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) | 2.8V | 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-2802E/TT in low-power, space-constrained applications requiring a very low quiescent current of 4 µA and a fixed 2.8 V output voltage. Typical applications include battery-powered devices and portable electronics where minimal power loss and compact surface mount packaging (SOT-23-3) are critical. Avoid using this regulator in designs requiring output voltages above 2.8 V or output currents exceeding 250 mA; in those cases, consider regulators with higher output voltage options or higher current ratings.
When Not To Use
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5V rail @ 1A load for motor control: Output current max of 250mA is insufficient for this load; use a multi-phase buck controller designed for higher current and better thermal management.
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Battery-powered sleep mode device with µA-level standby current: Although quiescent current is low, 4µA is still too high for deep sleep applications; use a low-IQ PFM buck to minimize battery drain during extended standby.
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Input/output voltage difference under 0.5V with strict noise requirements: The 0.35V dropout is too high to maintain regulation in this small headroom scenario; use a LDO regulator optimized for low dropout and low output noise.
Application Notes
The input pin is the switching node and must have the smallest possible loop area to minimize noise and ensure stable operation. The output pin is noise-sensitive and should be connected to a stable load and proper PCB layout to reduce ripple. Due to the low quiescent current and power dissipation at 250 mA output current, a heatsink is generally not required within the operating temperature range of -40°C to 125°C. However, thermal considerations should be made for high ambient temperatures or extended high-current operation.
Gotchas
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Engineer omits verifying the maximum input voltage rating and applies more than 6 V to the input. The regulator can be permanently damaged due to overvoltage stress. To avoid this, always ensure the input voltage remains at or below 6 V.
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Engineer assumes the dropout voltage is negligible and operates the device at input voltages very close to the output voltage. The regulator may drop out of regulation when the input voltage falls below the output voltage plus the 0.35 V dropout at 250 mA load, causing output voltage to fall below specification. To fix this, maintain at least 0.35 V headroom between input and output voltage under maximum load conditions.