High Reliability Secondary Protection Solution of Lithium Ion Battery for Multi-Cells Application

According to popularization of mobile technology and Smartphone, high capacity low weight of lithium ion battery (LiB) is quite normally used in our daily life. However safety issue of lithium ion battery is concerned as potential damage to people’s properties even human life. How to safely use LiB is the major issue when battery manufactures are developing their products.

Among each safety solution of LiB, high reliable protection ICs are strongly required for safely using in every specified condition. Especially for as the last means of Secondary Protection IC (Secondary Over Voltage Protection) in LiB protection mechanism, its high reliability and extra long MTBF (Mean Time Between Failure) is indispensable. uPI group (uPI & uBIQ) have developed high reliable Secondary Protection IC and also well-developed compatible switch N-ch MOSFET for providing package solution to customers. All of uPI group including LiB protection ICs and battery level MOSFET had acquired high reliability certification including HTOL, ESD, Latch-up and MSL-1 test.

uPI Secondary Lithium Ion Battery Protection ICs uP8206 / uP8207 / uP8208 main characteristics table

Products Cell Series Application Over Voltage Detection Delay Time Setting Package Type

uP8206

has Output Control Function via CTL Pin which could implement over-temperature protection through suitable PTC resistor connecting to CTL Pin.

 2S to 4S 4.3V to 4.6V by internal circuit UUTDFN
1.97×2.46-8L

uP8207

is most cost effective product for 2S-cells & 3S-cells application only.

 2S to 3S 4.3V to 4.6V WDFN2x2-8L

uP8208

has Voltage Regulator Function via Vout Pin which could drive external RTC device up to MAX 2mA current output.

 2S to 4S 4.2V to 4.7V MB/VGA

Features:

  • High-Accuracy Voltage Detection Circuit for Each Cell
  • Delay Time for Overcharge Detection Can Be Set by An Internal Circuit (No External Capacitor Required)
  • High Withstand Voltage Devices
  • Wide Operating Temperature Range
  • Low Current Consumption
  • Support Test Mode to Shorten Mass Production Time
  • Compatible with the current IPC/JEDEC J-STD-020 requirement, halogen-free, RoHS compliant and 100% matte tin (Sn) plating that are suitable for use in SnPb or Pb-free soldering processes 

uBIQ Switch N-ch MOSFET QM3002K / QM3008K main characteristics table

Products MOSFET Type Rds_on MAX VGS = 10V VDS VGS Vth MAX Package Type
QM3002K N 28mΩ 30V ±20V 2.5V SOT23
QM3008K N 33mΩ

Features:

  • Advanced high cell density trench technology
  • Super low gate charge
  • Excellent CdV/dt effect decline
  • Green device available

[ex. Application Circuit of uP8208]

Furthermore, high reliable LiB protection products with ultra-high voltage detection accuracy and extra-low power consumption will be the main features of next uPI protection ICs.