Texas Instruments TL751M05QKTTRQ1

Overview

TL751M05QKTTRQ1 from Texas Instruments is an automotive-grade 5-V low-dropout linear voltage regulator with enable input, designed for permanent battery-connected systems. It delivers up to 750 mA output current, maintains regulation with dropout voltage ≤0.65 V at full load, and integrates load-dump protection up to 60 V - enabling robust operation in vehicle infotainment power rails.

For engineers reviewing the TL751M05QKTTRQ1 datasheet, TL751M05QKTTRQ1 pinout, TL751M05QKTTRQ1 application, or TL751M05QKTTRQ1 equivalent, key selection criteria include its AEC-Q100 qualification, TTL/CMOS-compatible ENABLE control, thermal shutdown behavior, and TO-263-5 (KTT) package thermal performance under –40°C to 125°C junction temperature operation.

Technical Context

The TL751M05QKTTRQ1 implements a bandgap-referenced error amplifier driving a PNP pass transistor, with internal current limiting, overvoltage protection, and thermal shutdown circuitry. Its ENABLE input directly controls output stage biasing, placing the output in high-impedance state when disabled - supporting sequential power-up in multi-rail automotive ECUs.

It operates across 6 V to 26 V input range, sustains 750 mA continuous output, and features 55 dB PSRR at 120 Hz. Load-dump immunity (60 V transient), reverse-battery tolerance (–50 V, 100 ms), and virtual junction temperature monitoring up to 150°C define its automotive safety envelope.

Key Specifications

Pinout & Package

TL751M05QKTTRQ1 uses the TO-263-5 (KTT) thermally enhanced surface-mount package with exposed thermal pad. The 5-pin layout supports high-current capability and efficient PCB heat dissipation via the backside metal tab, which is electrically connected to COMMON.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV70715PDPWRQ1 and TPS7B8750QKVURQ1, TL751M05QKTTRQ1 uniquely combines AEC-Q100 Grade 1 qualification, integrated 60 V load-dump protection, and 750 mA output in a single TO-263-5 package - reducing component count and validation effort for cost-sensitive automotive power rails.

Availability

TL751M05QKTTRQ1 is available at Aetrix Electronics and suitable for automotive infotainment systems, body control modules, and ADAS sensor hubs requiring stable component supply, long-lifecycle support, and AEC-Q100-compliant sourcing.

Supply support for TL751M05QKTTRQ1 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 automotive ICs, with decades of automotive qualification expertise and broad manufacturing scale.

The TL751Mxx-Q1 series belongs to TI's automotive LDO portfolio, engineered specifically for permanent-battery-connected vehicle subsystems demanding high transient immunity, low quiescent current, and guaranteed operation across –40°C to 125°C.

FAQ

What is the maximum input voltage the TL751M05QKTTRQ1 can withstand during load-dump events?

The TL751M05QKTTRQ1 is rated for 60 V transient input voltage per ISO 7637-2 Pulse 5a, verified under defined test conditions. This capability is built-in and does not require external components. During such events, the device remains functional and protects downstream circuitry. The TL751M05QKTTRQ1 maintains safe operation without latch-up or parametric shift when exposed to 60 V for the specified duration.

Does the TL751M05QKTTRQ1 require an external capacitor on the ENABLE pin?

No, the TL751M05QKTTRQ1 does not require an external capacitor on the ENABLE pin. Its ENABLE input is internally buffered and compatible with standard TTL and CMOS logic levels. The TL751M05QKTTRQ1 responds to enable/disable transitions within 50 µs and exhibits no oscillation or metastability - making it suitable for direct connection to microcontroller GPIOs without additional filtering.

What is the recommended output capacitor for stable operation of the TL751M05QKTTRQ1?

The TL751M05QKTTRQ1 requires a minimum 10 µF tantalum output capacitor with ESR between 0.13 Ω and 2 Ω for stable operation across all load and temperature conditions. Ceramic capacitors may be used only if series resistance is added to emulate the required ESR range. The TL751M05QKTTRQ1 datasheet provides ESR vs. load-current guidance in Figure 2 to ensure optimal transient response and phase margin.

Can the TL751M05QKTTRQ1 be used in reverse-battery fault conditions?

Yes, the TL751M05QKTTRQ1 is designed to survive reverse-battery conditions up to –50 V for 100 ms, as specified in its absolute maximum ratings. This protection is internal and does not rely on external diodes or MOSFETs. The TL751M05QKTTRQ1 remains undamaged and resumes normal operation after the fault clears, making it suitable for service environments where battery polarity reversal may occur.

What thermal performance can be expected from the TL751M05QKTTRQ1 in a standard 4-layer PCB layout?

In a JEDEC-standard high-K PCB layout with 2 oz copper and adequate thermal vias to inner ground planes, the TL751M05QKTTRQ1 achieves θJA = 26.5°C/W in its TO-263-5 (KTT) package. At 750 mA load and 25°C ambient, this yields ~20°C junction rise - well within its –40°C to 125°C operating range. The TL751M05QKTTRQ1 thermal pad must be soldered to ≥4 cm² copper area for this performance.