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Description
Quad Supply and Line Monitor
All product names, trademarks, brands and logos used on this site are the property of their respective owners. The depiction, description or sale of products featuring these names, trademarks, brands and logos is for identification purposes only and is not intended to indicate any affiliation with or authorization by any rights holder.
The parameters and performance indicators of this product are sourced from the internet. In case of discrepancies, please refer to the manufacturer's technical specifications!！
| Parameter | Symbol | Conditions | Min | Typical | Max | Unit |
|---|---|---|---|---|---|---|
| Supply Voltage | Vcc | Operating | 4.5 | - | 28 | V |
| Output Current | Iout | Continuous | - | 1.5 | 2.0 | A |
| Shutdown Current | Ishutdown | Vcc = 5V, Shutdown mode | 0.1 | - | 1.0 | μA |
| Thermal Shutdown Temperature | Tshut | - | 160 | - | - | °C |
| Overcurrent Protection | Iocp | - | 2.2 | - | 2.8 | A |
| Quiescent Current | Iq | Vcc = 5V, No load | 2.0 | - | 4.0 | mA |
| Dropout Voltage | Vdo | Iout = 1.0A, Vcc = 5V | 0.4 | - | 1.0 | V |
| Line Regulation | ΔVout/ΔVin | Iout = 1.0A, Vcc = 5V to 28V | - | 0.01 | - | % |
| Load Regulation | ΔVout/ΔIout | Vin = 5V, Iout = 0 to 1.5A | - | 0.1 | - | % |
| Ripple Rejection | AVRR | 10Hz to 100kHz, Vcc = 5V | - | 70 | - | dB |
Power Supply Connection:
Output Configuration:
Thermal Management:
Shutdown Mode:
Overcurrent Protection:
Line and Load Regulation:
Ripple Rejection:
Capacitor Selection:
PCB Layout:
Storage and Handling:
By following these instructions, you can ensure reliable operation and optimal performance of the UC3903N.
(For reference only)FEATURES
● Inputs for Monitoring up to Four Separate Supply Voltage Levels
● Internal Inverter for Sensing a Negative Supply Voltage
● Line/Switch Sense Input for Early Power Source Failure Warning
● Programmable Under- and Over-Voltage Fault Thresholds with Proportional Hysteresis
● A Precision 2.5V Reference
● General Purpose Op-Amp for Auxiliary Use
● Three High Current, >30mA, Open-Collector Outputs Indicate Over-Voltage, Under-Voltage and Power OK Conditions
● Input Supply Under-Voltage Sensing 'and Start-Latch Eliminate Erroneous Fault Alerts During Start-Up
● 8-40V Supply Operation with 7mA Stand-By Current
DESCRIPTION
The UC1903 family of quad supply and line monitor integrated circuits will respond to under- and over-voltage conditions on up to four continuously monitored voltage levels.An internal op-amp inverter allows at least one of these levels to be negative. A separate line/switcher sense input is available to provide early warning of line or other power source failures.
The fault window adjustment circuit on these devices provides easy programming of under- and over-voltage thresholds.The thresholds, centered around a precision 2.5V reference, have an input hysteresis that scales with the window width for precise, glitch-free operation. A reference output pin allows the sense input fault windows to be scaled independently using simple resistive dividers.
The three open collector outputs on these devices will sink in excess of 30mA of load current when active.The under- and over-voltage outputs respond after separate, user defined, delays to respective fault conditions. The third output is active during any fault condition including under- and over-voltage, line/switcher faults,and input supply under-voltage. The off state of this out-put indicates a "power OK" situation.
An additional,uncommitted,general purpose op-amp is also included.This op-amp, capable of sourcing 20mA of output current, can be used for a number of auxiliary functions including the sensing and amplification of a feed-back error signal when the 2.5V output is used as a system reference.
