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LT3686IDDPBF Datasheet(PDF) 7 Page - Linear Technology |
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LT3686IDDPBF Datasheet(HTML) 7 Page - Linear Technology |
7 / 28 page LT3686 3686fa VIN (Pin 1): The VIN pin supplies current to the LT3686’s internal regulator and to the internal power switch. This pin must be locally bypassed. BD (Pin 2): The BD pin is used to provide current to the internal Boost Schottky diode. Tie this pin to output whenever possible. When the MODE pin is greater than 0.8V, the LT3686 will prevent pulse-skipping at light loads by regulating an active load on the BD pin; see the Applications Information section Fixed Frequency at Light Load. FB (Pin 3): The LT3686 regulates its feedback pin to 0.8V. Connect the feedback resistor divider tap to this pin. Set the output voltage according to VOUT = 0.8(1 + R1/R2). A good value for R2 is 10k. SS (Pin 4): Provides Soft-Start and Tracking. An internal 2µA current source tied to a 2.5V reference supplies cur- rent to this pin to charge an external capacitor to create a voltage ramp at the pin. Feedback voltage and switching frequency both track SS voltage. Feedback voltage stops tracking at 0.8V. SS is reset under all fault conditions. Float the pin if soft-start feature is not being used. RT (Pin 5): The RT pin is used to program the oscillator frequency. Select the value of RT resistor according to Table 1 in the applications section of the data sheet. EN/UVLO (Pin 6): The EN/UVLO pin is used to start up the LT3686.Pullthepinbelow0.4VtoshutdowntheLT3686.The 1.27V threshold can function as an accurate undervoltage lockout (UVLO), preventing the regulator from operating until the input voltage has reached the programmed level. Do not drive the EN/UVLO pin above VIN. MODE (Pin 7): The MODE pin acts as mode select for the BD active load; when it is tied high, the LT3686 will prevent pulse skipping at light loads by regulating an active load on the BD pin. To disable the active load, tie MODE to GND. BOOST (Pin 8): The BOOST pin is used to provide a drive voltage,higherthantheinputvoltage,totheinternalbipolar NPN power switch. DA (Pin 9): Connect catch diode (D1) anode to this pin. SW(Pin10):TheSWpinistheoutputoftheinternalpower switch. Connect this pin to the inductor, catch diode and boost capacitor. GND (Exposed Pad Pin 11): The exposed pad GND pin is the only ground connection for the device. The exposed pad should be soldered to a large copper area to reduce thermal resistance. pin Functions |
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