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LTC4081

Features: ` Constant-Current/Constant-Voltage Operation with Thermal Feedback to Maximize Charge Rate Without Risk of Overheating` Internal 4.5 Hour Safety Timer for Termination` Charge Current Programmable Up to 500mA with 5% Accuracy` NTC Thermistor Input for Temperature Qualifi ed Charging` C/1...

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SeekIC No. : 004402447 Detail

LTC4081: Features: ` Constant-Current/Constant-Voltage Operation with Thermal Feedback to Maximize Charge Rate Without Risk of Overheating` Internal 4.5 Hour Safety Timer for Termination` Charge Current Prog...

LTC4081 Data Sheet

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Part Number:
LTC4081
Supply Ability:
5000

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  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Upload time: 2024/11/23

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Product Details

Description



Features:

` Constant-Current/Constant-Voltage Operation
    with Thermal Feedback to Maximize Charge Rate
    Without Risk of Overheating
` Internal 4.5 Hour Safety Timer for Termination
` Charge Current Programmable Up to 500mA with 5% Accuracy
` NTC Thermistor Input for Temperature Qualifi ed Charging
` C/10 Charge Current Detection Output
` 5A Supply Current in Shutdown Mode Switching Regulator:
` High Effi ciency Synchronous Buck Converter
` 300mA Output Current (Constant-Frequency Mode)
` 2.7V to 4.5V Input Range (Powered from BAT Pin)
` 0.8V to VBAT Output Range
` MODE Pin Selects Fixed (2.25MHz) Constant-FrequencynPWM Mode
    or Low ICC (23A) Burst Mode® Operation
` 2A BAT Current in Shutdown Mode
` 10-lead, low profi le (0.75 mm) 3mm * 3mm DFN package


Application

· Wireless Headsets
· Bluetooth Applications
· Portable MP3 Players
· Multifunction Wristwatches


Pinout

Connection Diagram


Specifications

VCC, t < 1ms and Duty Cycle < 1% ........... 0.3V to 7V
VCC Steady State ..................................... 0.3V to 6V
BAT,CHRG ................................................. 0.3V to 6V
EN CHRG, PROG, NTC ................... 0.3V to VCC + 0.3V
MODE, EN_BUCK ........................ 0.3V to VBAT + 0.3V
FB ............................................................. 0.3V to 2V
BAT Short-Circuit Duration ............................Continuous
BAT Pin Current ...................................................800mA
PROG Pin Current ....................................................2mA
Junction Temperature .......................................... .125
Operating Temperature Range (Note 2) .. 40 to 85
Storage Temperature Range ................. 65 to 125


Description

The LTC4081 is a complete constant-current/constantvoltage linear battery charger for a single-cell 4.2V lithium-ion/polymer battery with an integrated 300mA synchronous buck converter. A 3mm × 3mm DFN package and low external component count make the LTC4081 especially suitable for portable applications. Furthermore, the device is specifi cally designed to work within USB power specifi cations.

The CHRG pin indicates when charge current has dropped to ten percent of its programmed value (C/10). An internal 4.5 hour timer terminates the charge cycle. The full-featured LTC4081 battery charger also includes trickle charge, automatic recharge, soft-start (to limit inrush current) and an NTC thermistor input used to monitor battery temperature.

The LTC4081 integrates a synchronous buck converter that is powered from the BAT pin. It has an adjustable output voltage and can deliver up to 300mA of load current. The buck converter also features low-current higheffi ciency Burst Mode operation that can be selected by the MODE pin.

The device is available in a 10-lead, low profi le (0.75 mm) 3mm × 3mm DFN package.




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