EVALUATION KIT AVAILABLE MAX8900A/MAX8900B/MAX8900C 1.2A Switch-Mode Li+ Chargers with 22V Input Rating and JEITA Battery Temperature Monitoring General Description Features The MAX8900 is a high-frequency, switch-mode char- S 3.25MHz Switching Li+/Li-Poly Battery Charger ger for a 1-cell lithium ion (Li+) or lithium polymer S JEITA Battery Temperature Monitor Adjusts (Li-Poly) battery. It delivers up to 1.2A of current to the Charge Current and Termination Voltage battery from 3.4V to 6.3V (MAX8900A/MAX8900C) or S 4.2V 0.5% Battery Regulation Voltage (Alternate 3.4V to 8.7V (MAX8900B). The 3.25MHz switch-mode 4.1V Target Available on Request) charger is ideally suited to small portable devices such S Adjustable Done Current Threshold as headsets and ultra-portable media players because it minimizes component size and heat. Adjustable from 10mA to 200mA 1mA Accuracy at 10mA Several features make the MAX8900 perfect for high- S High-Efficiency and Low Heat reliability systems. The MAX8900 is protected against input voltages as high as +22V and as low as -22V. S Uses a 2.0mm x 1.6mm Inductor Battery protection features include low voltage prequali- S Positive and Negative Input Voltage Protection fication, charge fault timer, die temperature monitoring, (22V) and battery temperature monitoring. The battery temper- S Up to +20V Operating Range (Alternate OVLO ature monitoring adjusts the charge current and termina- Ranges Available on Request) tion voltage as described in the JEITA* specification for safe use of secondary lithium-ion batteries. S Supports No-Battery Operation Charge parameters are easily adjustable with external S Fault Timer components. An external resistance adjusts the charge S Charge Status Outputs current from 50mA to 1200mA. Another external resis- S 2.44mm x 2.67mm x 0.64mm Package tance adjusts the prequalification and done current thresholds from 10mA to 200mA. The done current thresh- Simplified Applications Circuit old is very accurate achieving Q1mA at the 10mA level. The charge timer is adjustable with an external capacitor. 1FH The MAX8900 is available in a 0.4mm pitch, 2.44mm x 2.67mm x 0.64mm WLP package. BST CS Applications LX BAT USB Charging Digital Cameras V 2.2FF IN IN Headsets and Media GPS, PND (-22V TO +22V) 6.3V 0.47FF PGND SYSTEM 0603 Players eBook 25V LOAD MAX8900 0603 AVL Smartphones STAT1 GND STAT2 Li+/ Ordering Information (continued) STAT3 Li-POLY OFF CEN THM TEMP PIN- ON PART OPTIONS RANGE PACKAGE T PVL V = 6.5V INBP OVLO 1.0FF 0.47FF CT SETI DNI -40NC to T1 = 0NC 6.3V 25V MAX8900AEWV+T 30 WLP +85NC 2-pin status indicators 0402 0603 V = 2.8V PQUTH V = 9.0V OVLO -40NC to T1 = -15NC MAX8900BEWV+T 30 WLP +85NC 3-pin status indicators *JEITA (Japan Electronics and Information Technology V = 2.8V PQUTH Industries Association) standard, A Guide to the Safe Use +Denotes a lead(Pb)-free/RoHS-compliant package. of Secondary Lithium Ion Batteries in Notebook-type Personal T = Tape and reel. Computers April 20, 2007. Ordering Information continued at end of data sheet. For pricing, delivery, and ordering information, please contact Maxim Direct 19-5063 Rev 4 11/14 at 1-888-629-4642, or visit Maxims website at www.maximintegrated.com.MAX8900A/MAX8900B/MAX8900C 1.2A Switch-Mode Li+ Chargers with 22V Input Rating and JEITA Battery Temperature Monitoring TABLE OF CONTENTS Absolute Maximum Ratings ................ 4 Electrical Characteristics .................. 4 Typical Operating Characteristics ............... 8 Pin Configuration ................... 13 Pin Description ................... 13 Detailed Description................... 17 Control Scheme............................................................................. 17 Soft-Start .................................................................................. 17 Setting the Fast-Charge Current (SETI) .......................................................... 17 Setting the Prequalification Current and Done Threshold (DNI)........................................ 18 Charge Enable Input (CEN) ................................................................... 18 Charger States ............................................................................. 19 Charger Disabled State ....................................................................22 Dead-Battery State........................................................................22 Dead Battery + Prequalification State .........................................................22 Prequalification State ......................................................................22 Fast-Charge Constant Current State ..........................................................22 Fast-Charge Constant Voltage State ..........................................................22 Top-Off State ............................................................................22 Done State ..............................................................................23 Timer Fault State .........................................................................23 Battery Hot/Cold State .....................................................................23 V Too High State ........................................................................23 IN Charge Timer (CT) ..........................................................................23 Thermal Management ........................................................................23 Thermistor Monitor (THM) .................................................................. 24 Thermal Foldback ........................................................................26 Thermal Shutdown ........................................................................26 PVL and AVL Regulator.......................................................................27 Charge Status Outputs (3 Pin) ................................................................. 27 Charge Status Outputs (2 Pin + > T4)............................................................ 27 Inductor Selection ...........................................................................28 BAT Capacitor ..............................................................................29 INBP Capacitor .............................................................................29 Other Capacitors............................................................................29 Applications Information.................. 30 Dynamic Charge Current Programming ..........................................................30 No-Battery Operation ........................................................................30 2 Maxim Integrated