BATTERY VOLTAGE (V) LTC4058-4.2/LTC4058X-4.2 Standalone Linear Li-Ion Battery Charger with Thermal Regulation in DFN FEATURES DESCRIPTIO n Programmable Charge Current Up to 950mA The LTC 4058 is a complete constant-current/constant- n Complete Linear Charger in DFN Package voltage linear charger for single cell lithium-ion batteries. n No MOSFET, Sense Resistor or Blocking Diode Its DFN package and low external component count make Required the LTC4058 ideally suited for portable applications. Fur- n Thermal Regulation Maximizes Charge Rate thermore, the LTC4058 is designed to work within USB Without Risk of Overheating* power specifications. n Battery Kelvin Sensing Improves Charging Accuracy The LTC4058 can Kelvin sense the battery terminal for n Charges Directly from a USB Port more accurate float voltage charging. No external sense n C/10 Charge Termination resistor or external blocking diode are required due to the n Preset 4.2V Charge Voltage with 1% Accuracy internal MOSFET architecture. Thermal feedback regu- n Charge Current Monitor Output for Gas Gauging* lates the charge current to limit the die temperature during n Automatic Recharge high power operation or high ambient temperature condi- n Charge Status Output tions. The charge voltage is fixed at 4.2V and the charge n AC Present Output current is programmed with a resistor. The LTC4058 n 2.9V Trickle Charge Threshold (LTC4058) terminates the charge cycle when the charge current n Available Without Trickle Charge (LTC4058X) drops to 10% of the programmed value after the final float n Soft-Start Limits Inrush Current voltage is reached. n Low Profile (3mm 3mm 0.75mm) DFN Package When the input supply (wall adapter or USB supply) is U removed, the LTC4058 enters a low current state dropping APPLICATIO S the battery drain current to less than 2m A. Other features include charge current monitor, undervoltage lockout, n Cellular Telephones, PDAs, MP3 Players automatic recharge and status pins to indicate charge n Bluetooth Applications termination and the presence of an input voltage. , LTC and LT are registered trademarks of Linear Technology Corporation. *US Patent 6,522,118 TYPICAL APPLICATIO Complete Charge Cycle (750mAh Battery) 700 4.75 CONSTANT Single Cell Li-Ion Battery Charger with Kelvin Sense CURRENT 600 4.50 CONSTANT 600mA 500 VOLTAGE 4.25 V IN V BAT CC 4.5V TO 6.5V BSENSE 400 4.00 LTC4058-4.2 1-CELL CHRG + 300 3.75 Li-Ion ACPR BATTERY EN PROG 200 3.50 V = 5V GND CC 1F 1.65k q = 40C/W JA 100 3.25 R = 1.65k PROG 405842 TA01 T = 25C A 0 3.00 0 0.25 0.5 0.75 1.0 1.25 1.5 1.75 2.0 2.25 TIME (HOURS) 405842 TA02 sn405842 405842fs 1 CHARGE CURRENT (mA) U ULTC4058-4.2/LTC4058X-4.2 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 NUMBER PROG............................................. 0.3V to V + 0.3V CC BSENSE 1 8 EN BAT, BSENSE.............................................. 0.3V to 7V BAT 2 7 ACPR LTC4058EDD-4.2 9 CHRG, ACPR, EN ...................................... 0.3V to 10V CHRG V 3 6 CC LTC4058XEDD-4.2 BAT Short-Circuit Duration .......................... Continuous GND 4 5 PROG BAT Pin Current ........................................................ 1A DD PART MARKING PROG Pin Current ................................................... 1mA DD PACKAGE 8-LEAD (3mm 3mm) PLASTIC DFN Maximum Junction Temperature .......................... 125 C LAEV T = 125 C, q = 40 C/W (NOTE 3) JMAX JA Operating Temperature Range (Note 2) .. 40 C to 85 C EXPOSED PAD IS GROUND (PIN 9) LBDH MUST BE SOLDERED TO PCB Storage Temperature Range ................. 65 C to 125 C Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS The l denotes specifications which apply over the full operating temperature range, otherwise specifications are at T = 25 C. V = 5V, unless otherwise noted. A CC SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V Input Supply Voltage l 4.25 6.5 V CC I Input Supply Current Charge Mode (Note 4), R = 10k l 0.3 1 mA CC PROG Standby Mode (Charge Terminated) l 200 500 m A Shutdown Mode (EN = 5V, V < V l 25 50 m A CC BSENSE or V < V ) CC UV V Regulated Output (Float) Voltage 0 C T 85 C, 4.3V < V < 6.5V 4.158 4.2 4.242 V FLOAT A CC I BAT Pin Current R = 10k, Current Mode l 93 100 107 mA BAT PROG R = 2k, Current Mode l 465 500 535 mA PROG I BSENSE Pin Current (Note 5) Standby Mode, V = 4.2V l 2.5 6 m A BSENSE BSENSE Shutdown Mode (EN = 5V, V < V or 1 2 m A CC BSENSE V < V ) CC UV Sleep Mode, V = 0V 1 2 m A CC I Trickle Charge Current V < V , R = 2k (Note 6) l 30 45 60 mA TRIKL BSENSE TRIKL PROG V Trickle Charge Threshold Voltage R = 10k, V Rising (Note 6) 2.8 2.9 3 V TRIKL PROG BSENSE V Trickle Charge Hysteresis Voltage R = 10k (Note 6) 60 80 110 mV TRHYS PROG V V Undervoltage Lockout Voltage From V Low to High l 3.7 3.8 3.92 V UV CC CC V V Undervoltage Lockout Hysteresis l 150 200 300 mV UVHYS CC V EN Pin Input Low Voltage l 0.4 0.7 V EN(IL) V EN Pin Input High Voltage l 0.7 1 V EN(IH) R EN Pin Pull-Down Resistor l 1.2 2 5 MW EN V V V Lockout Threshold V from Low to High 70 100 140 mV ASD CC BSENSE CC V from High to Low 5 30 50 mV CC I C/10 Termination Current Threshold R = 10k (I = 100mA) (Note 7) l 0.085 0.10 0.115 mA/mA TERM PROG CHG R = 2k (I = 500mA) l 0.085 0.10 0.115 mA/mA PROG CHG V PROG Pin Voltage R = 10k, Current Mode 0.93 1 1.07 V PROG PROG V CHRG Pin Output Low Voltage I = 5mA 0.35 0.6 V CHRG CHRG V ACPR Pin Output Low Voltage I = 5mA 0.35 0.6 V ACPR ACPR D V Recharge Battery Threshold Voltage V V , 0 C T 85 C 60 100 140 mV RECHRG FLOAT RECHRG A sn405842 405842fs 2 U WWW