Texas Instruments TPS54336ADRCR

Overview

TPS54336ADRCR from Texas Instruments is a synchronous step-down DC-DC converter IC 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 - deployed in industrial power supplies and consumer electronics requiring stable 5-V/12-V bus regulation.

For engineers reviewing the TPS54336ADRCR datasheet, TPS54336ADRCR pinout, TPS54336ADRCR application, or TPS54336ADRCR equivalent, key selection criteria include its VSON-10 (DRC) package thermal performance (R_θJB = 18.9°C/W), monotonic pre-biased startup capability, pulse-skipping light-load efficiency, and BOOT-PH UVLO threshold of 2.1 V (typical).

Technical Context

The TPS54336ADRCR implements fixed-frequency peak current-mode control with internal oscillator set to 340 kHz (±20%), enabling predictable loop response and simplified EMI filtering. Its error amplifier (1300 µmhos transconductance) drives the COMP pin for external Type-II/III compensation, while slope compensation prevents subharmonic oscillation above 50% duty cycle.

Startup behavior is governed by the SS pin: an external capacitor sets soft-start time (t_SS = 0.8 × C_SS(nF) / 2.3(µA) for 10–90% ramp), overriding the internal 0.8-V reference until voltage tracking completes. The device also enforces monotonic startup into pre-biased outputs by inhibiting both MOSFETs until SS > VSENSE.

Key Specifications

Pinout & Package

TPS54336ADRCR is housed in a 10-pin VSON package (DRC) with 3.0 mm × 3.0 mm body and exposed thermal pad. The package requires solder connection of the thermal pad to PCB ground plane using ≥4 thermal vias for optimal R_θJB = 18.9°C/W performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS54336ADRCR, TPS54335ADRCR offers frequency flexibility at the cost of fixed soft-start timing, while MP2336HGRT-Z trades startup safety and precision for higher current rating and broader input range - making TPS54336ADRCR optimal for sequenced, pre-biased, fixed-frequency industrial and consumer power rails.

Availability

TPS54336ADRCR is available at Aetrix Electronics and suitable for industrial power supplies, consumer set-top boxes, and automotive infotainment displays requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS54336ADRCR 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 and embedded processing technologies, with decades of expertise in power management IC design and manufacturing.

The TPS5433xA product line was developed specifically for high-efficiency, medium-current DC-DC conversion in space-constrained industrial, consumer, and automotive applications - emphasizing integration, thermal performance, and robust protection.

FAQ

What is the recommended soft-start capacitor value for TPS54336ADRCR to achieve a 10-ms startup time?

For a 10-ms soft-start time (10% to 90%), use CSS ≈ (10 ms × 2.3 µA) / 0.8 = 28.75 nF. A standard 27-nF or 33-nF X7R ceramic capacitor is recommended. The TPS54336ADRCR's internal 2.3-µA SS charge current ensures predictable ramp rate independent of input voltage or temperature, enabling reliable sequencing in multi-rail systems.

Does TPS54336ADRCR support operation with a pre-biased output voltage?

Yes, the TPS54336ADRCR supports monotonic startup into pre-biased outputs. It disables both high-side and low-side MOSFETs until the SS pin voltage exceeds the VSENSE pin voltage, preventing reverse current flow and ensuring controlled voltage ramp-up. This behavior is confirmed in the datasheet's Section 7.3.8 and is intrinsic to the TPS54336ADRCR's architecture - no external circuitry is required.

What is the maximum achievable output voltage accuracy for TPS54336ADRCR under full temperature range?

The TPS54336ADRCR provides a 0.8-V reference with ±1.5% accuracy over –40°C to 150°C junction temperature. When combined with 1% feedback resistors and typical layout-induced errors, total output voltage error remains within ±2.5% across temperature and line/load conditions - verified in Electrical Characteristics Table 6.5 and Figure C003 of the datasheet.

Can TPS54336ADRCR be used with input voltages below 4.5 V?

No - the absolute minimum input voltage for TPS54336ADRCR is 4.5 V per Recommended Operating Conditions (Section 6.3). Operation below this violates the UVLO threshold (4.5 V rising) and risks improper gate drive, unstable regulation, or undefined protection behavior. For sub-4.5-V inputs, consider TI's TPS6286x or similar low-input buck converters.

How does the BOOT-PH UVLO function protect TPS54336ADRCR during startup?

The TPS54336ADRCR monitors BOOT-PH voltage and disables the high-side MOSFET if it falls below 2.1 V (typical), forcing the low-side MOSFET on to recharge the bootstrap capacitor. This prevents shoot-through and gate-drive failure during low-duty-cycle or high-frequency operation. The feature is active during all operating modes and is specified in Section 6.5 and Figure C013 of the TPS54336ADRCR datasheet.