EV2632-R-01A – 3A CHARGER, 3A BOOST DISCHARGE, ALL-IN-ONE
EV2632-R-01A Rev. 1.01
www.MonolithicPower.com
5
1/14/2016
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QUICK START GUIDE
This board is designed for the MP2632, 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 4.35V for a 1-cell Li-Ion battery.
Charge Mode Setting
1. 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. R
ILIM
—the resistor connected to the ILIM pin—programs this
limit. To set the input current limit at 2.7A, use a R
ILIM
of 14.7k
Ω
.
Ω
=
Ω
ILIM
ILIM
40(k )
I
(A)
R
(k )
(1)
2. Charge-Full
Voltage
To set the charge-full voltage, leave the VB pin floating for 4.2V, connect VB to L for 4.35V and
connect VB to H for 4.45V.
3. Charge
Current
The charge current can be programmed via both RS1 and R
ISET
. With given RS1=10m
Ω
, determine
the charge current using the following formula:
=
Ω ×
CHG
ISET
1500
I
(A)
R
(k ) RS1(mA)
(2)
For example, for a charge current of 3A, use a 49.9k
Ω
R
ISET
Boost Mode
1. System-Output-Current
Limit
Set the system-output-current limit in boost mode for the EV2632 to operate like a standard USB
charger. Set the output current limit as the following equation:
=
Ω ×
Ω
OLIM
OLIM
1500
I
(A)
R
(k ) RS1(m )
(3)
2. BOOST Automatic On when Load is Applied
The load is applied to the USB port connected to the SYS output which is U3 in the schematic.
To detect the USB load plug in, the RC network (R11,C14) is connected to USB port (U3) shield
(V
BUS
) Once the USB load is inserted to the SYS through U3, the USB connector shield is grounded
through USB load. So a short pulse (high to Low for >1.5ms) is generated in PB pin, resulting in
start of boost operation. M2 is used to decouple USB port from the VSYS cap (C2, C
SYS
), M1 is
used to drive the M2.Once the Phone is plugged in, the voltage at C14
will be pulled down because
the input cap inside phone is far larger than C14 (even don’t need), so that the falling edge will be
delivered to PB pin to enable boost automatically. M3 is used to cutoff the PB pin to the USB port
when the BOOST is turned on. Then PB pin state will not be affect by the spec of the inserted load
of the USB port. Choose M3 with low turning on threshold (-0.7V is recommended) which could
make sure it is fully on when the load is inserted and its on resistance will not cause too much
voltage drop.
For the other detailed description on the operation of the MP2632, please refer to the datasheet.
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