Diodes Incorporated ZLDO270T8TA

Overview

ZLDO270T8TA from Diodes Incorporated is an ultra-low-dropout linear regulator delivering a fixed 2.70 V output with 300 mA maximum load current, 30 mV dropout at 100 mA, 1 mA typical quiescent current, and integrated low-battery flag (LBF) and active-high shutdown control - used in portable instrumentation power rails where input-to-output margin is constrained below 200 mV.

For engineers reviewing the ZLDO270T8TA datasheet, ZLDO270T8TA pinout, ZLDO270T8TA application, or ZLDO270T8TA equivalent, key selection criteria include dropout voltage vs. load, LBF activation threshold (Vo + 200 mV), shutdown leakage (<100 nA), thermal shutdown at 125°C, and SM8 package layout compatibility with high-density PCBs.

Technical Context

The ZLDO270T8TA employs a precision bandgap reference and error amplifier with external shaping capacitor (10 pF from Pin 8 to Pin 5) to achieve ±2.5% output tolerance and stable regulation across –40°C to +85°C. Its open-collector LBF output activates when Vin falls within 200 mV of Vo, providing early warning before dropout.

Shutdown control (Pin 2) is high-impedance (≤10 µA input current), with logic-high threshold ≥1.5 V and internal diode clamping to Vin; disabling reduces quiescent current to 11 µA typical while maintaining <100 nA output leakage under full input stress.

Key Specifications

Pinout & Package

The ZLDO270T8TA is housed in the Diodes Incorporated SM8 surface-mount package (8-pin small-outline), with exposed thermal pad not electrically connected. Pin 6 (D/C) must remain unconnected; Pin 4 (N/C) is internally floating and may be left open or tied to GND without impact.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-dropout regulator applications.

Compared with MCP1700T-2702E/TT and TLC7703IP, the ZLDO270T8TA uniquely combines sub-100 mV dropout at 100 mA, integrated LBF with open-collector drive, and 300 mA capability - making it the only choice for battery-powered systems needing both high-current regulation and predictive power-fail signaling.

Availability

ZLDO270T8TA is available at Aetrix Electronics and suitable for portable medical sensors, industrial handheld terminals, and wireless sensor node MCUs requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for ZLDO270T8TA 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

Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and connectivity applications.

The ZLDO series was designed specifically for space-constrained, battery-powered systems demanding ultra-low dropout, predictive low-battery detection, and robust thermal protection - targeting portable instrumentation and communications equipment.

FAQ

What is the minimum input voltage required for regulation at full 300 mA load?

The ZLDO270T8TA maintains regulation as long as Vin ≥ Vo + dropout voltage. At 300 mA, typical dropout is 100 mV, so minimum Vin = 2.70 V + 0.10 V = 2.80 V. The absolute minimum specified is Vo + 0.20 V (2.90 V) to guarantee regulation across temperature and process variation per datasheet Note 3.

Can the low battery flag (LBF) be used to drive a microcontroller GPIO directly?

Yes - Pin 1 (LBF) is an open-collector NPN output rated for 100 µA sink current. A 10 kΩ pull-up to 3.3 V yields ~0.33 V output when asserted, well within standard CMOS logic-low thresholds. No additional buffering is needed for direct interface to most 3.3 V or 5 V microcontrollers.

Is an input capacitor required for stable operation?

No - the ZLDO270T8TA does not require an input capacitor for stability, though one (e.g., 100 nF ceramic) is recommended to reduce high-frequency noise coupling from the source and dampen input transients caused by sudden load changes on shared rails.

How does the shutdown function affect output leakage current?

When disabled via Pin 2 (SC), the ZLDO270T8TA reduces output leakage to ≤100 nA (typical 50 nA) even with Vin = 20 V and Vout shorted to GND. This ensures minimal battery drain in storage or deep-sleep modes, critical for multi-year battery deployments in remote sensors.