
designed to demonstrate the capabilities of
MPS’ MP2637A, a highly-integrated, flexible
switch-mode battery charge management and
system power path management device for a
single-cell Li-ion and Li-Polymer battery used in
a wide range of portable applications.
EV2637A uses two operating modes—charge
mode and boost mode—to allow management
of system and battery power based on the state
of the input.
When input power is present, the board
charges a single-cell battery with a
programmable charge current of up to 2.5A.
In the absence of an input source, the board
switches to boost mode through the MODE pin
to power the SYS pins from the battery with a
current of up to 2.1A.
The evaluation board provides full-operating-
status indicators to distinguish charge mode
from boost mode.
To guarantee safe operation, the EV2637A has
input-over-voltage protection, battery over-
voltage protection, thermal shutdown, battery-
temperature monitoring, and a programmable
timer to prevent prolonged charging of a dead
battery.
ELECTRICAL SPECIFICATION
Parameter
Symbol
Value
Units
Charge Mode
Input Voltage Range
VIN
4.5 –6
V
Charge-Full Voltage
VBATT_Full
4.055 /4.2
V
Charge Current
ICHG
2.5
A
Input Current Limit
IIN_LIM
2.7
A
Boost Mode
Battery Voltage
VBATT
3-4.5
V
SYS Voltage
Regulation
VSYS
5
V
SYS Output Current
Limit
ISYS
2.2
A
FEATURES
4.5V-to-6V Operating Input Voltage Range
Power Management Function Integrated
Input-Current-Limit and Input –Voltage -
Regulation
Up to 2.5A Programmable Charge Current
Selectable 4.055V / 4.2V Charge Voltage
with 0.5% Accuracy
Battery Temperature Monitoring
Full Operation Indicators
Programmable Timer-Back-Up Protection
Battery-Reverse-Leakage Blocking
Reverse-Boost-Operation for Powering
System
Up to 93% 5V Boost Mode Efficiency @
2.1A with BATT=4.2V
Up to 2.1A Programmable Output Current
Limit in Boost Mode
APPLICATIONS
Sub-battery Applications
Power-bank Applications for Smart-Phone,
Tablet and Other Portable Devices
All MPS parts arelead-free and adhere to theRoHS directive. For MPS green
status, please visit MPS website under Products, Quality Assurance page.
“MPS” and “The Future of Analog IC Technology”, are Registered Trademarks
of Monolithic PowerSystems, Inc.

EV2637A-R-00A –2.5A SINGLE-CELL SWITCH MODE BATTERY CHARGER
EV2637A-R-00A Rev. 1.0 www.MonolithicPower.com 2
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© 2019 MPS. All Rights Reserved.
EV2637A-R-00A EVALUATION BOARD
(L × W × H) 6.1cm × 5.1cm × 1.3cm
Board Number
MPS IC Number
EV2637A-R-00A
MP2637AGR
EVALUATION BOARD SCHEMATIC

