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LT1511 Fiches technique(PDF) 1 Page - Linear Technology |
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LT1511 Fiches technique(HTML) 1 Page - Linear Technology |
1 / 16 page 1 LT1511 Constant-Current/ Constant-Voltage 3A Battery Charger with Input Current Limiting The LT ®1511 current mode PWM battery charger is the simplest, most efficient solution to fast charge modern rechargeable batteries including lithium-ion (Li-Ion), nickel- metal-hydride (NiMH) and nickel-cadmium (NiCd) that require constant-current and/or constant-voltage charg- ing. The internal switch is capable of delivering 3A* DC current (4A peak current). Full-charging current can be programmed by resistors or a DAC to within 5%. With 0.5% reference voltage accuracy, the LT1511 meets the critical constant-voltage charging requirement for Li-Ion cells. A third control loop is provided to regulate the current drawn from the AC adapter. This allows simultaneous operation of the equipment and battery charging without overloading the adapter. Charging current is reduced to keep the adapter current within specified levels. The LT1511 can charge batteries ranging from 1V to 20V. Ground sensing of current is not required and the battery’s negative terminal can be tied directly to ground. A saturat- ing switch running at 200kHz gives high charging effi- ciency and small inductor size. A blocking diode is not required between the chip and the battery because the chip goes into sleep mode and drains only 3 µA when the wall adapter is unplugged. Figure 1. 3A Lithium-Ion Battery Charger SW BOOST COMP1 CLN UV OVP SENSE BAT C1 1 µF RS4 † ADAPTER CURRENT SENSE R7 † 500 Ω R5 † UNDERVOLTAGE LOCKOUT R6 5k VIN (ADAPTER INPUT) 11V TO 28V VBAT 10 µF CPROG 1 µF CIN* 10 µF 300 Ω RPROG 4.93k 1% 0.33 µF 1k C2 0.47 µF RS3 200 Ω 1% RS2 200 Ω 1% L1** 20 µH D2 MBR0540T 200pF RS1 0.033 Ω BATTERY CURRENT SENSE R3 390k 0.25% BATTERY VOLTAGE SENSE R4 162k 0.25% 50pF COUT 22 µF TANT 4.2V 4.2V + + LT1511 NOTE: COMPLETE LITHIUM-ION CHARGER, NO TERMINATION REQUIRED. RS4, R7 AND C1 ARE OPTIONAL FOR IIN LIMITING *TOKIN OR UNITED CHEMI-CON/MARCON CERAMIC SURFACE MOUNT **20 µH COILTRONICS CTX20-4 †SEE APPLICATIONS INFORMATION FOR INPUT CURRENT LIMIT AND UNDERVOLTAGE LOCKOUT VCC TO MAIN SYSTEM POWER SPIN D1 MBRD340 GND CLP 2 Li-Ion D3 MBRD340 1511 • F01 PROG VC + + + , LTC and LT are registered trademarks of Linear Technology Corporation. *See LT1510 for 1.5A Charger s Chargers for NiCd, NiMH, Lead-Acid, Lithium Rechargeable Batteries s Switching Regulators with Precision Current Limit s Simple Design to Charge NiCd, NiMH and Lithium Rechargeable Batteries—Charging Current Programmed by Resistors or DAC s Adapter Current Loop Allows Maximum Possible Charging Current During Computer Use s Precision 0.5% Accuracy for Voltage Mode Charging s High Efficiency Current Mode PWM with 4A Internal Switch s 5% Charging Current Accuracy s Adjustable Undervoltage Lockout s Automatic Shutdown When AC Adapter is Removed s Low Reverse Battery Drain Current: 3 µA s Current Sensing Can Be at Either Terminal of the Battery s Charging Current Soft-Start s Shutdown Control FEATURES DESCRIPTIO APPLICATIO S TYPICAL APPLICATIO |
Numéro de pièce similaire - LT1511 |
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Description similaire - LT1511 |
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