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LTC3442 Datasheet(PDF) 6 Page - Linear Technology |
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LTC3442 Datasheet(HTML) 6 Page - Linear Technology |
6 / 20 page LTC3442 6 3442fb For more information www.linear.com/LTC3442 PIN FUNCTIONS TYPICAL PERFORMANCE CHARACTERISTICS (T A = 25°C unless otherwise specified). Transition from Burst Mode Operation to Fixed Frequency Mode Pulsed Overload Using Average Input Current Limit 200µs/DIV 3442 G22 COUT = 100µF LOW ESR TANTALUM INDUCTOR CURRENT 0.5A/DIV VOUT 50mV/DIV 1ms/DIV 3442 G23 RLIM = 133k CLIM = .001µF INDUCTOR CURRENT 0.5A/DIV RLIM PIN 0.5V/DIV VOUT 2V/DIV SHDN/SS (Pin 1): Combined Soft-Start and Shutdown. Applied voltage <0.4V shuts down the IC. Tie to >1.4V to enable the IC and >2.4V to ensure the error amp is not clamped from soft-start. For Burst Mode operation, this pin must be pulled up to within 0.5V of VIN. An RC network fromtheshutdowncommandsignaltothispinwillprovide a soft-start function by limiting the rise time of the VC pin. RT (Pin 2): Programs the Frequency of the Internal Os- cillator. Place a resistor from this pin to ground. See the Applications Information section for component value selection. SGND (Pin 3): Signal Ground for the IC. SW1 (Pin 4): Switch Pin Where Internal Switches A and B Are Connected. Connect inductor from SW1 to SW2. An optional Schottky diode can be connected from SW1 to ground for a moderate efficiency improvement. Minimize trace length to reduce EMI. PGND (Pin 5, 13): Power Ground for the Internal NMOS Power Switches. The exposed pad must be soldered to PCB ground to provide both electrical contact and a good thermal contact to the PCB. SW2 (Pin 6): Switch Pin Where Internal Switches C and D Are Connected. An optional Schottky diode can be connected from SW2 to VOUT for a moderate efficiency improvement. Minimize trace length to reduce EMI. BURST (Pin 7): Used to Set the Automatic Burst Mode Op- erationThreshold.Placearesistorandcapacitorinparallel from this pin to ground. See the Applications Information sectionforcomponentvalueselection.Formanualcontrol, ground the pin to force Burst Mode operation, connect to VOUT to force fixed frequency mode. VOUT (Pin 8): Output of the Synchronous Rectifier. A filter capacitor is placed from VOUT to GND. A ceramic bypass capacitor is recommended as close to the VOUT and GND pins as possible. VIN (Pin 9): Input Supply Pin. Internal VCC for the IC. A 10µF ceramic capacitor is recommended as close to VIN and SGND as possible. RLIM (Pin 10): Sets the Average Input Current Limit Threshold. Place a resistor and capacitor in parallel from this pin to ground. See the Applications Information sec- tion for component value selection. VC(Pin11):ErrorAmpOutput.Afrequencycompensation network is connected from this pin to FB to compensate the loop. During Burst Mode operation, VC is internally connected to a hold circuit. FB (Pin 12): Feedback Pin. Connect resistor divider tap here. The output voltage can be adjusted from 2.4V to 5.25V. The feedback reference voltage is typically 1.22V. |
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Similar Description - LTC3442_15 |
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