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The TPS5430DDAR is a non-synchronous step-down DC-DC converter manufactured by Texas Instruments. It integrates a low-resistance high-side N-channel MOSFET and operates from a 5.5V to 36V input supply, delivering up to 3A of continuous output current. The adjustable output voltage ranges from 1.221V to 32.04V, configured by an external resistor divider. A fixed 500kHz switching frequency permits the use of compact inductors and capacitors, reducing the overall PCB footprint and enabling higher power density designs. The device includes an internally compensated feedback loop, which eliminates external compensation networks and shortens the design cycle. Additional integrated functions include undervoltage lockout to prevent startup below 5.5V, an internally configured soft-start circuit to limit inrush current, voltage feedforward for improved transient response, and an enable pin for power sequencing. The shutdown supply current is typically 18μA. The TPS5430DDAR is supplied in a thermally enhanced 8-pin SOIC PowerPAD package that provides a direct thermal path to the PCB ground plane.
Product Category | DC-DC Power Management IC |
|---|---|
Function Type | Step-down (Buck) Converter |
Input Operating Voltage | 5.5V - 36V |
Adjustable Output Voltage | 1.221V - 32.04V |
Continuous Output Current | 3A |
Switching Frequency | 500kHz |
Junction Operating | -40°C - +125°C (TJ) |
Synchronous Rectification | No |
Number of Output Channels | 1 Channel |
Topology | Buck Step-down Topology |
Quiescent Current (Iq) | 4.4mA |
Power MOSFET | Internal Built-in MOSFET |
Output Mode | Adjustable Output |
Functional Features | Cycle-by-cycle current limit, over-current protection, hiccup mode current limiting |
The 5.5V to 36V input range covers standard 12V and 24V distributed power buses used in industrial automation, communication cabinets, and consumer electronics. The undervoltage lockout circuit holds the device off until the input supply reaches 5.5V, preventing undefined operation during supply ramp-up and brownout conditions.
The built-in N-channel power MOSFET eliminates the need for an external switching transistor, reducing BOM component count and simplifying PCB layout for volume production. The internally compensated feedback loop further removes the need for external RC compensation networks, allowing design engineers to allocate board area to other functions.
The TPS5430DDAR implements cycle-by-cycle current limiting, overcurrent protection, and hiccup-mode short-circuit protection. Under a sustained overload or output short circuit, the device enters intermittent hiccup operation to limit power dissipation in both the IC and the downstream load. Thermal shutdown provides an additional layer of protection against excessive junction temperature.
The junction temperature range of -40°C to +125°C supports deployment in industrial and enclosed equipment environments. The PowerPAD package connects the die substrate to an exposed pad, which is soldered to the PCB ground plane to conduct heat away from the device during continuous high-current operation.
The converter supplies regulated low-voltage rails for main control boards in set-top boxes, LCD monitors, and audio systems. The 500kHz switching frequency and integrated voltage feedforward circuit support the load transient response required by digital signal processors and audio amplifier stages.
In 12V and 24V bus systems used in automation equipment and communication infrastructure, the TPS5430DDAR functions as a point-of-load regulator for logic circuits, sensor interfaces, and auxiliary subsystems. The 3A output capacity supports multiple downstream loads from a single conversion stage.
The adjustable output and current limiting features make the device suitable for intermediate bus regulation in lithium-ion battery chargers and high-brightness LED driver circuits. The integrated soft-start limits inrush current during startup, reducing electrical stress on input capacitors and downstream components.
The TPS5430DDAR operates from a 5.5V to 36V input supply, compatible with 12V and 24V distributed power systems. The adjustable output ranges from 1.221V to 32.04V via an external resistor divider.
Yes. The device integrates cycle-by-cycle current limiting and hiccup-mode short-circuit protection. Under an output short or sustained overload, it enters intermittent operation to limit thermal stress on the IC and the connected load.
The TPS5430DDAR uses a fixed 500kHz switching frequency, which allows the use of smaller inductors and output capacitors compared with lower-frequency converter designs.
The TPS5430DDAR is specified for commercial and industrial temperature ranges and is not AEC-Q100 qualified. Designers requiring automotive-grade components should consult the Texas Instruments AEC-Q100 product catalog for suitable alternatives.
