STMicroelectronics E-L6925D013TR

Overview

L6925D013TR from STMicroelectronics is a monolithic synchronous step-down DC-DC regulator designed for single Li-ion battery-powered systems. It delivers up to 800mA output current with adjustable output voltage from 0.6V, supports 100% duty cycle for low-dropout operation, and achieves up to 95% efficiency at 3.6V input and 1.8V output in typical applications such as cellular phones and PDAs.

For engineers reviewing the L6925D013TR datasheet, L6925D013TR pinout, L6925D013TR application, or L6925D013TR equivalent, key selection criteria include its 600kHz fixed-frequency current-mode control, externally synchronizable clock (500–1400kHz), selectable low-noise/low-consumption mode, ±1% output voltage accuracy, and integrated overvoltage and short-circuit protection.

Technical Context

The L6925D013TR implements a current-mode PWM controller with internal high-side (240mΩ) and low-side (215mΩ) MOSFETs, enabling synchronous rectification without external Schottky diodes. Its UVLO is set at 2.8V turn-on / 2.65V turn-off with 150mV hysteresis, optimized for single-cell Li-ion (2.7–5.5V) operation.

Feedback is referenced to a precise 0.6V internal bandgap (±1% over temperature), and the SYNC pin serves dual function: selecting low-noise mode (SYNC = 0V) or low-consumption mode (SYNC = VCC), or accepting an external clock for EMI-sensitive designs. The LBI/LBO pins provide programmable battery-low detection with open-drain LBO output.

Key Specifications

Pinout & Package

Package: MSOP8 (3mm × 3mm body, 0.65mm pitch), RoHS-compliant, rated for −40°C to +150°C junction temperature.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS62231DRVR and ADP2301ARMZ-R7, the L6925D013TR uniquely combines adjustable output, dual-mode operation, battery monitoring, and full synchronization-making it optimal for feature-rich, battery-life-critical portable systems requiring design flexibility.

Availability

L6925D013TR is available at Aetrix Electronics and suitable for cellular phones, portable instruments, and GPS receivers requiring stable component supply across extended production lifecycles.

Supply support for L6925D013TR 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 microcontrollers, power management ICs, sensors, and analog devices for industrial, automotive, and consumer markets.

The L6925D belongs to ST's high-efficiency DC-DC converter product line, engineered specifically for battery-powered portable equipment demanding minimal quiescent current, wide input range, and integrated protection features.

FAQ

What is the minimum recommended inductor value for stable operation?

The datasheet specifies a 6.8µH inductor in the reference design (Figure 2). With 600kHz switching frequency and 800mA max output, this value ensures peak-to-peak inductor ripple current remains within 30% of IOUT, maintaining current-mode stability and minimizing output voltage ripple under all load conditions.

How is the low-battery threshold programmed using the LBI pin?

The LBI pin compares applied voltage against an internal 0.6V reference. To set a custom threshold (e.g., 3.0V), connect a resistor divider from VCC to GND with LBI at the midpoint. For 3.0V threshold, use R1 = 400kΩ (VCC to LBI) and R2 = 100kΩ (LBI to GND), yielding V_LBI = V_CC × R2/(R1+R2) = 3.0V at turn-on.

Can the SYNC pin be left unconnected in standard operation?

No. The SYNC pin must be actively driven: tie to GND for low-noise mode, to VCC for low-consumption mode, or to an external clock source. Floating the pin causes undefined behavior and may result in erratic switching or failure to start. A 100kΩ pull-down is recommended if low-noise mode is intended but no external driver exists.

Does the L6925D013TR support ceramic output capacitors exclusively?

Yes. The device is optimized for low-ESR ceramic capacitors (e.g., 10µF X5R/X7R), as confirmed by the reference design (C1 and C4 both 10µF ceramic). Aluminum or tantalum capacitors introduce excessive ESR that destabilizes the current-mode loop and degrades transient response; their use is not supported per design validation.