SC1766 Datasheet | SEMTECH

DESCRIPTION The SC1766 fast charge controller IC is designed for intelligent charging of Ni MH or Ni Cd batteries without overcharging. It detects a voltage drop (-∆V) occurring in the final stage of a fast charging cycle and correspondingly controls the charging current. Fast charge can also be cut off by a peak voltage timer (0∆V). The detection of -∆V is a very reliable method to terminate fast charging for Ni MH and Ni Cd batteries. The SC1766 uses -∆V detection as one of the primary decisions for fast charge cut-off. The -∆V value of the SC1766 is as small as 4m V per cell, particularly suitable for Ni MH as well as Ni Cd batteries. The peak voltage timer is particularly useful when the voltage drop at the end of charge for some batteries, e.g. Ni MH cells, is not pronounced enough for reliable detection. An adjustable safety timer (3 settings) is used as a backup termination method. Provisions are made with the SC1766 to prevent fast charge under temperature fault conditions. Two LED outputs are used to indicate the charging status. Another flash LED output can be used alone to indicate charge status. AC mode allows the battery to drive its loads while being charged. Test mode is provided to dramatically reduce production test time. Features - Reliable fast charge control of Ni MH/Ni Cd - batteries Fast charge termination by: 1 Accurate -∆V detection level -0.25% with respect to peak value 2 Peak voltage timer (0∆V) Adjustable fast charge safety timer Protection against temperature fault Protection against short-circuited and open batteries Wide operation voltage range of 9V to 18V, no extra regulator needed Large battery voltage detection range of 0.65V to 3.7V LED drivers to indicate charge status or fault conditions Voltage reference output Quick and easy testing for production Space saving 8-pin and 14-pin SO packages - - - - - - - - - ORDERING INFORMATION DEVICE (1) PACKAGE SO-8 SO-14 SC1766CS08 SC1766CS14 Note: (1) Add suffix ‘TR’ for tape and...