Texas Instruments TPS7A7850PWPR

Overview

TPS7A7850PWPR from Texas Instruments is a 120-mA, non-isolated smart AC/DC linear voltage regulator with integrated 4:1 switched-capacitor stage and LDO output. It delivers a fixed 5.0-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 safety-critical low-power systems.

For engineers reviewing the TPS7A7850PWPR datasheet, TPS7A7850PWPR pinout, TPS7A7850PWPR application, or TPS7A7850PWPR equivalent, this page provides verified pin functions, real-world AC/DC configuration guidance, confirmed 5.0-V output regulation behavior, power-fail detection threshold values, and validated alternatives for cap-drop-based metering and home appliance designs.

Technical Context

The TPS7A7850PWPR integrates an actively clamped full/half-bridge rectifier, dual-stage switched-capacitor charge pump (SC1±, SC2±), and precision LDO regulator - all operating in a single monolithic IC. Its architecture reduces rectified input voltage by 4× before LDO regulation, enabling direct use of line-voltage cap-drop capacitors as small as 25% of conventional linear solutions.

It features programmable power-fail detection via resistor-divider on PFD (1.24–1.42 V rising threshold), open-drain PG and PF outputs with 90.16–93.84% VLDO_OUT rising threshold, and dual UVLO circuits (VUVLO_SCIN = 17 V min, VUVLO_LDO_IN = 3.9 V rising) ensuring controlled startup under AC or DC supply modes.

Key Specifications

Pinout & Package

TPS7A7850PWPR is housed in a thermally enhanced 14-pin HTSSOP (PWP) package measuring 5.00 mm × 6.50 mm, with exposed thermal pad connected to GND for optimal heat dissipation (R_θJB = 24.2°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A7833PWPR, the TPS7A7850PWPR provides 5.0-V output for legacy 5-V peripherals without level shifters; compared with MAX5022AESA+, it integrates switching, regulation, and protection in one HTSSOP package - reducing footprint by >40% and eliminating 12+ external components.

Availability

TPS7A7850PWPR is available at Aetrix Electronics and suitable for electricity metering, smart home controllers, fire-safety devices, and industrial panel interfaces requiring stable component supply, long-term lifecycle support, and traceable sourcing for safety-certified designs.

Supply support for TPS7A7850PWPR 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 over 50 years of innovation in high-reliability, application-specific power solutions.

The TPS7A78 product line was designed specifically for magnetic tamper-proof, capacitor-drop AC/DC conversion in utility metering, building automation, and safety-critical low-power systems - prioritizing standby efficiency, integrated protection, and simplified layout.

FAQ

What is the output voltage tolerance of the TPS7A7850PWPR under full-load conditions?

The TPS7A7850PWPR delivers a fixed 5.0-V output with ±1% typical accuracy across temperature (–40°C to 125°C), load (0–120 mA), and input conditions (18–270 V_RMS). Measured load regulation is 0.21 mV/mA - meaning output deviation remains within ±25 mV at 120 mA, fully meeting 5-V TTL/CMOS and MCU supply requirements. This specification is verified per TI's SBVS343A datasheet Section 6.5.

Can the TPS7A7850PWPR operate from a DC supply instead of AC mains?

Yes, the TPS7A7850PWPR supports DC-only operation via the SCIN pin (17–23 V), bypassing the active bridge. In this mode, AC+ and AC– must be tied to GND. The device maintains 5.0-V regulation with identical accuracy and PG/PF functionality. Startup behavior changes slightly - UVLO_SCIN still applies, but UVLO_LDO_IN (3.9 V rising) governs LDO enablement. This mode is validated for 3.6-V and lower output variants, and confirmed for TPS7A7850PWPR in TI's datasheet Section 7.1.

How does the power-fail detection (PFD) pin function in the TPS7A7850PWPR?

The PFD pin on the TPS7A7850PWPR accepts a resistor-divider from VSCIN to set a programmable voltage threshold. When the divided voltage falls below 1.17–1.25 V (VIT(PFD,FALLING)), the open-drain PF pin pulls low within 1 µs - signaling imminent AC loss. The hysteresis is 110 mV, preventing chatter during brownouts. This feature is fully characterized in Electrical Characteristics Table 6.5 and enables graceful MCU shutdown before complete power collapse.

What capacitor values are required for stable operation of the TPS7A7850PWPR?

For stable TPS7A7850PWPR operation: SC1± and SC2± require ≥1.0 µF X5R 16-V and 10-V ceramics respectively; CLDO_OUT needs ≥0.68 µF X5R placed adjacent to Pin 8; CLDO_IN must be ≥6.8 µF (10× CLDO_OUT) near Pin 9; CSCIN is 22 µF for AC mode or 1.0 µF for DC mode. All values are specified in Section 6.3 of the TI datasheet and validated in typical application schematics Figure 14–15.

Is the TPS7A7850PWPR pin-compatible with other members of the TPS7A78 family?

Yes, all TPS7A78 variants - including TPS7A7833PWPR, TPS7A7825PWPR, and TPS7A7850PWPR - share identical 14-pin HTSSOP (PWP) packaging, pinout, and peripheral circuit requirements. Only the internal LDO reference differs (determining output voltage). This allows single PCB design reuse across 1.3–5.0 V options, with only resistor divider and capacitor value adjustments needed for PFD/PG thresholds and bulk capacitance.