MP2623 Datasheet, PDF (1/16 Pages) Monolithic Power Systems – Stand-Alone, 2A, 1- or2-Cell Switching LiFePO4 Battery Charger

The Future of Analog IC Technology
DESCRIPTION
The MP2623 is a monolithic, DC-DC, step-
down, switching charger for a 1-or-2-cell serial
LiFePO₄ battery. It has an integrated high-side
power MOSFET that can output up to a 2A
charge current. It also has peak-current–mode
control for fast loop response and easy
compensation.
The MP2623 uses a sense resistor to control a
programmable charge current, and accurately
regulates the charge current and the charge
voltage using two control loops.
The MP2623 has multiple fault-condition
protections that include cycle-by-cycle current
limiting and thermal shutdown. Other safety
features include battery temperature monitoring
and protection, charge status indication and a
programmable timer to halt charging after a set
time period.
The MP2623 requires a minimal number of
readily-available external components.
The MP2623 is available in a 4mm×4mm 16-pin
QFN package.
MP2623
Stand-Alone, 2A, 1- or2-Cell
Switching LiFePO₄ Battery Charger
FEATURES
 Charges 1- and 2-Cell LiFePO₄ Battery
Packs
 Wide Operating-Input Range
 Programmable Charging Current of up to 2A
 ±0.75% V_BATT Accuracy
 0.2Ω Integrated Power MOSFET
 Up to 90% Efficiency
 Fixed 1.1MHz Frequency
 Preconditioning for Fully-Depleted Batteries
 Charging Status Indicator
 Input Supply Fault Indicator
 Thermal Shutdown
 Cycle-by-Cycle Over-Current Protection
 Battery Temperature Monitor and Protection
APPLICATIONS
 Power Tools and Portable Equipment
 Handheld Terminals
 LiFePO₄ Battery Chargers
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Quality Assurance. “MPS” and “The
Future of Analog IC Technology” are Registered Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
V_IN
D1
5.5V to 24V
CIN
C1
10
4.7
C3
1
R3
10k
R1 R2
VIN
VREF33
SW
C7
VCC ^MP2623 BST ^0.1
L
4.7
D2
CHGOK
ACOK
CELLS
CSP
BATT
COMPI
R5 750
RS1
100 m
C2
1-2 Cell
LiFePO₄
22
RNTC
10k
NTC
EN
ON OFF
COMPV
GND TMR
R4 2.5k
C6
0.1
C4
2.2nF
C5
2. 2nF
MP2623 Rev. 1.0
www.MonolithicPower.com
1
3/16/2012
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.