AMS1117 Voltage Regulator Replacements, Manufacturer, Features, Working Principle and Applications

Ⅰ. Overview of AMS1117

Ⅱ. Manufacturer of AMS1117 voltage regulator

Ⅲ. What are the features of AMS1117 voltage regulator?

Ⅳ. AMS1117 symbol, footprint and pin configuration

Ⅴ. Structure and working principle of AMS1117 voltage regulator

Ⅵ. Applications of AMS1117 voltage regulator

Ⅶ. Application circuit of AMS1117 voltage regulator

A voltage regulator is a device that controls the output voltage of an appliance to protect the stability and safety of circuits and devices. AMS1117 is a low-dropout linear voltage regulator that has a wide range of applications in power management circuits. In this article, we will introduce its concept, manufacturer, features, structure as well as working principle and applications to help you better understand and apply the chip.

AMS1117 is a linear voltage regulator capable of stabilizing a high voltage input to a low voltage output. It is available in adjustable and multiple fixed voltage versions, and is designed to provide 1A output current with an operating dropout as low as 1V. The AMS1117 is guaranteed to have a minimum dropout of no more than 1.3V at maximum output current, and this will gradually decrease as the load current decreases.

The AMS1117 is available in a number of different models, of which the AMS1117-3.3 and AMS1117-5.0 are commonly used. The "3.3" and "5.0" represent its output voltage, which corresponds to 3.3V and 5V, respectively. The AMS1117 chip is internally designed with thermal protection and current limiting circuits, which makes it an ideal choice for battery-powered and portable computers. The AMS1117 chip is designed with internal thermal protection and current limiting circuitry, making it ideal for battery-powered and portable computers. This chip serves as a common power solution for almost all kinds of applications such as LEDs, audio and video.

Replacements and equivalents:

• LM1117

• LM317

• LM7805

• NTE9060

The AMS1117 is manufactured by AMS. AMS is a well-known brand in the field of electronic technology. It has high technical strength and market share in audio chips, sensors, interface chips and other fields. It is a leading global semiconductor company dedicated to developing and manufacturing a variety of high-quality, high-performance analog and digital semiconductor devices.

The company's main products include Austria Micro Systems LED drivers, Austria Micro Systems position sensors, Austria Micro Systems ultrasonic flow converters, Austria Micro Systems light sensors, image sensors, audio sensors and environmental sensors. These products are widely used in various fields such as automotive electronics, medical equipment and smartphones.

• Output short circuit protection: Some models of the AMS1117 include output short circuit protection to prevent damage caused by output short circuits.

• Overheating protection: AMS1117 usually has overheating protection function. When the chip temperature exceeds a certain threshold, it takes steps to prevent overheating damage.

• Over-current protection: It may also have an over-current protection mechanism to prevent the output current from exceeding the maximum specified by the chip.

• Low dropout voltage: When outputting 1A current, the typical voltage difference between its input and output is only 1.4V.

• AMS1117 provides stable output voltage and usually has multiple optional output voltage versions, such as 3.3V, 5V, etc.

The pictures above are the symbol, footprint and pin configuration of AMS1117. Among them, AMS1117 has a total of three pins, whose names and descriptions are as follows.

Pin 1 (Ground): This pins adjusts the output voltage, if it is a fixed voltage regulator it acts as ground.

Pin 2 (Vout): The regulated output voltage set by the adjust pin can be obtained from this pin.

Pin 3 (Vin): The input voltage which has to be regulated is given to this pin.

The working principle of the AMS1117 voltage stabilizing circuit is based on the mechanism of a linear voltage regulator. Its core is a three-terminal voltage regulator chip, including input terminal, output terminal and ground terminal. The input terminal is connected to the input power supply, the output terminal is connected to the load, and the ground terminal is connected to the ground wire.

When the input voltage exceeds the nominal stable output voltage of the chip, the chip converts the excess voltage into heat and dissipates it through the internal circuit to maintain a stable output voltage. However, when the input voltage is lower than the chip's nominal stable output voltage, the chip will provide additional current through the internal circuit to keep the output voltage stable.

1. Power filter

AMS1117 can be used with capacitors to form a power supply filter to improve the anti-interference ability of the entire circuit. We should choose the capacitance of the capacitor based on the load current and the required level of noise suppression.

