Overview
The ADM7170ACPZ-3.3-R7 is a CMOS, low dropout linear regulator (LDO) produced by Analog Devices Inc. This regulator operates from an input voltage range of 2.3 V to 6.5 V and provides up to 500 mA of output current. It is designed to offer high performance in a compact package, making it suitable for various applications requiring low noise and high stability.
The device is available in an 8-lead, 3 mm × 3 mm LFCSP (Lead Frame Chip Scale Package) with an exposed pad, which enhances thermal performance and reduces the overall footprint. The ADM7170ACPZ-3.3-R7 is specifically configured to provide a fixed output voltage of 3.3 V, with options for adjustable output voltage using external components.
Key Specifications
| Parameter | Value | Conditions |
|---|---|---|
| Input Voltage Range | 2.3 V to 6.5 V | |
| Output Voltage | 3.3 V (fixed) | |
| Output Current | Up to 500 mA | |
| Dropout Voltage | 42 mV typical at ILOAD = 500 mA, VOUT = 3 V, TA = 25°C | ILOAD = 500 mA, VOUT = 3 V, TA = 25°C |
| Output Noise | 5 μV rms typical at 100 Hz to 100 kHz, TA = 25°C | 100 Hz to 100 kHz, TA = 25°C |
| Power Supply Rejection Ratio (PSRR) | 60 dB typical at 100 kHz, VIN = 4 V, VOUT = 3 V, ILOAD = 500 mA | 100 kHz, VIN = 4 V, VOUT = 3 V, ILOAD = 500 mA |
| Quiescent Current | 0.7 mA typical at ILOAD = 0 μA, TA = 25°C | ILOAD = 0 μA, TA = 25°C |
| Shutdown Current | 0.25 μA typical at EN = GND, VIN = 5 V, TA = 25°C | EN = GND, VIN = 5 V, TA = 25°C |
| Operating Temperature Range | -40°C to +125°C | |
| Package Type | 8-lead LFCSP-WD with exposed pad |
Key Features
- Low Dropout Voltage: The ADM7170ACPZ-3.3-R7 features a low dropout voltage of 42 mV typical at 500 mA load, ensuring minimal voltage loss.
- Low Noise: The regulator has a low output noise of 5 μV rms typical, making it suitable for noise-sensitive applications.
- High PSRR: A power supply rejection ratio of 60 dB typical at 100 kHz enhances the regulator's ability to reject input noise.
- Adjustable Soft Start: The device includes an adjustable soft start feature to control the inrush current during startup.
- Current Limit and Thermal Overload Protection: The regulator is protected against excessive power dissipation with current limit and thermal overload protection, ensuring device safety.
- Enable/Disable Functionality: The EN pin allows for easy enable and disable of the output voltage, with programmable thresholds to prevent on/off oscillations.
- Compact Package: The 8-lead LFCSP-WD package with an exposed pad provides excellent thermal performance in a small footprint.
Applications
- Portable Electronics: Suitable for battery-powered devices due to its low quiescent current and high efficiency.
- Industrial Control Systems: Used in systems requiring stable and low-noise power supplies.
- Medical Devices: Ideal for medical equipment that demands high reliability and low noise.
- Aerospace and Defense: Can be used in various military and aerospace applications requiring robust and reliable power regulation.
- Automotive Systems: Applicable in automotive electronics that need stable power supplies over a wide temperature range.
Q & A
- What is the input voltage range of the ADM7170ACPZ-3.3-R7?
The input voltage range is from 2.3 V to 6.5 V.
- What is the fixed output voltage of the ADM7170ACPZ-3.3-R7?
The fixed output voltage is 3.3 V.
- What is the maximum output current of the ADM7170ACPZ-3.3-R7?
The maximum output current is up to 500 mA.
- What is the typical dropout voltage of the ADM7170ACPZ-3.3-R7?
The typical dropout voltage is 42 mV at ILOAD = 500 mA, VOUT = 3 V, and TA = 25°C.
- How does the soft start feature work on the ADM7170ACPZ-3.3-R7?
The soft start feature can be adjusted to control the inrush current during startup using the SS pin and an external capacitor.
- What protection mechanisms are included in the ADM7170ACPZ-3.3-R7?
The device includes current limit and thermal overload protection to prevent damage from excessive power dissipation.
- How can the enable/disable thresholds be adjusted on the ADM7170ACPZ-3.3-R7?
The enable/disable thresholds can be adjusted using external resistors REN1 and REN2 to prevent on/off oscillations.
- What is the operating temperature range of the ADM7170ACPZ-3.3-R7?
The operating temperature range is from -40°C to +125°C.
- What type of package does the ADM7170ACPZ-3.3-R7 come in?
The device comes in an 8-lead LFCSP-WD package with an exposed pad.
- What is the typical quiescent current of the ADM7170ACPZ-3.3-R7?
The typical quiescent current is 0.7 mA at ILOAD = 0 μA and TA = 25°C.
