Texas Instruments REG711EA-2.5/250

Overview

REG711EA-2.5/250 from Texas Instruments is a 50mA switched-capacitor DC/DC converter delivering a regulated 2.5V output with ±0.12V tolerance over 1.8V–5.5V input, automatic buck/boost mode switching, and 1MHz internal oscillator. It operates in smart card readers and SIM card supplies where low EMI, no-inductor design, and ultra-low shutdown current (<2µA) are critical.

For engineers reviewing the REG711EA-2.5/250 datasheet, REG711EA-2.5/250 pinout, REG711EA-2.5/250 application, or REG711EA-2.5/250 equivalent, key selection criteria include input voltage range compatibility (1.8V–5.5V), 2.5V output accuracy at 50mA load, MSOP-8 thermal resistance (150°C/W), and enable-controlled shutdown behavior.

Technical Context

The REG711EA-2.5/250 implements automatic mode switching between step-down (buck) and step-up (boost) operation based on input voltage relative to output-transitioning at VIN ≈ 3.2V. Its charge-pump architecture uses internal FETs (Q1–Q4) and a 50% duty-cycle 1MHz oscillator to regulate via cycle-skipping, eliminating inductors while maintaining low output ripple (40mVp-p at 50mA).

It integrates thermal shutdown (trip at 160°C, recover at 140°C), current limiting (80mA short-circuit), and precision enable control (logic-high threshold ≥1.3V, leakage <100nA). Quiescent current is 60µA at no load and drops to ≤2µA in shutdown, enabling battery-sensitive portable systems.

Key Specifications

Pinout & Package

REG711EA-2.5/250 is housed in an 8-pin VSSOP (DGK) package-identical to MSOP-8-with 0.65mm pitch, 3.0mm × 3.0mm body, and <1.1mm height. Thermal resistance θ_JA is 150°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar switched-capacitor DC/DC converter applications.

Compared with MAX881RESA+ and TPS60403DBVR, REG711EA-2.5/250 uniquely combines enable-controlled shutdown (<2µA), separated PGND/GND for low-noise layout, and guaranteed 40mVp-p ripple-making it optimal for battery-powered smart peripherals demanding both efficiency and signal integrity.

Availability

REG711EA-2.5/250 is available at Aetrix Electronics and suitable for smart card readers, SIM card supplies, and portable communication devices requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.

Supply support for REG711EA-2.5/250 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, embedded processing, and digital signal technologies, with decades of expertise in power management innovation.

The REG711 family was designed specifically for low-power, no-inductor DC/DC conversion in space- and noise-sensitive portable electronics-emphasizing simplicity, reliability, and wide-input battery compatibility.

FAQ

What is the minimum input voltage required for REG711EA-2.5/250 to start regulation?

The REG711EA-2.5/250 guarantees startup and regulation down to 1.8V input across its full temperature range (–40°C to +85°C). This allows direct operation from partially discharged single-cell Li-ion or multi-cell alkaline batteries without brownout risk. The device maintains 2.5V output regulation even when VIN dips below VOUT, entering boost mode automatically.

Does REG11EA-2.5/250 require external compensation components?

No, REG711EA-2.5/250 is fully internally compensated and requires only three external ceramic capacitors: 2.2µF input (CIN), 2.2µF output (COUT), and 0.22µF pump (CPUMP). No resistors, feedback dividers, or compensation networks are needed-reducing BOM count and layout complexity while ensuring stability across all operating conditions.

How does REG711EA-2.5/250 handle input voltage transitions across the buck/boost threshold?

REG711EA-2.5/250 transitions smoothly between buck and boost modes at approximately VIN = 3.2V without output disturbance or control-loop instability. The internal control logic adjusts switching duty cycle and phase timing dynamically, maintaining continuous regulation and sub-40mVp-p ripple during transitions-verified in line transient response tests with 50µs/div scope capture.

Can REG711EA-2.5/250 drive a 50mA load continuously at 85°C ambient?

Yes, REG711EA-2.5/250 supports 50mA continuous output at TA = +85°C when mounted on a standard 2-layer PCB with recommended layout (short traces, star ground, 1oz copper). Its thermal shutdown activates only above 160°C junction temperature, and θ_JA = 150°C/W ensures safe operation within derating limits-confirmed by maximum load vs. VIN curves in the datasheet.

What is the recommended capacitor dielectric for COUT in REG711EA-2.5/250 designs?

Texas Instruments specifies X7R or X5R ceramic dielectrics for COUT in REG711EA-2.5/250 applications. These materials provide stable capacitance over voltage and temperature, low ESR (<0.1Ω), and minimal microphonic effects-critical for achieving the rated 40mVp-p output ripple. Tantalum or aluminum electrolytic capacitors are explicitly discouraged due to higher ESR and impedance rise at high frequencies.