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LTC1436AIGN-PLL Datasheet(PDF) 7 Page - Linear Technology |
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LTC1436AIGN-PLL Datasheet(HTML) 7 Page - Linear Technology |
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7 / 28 page  7 LTC1436A LTC1436A-PLL/LTC1437A TYPICAL PERFORMANCE CHARACTERISTICS Auxiliary Regulator Sink Current Available AUX DR VOLTAGE (V) 0 0 5 10 15 20 24 6 8 1436 G19 10 12 14 16 Auxiliary Regulator PSRR FREQUENCY (kHz) 10 10 20 30 40 50 60 70 100 1000 1436 G20 10mA LOAD 100mA LOAD PIN FUNCTIONS VIN: Main Supply Pin. Must be closely decoupled to the IC’s signal ground pin. INTVCC: Output of the Internal 5V Regulator and EXTVCC Switch. The driver and control circuits are powered from this voltage. Must be closely decoupled to power ground with a minimum of 2.2 µFtantalumorelectrolyticcapacitor. DRVCC: Bottom MOSFET Driver Supply Voltage. EXTVCC: Input to the Internal Switch Connected to INTVCC. This switch closes and supplies VCC power whenever EXTVCC is higher than 4.7V. See EXTVCC connection in Applications Information section. Do not exceed 10V on this pin. Connect to VOUT if VOUT ≥ 5V. BOOST: Supply to Topside Floating Driver. The bootstrap capacitor is returned to this pin. Voltage swing at this pin is from INTVCC to VIN + INTVCC. SW: Switch Node Connection to Inductor. Voltage swing at this pin is from a Schottky diode (external) voltage drop below ground to VIN. SGND: Small Signal Ground. Must be routed separately from other grounds to the (–) terminal of COUT. PGND: Driver Power Ground. Connects to source of bottom N-channel MOSFET and the (–) terminal of CIN. SENSE –: The (–) Input to the Current Comparator. SENSE +: The (+) Input to the Current Comparator. Built- in offsets between SENSE– and SENSE+ pins in conjunction with RSENSE set the current trip thresholds. VOSENSE: Receives the remotely sensed feedback voltage either from the output or from an external resistive divider across the output . The VPROG pin determines which point VOSENSE must connect to. VPROG: This voltage selects the output voltage. For VPROG < VINTVCC/3 the output is set to 3.3V with VOSENSE connected to the output. With VPROG > VINTVCC/1.5 the output is set to 5V with VOSENSE connected to the output. Leaving VPROG open (DC) allows the output voltage to be set by an external resistive divider connected to VOSENSE. COSC: External capacitor COSC from this pin to ground sets the operating frequency. ITH: Error Amplifier Compensation Point. The current comparator threshold increases with this control voltage. Nominal voltage range for this pin is 0V to 2.5V. RUN/SS: Combination of Soft Start and Run Control Inputs. A capacitor to ground at this pin sets the ramp time to full current output. The time is approximately 0.5s/ µF. |
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Similar Description - LTC1436AIGN-PLL |
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