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LTC3125 Datasheet(PDF) 6 Page - Linear Technology |
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LTC3125 Datasheet(HTML) 6 Page - Linear Technology |
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6 / 18 page  LTC3125 6 3125fa PIN FUNCTIONS GND (Pin 1, Exposed Pad Pin 9): Ground. The exposed pad must be soldered to the PCB ground plane for electrical connection and for rated thermal performance. FB (Pin 2): Feedback Input to the Error Amplifier. Connect the resistor divider tap to this pin. The top of the divider connects to VOUT and the bottom of the divider connects to GND. The output voltage can be adjusted from 1.8V to 5.25V. PROG (Pin 3): Programming Input for Average Input Cur- rent. This pin should be connected to ground through an external resistor (RPROG) to set input average current limit threshold. Refer to the Component Selection section in Applications Information for details on selecting RPROG. VIN (Pin 4): Input Voltage. The device is powered from VIN until VOUT exceeds VIN. Once VOUT is greater than (VIN + 0.25V), the device is powered from VOUT. Place a ceramic bypass capacitor from VIN to GND. A minimum value of 1μF is recommended. Also connects to CS through 60mΩ internal sense resistor. CS (Pin 5): Current Sense Resistor Connection Point. Connect the inductor directly to CS. An internal 60mΩ sense resistor is connected between CS and VIN. SHDN (Pin 6): Logic Controlled Shutdown Input. Bringing this pin above 1V enables the part, forcing this pin below 0.35V disables the part. VOUT (Pin 7): Output Voltage Sense and the Output of the Synchronous Rectifier. Connect the output filter capacitor from VOUT to GND, close to the IC. A minimum value of 150μF is recommended. Due to the output disconnect feature, VOUT is disconnected from VIN when SHDN is low. SW (Pin 8): Switch Pin. Connect an inductor from this pin to CS. An internal anti-ringing resistor is connected across SW and CS after the inductor current has dropped near zero. TYPICAL PERFORMANCE CHARACTERISTICS (T A = 25°C unless otherwise noted) VOUT and IIN During Soft-Start VOUT 2V/DIV SHDN 5V/DIV INPUT CURRENT 200mA/DIV 2s/DIV VIN = 3.3V VOUT = 4.5V COUT = 1F L = 2.7μH 3125 G20 Efficiency vs VIN VIN (V) 2 50 60 65 70 75 80 85 3 4 3125 G21 90 95 100 55 5 ILOAD = 200mA VOUT = 3.8V |
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