1-Cell Protection IC with Reset and Forced Standby Function for Li-Ion and Li-Polymer Batteries

Ricoh Electronic Devices has introduced a primary battery protection IC R5613 Series for rechargeable 1-cell Lithium-Ion and Lithium Polymer batteries. This Series is designed to enforce strict usage limits keeping the battery cell in optimal condition and preventing critical overload conditions. The new R5613 series features standard functions like over-charge and over-discharge voltage, discharge overcurrent, and charge overcurrent, and short circuit protection. The Target applications of this series include Li-Ion batteries or battery packs for portable devices such as smartphones, smartwatches, fitness trackers, or other electronic gadgets. Additionally, this IC features the RST pin function which can switch from an external MOSFET to either a RESET or a forced standby state.

The R5613 Series features a reset pin that enables controlling the IC externally and has two optional functions. This IC automatically enters the standby mode once the cell voltage drops below a certain threshold, some internal circuits will shut down, reducing current consumption and minimizing further discharge. It has a much lower current consumption (Typ. 2.0 – 2.5 µA) compared to predecessor products which are especially important for those applications with a small battery capacity. Moreover, the external current sense resistor value can be in the range of 1.5 mΩ which results in a lower heat dissipation at high currents.

Optional functions are available per product version, such as the 0 V battery charging, which offers the option to allow/disallow the battery to recharge from a deeply discharged state. Another option is to select between auto-release and latched release from overvoltage, Undervoltage, and discharge overcurrent status.

Application Circuit

Key Benefits of the R5613 Series:

• Lower-resistance of Sense Resistor by Overcurrent Detector with Lower-voltage and High-accuracy: Achieving Heat Reduction on Board
• Low Consumption Current and Low Standby Current: Achieving Longer Driving Time with A Battery of Small Capacity
• Switching to RESET or Forced-standby State by RST Pin: Allowed External Control of Load

The R5613 Series IC is now available in an 8 pins DFN1616-8B package, measuring L1.6 x W1.6 x H0.4 mm. Samples and evaluation boards are also available from authorized local distribution channels and online partners.

more information: https://www.n-redc.co.jp/en/products/lithium-ion-battery-protection/spec/?product=r5613