STMicroelectronics L6932D1.2TR

Overview

L6932D1.2TR from STMicroelectronics is an adjustable ultra-low-dropout linear regulator delivering up to 2A output current with 1.2V to 5V programmable output, 200mΩ typical R_DS(on), 1% voltage accuracy, and operation from 2V to 14V input. It integrates enable control, power-good indication, short-circuit protection, and thermal shutdown-used in mobile PC I/O rails and chipset supply where low quiescent current (200µA) and tight regulation under load transients are critical.

For engineers reviewing the L6932D1.2TR datasheet, L6932D1.2TR pinout, L6932D1.2TR application, or L6932D1.2TR equivalent, key selection criteria include dropout performance at 2A, ADJ-pin voltage-divider configuration for 1.2V–5V setpoint, SO-8 (4+4) thermal resistance (62°C/W), and PGOOD open-drain behavior at 90% V_OUT threshold.

Technical Context

The L6932D1.2TR uses an internal 50mΩ N-channel MOSFET as the pass element, enabling ultra-low dropout operation down to (V_OUT + 200mV) at 2A. Its error amplifier compares the ADJ pin voltage against a 1.25V internal reference, supporting external resistor dividers for precise output programming.

It features dual protection: current limiting fixed at 2.5A ±8% via internal MOSFET current sensing, and thermal shutdown activating at 150°C with 20°C hysteresis. The open-drain PGOOD pin asserts low when output falls below 90% of the programmed value, enabling system-level power sequencing.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar adjustable LDO regulator applications.

Compared with TPS7A4700RGWR and ADM7172ACPZ-R7, the L6932D1.2TR uniquely combines 14V input tolerance, 2A output, and SO-8 thermal performance-making it optimal for mobile PC and industrial motherboard applications where wide VIN and robust thermal handling are non-negotiable.

Availability

L6932D1.2TR is available at Aetrix Electronics and suitable for mobile PC I/O supply, handheld instrument core rails, and PCMCIA card power management requiring stable component supply across extended temperature and long production lifecycles.

Supply support for L6932D1.2TR 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 portable and embedded systems demanding ultra-low dropout, high current, and integrated power-good signaling in space-constrained SO-8 packages.

FAQ

What is the minimum input voltage required for stable 1.2V output at 2A?

The L6932D1.2TR requires V_IN ≥ V_OUT + (I_OUT × R_DS(on)). With 200mΩ max R_DS(on) and 2A load, minimum V_IN = 1.2V + 0.4V = 1.6V-but datasheet specifies 2V absolute minimum for guaranteed operation across temperature and process variation. Below 2V, regulation and protection features may not function reliably.

How should the ADJ pin be configured for a 1.5V output?

Use the formula V_OUT = 1.25V × (1 + R1/R2). For 1.5V, select R2 = 3.3kΩ and R1 = 5.6kΩ (standard 1% values), yielding V_OUT = 1.25 × (1 + 5.6/3.3) ≈ 1.50V. Place a 1nF capacitor across R1 to stabilize the feedback loop when using ceramic output capacitors.

Does the PGOOD pin require an external pull-up resistor?

Yes-the PGOOD pin is open-drain and must be pulled up to a logic-compatible voltage (e.g., 3.3V or V_OUT) with a 10kΩ resistor. Without pull-up, the pin remains floating and cannot assert a valid logic-high state during normal operation or indicate fault conditions reliably.

Can the L6932D1.2TR replace fixed-output variants like L6932D1.5TR on the same PCB?

No-pinout differs: L6932D1.2TR uses Pin 3 as ADJ, while fixed versions route V_OUT to Pin 3. Swapping requires redesigning the feedback network and verifying layout clearance for the ADJ trace. Fixed versions lack ADJ functionality and cannot be reconfigured, so direct substitution violates electrical and mechanical compatibility.