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LT1511 Dataheets PDF



Part Number LT1511
Manufacturers Linear Technology
Logo Linear Technology
Description Constant-Current/ Constant-Voltage 3A Battery Charger with Input Current Limiting
Datasheet LT1511 DatasheetLT1511 Datasheet (PDF)

FEATURES s LT1511 Constant-Current/ Constant-Voltage 3A Battery Charger with Input Current Limiting DESCRIPTIO 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), nickelmetal-hydride (NiMH) and nickel-cadmium (NiCd) that require constant-current and/or constant-voltage charging. The internal switch is capable of delivering 3A* DC current (4A peak current). Full-charging current can be .

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FEATURES s LT1511 Constant-Current/ Constant-Voltage 3A Battery Charger with Input Current Limiting DESCRIPTIO 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), nickelmetal-hydride (NiMH) and nickel-cadmium (NiCd) that require constant-current and/or constant-voltage charging. 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 saturating switch running at 200kHz gives high charging efficiency 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 3µA when the wall adapter is unplugged. R7† 500Ω C1 1µF D3 MBRD340 RS4† ADAPTER CURRENT SENSE VIN (ADAPTER INPUT) 11V TO 28V TO MAIN SYSTEM POWER R5† UNDERVOLTAGE LOCKOUT R6 5k 300Ω 1k 0.33µF CPROG 1µF RPROG 4.93k 1% s s s s s s s s s s Simple Design to Charge NiCd, NiMH and Lithium Rechargeable Batteries—Charging Current Programmed by Resistors or DAC Adapter Current Loop Allows Maximum Possible Charging Current During Computer Use Precision 0.5% Accuracy for Voltage Mode Charging High Efficiency Current Mode PWM with 4A Internal Switch 5% Charging Current Accuracy Adjustable Undervoltage Lockout Automatic Shutdown When AC Adapter is Removed Low Reverse Battery Drain Current: 3µA Current Sensing Can Be at Either Terminal of the Battery Charging Current Soft-Start Shutdown Control U APPLICATIO S s s Chargers for NiCd, NiMH, Lead-Acid, Lithium Rechargeable Batteries Switching Regulators with Precision Current Limit , LTC and LT are registered trademarks of Linear Technology Corporation. *See LT1510 for 1.5A Charger TYPICAL APPLICATIO D1 MBRD340 L1** 20µH GND SW BOOST LT1511 COMP1 200pF SPIN OVP SENSE CLP CLN VCC C2 0.47µF + 10µF + CIN* 10µF D2 MBR0540T UV PROG VC BAT RS2 200Ω 1% 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 **20µH COILTRONICS CTX20-4 †SEE APPLICATIONS INFORMATION FOR INPUT CURRENT LIMIT AND UNDERVOLTAGE LOCKOUT RS3 200Ω 1% RS1 0.033Ω BATTERY CURRENT SENSE R3 390k 0.25% BATTERY VOLTAGE SENSE R4 162k 0.25% + COUT 22µF TANT 50pF Figure 1. 3A Lithium-Ion Battery Charger U U + 4.2V + 4.2V VBAT 2 Li-Ion 1511 • F01 1 LT1511 ABSOLUTE MAXIMUM RATINGS (Note 1) PACKAGE/ORDER INFORMATION TOP VIEW GND** 1 SW 2 BOOST 3 GND** 4 GND** 5 UV 6 GND** 7 OVP 8 CLP 9 CLN 10 COMP1 11 SENSE 12 24 GND** 23 GND** 22 VCC1* 21 VCC2* 20 VCC3* 19 PROG 18 VC 17 UVOUT 16 GND** 15 COMP2 14 BAT 13 SPIN Supply Voltage (VMAX, CLP and CLN Pin Voltage) ...................... 30V Switch Voltage with Respect to GND ...................... – 3V Boost Pin Voltage with Respect to VCC ................... 25V Boost Pin Voltage with Respect to GND ................. 57V Boost Pin Voltage with Respect to SW Pin .............. 30V VC, PROG, OVP Pin Voltage ...................................... 8V IBAT (Average)........................................................... 3A Switch Current (Peak) .............................................. 4A Operating Junction Temperature Range Commercial ........................................... 0°C to 125°C Industrial ......................................... – 40°C to 125°C Operating Ambient Temperature Commercial ............................................ 0°C to 70°C Industrial ........................................... – 40°C to 85°C Storage Temperature Range ................. – 65°C to 150°C Lead Temperature (Soldering, 10 sec).................. 300°C ORDER PART NUMBER LT1511CSW LT1511ISW *ALL VCC PINS SHOULD BE CONNECTED TOGETHER CLOSE TO THE PINS ** ALL GND PINS ARE FUSED TO INTERNAL DIE ATTACH PADDLE FOR HEAT SINKING. CONNECT THESE PINS TO EXPANDED PC LANDS FOR PROPER HEAT SINKING. 30°C/W THERMAL RESISTANCE ASSUMES AN INTERNAL GROUND PLANE DOUBLING AS A HEAT SPREADER SW PACKAGE 24-LEAD PLASTIC SO WIDE TJMAX = 125°C, θJA = 30°C/ W** Consult factory for Military grade parts. The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 16V, VBAT = 8V, VMAX (maximum operating VCC) = 28V, RS2 = RS3 = 200Ω (see Block Diagram), VCLN = VCC. No load on any outputs unless otherwise no.


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