Datasheet

2 Maxim Integrated
1.2A Switch-Mode Li+ Chargers with ±22V Input
Rating and JEITA Battery Temperature Monitoring
MAX8900A/MAX8900B/MAX8900C
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
IN
Too High State ........................................................................23
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