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LTC3200-5 Datasheet(PDF) 6 Page - Linear Technology |
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LTC3200-5 Datasheet(HTML) 6 Page - Linear Technology |
6 / 16 page LTC3245 6 3245f For more information www.linear.com/LTC3245 pin FuncTions VIN (Pins 1, 2, 3): Power Input Pins. Input voltage for both charge pump and IC control circuitry. The VIN pin oper- ates from 2.7V to 38V. All VIN pins should be connected together at pins. BURST (Pin 4): Burst Mode Logic Input. A logic high on the BURST pin operates the charge pump in low noise constant frequency. A logic low will operates the charge pump in Burst Mode operation for higher efficiency at low output currents. The BURST pin has a 1μA (typical) pull-down current to ground and can tolerate 38V inputs allowing it to be pin-strapped to VIN. SEL1 (Pin 5): Logic Input Pin. See Table 1 for SEL1/SEL2 operatinglogic.TheSEL1pinhasa1μA(typical)pull-down current to ground and can tolerate 38V inputs allowing it to be pin-strapped to VIN. SEL2 (Pin 6): Logic Input Pin. See Table 1 for SEL1/SEL2 operatinglogic.TheSEL2pinhasa1μA(typical)pull-down current to ground and can tolerate 38V inputs allowing it to be pin-strapped to VIN. Table 1: VOUT Operating Modes SEL2 SEL1 MODE LOW LOW Shutdown LOW HIGH Adjustable VOUT HIGH LOW Fixed 5V HIGH HIGH Fixed 3.3V OUTS/ADJ (Pin 7): VOUT Sense / Adjust Input Pin. This pin acts as VOUT sense (OUTS) for 5V or 3.3V fixed outputs and adjust (ADJ) for adjustable output through external feedback. The ADJ pin servos to 1.2V when the device is enabled in adjustable mode. (OUTS / ADJ are selected by SEL1 and SEL2 pins; See Table 1) PGOOD (Pin 8): Power Good Open Drain Logic Output. The PGOOD pin goes high impedance when VOUT is about 6% of its final operating voltage. PGOOD is intended to be pulled up to VOUT or other low voltage supply with an external resistor. C+ (Pin 9): Flying Capacitor Positive Connection. VOUT (Pin 10): Charge Pump Output Voltage. If VIN drops below its UVLO threshold, the connection from VIN be- comes high impedance with no reverse leakage from VOUT to VIN. VOUT regulation only takes place above the UVLO threshold. VOUT can be programmed to regulate from 2.5V to 5V. C– (Pin 11): Flying Capacitor Negative Connection. GND (Pin 12, Exposed Pad Pin 13): Ground. The exposed package pad is ground and must be soldered to the PC board ground plane for proper functionality and for rated thermal performance. Typical perForMance characTerisTics T A = 25°C, unless otherwise noted. 5V Output Transient Response 3.3V Output Transient Response 200mA IOUT 5mA LOW NOISE AC 50mV/DIV Burst Mode OPERATION AC 50mV/DIV VIN = 12V VOUT = 5V 3245 G19 150mA IOUT 5mA LOW NOISE AC 50mV/DIV Burst Mode OPERATION AC 50mV/DIV VIN = 12V VOUT = 3.3V 3245 G20 |
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Similar Description - LTC3200-5 |
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