MP2618EV-LF-P Monolithic Power Systems

MP2618 2A, 24V Input, 600kHz 2-3 Cell Switching Li-Ion Battery Charger With System Power Path Management The Future of Analog IC Technology DESCRIPTION FEATURES The MP2618 is a monolithic switching charger Charges 2-3 cell Li-Ion battery packs for 2-3 cell Li-Ion battery packs with a built-in Wide Operating Input Range internal power MOSFET. It achieves up to 2A Up to 2A Programmable Charging Current charge current with current mode control for Power Path Management with Current fast loop response and easy compensation. Sharing The charge current can be programmed by 0.75% V Accuracy BATT sensing the current through an accurate sense 0.28 Internal Power MOSFET Switch resistor. Up to 90% Efficiency MP2618 regulates the charge voltage and Fixed 600kHz Frequency charge current using two control loops to realize Preconditioning for fully depleted batteries high accuracy CC charge and CV charge. Charging Operation Indicator Input Supply and battery fault indicator The system power path management function Thermal Shutdown ensures continuous supply to the system by Cycle-by-Cycle Over Current Protection automatically selecting the input or the battery. Battery Temperature Monitor and Protection Power path management separates charging current from system load. When the MP2618 APPLICATIONS realizes current sharing of the input current, Netbook PC charge current will drop down according to the increase of the system current. Distributed Power Systems Chargers for 2-Cell or 3-Cell Li-Ion Fault condition protection includes cycle-by-cycle Batteries current limiting, and thermal shutdown. Other Pre-Regulator for Linear Regulators safety features include battery temperature monitoring, charge status indication and MPS and The Future of Analog IC Technology are Registered Trademarks of Monolithic Power Systems, Inc. programmable timer to cease the charging cycle. The MP2618 is available in a 28-pin, 4mmx5mm QFN package. MP2618 Rev. 0.92 www.MonolithicPower.com 1 7/14/2010 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. 2010 MPS. All Rights Reserved. MP2618 2A, 24V INPUT, 600kHz 2-3CELL SWITCHING LI-ION BATTERY CHARGER TYPICAL APPLICATION M1 M3 RS2 V IN V SYS 20m C8 C10 RG2 RG1 10F 22uF LED1 51 51 R1 510 M2 LED2 R2 510 L CHGOK ACOK VCC RG1 RG2 4.7F RS1 V BAT PIN C2 SW 2/3 cells C7 4.7F 110m C9 0.1F battery D1 22uF BST AIN C1 10F CELLS OUT1 RGS1 280 VREF33 CSP MP2618 R3 C3 VREF25 10k BATT 10F RGS2 280 NTC R NTC OUT2 10k NC EN ON OFF SHDN COMPV COMPI GND TMR C TMR R4 R5 0.1uF 2.7k 750 C4 C5 2.2nF 2.2nF Figure 1Typical Application Circuit MP2618 Rev. 0.92 www.MonolithicPower.com 2 7/14/2010 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. 2010 MPS. All Rights Reserved.