Texas Instruments TPS54824RNVT

Overview

TPS54824 from Texas Instruments is an 8-A synchronous step-down DC/DC converter in a 3.5-mm × 3.5-mm HotRod™ QFN package, featuring integrated 14.1-mΩ high-side and 6.1-mΩ low-side MOSFETs, 0.6-V ±0.85% reference voltage, and 200-kHz to 1.6-MHz adjustable switching frequency. It delivers regulated 1.5-V output from 12-V input in telecom power rails with hiccup current limiting and pre-bias startup capability.

For engineers reviewing the TPS54824 datasheet, TPS54824 pinout, TPS54824 application, or TPS54824 equivalent, key selection criteria include its 8-A continuous output current, 4.5-V to 17-V input range, thermal shutdown at 170°C, PGOOD monitoring with 91–106% V_REF window, and RT/CLK synchronization support for system-level clock alignment.

Technical Context

The TPS54824 implements peak current mode control with internal slope compensation to ensure stable CCM operation across all loads and prevent subharmonic oscillation. Its oscillator supports both resistor-programmed (RT mode) and external clock-synchronized (PLL mode) operation via the RT/CLK pin, with timing delay of 70 ns from RT/CLK falling edge to SW rising edge.

It integrates BOOT-to-SW UVLO (2.2–2.6 V) to manage bootstrap capacitor recharge, enables 100% duty cycle operation when BOOT-SW voltage exceeds threshold, and uses dual overcurrent protection: high-side peak limit (10.8–15 A) and bidirectional low-side sourcing/sinking limits (±3.4 to +13.6 A).

Key Specifications

Pinout & Package

TPS54824 is housed in an 18-pin RNV (HotRod™ QFN) package, 3.5 mm × 3.5 mm, with exposed thermal pad (PGND-connected) for enhanced thermal performance. Pin 1 is BOOT; pins 2 & 11 are VIN; pins 3,4,5,8,9,10 are PGND; pins 6 & 7 are SW; pin 12 is AGND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS54824, TPS54821RHLR trades current capacity and sync capability for lower cost, while MP8770GQ-Z sacrifices supervision, accuracy, and configurability for compactness-making TPS54824 optimal for high-reliability, multi-rail, thermally constrained designs requiring full feature set.

Availability

TPS54824 is available at Aetrix Electronics and suitable for telecom infrastructure, server power delivery, and medical imaging equipment requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for TPS54824 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 technologies, with decades of expertise in high-performance DC/DC conversion.

The TPS54824 belongs to TI's SWIFT™ synchronous buck converter family, designed specifically for space-constrained, high-current point-of-load applications demanding efficiency, reliability, and advanced protection features.

FAQ

What is the maximum input voltage rating for the TPS54824?

The TPS54824 has an absolute maximum input voltage rating of 19 V on the VIN pin, with recommended operating range from 4.5 V to 17 V. Exceeding 19 V risks permanent damage per Absolute Maximum Ratings. The device includes VIN UVLO with 4.1–4.3 V turn-on threshold and 200-mV hysteresis, ensuring robust startup behavior under brownout conditions. TPS54824 maintains regulation and protection functionality across this full operating range.

Does the TPS54824 support synchronization to an external clock?

Yes, the TPS54824 supports external clock synchronization via the RT/CLK pin in PLL mode, accepting input frequencies from 200 kHz to 1.6 MHz. The device aligns its switching edge to the falling edge of the external clock with a typical delay of 70 ns. This capability enables deterministic timing across multiple rails in systems such as FPGAs or high-speed ADCs where phase coherence is critical. TPS54824 retains full protection and regulation functionality during synchronization.

How does the TPS54824 handle startup into a pre-biased output?

The TPS54824 implements safe monotonic startup into pre-biased outputs by disabling the high-side MOSFET until the SS/TRK voltage exceeds the FB voltage, preventing reverse current flow through the low-side MOSFET. This behavior is inherent to its control architecture and requires no external components. The device maintains this protection across temperature and load conditions, making it suitable for hot-swap and redundant power systems. TPS54824 achieves this without compromising soft-start programmability or regulation accuracy.

What thermal metrics define the TPS54824's cooling performance?

The TPS54824 specifies junction-to-board thermal resistance (Θ_JB) of 18.8°C/W and junction-to-case (bottom) resistance (Θ_JCbot) of 1.2°C/W under JEDEC standards. On a 2-layer evaluation board, Θ_JA is 25°C/W-significantly better than the 57.1°C/W value for standard JEDEC boards. These metrics assume proper thermal pad soldering to a solid PGND plane. TPS54824 leverages its HotRod™ QFN construction to minimize thermal impedance, enabling 8-A operation without forced air in most industrial layouts.

Can the TPS54824's output voltage be adjusted below 0.6 V?

No, the TPS54824's internal voltage reference is fixed at 0.6 V ±0.85%, and the FB pin regulates to this reference. The minimum achievable output voltage equals the reference value-0.6 V-when the bottom resistor (R_FBB) in the feedback divider is shorted (not recommended). For outputs below 0.6 V, an external reference or different converter architecture is required. All TPS54824 datasheet specifications, including accuracy and load regulation, apply strictly within the 0.6-V to 12-V output range. TPS54824 does not support sub-0.6-V operation.