Texas Instruments TPS54394PWP

Overview

TPS54394PWP from Texas Instruments is a dual-channel synchronous step-down DC/DC converter with integrated 90 mΩ high-side and 60 mΩ low-side N-channel MOSFETs per channel, supporting 3 A continuous output current per channel over 4.5 V–18 V input and 0.76 V–7 V output ranges. It employs D-CAP2™ adaptive on-time control for fast transient response without external compensation and delivers 700 kHz pseudo-fixed switching frequency in PWM mode.

For engineers reviewing the TPS54394PWP datasheet, TPS54394PWP pinout, TPS54394PWP application, or TPS54394PWP equivalent, key selection considerations include dual independent regulation, non-sinking pre-biased soft start, loss-less low-side current sensing, thermal shutdown at 155°C, and PowerGood monitoring with ±16% voltage window and 1.5 ms delay.

Technical Context

The TPS54394PWP implements two independent D-CAP2™ control loops-each combining adaptive on-time PWM with internal ramp injection to enable stable operation with ceramic or ultra-low-ESR output capacitors without external compensation. Its valley-current sensing uses thermally compensated rDS(on) of the low-side FET for cycle-by-cycle over-current protection.

Auto-Skip Eco-mode™ dynamically transitions between continuous conduction mode (CCM) and discontinuous conduction mode (DCM) to maintain high efficiency at light loads, while fixed 1 ms soft-start and hiccup-mode overload protection ensure robust power-up and fault recovery behavior across –40°C to 85°C ambient operation.

Key Specifications

Pinout & Package

TPS54394PWP is housed in a 16-pin HTSSOP (PWP) package with exposed PowerPAD thermal pad requiring solder connection to PCB ground plane for thermal management. Pin numbering follows standard top-view orientation with Pin 1 at bottom-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS54394PWP, TPS54395PWP adds soft-start flexibility at identical cost and footprint, while MP8765GQ-Z trades D-CAP2™ simplicity for current-mode precision and wider input range-making TPS54394PWP optimal for rapid, low-component-count dual-rail designs.

Availability

TPS54394PWP is available at Aetrix Electronics and suitable for digital TV power supplies, networking home terminals, and digital set-top box applications requiring stable component supply, long-term lifecycle support, and traceable sourcing from authorized channels.

Supply support for TPS54394PWP 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 broad industrial, automotive, and consumer design expertise.

The TPS54394PWP belongs to TI's D-CAP2™ synchronous buck converter product line, engineered for high-efficiency, low-external-component point-of-load regulation in space- and cost-sensitive consumer electronics.

FAQ

What is the maximum recommended input voltage for TPS54394PWP?

The absolute maximum input voltage rating for TPS54394PWP is 20 V, but the recommended operating range is 4.5 V to 18 V. Exceeding 18 V risks violating safe operating area limits under transient conditions, especially at elevated temperatures. The device includes UVLO protection on VREG5 that disables operation below 3.83 V, ensuring clean startup. Always verify input ripple and surge margins in final design using the 20 V absolute max as a hard limit-not an operational target-for TPS54394PWP.

Does TPS54394PWP support independent enable and power-good signaling per channel?

Yes, TPS54394PWP provides fully independent control and monitoring: EN1/EN2 enable pins and PG1/PG2 open-drain outputs are electrically isolated per channel. Each PGx asserts high when its respective output voltage remains within ±16% of the programmed VFBx reference for ≥1.5 ms after soft-start completion. This enables precise rail sequencing in multi-voltage systems-such as enabling a 3.3 V I/O rail before a 1.2 V core rail-without external logic. All functions operate correctly with TPS54394PWP's specified –40°C to 85°C ambient range.

Can TPS54394PWP operate with ceramic output capacitors only?

Yes, TPS54394PWP is explicitly designed for ceramic output capacitors via its D-CAP2™ control architecture, which eliminates the need for ESR-based compensation. The internal ramp generator stabilizes the loop even with near-zero-ESR ceramics (e.g., X5R/X7R 22 µF ×2), enabling smaller footprints and lower output ripple. TI recommends 20 µF–68 µF total ceramic capacitance per channel, with typical designs using dual 22 µF capacitors. No tantalum, aluminum electrolytic, or polymer capacitors are required for stability-TPS54394PWP achieves this with no external compensation components.

What thermal management is required for TPS54394PWP at full 3 A load per channel?

At full 3 A per channel with 12 V input and 3.3 V/1.5 V outputs, TPS54394PWP dissipates ~1.2 W. To maintain junction temperature ≤125°C at 85°C ambient, the HTSSOP-16 PowerPAD must be soldered to a ≥250 mm² internal or external GND copper plane with ≥6 thermal vias (0.3 mm diameter, 0.8 mm pitch). Without this, θJA rises from 41.4°C/W to >60°C/W, risking thermal shutdown. TI's layout guidelines specify 100% solder coverage of the exposed pad-verified by X-ray inspection-and avoid solder mask over the pad for TPS54394PWP reliability.

How does TPS54394PWP handle pre-biased output conditions during startup?

TPS54394PWP implements non-sinking pre-biased soft start: when ENx goes high and VFBx > internal soft-start DAC voltage, the controller initiates low-side FET gate pulses with narrow, incrementally increasing on-time-avoiding reverse current flow into the pre-charged rail. This prevents output voltage collapse and bus contention in hot-swap or multi-regulator systems. The feature operates automatically with no external components and is validated across the full –40°C to 85°C range. Unlike basic soft-start, this behavior is intrinsic to TPS54394PWP's control architecture and requires no configuration.