5 PCS AMS1117-1.8 Low Dropout Linear Voltage Regulator 1.8V 800mA SOT-223

5 PCS AMS1117-1.8 Low Dropout Linear Voltage Regulator 1.8V 800mA SOT-223
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  • Product Code:SQ9826
  • Availability: 1000
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Tags: AMS1117-1.8, 1.8V voltage regulator, LDO regulator, SOT-223 regulator, 800mA regulator, low dropout regulator, fixed voltage regulator, AMS1117 series, 1.8V linear regulator, voltage regulator IC

The AMS1117-1.8 voltage regulator is a positive fixed-voltage low dropout (LDO) linear regulator designed to provide a stable 1.8V output from a wide input supply, making it a practical choice for low-voltage digital and mixed-signal circuits. Part of the widely used AMS1117 series, this regulator delivers up to 800mA of output current and operates with a maximum input voltage of 15V, covering common rails such as 3.3V, 5V, and 12V. The device is housed in the industry-standard SOT-223 surface-mount package, which offers a good balance between thermal performance and board space.

One of the defining characteristics of the AMS1117 family is its minimum load current requirement. To maintain output stability and prevent an abnormal rise in output voltage, a minimum load current must be present during operation. Designers should account for this requirement in the load calculations, particularly in circuits where the load may drop to very low levels or be disconnected. The regulator also features on-chip thermal limiting and over-current protection, safeguarding the device against excessive junction temperatures and fault conditions.

The AMS1117-1.8 achieves a power supply rejection ratio (PSRR) of 75dB at 120Hz, helping to suppress ripple from the input supply. Its quiescent current flows into the load rather than being wasted, which improves efficiency compared with traditional PNP-type regulators. With a specified operating junction temperature range of -40°C to +125°C, this regulator is suitable for high-efficiency linear power supplies, post-regulation of switching converters, battery chargers, and low-voltage microcontroller and FPGA rails. This product is supplied as a pack of five SOT-223 devices.

AMS1117-1.8 voltage regulator Application

  1. High-efficiency linear power supplies
  2. Post-regulation for switching DC-DC converters
  3. Battery chargers and battery-powered systems
  4. Low-voltage microcontroller and FPGA core supplies
  5. Motherboard clock and chipset power rails
  6. LCD monitors and set-top boxes
  7. PC add-on cards and peripheral power
  8. General-purpose 1.8V regulation in embedded systems

AMS1117-1.8 voltage regulator Specifications

  1. Product Model: AMS1117-1.8
  2. Regulator Type: Positive fixed-voltage LDO linear regulator
  3. Output Voltage: 1.8V (fixed)
  4. Output Voltage Accuracy: ±2% (fixed versions)
  5. Maximum Output Current: 800mA (Aftab Rayaneh rating) / 1A (device series capability)
  6. Maximum Input Voltage: 15V (Aftab Rayaneh rating)
  7. Dropout Voltage: 1.2V (typical at 1A) / 1.3V (maximum at 1A)
  8. Quiescent Current (Iq): 5mA (typical)
  9. Minimum Load Current: 3–10mA (required for stability)
  10. PSRR: 75dB at 120Hz
  11. Load Regulation: 0.5% maximum
  12. Line Regulation: 0.15% typical / 0.30% maximum
  13. Protection Features: Over-current protection, over-temperature (thermal) shutdown
  14. Operating Junction Temperature: -40°C to +125°C
  15. Package: SOT-223 (3-pin + tab)
  16. Pin Configuration: Pin 1: GND/ADJ, Pin 2: VOUT, Pin 3: VIN
  17. Recommended Output Capacitor: 10µF tantalum (minimum)
  18. Packaging: Pack of 5 pieces

Features

  1. Fixed 1.8V output with ±2% accuracy
  2. Low dropout voltage of 1.2V typical at 1A
  3. Output current capability of 800mA (Aftab Rayaneh rating)
  4. Maximum input voltage of 15V (Aftab Rayaneh rating)
  5. Quiescent current of 5mA that flows into the load for improved efficiency
  6. Power supply rejection ratio (PSRR) of 75dB at 120Hz
  7. On-chip thermal limiting and over-current protection
  8. Minimum load current requirement for stable output voltage
  9. Industry-standard SOT-223 surface-mount package
  10. Requires only a 10µF tantalum output capacitor for stability
  11. Operating junction temperature range of -40°C to +125°C
  12. Available as a pack of five devices for prototyping and production

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