EV2637A-R-00A –2.5A SINGLE-CELL SWITCH MODE BATTERY CHARGER
EV2637A-R-00A Rev. 1.0 www.MonolithicPower.com 3
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EV2637A-R-00A BILL OF MATERIALS
Qty.
Ref
Value
Description
Package
Manufacture
Manufacture_PN
1
C1
1μF
Ceramic Capacitor;
25V;X7R
0603
TDK
C1608X7R1E105K
1
C2
1μF
Ceramic Capacitor;
16V;X7R;
0603
muRata
GRM188R71C105KA12D
4
C3, C7,
CBATT,
CSYS
22μF
Ceramic Capacitor;
10V;X7R;
1206
muRata
GRM31CR71A226KE15L
2
C4,
CTMR
100nF
Ceramic Capacitor;
16V;X7R;
0603
muRata
GRM188R71C104KA01D
1
C5
NC
Ceramic Capacitor;
25V;X5R;
1206
1
C6
NC
Ceramic Capacitor;
10V;X7R;
1206
1
C8
NC
Ceramic Capacitor;
50V;C0G;
0603
1
C9
NC
Ceramic Capacitor;
25V;X7R;
0603
2
C10,C1
1
NC
Ceramic Capacitor;
16V;X7R;
0603
1
CIN
22μF
Ceramic Capacitor;
25V;X5R;
1206
murata
GRM31CR61E226KE15
1
L1
2.2μH
Inductor;2.2uH;9m;7.
2A
SMD
muRata
LQH88PN2R2N38
2
LED2,
LED3
BL-
HUF35A-
TRB
LED; Red
0805
BRIGHT LED
BL-HUF35A-TRB
1
LED1
BL-
HGB35A-
TRB
LED; Green
0805
BRIGHT LED
BL-HGB35A-TRB
1
R1
31.6kΩ
Film Resistor;1%;
0603
Yageo
RC0603FR-0731K6L
3
R2,
RT1,
RT2
10kΩ
Film Resistor;1%;
0603
Yageo
RC0603FR-0710KL
1
R3
15kΩ
Film Resistor;1%;
0603
Yageo
RC0603FR-0715KL
1
RILIM
16.5kΩ
Film Resistor;1%;
0603
Yageo
RC0603FR-0716K5L
2
R4, RL
5.1kΩ
Film Resistor;1%;
0603
Yageo
RC0603FR-075K1L
3
R5, R6,
R7
10kΩ
Film Resistor;5%;
0603
Yageo
RC0603JR-0710K
3
R9,
R10,
R11
2kΩ
Film
Resistor;5%;1/10W
0603
LIZ
CR0603JA0202G
1
RH
23.7kΩ
Film Resistor; 1%
0603
Yageo
RC0603FR-0723K7L
1
RISET
47.5kΩ
Film Resistor;1%
0603
Yageo
RC0603FR-0747K5L
1
ROLM
53.6kΩ
Film Resistor;1%
0603
Yageo
RC0603FR-0753K6L
1
RS1
20mΩ
Film Resistor;1%
1206
Vishay
WSL1206-18
1
RT
0Ω
Film Resistor;5%;
0603
Yageo
RC0603JR-070RL
1
U1
MP2637
AGR
QFN24
(4mmx4mm)
MPS
MP2637AGR

EV2637A-R-00A –2.5A SINGLE-CELL SWITCH MODE BATTERY CHARGER
EV2637A-R-00A Rev. 1.0 www.MonolithicPower.com 4
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PRINTED CIRCUIT BOARD LAYOUT
Figure 1: Top Silkscreen Layer
Figure 2: Top Layer
Figure 3: Bottom Layer

EV2637A-R-00A –2.5A SINGLE-CELL SWITCH MODE BATTERY CHARGER
EV2637A-R-00A Rev. 1.0 www.MonolithicPower.com 5
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© 2019 MPS. All Rights Reserved.
QUICK START GUIDE
This board is designed for the MP2637A, a stand-alone switch-mode battery charge management and
system power path management device with integrated reverse directional boost from BATT to SYS.
The board’ layout accommodates most commonly-used capacitors. The default function of this board is
preset at charge mode, and the charge full voltage is preset to 4.2V for a 1-cell Li-Ion battery.
Charge Mode Setting
1. Input-Over-Voltage-Limit
The MP2637A has a PWIN pin to monitor the input voltage. Once the voltage input voltage at PWIN
pin exceeds 1.15V, the input to system path is cut off to protect the device from being damaged.
The maximum input is 6V, and the external resistor divider must meet the following equation:
PWIN
IN
V1.15 RL
V 6 RH RL


(1)
Assume that RL=5.1kΩ, then RH is 21.5kΩ.
2. REG Voltage
When the input power source is not sufficient to support both the charge current and system load
current, the charge current is reduced to allow priority of system power and maintain the input
voltage avoid dropping further. The REG pin is the input-voltage regulation feedback. The input
voltage can be regulated by a resistor divider from VIN pin to REG pin to AGND
)(
44R3
15.1 V
RR
VVREG


(2)
If VREG=4.75V, given R4=5.1kΩ, then R3=15.8kΩ.
3. Input Current Limit
An input current limit can be set slightly below the input source’s maximum current rating. When the
input current hits this limit, the charge current will decrease to keep the input current constant at the
limit value to initially power the system. RILIM—the resistor connected to the ILIM pin—programs this
limit. To set the input current limit at 2.7A, use an RILIM of 16.5kΩ.

ILIM ILIM
45(kV)
I (A) R (kΩ)
(3)
4. Charge-Full Voltage
To set the charge-full voltage, either leave the VB pin floating, or connect it to high logic for 4.055V
and to connect to GND for 4.2V.
5. Charge Current
The charge current can be programmed via both RS1 and RISET. With given RS1=20mΩ, determine
the charge current using the following formula:
CHG ISET
2400
I (A) R (k ) RS1(mA) 
(4)
For example, for a charge current of 2.5A, use a 47.5kΩRISET.

