Key Specs
| Spec | Value | Condition | Source |
|---|---|---|---|
| Control Features | - | Digi-Key | |
| Current Quiescent IQ | 4 µA | Digi-Key | |
| Input Voltage (Max) | 6V | Digi-Key | |
| Mounting Type | Surface Mount | Digi-Key | |
| Number Of Regulators | 1 | Digi-Key | |
| Operating Temperature Range | -40°C ~ 125°C | Digi-Key | |
| Output Configuration | Positive | Digi-Key | |
| Output Current (Max) | 250mA | Digi-Key | |
| Output Type | Fixed | Digi-Key | |
| Output Voltage (Max) | - | Digi-Key | |
| Output Voltage (Min) | 3.1V | Digi-Key | |
| Package Case | TO-236-3, SC-59, SOT-23-3 | Digi-Key | |
| Protection Features | Over Current, Over Temperature, Short Circuit | Digi-Key | |
| Psrr | 44dB (100Hz) | Digi-Key | |
| Supplier Device Package | SOT-23-3 | Digi-Key | |
| Voltage Dropout (Max) | 0.35V @ 250mA | Digi-Key |
When To Use
Use the MCP1700T-3102E/TT in low-power, battery-operated devices requiring a stable 3.1V fixed output with very low quiescent current (4 µA) to maximize battery life. It is ideal for portable medical devices, handheld instrumentation, and sensor nodes that operate within a 6V input range and demand up to 250mA output current. The device’s small SOT-23-3 package and low dropout voltage (0.35V @ 250mA) make it well suited for compact, space-constrained designs where thermal dissipation is manageable without a heatsink.
When Not To Use
Do not use the MCP1700T-3102E/TT in applications requiring output voltages other than 3.1V fixed, output currents exceeding 250mA, or input voltages above 6V. For example, high-current automotive systems needing more than 250mA or adjustable output voltages should use an LDO regulator with higher current capability and adjustable output options. Also avoid in environments exceeding the -40°C to 125°C operating temperature range or where enhanced protection features beyond overcurrent, overtemperature, and short circuit are required.
Application Notes
The input pin is the switching node and should have the smallest possible loop area with the ground return path to minimize noise and voltage spikes. The output pin is noise-sensitive and should be routed away from high-frequency switching signals to maintain output voltage stability. Due to the low dropout voltage and maximum output current of 250mA, the device typically does not require a heatsink under normal operating conditions within the specified temperature range. However, proper PCB thermal design is recommended to ensure junction temperatures remain within limits.
Gotchas
-
Engineer mistake: Operating the MCP1700T-3102E/TT with an input voltage exceeding 6V.
Failure mode: The regulator may be damaged or permanently fail due to exceeding maximum input voltage rating.
Fix/avoidance: Always verify the input supply voltage remains below 6V; use voltage clamps or input protection if necessary. -
Engineer mistake: Drawing output current above 250mA continuously.
Failure mode: The device may enter thermal shutdown or current limit, causing output voltage drop or instability.
Fix/avoidance: Design the load to not exceed 250mA maximum output current; consider a higher current regulator if needed. -
Engineer mistake: Ignoring thermal considerations on a poorly ventilated PCB with high ambient temperature.
Failure mode: Device temperature rises above 125°C, triggering thermal shutdown or damaging the regulator.
Fix/avoidance: Ensure adequate PCB copper area for heat dissipation and maintain ambient temperature within specified range.