Overview
The UC3906DW, produced by Texas Instruments, is a linear lead-acid battery charger controller designed to optimally control the charge and hold cycle for sealed lead-acid batteries. This integrated circuit includes all necessary circuitry to monitor and control both the output voltage and current of the charger, ensuring maximum battery capacity and life. The UC3906DW operates through three separate charge states: a high current bulk-charge state, a controlled over-charge state, and a precision float-charge or standby state. It maintains optimum charging conditions over an extended temperature range using an internal reference that tracks the nominal temperature characteristics of the lead-acid cell.
Key Specifications
| Parameter | Value | Units |
|---|---|---|
| Package Type | SOIC (DW) | |
| Pins | 16 | |
| Operating Temperature Range | -20 to 70 | °C |
| Supply Voltage (+VIN) | 40 | V |
| Open Collector Output Voltages | 40 | V |
| Amplifier and Comparator Input Voltages | -0.3 to +40 | V |
| Current Sense Amplifier Output Current | 80 | mA |
| Driver Current | 80 | mA |
| Typical Standby Supply Current | 1.6 | mA |
Key Features
- Optimum Control for Maximum Battery Capacity and Life
- Internal State Logic Provides Three Charge States: bulk-charge, over-charge, and float-charge
- Precision Reference Tracks Battery Requirements Over Temperature
- Controls Both Voltage and Current at Charger Output
- System Interface Functions
- Typical Standby Supply Current of only 1.6mA
- Separate Voltage Loop and Current Limit Amplifiers
- Supply Under-Voltage Sense Circuit with Logic Output
- Over-Charge State Monitoring and Termination
Applications
The UC3906DW is suitable for various applications involving sealed lead-acid batteries, including:
- Battery backup systems
- Uninterruptible Power Supplies (UPS)
- Automotive systems
- Telecommunications equipment
- Industrial power systems
Q & A
- What is the primary function of the UC3906DW?
The UC3906DW is a linear lead-acid battery charger controller designed to optimally control the charge and hold cycle for sealed lead-acid batteries.
- What are the three charge states provided by the UC3906DW?
The three charge states are: high current bulk-charge state, controlled over-charge state, and precision float-charge or standby state.
- How does the UC3906DW maintain optimum charging conditions over temperature?
The UC3906DW uses an internal reference that tracks the nominal temperature characteristics of the lead-acid cell.
- What is the typical standby supply current of the UC3906DW?
The typical standby supply current is 1.6mA.
- Can the UC3906DW be used in high-temperature environments?
- How does the UC3906DW control the output voltage and current?
The UC3906DW controls the output voltage and current using separate voltage loop and current limit amplifiers.
- What is the purpose of the supply under-voltage sense circuit?
The supply under-voltage sense circuit provides a logic output to indicate when input power is present.
- Can the over-charge state be externally monitored and terminated?
- What types of applications is the UC3906DW suitable for?
The UC3906DW is suitable for battery backup systems, UPS, automotive systems, telecommunications equipment, and industrial power systems.
- Is the UC3906DW RoHS compliant?