EV2637A-R-00A –2.5A SINGLE-CELL SWITCH MODE BATTERY CHARGER
EV2637A-R-00A Rev. 1.0 www.MonolithicPower.com 6
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6. Charge Timer
The MP2637A has a charge timer as an extra precaution against charging damaged batteries. The
total charge time can be set as:
6TMR
TOTAL_TMR CHG
3.4 10 1.6(V) C ( F) (s)
1.25 I (A) RS1(m ) 2( A)
   

    
(5)
So if the charge current is 2.5A, a CTMR of 0.1μF provides a tTOTAL_TMR of 2.4 hours.
Boost Mode
1. System Output Voltage
The MODE pin can enable or disable the EV2637A when in boost mode. The resistor divider–R1
and R2–can adjust the output voltage as per the following equation:
221
15.1)(
_RRR
VVV REGSYS


(6)
Select R1 and R2 as 31.6kΩ and 10kΩ, respectively, for a system voltage of 4.8V.
2. System-Output-Current Limit
Set the system-output-current limit in boost mode for the EV2637A to operate like a standard
adapter. Set the output current limit as per the following equation:
OLIM OLIM
2400
I (A) R (k ) RS1(m )
  
(7)
For the other detailed description on the operation of the MP2637A, please refer to the
datasheet.

EV2637A-R-00A –2.5A SINGLE-CELL SWITCH MODE BATTERY CHARGER
EV2637A-R-00A Rev. 1.0 www.MonolithicPower.com 7
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© 2019 MPS. All Rights Reserved.
EQUIPMENT REQUIREMENT
Evaluation requires the following equipments:
1. DC power source. The output voltage should exceed 6.0V, and output current greater than
2.5A.
2. Battery simulator or a single-cell battery pack. The battery simulator’s output rating should
exceed 4.5V/3.0A. When using a real battery pack, please observe all precautions on the
battery manufacturer’s data sheet first and ensure the charger’s setting doesn’t exceed the
battery’s absolute maximum specifications.
3. An oscilloscope. A single voltage probe and a single current probe.
4. Multi-meter.
Charge Function
1 Connect the jumper “EN” to “H” and the “MODE” to “L” to shunts, respectively!
2 Attach the positive and negative ends of the battery to the “BATT” and “GND” terminals,
respectively. If it’s a battery simulator, please preset the voltage to 3.8V (typical value) first.
3 Preset the DC power source to 5.0V. Then attach the DC output port and ground to the “VIN”
and “GND” terminals, respectively.
4 Turn on the DC power source. The charger will start. Use the oscilloscope to verify that the 2.5A
charge current is being delivered to the battery.
5 Remove the shunt between the “EN” and “H” to disable charging.
6 Re-insert the shunt between the “EN” and “H” to enable charging.
U1
MAIN CIRCUIT
EV2637A-R-00A
GND
VIN
BATT
GND
1-Cell
Battery Pack
or Simulator
DC
Power
Supply
VB
LED2
LED3
SYS
VCC NTCGND
BATT
JP1 JP2 JP3
EN MODE
H
L L
LED1
H
L
H
LED
JP4
VCC
SYS
Figure 4: Setup for Charge Mode

EV2637A-R-00A –2.5A SINGLE-CELL SWITCH MODE BATTERY CHARGER
NOTICE: The information in this document is subject to change without notice. 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.
EV2637A-R-00A Rev. 1.0 www.MonolithicPower.com 8
10/11/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2019 MPS. All Rights Reserved.
Boost Function
1 Connect the jumper “MODE” to “H” and the “EN” to “L” with shunts respectively!
2 Attach the load to the “SYS” and “GND” terminals respectively.
3 Attach the positive and negative ends of the battery to the “BATT” and “GND” terminals respectively.
If it’s a battery simulator, please preset the voltage to 3.8V (typical value) firstly. The boost will start
to work. Verify the system output current is limited at 2.2A.
4 Remove the shunt between the “MODE” and “H” to disable boost.
5 Install the shunt between the “MODE” and “H” to enable boost.
U1
MAIN CIRCUIT
EV2637A-R-00A
GND
VIN
BATT
GND
1-Cell
Battery Pack
or Simulator
SYS
load
VB
LED2
LED3
SYS
VCC NTCGND
BATT
JP1 JP2 JP3
EN MODE
H
L L
LED1
H
L
H
LED
JP4
VCC
SYS
Figure 5: Setup for Boost Mode