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LT3689 Datasheet(PDF) 1 Page - Linear Technology |
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LT3689 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 32 page  LT3689/LT3689-5 1 3689fa TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION 700mA Step-Down Regulator with Power-On Reset and Watchdog Timer The LT®3689 is an adjustable frequency (350kHz to 2.2MHz) monolithic step-down switching regulator with a power-on reset and watchdog timer. The regulator operates from inputs up to 36V and withstands transients up to 60V. Low ripple Burst Mode® operation maintains high efficiency at low output current while keeping output ripple below 15mV in a typical application, with input quiescent current of just 85μA. Shutdown circuitry reduces input supply current to less than 1μA while EN/UVLO is pulled low. Using a resis- tor divider on the EN/UVLO pin provides a programmable undervoltage lockout. Current limit, frequency foldback and thermal shutdown provide fault protection. The reset and watchdog timeout periods are indepen- dently adjustable using external capacitors. Tight accuracy specifications and glitch immunity ensure reliable reset operation of a system without false triggering. The open collector RST will pull down if output voltage drops 10% below the programmed value. The watchdog timer is pin-selectable for window or timeout modes. In timeout mode, WDO pulls low if too long of a period passes before a watchdog transition is detected. In window mode, the LT3689 monitors for WDI falling edges grouped too close together or too far apart. L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. 3.3V Regulator with Power-On Reset Timer and Watchdog Timer n Wide Input Range: Operation from 3.6V to 36V Overvoltage Lockout Protects Circuits through 60V Transients n 85μA IQ at 12VIN to 3.3VOUT n Low Ripple Burst Mode® Operation Allows Output Ripple <15mVP-P n Programmable, Defeatable Watchdog Timer with Window or Timeout Control n Programmable Power-On Reset Timer (POR) n Synchronizable, Adjustable 350kHz to 2.2MHz Switching Frequency n 700mA Output Switching Regulator with Internal Power Switch n Fixed 5V or Adjustable Output Voltage n 800mV Feedback Voltage n Programmable Input Undervoltage Lockout with Hysteresis n 16-Pin 3mm × 3mm QFN and 16-Pin MSOP Packages n Automotive Electronic Control Units n Industrial Power Supplies SW I/O I/O RESET DA FB RT SYNC fSW = 700kHz WDI RST WDO VIN μP EN/UVLO VIN 4.5V TO 36V TRANSIENT TO 60V 3.3V 700mA 100k CWDT 10nF tWDU = 182ms tWDL = 5.9ms 12μH 10pF 22μF 0.1μF 316k GND 20.5k LT3689 3689 TA01 BST OUT CPOR CWDT 2.2μF CPOR 68nF tRST = 157ms Efficiency LOAD CURRENT (A) 0.0001 0.01 0.1 1 0.001 3689 TA01b VIN = 12V VOUT = 3.3V f = 700kHz L = 12μH TA = 25°C 40 50 60 70 80 30 20 10 0 90 100 10 1 1000 |
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