STMicroelectronics E-L6910

Overview

L6910 from STMicroelectronics is a voltage-mode PWM synchronous buck controller IC designed for high-efficiency, high-transient-response DC-DC conversion from 5V–12V input buses. It delivers adjustable output down to 0.9V ±1.5%, supports 0–100% duty cycle, integrates 1.3A high-side and 1.1A low-side gate drivers, and features hiccup-mode overcurrent protection and power-good signaling - used in memory supply rails and add-on card power stages.

For engineers reviewing the L6910 datasheet, L6910 pinout, L6910 application, or L6910 equivalent, key selection considerations include its 200kHz–1MHz externally adjustable oscillator, internal 0.9V reference with EAREF/VREF flexibility, PHASE-sensed R_DS(on)-based current limiting, and SO-16/HTSSOP16 package options with exposed thermal pad (L6910A).

Technical Context

The L6910 implements voltage-mode PWM control with a 10MHz gain-bandwidth error amplifier and 10V/µs slew rate, enabling fast load transient response without requiring external compensation for basic stability. Its oscillator allows precise frequency tuning via RT resistor to GND (up to 1MHz) or VCC (down to 50kHz), with fixed 200kHz default operation when OSC is open.

Protection architecture includes overvoltage detection via FB/EAREF monitoring (trip at 120% reference), crowbar action through LGATE activation, and adaptive hiccup-mode recovery triggered by OCSET-sensed upper MOSFET R_DS(on) voltage drop - eliminating need for discrete current-sense resistors.

Key Specifications

Pinout & Package

Available in SO-16 (narrow body) and thermally enhanced HTSSOP16 with exposed pad for improved junction-to-ambient thermal resistance (50°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck controller applications.

Compared with MP2307DN and LM5116, the L6910 uniquely combines voltage-mode precision, R_DS(on)-based protection, and 0.9V ±1.5% internal reference in a single SO-16/HTSSOP16 package - making it optimal for memory and add-on card supplies where accuracy, transient response, and integration are prioritized over ultra-wide VIN or lowest cost.

Availability

L6910 is available at Aetrix Electronics and suitable for memory supply rails, computer add-on cards, and low-voltage distributed DC-DC systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for L6910 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 specializing in power management, analog, and microcontroller solutions for automotive, industrial, and computing markets.

The L6910 belongs to ST's high-performance DC-DC controller product line, engineered specifically for synchronous buck topologies in memory and peripheral power applications demanding precision regulation and fast transient immunity.

FAQ

What is the minimum output voltage achievable with the L6910?

The L6910 achieves a minimum regulated output voltage of 0.9V ±1.5% when using its internal reference (EAREF tied to VREF). This specification is guaranteed across temperature and load conditions per Table 5. External references down to 0.9V may be used, but the device shuts down if EAREF falls below 650mV - ensuring reliable low-voltage operation without undervoltage lockout issues.

How does the L6910 implement overcurrent protection without a sense resistor?

The L6910 senses overcurrent by measuring the voltage drop across the upper MOSFET's R_DS(on) using the OCSET pin, which sinks a precise 200µA current. The resulting voltage (I_OCSET × R_DS(on)) is compared against an internal threshold. This eliminates the need for a discrete current-sense resistor, reducing power loss, board area, and cost while maintaining accurate trip points across temperature.

Can the L6910 operate with 100% duty cycle, and what is its significance?

Yes, the L6910 supports 0% to 100% duty cycle operation - confirmed in Section 1 FEATURES and Section 4 DEVICE DESCRIPTION. This enables full input-to-output pass-through during light loads or low-VIN conditions, improves efficiency at light loads, and supports seamless power sequencing in systems requiring zero-dropout behavior during brown-out recovery.

What thermal considerations apply to the HTSSOP16 package (L6910A)?

The L6910A in HTSSOP16 has a junction-to-ambient thermal resistance of 50°C/W when soldered on a 1-layer PCB with exposed pad (Table 3). To maintain T_J ≤ 125°C at full load, the PCB must provide adequate copper area under the exposed pad and minimize ambient temperature rise. Unlike SO-16 (120°C/W), HTSSOP16 enables higher continuous output current in space-constrained applications.