Product Summary

The LTC1731EMS8-4.2#TR is a complete constant-current/constantvoltage linear charger controller for single cell lithium-ion batteries. Nickel-cadmium (NiCd) and nickel-metal-hydride (NiMH) batteries can also be charged with constant current using external termination. The external sense resistor sets the charge current with 5% accuracy. An internal resistor divider and precision reference set the final float potential with ±1% accuracy. The output float voltage is set internally to 4.1V (LTC1731-4.1) or 4.2V (LTC1731-4.2). When the input supply is removed, the LTC1731EMS8-4.2#TR automatically enters a low current sleep mode, dropping the battery drain current to typically 7mA. An internal comparator detects the end-of-charge (C/10) condition while a programmable timer, using an external capacitor, sets the total charge time. Fully discharged cells are automatically trickle charged at 10% of the programmed current until cell voltage exceeds 2.457V. The LTC1731EMS8-4.2#TR is available in the 8-pin MSOP and SO packages. Applications are cellular phones, handheld computers, charging docks and cradles, programmable current source.

Parametrics

LTC1731EMS8-4.2#TR absolute maximum ratings: (1)Input Supply Voltage (VCC): 13.2V; (2)Input Voltage (SENSE, DRV, BAT, TIMER, PROG): – 0.3V to 13.2V; (3)Output Voltage (CHRG): – 0.3V to 13.2V; (4)Operating Temperature Range: –40° to 85℃; (5)Storage Temperature Range : –65℃ to 150℃; (6)Lead Temperature (Soldering, 10 sec): 300℃.

Features

LTC1731EMS8-4.2#TR features: (1)Complete Linear Charger Controller for 1-Cell Lithium-IoBatteries; (2)1% Voltage Accuracy; (3)Programmable Charge Current; (4)C/10 Charge Current DetectioOutput; (5)Programmable Charge TerminatioTimer; (6)Space Saving 8-PiMSOP Package; (7)Automatic Sleep Mode WheInput Supply; (8)is Removed (7mA Battery Drain); (9)Automatic Trickle Charging of Low Voltage Cells; (10)Programmable for Constant-Current-Only Mode.

Diagrams

LTC1731EMS8-4.2#TR pin connection

Image Part No Mfg Description Data Sheet Download Pricing
(USD)
Quantity
LTC1731EMS8-4.2#TR
LTC1731EMS8-4.2#TR


IC CTRLR BATT CHRGR LI-ION 8MSOP

Data Sheet

0-5000: $1.17
LTC1731EMS8-4.2#TRPBF
LTC1731EMS8-4.2#TRPBF


IC CTRLR BATT CHRGR LI-ION 8MSOP

Data Sheet

0-2500: $1.17