Texas Instruments TPS54061DRBR

Overview

TPS54061DRBR from Texas Instruments is a 60-V input, 200-mA synchronous step-down DC-DC converter with integrated high-side (1.5 Ω) and low-side (0.8 Ω) MOSFETs, 90 µA non-switching quiescent current, adjustable 50–1100 kHz switching frequency, and 0.8 V ±1% reference voltage. It enables compact bias supplies in industrial sensors and metering systems requiring wide-input, low-I_Q regulation.

For engineers reviewing the TPS54061DRBR datasheet, TPS54061DRBR pinout, TPS54061DRBR application, or TPS54061DRBR equivalent, key selection criteria include its 60-V max input rating, diode-emulation light-load efficiency, EN-pin-adjustable UVLO, internal slow-start (2.36 ms), and thermal-pad-equipped VSON-8 package for high-power-density designs.

Technical Context

The TPS54061DRBR implements peak current-mode control with slope compensation to prevent subharmonic oscillation and supports both resistor-programmed (RT/CLK-to-ground) and external clock synchronization (300–1100 kHz). Its transconductance error amplifier (108 µS typical) drives the COMP pin for loop compensation, while cycle-by-cycle current limiting clamps COMP at 350 mA threshold.

Internal protection includes thermal shutdown (176°C), output overvoltage lockout (109% V_OUT), frequency foldback during overload, and BOOT-PH UVLO (2.9 V) to ensure high-side gate drive integrity. The device operates across –40°C to 150°C junction temperature with stable regulation using ceramic or low-cost aluminum electrolytic output capacitors.

Key Specifications

Pinout & Package

VSON-8 (DRB) package: 3.00 mm × 3.00 mm body with exposed thermal pad (Pin 9) requiring PCB solder connection for thermal performance and electrical grounding. Junction-to-board thermal resistance is 18.1°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM5164DRR and TPS54260DGQR, the TPS54061DRBR delivers the lowest quiescent current (90 µA), smallest footprint (VSON-8), and best light-load efficiency via diode emulation-making it optimal for space- and power-constrained 200-mA industrial bias supplies.

Availability

TPS54061DRBR is available at Aetrix Electronics and suitable for industrial process control, 4–20 mA sensor powering, and low-power standby supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS54061DRBR 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 connectivity solutions for industrial, automotive, and consumer markets.

The TPS54061DRBR belongs to TI's wide-input DC-DC converter product line, engineered specifically for high-voltage, low-quiescent-current applications in industrial automation, metering, and sensor interfaces where reliability and thermal efficiency are critical.

FAQ

What is the minimum controllable on-time of the TPS54061DRBR, and how does it affect high-input-voltage operation?

The TPS54061DRBR has a minimum controllable on-time of 120 ns. At high input voltages (e.g., 60 V), this limits the maximum achievable switching frequency to maintain required duty cycle-for example, regulating 5 V from 60 V requires ~8.3% duty cycle, constraining f_SW to ≤670 kHz. The device mitigates this via frequency shift (division by 2/4/8) during startup or overload to extend off-time and prevent inductor current runaway.

Can the TPS54061DRBR operate with ceramic output capacitors, and what is the minimum recommended value?

Yes, the TPS54061DRBR is explicitly designed for stability with ceramic output capacitors. Texas Instruments recommends ≥4.7 µF total capacitance with low ESR (≤10 mΩ) for optimal transient response and loop stability. Ceramic capacitors eliminate the size, lifetime, and ESR limitations of aluminum electrolytics, enabling smaller, more reliable designs.

How is the enable pin (EN) used to adjust undervoltage lockout (UVLO) on the TPS54061DRBR?

The EN pin features a 1.2 µA internal pull-up current source. By connecting two resistors (R_UVLO1, R_UVLO2) between VIN, EN, and GND, the UVLO start/stop thresholds can be scaled-e.g., setting R_UVLO1 = 1.2 MΩ and R_UVLO2 = 240 kΩ raises UVLO to 12 V start / 10.8 V stop. This protects downstream circuitry from brownout during unstable input conditions.

What thermal design considerations apply to the TPS54061DRBR's exposed thermal pad (Pin 9)?

The exposed thermal pad (Pin 9) must be electrically and thermally connected to a dedicated PCB copper pour tied to GND. TI specifies minimum solder mask opening and ≥6 thermal vias (0.3 mm diameter) to an inner ground plane. With proper layout, junction-to-board thermal resistance drops to 18.1°C/W, enabling full 200 mA output at 150°C ambient without derating.

Does the TPS54061DRBR support synchronization to an external clock, and what are the timing requirements?

Yes, the TPS54061DRBR synchronizes to external clocks applied to the RT/CLK pin across 300–1100 kHz. The clock signal must swing below 0.5 V (low) and above 1.8 V (high), with pulse widths ≥40 ns. The rising edge of the PH pin aligns to the falling edge of the RT/CLK signal. A default RT resistor must remain connected to ground to ensure fallback operation if the clock stops.