LTC1733 Monolithic Linear Lithium-Ion Battery Charger with Thermal Regulation FEATURES DESCRIPTIO n Complete Linear Charger for 1-Cell Lithium-Ion The LTC 1733 is a standalone constant-current/ Batteries constant-voltage linear charger for lithium-ion batteries n Thermal Regulation Maximizes Charging Rate with an on-chip power MOSFET. Internal thermal feedback without Risk of Overheating* regulates the charge current to limit die temperature n No External MOSFET, Sense Resistor or Blocking during high power operation or high ambient temperature Diode Required conditions. This feature allows the user to program a high n Up to 1.5A Charge Current charge current without risk of damaging the LTC1733 or n Preset Charge Voltage with 1% Accuracy the handheld product. n Programmable Charge Current with 7% Accuracy No external current sense resistor is needed and no n Programmable Charge Termination Timer blocking diode is required due to the internal MOSFET n Tiny Thermally Enhanced 10-Pin MSOP Package architecture. The charge current and charge time can be n Charge Current Monitor Useful for Gas Gauging* set externally with a single resistor and capacitor, respec- n C/10 Charge Current Detection Output tively. When the input supply (wall adapter) is removed, n Automatic Recharge the LTC1733 automatically enters a low current sleep n Thermistor Input for Temperature Qualified Charging mode, dropping the battery drain current to less than 5m A. n AC Present Logic Output n The LTC1733 also includes NTC temperature sensing, 4.1V/4.2V Pin Selectable Output Voltage C/10 detection circuitry, AC present logic, 4.1V/4.2V pin U selectability and low battery charge conditioning (trickle APPLICATIO S charging). n Cellular Telephones The LTC1733 is available in a 10-pin thermally enhanced n Handheld Computers MSOP package. n Digital Still Cameras , LTC and LT are registered trademarks of Linear Technology Corporation. n *Patent Pending Charging Docks and Cradles TYPICAL APPLICATIO Charge Current vs Battery Voltage Standalone Li-Ion Battery Charger 1200 T = 0C CONSTANT A V = 5V IN CURRENT 1000 T = 40C 8 2 A 800 T = 25C A SEL V CC I = 1A BAT 9 CONSTANT 4.7F BAT 600 POWER 4.2V LTC1733 4 7 1-CELL TIMER PROG CONSTANT Li-Ion 400 VOLTAGE GND NTC BATTERY* 1.5k 5 6 1% 0.1F TRICKLE 200 CHARGE V = 5V IN 1733TA01 q = 40C/W JA 0 2 2.5 3 3.5 4 4.5 *AN OUTPUT CAPACITOR MAY BE REQUIRED BATTERY VOLTAGE (V) 1733 TA01b DEPENDING ON BATTERY LEAD LENGTH sn1733 1733fs 1 CHARGE CURRENT (mA) U ULTC1733 UUW ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1) Input Supply Voltage (V ) ........................................ 7V ORDER PART TOP VIEW CC CHRG 1 10 ACPR BAT ............................................................................ 7V NUMBER V 2 9 BAT CC NTC, SEL, TIMER, PROG ................ 0.3V to V + 0.3V FAULT 3 8 SEL CC TIMER 4 7 PROG LTC1733EMSE CHRG, FAULT, ACPR ................................... 0.3V to 7V GND 5 6 NTC BAT Short-Circuit Duration ...........................Continuous MSE EXPOSED PAD PACKAGE 10-LEAD PLASTIC MSOP MSE PART MARKING BAT Current (Note 2) .............................................. 1.6A T = 125 C, q = 40 C/W (Note 4) JMAX JA PROG Current (Note 2) ........................................ 1.6mA EXPOSED PAD IS GROUND. LTLX (MUST BE SOLDERED TO PCB Junction Temperature........................................... 125 C FOR MAXIMUM HEAT TRANSFER). Operating Temperature Range (Note 3) ...40 C to 85 C Consult LTC Marketing for parts specified with wider operating temperature ranges. Storage Temperature Range ................. 65 C to 150 C Lead Temperature (Soldering, 10 sec).................. 300 C ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25 C. V = 5V A CC SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V V Supply Voltage l 4.5 6.5 V CC CC I V Supply Current Charger On Current Mode R = 30k (Note 5) l 13 mA CC CC PROG Shutdown Mode V = 3V l 0.9 2 mA PROG V V Regulated Output Voltage SEL = 0V l 4.059 4.1 4.141 V BAT BAT l 4.158 4.2 4.242 V SEL = V CC I Battery Pin Current R = 3k Current Mode l 465 500 535 mA BAT PROG R = 1k Current Mode 1.395 1.5 1.605 A PROG Shutdown Mode V = 3V 1 5 m A PROG Sleep Mode V < V or V < (V D V ) 1 5 m A CC BAT CC UV UV I Trickle Charge Current V < 2V R = 3k l 35 50 65 mA TRIKL BAT PROG V Trickle Charge Trip Threshold V Rising 2.48 V TRIKL BAT D V Trickle Charge Trip Hysteresis 100 mV TRIKL V V Undervoltage Lockout Voltage V Rising l 4.2 4.5 V UV CC CC D V V Undervoltage Lockout Hysteresis 150 mV UV CC V Manual Shutdown Threshold Voltage PROG Pin Voltage Rising 2.15 V MSD V Manual Shutdown Hysteresis Voltage 100 mV MSD-HYS V Automatic Shutdown Threshold Voltage (V - V ) Voltage Falling 30 mV ASD CC BAT (V - V ) Voltage Rising 60 mV CC BAT sn1733 1733fs 2 U WWW