Texas Instruments TPS54336ADDAR

Overview

TPS54336ADDAR 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 across a 4.5-V to 28-V input range. It features fixed 340-kHz switching frequency, adjustable soft-start via SS pin, 0.8-V ±0.8% reference voltage, and hiccup-mode overcurrent protection. It is used in industrial power supplies and distributed bus regulation.

For engineers reviewing the TPS54336ADDAR datasheet, TPS54336ADDAR pinout, TPS54336ADDAR application, or TPS54336ADDAR equivalent, key selection considerations include its fixed-frequency operation, SO PowerPAD™ 8-pin package, monotonic startup into pre-biased outputs, light-load pulse-skipping efficiency, and thermal shutdown with hiccup recovery.

Technical Context

The TPS54336ADDAR implements constant-frequency peak current-mode control with internal slope compensation to prevent subharmonic oscillation at duty cycles above 50%. Its error amplifier (1300 µmhos transconductance) drives the COMP pin for loop stability, while the SS pin provides external capacitor-controlled soft-start timing.

It integrates boot recharge diode functionality and monitors BOOT–PH voltage (UVLO threshold 2.1 V typical) to ensure high-side gate drive integrity. Overvoltage transition protection activates when VOUT exceeds 106% of nominal, disabling the high-side MOSFET until VOUT falls below 104%.

Key Specifications

Pinout & Package

TPS54336ADDAR is housed in an 8-pin SO PowerPAD™ package (4.89 mm × 3.90 mm) with exposed thermal pad soldered to PCB ground for enhanced thermal dissipation. The PowerPAD must be connected to internal ground planes via multiple vias.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS54336ADDAR, TPS54335ADDAR offers frequency adjustability but removes SS control, while MP2336HG-LL-Z provides higher input voltage margin and lower BOM cost but omits guaranteed monotonic startup and has distinct compensation requirements.

Availability

TPS54336ADDAR is available at Aetrix Electronics and suitable for industrial power supplies, distributed bus regulation, consumer display power, and car audio systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS54336ADDAR 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 company specializing in analog and embedded processing technologies, with leadership in power management ICs for industrial, automotive, and consumer markets.

The TPS5433xA product line delivers highly integrated synchronous buck converters targeting space-constrained, high-efficiency power supplies in applications demanding robust thermal performance and reliable startup behavior.

FAQ

What is the switching frequency of the TPS54336ADDAR?

The TPS54336ADDAR operates at a fixed internal switching frequency of 340 kHz, with typical variation between 272 kHz and 408 kHz across temperature and process. This frequency is not adjustable - unlike the TPS54335A family, which uses an external RT resistor. The fixed frequency simplifies EMI filter design and ensures consistent inductor sizing in production systems using the TPS54336ADDAR.

How does the TPS54336ADDAR handle pre-biased outputs during startup?

TPS54336ADDAR guarantees monotonic startup into pre-biased outputs by preventing both high-side and low-side MOSFETs from turning on until the SS pin voltage exceeds the VSENSE pin voltage. This behavior avoids reverse current flow through the low-side FET, protecting downstream circuitry. The SS pin's 2.3-µA internal current source charges an external capacitor to control the ramp rate, making this feature fully configurable in the TPS54336ADDAR.

What package type and thermal characteristics does the TPS54336ADDAR use?

The TPS54336ADDAR is packaged in an 8-pin SO PowerPAD™ (DDA) with a 4.89 mm × 3.90 mm body and exposed thermal pad. Its junction-to-board thermal resistance (R_θJB) is 31.8°C/W, and junction-to-ambient (R_θJA) is 42.1°C/W when mounted on a standard 2-layer PCB with thermal vias. Proper connection of the PowerPAD to a solid ground plane is essential to maintain ≤150°C maximum junction temperature under 3-A load.

Can the TPS54336ADDAR be used with input voltages below 4.5 V?

No - the TPS54336ADDAR has a specified minimum input voltage of 4.5 V per absolute maximum and recommended operating conditions. Below this, the internal UVLO circuit disables switching, and the device enters shutdown. Attempting operation at 4.0 V or lower risks failure to start or unstable regulation. For sub-4.5-V inputs, alternative regulators such as the TPS54202 or TPS6286x series should be evaluated instead of the TPS54336ADDAR.

What is the purpose of the SS pin on the TPS54336ADDAR?

The SS (soft-start) pin on the TPS54336ADDAR serves two functions: it controls output voltage ramp time during startup and enables output voltage tracking in multi-rail systems. An external capacitor connected from SS to GND sets the rise time of the internal reference voltage; the device's 2.3-µA internal current source charges this capacitor linearly. When used for tracking, the SS pin accepts an external voltage ramp to force the TPS54336ADDAR output to follow another supply rail.