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MCP1700T-3302E TTVAO

250mA LDO, 3.3V fixed, 1µA Iq, 178mV dropout, SOT-89-3, AEC-Q100

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Manufacturer Part：

MCP1700T-3302E TTVAO

Package：

SOT-89-3 (4.5 x 2.5 x 1.5 mm)

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Description

Product Overview

The Microchip MCP1700T-3302E TTVAO is a 250 mA CMOS low-dropout (LDO) linear regulator with a fixed 3.3 V output and ultra-low quiescent current of 1.0 µA. It features a low dropout voltage of 178 mV at 250 mA and supports an input voltage range of 2.0 V to 6.0 V. Housed in a SOT-89-3 package, it is designed for battery-powered and automotive applications.

Key Specifications

Output Voltage 3.3 V (fixed)
Maximum Output Current 250 mA
Input Voltage Range 2.0 V to 6.0 V
Dropout Voltage 178 mV @ 250 mA
Quiescent Current 1.0 µA (typical)
Output Voltage Accuracy ±2% (±0.5% typical)
PSRR 52 dB @ 1 kHz
Operating Temperature -40 °C to +125 °C
Package SOT-89-3

Features

  • Ultra-low quiescent current: 1.0 µA typical
  • Low dropout: 178 mV at 250 mA load
  • Stable with 1 µF ceramic output capacitor
  • High output voltage accuracy: ±0.5% typical
  • Short-circuit and over-temperature protection
  • Automotive AEC-Q100 qualified
  • No reverse current flow from output to input

Applications

  • Automotive ECU power supply
  • Battery-powered IoT and wireless sensors
  • MCU and peripheral rail regulation
  • Portable medical devices

The Microchip MCP1700T-3302E TTVAO is a low-quiescent-current CMOS LDO regulator providing a fixed 3.3 V output at up to 250 mA. Its 1.0 µA typical ground current makes it one of the industry’s lowest Iq LDOs, ideal for always-on battery-powered applications where standby current directly impacts battery life. The 178 mV dropout voltage at full load allows operation with minimal headroom from batteries or switching pre-regulators. The device is stable with just 1 µF of output capacitance (ceramic), enabling compact PCB layouts. AEC-Q100 qualification and -40 °C to +125 °C operating range support automotive power management applications. Short-circuit current limiting and over-temperature shutdown protect the device and system from fault conditions. The SOT-89-3 package provides better thermal performance than SOT-23 due to its larger thermal pad.

The MCP1700 uses a PMOS pass transistor controlled by a precision voltage reference and error amplifier. The error amplifier compares a fraction of the output voltage (via an internal resistor divider) with the internal bandgap reference (1.2 V typical). Any difference drives the gate of the PMOS pass element to maintain the output at 3.3 V. The PMOS topology is key to achieving the low 1.0 µA quiescent current — unlike bipolar LDOs that require significant base drive current, a MOSFET gate draws essentially zero DC current. The dropout voltage is the minimum VGS required to keep the PMOS in saturation, which is 178 mV at 250 mA. The device includes current limiting that folds back the output current during a short circuit, and a thermal shutdown that disables the output when junction temperature exceeds approximately 150 °C. No reverse current flows from output to input due to the body diode orientation of the PMOS device, eliminating the need for an external blocking diode in battery-backup applications.

Pin Name Type Function
1 GND Ground Ground connection
2 VIN Input Unregulated input voltage (2.0-6.0V)
3 VOUT Output Regulated 3.3V output
  • Automotive ECU always-on 3.3V rail from battery
  • IoT sensor node power from coin cell or Li-Ion battery
  • Post-regulator for switching supply in noise-sensitive circuits
  • Portable medical device battery regulation
Manufacturer Part Number Package Notes
TI TPS7A0233PDBVR SOT-23-5 25µA Iq, lower noise
Richtek RT9013-33GB SOT-89-3 Similar LDO, higher Iq
onsemi NCP511SN33T1G SOT-23-5 150mA, lower dropout
Microchip MCP1703AT-3302E CB SOT-23-3 250mA, 2-16V input range
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