Refer to the PDF data sheet for device specific package drawings
The TPS5433xA family of devices are synchronous converters with an input-voltage range of 4.5 V to 28 V. These devices include This device has an integrated low-side switching FET that eliminates the need for an external diode which reduces component count.
Efficiency is maximized through the integrated 128-mΩ and 84-mΩ MOSFETs, low IQ and pulse skipping at light loads. Using the enable pin, the shutdown supply current is reduced to 2 μA. This step-down (buck) converter provides accurate regulation for a variety of loads with a well-regulated voltage reference that is 1.5% over temperature.
Cycle-by-cycle current limiting on the high-side MOSFET protects the TPS5433xA family of devices in overload situations and is enhanced by a low-side sourcing current limit which prevents current runaway. A low-side sinking current-limit turns off the low-side MOSFET to prevent excessive reverse current. Hiccup protection is triggered if the overcurrent condition continues for longer than the preset time. Thermal shutdown disables the device when the die temperature exceeds the threshold and enables the device again after the built-in thermal hiccup time.
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
TPS54335A TPS54336A |
SO PowerPAD (8) | 4.89 mm × 3.90 mm |
VSON (10) | 3.00 mm × 3.00 mm | |
TPS54335-1A | VSON (10)(2) | 3.00 mm × 3.00 mm |
Changes from C Revision (March 2015) to D Revision
Changes from B Revision (August 2015) to C Revision
Changes from A Revision (December 2014) to B Revision
Changes from * Revision (November 2014) to A Revision
PIN | I/O | DESCRIPTION | ||
---|---|---|---|---|
NAME | SO PowerPAD | VSON | ||
BOOT | 1 | 9 | O | A bootstrap capacitor is required between the BOOT and PH pins. If the voltage on this capacitor is below the minimum required by the output device, the output is forced to switch off until the capacitor is refreshed. |
COMP | 6 | 7 | O | This pin is the error-amplifier output and the input to the output switch-current comparator. Connect frequency compensation components to this pin. |
EN | 7 | 8 | I | This pin is the enable pin. Float the EN pin to enable. |
GND | 4 | 3 | — | Ground |
GND | 4 | 4 | — | Ground |
GND | 4 | 5 | — | Ground |
PH | 3 | 2 | O | The PH pin is the source of the internal high-side power MOSFET. |
RT (TPS54335A and TPS54335-1A) | 8 | 10 | O | Connect the RT pin to an external timing resistor to adjust the switching frequency of the device. |
SS (TPS54336A) | 8 | 10 | O | The SS pin is the soft-start and tracking pin. An external capacitor connected to this pin sets the internal voltage-reference rise time. The voltage on this pin overrides the internal reference. |
VIN | 2 | 1 | — | This pin is the 4.5- to 28-V input supply voltage. |
VSENSE | 5 | 6 | I | This pin is the inverting node of the transconductance (gm) error amplifier. |
PowerPAD (SO only) | — | For proper operation, connect the GND pin to the exposed thermal pad. This thermal pad should be connected to any internal PCB ground plane using multiple vias for good thermal performance. | ||
Thermal pad (VSON only) | — |