Description:The VRE3025 series of low cost, zener-based precision Integrated Circuits provides ultra-stable +2.5V output with ±0.25mV (.01%) initial accuracy. This improvement in accuracy is made possible by a unique, proprietary multipoint laser compensation technique. The device also features a buried zener for low noise and excellent long-term stability. Temperature coefficients are as low as 0.6 ppm/°C over the full industrial (0°C to +70°C) or hi-reliability industrial (-40°C to +85°C) temperature range depending
Apex Microtechnology recommends a 4-layer PCB with a solid ground plane, and thermal vias under the device to dissipate heat. A minimum of 2 oz copper thickness is recommended for the top and bottom layers. Additionally, a heat sink or thermal interface material can be used to further improve thermal management.
To ensure reliable operation over the full temperature range, it's essential to follow proper PCB design and layout guidelines, use a suitable thermal management strategy, and ensure that the device is operated within its specified voltage and current ratings. Additionally, consider using a thermistor or temperature sensor to monitor the device temperature and implement thermal shutdown or derating if necessary.
Apex Microtechnology recommends using low-ESR capacitors with a minimum capacitance of 10uF for the input and output. X5R or X7R ceramic capacitors or equivalent are suitable for this application. The capacitor selection should be based on the specific requirements of the system, including voltage rating, ripple current, and temperature range.
To protect the device from overvoltage and overcurrent conditions, consider using a voltage supervisor or overvoltage protection (OVP) circuit, and a current sense resistor or current limiter. Additionally, ensure that the device is operated within its specified voltage and current ratings, and implement thermal shutdown or derating if necessary.
Apex Microtechnology recommends a slow startup sequence, with a ramp-up time of at least 10ms, to prevent inrush currents and ensure reliable operation. During shutdown, the input voltage should be reduced slowly to prevent voltage spikes and ensure that the device is fully discharged before power-off.
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VRE3025LS Overview
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