Texas Instruments TPS542941RSAT

Overview

TPS542941 from Texas Instruments is a dual-channel synchronous step-down DC/DC converter with integrated 150 mΩ high-side and 100 mΩ low-side N-channel MOSFETs per channel, supporting 2 A on CH1 and 3 A on CH2. It operates across 4.5 V–18 V input, delivers adjustable 0.76 V–7 V outputs, and uses D-CAP2™ adaptive on-time control for fast transient response in point-of-load digital TV and STB power supplies.

For engineers reviewing the TPS542941 datasheet, TPS542941 pinout, TPS542941 application, or TPS542941 equivalent, key selection considerations include its dual-channel current capability, non-sinking pre-biased soft start, 700 kHz pseudo-fixed switching frequency, cycle-by-cycle over-current protection, and HTSSOP-16 PowerPAD™ package thermal performance.

Technical Context

The TPS542941 implements D-CAP2™ control using adaptive on-time PWM with internal ramp compensation-enabling stable operation with ceramic output capacitors and eliminating external loop compensation. Its two independent channels share no internal coupling but use identical control architecture, feedback reference (765 mV typ), and protection logic including hiccup-mode overload recovery.

Each channel features lossless low-side rDS(on) current sensing with thermal compensation (4000 ppm/°C), fixed 1.0 ms soft-start, and dedicated power-good outputs (PG1/PG2) with ±16% voltage window and 1.5 ms enable delay. The VREG5 5.5 V LDO powers internal circuitry and supports bootstrap capacitor charging.

Key Specifications

Pinout & Package

TPS542941 is housed in a 4.4 mm × 5.0 mm 16-pin HTSSOP (PWP) package with exposed PowerPAD™ thermal pad soldered to PCB ground for enhanced thermal dissipation (θJA = 47.5°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS542941, TPS542951RSAT offers higher per-channel current capacity in identical packaging-ideal for upgraded load requirements-while MP2492D-LF-Z trades integrated features like VREG5 and D-CAP2™ simplicity for lower unit cost and fixed-frequency predictability.

Availability

TPS542941 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 consistent parametric performance across production batches.

Supply support for TPS542941 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 TPS542941 belongs to TI's D-CAP2™ synchronous buck converter product line, engineered specifically for high-efficiency, low-component-count point-of-load regulation in space-constrained consumer and computing applications.

FAQ

What is the recommended input capacitor configuration for TPS542941?

TPS542941 requires a minimum 10 µF ceramic bulk capacitor on each VINx rail, plus 0.1 µF X5R/X7R ceramic capacitors placed directly between pins 1/VIN1 and 16/VIN2 to PGND. This dual-stage decoupling suppresses high-frequency switching noise and prevents SW node overshoot. The TPS542941 datasheet specifies these values based on measured stability margins across 4.5–18 V input range and full load conditions.

Does TPS542941 support independent enable and power-good signaling per channel?

Yes, TPS542941 provides fully independent EN1/EN2 inputs and PG1/PG2 open-drain outputs. Each EN pin controls its respective channel with 2.0 V H-threshold and 0.4 V L-threshold; each PG pin asserts high after soft-start when its output voltage remains within ±16% of the programmed value for 1.5 ms. This enables flexible power sequencing in multi-rail systems without external logic.

How does the non-sinking pre-biased soft start function in TPS542941?

TPS542941 implements non-sinking pre-biased soft start by monitoring the internal VFBx voltage against the rising soft-start DAC reference. When the DAC voltage exceeds VFBx, the controller initiates low-side FET gate pulses with narrow, incrementally increasing on-time-avoiding reverse current flow into pre-charged outputs. This behavior is confirmed in the functional block diagram and startup timing waveforms of the TPS542941 datasheet.

What thermal performance can be expected from TPS542941 in HTSSOP-16 package?

In the HTSSOP-16 (PWP) package, TPS542941 achieves θJA = 47.5°C/W and θJB = 20.8°C/W when mounted on a standard 4-layer PCB with 1-in² 2-oz copper thermal pad connected to the PowerPAD™. At 2 A/3 A full load with 12 V input and 3.3 V/1.5 V outputs, junction temperature rise remains below 45°C above ambient-well within the 150°C max TJ rating and enabling reliable operation at 85°C ambient.

Can TPS542941 operate with ceramic output capacitors only?

Yes, TPS542941 is explicitly designed for ceramic output capacitors via its D-CAP2™ control architecture. The internal high-frequency zero compensates for the near-zero ESR of ceramics, ensuring stability without added series resistance or external compensation networks. The datasheet validates operation with 20–68 µF X5R/X7R ceramics and confirms <1% output deviation during 2 A load transients.