SLVSBO1G July 2013 – June 2021 TPS54561
PRODUCTION DATA
PIN | I/O | DESCRIPTION | ||
---|---|---|---|---|
NAME | NO. | |||
BOOT | 1 | O | A bootstrap capacitor is required between BOOT and SW. If the voltage on this capacitor is below the minimum required to operate the high-side MOSFET, the gate drive is switched off until the capacitor is refreshed. | |
VIN | 2 | I | Input supply voltage with 4.5-V to 60-V operating range. | |
EN | 3 | I | Enable pin, with internal pull-up current source. Pull below 1.2 V to disable. Float to enable. Adjust the input undervoltage lockout with two resistors. See Section 7.3.7. | |
SS/TR | 4 | I | Soft-start and Tracking. An external capacitor connected to this pin sets the output rise time. Since the voltage on this pin overrides the internal reference, it can be used for tracking and sequencing. | |
RT/CLK | 5 | I | Resistor Timing and External Clock. 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 resistor frequency programming. | |
FB | 6 | I | Inverting input of the transconductance (gm) error amplifier. | |
COMP | 7 | O | Error amplifier output and input to the output switch current (PWM) comparator. Connect frequency compensation components to this pin. | |
GND | 8 | – | Ground | |
SW | 9 | I | The source of the internal high-side power MOSFET and switching node of the converter. | |
PWRGD | 10 | O | Power Good is an open drain output that asserts low if the output voltage is out of regulation due to thermal shutdown, dropout, over-voltage or EN shut down | |
Thermal Pad | 11 | – | GND pin must be electrically connected to the exposed pad on the printed circuit board for proper operation. |