A linear regulator is a kind of voltage regulator chip that performs as a variable resistor in reply to changes within input voltage (or) output current to maintain output voltage regulation. So these are the basic building blocks in every power supply utilized in electronics. The linear regulator IC is very easy to utilize that it is almost foolproof, and so low-cost that it is generally one of the lowest components within an electronic assembly. A linear regulator works with a voltage-controlled current source to force a stable voltage to emerge at the regulator output terminal. Thus, the examples of linear regulator ICs are; MIC5219 IC, LM1117S, LM1117S, LP2985, L7805CV, L7805ACD2T, REG1117, LD1117S33CTR, L7805CV, AP2112K, etc. This article elaborates on MIC5219 IC, pinout, specifications, and its applications.
What is MIC5219 IC?
The MIC5219 is a linear voltage regulator IC from Microchip Technology that supplies a peak output current mainly for start-up conditions. This IC is available in different packages: like MLF, SOT 23 5, Thin MLF, and power MSOP packages. So this is a very efficient IC with high peak output current ability, and extremely low dropout voltage, and its output voltage accuracy is better than 1%. Its dropout voltage is normally 10 mV at light loads and < 500 mV at complete load.
How does MIC5219 IC Work?
The MIC5219 linear voltage regulator IC works by providing a fixed output voltage: So this IC utilizes an active pass element to decrease the voltage from input to a regulated output without dropping much voltage across the voltage regulator. So it provides an output voltage nearly close to the input voltage. This MIC5219 IC is designed mainly to provide a peak output current for start-up conditions wherever a higher inrush current is required.
The MIC5219 has 500 mAmps of peak output rating so its continuous output current can be limited by package & layout only. Thus, this IC can be enabled or disabled through a CMOS or TTL-compatible signal. Once this IC is disabled, then power consumption will reduce almost to zero. Its Dropout ground current is reduced to help extend battery life.
MIC5219 IC Pin Configuration:
The pin configuration of MIC5219 IC is shown below. So this IC includes five pins which are explained below.
MIC5219 IC Pin Configuration
- Pin-1 (IN): It is an input supply pin that provides voltage to the linear regulator IC.
- Pin-2 (GND): It is a ground pin of IC.
- Pin-3 (EN): It is enabled or shut down the pin of the IC. When the input is logic-high then it is enabled and it will shut down if the input is logic-low (or) open.
- Pin-4 (BYP/ADJ): It is an Adjustable regulator feedback input pin that is connected to a resistor voltage divider.
- Pin-5 (OUT): It is a voltage regulator output pin.
Features & Specifications:
The features of MIC5219 IC include the following.
- MIC5219 IC is a linear voltage regulator.
- This IC is available in MLF, Thin MLF, SOT 23 5 & power MSOP packages.
- This IC has low noise performance.
- Its output is fixed or adjustable.
- When it is disabled then the power consumption will drop almost to zero
- Output current ability is 500 mA.
- Its maximum dropout voltage at full load is 500 mV.
- The input voltage of this regulator ranges from 2.5V to 12V.
- The output voltage of this regulator ranges from 2.5V to 5V.
- It has very tight load & line regulation.
- This IC has ultra-low noise output, reversed-battery protection, low-temperature coefficient, and current & thermal limiting.
- It is compatible with CMOS/TTL and Enable/Shutdown control.
Equivalents & Alternatives
Equivalents to MIC5219 ICs are; MAX3890, SPX3819, LP2989m etc. So alternative LDO regulator ICs are; AMS1117, LP2985, MIC5225, etc.
MIC5219 Adjustable Regulator Circuit
The basic MIC5219 adjustable regulator circuit is shown below. This IC is a high-performance-based LDO regulator that has a low ground current & low dropout voltage, so it is used in battery-powered applications. MIC5219 IC provides ±1% of output voltage accuracy which delivers an output current of up to 500 mA.
The MIC5219 IC can also have logic-compatible enable or shutdown control input, thermal shutdown, and over current protections. So this regulator IC is accessible in different fixed & adjustable o/p voltage versions. The high-power supply rejection ratio and ultra-low dropout voltage make it perfect for noise-sensitive applications.
Thus, the required components to make this MIC5219 adjustable regulator circuit include; MIC5219 IC, 470pF bypass capacitor, 2.2uF capacitor, and resistors. Connect this circuit as per the diagram shown below.
MIC5219 Adjustable Regulator Circuit
Working
In the above basic MIC5219 adjustable regulator circuit, the output voltage can be simply adjusted to a particular value by choosing R1 and R2 values with the below formula.
V = 1.242V* (R2\R1 + 1)
In the above circuit, the 470pF bypass capacitor is connected from the ADJ pin to GND to decrease the output noise. So the Adj pin sets the output voltage of the IC to the necessary value while the EN pin is used to turn on (or) off the regulator IC. Thus, this helps in turning off the voltage regulator and avoids battery usage whenever it is not in use.
Advantages & Disadvantages
The advantages of MIC5219 IC include the following.
- This IC is available in different packages.
- It has a high peak output current capability.
- This IC has a low dropout voltage.
- It is better than 1% output voltage accuracy.
- This IC has reversed battery protection.
- It has current limiting and over-temperature shutdown.
- It occupies less space.
- This IC has a quick transient reaction.
- It is very simple to design with in-built protection, …
- They have less voltage noise & ripple rejection capability.
- These ICs are low-cost and have outstanding load regulation.
The disadvantages of MIC5219 IC include the following.
- These regulators have low efficiency, particularly when there is a huge variation between the I/O voltages.
- These ICs output a voltage that is below the input voltage.
- They dissipate surplus power as heat thus a heat sink is required.
- They cannot invert a positive supply, thus they cannot be utilized whenever some analog circuitry needs a negative voltage.
Applications
The applications of MIC5219 IC include the following.
- MIC5219 IC is used in computers, notebooks, laptops, cell phones, battery-powered devices, etc.
- These are used in consumer electronics, PC cards, SMPS post-regulators, linear power supplies, etc.
- It is used in VPP regulation/switching & PCMCIA VCC.
- It is personal and consumer electronics.
- This IC is used in high-efficiency linear power supplies.
- It is used in DC/DC modules & SMPS post regulators.
Please refer to this link for the MIC5219 IC Datasheet.
Thus, this is an overview of MIC5219 IC, pin-out, features, specifications, circuit, working, pros, cons, and its uses. This is an efficient linear voltage regulator IC that is suitable for linear voltage supplies and battery-powered equipment. Here is a question for you, what is LP2985 IC?