Overview
The NCP1117ST18T3 is a low-dropout positive voltage regulator from onsemi, part of the NCP1117 series. This regulator is designed to provide a high output current of up to 1.0 A with a maximum dropout voltage of 1.2 V at 800 mA over temperature. The device is available in fixed and adjustable output voltage configurations, making it versatile for various applications. The fixed output voltage versions include 1.5 V, 1.8 V, 1.9 V, 2.0 V, 2.5 V, 2.85 V, 3.3 V, 5.0 V, and 12 V, with no minimum load requirement to maintain regulation. The adjustable version can be programmed from 1.25 V to 18.8 V using two external resistors.
Key Specifications
| Characteristic | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Input Voltage | Vin | - | - | 20 | V |
| Output Current | Iout | - | - | 1.0 A | A |
| Maximum Dropout Voltage at 800 mA | Vdropout | - | - | 1.2 V | V |
| Reference Voltage (Adjustable Output Devices) | Vref | 1.238 | 1.25 | 1.262 | V |
| Output Voltage (Fixed Output Devices) - 1.8 V Version | Vout | 1.8 V | 1.8 V | 1.8 V | V |
| Adjustment Pin Current | Iadj | - | 52 | 120 | μA |
| Ripple Rejection (Vin-Vout = 6.4 V, Iout = 500 mA) | RR | 66 | - | - | dB |
| Thermal Shutdown | - | - | - | - | - |
| Package Types | - | - | - | SOT-223, DPAK | - |
Key Features
- Output Current in Excess of 1.0 A
- 1.2 V Maximum Dropout Voltage at 800 mA Over Temperature
- Fixed Output Voltages of 1.5 V, 1.8 V, 1.9 V, 2.0 V, 2.5 V, 2.85 V, 3.3 V, 5.0 V, and 12 V
- Adjustable Output Voltage Option from 1.25 V to 18.8 V
- No Minimum Load Requirement for Fixed Voltage Output Devices
- Reference/Output Voltage Trimmed to ±1.0% Accuracy
- Current Limit, Safe Operating Area Compensation, and Thermal Shutdown Protection
- Operation to 20 V Input
- NCV Prefix for Automotive and Other Applications Requiring Unique Site and Control Change Requirements; AEC-Q100 Qualified and PPAP Capable
- Pb-Free Devices
Applications
- Consumer and Industrial Equipment Point of Regulation
- Active SCSI Termination for 2.85 V Version
- Switching Power Supply Post Regulation
- Hard Drive Controllers
- Battery Chargers
Q & A
- What is the maximum output current of the NCP1117ST18T3?
The maximum output current is in excess of 1.0 A.
- What is the maximum dropout voltage at 800 mA over temperature?
The maximum dropout voltage is 1.2 V.
- What are the available fixed output voltages for the NCP1117 series?
The fixed output voltages are 1.5 V, 1.8 V, 1.9 V, 2.0 V, 2.5 V, 2.85 V, 3.3 V, 5.0 V, and 12 V.
- Can the output voltage be adjusted, and if so, what is the range?
Yes, the output voltage can be adjusted from 1.25 V to 18.8 V using two external resistors.
- Do the fixed voltage output devices require a minimum load to maintain regulation?
No, the fixed voltage output devices do not require a minimum load to maintain regulation.
- What are the internal protection features of the NCP1117 series?
The internal protection features include output current limiting, safe operating area compensation, and thermal shutdown.
- What is the maximum input voltage the NCP1117 series can operate with?
The maximum input voltage is 20 V.
- What package types are available for the NCP1117 series?
The devices are available in SOT-223 and DPAK packages.
- Are the NCP1117 devices Pb-free?
Yes, the devices are Pb-free.
- What are some common applications of the NCP1117 series?
Common applications include consumer and industrial equipment point of regulation, active SCSI termination, switching power supply post regulation, hard drive controllers, and battery chargers.
