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LTC3035 Datasheet(PDF) 1 Page - Linear Technology |
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LTC3035 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 12 page  LTC3035 1 3035f ■ 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 1 µF ■ Output Current Limit ■ Thermal Overload Protected ■ Reverse Output Current Protected ■ Available in 8-Lead (3mm × 2mm) DFN Package TYPICAL APPLICATIO FEATURES DESCRIPTIO The LTC ®3035 is a micropower, VLDO™ (very low drop- out) 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 nec- essary 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 0.1 µF 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, ex- cellent transient response, stability with ultralow ESR ceramic capacitors as small as 1 µF, short-circuit and thermal overload protection, output current limiting and reverse output current protection. The LTC3035 is avail- able in a tiny, low profile (3mm × 2mm × 0.75mm) 8-lead DFN package. 300mA VLDO Linear Regulator with Charge Pump Bias Generator APPLICATIO S ■ 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 3.3V Output Voltage from Li-Ion Battery , LTC and LT are registered trademarks of Linear Technology Corporation. VLDO is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 6411531, others pending. IOUT (mA) 0 70 60 50 40 30 20 10 0 150 250 3035 TA01b 50 100 200 300 TA = 25°C Dropout Voltage vs Load Current CP 0.4V IN SHDN GND Li-Ion BATTERY 3.4V TO 4.2V 1 µF 0.1 µF CBIAS 1 µF COUT 1 µF 3035 TA01a 294k 40.2k VOUT 3.3V 300mA OFF ON CM BIAS OUT ADJ BIAS GENERATOR LTC3035 + – |
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