MP2674
Li-Ion Battery Charger
Protection Circuit
The Future of Analog IC Technology
DESCRIPTION
The MP2674 is a high-performance single cell
Li-Ion/Li-Polymer battery charger protection
circuit. By integrating high voltage input
protection into the IC, the MP2674 can tolerate
an input surge up to +30V.
The device features input over voltage
protection (OVP), battery over voltage
protection (BOVP) and over charge current
protection (OCP). The device also provides
fault indications to the system when any of the
protection events happens.
For guaranteed safe operation, the MP2674
monitors its own internal temperature and turns
off the MOSFET bridging VIN and OUT when
the die temperature exceeds 150
o
C.
The MP2674 is available in an 8-pin 2mmx2mm
QFN package.
FEATURES
•
•
•
•
•
•
•
•
•
•
•
•
•
Input Surge up to 30V
Input Over voltage protection in 1µs.
Proprietary Battery Over-Voltage Protection
Programmable Charge Current Protection
Limit Value.
Temperature Monitoring and Protection
Fault Indication
2mmx2mm QFN Package
Cell Phones
MP3 Players
Smart Phones
PDA
Digital Cameras
Desktop Chargers
APPLICATIONS
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
INPUT
C
IN
R
ILIM
VIN
OUT
C
OUT
MP2674
ILIM
VB
LINEAR
BATTERY
CHARGER
R
VB
GND
FLT
Battery
Pack
+
R
FLT
MP2674 Rev. 0.9
11/8/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
1
MP2674 – CHARGE SYSTEM PROTECTION CIRCUIT
ORDERING INFORMATION
Part Number*
MP2674EG
Package
QFN8 (2mm x 2mm)
Top Marking
2Q
Free Air Temperature (T
A
)
-20°C to +85°C
*For
Tape & Reel, add suffix –Z (e.g. MP2674EG–Z):
For RoHS compliant packaging, add suffix –LF (e.g. MP2674EG–LF–Z).
PACKAGE REFERENCE
TOP VIEW
VIN
GND
NC
FLT
1
2
3
4
8
7
6
5
OUT
ILIM
VB
GND
ABSOLUTE MAXIMUM RATINGS
(1)
V
IN
to GND.......................................-0.3V to 30V
OUT and VB to GND.........................-0.3V to 7V
Other Pins (ILIM,
FLT
)...................-0.3V to 5.5V
(2)
Continuous Power Dissipation ...(T
A
= +25°C)
....................................................…....1.25W
Junction Temperature ...............................150°C
Lead Temperature (Solder).......................260°C
Storage Temperature............... -65°C to +150°C
Thermal Resistance
(4)
QFN8 (2mm x 2mm) .............. 100 ..... 55...
°C/W
Notes:
1) Exceeding these ratings may damage the device.
2) The maximum allowable power dissipation is a function of the
maximum junction temperature T
J
(MAX), the junction-to-
ambient thermal resistance
θ
JA
, and the ambient temperature
T
A
. The maximum allowable continuous power dissipation at
any ambient temperature is calculated by P
D
(MAX) = (T
J
(MAX)-T
A
)/θ
JA
. Exceeding the maximum allowable power
dissipation will cause excessive die temperature, and the
regulator will go into thermal shutdown. Internal thermal
shutdown circuitry protects the device from permanent
damage.
3) The device is not guaranteed to function outside of its
operating conditions.
4) Measured on JESD51-7, 4-layer PCB.
θ
JA
θ
JC
Recommended Operating Conditions
(3)
Supply Voltage V
IN
..........................4.3V to 5.5V
Operating Current Range…………….0A to 1.5A
Operating Junct. Temp (T
J
)...... -20°C to +125°C
MP2674 Rev. 0.9
11/8/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
2
MP2674 – CHARGE SYSTEM PROTECTION CIRCUIT
ELECTRICAL CHARACTERISTICS
V
IN
= 5V, T
A
= +25°C, unless otherwise noted.
