Texas Instruments TPS79433DGNRG4

Overview

TPS79433DGNRG4 from Texas Instruments is a 3.3 V fixed-output, 250 mA low-dropout linear regulator in HVSSOP-8 (DGN) package, featuring 145 mV typical dropout at full load, 60 dB PSRR at 10 kHz, and fast 50 µs start-up-designed for noise-sensitive analog rails in portable RF electronics and smart peripherals.

For engineers reviewing the TPS79433DGNRG4 datasheet, TPS79433DGNRG4 pinout, TPS79433DGNRG4 application, or TPS79433DGNRG4 equivalent, key selection criteria include output noise performance (33 µV_RMS with 10 nF NR capacitor), thermal shutdown behavior, enable logic thresholds (0.85 V_HIGH, 0.425 V_LOW for new chip), and compatibility with 2.2 µF ceramic output capacitors.

Technical Context

The TPS79433DGNRG4 implements a PMOS pass transistor architecture with undervoltage lockout (UVLO) activation at 1.32–1.6 V and active discharge via internal pulldown MOSFET upon disable. It operates across –40°C to +125°C junction temperature with foldback current limiting (320–460 mA I_CL, 175 mA I_SC) and thermal shutdown at ~165°C.

This device belongs to the "new chip" revision of the TPS794 family: NR/NC pin is unconnected (not noise-reduction), feed-forward capacitor option is 10–100 nF, and quiescent current is 250–1000 µA. It requires no external feedback network and delivers ±3% output accuracy over load, line, and temperature.

Key Specifications

Pinout & Package

HVSSOP-8 (DGN) package with exposed thermal pad (PowerPad™); 3.0 mm × 4.9 mm footprint; 0.65 mm pitch; RoHS-compliant, green molding compound.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS79433DGNRG4, TPS79633DRBR trades active discharge and PSRR for smaller footprint, while TPS7A2033PDBVR offers superior noise and dropout at the cost of enable functionality and higher input voltage capability - selection depends on whether sequencing control, noise floor, or board area dominates the design priority.

Availability

TPS79433DGNRG4 is available at Aetrix Electronics and suitable for smartphone baseband power, USB-C peripheral LDO rails, industrial IoT sensor nodes, and home theater audio DAC supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS79433DGNRG4 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 with emphasis on reliability, precision, and energy efficiency.

The TPS794 family was designed for noise-sensitive portable electronics requiring fast transient response, low dropout, and integrated enable control - targeting RF, audio, and precision analog subsystems in space-constrained applications.

FAQ

What is the maximum input voltage for TPS79433DGNRG4?

The absolute maximum input voltage for TPS79433DGNRG4 is 6.5 V for the new-chip revision. The recommended operating range is 2.7 V to 5.5 V. Exceeding 6.5 V risks permanent damage per Absolute Maximum Ratings. For reliable operation, ensure VIN does not exceed VOUT + 0.3 V (i.e., ≤3.6 V) when reverse current protection is not implemented - this limit applies specifically to TPS79433DGNRG4 due to its internal PMOS body diode.

Does TPS79433DGNRG4 require an external noise-reduction capacitor?

No, TPS79433DGNRG4 does not require an external noise-reduction capacitor. As a "new chip" revision, its NR/NC pin is unconnected and serves no noise-filtering function. Output noise of 33 µV_RMS is achieved using only the internal bandgap and 2.2 µF output capacitor. Adding an external capacitor to pin 4 provides no benefit and may compromise thermal performance - the TPS79433DGNRG4 datasheet explicitly states NR/NC is "not internally connected" for this variant.

What is the shutdown current of TPS79433DGNRG4?

The shutdown current of TPS79433DGNRG4 is ≤1 µA at V_EN = 0 V and 2.7 V ≤ V_IN ≤ 5.5 V. This ultra-low I_SHDN enables multi-year battery life in always-connected IoT endpoints. The value is confirmed in Section 5.5 Electrical Characteristics of the official SLVS349F datasheet and applies specifically to the new-chip revision used in TPS79433DGNRG4 - not the legacy version with higher 0.07–1 µA spec.

Can TPS79433DGNRG4 be used with a 1 µF output capacitor?

No, TPS79433DGNRG4 requires a minimum of 2.2 µF ceramic output capacitor for guaranteed stability. While the new-chip revision supports a minimum *effective* capacitance of 0.47 µF, TI's validated design and stability testing assume ≥2.2 µF X5R/X7R ceramic placed within 3 mm of the OUT and GND pins. Using only 1 µF risks oscillation, especially under dynamic load conditions - the TPS79433DGNRG4 datasheet Table 5-3 explicitly lists 2.2 µF as the recommended C_OUT minimum.

Is TPS79433DGNRG4 pin-compatible with other TPS794 variants in HVSSOP-8?

Yes, TPS79433DGNRG4 is pin-compatible with all TPS794 family members in the DGN (HVSSOP-8) package, including adjustable versions like TPS79401DGNRG4. Pin functions - IN, GND, EN, OUT, FB/NC, NR/NC, and NC positions - match exactly per Figure 4-1 and Table 4-1 of the SLVS349F datasheet. However, FB/NC and NR/NC behave differently between fixed and adjustable variants, so PCB layout must match the intended function - TPS79433DGNRG4 uses both as no-connect.