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LMR23630AFDDA Datasheet(PDF) 4 Page - Texas Instruments |
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LMR23630AFDDA Datasheet(HTML) 4 Page - Texas Instruments |
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4 / 42 page  4 LMR23630 SNVSAH2C – DECEMBER 2015 – REVISED JUNE 2017 www.ti.com Product Folder Links: LMR23630 Submit Documentation Feedback Copyright © 2015–2017, Texas Instruments Incorporated (1) A = Analog, P = Power, G = Ground. Pin Functions PIN I/O (1) DESCRIPTION HSO IC WSON With RT WSON With PGOOD NAME 1 1, 2 1, 2 SW P Switching output of the regulator. Internally connected to both power MOSFETs. Connect to power inductor. 2 3 3 BOOT P Boot-strap capacitor connection for high-side driver. Connect a high quality 470-nF capacitor from BOOT to SW. 3 4 4 VCC P Internal bias supply output for bypassing. Connect bypass capacitor from this pin to AGND. Do not connect external loading to this pin. Never short this pin to ground during operation. 4 5 5 FB A Feedback input to regulator, connect the midpoint of feedback resistor divider to this pin. N/A 6 N/A RT A Connect a resistor RT from this pin to AGND to program switching frequency. Leave floating for 400-kHz default switching frequency. N/A N/A 6 PGOOD A Open drain output for power-good flag. Use a 10-kΩ to 100-kΩ pullup resistor to logic rail or other DC voltage no higher than 12 V. 5 8 8 EN/SYNC A Enable input to regulator. High = On, Low = Off. Can be connected to VIN. Do not float. Adjust the input undervoltage lockout with two resistors. The internal oscillator can be synchronized to an external clock by coupling a positive pulse into this pin through a small coupling capacitor. See Enable/Sync for details. 6 7 7 AGND G Analog ground pin. Ground reference for internal references and logic. Connect to system ground. 7 9, 10 9, 10 VIN P Input supply voltage. 8 12 12 PGND G Power ground pin, connected internally to the low side power FET. Connect to system ground, PAD, AGND, ground pins of CIN and COUT. Path to CIN must be as short as possible. 9 13 13 PAD G Low impedance connection to AGND. Connect to PGND on PCB. Major heat dissipation path of the die. Must be used for heat sinking to ground plane on PCB. N/A 11 11 NC N/A Not for use. Leave this pin floating. |
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