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LTC3035 - 300mA VLDO Linear Regulator with Charge Pump Bias Generator

The LTC3035 is a micropower, VLDO (very low dropout) linear regulator which operates from input voltages as low as 1.7V. The device is capable of supplying 300mA of output current with a typical dropout voltage of only 45mV. To allow operation at low input voltages the LTC3035 includes a charge pump generator that provides the necessary bias voltage for the internal LDO circuitry. Output current comes directly from the input supply for high efficiency regulation. The charge pump bias generator requires only a 0.1μF flying capacitor and a 1μF bypass capacitor for operation. The low 0.4V internal reference voltage allows the LTC3035 to be programmed to much lower output voltages than commonly available in LDOs. The output voltage is programmed via two tiny SMD resistors. The LTC3035’s low quiescent current makes it an ideal choice for use in battery-powered systems.

Other features include high output voltage accuracy, excellent transient response, stability with ultralow ESR ceramic capacitors as small as 1μF, short-circuit and thermal overload protection, output current limiting and reverse output current protection. The LTC3035 is available in a tiny, low profile (3mm × 2mm × 0.75mm) 8-lead DFN package.

Features Wide Input Voltage Range: 1.7V to 5.5V Wide Adjustable Output Voltage Range: 0.4V to 3.6V Built-In Charge Pump Generates High Side Bias Very Low Dropout: 45mV at 300mA ± 2% Voltage Accuracy Over Temperature, Supply, Load Fast Transient Recovery Low Operating Current: IIN = 100μA Typ Low Shutdown Current: IIN = 1μA Typ Stable with Ceramic Capacitor Down to 1μF Output Current Limit Thermal Overload Protected Reverse Output Current Protected Available in 8-Lead (3mm × 2mm) DFN Package Typical Application

Applications Li-Ion to 3.3V Low Dropout Supplies 2 × AA to 1.8V Low Dropout Supplies Low Power Handheld Devices Low Voltage Logic Supplies DSP Power Supplies Cellular Phones Portable Electronic Equipment Handheld Medical Instruments Post Regulator for Switching Supply Noise Rejection Packaging

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