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uP8208

Secondary Over-Voltage Protection for Battery with Voltage Regulator

General Description

The uP8208 series is used for secondary protection of lithium-ion rechargeable batteries, and incorporates a highaccuracy voltage detection circuit and a delay circuit. Short circuits between cells accommodate series connection of two to four cells. In order to drive an external RTC, a voltage regulator provides typical 3.3V included in uP8208.

Pin Configuration & Typical Application Circuit


WDFN2x2-8L

Feature

  • High Accuracy Voltage Detection Circuit for Each Cell
    • Overcharge Detection Voltage n (n = 1 to 4)
      4.3V to 4.6V (in 50mV steps)
      Accuracy: 20mV (+25°C)
      Accuracy: 30mV (0°C to +60°C) 
    • Overcharge Hysteresis Voltage n (n = 1 to 4)-0.38V±150mV
  • Delay Time for Overcharge Detection Can Be Set by An Internal Circuit (No External Capacitor Required)
  • Optional Overcharge Detection Delay Time:2s, 4s, 6s, and 8s
  • Optional Output Delay of Shutdown: 2s, 4s,6s, and 8s
  • High Withstand Voltage Devices:
    • Absolute Maximum Rating: 32V
    • Wide Operating Voltage Range: 4V to 24V
  • Wide Operating Temperature Range: -40°C to +85°C
  • Low Current Consumption
    • At 3.1V for Each Cell: 5.75uA max.(+25°C)
    • At 2V for Each Cell: 0.4uA max. (+25°C)
  • CO Pull Up Voltage: 4.7V
  • Support Test Mode to Shorten Mass Production Time
  • Voltage Regulator:
    • VOUT: 3.3V±2%
    • VOUT Off Voltage: 2.3V/2.5V/2.8V
    • Output Current: 2mA (max.)
    • VR Short Circuit Protection
  • RoHS Compliant and Halogen Free

Application

  • Lithium-Ion Rechargeable Battery Packs (for Secondary Protection)
  • Notebook Computers
  • Portable Instrumentation
  • Portable Equipment