STMicroelectronics L6932D1.5TR

Overview

L6932D1.5TR from STMicroelectronics is a 2A ultra-low dropout linear regulator with fixed 1.5V output, 2V–14V input range, 200mΩ max R_DS(on), 1% voltage accuracy, and integrated enable and power-good functions. It delivers stable I/O supply for processors and chipsets in mobile PCs and handheld instruments where low quiescent current (200µA) and thermal robustness are critical.

For engineers reviewing the L6932D1.5TR datasheet, L6932D1.5TR pinout, L6932D1.5TR application, or L6932D1.5TR equivalent, this page provides verified technical context, SO-8 (4+4) package mapping, load/line regulation performance, thermal shutdown behavior, and real-world design implications for portable DC-DC conversion between 2.5V and 1.5V at 2A.

Technical Context

The L6932D1.5TR uses an internal 50mΩ N-channel MOSFET to achieve ultra-low dropout operation, enabling efficient 2.5V-to-1.5V conversion at 2A while limiting power dissipation. Its error amplifier references a 1.25V internal bandgap and drives the pass transistor via a charge pump, supporting tight regulation across temperature and load.

It integrates dual protection: current limiting at 2.5A ±8% (sensed directly across the MOSFET), and thermal shutdown at 150°C with 20°C hysteresis. The open-drain PGOOD pin asserts low when V_OUT drops below 90% of nominal, and EN enables operation when pulled high to VIN.

Key Specifications

Pinout & Package

Package: SO-8 (4+4), surface-mount, 1.27mm pitch, 5.0mm × 4.0mm body, 1.75mm max height per JEDEC MS-012. Thermal resistance junction-to-ambient is 62°C/W on demo board (4 cm² copper).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-output LDO regulator applications.

Compared with TSM1085CP and MCP1826T-1502E/DB, the L6932D1.5TR uniquely combines 2A capability, PGOOD, EN, and 200µA quiescent current in SO-8 - making it optimal for sequenced, battery-sensitive mobile platforms where reliability and feature integration outweigh marginal cost differences.

Availability

L6932D1.5TR is available at Aetrix Electronics and suitable for mobile PC motherboards, handheld instrument power management, and PCMCIA card supply requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for L6932D1.5TR 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, microcontroller, power, and sensor solutions for automotive, industrial, and consumer markets.

The L6932 series belongs to ST's high-performance linear regulator product line, engineered specifically for ultra-low-dropout, high-current I/O and memory supply in portable computing and embedded systems where thermal efficiency and sequencing control are essential.

FAQ

What is the minimum input voltage required for 1.5V output at 2A?

The L6932D1.5TR requires at least 1.9V input to maintain regulation at 2A, based on its 200mΩ max R_DS(on) (2A × 0.2Ω = 400mV dropout). Below 1.9V, output voltage collapses linearly. This is validated in the "Electrical Characteristics" table (p.3) and thermal analysis section (p.8), where dropout is explicitly derived from R_DS(on) and load current.

Does L6932D1.5TR require external capacitors, and what values are recommended?

Yes - a minimum 10µF ceramic or tantalum capacitor is required on both IN and OUT pins, as specified in the "Typical Operating Circuit" (p.2) and "Component Selection" section (p.6). Input capacitance ≥47µF improves transient response; output capacitance must have low ESR (<100mΩ) to ensure loop stability, especially with ceramic types where a 1–10nF compensation capacitor across the feedback divider may be needed.

How does the PGOOD pin behave during startup and fault conditions?

PGOOD is an open-drain output that remains high-impedance until V_OUT reaches ≥90% of 1.5V (i.e., ≥1.35V), then pulls low if V_OUT falls below that threshold. During startup, it transitions from high-Z to active-low only after regulation is established - confirmed by the "PGOOD threshold" spec (p.4) and block diagram showing error amplifier comparison against 0.9×V_REF.

Can L6932D1.5TR be used in adjustable mode by connecting ADJ?

No - L6932D1.5TR is a fixed-output variant; its ADJ pin is internally connected to the 1.25V reference and is not accessible for external feedback. Only the L6932D1.2, L6932DADJ, and related adjustable versions expose ADJ as a functional terminal. This is confirmed by the "PIN CONNECTIONS" table (p.2), which lists pin 3 as "ADJ – Connecting this pin…" only for the adjustable version, while fixed versions use pin 3 for PGOOD.