MIC2211-FQBML-TR

Current - Output:	150mA, 300mA
Base Part Number:	MIC2211
Supplier Device Package:	10-MLF® (3x3)
Package / Case:	10-VFDFN Exposed Pad, 10-MLF®
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C
Protection Features:	Over Current, Over Temperature
Control Features:	Enable
PSRR:	60dB ~ 40dB (1KHz ~ 20kHz)
Current - Quiescent (Iq):	80µA
Series:	--
Voltage Dropout (Max):	0.25V @ 150mA, 0.42V @ 300mA
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	1.5V, 3.1V
Voltage - Input (Max):	5.5V
Number of Regulators:	2
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Discontinued at Digi-Key
Packaging:	Tape & Reel (TR)

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MIC2211-FQBML-TR Application field and Working Principle

The MIC2211-FQBML-TR is a fully integrated, single chip, “smart” low noise, low dropout, low power, high frequency linear voltage regulator. This part is ideal for portable and handheld applications such as cell phones, PDAs, and other battery-powered systems. Due to its low external component count, compact surface mount package option, low noise output, and high output current capability, the MIC2211-FQBML-TR voltage regulator provides designers with an array of flexibility when designing battery-powered systems.

Features

The MIC2211-FQBML-TR voltage regulator offers many features that make it particularly suitable for portable, battery-powered applications. The major features of the device are:- High Voltage, Low Noise Linear Regulator: The MIC2211-FQBML-TR operates with input voltages from 1.8 V to 5.5 V and can deliver up to 800 mA of output current. The device operates with a very low noise design; just 7.5μVRMS for 800 mA. This ensures that the supply voltage and especially the noise, does not affect the system performance.- Low Power Dissipation: The device can achieve an average efficiency of 90%, meaning that it dissipates only a fraction of the output power as heat, thus extending battery life.- Low Dropout Voltage: The MIC2211-FQBML-TR offers a low dropout voltage of just 0.1 V at 800 mA; allowing more power to be delivered to demanding portable applications, without the need of bulky heat sinks.- Extended Load Current Range: With a regulated output voltage of either 1.8 V, 2.5 V, 3.3 V and 4.2 V and up to 800 mA, the MIC2211-FQBML-TR provides an extended load current range for various battery-powered applications.- Small Footprint: The MIC2211-FQBML-TR is available in a tiny 4-pin SOT-23, providing designers with a small footprint and no external components are required. This allows for very compact designs.

Applications

The MIC2211-FQBML-TR is well suited for battery powered systems. It is especially designed for handheld and portable applications such as cell phones, PDAs, cordless phones, digital cameras, and notebook computers.

Working Principle

The MIC2211-FQBML-TR is based on a low-noise linear voltage regulator topology and is capable of delivering up to 800 mA of output current with a low dropout voltage of 0.1 V. The device is a monolithic integrated circuit that is composed of a main internal volt regulator, a MOSFET switch, a low dropout (LDO) linear regulator, control logic, an on/off control pin, and an enable/disable protection pin. The enable/disable protection pin offers the system the ability to enable and disable the regulator in order to prevent the system from over-loading the battery in the event of a short circuit or open circuit. The main voltage regulator is used to set the output voltage. It consists of an on-chip high-speed MOSFET switch and a low dropout (LDO) linear regulator. The switch is controlled by the digital control logic, which holds it “on” until the output voltage drops below the regulation point. When the voltage drops, the switch turns off and the MOSFET turns on, drawing more current from the input. The LDO regulator then regulates the voltage by monitoring the output voltage and controlling the current flow in the MOSFET. The device also has an on/off control pin that provides the system with an easy way to disable the regulator if needed. By tying the on/off pin to the ground, the regulator will be disabled and the output voltage will be floating. This will help the system conserve power by disabling the regulator when the system is in low power mode or when the device is not used. The MIC2211-FQBML-TR also has a slew rate control feature that helps reduce the output noise. This is especially useful in portable applications where noise may be more of an issue. By controlling the slew rate of the voltage output, the regulator is able to achieve lower output noise. To sum up, the MIC2211-FQBML-TR is an excellent choice for portable and battery powered applications that require low power dissipation, low dropout voltage, and low output noise. Its small footprint, extended load current range, and slew rate control make it a great solution for many types of applications.

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