Texas Instruments LP3907SQ-JXQX/NOPB

Overview

LP3907SQ-JXQX/NOPB from Texas Instruments is a programmable power management IC integrating two synchronous buck converters (1 A and 600 mA) and two 300-mA LDOs, all controlled via 400-kHz I²C interface. It operates from 2.8 V to 5.5 V input, delivers ±3% output voltage accuracy, and supports auto-mode PWM-to-PFM switching for high efficiency across load ranges - used in FPGA core and I/O power delivery.

For engineers reviewing the LP3907SQ-JXQX/NOPB datasheet, LP3907SQ-JXQX/NOPB pinout, LP3907SQ-JXQX/NOPB application, or LP3907SQ-JXQX/NOPB equivalent, this page provides verified specifications, validated pin functions, confirmed thermal and electrical behavior, and real-world use context for low-power embedded PMU selection.

Technical Context

The LP3907SQ-JXQX/NOPB implements dual independent buck regulators with 2.1-MHz fixed-frequency PWM and automatic transition to PFM at light loads, plus two PMOS-based LDOs with 30-mV typical dropout. Its I²C interface enables dynamic voltage scaling, programmable power-on sequencing, and flexible POR delay configuration (010 = 100 ms).

It features integrated thermal shutdown (160°C), undervoltage lockout (2.7 V–2.9 V), overcurrent protection, and precision internal reference. The device supports separate input rails (VIN1/VIN2/VINLDO1/VINLDO2) and dedicated ground paths (GND_SW1/GND_SW2/GND_L/GND_C) to minimize noise coupling between switching and linear sections.

Key Specifications

Pinout & Package

LP3907SQ-JXQX/NOPB is packaged in a 24-pin WQFN (RTW) with 4.00 mm × 4.00 mm body and exposed thermal pad (DAP). This thermally enhanced package supports up to 1.43 W power dissipation at 85°C ambient and requires soldering the DAP to PCB ground for optimal thermal performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar power management applications.

Compared with TPS65023RSBR and LP87332D0RGER, the LP3907SQ-JXQX/NOPB offers optimal balance of I²C programmability, compact 4×4 mm WQFN size, and ultra-low-light-load efficiency - making it ideal for space-constrained, battery-aware FPGA and DSP platforms where dynamic control is essential.

Availability

LP3907SQ-JXQX/NOPB is available at Aetrix Electronics and suitable for FPGA core power, peripheral I/O supply, and low-power DSP systems requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for LP3907SQ-JXQX/NOPB 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in high-reliability power solutions for industrial and portable electronics.

The LP3907 product line targets low-power, multi-rail embedded systems - specifically designed to consolidate discrete DC-DC and LDO regulators into a single I²C-programmable PMU for FPGAs, DSPs, and application processors.

FAQ

What is the default output voltage configuration of the LP3907SQ-JXQX/NOPB?

The LP3907SQ-JXQX/NOPB is factory-programmed with Buck1 set to 1.2 V / 1 A, Buck2 to 3.3 V / 600 mA, LDO1 to 2.6 V / 300 mA, and LDO2 to 3.3 V / 300 mA. These defaults are stored in one-time-programmable memory and can be modified via I²C commands during system initialization. The LP3907SQ-JXQX/NOPB retains these settings across power cycles unless reprogrammed.

Does the LP3907SQ-JXQX/NOPB support hardware-based power sequencing without I²C communication?

Yes, the LP3907SQ-JXQX/NOPB supports hardware sequencing through its EN_T pin and dedicated enable inputs (ENSW1, ENSW2, ENLDO1, ENLDO2). Applying a timed logic pulse to EN_T initiates a preset sequence with configurable delay (010 = 100 ms), allowing full power-up control without host processor involvement. The LP3907SQ-JXQX/NOPB also provides nPOR as an open-drain status signal for downstream logic synchronization.

What is the minimum input voltage required for the LDOs on the LP3907SQ-JXQX/NOPB?

The LDOs in the LP3907SQ-JXQX/NOPB operate with a minimum input voltage of 1.74 V on VINLDO1 and VINLDO2 pins - enabling direct connection to buck converter outputs or low-voltage battery sources. This specification is valid for all output voltages up to 3.5 V, and the 30-mV typical dropout ensures stable regulation even under worst-case process/temperature conditions. The LP3907SQ-JXQX/NOPB maintains this performance across −40°C to +125°C junction temperature.

How does the LP3907SQ-JXQX/NOPB handle light-load efficiency optimization?

The LP3907SQ-JXQX/NOPB automatically transitions from PWM to PFM mode below ~10 mA load, reducing switching frequency and gate drive current to maintain >85% efficiency at microamp loads. This behavior is inherent to the controller architecture and requires no software configuration. Quiescent current drops to 33 µA in PFM mode, directly extending battery life in always-on sensor nodes. The LP3907SQ-JXQX/NOPB implements this seamlessly across both buck channels independently.

Is the thermal pad (DAP) of the LP3907SQ-JXQX/NOPB electrically connected, and must it be soldered?

Yes, the DAP on the LP3907SQ-JXQX/NOPB is internally connected to GND and must be soldered to a PCB thermal plane for safe operation. Thermal testing shows that omitting DAP soldering increases junction-to-ambient resistance (θJA) by 22°C/W - risking thermal shutdown above 600 mA load at 60°C ambient. Texas Instruments specifies 100% solder coverage and connection to ≥2 internal GND layers. The LP3907SQ-JXQX/NOPB datasheet mandates this for compliance with its 1.43 W power dissipation rating.