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LTC4064

Linear Technology
Part Number LTC4064
Manufacturer Linear Technology
Description Monolithic Linear Charger
Published Mar 27, 2005
Detailed Description LTC4064 Monolithic Linear Charger for Back-Up Li-Ion Batteries U U FEATURES ■ Preset 4V Charge Voltage with 1% Accurac...
Datasheet PDF File LTC4064 PDF File

LTC4064
LTC4064

Overview
LTC4064 Monolithic Linear Charger for Back-Up Li-Ion Batteries U U FEATURES ■ Preset 4V Charge Voltage with 1% Accuracy Prolongs 4.
2V Li-Ion Battery Lifetime ■ Automatic Recharge ■ Thermal Regulation Maximizes Charging Rate without Risk of Overheating* ■ No MOSFET, Sense Resistor or Blocking Diode Required ■ Programmable Charge Termination Timer ■ Thermistor Input for Temperature Qualified Charging ■ Programmable Charge Current with 7% Accuracy ■ C/10 Charge Current Detection Output ■ 25µA Supply Current in Shutdown Mode ■ Charge Current Monitor Useful for Gas Gauging* ■ Charges Directly from USB Port ■ Tiny Thermally Enhanced 10-pin MSOP Package U APPLICATIO S ■ File Servers, RAID Systems ■ Storage Products ■ Li-Ion Battery Back-Up DESCRIPTIO The LTC4064 is a standalone linear charger optimized for prolonging the life of 1-cell Li-ion batteries in battery backup applications.
By charging to a float voltage of 4V instead of 4.
2V or 4.
1V, the LTC4064 decelerates the aging process and capacity degradation when the battery is unused for long periods of time but must be in a ready state.
An external capacitor programs a safety timer to terminate the charge cycle while the charge current is set externally with a single resistor.
When the input supply is removed, the LTC4064 automatically enters a low current sleep mode, dropping the battery drain current to less than 3µA.
Additional safety features designed to maximize battery lifetime and reliability include NTC temperature sensing and low battery charge conditioning (trickle charging).
The IC contains an on-chip power MOSFET and eliminates the need for an external sense resistor and blocking diode.
The LTC4064 also includes C/10 detection circuitry, AC present logic, and fault detection circuitry.
, LTC and LT are registered trademarks of Linear Technology Corporation.
*US Patent No.
6522118 TYPICAL APPLICATIO Standalone Back-Up Li-Ion Battery Charger VIN = 5V 8 2 SHDN VCC 4.
7µF BAT 9 LTC4064 4 TIMER PROG 7...


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