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LTC3025EDC-4-TRPBF Datasheet(PDF) 1 Page - Linear Technology |
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LTC3025EDC-4-TRPBF Datasheet(HTML) 1 Page - Linear Technology |
1 / 12 page LTC3025-1/LTC3025-2/ LTC3025-3/LTC3025-4 1 30251234fc TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION 500mA Micropower VLDO Linear Regulators The LTC®3025-X is a micropower, VLDO™ (very low drop- out) linear regulator which operates from input voltages as low as 0.9V. The device is capable of supplying 500mA of output current with a typical dropout voltage of only 85mV. A BIAS supply is required to run the internal reference and LDO circuitry while output current comes directly from the IN supply for high efficiency regulation. The LTC3025-1 features an adjustable output with a low 0.4V reference while the LTC3025-2, LTC3025-3, and LTC3025-4 have fixed 1.2V, 1.5V and 1.8V output voltages respectively. The LTC3025-X’s low quiescent current makes it an ideal choice for use in battery-powered systems. For 3-cell NiMH and single cell Li-Ion applications, the BIAS voltage can be supplied directly from the battery while the input can come from a high efficiency buck regulator, providing a high efficiency, low noise output. 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 and output current limiting. The LTC3025-X is available in a tiny, low profile (0.75mm) 6-lead DFN (2mm × 2mm) package. 1.2V Output Voltage from 1.5V Input Supply n Wide Input Voltage Range: 0.9V to 5.5V n Stable with Ceramic Capacitors n Very Low Dropout: 85mV at 500mA n Adjustable Output Range: 0.4V to 3.6V (LTC3025-1) n Fixed Output: 1.2V(LTC3025-2), 1.5V(LTC3025-3), 1.8V(LTC3025-4) n ±2% Voltage Accuracy over Temperature, Supply and Load n Low Noise: 80μVRMS (10Hz to 100kHz) n BIAS Voltage Range: 2.5V to 5.5V n Fast Transient Recovery n Shutdown Disconnects Load from VIN and VBIAS n Low Operating Current: IIN = 4μA, IBIAS = 50μA Typ n Low Shutdown Current: IIN = 1μA, IBIAS = 0.01μA Typ n Output Current Limit n Thermal Overload Protection n Available in 6-Lead (2mm × 2mm) DFN Package n Low Power Handheld Devices n Low Voltage Logic Supplies n DSP Power Supplies n Cellular Phones n Portable Electronic Equipment n Handheld Medical Instruments n Post Regulator for Switching Supply Noise Rejection 1MHz VIN Supply Rejection LTC3025-2 BIAS 0.1μF 1.5V 1μF 0.1μF Li-Ion OR 3-CELL NiMH IN SHDN OUT VOUT = 1.2V IOUT ≤ 500mA 30251234 TA01 SENSE GND OFF ON 1.5V HIGH EFFICIENCY DC/DC BUCK VIN (V) 1.2 0 5 15 20 25 50 35 1.6 2.0 2.2 30251234 TA01b 10 40 45 30 1.4 1.8 2.4 2.6 BIAS = 3.6V VOUT = 1.2V IOUT = 100mA IOUT = 300mA COUT = 1μF COUT = 10μF L, LT, LTC and LTM 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 7224204, 7218082. |
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