Overview
The NCP5661DTADJRKG is a high-performance, low dropout linear regulator produced by onsemi. This device is designed for high power applications requiring up to 1.0 A of current. It is available in both fixed and adjustable output versions, with output voltages as low as 0.9 V. The NCP5661 features ultra-fast transient response times, low noise operation without a bypass capacitor, and a thermally robust design in 5-pin DPAK or DFN 3x3.3 mm packages.
Key Specifications
| Characteristic | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Input Voltage | Vin | 2.0 | 9.0 | V | |
| Output Voltage Accuracy (TJ = 25°C, Iout = 10 mA to 1.0 A) | Vout | -1% | +1% | % | |
| Dropout Voltage (Iout = 1.0 A) | VDO | 1.0 | 1.3 | V | |
| Peak Output Current Limit | Iout | 1.0 | A | ||
| Internal Current Limitation | Ilim | 1.5 | A | ||
| Ripple Rejection (120 Hz) | RR | 70 | dB | ||
| Thermal Shutdown | TSHD | 160 | °C | ||
| Ground Current (Iout = 1.0 A) | Iq | 1.3 | 3.0 | mA | |
| Enable Input Threshold Voltage | Ven | 0.3 | 1.3 | V |
Key Features
- Ultra-fast transient response time (settling time: 1-3 μs)
- Low noise operation without a bypass capacitor (26 μVrms)
- Low ground current independent of load (maximum 3.0 mA)
- Fixed and adjustable output voltage versions
- Enable function for on/off control
- Error Flag (for fixed output version) indicating output voltage status
- Current limit protection and thermal protection
- 0.9 V reference voltage for ultra-low output operation
- Power Supply Rejection Ratio (PSRR) > 65 dB
- AEC-Q100 qualified and PPAP capable for automotive and other critical applications
Applications
- Servers
- ASIC power supplies
- Post regulation for power supplies
- Constant current source
- Networking equipment
- Gaming and STB modules
Q & A
- What is the maximum output current of the NCP5661?
The maximum output current of the NCP5661 is 1.0 A.
- What are the available output voltage options for the NCP5661?
The NCP5661 is available in both fixed and adjustable output versions, with fixed output voltages ranging from 0.9 V to 3.3 V.
- What is the dropout voltage of the NCP5661 at 1.0 A output current?
The dropout voltage of the NCP5661 at 1.0 A output current is between 1.0 V and 1.3 V.
- Does the NCP5661 have thermal protection?
- What is the purpose of the Error Flag in the fixed output version?
The Error Flag in the fixed output version indicates when the output voltage drops below the nominal output voltage, producing a logic Low signal.
- How do I control the enable function of the NCP5661?
The enable function can be controlled by connecting the Enable pin to Ground to disable the device or to Vin to enable it.
- What is the recommended input capacitor for the NCP5661?
The recommended input capacitor is a 150 μF OSCON with an Equivalent Series Resistance (ESR) of 50 mΩ.
- What type of output capacitors should be used for stability?
For stability, low ESR type electrolytic capacitors (ESR < 300 mΩ) or multilayer ceramic capacitors should be used, with a minimum capacitance of 10 μF.
- Is the NCP5661 suitable for automotive applications?
- What is the typical ground current of the NCP5661 when it is disabled?
The typical ground current when the device is disabled is 10 μA.