Parameter
Power-On Reset
Rising VIN Threshold
POR Hysteresis
VIN Bias Current
Protection
Input Over-voltage Protection
(OVP)
Input OVP Hysteresis
Input OVP Falling Threshold
Input OVP Propagation Delay
Over-current Protection
Overcurrent Protection Blanking
Time
Battery Over-voltage Protection
Threshold
Battery OVP Threshold
Hysteresis
Battery OVP Falling Threshold
Battery OVP Blanking Time
VB Pin Leakage Current
Over Temperature Protection
Rising Threshold
Over Temperature Protection
Falling Threshold
Logic
I
VIN
When enabled
When disabled
5.6
5.45
I
OCP
BT
OCP
V
BOVP
4.29
V
VB
= 3V, R
ILIM
= 25kΩ
0.78
0.90
170
4.37
55
4.225
BT
BOVP
V
VB
= 4.34V
150
110
180
20
4.475
1
1.10
V
POR
2.35
2.43
110
0.6
25
5.80
50
6.0
2.50
V
mV
mA
µA
V
mV
V
µs
A
µs
V
mV
V
µs
nA
°C
°C
0.8
V
Ω
1.5
µA
Symbol
Condition
Min
Typ
Max
Units
V
OVP
F L T
F L T
F L T
Output Logic Low
Parasitic Series Resistor
Sink 5mA current
0.25
60
Output Logic High Leakage
Current
Power MOSFET
On Resistance
R
DS(ON)
Measured at 200mA,
200
300
mΩ
MP2674 Rev. 0.9
11/8/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
3
MP2674 – CHARGE SYSTEM PROTECTION CIRCUIT
PIN FUNCTIONS
8-pin
QFN
1
2, 5
3
4
6
7
8
Name
VIN
GND
NC
FLT
Description
Input Power Source. VIN can withstand 30V input.
System Ground.
No Connect. Keep it floating.
Open-Drain Logic Output. This pin turns LOW when any protection event occurs.
Connect a pull-up resistor to VIN pin. Higher than 10kΩ is recommended.
Battery Voltage Monitoring Input. Connect this pin to the battery pack positive
terminal via an isolation resistor.
Over-current Protection Threshold Setting. Connect a resistor between this pin and
GND to set the OCP threshold.
Output pin and input pin of the protected charger.
VB
ILIM
OUT
MP2674 Rev. 0.9
11/8/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
4
MP2674 – CHARGE SYSTEM PROTECTION CIRCUIT
TYPICAL PERFORMANCE CHARACTERISTICS
V
IN
=5V, R
ILIM
=24.9kΩ, R
VB
=200kΩ, R
F L T
=100kΩ, T
A
=25
o
C, unless otherwise noted.
V
IN
Steps from 5V to 20V
without Load
Input OVP
Input OVP
Ramp Up V
IN
Slowly
without Load
V
IN
V
IN
2V/div.
V
OUT
2V/div.
V
IN
2V/div.
V
OUT
2V/div.
I
OUT
200mA/div.
V
IN
5V/div.
V
BAT
5V/div.
FLT
5V/div.
V
BAT
FLT
5V/div.
Input OVP Start Up
Ramp Up V
IN
Slowly from 0V to 6.6V
without Load
V
IN
2V/div.
VB
2V/div.
V
IN
2V/div.
V
OUT
2V/div.
I
OUT
200mA/div.
FLT
5V/div.
V
OUT
2V/div.
Battery OVP
No Load, Shut Dwon Permanently
after 16 Times
V
OUT
2V/div.
I
OUT
200mA/div.
FLT
5V/div.
FLT
5V/div.
I
OUT
200mA/div.
OCP Before Start Up
Shut Dwon Permanently after 16 Times
V
IN
2V/div.
Zoom In of OCP
Before Start Up
V
IN
2V/div.
V
OUT
2V/div.
I
OUT
500mA/div.
FLT
5V/div.
V
OUT
2V/div.
I
OUT
500mA/div.
FLT
5V/div.
MP2674 Rev. 0.9
11/8/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
5
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