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) | 4V | Digi-Key | |
| Package Case | TO-243AA | Digi-Key | |
| Protection Features | Over Current, Over Temperature, Short Circuit | Digi-Key | |
| Psrr | 44dB (100Hz) | Digi-Key | |
| Supplier Device Package | SOT-89-3 | Digi-Key | |
| Voltage Dropout (Max) | 0.35V @ 250mA | Digi-Key |
When To Use
Use the MCP1700T-4002E/MB in low-power, battery-operated devices requiring a stable 4V fixed output voltage and low quiescent current (4 µA). It is ideal for applications such as portable medical devices, handheld instruments, and sensor modules where a maximum output current of 250mA and low dropout voltage (0.35V at 250mA) help extend battery life while maintaining voltage regulation. The device’s wide operating temperature range (-40°C to 125°C) and protection features make it suitable for rugged environments.
When Not To Use
Do not use the MCP1700T-4002E/MB in applications requiring output voltages below 4V, output currents exceeding 250mA, or input voltages above 6V. For high-current loads or adjustable output voltages, consider using a regulator with higher current capability or adjustable output options, such as a switching regulator or a low dropout regulator designed for higher current and wider voltage ranges.
Application Notes
The input pin is the switching node where input voltage fluctuations occur; minimize loop area here to reduce noise and improve stability. The output pin is noise-sensitive and should be routed carefully to sensitive loads. Although the MCP1700T-4002E/MB has built-in protection features, a heatsink is generally not required at the maximum output current of 250mA due to its low dropout voltage and efficient thermal characteristics in the TO-243AA package. Proper PCB layout with adequate copper area for heat dissipation is recommended to maintain device temperature within the -40°C to 125°C operating range.
Gotchas
-
Mistake: Connecting the input voltage above 6V.
Failure mode: Device may experience permanent damage or degraded performance due to exceeding maximum input voltage rating.
Fix: Ensure the input voltage never exceeds 6V; use voltage limiting or a different regulator with a higher input voltage rating. -
Mistake: Drawing output current beyond 250mA.
Failure mode: Output voltage will drop below the specified 4V minimum, potentially causing system malfunction or regulator thermal shutdown.
Fix: Design the load to stay within the 250mA maximum output current; if higher current is needed, select a regulator with appropriate current capacity. -
Mistake: Using the device in applications requiring output voltage below 4V.
Failure mode: The fixed 4V output voltage will not meet the system’s voltage requirements, causing improper operation.
Fix: Use a regulator with adjustable output voltage or a fixed voltage regulator matching the required lower voltage.