Texas Instruments TPS7430D

Overview

TPS7430D from Texas Instruments is a 200-mA, 3.0-V fixed-output low-dropout (LDO) voltage regulator in an 8-pin SOIC package, featuring 170 mV typical dropout at 200 mA, ±3% output voltage tolerance over line/load/temperature, and fast transient response stable with 1-µF output capacitors. It delivers regulated power to noise-sensitive analog circuitry and low-voltage microcontrollers in space-constrained industrial control modules.

For engineers reviewing the TPS7430D datasheet, TPS7430D pinout, TPS7430D application, or TPS7430D equivalent, key selection criteria include dropout performance at full load, thermal shutdown behavior, enable input logic thresholds, quiescent current across temperature, and compatibility with low-ESR ceramic output capacitors.

Technical Context

The TPS7430D uses a PMOS pass transistor architecture enabling ultra-low dropout voltage and high PSRR (55 dB at 100 Hz). Its internal feedback loop is optimized for stability with minimal 1-µF ceramic output capacitance, eliminating need for bulk electrolytic capacitors.

It integrates TTL-compatible enable (EN) control, thermal shutdown at 150°C, and current limiting (~500 mA), with SENSE terminal supporting remote sensing for improved regulation accuracy at point-of-load. Quiescent current scales linearly with load-1.3 mA at 200 mA, <1 µA in shutdown.

Key Specifications

Pinout & Package

TPS7430D is housed in an 8-pin SOIC (D) package per JEDEC MS-012, 1.75 mm max height, RoHS-compliant NIPDAU finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7430D, TPS76330DBVR offers lower quiescent current but sacrifices dropout performance and remote sensing capability, while MCP1703T-3002E/MB provides microamp-level standby at the cost of regulation robustness and protection features-making TPS7430D optimal for dynamic, thermally demanding 3.0-V applications requiring precision and reliability.

Availability

TPS7430D is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics equipment, and automotive body electronics requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for TPS7430D 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 over 50 years of innovation in high-reliability components.

The TPS74xx family was designed specifically for space-constrained, noise-sensitive applications needing fast transient response and minimal external components-targeting industrial control, portable instrumentation, and automotive subsystems.

FAQ

What is the maximum input voltage rating for the TPS7430D?

The absolute maximum input voltage for the TPS7430D is 8 V, but the recommended operating range is 4.0 V to 7.0 V. Exceeding 7 V may degrade long-term reliability or trigger overvoltage stress not covered by TI's standard warranty. For 3.0-V output, minimum input is calculated as VO(max) + VDO(max) = 3.09 V + 0.35 V = 3.44 V; thus 4.0 V ensures margin across temperature and load. The TPS7430D must never be operated outside its specified VI range to maintain guaranteed performance and lifetime.

Does the TPS7430D require an external input capacitor?

The TPS7430D does not require an input capacitor for basic stability, but TI recommends a 1-µF ceramic bypass capacitor placed close to the IN pins when the device is located more than a few inches from the power source. This improves high-frequency noise rejection and load transient response. The TPS7430D's dual IN pins (pins 4 and 5) are designed to accommodate low-impedance routing; adding an input capacitor becomes essential in noisy environments such as motor drive or switching converter proximity. No minimum input capacitance is specified in the TPS7430D datasheet, unlike many older LDOs.

How does the SENSE pin function in the TPS7430D, and what happens if it's left unconnected?

The SENSE pin (pin 8) in the TPS7430D provides high-impedance feedback to the internal error amplifier, allowing remote sensing of the output voltage at the load instead of at the regulator's OUT pin. If left unconnected, the TPS7430D defaults to local sensing and still regulates-but output accuracy degrades due to PCB trace IR drop, especially under high load. TI explicitly states that SENSE must be connected to OUT for proper functioning; floating SENSE may cause instability or oscillation. For optimal 3.0-V regulation accuracy, route SENSE directly to the load's 3.0-V rail using a dedicated trace, separate from the main power path.

What is the thermal shutdown behavior of the TPS7430D, and does it auto-recover?

The TPS7430D activates thermal shutdown at approximately 150°C junction temperature and automatically resumes regulation once the die cools to ~130°C. This hysteresis prevents rapid on/off cycling near the trip point. During shutdown, the TPS7430D disables the pass transistor and draws <1 µA quiescent current. Recovery is fully autonomous-no external reset or enable toggling is required. However, repeated thermal cycling indicates inadequate heatsinking or excessive power dissipation; for continuous 200-mA operation at 70°C ambient, the SOIC package requires airflow or copper pour to stay within 125°C max operating junction temperature.

Can the TPS7430D be used with a 1-µF ceramic output capacitor, and what ESR is required?

Yes, the TPS7430D is explicitly characterized and guaranteed stable with a 1-µF ceramic output capacitor, provided its equivalent series resistance (ESR) is ≥300 mΩ. Solid tantalum and aluminum electrolytic capacitors are also acceptable if they meet this ESR requirement. TI warns against using ultra-low-ESR ceramics (<100 mΩ) without series resistance, as this can induce oscillation. The TPS7430D's control loop is optimized for this low-capacitance, moderate-ESR condition-enabling smaller PCB footprints and lower BOM cost compared to legacy LDOs requiring 10–22 µF outputs.