The model " ADP1755ACPZ-R7 " belongs to Analog Devices (ADI), a renowned brand specializing in high-performance analog, mixed-signal, and digital signal processing technologies.
Packaging for ADP1755ACPZ-R7
The ADP1755ACPZ-R7 is typically packaged in a 14-lead LFCSP (Lead Frame Chip Scale Package) with a pitch of 0.5mm.
Pin Function Specifications and Circuit Principle
The ADP1755ACPZ-R7 is a low dropout regulator (LDO) designed to provide a stable and accurate output voltage with minimal input-output voltage difference. It features:
Output voltage range: 0.8V to 5.5V Output current: Up to 600mA Low quiescent current: Ideal for battery- Power ed applications Low dropout voltage: Ensures efficient operation even with minimal headroomPin Function Table for ADP1755ACPZ-R7
Pin Number Pin Name Pin Type Pin Function Description 1 IN Power Input This is the input pin for the regulator. The input voltage should be higher than the output voltage by at least the dropout voltage for proper operation. It can handle voltages up to 5.5V. 2 OUT Power Output The output pin provides the regulated voltage. Connect the load to this pin. It outputs the voltage according to the selected voltage level (can range from 0.8V to 5.5V). 3 EN Input Control This is the enable pin. Applying a logic high signal enables the regulator. A logic low signal disables it. 4 GND Ground Connect this pin to the ground of the system to complete the circuit. 5 NC No Connect This pin is not connected to any internal circuitry and can be left floating or unused. 6 VOUT Output Voltage This is the voltage sensing pin for the output. It ensures that the output voltage is maintained as per the feedback loop. 7 FB Feedback This is the feedback pin used to set the output voltage. It is part of a feedback loop that controls the regulation of the output voltage. 8 PGND Power Ground This is a dedicated ground pin for the internal power circuitry. Connect to system ground. 9 VINA Input Voltage This is the internal voltage pin connected to the input. It may be used internally for sensing purposes. 10 DNC Do Not Connect This pin is not used and should not be connected to any external circuit. 11 RSET Resistor Set Connect a resistor between this pin and ground to set the output voltage. 12 VDD Power Supply This pin provides power to the internal circuitry of the regulator. 13 VSSA Signal Ground Ground pin for the signal circuitry of the regulator. 14 BIAS Bias Voltage Pin that provides bias for the internal components of the LDO.Circuit Principle
The ADP1755ACPZ-R7 uses a feedback-based regulation method that senses the output voltage at the FB (feedback) pin, comparing it to the reference voltage. If the output voltage deviates from the desired level, the regulator adjusts the pass element to correct the voltage.
The output voltage is set by an external resistor network connected between the FB pin and ground. The feedback mechanism ensures that the output voltage is stable and consistent across varying input voltages and loads.
FAQ (Frequently Asked Questions)
Q1: What is the input voltage range for ADP1755ACPZ-R7? A1: The input voltage for the ADP1755ACPZ-R7 can range from 1.8V to 5.5V.
Q2: What is the maximum output current of ADP1755ACPZ-R7? A2: The ADP1755ACPZ-R7 can supply a maximum output current of 600mA.
Q3: How is the output voltage of ADP1755ACPZ-R7 set? A3: The output voltage is set using an external resistor divider connected to the FB pin.
Q4: What is the dropout voltage of ADP1755ACPZ-R7? A4: The dropout voltage is typically 40mV at 100mA load, and it increases with higher output currents.
Q5: Can I use ADP1755ACPZ-R7 for a 3.3V application? A5: Yes, you can configure the ADP1755ACPZ-R7 to output 3.3V by selecting appropriate resistors for the feedback loop.
Q6: What is the quiescent current of ADP1755ACPZ-R7? A6: The quiescent current is typically 25µA, making it suitable for low-power applications.
Q7: Can ADP1755ACPZ-R7 operate with a 1.8V input voltage? A7: Yes, the ADP1755ACPZ-R7 can operate with input voltages as low as 1.8V, as long as the output voltage is higher than the dropout voltage.
Q8: Is ADP1755ACPZ-R7 adjustable for different output voltages? A8: Yes, the output voltage can be adjusted using a resistor network on the FB pin, allowing for a wide range of output voltages.
Q9: How do I disable the ADP1755ACPZ-R7? A9: The ADP1755ACPZ-R7 can be disabled by pulling the EN (enable) pin low.
Q10: What is the output voltage accuracy of ADP1755ACPZ-R7? A10: The output voltage accuracy is ±1%, ensuring precise regulation at the selected output voltage.
Q11: Does ADP1755ACPZ-R7 have thermal protection? A11: Yes, the ADP1755ACPZ-R7 includes thermal shutdown protection to prevent damage due to overheating.
Q12: Can ADP1755ACPZ-R7 be used in battery-powered systems? A12: Yes, with its low quiescent current and low dropout voltage, the ADP1755ACPZ-R7 is ideal for battery-powered applications.
Q13: What is the typical output voltage ripple of ADP1755ACPZ-R7? A13: The output voltage ripple is typically very low due to the LDO's high power supply rejection ratio (PSRR).
Q14: What is the maximum power dissipation of ADP1755ACPZ-R7? A14: The maximum power dissipation depends on the input-output voltage difference and output current. Power dissipation can be calculated as ( P = (V{IN} - V{OUT}) \times I_{OUT} ).
Q15: Can ADP1755ACPZ-R7 be used with ceramic capacitor s? A15: Yes, ADP1755ACPZ-R7 is compatible with ceramic capacitors, which help improve stability and transient response.
Q16: What is the typical response time for ADP1755ACPZ-R7 to load changes? A16: The typical response time for the ADP1755ACPZ-R7 is less than 10µs, ensuring fast response to load transients.
Q17: What is the recommended external capacitor for ADP1755ACPZ-R7? A17: A 10µF ceramic capacitor is recommended at the input and output for stable operation.
Q18: How do I calculate the required resistors for setting the output voltage? A18: The resistors can be calculated using the formula ( V{OUT} = V{REF} \times (1 + R1/R2) ), where ( V_{REF} ) is the reference voltage (typically 0.8V for ADP1755ACPZ-R7).
Q19: Is there an overcurrent protection feature in ADP1755ACPZ-R7? A19: Yes, the ADP1755ACPZ-R7 includes overcurrent protection to prevent damage from excessive current draw.
Q20: What is the minimum input voltage for proper regulation of ADP1755ACPZ-R7? A20: The minimum input voltage for proper regulation depends on the output voltage. For example, if the output is set to 1.8V, the input should be at least 2.0V (accounting for the dropout voltage).
This detailed explanation of the ADP1755ACPZ-R7 includes all the pin functions, package details, circuit principles, and frequently asked questions to guide usage.
