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LT3626 Datasheet(PDF) 9 Page - Linear Technology |
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LT3626 Datasheet(HTML) 9 Page - Linear Technology |
9 / 28 page LTC3633A/LTC3633A-1 9 3633a1f (QFN/TSSOP) PIN FUNCTIONS V2P5 (Pin 18/Pin 21): 2.5V Regulator Output. Outputs a regulated 2.5V supply voltage capable of supplying 10mA. Bypass this pin with a minimum of 1μF low ESR ceramic capacitor. Tie this pin to INTVCC when this output is not being used in the application. INTVCC (Pin 19/Pin 22): Internal 3.3V Regulator Output. The internal power drivers and control circuits are powered from this voltage. The internal regulator is disabled when both channel 1 and channel 2 are disabled with the RUN1/ RUN2 inputs. Decouple this pin to power ground with a minimum of 1μF low ESR ceramic capacitor. BOOST1 (Pin 20/Pin 23): Boosted Floating Driver Supply for Channel 1. The (+) terminal of the bootstrap capacitor connects to this pin while the (–) terminal connects to the SW pin. The normal operation voltage swing of this pin ranges from a diode voltage drop below INTVCC up to VIN + INTVCC. VIN1 (Pins 21,22/Pins 24, 25): Power Supply Input for Channel 1. Input voltage to the on chip power MOSFETs on channel 1. The internal LDO for INTVCC is powered off of this pin. SW1 (Pins 23,24/Pins 26, 27): Channel 1 Switch Node Connection to External Inductor. Voltage swing of SW is from a diode voltage drop below ground to VIN. VON1 (Pin 25/Pin 28): On-Time Voltage Input for Chan- nel 1. This pin sets the voltage trip point for the on-time comparator. Tying this pin to the regulated output voltage makes the on-time proportional to VOUT1 when VOUT1 is within the VON1 sense range (0.6V – 6V for LTC3633A, 1.5V – 12V for LTC3633A-1). When VOUT is outside the VON sense range, the switching frequency may deviate from the programmed frequency. The pin impedance is nominally 140kΩ. ITH1 (Pin 26/Pin 1): Channel 1 Error Amplifier Output and Switching Regulator Compensation Pin. Connect this pin to appropriate external components to compensate the regulator loop frequency response. Connect this pin to INTVCC to use the default internal compensation. TRACKSS1 (Pin 27/Pin 2): Output Tracking and Soft-Start Input Pin for Channel 1. Forcing a voltage below 0.6V on this pin bypasses the internal reference input to the error amplifier. The LTC3633A will servo the FB pin to the TRACK voltage. Above 0.6V, the tracking function stops and the internal reference resumes control of the error amplifier. An internal 1.4μA pull up current from INTVCC allows a soft-start function to be implemented by connecting a capacitor between this pin and SGND. VFB1 (Pin 28/Pin 3): Channel 1 Output Feedback Voltage Pin. Input to the error amplifier that compares the feedback voltage to the internal 0.6V reference voltage. Connect this pin to a resistor divider network to program the desired output voltage. PGND (Exposed Pad Pin 29/Exposed Pad Pin 29): Power Ground Pin. The (–) terminal of the input bypass capaci- tor, CIN, and the (–) terminal of the output capacitor, COUT, should be tied to this pin with a low impedance connec- tion. This pin must be soldered to the PCB to provide low impedance electrical contact to power ground and good thermal contact to the PCB. |
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