Datasheet

3Maxim Integrated
1.2A Switch-Mode Li+ Chargers with ±22V Input
Rating and JEITA Battery Temperature Monitoring
MAX8900A/MAX8900B/MAX8900C
TABLE OF CONTENTS (continued)
LIST OF FIGURES
Figure 1. Applications Circuit: Single SETI Resistor, Status Indicators Connected to LEDs .................... 15
Figure 2. Applications Circuit: Multiple Charge Rates Managed by µP to Be USB Compliant, Status Indicators
Connected to a µP ............................................................................ 15
Figure 3. Functional Diagram .................................................................... 16
Figure 4. Fast-Charge Current vs. R
SETI
(www.maximintegrated.com/tools/other/software/MAX8900-RSETI.XLS) 18
Figure 5. Prequalification Current and Done Threshold vs. R
DNI
(www.maximintegrated.com/tools/other/software/
MAX8900-DNI.XLS).................................................................... 18
Figure 6. Li+/Li-Poly Charge Profile ............................................................... 19
Figure 7. Charger State Diagram (3-Pin Status) ...................................................... 20
Figure 8. Charger State Diagram (2-Pin Status)...................................................... 21
Figure 9. Charge Times vs. C
CT .................................................................................... 23
Figure 10. JEITA Battery Safety Regions ........................................................... 25
Figure 11. Thermistor Monitor Detail............................................................... 26
Figure 12. Charge Current vs. Junction Temperature ................................................. 26
Figure 13. Calculated Fast-Charge Current vs. Dropout Voltage.......................................... 29
Figure 14. Power PCB Layout Example ............................................................ 32
Figure 15. Recommended Land Pattern ........................................................... 33
Figure 16. Bump Cross Section and Copper Pillar Detail .............................................. 33
LIST OF TABLES
Table 1. 2.44mm x 2.67mm x 0.64mm, 0.4mm Pitch WLP Thermal Characteristics .......................... 24
Table 2. Trip Temperatures for Different Thermistors .................................................. 25
Table 3. 3-Pin Status Output Truth Table ........................................................... 27
Table 4. 2-Pin Status Output Truth Table ........................................................... 27
Table 5. Recommended Inductor Selection......................................................... 28
Table 6. Recommended Inductor................................................................. 28
Charge-Source Issues .......................................................................30
Charge-Source Impedance .................................................................30
Inductive Kick............................................................................30
Overvoltage and Reverse Input Voltage Protection ...............................................31
PCB Layout ................................................................................31
Chip Information .............................................................................. 33
Package Information...........................................................................34
Revision History .............................................................................. 35