SNVSAA6A February 2015 – March 2015 LMR14050
PRODUCTION DATA.
PIN | TYPE (1) | DESCRIPTION | |
---|---|---|---|
NAME | NO. | ||
BOOT | 1 | O | Bootstrap capacitor connection for high-side MOSFET driver. Connect a high quality 0.1 μF capacitor from BOOT to SW. |
VIN | 2 | I | 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 | I | 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 | I | 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 | I | Feedback input pin, connect to the feedback divider to set VOUT. Do not short this pin to ground during operation. |
SS | 6 | O | Soft-start control pin. Connect to a capacitor to set soft-start time. |
GND | 7 | G | System ground pin. |
SW | 8 | O | Switching output of the regulator. Internally connected to high-side power MOSFET. Connect to power inductor. |
Thermal Pad | 9 | G | Major heat dissipation path of the die. Must be connected to ground plane on PCB. |