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ADP3170JRU Datasheet(PDF) 4 Page - Analog Devices |
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ADP3170JRU Datasheet(HTML) 4 Page - Analog Devices |
4 / 16 page REV. 0 ADP3170 –4– PIN FUNCTION DESCRIPTIONS Pin No. Mnemonic Function 1–5 VID3, VID2, Voltage Identification DAC Inputs. These pins are pulled up to an internal reference, VID1, VID0, providing a logic one if left open. The DAC output programs the FB regulation voltage from VID25 1.05 V to 1.825 V. 6 PWRGD Open drain output that signals when the output voltage is in the proper operating range. 7 REF 3.0 V Reference Output. 8 SD Regulator Shutdown. Pulling this pin high turns off both MOSFETs of the switching regulator. SD has no effect on the linear regulator controller. 9 FB Feedback Input. Error amplifier input for remote sensing of the output voltage. 10 CS– Current Sense Negative Node. Negative input for the current comparator. 11 CS+ Current Sense Positive Node. Positive input for the current comparator. The output current is sensed as a voltage at this pin with respect to CS–. 12 CT External capacitor connected from CT to ground sets the OFF-Time of the device. 13 COMP Error Amplifier Output and Compensation Point. The voltage at this output programs the output current control level between CS+ and CS–. 14 LRDRV Gate Drive for the 1.8 V linear regulator N-channel MOSFET. 15 LRFB Feedback Connections for the 1.8 V linear regulator controller. 16 VCC Supply Voltage for the ADP3170. 17 DRVL Low-Side MOSFET Drive. Gate drive for the synchronous rectifier N-channel MOSFET. The voltage at DRVL swings from GND to VCC. 18 DRVH High-Side MOSFET Drive. Gate drive for the buck switch N-channel MOSFET. The voltage at DRVH swings from GND to VCC. 19 PGND Power Ground. PGND should have a low impedance path to the source of the synchronous MOSFET. 20 GND Small-Signal Ground. This ground reference can be used in conjunction with FB to provide remote sensing of the output voltage at the CPU pins. PIN CONFIGURATION RU-20 TOP VIEW (Not to Scale) 20 19 18 17 16 15 14 13 12 11 1 2 3 4 5 6 7 8 9 10 ADP3170 FB SD REF PWRGD CT COMP PGND DRVH DRVL LRDRV LRFB VCC VID3 GND VID2 VID1 VID0 VID25 CS+ CS– |
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