V (V) BAT LTC4079 60V, 250mA Linear Charger with Low Quiescent Current FEATURES DESCRIPTION n Wide Input Voltage Range: 2.7V to 60V The LTC 4079 is a low quiescent current, high voltage linear n Adjustable Battery Voltage: 1.2V to 60V charger for most battery chemistry types including Li-Ion/ n Adjustable Charge Current: 10mA to 250mA Polymer, LiFePO , Lead-Acid or NiMH battery stacks up 4 n Low Quiescent Current While Charging: I = 4A to 60V. The maximum charge current is adjustable from IN n Ultralow Battery Drain When Shutdown or Charged: 10mA to 250mA with an external resistor. The battery n I < 0.01A charge voltage is set using an external resistordivider. BAT n Auto Recharge With an integrated power device, current sensing and n Input Voltage Regulation for High Impedance Sources reverse current protection, a complete charging solution n Thermal Regulation Maximizes Output Current with- using the LTC4079 requires very few external components. out Overheating Thermal regulation ensures maximum charge current n Constant Voltage Feedback with 0.5% Accuracy up to the specified limit without the risk of overheating. n NTC Thermistor Input for Temperature Qualified Charging can be terminated by either C/10 or adjustable Charging timer. n Adjustable Safety Timer n Input voltage regulation reduces charge current when the Charging Status Indication n input voltage falls to an adjustable level or the battery Thermally Enhanced 10-Lead (3mm 3mm) voltage, making it well suited for energy harvesting DFN Package n applications. Other features include temperature qualified AEC-Q100 Qualified for Automotive Applications charging, bad battery detection, automatic recharge with sampled feedback in standby for negligible battery drain, APPLICATIONS and an open-drain CHRG status output. The device is n Embedded Automotive and Industrial offered in a compact, thermally enhanced 10-lead (3mm n Backup Battery Charging from Another Battery 3mm) DFN package. n Energy Harvesting Charger All registered trademarks and trademarks are the property of their respective owners. n Thin Film Battery Products TYPICAL APPLICATION Li-Ion Battery Charge Cycle Charging a Backup Battery 140 8.6 500mAh 2-CELL LI-ION V BAT 9V TO 60V IN BAT 8.4V 120 8.4 1F 1.54M LTC4079 I BAT 100 8.2 EN FB 249k 80 8.0 CHRG FBG 60 7.8 PROG NTCBIAS 3.01k 10k C/10 40 7.6 TERMINATION TIMER NTC GND + 20 7.4 T 10k Li-Ion 0 7.2 1 2 8 0 3 4 5 6 7 4079 TA01a TIME (HOURS) 4079 TA01b Rev. A 1 Document Feedback For more information www.analog.com I (mA) BATLTC4079 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Notes 1, 2) TOP VIEW IN, BAT, EN, CHRG, FB, FBG Voltage .......... 0.3V to 62V PROG TIMER Voltage ..................................................3V IN 1 10 BAT EN 2 9 FB BAT Current....................................................... 400mA 11 PROG 3 8 FBG GND PROG Current .....................................................1.6mA NTCBIAS 4 7 CHRG FBG Current .............................................................2mA NTC 5 6 TIMER CHRG Current ..........................................................2mA DD PACKAGE Operating Junction Temperature Range 10-LEAD (3mm 3mm) PLASTIC DFN T = 125C, = 43C/W JMAX JA (Notes 3, 5) ................................................ 40 to 125C EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB Storage Temperature Range ......................65 to 150C ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC4079EDD PBF LTC4079EDD TRPBF LGNQ 10-Lead (3mm 3mm) Plastic DFN 40C to 125C LTC4079IDD PBF LTC4079IDD TRPBF LGNQ 10-Lead (3mm 3mm) Plastic DFN 40C to 125C AUTOMOTIVE PRODUCTS** LTC4079EDD WPBF LTC4079EDD WTRPBF LGNQ 10-Lead (3mm 3mm) Plastic DFN 40C to 125C LTC4079IDD WPBF LTC4079IDD WTRPBF LGNQ 10-Lead (3mm 3mm) Plastic DFN 40C to 125C Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with TRMPBF suffix. **Versions of this part are available with controlled manufacturing to support the quality and reliability requirements of automotive applications. These models are designated with a W suffix. Only the automotive grade products shown are available for use in automotive applications. Contact your local Analog Devices account representative for specific product ordering information and to obtain the specific Automotive Reliability reports for thesemodels. Rev. A 2 For more information www.analog.com