Texas Instruments TPS65283-1RGER

Overview

TPS65283-1RGER from Texas Instruments is a synchronous dual buck DC-DC converter with integrated power distribution switch, delivering up to 3.5 A on Buck1 (1.2 V output) and 2.5 A on Buck2 (5 V output), operating from 4.5–18 V input. It features 0.6 V ±1% feedback reference, adjustable 200 kHz–2 MHz switching frequency, and pulse-skipping mode (PSM) for light-load efficiency in USB port and set-top box power rails.

For engineers reviewing the TPS65283-1RGER datasheet, TPS65283-1RGER pinout, TPS65283-1RGER application, or TPS65283-1RGER equivalent, this device supports pre-biased start-up, monotonic sequencing, external clock synchronization, and precision current-limited power distribution-critical for automotive infotainment and network gateway designs requiring stable dual-rail regulation and fault-protected load switching.

Technical Context

The TPS65283-1RGER implements constant-frequency peak-current-mode control with 180° out-of-phase operation between Buck1 and Buck2 to minimize input ripple and reduce input capacitor size. Its internal 2.4-ms soft-start, cycle-by-cycle current limiting, and hiccup-mode protection (4 ms wait / 64 ms restart) ensure robust startup and short-circuit resilience.

It integrates two independent synchronous buck controllers with high-side/low-side MOSFETs (R_DS(on) = 100/65 mΩ for Buck1; 140/95 mΩ for Buck2), plus an N-channel power distribution switch (60 mΩ R_DS(on), 2.4–6 V input, programmable 0.15–2.7 A current limit via RSET), all managed under unified thermal shutdown (160°C trip, 20°C hysteresis).

Key Specifications

Pinout & Package

TPS65283-1RGER uses a thermally enhanced 24-pin VQFN (RGE) package, 4.0 mm × 4.0 mm, with exposed thermal pad soldered to PGND for optimal junction-to-board thermal resistance (R_θJB = 14.5°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-buck with power switch applications.

Compared with TPS65283RGER and TPS65217CRSLR, the TPS65283-1RGER uniquely balances high-current dual buck performance, programmable PSM, and standalone power-switch protection in a 4×4 mm footprint-making it optimal for AC-powered, thermally constrained infrastructure equipment.

Availability

TPS65283-1RGER is available at Aetrix Electronics and suitable for USB ports and hubs, set-top boxes, digital TVs, and DSL/cable modems requiring stable component supply across extended temperature and long production lifecycles.

Supply support for TPS65283-1RGER 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 automotive-grade reliability validation.

The TPS65283-1RGER belongs to TI's high-efficiency dual-buck PMIC product line, engineered specifically for compact, high-density consumer and networking equipment demanding precise dual-rail regulation and intelligent load switching.

FAQ

What is the key functional difference between TPS65283-1RGER and TPS65283RGER?

The TPS65283-1RGER operates in pulse-skipping mode (PSM) at light loads to minimize quiescent current and maximize efficiency below 100 mA, whereas the TPS65283RGER remains in continuous conduction mode (CCM) across all loads. This makes the TPS65283-1RGER ideal for always-on consumer devices like home gateways, while the TPS65283RGER suits applications requiring deterministic PWM timing, such as audio subsystems. Both share identical pinout, package, and maximum current ratings.

How does the TPS65283-1RGER handle pre-biased output capacitors during startup?

The TPS65283-1RGER guarantees monotonic start-up into pre-biased loads by actively controlling high-side FET gate drive to prevent reverse current flow. Its current-mode architecture and internal soft-start (2.4 ms) coordinate with feedback loop behavior to ramp output voltage smoothly-even when VOUT is initially charged to 1.2 V or 5 V. This eliminates output voltage undershoot or oscillation that could reset downstream logic, a critical requirement in hot-swap USB and modular networking gear.

Can the TPS65283-1RGER's power distribution switch be used independently of the buck converters?

Yes-the power distribution switch (SW_IN/SW_OUT/nFAULT/RSET) operates fully independently of Buck1 and Buck2. It functions with SW_EN high (or floating) and requires only 2.4–6 V on SW_IN, regardless of VIN1/VIN2 status. The switch's 60 mΩ R_DS(on), ±10% current-limit accuracy at 1.25 A, and auto-recovery fault response make it suitable as a standalone protected load switch-for example, enabling/disabling a peripheral rail while bucks power the main SoC.

What is the role of the V7V pin on the TPS65283-1RGER, and how must it be decoupled?

V7V is an internal 6.3 V LDO output powering the gate drivers and analog bias circuits. It must be decoupled to PGND with ≥1 µF ceramic capacitance placed as close as possible to the pin; TI recommends using a 2.2 µF X5R capacitor. Improper decoupling causes erratic high-side FET turn-on, increased R_DS(on), and potential thermal shutdown. The V7V rail also supplies the bootstrap circuit-so its stability directly impacts LX node swing and converter efficiency.

Does the TPS65283-1RGER support external clock synchronization, and how is it configured?

Yes-the ROSC/SYNC pin (Pin 4) supports both resistor-programmed frequency (200 kHz–2 MHz) and external clock synchronization. To enable sync, apply a clean CMOS clock signal (200–2000 kHz, V_HI ≥2 V, V_LO ≤0.4 V) directly to ROSC/SYNC while leaving the ROSC resistor unconnected. The device automatically detects the external clock and locks phase-reducing beat frequencies and EMI in multi-rail systems like wireless routers with co-located RF and baseband power domains.