2. Power protection

AMS1117 has built-in overload protection and overheating protection functions, which can effectively protect the circuit. If the load current is too large or the ambient temperature is too high, the AMS1117 will immediately interrupt the output to protect the load and itself.

3. Power supply voltage stabilization

The AMS1117 regulates the input voltage. In practical applications, we can choose the appropriate output voltage according to needs. For example, by appropriately adjusting the parameters of AMS1117, we can regulate the input 12V voltage to 5V to provide stable power supply for microcontrollers, sensors and other equipment.

4. Circuit adaptation

AMS1117 can adjust the voltage of different circuits to an appropriate voltage. For example, the input voltage of 9V can be adjusted by AMS1117 to obtain a voltage of 3.3V. This voltage regulator is particularly suitable for powering SD cards, signal generators and other devices.

1. USB power supply circuit

In the USB power supply circuit, the AMS1117 chip can stabilize the 5V voltage output by the USB interface to 3.3V for use by other circuits. At this time we need to pay attention that the input voltage should not exceed the maximum operating voltage of the AMS1117 chip (usually 15V), otherwise the chip may be damaged.

2. Battery charging circuit

In the battery charging circuit, the AMS1117 chip can be used as a discharge protection chip. When the battery voltage drops to a certain level, the chip will automatically cut off the circuit to prevent excessive discharge of the battery and protect battery life.

3. Single battery power supply circuit

The AMS1117 chip functions as a voltage regulator in the power supply circuit with a single battery, ensuring the stability of the output voltage at 3.3V for other circuits. It is crucial to note that the input voltage must not fall below the AMS1117 chip's minimum operating voltage (typically 4.5V) to prevent improper functioning of the chip.

4. Multi-battery power supply circuit

In a multi-battery power supply circuit, the AMS1117 chip can stabilize the output voltage of multiple batteries to 3.3V by connecting multiple chips in series or parallel for use by other circuits. Please ensure that the output voltages of each chip are equal to avoid current imbalance.

5. AMS1117 voltage stabilizing circuit

AMS1117 is a low-leakage voltage regulator whose voltage regulation mechanism is composed of a PNP-driven NPN transistor. The leakage voltage is defined as: VDROP=VBE+VSAT.

The AMS1117 is available in fixed and adjustable versions with output voltage ranges of: 1.2V, 1.5V, 1.8V, 2.5V, 2.85V, 3.0V, 3.3V, and 5.0V. On-chip thermal shutdown circuitry provides overload and overtemperature protection against excessive junction temperatures caused by ambient temperatures. To ensure the stability of the AMS1117, it is recommended to connect a tantalum capacitor of at least 22μF at the output for the adjustable voltage version. For the fixed voltage version, we can use smaller size capacitors, the specific choice should be based on the actual application requirements. Typically, linear regulator stability may decrease as output current increases.

Frequently Asked Questions

1. What is the AMS1117?

The AMS1117 series of adjustable and fixed voltage regulators are designed to provide up to1A output current and to operate. down to 1V input-to-output differential. The dropout voltage of the device is guaranteed maximum 1.3V, decreasing at lower load currents.

2. What is the AMS1117 5V to 3.3 V?

The AMS1117-3.3 LDO 800MA DC 5V to 3.3V Step-Down Power Supply Module is capable of supplying very stable 3.3V-5V DC when supplied with 4.5V-15V DC. The module is capable of altering the output of the power source/supply before supplying it to the load so as to deliver the specified power to your load.

3. What is AMS1117 in series?

The AMS1117 series of adjustable and fixed voltage regulators are designed to provide up to 1A output current and to operate down to 1.2V input-to-output differential. The dropout voltage of the device is guaranteed maximum 1.3V, decreasing at lower load currents. On-chip trimming adjusts the reference voltage to 1.5%.

4. What is the alternative to AMS1117?

For example, there's K1254EN, IL1117A, and LD1117A. Furthermore, you've probably heard of LM1117. It's similar to ams1117 but differs in some features, like its SOT-223 version having 800mA maximum current. Moreover, you can substitute the voltage regulators with NTE9060, LM317, or LM7805.