Overview
The UC2909MDWREP from Texas Instruments is a switchmode lead-acid battery charger integrated circuit designed for high-efficiency and accurate battery charging. This device is particularly suited for applications in defense, aerospace, and medical fields due to its robust and reliable performance. The UC2909MDWREP features a controlled baseline charging mechanism and supports a wide temperature range of -55°C to 125°C, making it versatile for various environments.
Key Specifications
| Parameter | Test Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply Voltage (VCC) | 8.8 | 35 | V | ||
| Output Current Sink | 50 | mA | |||
| Storage Temperature (Tstg) | -55 | 150 | °C | ||
| Junction Temperature Range (TJ) | -55 | 150 | °C | ||
| Oscillator Frequency | 8.8 V < VCC < 35 V | 151.65 | 168.50 | 185.35 | KHz |
| Undervoltage Lockout (UVLO) Turn-on Threshold | 6.8 | 7.8 | 8.8 | V | |
| ICC (run) | See Figure 1 | 13 | 19 | mA |
Key Features
- Accurate and efficient control of battery charging using average current mode control from trickle to overcharge states.
- Controlled baseline charging and extended product life cycle.
- Resistor programmable charge currents and thermistor interface to track battery temperature.
- Output status bits report on four internal charge states.
- Undervoltage lockout monitors VCC and VREF.
- Differential current sense amplifier, 1.5% voltage reference, and PWM oscillator.
- 100-mA open collector output driver.
- Available in military temperature range (-55°C to 125°C).
- Extended product-change notification and product traceability.
Applications
The UC2909MDWREP is designed for various critical applications, including:
- Defense and aerospace systems where reliability and precision are paramount.
- Medical devices that require stable and efficient battery charging.
- Off-line battery charging applications, including designs with high-frequency operation and isolated configurations.
- Any system requiring accurate and efficient lead-acid battery charging across a wide temperature range.
Q & A
- What is the primary function of the UC2909MDWREP?
The UC2909MDWREP is a switchmode lead-acid battery charger integrated circuit designed for accurate and efficient battery charging.
- What temperature range does the UC2909MDWREP support?
The device supports a temperature range of -55°C to 125°C.
- What are the key charge states monitored by the UC2909MDWREP?
The device monitors trickle, bulk, overcharge, and float charge states.
- How does the UC2909MDWREP handle undervoltage conditions?
The device includes undervoltage lockout circuitry to ensure sufficient supply voltage is present before output switching starts.
- What is the role of the thermistor interface in the UC2909MDWREP?
The thermistor interface tracks battery temperature to ensure accurate charging across different temperatures.
- What is the maximum output current sink of the UC2909MDWREP?
The maximum output current sink is 50 mA.
- How does the UC2909MDWREP report on charge states?
The device reports on four internal charge states using output status bits.
- What are the typical applications of the UC2909MDWREP?
The device is used in defense, aerospace, medical devices, and off-line battery charging applications.
- What is the oscillator frequency range of the UC2909MDWREP?
The oscillator frequency ranges from 151.65 KHz to 185.35 KHz.
- How does the UC2909MDWREP handle overcharge conditions?
The device transitions to an overcharge state when the battery voltage surpasses 95% of the target voltage, and the charge current begins to taper off.
