Texas Instruments TPS62865RQYR

Overview

TPS62865RQYR from Texas Instruments is a 4-A synchronous step-down DC/DC converter with DCS-Control topology, 2.4-MHz switching frequency, 1% output voltage accuracy, and 4-µA quiescent current. It operates from 2.4 V to 5.5 V input and delivers adjustable or fixed output voltages down to 0.6 V - used as core supply for FPGAs and ASICs in space-constrained industrial and embedded systems.

For engineers reviewing the TPS62865RQYR datasheet, TPS62865RQYR pinout, TPS62865RQYR application, or TPS62865RQYR equivalent, key selection considerations include its 1.5-mm × 2.5-mm QFN-9 package, forced-PWM/power-save mode flexibility, hiccup short-circuit protection, 100% duty cycle capability, and integrated power-good indicator with window comparator.

Technical Context

The TPS62865RQYR implements DCS-Control architecture-combining hysteretic and current-mode control-to enable seamless PWM-to-power-save mode transition without output disturbance. Its internal 11-mΩ high-side and 10.5-mΩ low-side MOSFETs support high efficiency across load range, while the VOS pin enables precise output voltage sensing and discharge control.

Functional modes are configured via the VSET/MODE pin: during startup, an external resistor sets fixed output voltage (e.g., 0.9 V, 1.2 V, 1.8 V); post-startup, logic level selects forced-PWM (for low ripple) or power-save mode (for ultra-low IQ). The PG pin provides open-drain power-good signaling with 34-µs deglitch and ±9% window tolerance referenced to VOUT.

Key Specifications

Pinout & Package

TPS62865RQYR is housed in a 1.5-mm × 2.5-mm, 9-pin QFN package (RQY) with exposed thermal pad. Pin 1 is AGND; pin 2 is PGND; pin 3 is VIN; pin 4 is EN; pin 5 is PG; pin 6 is VSET/MODE; pin 7 is SW; pin 8 is VOS; pin 9 is FB.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous step-down converter applications.

Compared with TPS62867RQYR, the TPS62865RQYR trades peak current headroom for tighter light-load efficiency and lower BOM cost; versus TPS62933RQYR, it delivers higher output current and simpler control but lacks spread-spectrum and has looser accuracy - making it optimal for cost-sensitive, space-constrained digital core supplies.

Availability

TPS62865RQYR is available at Aetrix Electronics and suitable for FPGA core supplies, machine vision cameras, solid-state drives, and optical modules requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for TPS62865RQYR 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 company headquartered in Dallas, Texas, designing and manufacturing analog ICs, embedded processors, and power management solutions for industrial, automotive, and communications markets.

The TPS6286x family was developed to deliver ultra-high power density DC/DC conversion for portable and space-constrained electronics - targeting FPGA, ASIC, and high-speed interface power rails where small size, fast transient response, and low quiescent current are essential.

FAQ

What is the maximum output current supported by the TPS62865RQYR?

The TPS62865RQYR supports up to 4 A of continuous output current, as specified in TI's official datasheet (SLUSDN8, March 2021). This rating applies across the full operating temperature range (–40°C to 125°C junction) and input voltage range (2.4 V to 5.5 V), with derating required only under elevated ambient or poor PCB thermal conditions. The TPS62865RQYR's 11-mΩ high-side and 10.5-mΩ low-side MOSFETs enable this current capability in its 1.5-mm × 2.5-mm QFN package.

Does the TPS62865RQYR support both fixed and adjustable output voltage configurations?

Yes, the TPS62865RQYR supports both configurations. Fixed output voltages (e.g., 0.9 V, 1.2 V, 1.8 V) are selected using a resistor between the VSET/MODE pin and GND during startup, per TI's R2D converter table. Adjustable operation uses the FB pin with an external resistor divider and requires connecting VSET/MODE to logic high or low post-startup to select forced-PWM or power-save mode. In fixed mode, the FB pin is tied directly to VOUT.

How does the power-good (PG) function work on the TPS62865RQYR?

The TPS62865RQYR's PG pin is an open-drain output that signals valid regulation using a window comparator referenced to VOUT sensed at the VOS pin. It asserts high-Z when VOS is within 91%–111% of nominal VOUT, and pulls low during undervoltage, overvoltage, shutdown, or thermal fault. A 34-µs deglitch filter prevents false triggering. The PG signal can sequence other rails by connecting to their EN pins, and requires an external pull-up resistor to ≤5.5 V.

Can the TPS62865RQYR operate with input voltage close to the output voltage?

Yes, the TPS62865RQYR supports 100% duty cycle operation, enabling regulation when VIN approaches VOUT. In this mode, the high-side FET remains continuously on while the low-side FET is off. Minimum input voltage is determined by VOUT + (RDS(on) + DCR) × IOUT,MAX. For example, at 4 A and 0.9 V output, VIN,MIN ≈ 0.9 V + (11 mΩ + 5 mΩ) × 4 A = ~0.96 V - allowing operation from severely drooped input rails.

What thermal protection features does the TPS62865RQYR include?

The TPS62865RQYR includes thermal shutdown with a 150°C trip threshold and 20°C hysteresis. When junction temperature exceeds 150°C, the device stops switching, activates output discharge via the VOS pin, and holds PG low. Once temperature falls below 130°C, it automatically resumes operation with internal soft-start. This behavior is fully specified in Section 7.5 of the datasheet and requires no external components to implement.