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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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LTC3246 데이터시트(HTML) 1 Page - Analog Devices |
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LTC3246 데이터시트(HTML) 1 Page - Analog Devices |
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LTC3246 1 3246fa For more information www.linear.com/LTC3246 TYPICAL APPLICATION FEATURES DESCRIPTION Wide VIN Range Buck-Boost Charge Pump with Watchdog Timer The LTC®3246 is a switched capacitor buck-boost DC/DC converter with integrated watchdog timer. The device produces a regulated output (3.3V, 5V or adjustable) from a 2.7V to 38V input. Switched capacitor fractional conver- sion is used to maintain regulation over a wide range of input voltage. Internal circuitry automatically selects the conversionratiotooptimizeefficiencyasinputvoltageand load conditions vary. No inductors are required. The LTC3246’s reset time and watchdog timeout may be set without external components, or adjusted using external capacitors. A windowed watchdog function is used for high reliability applications. The reset input can be used for additional supply monitoring or be configured as a pushbutton reset. Low operating current (20µA without load, 1.5µA in shut- down) and low external parts count make the LTC3246 ideally suited for low power, space constrained automo- tive/industrial applications. The device is short-circuit and overtemperature protected and is available in a thermally enhanced 16-lead MSOP package. Regulated 5V Output with Pushbutton Reset Output Voltage vs Input Voltage n 2.7V – 38V Operating Range (42V Abs Max) n IQ = 20µA Operating, 1.5µA in Shutdown n Multimode Buck-Boost Charge Pump (2:1, 1:1, 1:2) with Automatic Mode Switching n 12V to 5V Efficiency = 81% n IOUT Up to 500mA n VOUT: Fixed 3.3V, 5V or Adjustable (2.5V to 5V) n Ultralow EMI Emissions n Engineered for Diagnostic Coverage in ISO 26262 Systems n Overtemperature, Overvoltage and Short-Circuit Protection n Operating Junction Temperature: 150°C Max n POR/Watchdog Controller w/External Timing Control n Thermally Enhanced 16-Lead MSOP Package APPLICATIONS n Automotive ECU/CAN Transceiver Supplies n Industrial/Telecom Housekeeping Supplies n Low Power 12V to 5V Conversion All registered trademarks and trademarks are the property of their respective owners. LTC3246 3246 TA01a VIN SEL2 SEL1 BIAS RT WT C+ C– GND VOUT OUTS/ADJ RST WDI RSTI 1µF 10µF 10µF 500k 500k µC RESET 2.2µF VIN = 2.7V TO 38V VOUT = 5V IOUT UP TO 500mA 0 2 4 6 8 10 12 14 16 4.80 4.85 4.90 4.95 5.00 5.05 5.10 5.15 5.20 3246 TA01b VIN (V) IOUT = 50mA IOUT = 500mA |
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