MC33340/D MC33340, MC33342 Battery Fast Charge Controllers are monolithic control IC's that are specifically designed as fast charge controllers for Nickel Cadmium (NiCd) and Nickel Metal Hydride (NiMH) batteries.
The MC33340 and MC33342 are monolithic fast‑charge controller ICs designed for Nickel‑Cadmium and Nickel‑Metal‑Hydride batteries. They use negative‑slope voltage detection to terminate charging and provide programmable time or temperature limits as backup termination methods. The MC33340 differs from the MC33342 only in its fast‑charge holdoff time (177 s vs 708 s).
The document includes maximum ratings, electrical characteristics, pin descriptions, package dimensions for PDIP‑8 and SO‑8 versions, and detailed operating descriptions such as the negative‑slope voltage detector, backup timer, and over/under‑temperature protection.
| Operating Voltage Range | 3.25 V to 18 V |
|---|---|
| Fast Charge Holdoff Time (MC33340) | 177 seconds |
| Fast Charge Holdoff Time (MC33342) | 708 seconds |
| Power Supply Voltage (Pin 8) Voc | 18 V |
| Maximum Operating Junction Temperature | +150 °C |
| Operating Ambient Temperature Range | -25 °C to +85 °C |
| Storage Temperature Range | -55 °C to +150 °C |
| Input Bias Current | -10 nA |
| Input Resistance | 6.0 MΩ |
| Internal Clock Oscillator Frequency | 760 kHz |
| Gate Time | 33 ms |
| Gate Repetition Rate | 1.38 s |
The only difference is the fast‑charge holdoff time: the MC33340 holds off for 177 seconds, while the MC33342 holds off for 708 seconds.