MP2612 MPS, MP2612 Datasheet - Page 6

• Manufacturer Part Number: MP2612
• Description: 2a,24v Input, 600khz 2/3-cell Switching Li-ion Battery Charger
• Manufacturer: MPS

PIN FUNCTIONS
MP2612 Rev. 0.92
11/23/2010
Pin #
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
9
CHGOK
VREF33
VREF25 Internal linear 2.5V reference circuit. Please keep this pin float.
COMPV V-LOOP Compensation. Decouple this pin with a capacitor and a resistor.
COMPI I-LOOP Compensation. Decouple this pin with a capacitor and a resistor.
ACOK
CELLS
Name
BATT
GND
NTC
TMR
CSP
BST
EN
SW
IN
MP2612 – 2A, 24V INPUT, 600kHz 2-3CELL SWITCHING LI-ION BATTERY CHARGER
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
Description
Thermistor Input. Connect a resistor from this pin to the pin VREF33 and the Thermistor
from this pin to ground.
Valid Input Supply Indicator. A logic LOW on this pin indicates the presence of a valid input
supply.
Charging Status Indicator. A logic LOW indicates charging operation. The pin will become
an open drain once the charging is completed or suspended.
Internal linear regulator 3.3V reference output. Bypass to GND with a 1µF ceramic
capacitor.
On/Off Control Input.
Command Input for the number of Li-Ion Cells. Make this pin float for 3-cell operation and
connect this pin to ground for 2-cell operation.
Positive Battery Terminal.
Battery Current Sense Positive Input. Connect a resistor RS1 between CSP and BATT. The
full charge current is:
Ground. This pin is the voltage reference for the regulated output voltage. For this reason
care must be taken in its layout. This node should be placed outside of the switching diode
(D2) to the input ground path to prevent switching current spikes from inducing voltage
noise into the part.
Set time constant. 0.1uA current charges and discharges the external cap. Connect TMR
pin to GND to disable the internal timer
Bootstrap. This capacitor is needed to drive the power switch’s gate above the supply
voltage. It is connected between SW and BS pins to form a floating supply across the power
switch driver.
Switch Output.
Supply Voltage. The MP2612 operates from a 9V to 24V unregulated input to charge 2-3
cell li-ion battery. Capacitor is needed to prevent large voltage spikes from appearing at the
input.
I
CHG
© 2010 MPS. All Rights Reserved.
www.MonolithicPower.com
( )
A
=
RS1
200mV
(
mΩ
)
.
6