Overview
The UC2903DWTR is a quad supply and line monitor integrated circuit produced by Texas Instruments. This component is designed to monitor up to four separate supply voltage levels and respond to under- and over-voltage conditions. It features an internal op-amp inverter that allows monitoring of negative supply voltages and a separate line/switcher sense input for early detection of power source failures. The UC2903DWTR operates over a wide input supply range of 8 to 40 volts and includes a precision 2.5-V reference output, making it versatile for various power monitoring applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (+VIN) | 8 | - | 40 | V |
| Input Supply Current (No Faults) | 7 | 9 | 11 | mA |
| Input Supply Current (UV, OV and Line Fault) | 10 | 15 | 18 | mA |
| Supply Under Voltage Threshold Fault | 6.0 | 7.0 | 7.5 | V |
| Reference Output Voltage (VREF) at TJ = 25°C | 2.485 | 2.5 | 2.515 | V |
| Operating Junction Temperature | -55 | - | 125 | °C |
| Storage Temperature | -65 | - | 150 | °C |
| Lead Temperature (Soldering, 10 Seconds) | - | - | 300 | °C |
Key Features
- Inputs for monitoring up to four separate supply voltage levels.
- Internal op-amp inverter for sensing negative supply voltages.
- Line/switcher sense input for early warning of power source failures.
- Programmable under- and over-voltage fault thresholds with proportional hysteresis.
- Precision 2.5-V reference output.
- Uncommitted general-purpose op-amp capable of sourcing 20 mA of output current.
- Fault delay circuitry with adjustable delay times.
- Low standby current of 7 mA.
Applications
The UC2903DWTR is suitable for a variety of power monitoring and management applications, including:
- Power supply monitoring in industrial and commercial systems.
- Line and switcher power source failure detection.
- Voltage monitoring in automotive and aerospace systems.
- System power-up sequencing and fault detection.
- General-purpose op-amp applications such as feedback error signal sensing and amplification.
Q & A
- What is the primary function of the UC2903DWTR?
The UC2903DWTR is a quad supply and line monitor integrated circuit designed to monitor up to four separate supply voltage levels and respond to under- and over-voltage conditions.
- What is the input supply voltage range for the UC2903DWTR?
The input supply voltage range is from 8 to 40 volts.
- How many sense inputs does the UC2903DWTR have?
The UC2903DWTR has four sense inputs for monitoring separate supply voltage levels.
- What is the purpose of the internal op-amp inverter?
The internal op-amp inverter allows the monitoring of negative supply voltages.
- Can the fault thresholds be programmed?
- What is the precision of the reference output voltage?
The reference output voltage is 2.5 V with a precision of ±0.015 V at TJ = 25°C.
- What is the typical standby current of the UC2903DWTR?
The typical standby current is 7 mA.
- How does the line/switcher sense input work?
The line/switcher sense input provides early warning of line or other power source failures by comparing the input voltage to a 2.0 V internal reference.
- Can the general-purpose op-amp be used for other functions?
- What is the operating junction temperature range for the UC2903DWTR?
The operating junction temperature range is from -40°C to +85°C.
