Texas Instruments LP5907QMFX-4.5Q1

Overview

LP5907QMFX-4.5Q1 from Texas Instruments is an AEC-Q100 Grade 1 automotive LDO regulator delivering 250 mA output at fixed 4.5 V, with ultra-low 6.5 µV_RMS noise, 82 dB PSRR at 1 kHz, and 12 µA quiescent current - designed for RF-sensitive power rails in ADAS cameras and radar modules.

For engineers reviewing the LP5907QMFX-4.5Q1 datasheet, LP5907QMFX-4.5Q1 pinout, LP5907QMFX-4.5Q1 application, or LP5907QMFX-4.5Q1 equivalent, this page delivers verified package mapping (SOT-23-5), confirmed thermal specs (R_θJA = 186.9°C/W), exact enable threshold (V_IH = 1.2 V), dropout voltage (120 mV typ. @ 250 mA), and remote capacitor placement capability up to 10 cm.

Technical Context

The LP5907QMFX-4.5Q1 employs a low-noise bandgap reference with integrated RC filtering (–3 dB at ~0.1 Hz) to achieve <6.5 µV_RMS output noise without external bypass capacitors. Its internal 1-MΩ EN pulldown ensures default disable state, while the 230-Ω output pulldown discharges V_OUT during shutdown.

It operates across –40°C to 125°C junction temperature with thermal shutdown at 160°C and hysteresis of 15°C. Stability is guaranteed with ≥1-µF ceramic input and output capacitors (ESR 5–500 mΩ), supporting remote C_OUT placement up to 10 cm from the package.

Key Specifications

Pinout & Package

SOT-23-5 package (2.90 mm × 1.60 mm); thermally enhanced for automotive under-hood operation. Pin 4 is N/C (no internal connection).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLD1124-1QV and TPS7A2045PDBVR, the LP5907QMFX-4.5Q1 uniquely combines AEC-Q100 Grade 1 qualification, 250 mA capability, and RF-grade noise performance in a thermally optimized SOT-23-5 package - making it the only validated option for safety-critical ADAS sensor power rails.

Availability

LP5907QMFX-4.5Q1 is available at Aetrix Electronics and suitable for ADAS camera modules, automotive radar systems, and telematics control units requiring stable component supply with full automotive qualification and traceable lot history.

Supply support for LP5907QMFX-4.5Q1 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 company specializing in analog and embedded processing technologies, with leadership in automotive-grade power management ICs.

The LP5907-Q1 product line was engineered specifically for ultra-low-noise, low-I_Q power delivery in RF-intensive automotive subsystems - targeting ADAS, infotainment, and vehicle connectivity applications demanding AEC-Q100 reliability.

FAQ

What is the maximum ambient temperature for continuous operation of the LP5907QMFX-4.5Q1?

The LP5907QMFX-4.5Q1 supports continuous operation up to +125°C junction temperature. With R_θJA = 186.9°C/W in SOT-23-5, the maximum allowable ambient temperature depends on power dissipation: for example, at 250 mA load with 4.8 V input, PD ≈ 750 mW → TA-MAX ≈ 125°C − (186.9 × 0.75) ≈ −15°C. Board-level thermal design is essential to maintain safe junction temperatures in real-world automotive environments. The LP5907QMFX-4.5Q1 includes thermal shutdown at 160°C to prevent damage.

Does the LP5907QMFX-4.5Q1 require an external noise-bypass capacitor?

No, the LP5907QMFX-4.5Q1 does not require an external noise-bypass capacitor. Its internal low-pass RC filter (–3 dB at ~0.1 Hz) on the bandgap reference achieves <6.5 µV_RMS output noise over 10 Hz–100 kHz with only 1-µF input and output ceramic capacitors. This architecture eliminates the need for additional capacitors, reducing BOM count and PCB area - a key advantage confirmed in TI's SNVSA34E datasheet Section 7.3.3 and Figure 16.

Can the output capacitor be placed remotely from the LP5907QMFX-4.5Q1 package?

Yes, the LP5907QMFX-4.5Q1 supports remote placement of the 1-µF output capacitor up to 10 cm from the package, as verified in Section 7.3.5 of the datasheet. This capability is enabled by its stable compensation design and is particularly valuable in ADAS camera modules where the LDO may be mounted near the connector while the sensor sits under an optical lens assembly. Layout guidelines recommend minimizing trace inductance and using solid ground planes to preserve transient response.

What is the function of Pin 4 (N/C) on the LP5907QMFX-4.5Q1 SOT-23-5 package?

Pin 4 on the LP5907QMFX-4.5Q1 SOT-23-5 package is designated N/C (No Connection) - it has no internal electrical bond or function. Per TI's Pin Functions table (Section 5), this pin must remain unconnected in PCB layout and soldering. Routing traces to or placing solder on Pin 4 risks mechanical stress or unintended coupling; the LP5907QMFX-4.5Q1 relies solely on Pins 1 (IN), 2 (GND), 3 (EN), and 5 (OUT) for full operation.

How does the LP5907QMFX-4.5Q1 handle output discharge during shutdown?

When the EN pin is pulled low (<0.4 V), the LP5907QMFX-4.5Q1 activates an internal 230-Ω (typical) pulldown resistor between OUT and GND, actively discharging any residual charge on the output capacitor. This feature prevents floating or slowly decaying voltages that could cause latch-up or undefined states in downstream logic. The discharge behavior is specified in Section 6.5 (RAD parameter) and detailed in Section 7.3.4 of the datasheet - a critical requirement for automotive functional safety compliance.