The bq2002D/T is a low-cost CMOS battery charger controller that can provide reliable charge termination for both NiCd and NiMH battery applications.
This document describes the Texas Instruments bq2002D/T fast‑charge management IC for NiCd and NiMH batteries. It lists the device features, pin connections, functional description, and provides state diagrams and a block diagram of the internal control logic.
The datasheet also specifies the absolute maximum ratings, recommended DC operating conditions, low‑power mode behavior, and packaging options. Additional information includes termination criteria for fast charge, optional top‑off and pulse‑trickle modes, and how to inhibit charging via the INH pin.
| Supply voltage (Vcc) range | 4.0 V – 6.0 V |
|---|---|
| Operating ambient temperature | 0 °C – +70 °C |
| Storage temperature range | -40 °C – +85 °C |
| Standby current | 1 µA |
Fast charge and top‑off can be inhibited by setting the INH pin high, which suspends all charging activity while the pin remains high.
The TM pin is a three‑level input that selects the charge timer, top‑off mode, voltage termination mode, trickle rate, and voltage hold‑off period.