In addition, these ICs are equipped with a start-latch to prevent erroneous under-voltage indications during start-up.These parts operate over an 8V to 40V input supply range and require a typical stand-by current of only 7mA.
| QUANTITY | UNIT PRICE | PLUS UNIT PRICE | TOTAL PRICE |
|---|---|---|---|
| ≥1: | US $2.93370 | US $2.64033 | US $2.64033 |
| ≥5: | US $1.95580 | US $1.76022 | US $8.80110 |
| ≥10: | US $1.76022 | US $1.58420 | US $15.84200 |
| ≥20: | US $1.71132 | US $1.54019 | US $30.80380 |
| ≥50: | US $1.66243 | US $1.49619 | US $74.80950 |
| ≥100: | US $1.61354 | US $1.45219 | US $145.21900 |
| ≥200: | US $1.56464 | US $1.40818 | US $281.63600 |
| ≥500: | US $1.54508 | US $1.39057 | US $695.28500 |
| ≥1000: | US $1.51574 | US $1.36416 | US $1364.16000 |
Substitute (equivalent) Product
| Substitute Product Name | Description |
|---|---|
| UC3906N | A linear charge management controller optimized for sealed lead-acid batteries, providing high accuracy and stability in charging profiles. |
| LTC4006 | A complete high-efficiency, switch-mode battery charger controller for notebook computers, providing a simple solution for charging applications. |
| LM3420MF-8.2 | A voltage detector that provides a simple charging control for 1 to 10 cell lithium-ion batteries, ensuring safe and efficient charging. |
| MAX712CPE | A fast charge solution for NiCd/NiMH batteries, ensuring fast charge cycles without degrading the battery life. |
| UCC39002PW | An advanced battery charge and discharge controller that can be used for a wide variety of battery chemistries, including Li-Ion and lead-acid. |
| ISL88731HRTZ | A highly integrated battery charger, designed for Li-ion batteries with SMBus/I2C interface and voltage/current regulation. |
| TPS54620RHLT | A high-efficiency synchronous buck converter that can be used in battery charging applications, providing robust power management. |
| BQ24074RGTR | A single-cell Li-ion battery charger with a dual-input option, supporting both USB and AC adapter inputs for convenient charging. |
| MCP73831T-2ACI/OT | A miniature single cell Li-Ion charge management controller with programmable charge currents, suitable for space-constrained applications. |
| LT1510 | A fast and versatile battery charger with input voltage and current loop regulation, ideal for both NiCd/NiMH and Li-Ion batteries. |
Product Usage
The UC3903N is a Quad Supply and Line Monitor IC, often used in circuits for monitoring multiple power supply voltages within an electronic system. Here are some common applications and types of circuits where the UC3903N might be used:
Power Supply Supervisors: The UC3903N ensures that the power supplies are within specified voltage ranges. It can monitor four different supply voltages and provides indication and control to maintain those voltages within set thresholds.
Microcontroller Supervisory Circuits: In systems where microcontrollers (MCUs) are employed, the UC3903N can be used to monitor the supply voltages to the MCU to ensure they are within safe operational limits. It can help in providing a reset signal if any of the monitored supplies fall outside their specified range.
Fault Detection Circuits: The UC3903N can be a part of fault detection mechanisms in critical systems where maintaining the correct power supply voltage is crucial. If a fault is detected, the system can take corrective actions such as shutting down or switching to backup supplies.
Embedded Systems Monitoring: It is used in embedded systems to ensure that various components are receiving proper supply voltages. This is particularly important in systems that might have multiple voltage rails supplying different chips or modules.
Telecommunication Systems: In telecommunication systems where multiple voltage levels need to be monitored, the UC3903N can be used to supervise these voltages, ensuring reliable operation and preventing damage to sensitive components.
Industrial Control Systems: Industrial control systems often require reliable power supply monitoring due to their critical nature. The UC3903N helps to monitor and maintain proper voltages in these environments.
Here’s a simplified example of how it might be used in a power supply monitoring setup:
Required+V1 ------- UC3903N Pin X1
|
+V2 ------- UC3903N Pin X2
|
+V3 ------- UC3903N Pin X3
|
+V4 ------- UC3903N Pin X4
|
UC3903N
|
--- Output: Indicates if any supply is out of the defined range.
In this example, +V1, +V2, +V3, and +V4 are the different supply voltages being monitored. The UC3903N outputs a signal if any of these voltages go out of the predefined range. This output can then be used to trigger alarms, resets, or other corrective measures.
By utilizing the UC3903N, designers can ensure the reliability and safety of systems that depend heavily on stable and well-regulated power supplies.
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Warranty
All UTSOURCE purchases have a 90 days money back return policy, plus a 100 days UTSOURCE warranty against any manufacturing defects.This warranty shall not apply to any item where defects have been caused by improper customer assembly, failure by customer to follow instructions, product modification, negligent or improper operation.
UC3903N
UC3903N has several brands around the world that may have alternate names for UC3903N due to regional differences or acquisition. UC3903N may also be known as the following names:
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