Texas Instruments TPS560430X3FDBVT

Overview

TPS560430X3FDBVT from Texas Instruments is a synchronous step-down DC-DC converter delivering up to 600 mA output current with fixed 3.3-V output, 1.1-MHz switching frequency, and forced PWM (FPWM) operation for constant-frequency low-ripple regulation across full load range. It operates from 4 V to 36 V input, supports startup with pre-biased output, and targets industrial power rails in PLCs and motor drives.

For engineers reviewing the TPS560430X3FDBVT datasheet, TPS560430X3FDBVT pinout, TPS560430X3FDBVT application, or TPS560430X3FDBVT equivalent, key selection criteria include its FPWM mode stability under light load, ±1.5% reference tolerance over –40°C to 125°C, integrated high- and low-side MOSFETs (R_DS(on) = 450 mΩ / 240 mΩ), 60 ns minimum on-time, and SOT-23-6 package compatibility with space-constrained designs.

Technical Context

The TPS560430X3FDBVT employs fixed-frequency peak-current mode control with internal compensation, eliminating external loop components. Its FPWM operation maintains 1.1 MHz switching across 0–600 mA load, ensuring tight line/load regulation and minimal output voltage ripple-critical for noise-sensitive analog or communication subsystems.

It integrates bootstrap gate drive for the high-side NMOS, uses precision enable with 1.1–1.36 V rising threshold and 120 µA quiescent current in PFM mode, and implements hiccup-mode short-circuit protection triggered when FB falls below 40% of V_REF, with 135 ms hiccup interval and thermal shutdown at 170°C.

Key Specifications

Pinout & Package

SOT-23-6 package (2.90 mm × 1.60 mm), thermally enhanced with exposed pad (not electrically connected), suitable for reflow assembly and high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS560430X3FDBVT, TPS560430X3FDBVR offers identical functionality in volume-optimized packaging, while TPS560200DBVT trades FPWM stability and 36-V capability for lower input voltage support and reduced cost - making it suitable only for non-automotive, low-voltage applications where ripple and transient consistency are secondary.

Availability

TPS560430X3FDBVT is available at Aetrix Electronics and suitable for industrial PLCs, motor drive control logic, smart HVAC controllers, and automotive camera modules requiring stable component supply with guaranteed long-term sourcing.

Supply support for TPS560430X3FDBVT 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 designing analog ICs, embedded processors, and power management solutions for industrial, automotive, and communications markets.

The TPS560430 family delivers rugged, easy-to-use synchronous buck converters targeting wide-input industrial power supplies - emphasizing small solution size, internal compensation, and robust protection for harsh environments.

FAQ

What is the output voltage tolerance of the TPS560430X3FDBVT over temperature?

The TPS560430X3FDBVT provides a fixed 3.3-V output with ±1.5% tolerance over the full operating junction temperature range of –40°C to 125°C. This is derived from its ±10 mV reference voltage (1.000 V ±10 mV) and internal resistor divider matching. Measured output at 25°C is typically 3.30 V, with worst-case deviation remaining within 3.25 V to 3.35 V across temperature and line/load conditions.

Does the TPS560430X3FDBVT require external feedback resistors?

No, the TPS560430X3FDBVT does not require external feedback resistors. It is the fixed 3.3-V version of the TPS560430 family, with the resistor divider integrated internally. The FB pin is not user-accessible for adjustment - this eliminates component count, layout sensitivity, and resistor tolerance errors, simplifying design and improving long-term output stability.

Can the TPS560430X3FDBVT operate with a 3.8-V input supply?

No, the TPS560430X3FDBVT cannot reliably operate with a 3.8-V input. Its absolute minimum recommended input voltage is 4 V, and the undervoltage lockout (UVLO) rising threshold is specified at 3.55–4.00 V. At 3.8 V, the device may intermittently enable or fail to start, especially under temperature variation or load transients. For sub-4-V operation, consider alternative regulators like the TPS560200.

What is the purpose of the CB pin on the TPS560430X3FDBVT?

The CB pin on the TPS560430X3FDBVT is the bootstrap capacitor connection terminal. It must be tied via a 100-nF X7R or X5R ceramic capacitor (16 V rating) to the SW pin to generate the gate drive voltage for the internal high-side MOSFET. This charge pump arrangement enables efficient synchronous rectification without an external driver, and improper CB capacitor selection or placement causes startup failure or erratic switching.

How does the hiccup-mode protection work in the TPS560430X3FDBVT?

The TPS560430X3FDBVT enters hiccup mode when the FB voltage drops below 40% of the internal reference (i.e., <0.4 V) for 256 consecutive switching cycles - indicating sustained overload or short circuit. It then shuts down for 135 ms (typ.), after which it attempts automatic restart. If the fault persists, the cycle repeats. This limits average power dissipation and junction temperature rise, protecting both the TPS560430X3FDBVT and external components during extended fault conditions.