Overview
The MC33340DR2, produced by ON Semiconductor, is a monolithic control IC specifically designed as a fast charge controller for Nickel Cadmium (NiCd) and Nickel Metal Hydride (NiMH) batteries. These devices feature negative slope voltage detection as the primary means for fast charge termination, ensuring accurate detection by momentarily interrupting the charge current for precise voltage sampling. An additional secondary backup termination method can be selected, consisting of either a programmable time or temperature limit. The MC33340DR2 includes protective features such as battery over and undervoltage detection, latched over temperature detection, and power supply input undervoltage lockout with hysteresis.
Key Specifications
| Characteristic | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Input Sensitivity for −ΔV Detection | −ΔVth | - | -4.0 | - | mV |
| Overvoltage Threshold | Vth(OV) | 1.9 | 2.0 | 2.1 | V |
| Undervoltage Threshold | Vth(UV) | 0.95 | 1.0 | 1.05 | mV |
| Input Bias Current | IIB | - | 10 | - | nA |
| Internal Clock Oscillator Frequency | fOSC | - | 760 | - | kHz |
| Fast Charge Holdoff Time (MC33340) | thold | - | 177 | - | s |
| Power Supply Voltage (Pin 8) | VCC | - | - | 18 | V |
| Operating Ambient Temperature | TA | -25 | - | 85 | °C |
Key Features
- Negative Slope Voltage Detection with 4.0 mV Sensitivity
- Accurate Zero Current Battery Voltage Sensing
- High Noise Immunity with Synchronous VFC/Logic
- Programmable 1 to 4 Hour Fast Charge Time Limit
- Programmable Over/Under Temperature Detection
- Battery Over and Undervoltage Fast Charge Protection
- Power Supply Input Undervoltage Lockout with Hysteresis
- Operating Voltage Range of 3.25 V to 18 V
- 177 seconds Fast Change Holdoff Time (MC33340) and 708 seconds for MC33342
- Pb−Free Packages are Available
Applications
The MC33340DR2 is primarily used in applications requiring fast and precise charging of Nickel Cadmium (NiCd) and Nickel Metal Hydride (NiMH) batteries. These include:
- Portable electronic devices such as cordless phones, power tools, and other battery-powered equipment.
- Battery management systems in automotive and industrial applications.
- Any system where reliable and efficient battery charging is critical.
Q & A
- What types of batteries does the MC33340DR2 support?
The MC33340DR2 supports Nickel Cadmium (NiCd) and Nickel Metal Hydride (NiMH) batteries.
- What is the primary method of fast charge termination used by the MC33340DR2?
The primary method is negative slope voltage detection.
- What are the typical fast charge holdoff times for the MC33340 and MC33342?
The MC33340 has a typical holdoff time of 177 seconds, and the MC33342 has a typical holdoff time of 708 seconds.
- What protective features are included in the MC33340DR2?
Protective features include battery over and undervoltage detection, latched over temperature detection, and power supply input undervoltage lockout with hysteresis.
- What is the operating voltage range of the MC33340DR2?
The operating voltage range is from 3.25 V to 18 V.
- Is the MC33340DR2 available in Pb−Free packages?
- What is the maximum power supply voltage for the MC33340DR2?
The maximum power supply voltage is 18 V.
- What is the operating ambient temperature range for the MC33340DR2?
The operating ambient temperature range is from −25°C to +85°C.
- Does the MC33340DR2 have ESD protection?
- How many active transistors are in the MC33340DR2?
The device contains 2,512 active transistors.
