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LM3655 Datasheet(PDF) 2 Page - National Semiconductor (TI) |
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LM3655 Datasheet(HTML) 2 Page - National Semiconductor (TI) |
2 / 21 page Table of Contents 1.0 General Description ..................................................................................................................................... 1 2.0 Key Specifications ........................................................................................................................................ 1 3.0 Features ....................................................................................................................................................... 1 4.0 Applications .................................................................................................................................................. 1 5.0 Typical Application Circuit ............................................................................................................................ 1 6.0 Connection Diagrams and Package Marking .............................................................................................. 3 7.0 LM3655 Pin Description ............................................................................................................................... 3 8.0 Ordering Information .................................................................................................................................... 4 9.0 Operation Description .................................................................................................................................. 4 10.0 Pin Functions ............................................................................................................................................. 4 10.1 V IN ............................................................................................................................................................ 4 10.2 CELL ........................................................................................................................................................ 4 10.3 RADIO_B+ ............................................................................................................................................... 4 10.4 V DETECT ................................................................................................................................................... 5 10.5 DISABLE ................................................................................................................................................. 5 10.6 CHEMISTRY ............................................................................................................................................ 5 10.7 HIB_EN .................................................................................................................................................... 5 10.8 HIS_DIS ................................................................................................................................................... 5 10.9 BATT_DETB ............................................................................................................................................ 5 10.10 CHRG_STATE ....................................................................................................................................... 5 10.11 CHRG_DET ........................................................................................................................................... 5 10.12 CNTRL ................................................................................................................................................... 5 10.13 EXT_PWR_ON ...................................................................................................................................... 6 11.0 Charge Control Functions .......................................................................................................................... 6 11.1 GENERAL OPERATION .......................................................................................................................... 6 11.2 EXTERNAL POWER SUPPLY DETECT ................................................................................................. 6 11.2.1 V DETECT Circuit ................................................................................................................................... 6 11.2.2 Debounce Function ............................................................................................................................ 7 11.2.3 Power Supply Test Pulses ................................................................................................................. 8 11.2.4 Low Cell Voltage Charging (Pre-Charging) ....................................................................................... 9 11.2.5 Full-Rate Charging ........................................................................................................................... 10 11.2.6 Trickle/Top-Off Mode ........................................................................................................................ 11 11.2.7 Peak Detector Function .................................................................................................................... 11 12.0 Discharge Control Functions .................................................................................................................... 12 12.1 GENERAL DESCRIPTION .................................................................................................................... 12 12.2 RADIO+ GENERATION ........................................................................................................................ 12 12.3 UNDER-VOLTAGE CUT-OFF ............................................................................................................... 13 12.4 POWER CUT OPERATION .................................................................................................................. 13 12.5 HIBERNATION MODE .......................................................................................................................... 13 13.0 Safety Functions ...................................................................................................................................... 13 13.1 INPUT OVER-VOLTAGE PROTECTION .............................................................................................. 13 13.1.1 Normal Operation (Q1 Control) ....................................................................................................... 13 13.1.2 Safety Shunt/Crowbar Operation ..................................................................................................... 14 13.1.3 Standby Shunt Mode ....................................................................................................................... 14 13.1.4 Thermal Crowbar Mode ................................................................................................................... 14 13.1.5 Fast Shunt Operation ...................................................................................................................... 14 13.1.6 Shunt Circuit Parametric Specifications .......................................................................................... 14 13.2 SCHOTTKY ELIMINATION MODE (CHARGER INPUT SHORT CIRCUIT/REVERSE CURRENT PRO- TECTION) ...................................................................................................................................................... 15 13.3 REVERSE CHARGER PROTECTION .................................................................................................. 15 13.4 OUTPUT CURRENT OVERLOAD PROTECTION (“PTC” MODE) ...................................................... 15 13.5 OUTPUT SHORT CIRCUIT CURRENT PROTECTION ....................................................................... 15 14.0 Required External Components ............................................................................................................... 17 14.1 CHARGE PASS TRANSISTOR (Q1) ....................................................................................................17 14.2 DRIVER TRANSISTOR AND BIAS RESISTORS (R2, R3 AND R5) .................................................... 17 14.3 EXTERNAL CHARGER SENSE RESISTOR (R4) ................................................................................ 17 14.4 CAPACITORS ........................................................................................................................................ 17 14.5 FUSE (F1) ............................................................................................................................................. 17 15.0 Electrical Characteristics .......................................................................................................................... 17 15.1 GENERAL SPECIFICATION AND ABSOLUTE MAXIMUM RATINGS ................................................ 17 15.2 PASS DEVICE AND POWER SUPPLY RATINGS ............................................................................... 18 15.3 IC PIN ELECTRICAL CHARACTERISTICS ......................................................................................... 18 www.national.com 2 |
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