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LMR14020QDPRRQ1 Datasheet(PDF) 3 Page - Texas Instruments |
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LMR14020QDPRRQ1 Datasheet(HTML) 3 Page - Texas Instruments |
3 / 35 page FB SS GND SW BOOT VIN EN RT/SYNC 2 3 4 5 1 9 8 7 6 10 VIN PGOOD Thermal Pad (11) FB SS GND SW BOOT VIN EN RT/SYNC Thermal Pad (9) 1 2 3 4 5 6 7 8 3 LMR14020-Q1 www.ti.com SNVSAG4A – NOVEMBER 2015 – REVISED JULY 2016 Product Folder Links: LMR14020-Q1 Submit Documentation Feedback Copyright © 2015–2016, Texas Instruments Incorporated (1) A = Analog, P = Power, G = Ground 5 Pin Configuration and Functions DDA Package 8-Pin (HSOIC) Top View DPR Package 10-Pin (WSON) Top View Pin Functions NAME NO. TYPE (1) DESCRIPTION SO-8 WSON-10 BOOT 1 1 P Bootstrap capacitor connection for high-side MOSFET driver. Connect a high quality 0.1 μF capacitor from BOOT to SW. VIN 2 2, 3 P Connect to power supply and bypass capacitors CIN. Path from VIN pin to high frequency bypass CIN and GND must be as short as possible. EN 3 4 A Enable pin, with internal pull-up current source. Pull below 1.2 V to disable. Float or connect to VIN to enable. Adjust the input under voltage lockout with two resistors. See the Enable and Adjusting Under voltage lockout section. RT/SYNC 4 5 A Resistor Timing or External Clock input. An internal amplifier holds this pin at a fixed voltage when using an external resistor to ground to set the switching frequency. If the pin is pulled above the PLL upper threshold, a mode change occurs and the pin becomes a synchronization input. The internal amplifier is disabled and the pin is a high impedance clock input to the internal PLL. If clocking edges stop, the internal amplifier is re-enabled and the operating mode returns to frequency programming by resistor. FB 5 7 A Feedback input pin, connect to the feedback divider to set VOUT. Do not short this pin to ground during operation. SS 6 6 A Soft-start control pin. Connect to a capacitor to set soft-start time. PGOOD N/A 8 A Open drain output for power-good flag. Use a 10 kΩ to 100 kΩ pull-up resistor to logic rail or other DC voltage no higher than 7V. GND 7 9 G System ground pin. SW 8 10 P Switching output of the regulator. Internally connected to high-side power MOSFET. Connect to power inductor. Thermal Pad 9 11 G Major heat dissipation path of the die. Must be connected to ground plane on PCB. |
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