Pin compatible with TPS54620
The TPS54622-EP device in thermally enhanced 3.5-mm × 3.5-mm VQFN package is a full-featured 17-V, 6-A synchronous step-down converter optimized for small designs through high efficiency and integrating the high-side and low-side MOSFETs. Further space savings are achieved through current mode control, which reduces component count, and by selecting a high switching frequency, reducing the footprint of the inductor.
The output voltage start-up ramp is controlled by the SS/TR pin, which allows operation as either a stand-alone power supply or in tracking situations. Power sequencing is also possible by correctly configuring the enable and the open-drain power good pins.
Cycle-by-cycle current limiting on the high-side FET protects the device in overload situations and is enhanced by a low-side sourcing current limit that prevents current runaway. There is also a low-side sinking current limit that turns off the low-side MOSFET to prevent excessive reverse current. Hiccup protection is triggered if the overcurrent condition has persisted for longer than the preset time. Thermal hiccup protection disables the device when the die temperature exceeds the thermal shutdown temperature and enables the part again after the built-in thermal shutdown hiccup time.
PART NUMBER | PACKAGE(1) | BODY SIZE (NOM) |
---|---|---|
TPS54622-EP | VQFN (14) | 3.50 mm × 3.50 mm |
DATE | REVISION | NOTES |
---|---|---|
December 2020 | * | Initial release. |
PIN | I/O(1) | DESCRIPTION | |
---|---|---|---|
NAME | NO. | ||
BOOT | 13 | I | A bootstrap cap is required between BOOT and PH. The voltage on this cap carries the gate drive voltage for the high-side MOSFET. |
COMP | 8 | O | Error amplifier output, and input to the output switch current comparator. Connect frequency compensation to this pin. |
EN | 10 | I | Enable pin. Float to enable. Adjust the input undervoltage lockout with two resistors. |
GND | 2, 3 | G | Return for control circuitry and low-side power MOSFET. |
PH | 11, 12 | O | The switch node. |
PVIN | 4, 5 | P | Power input. Supplies the power switches of the power converter. |
PWRGD | 14 | G | Power Good fault pin. Asserts low if output voltage is low due to thermal shutdown, dropout, over-voltage, EN shutdown or during slow start. |
RT/CLK | 1 | I | Automatically selects between RT mode and CLK mode. An external timing resistor adjusts the switching frequency of the device; In CLK mode, the device synchronizes to an external clock. |
SS/TR | 9 | O | Slow start and tracking. An external capacitor connected to this pin sets the internal voltage reference rise time. The voltage on this pin overrides the internal reference. It can be used for tracking and sequencing. |
VIN | 6 | P | Supplies the control circuitry of the power converter. |
VSENSE | 7 | I | Inverting input of the gm error amplifier. |
Exposed Thermal PAD | 15 | G | Thermal pad of the package and signal ground and it must be soldered down for proper operation. |