Texas Instruments TPS76533DRG4

Overview

TPS76533DRG4 from Texas Instruments is a 3.3-V fixed-output, 150-mA ultra-low-quiescent-current LDO voltage regulator featuring PMOS pass element, 140-mV typical dropout at 150 mA, 35-µA typical ground current, and open-drain power-good (PG) output - designed for battery-powered portable electronics requiring extended runtime and precise power sequencing.

For engineers reviewing the TPS76533DRG4 datasheet, TPS76533DRG4 pinout, TPS76533DRG4 application, or TPS76533DRG4 equivalent, key selection criteria include dropout performance under load, thermal shutdown behavior at 150°C, PG trip threshold (92–98% VO), stability with 4.7-µF output capacitor, and enable-controlled sleep mode reducing quiescent current to <1 µA.

Technical Context

The TPS76533DRG4 employs a voltage-driven PMOS pass transistor, enabling quiescent current independent of output load (35 µA typ. from 0 to 150 mA) and eliminating base-current-related inefficiencies seen in PNP-based LDOs. Its control loop is optimized for stability with low-ESR capacitors (300 mΩ–20 Ω) and minimum 4.7-µF output capacitance.

Power-good monitoring uses an internal comparator with hysteresis (0.5% VO) that asserts low when VO drops below 92–98% of nominal; the open-drain PG output requires external pull-up. Enable logic accepts TTL-compatible inputs (VIH ≥ 2.0 V, VIL ≤ 0.8 V) and achieves full regulation recovery in ~160 µs after EN assertion.

Key Specifications

Pinout & Package

TPS76533DRG4 is housed in an 8-pin SOIC (D) package with exposed pad not present; footprint matches standard SOIC-8 (5.3 mm × 6.2 mm, 1.27 mm pitch). Pin 1 is NC/FB (no-connect for fixed-output version); pins 5 and 6 are paralleled IN inputs; pins 7 and 8 are paralleled OUT outputs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS76533D, the TPS76533DRG4 offers identical performance in tape-and-reel format for automated manufacturing; versus MCP1700T-3302E/MB, it trades slightly higher quiescent current for critical system-level features - PG monitoring, enable control, dual IN/OUT pins, and lower dropout - essential for robust embedded power management.

Availability

TPS76533DRG4 is available at Aetrix Electronics and suitable for portable medical sensors, low-power IoT end nodes, and industrial process monitors requiring stable component supply with long-term lifecycle support and consistent parametric performance.

Supply support for TPS76533DRG4 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.

The TPS765xx family was engineered specifically for ultra-low-power battery-operated systems demanding high efficiency across wide load and temperature ranges - emphasizing quiescent current minimization, dropout reduction, and integrated power supervision.

FAQ

What is the minimum input voltage required for TPS76533DRG4 to deliver 150 mA at 3.3 V?

The minimum input voltage is calculated as VO + VDO(max) = 3.3 V + 0.24 V = 3.54 V. However, per datasheet recommended operating conditions, VI must be ≥ VO + 1 V = 4.3 V for guaranteed 150-mA operation across temperature. Below 4.3 V, current capability degrades progressively as dropout margin shrinks. The TPS76533DRG4 remains functional down to 2.7 V input but cannot sustain full load.

Can TPS76533DRG4 operate without an output capacitor?

No. The TPS76533DRG4 requires a minimum 4.7-µF output capacitor with ESR between 300 mΩ and 20 Ω for closed-loop stability. Omitting CO causes oscillation and regulation failure. Ceramic, tantalum, or aluminum electrolytic types are acceptable if ESR limits are met. Zero-load operation is supported, but capacitor is mandatory.

How does the power-good (PG) output of TPS76533DRG4 behave during startup and brownout?

At startup, PG remains low until VO reaches ≥98% of 3.3 V (~3.23 V), then transitions high after internal delay. During brownout, PG pulls low when VO falls to ≤92% of 3.3 V (~3.04 V), with 0.5% VO hysteresis preventing chatter. PG is open-drain and requires external pull-up; it drives no current in high state and sinks up to 300 µA when low.

Is TPS76533DRG4 pin-compatible with other devices in the TPS765xx family?

Yes - all TPS765xx variants (e.g., TPS76515D, TPS76550DRG4) share identical 8-pin SOIC (D) package, pinout, and footprint. Only the output voltage and part marking differ. This allows voltage-scaling flexibility within the same PCB layout - for example, swapping TPS76533DRG4 for TPS76518DRG4 requires only firmware and BOM updates, no hardware change.

What thermal derating applies to TPS76533DRG4 in still-air conditions?

In still air (0 CFM), the SOIC-8 package has θ_JA = 176°C/W. At TA = 70°C, maximum allowable power dissipation is 312 mW (derated from 568 mW at 25°C). For VI = 5.0 V and VO = 3.3 V delivering 150 mA, PD = (5.0 − 3.3) × 0.15 = 255 mW - within safe limit. Exceeding 312 mW risks triggering thermal shutdown at junction temperatures above 150°C.