Transcript
MP2678 Li-Ion Battery Charger Protection Circuit With LDO Mode The Future of Analog IC Technology
DESCRIPTION
FEATURES
The MP2678 is a high performance single cell Li-Ion/Li-Polymer battery charger protection IC. By integrating the high voltage input protection, the MP2678 can tolerate an input surge up to +30V.
• • • • • • • • • •
The device operates like a linear regulator, maintaining a 5V output with the input voltage up to the over voltage protection threshold. MP2678 features input over voltage protection (OVP), battery over voltage protection (BOVP) and over charge current protection (OCP). When any fault condition happens, the IC will immediately turn off the internal N-MOSFET to disconnect the charging circuit from the input. The device also provides fault indications to the system when any of the protection events happens.
Input Surge up to 30V Input Over Voltage Protection Proprietary Battery Over-Voltage Protection Output Short-Circuit Protection Soft-Stop to Prevent Voltage Spikes Support up to 1.7A Load Current Thermal Monitoring and Protection Enable Function Fault Indication 2 mm×2mm QFN Package
APPLICATIONS • • • • •
For guaranteed safe operation, the MP2678 monitors its own internal temperature and turns off the internal N-MOSFET bridging IN and OUT when the die temperature exceeds 140oC.
Cell Phones Smart Phones PDAs MP3 Players Low-Power Handheld Devices
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.
The MP2678 is available in an 8-pin 2mm x 2mm QFN package.
TYPICAL APPLICATION CIRCUIT VIN VIN
OUT
MP2678
VIN On Off
CE
COUT
VB RVB
GND
FLT
Battery Pack
+
3.3V~VOVP
LINEAR BATTERY CHARGER
RFLT
MP2678 Rev. 1.0 1/6/2011
www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved.
1
MP2678 – LI+ BATTERY CHARGER PROTECTION CIRCUIT WITH LDO MODE
ORDERING INFORMATION Part Number* MP2678EG-104
VOVP 10.4V
Package QFN8 (2mm×2mm)
Top Marking AK
Free Air Temperature (TA) -20°C to +85°C
*For different input OVP version, add suffix –XXX (e.g. MP2678EG-73 is 7.3V OVP) Contact factory for availability. For Tape & Reel, add suffix –Z (eg. MP2678EG–104–Z); For RoHS, compliant packaging, add suffix –LF (eg. MP2678EG–104–LF–Z).
PACKAGE REFERENCE
TOP VIEW VIN
1
8
OUT
GND
2
7
NC
NC
3
6
VB
FLT
4
5
CE
ABSOLUTE MAXIMUM RATINGS (1)
Thermal Resistance
VIN to GND ..................................... -0.3V to 30V OUT to GND ..................................... -0.3V to 7V Others to GND .................................. -0.3V to 7V (2) Continuous Power Dissipation...(TA = +25°C) ....................................................…....1.25W Junction Temperature ................. -20ºC to 150ºC Storage Temperature .................. -65ºC to 150ºC
QFN8 2mm×2mm ................... 80 ...... 60... °C/W
ESD Susceptibility(3) HBM (Human Body Mode) ..........................2kV MM (Machine Mode) ................................ 200V
Recommended Operating Conditions
(4)
Supply Input Voltage ..................... 3.3V to VOVP Output Current ............................................ 1.5A Maximum Junction Temp. (TJ) ............... +125°C
MP2678 Rev. 1.0 1/6/2011
(5)
θJA
θJC
Notes: 1) Exceeding these ratings may damage the device. 2) The maximum allowable power dissipation is a function of the maximum junction temperature TJ (MAX), the junction-toambient thermal resistance θJA, and the ambient temperature TA. The maximum allowable continuous power dissipation at any ambient temperature is calculated by PD (MAX) = (TJ (MAX)-TA)/θJA. 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) Devices are ESD sensitive. Handling precaution recommended. 4) The device is not guaranteed to function outside of its operating conditions. 5) Measured on JESD51-7, 4-layer PCB.
www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved.
2
MP2678 – LI+ BATTERY CHARGER PROTECTION CIRCUIT WITH LDO MODE
ELECTRICAL CHARACTERISTICS VIN=5.5V, TJ= -20ºC to 125ºC, unless otherwise noted. Parameter
Symbol
Power-On Reset Output Voltage Rising VIN Threshold
VOUT VPOR
Condition
Min
Typ
Max
Units
5.5V30V/5mA=6kΩ The recommended value is between 6kΩ to 200kΩ. While a LED is used to indicate the status, in order to drive the LED, a smaller resistor should be selected such as 6.04kΩ.
www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved.
10
MP2678 – LI+ BATTERY CHARGER PROTECTION CIRCUIT WITH LDO MODE
PACKAGE INFORMATION QFN8 (2mmx2mm)
PIN 1 ID MARKING
1.90 2.10
0.25 0.45 0.18 0.30 1.90 2.10
PIN 1 ID INDEX AREA
PIN 1 ID SEE DETAIL A
0.45 0.65 8
1 1.05 1.25
0.50 BSC 5
TOP VIEW
4
BOTTOM VIEW
0.80 1.00
PIN 1 ID OPTION A 0.30x45º TYP.
PIN 1 ID OPTION B R0.20 TYP.
0.20 REF 0.00 0.05
SIDE VIEW
DETAIL A
NOTE:
1.90 0.70
0.60
1) ALL DIMENSIONS ARE IN MILLIMETERS. 2) EXPOSED PADDLE SIZE DOES NOT INCLUDE MOLD FLASH. 3) LEAD COPLANARITY SHALL BE 0.10 MILLIMETER MAX. 4) DRAWING CONFORMS TO JEDEC MO-229, VARIATION VCCD-3. 5) DRAWING IS NOT TO SCALE.
0.25
1.20
0.50
RECOMMENDED LAND PATTERN
NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications. 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. MP2678 Rev. 1.0 1/6/2011
www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved.
11
