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RT7276 Datasheet(PDF) 9 Page - Richtek Technology Corporation |
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RT7276 Datasheet(HTML) 9 Page - Richtek Technology Corporation |
9 / 24 page RT7275/76 9 DS7275/76-00 January 2013 www.richtek.com © Copyright 2013 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. Pin No. TSSOP-14 (Exposed Pad) WDFN-10L 3x3 Pin Name Pin Function 1 -- VOUT Optional Output Voltage Discharge Connection. This open drain output connects to ground when the device is disabled. If output voltage discharge is desired, connect VOUT to the output voltage. 2 2 FB Feedback Input Voltage. Connect FB to the midpoint of the external feedback resistive divider to sense the output voltage. Place the resistive divider within 5mm from the FB pin. The IC regulates VFB at 0.765V (typical). 3 3 PVCC Linear Regulator Output. PVCC is the output of the internal 5.1V linear regulator powered by VIN (WDFN-10L 3x3) or VINR (TSSOP-14 (Exposed Pad)). Connect a 1 μF ceramic capacitor from PVCC to ground. 4 4 SS Soft-Start Control. Connect an external capacitor between this pin and ground to set the soft-start time. 5 -- GND Analog Ground. 6 5 PGOOD Open Drain Power-good Output. PGOOD connects to PGND whenever VFB is less than 90% of its regulation threshold (typical). 7 1 EN Enable Control Input. Connect EN to a logic-high voltage to enable the IC or to a logic-low voltage to disable. Do not leave this high impedance input unconnected. 8, 9, 15 (Exposed pad) 11 (Exposed pad) PGND Power Ground. PGND connects to the Source of the internal N-channel MOSFET synchronous rectifier and to other power ground nodes of the IC. The exposed pad and the 2 PGND pins (TSSOP-14 (Exposed Pad)) should be well soldered to the input and output capacitors and to a large PCB area for good power dissipation. 10, 11 6, 7 SW Switching Node. SW is the Source of the internal N-channel MOSFET switch and the Drain of the internal N-channel MOSFET synchronous rectifier. Connect SW to the inductor with a wide short PCB trace and minimize its area to reduce EMI. 12 8 BOOT Bootstrap Supply for High Side Gate Driver. Connect a 0.1 μF capacitor between BOOT and SW to power the internal gate driver. 13 9, 10 VIN Power Input. VIN is the Drain of the internal N-channel MOSFET switch. Connect VIN to the input capacitor. For the WDFN-10L 3x3 package, VIN also supplies power to the internal linear regulator. 14 -- VINR Internal Linear Regulator Supply Input. For the TSSOP-14 (Exposed Pad) package, VINR supplies power for the internal linear regulator that powers the IC. Connect VIN to the input voltage and bypass to ground with a 0.1 μF ceramic capacitor. Functional Pin Description |
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