Texas Instruments TPS54336DDA

Overview

TPS54336DDA from Texas Instruments is a synchronous step-down DC-DC converter with integrated 128-mΩ high-side and 84-mΩ low-side MOSFETs, delivering up to 3-A continuous output current from a 4.5-V to 28-V input. It features fixed 340-kHz switching frequency, adjustable soft-start via SS pin, 0.8-V ±0.8% reference voltage, and monotonic startup into pre-biased outputs-used in industrial power supplies and consumer DTV/STB designs.

For engineers reviewing the TPS54336DDA datasheet, TPS54336DDA pinout, TPS54336DDA application, or TPS54336DDA equivalent, key selection considerations include its SO PowerPAD™ 8-pin package, BOOT-PH UVLO threshold (2.1 V), hiccup-mode overcurrent protection, thermal shutdown at 160°C, and compatibility with standard buck layout practices for 5-V/12-V distributed bus regulation.

Technical Context

The TPS54336DDA implements constant-frequency peak current-mode control with internal slope compensation to prevent subharmonic oscillation across duty cycles. Its error amplifier uses transconductance (1300 µmhos) and compares VSENSE against either the 0.8-V reference or SS pin voltage-enabling tracking and programmable soft-start.

Startup behavior is monotonic into pre-biased outputs by inhibiting both MOSFETs until SS voltage exceeds VSENSE. Overvoltage transition protection activates when VOUT > 106% of nominal, forcing high-side turn-off until VOUT drops below 104%, while BOOT-PH UVLO (2.1 V typical) disables high-side switching to allow capacitor recharge.

Key Specifications

Pinout & Package

TPS54336DDA uses the SO PowerPAD™ 8-pin package (4.89 mm × 3.90 mm) with exposed thermal pad connected to GND for enhanced thermal performance. Pin 9 is the exposed thermal pad (GND).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck converter applications.

Compared with TPS54336DDA, TPS54335DDA offers frequency flexibility but removes soft-start adjustability, while LM2678SD-5.0/NOPB trades precision regulation and advanced protection for higher current and lower BOM cost-making TPS54336DDA optimal for designs needing controlled ramp-up, output tracking, and robust fault handling.

Availability

TPS54336DDA is available at Aetrix Electronics and suitable for industrial power supplies, consumer DTV/STB platforms, and smart meter auxiliary rails requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for TPS54336DDA includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management ICs, with decades of expertise in high-reliability power conversion solutions.

The TPS5433x product line delivers highly integrated, thermally optimized synchronous buck converters for space-constrained, efficiency-critical applications in consumer, industrial, and automotive electronics.

FAQ

What is the maximum recommended output current for TPS54336DDA under continuous operation?

The TPS54336DDA supports up to 3 A of continuous output current when used with appropriate PCB layout, thermal vias to the exposed PowerPAD™, and adequate input/output capacitance. Derating applies above 85°C ambient; full 3-A capability requires junction temperature ≤125°C per thermal metrics (R_θJA = 42.1°C/W).

Does TPS54336DDA support startup into a pre-biased output voltage?

Yes, TPS54336DDA supports monotonic startup into pre-biased outputs. It prevents low-side MOSFET conduction until the SS pin voltage exceeds the VSENSE voltage, eliminating output discharge and ensuring clean, non-inverting ramp-up even when VOUT is initially non-zero.

What is the function of the SS pin on TPS54336DDA, and how is soft-start time calculated?

The SS pin on TPS54336DDA controls soft-start duration and enables output voltage tracking. An external capacitor (C_SS) to ground sets the rise time: t_SS(10–90%) = 0.8 V × C_SS / 2.3 µA. For example, a 100-nF capacitor yields ~35 ms soft-start. The SS pin voltage also overrides the internal 0.8-V reference during startup.

Can TPS54336DDA operate with an input voltage lower than 4.5 V?

No, TPS54336DDA has a minimum recommended input voltage of 4.5 V per datasheet specifications. Below this, undervoltage lockout (UVLO) disables operation. The VIN UVLO rising threshold is 4.5 V typical with 180-mV hysteresis, meaning the device remains off until VIN rises above ~4.68 V after dropout.

What package type and thermal pad configuration does TPS54336DDA use?

TPS54336DDA uses the SO PowerPAD™ 8-pin package (DDA suffix) with dimensions 4.89 mm × 3.90 mm. Pin 9 is the exposed thermal pad, which must be soldered to a PCB ground plane using ≥4 thermal vias for optimal thermal performance and electrical stability.