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LTC4085-4 Datasheet(PDF) 1 Page - Linear Technology |
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LTC4085-4 Datasheet(HTML) 1 Page - Linear Technology |
1 / 24 page LTC4085-3/LTC4085-4 1 408534fb USB Power Manager with Ideal Diode Controller and 3.95V Li-Ion Charger The LTC®4085-3/LTC4085-4 is a USB power manager and Li-Ion/Polymer battery charger designed for portable battery-powered applications. The part controls the total current used by the USB peripheral for operation and battery charging. The total input current can be limited to 20% or 100% of a programmed value up to 1.5A (typically 100mA or 500mA). Battery charge current is automati- cally reduced such that the sum of the load current and charge current does not exceed the programmed input current limit. The LTC4085-3/LTC4085-4 includes a complete constant- current/constant-voltage linear charger for single cell Li-Ion batteries. These 3.95V versions of the standard LTC4085 are intended for applications which have extended battery lifetime requirements or those that require high temperature (approximately >60°C) operation or storage. Under these conditions, a reduced float voltage will trade-off initial cell capacity for the benefit of increased capacity retention over the life of the battery. A reduced float voltage also minimizes swelling in prismatic and polymer cells, and avoids open CID (pressure fuse) in cylindrical cells. The LTC4085-3/LTC4085-4 also includes a programmable termination timer, automatic recharging, an end-of-charge status output and an NTC thermistor. ■ Portable USB Devices ■ Seamless Transition Between Input Power Sources: Li-Ion/Polymer Battery, USB and 5V Wall Adapter ■ 215mΩ Internal Ideal Diode Plus Optional External Ideal Diode Controller Provide Low Loss PowerPath™ When Wall Adapter/USB Input Not Present ■ Load Dependent Charging Guarantees Accurate USB Input Current Compliance ■ 3.95V Float Voltage Improves Battery Life Span and High Temperature Safety Margin ■ Constant-Current/Constant-Voltage Operation with Thermal Feedback to Maximize Charging Rate without Risk of Overheating* ■ Selectable 100% or 20% Input Current Limit (e.g., 500mA/100mA) ■ Battery Charge Current Independently Programmable Up to 1.2A ■ Automatic Output Undervoltage Charge Current Reduction (LTC4085-3) ■ Tiny (4mm × 3mm × 0.75mm) 14-Lead DFN Package Input and Battery Current vs Load Current RPROG = 100k, RCLPROG = 2k FEATURES DESCRIPTION APPLICATIONS TYPICAL APPLICATION L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Bat-Track, PowerPath and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 6522118, 6700364. Other patents pending. ILOAD (mA) 0 600 500 400 300 200 100 0 –100 300 500 408534 TA01b 100 200 400 600 ILOAD IIN IBAT (CHARGING) IBAT (DISCHARGING) WALL = 0V IN SUSP HPWR PROG CLPROG NTC VNTC WALL ACPR OUT GATE BAT CHRG TIMER LTC4085-3/ LTC4085-4 GND + 0.1μF 4.7μF TO LDOs, REGs, ETC 10k 10k 2k 100k 5V WALL ADAPTER INPUT 5V (NOM) FROM USB CABLE VBUS 4.7μF SUSPEND USB POWER 100mA 500mA SELECT 1k 510Ω 408534 TA01 * * OPTIONAL - TO LOWER IDEAL DIODE IMPEDANCE IIN ILOAD IBAT |
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