Overview
The MC33340DR2G, produced by onsemi, is a monolithic control IC specifically designed as a fast charge controller for Nickel Cadmium (NiCd) and Nickel Metal Hydride (NiMH) batteries. This device is part of the MC33340 and MC33342 series, which are engineered to provide precise charge termination control to maximize battery cell capacity and operating time while preventing overcharging.
The MC33340DR2G features advanced protective mechanisms and flexible programming options, making it suitable for a wide range of portable applications that require rapid and safe battery charging.
Key Specifications
| Characteristic | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Power Supply Voltage (Pin 8) | VCC | - | - | 18 | V |
| Input Voltage Range (Time/Temperature Select) | VIR(t/T) | -1.0 | - | VCC | V |
| Battery Sense Input Voltage | VIR(sen) | -1.0 | - | VCC + 0.6 or 10 | V |
| Vsen Gate Output Voltage | VO(gate) | - | - | 20 | V |
| Vsen Gate Output Current | IO(gate) | - | - | 50 | mA |
| Fast/Trickle Output Voltage | VO(F/T) | - | - | 20 | V |
| Fast/Trickle Output Current | IO(F/T) | - | - | 50 | mA |
| Thermal Resistance, Junction-to-Air | RθJA | - | - | 100 (P Suffix), 178 (D Suffix) | °C/W |
| Operating Junction Temperature | TJ | - | - | 150 | °C |
| Operating Ambient Temperature | TA | -25 | - | 85 | °C |
| Storage Temperature | Tstg | -55 | - | 150 | °C |
| Fast Charge Holdoff Time | thold | - | 177 | - | seconds |
Key Features
- Negative Slope Voltage Detection with 4.0 mV Sensitivity for precise fast charge termination.
- Accurate Zero Current Battery Voltage Sensing.
- High Noise Immunity with Synchronous VFC/Logic.
- Programmable 1 to 4 Hour Fast Charge Time Limit.
- Programmable Over/Undertemperature 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.
- Latched Over Temperature Detection to prevent continuous temperature cycling and overcharging.
- Pb−Free Packages are Available.
Applications
The MC33340DR2G is designed for use in various portable applications that require fast and reliable battery charging, such as:
- Portable power tools.
- Consumer electronics requiring NiCd or NiMH battery charging.
- Industrial battery chargers.
- Automotive battery management systems.
Q & A
- What types of batteries does the MC33340DR2G support?
The MC33340DR2G supports Nickel Cadmium (NiCd) and Nickel Metal Hydride (NiMH) batteries.
- What is the primary method for fast charge termination in the MC33340DR2G?
The primary method is Negative Slope Voltage Detection.
- What is the typical fast charge holdoff time for the MC33340DR2G?
The typical fast charge holdoff time is 177 seconds.
- How does the device protect against overtemperature conditions?
The device features latched overtemperature detection, which switches the charger to trickle mode and prevents it from returning to fast charge mode until the power supply is cycled or the battery pack is removed and reconnected.
- Can the time and temperature backup features be disabled?
- What is the operating voltage range of the MC33340DR2G?
The operating voltage range is from 3.25 V to 18 V.
- How does the device handle battery over and undervoltage conditions?
The device includes battery over and undervoltage protection, switching to trickle mode if the battery voltage is outside the fast charge range.
- Is the MC33340DR2G available in Pb−Free packages?
- What is the purpose of the Vsen input in the MC33340DR2G?
The Vsen input monitors the battery voltage and is connected to a voltage to frequency converter for precise voltage sensing.
- How does the device handle initial voltage drops during battery charging?
The device implements a trickle mode holdoff to ignore initial voltage drops that may occur when charging batteries that have been stored for an extended time period.
