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LTC1844-SD Datasheet(PDF) 1 Page - Linear Technology |
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LTC1844-SD Datasheet(HTML) 1 Page - Linear Technology |
1 / 12 page 1 LTC1844 Series 1844ia 150mA, Micropower, Low Noise, VLDO Linear Regulator May 2003 s Very Low Dropout: 90mV at 150mA 30mV at 50mA (LTC1844-3.3) s Wide Input Voltage Range: 1.6V to 6.5V s Low 35 µA Supply Current, Even in Dropout s Low Noise: 30 µVRMS (10Hz to 100kHz) s ±1.75% Voltage Accuracy Over Temperature, Voltage and Current Ranges s Fast Transient Response s 10nA Supply Current in Shutdown s Fixed Output Voltages: 1.5V, 1.8V, 2.5V, 2.8V, 3.3V s Adjustable Output Voltage: 1.25V to 6V s Output Current Limit s Reverse-Battery and Reverse-Current Protection s No Protection Diodes Needed s Stable with 1 µF Output Capacitor s Stable with Ceramic Capacitors s Short-Circuit and Thermal Overload Protection s Low Profile (1mm) SOT-23 Package Fixed Voltage Low Noise, VLDO Linear Regulator s Bluetooth/802.11 Cards s PDAs and Notebook Computers s Portable Instruments and Battery-Powered Systems s Cellular Phones FEATURES DESCRIPTIO APPLICATIO S TYPICAL APPLICATIO The LTC ®1844 Series are low noise VLDO TM (very low dropout) linear regulators designed for low power/portable applications. These regulators can operate from input voltages as low as 1.6V. Typical output noise is only 30 µVRMS and typical dropout for the LTC1844-3.3 is just 90mV at the maximum load current of 150mA, reducing to 30mV at 50mA. The internal P-channel MOSFET pass transistor requires no base current, allowing the device to draw only 35 µA during normal operation, independent of the dropout voltage and load current. The quiescent current falls to a negligible 10nA during shutdown. Other features include high output voltage accuracy, excellent transient response, stablity with ultralow ESR ceramic capacitors as small as 1 µF, reverse-battery and reverse-current protection, short-circuit and thermal overload protection and output current limiting. The LTC1844 regulators are available in a low profile (1mm) SOT-23 (ThinSOT TM) package. , LTC and LT are registered trademarks of Linear Technology Corporation. Final Electrical Specifications Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. IN SHDN 1844 TA01 1 µF LTC1844-3.3 OUT VOUT 3.3V VIN 3.3V TO 6.5V BYP GND 0.1 µF 1 µF OFF ON 5 4 2 3 1 VLDO and ThinSOT are trademarks of Linear Technology Corporation. LTC1844-3.3 Dropout Voltage vs Load Current IOUT (mA) 0 0 20 40 60 80 120 100 25 50 75 100 1844 TA02 125 150 |
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