Texas Instruments LP3907TLX-JJ11/NOPB

Overview

LP3907TLX-JJ11/NOPB from Texas Instruments is a programmable power management IC integrating two synchronous buck converters (1 A @ 1.2 V, 600 mA @ 1.8 V) and two 300-mA LDOs (2.85 V each), all controlled via 400-kHz I²C interface. It features auto-mode switching (PWM-to-PFM), ±3% output voltage accuracy, 2.1-MHz switching frequency, and thermal/overcurrent protection - deployed in FPGA core and I/O power rails where dynamic voltage scaling and sequencing are required.

For engineers reviewing the LP3907TLX-JJ11/NOPB datasheet, LP3907TLX-JJ11/NOPB pinout, LP3907TLX-JJ11/NOPB application, or LP3907TLX-JJ11/NOPB equivalent, key selection criteria include verified I²C address (0x3C for WQFN), confirmed JJ11 default configuration (Buck1=1.2 V, Buck2=1.8 V, LDO1=LDO2=2.85 V, Auto-Mode, EN_T delay=010), and WQFN-24 package thermal metrics (RθJA = 32.7°C/W).

Technical Context

The LP3907TLX-JJ11/NOPB implements dual synchronous buck regulators with integrated high-side/low-side MOSFETs (RDSON_P = 200 mΩ, RDSON_N = 180 mΩ), supporting forced PWM or automatic PWM-to-PFM mode transition under light load to sustain >94% efficiency at 10 mA. Its I²C interface operates at 400 kHz with defined timing (tDATASU = 100 ns, tCLKHP = 0.6 µs) and supports register-level control of voltage, enable sequencing, and power-good assertion.

Two PMOS-based LDOs deliver 300-mA output with 30-mV typical dropout and 45-dB PSRR at 10 kHz; both are programmable from 1 V to 3.5 V except for JJ11 variants, which fix LDO1/LDO2 at 2.85 V. The device includes dedicated nPOR open-drain output with 50-ms default delay, UVLO (2.7–2.9 V), and thermal shutdown (160°C, 20°C hysteresis) for system-level fault handling.

Key Specifications

Pinout & Package

LP3907TLX-JJ11/NOPB is packaged in a 4.00 mm × 4.00 mm, 24-pin WQFN (RTW) with exposed thermal pad (DAP). The package supports high-power dissipation (PD_MAX = 1.43 W at TA = 85°C) 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, LP3907TLX-JJ11/NOPB uniquely combines fixed 1.2-V/1.8-V bucks with matched 2.85-V LDOs, WQFN-24 thermal performance, and I²C-configurable sequencing - making it optimal for space-constrained, battery-aware FPGA and DSP platforms requiring precise voltage alignment and minimal external components.

Availability

LP3907TLX-JJ11/NOPB is available at Aetrix Electronics and suitable for FPGA core power, hearing aid DSP subsystems, and electronic measurement units requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for LP3907TLX-JJ11/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-efficiency DC/DC conversion and low-noise regulation.

The LP3907 product line targets low-power portable electronics - specifically FPGAs, DSPs, and microprocessors - where integration of multiple regulated rails, I²C configurability, and dynamic voltage scaling reduce system complexity and extend battery life.

FAQ

What is the default I²C address for LP3907TLX-JJ11/NOPB?

The LP3907TLX-JJ11/NOPB uses a fixed 7-bit I²C address of 0x3C (5C hex) when packaged in the WQFN-24 (RTW) variant. This address is factory-set and cannot be altered; it differs from the DSBGA variant's default address (0x3D). Communication requires standard-mode 400-kHz timing compliance, including tDATASU ≥100 ns and tCLKHP ≥0.6 µs, as specified in Section 7.10 of the datasheet.

Does LP3907TLX-JJ11/NOPB support dynamic voltage scaling (DVS)?

Yes, LP3907TLX-JJ11/NOPB supports full dynamic voltage scaling via its I²C interface: Buck1 and Buck2 output voltages can be reprogrammed in real time across their respective ranges (Buck1: 0.8–2.0 V; Buck2: 1.0–3.5 V), subject to hardware limits. The JJ11 option fixes initial values at 1.2 V and 1.8 V, but DVS remains fully functional - enabling adaptive power management for processors with variable performance states.

What is the purpose of the nPOR pin on LP3907TLX-JJ11/NOPB?

The nPOR pin on LP3907TLX-JJ11/NOPB is an open-drain power-good signal that asserts LOW until both Buck1 and Buck2 outputs reach ≥94% of their target voltages and remain stable for the configured delay (50 ms for JJ11). It synchronizes host processor reset release and eliminates need for external supervisors - directly interfacing with FPGA or MCU reset inputs requiring active-low assertion.

Can LP3907TLX-JJ11/NOPB operate with input voltage below 2.8 V?

No - LP3907TLX-JJ11/NOPB has a hard minimum input voltage of 2.8 V for its main power inputs (VIN1, VIN2, VINLDO12), as specified in Section 7.3. However, the LDO input pins (VINLDO1/VINLDO2) support down to 1.74 V, allowing them to be powered from a downstream buck output (e.g., Buck1's 1.2 V cannot feed LDO1, but Buck2's 1.8 V can if LDO1 is set ≤1.74 V - though JJ11 fixes LDO1 at 2.85 V, so this is not applicable).

What thermal considerations apply to LP3907TLX-JJ11/NOPB in WQFN package?

LP3907TLX-JJ11/NOPB in WQFN-24 (RTW) has RθJA = 32.7°C/W and requires the DAP thermal pad to be soldered to a solid PCB ground plane for effective heat dissipation. At maximum 1.43-W power dissipation (TA = 85°C), junction temperature reaches ~132°C - within safe margin below 150°C absolute max. Layout must minimize copper resistance under DAP and avoid thermal vias beneath sensitive analog pins (FB1/FB2, AVDD).