Texas Instruments TPS7A7833PWPR

Overview

TPS7A7833PWPR from Texas Instruments is a 120-mA, non-isolated smart AC/DC linear voltage regulator with integrated active bridge rectifier, 4:1 switched-capacitor stage, and LDO. It delivers a fixed 3.3-V output with ±1% typical accuracy, supports ≥18 V_RMS AC input (full- or half-bridge), achieves up to 75% efficiency, and maintains standby power at 15 mW (typical) - enabling magnetic-tamper-proof power supplies for electricity meters and smoke detectors.

For engineers reviewing the TPS7A7833PWPR datasheet, TPS7A7833PWPR pinout, TPS7A7833PWPR application, or TPS7A7833PWPR equivalent, key selection considerations include its AC/DC dual-mode operation (AC+/- or DC on SCIN), programmable power-fail detection threshold (1.17–1.42 V), open-drain PG/PF outputs, thermal shutdown (162°C), and HTSSOP-14 package with exposed thermal pad for industrial-grade thermal performance.

Technical Context

The TPS7A7833PWPR integrates an actively clamped full/half-bridge rectifier, a 200-kHz 4:1 switched-capacitor charge pump (reducing SCIN voltage by factor of 4 while increasing current proportionally), and a precision LDO stage. Its architecture eliminates external magnetics and enables cap-drop capacitor sizing as low as 1/4 that of conventional linear solutions.

It features dual undervoltage lockout (UVLO_SCIN = 17 V rising; UVLO_LDO_IN = 3.9 V rising), programmable PFD via resistor divider (V_{IT(PFD,FALLING)} = 1.17–1.25 V), and power-good detection referenced to 90.16–93.84% of VLDO_OUT. Startup behavior depends on CSCIN bulk capacitance (22 µF typical) and CSC1/CSC2 staging (1–4.7 µF each).

Key Specifications

Pinout & Package

TPS7A7833PWPR is housed in a 5.0 mm × 6.5 mm HTSSOP-14 (PWP) package with exposed thermal pad connected to GND for enhanced thermal dissipation (R_θJB = 24.2°C/W). The package supports reflow soldering per JEDEC J-STD-020 and requires thermal pad soldering to a large-area ground plane.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar AC/DC linear regulator applications.

Compared with TPS7A7825PWPR and TPS7A7850PWPR, the TPS7A7833PWPR offers optimal balance for modern 3.3-V microcontrollers and wireless SoCs - delivering tighter regulation tolerance (±1%), lower dropout headroom requirement, and compatibility with common IoT sensor interfaces.

Availability

TPS7A7833PWPR is available at Aetrix Electronics and suitable for electricity metering, smoke detector design, garage door automation, smart thermostat development, and industrial AC-powered sensor nodes requiring stable component supply across multi-year production cycles.

Supply support for TPS7A7833PWPR 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 ICs, with decades of expertise in high-reliability power conversion and industrial-grade signal chain solutions.

The TPS7A78 family was designed specifically for magnetic-free, high-efficiency AC/DC conversion in safety-critical and tamper-resistant applications - targeting electricity meters, building automation, and life-safety devices compliant with IEC 62304 and UL 217.

FAQ

What is the minimum AC input voltage supported by the TPS7A7833PWPR?

The TPS7A7833PWPR requires a minimum AC input of 18 V_RMS to ensure reliable startup and regulation. This is enforced by the UVLO_SCIN circuit, which has a rising threshold of 17 V (corresponding to ~24 V_peak). Below this level, the device remains in undervoltage lockout and does not engage the active bridge or switched-capacitor stage. The TPS7A7833PWPR supports up to 277 V_RMS with appropriate external CS and RS component ratings.

Can the TPS7A7833PWPR operate from a DC supply instead of AC?

Yes - the TPS7A7833PWPR supports DC-only operation by applying 17–23 V directly to the SCIN pin. In this mode, the active bridge is bypassed, and the switched-capacitor stage operates from the DC input. AC+ and AC− pins must be grounded. This configuration is validated for output voltages ≤3.4 V (including the 3.3-V TPS7A7833PWPR) and enables backup power or DC-powered subsystems.

How is power-fail detection configured on the TPS7A7833PWPR?

Power-fail detection on the TPS7A7833PWPR is configured using an external resistor divider from SCIN to GND, feeding the PFD pin. The falling threshold is 1.17–1.25 V (with 110-mV hysteresis), so R1 and R2 values are selected to scale VSCIN accordingly. For example, with VSCIN = 20 V, R1 = 150 kΩ and R2 = 10 kΩ yields ~1.25 V at PFD. The PF pin asserts low when this threshold is crossed, signaling imminent AC loss to the host MCU.

What are the mandatory external capacitors for stable operation of the TPS7A7833PWPR?

Four mandatory capacitors ensure stable operation of the TPS7A7833PWPR: (1) CSCIN (22 µF, min.) between SCIN and GND for bulk energy storage; (2) CSC1 (1–4.7 µF, 16-V X5R) between SC1+ and SC1−; (3) CSC2 (1–4.7 µF, 10-V X5R) between SC2+ and SC2−; and (4) CLDO_OUT (0.68–100 µF, X5R) between LDO_OUT and GND. CLDO_IN (0.68–1000 µF) on LDO_IN is also required for LDO stability and transient response.

Does the TPS7A7833PWPR require external magnetics or transformers?

No - the TPS7A7833PWPR is explicitly designed as a magnetic-free AC/DC solution. It replaces transformers and inductors with an active bridge rectifier and switched-capacitor charge pump, eliminating magnetic tampering vulnerabilities and simplifying compliance with IEC 61000-4-8. All energy transfer occurs through capacitors (CS, CSCIN, CSC1, CSC2) and controlled semiconductor switching - no magnetic components are needed for TPS7A7833PWPR operation.