BATTERY VOLTAGE (V) LTC4059/LTC4059A 900mA Linear Li-Ion Battery Chargers with Thermal Regulation in 2 2 DFN FEATURES DESCRIPTIO Programmable Charge Current Up to 900mA The LTC 4059/LTC4059A are constant-current/constant- Charge Current Monitor Output for Charge voltage linear chargers for single cell lithium-ion batteries. Termination Their 2mm 2mm DFN package and low external compo- Constant-Current/Constant-Voltage Operation with nent count make these chargers especially well suited for Thermal Regulation to Maximize Charging Rate portable applications. Furthermore, they are designed to Without Risk of Overheating work within USB power specifications. Constant-Current Source Mode for Charging No external sense resistor, MOSFET or blocking diode is Nickel Batteries (LTC4059 Only) required. Thermal feedback regulates the charge current ACPR Pin Indicates Presence of Input Supply to limit the die temperature during high power operation or (LTC4059A Only) high ambient thermal conditions. The charge voltage is No External MOSFET, Sense Resistor or Blocking fixed at 4.2V and the charge current is programmable. Diode Required When the input supply (wall adapter or USB supply) is Operating Supply Voltage from 3.75V to 8V removed, the LTC4059/LTC4059A automatically enter a low Charges Single Cell Li-Ion Batteries Directly from current state, dropping the battery current drain to less than USB Port 1A. With power applied, they can be put into shutdown Preset 4.2V Charge Voltage with 0.6% Accuracy mode, reducing the supply current to 10A. 10A Supply Current in Shutdown Mode Tiny 6-Lead (2mm 2mm) DFN Package The LTC4059A features an open-drain status pin to indi- U cate the presence of an input voltage. The LTC4059 can be APPLICATIO S used as a constant-current source to charge Nickel cells. Other features include undervoltage lockout protection Wireless PDAs and a current monitor pin which can indicate when to Cellular Phones terminate a charge cycle. Portable Electronics Wireless Headsets The LTC4059/LTC4059A are available in a 6-lead, low Digital Cameras profile (0.75mm) 2mm 2mm DFN package. , LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 6522118. Complete Charge Cycle (800mAh Battery) TYPICAL APPLICATIO 700 4.4 CONSTANT CONSTANT CURRENT VOLTAGE V DD 600 4.2 V IN 4.5V TO 8V 50k 500 4.0 V ACPR P CC 400 3.8 LTC4059A 600mA EN BAT 300 3.6 1F GND PROG 4.2V + 200 3.4 2k Li-Ion BATTERY V = 5V CC 4059 TA01 100 3.2 R = 2k PROG T = 25C A 0 3.0 0 0.5 1 1.5 2 2.5 TIME (HOURS) 4059 TA02 4059fb 1 CHARGE CURRENT (mA) U ULTC4059/LTC4059A UUW ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1) TOP VIEW Input Supply Voltage (V ) ...................... 0.3V to 10V ORDER PART CC BAT, PROG, EN, Li CC, ACPR ................... 0.3V to 10V NUMBER GND 1 6 EN BAT Short-Circuit Duration ...........................Continuous Li CC/ACPR* 2 7 5 PROG LTC4059EDC BAT Pin Current ............................................... 1000mA LTC4059AEDC BAT 3 4 V CC PROG Pin Current ............................................. 1000A Junction Temperature.......................................... 125C DC6 PACKAGE DC6 PART 6-LEAD (2mm 2mm) PLASTIC DFN Operating Temperature Range (Note 2) .. 40C to 85C MARKING T = 125C, = 60C/W TO 85C/W (NOTE 3) JMAX JA Storage Temperature Range ................. 65C to 125C *Li CC PIN 2 ON LTC4059EDC, ACPR PIN 2 ON LTC4059AEDC LAFU EXPOSED PAD (PIN 7) IS GND LBJH MUST BE SOLDERED TO PCB Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25C. V = 5V unless otherwise noted. A CC SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V V Supply Voltage 3.75 8 V CC CC I Quiescent V Supply Current V = 4.5V (Forces I and I = 0) 25 60 A CC CC BAT BAT PROG I V Supply Current in Shutdown V = V 10 25 A CCMS CC EN CC I V Supply Current in Undervoltage V < V V = 3.5V, V = 4V 410 A CCUV CC CC BAT CC BAT Lockout V V Regulated Output Voltage I = 2mA 4.175 4.2 4.225 V FLOAT BAT BAT 4.5V < V < 8V, I = 2mA 4.158 4.2 4.242 V CC BAT I BAT Pin Current R = 2.43k, Current Mode, V = 3.8V 475 500 525 mA BAT PROG BAT R = 12.1k, Current Mode, V = 3.8V 94 100 106 mA PROG BAT I Battery Drain Current in Shutdown V = V , V > V 0 1 A BMS EN CC CC BAT I Battery Drain Current in Undervoltage V < V , V = 4V 014 A BUV CC BAT BAT Lockout V V V Undervoltage Lockout V from Low to High, V = 3.7V 100 150 200 mV UV CC BAT CC BAT Threshold V from High to Low, V = 3.7V 035 80 mV CC BAT V PROG Pin Voltage R = 2.43k, I = 500A 1.18 1.21 1.24 V PROG PROG PROG R = 12.1k, I = 100A 1.18 1.21 1.24 V PROG PROG V Manual Shutdown Threshold V Increasing 0.3 0.92 1.2 V MS EN V Manual Shutdown Hysteresis V Decreasing 85 mV MSHYS EN R EN Pin Input Resistance V = 5V 1 1.85 3 M EN EN V Voltage Mode Disable Threshold V Increasing (LTC4059 Only) 0.3 0.92 1.2 V Li CC Li CC V Voltage Mode Disable Hysteresis V Decreasing (LTC4059 Only) 85 mV Li CCHYS Li CC V ACPR Pin Output Low Voltage I = 300A (LTC4059A Only) 0.25 0.5 V ACPR ACPR t Junction Temperature In Constant 115 C LIM Temperature Mode R Power FET ON Resistance I = 150mA (Note 4) 800 1200 m ON BAT (Between V and BAT) CC Note 1: Absolute Maximum Ratings are those values beyond which the life Note 3: Failure to solder the exposed backside of the package to the PC of a device may be impaired. board ground plane will result in a thermal resistance much higher than 60C/W. Note 2: The LTC4059E/LTC4059AE are guaranteed to meet performance specifications from 0C to 70C. Specifications over the 40C to 85C Note 4: The FET on-resistance is guaranteed by correlation to wafer level operating temperature range are assured by design, characterization and measurements. correlation with statistical process controls. 4059fb 2 U WWW