Texas Instruments TPS7A7836PWPR

Overview

TPS7A7836PWPR 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 fixed 3.6 V output with ±1% typical accuracy, supports ≥18 V_RMS AC input via capacitor-drop architecture, and achieves ~15 mW standby power consumption. It is used in electricity meters and smoke detectors where magnetic tamper resistance and low no-load power are critical.

For engineers reviewing the TPS7A7836PWPR datasheet, TPS7A7836PWPR pinout, TPS7A7836PWPR application, or TPS7A7836PWPR equivalent, key selection considerations include its AC/DC dual-mode operation (full/half-bridge), programmable power-fail detection threshold (1.17–1.42 V), open-drain PG/PF outputs, thermal shutdown at 162°C, and HTSSOP-14 package with exposed thermal pad.

Technical Context

The TPS7A7836PWPR integrates an actively clamped full/half-bridge rectifier, a 4:1 switched-capacitor charge pump (f_SC = 200 kHz), and a precision LDO regulator. Its architecture reduces required cap-drop capacitor size by 4× versus conventional solutions while maintaining VIN ≅ VOUT × 4 and PIN ≅ POUT.

It operates in two supply modes: AC-input mode (via AC+/AC− pins with external CS/RS) and DC-input mode (direct SCIN connection). In AC mode, it regulates from rectified AC using internal UVLO_SCIN (17 V rising) and UVLO_LDO_IN (3.9 V rising) thresholds; in DC mode, SCIN must be ≥17 V for VLDO_OUT ≤3.4 V.

Key Specifications

Pinout & Package

TPS7A7836PWPR is housed in a 5.0 mm × 6.5 mm HTSSOP-14 (PWP) package with exposed thermal pad connected to GND. The pinout supports dual AC-input configurations (full-bridge or half-bridge), switched-capacitor staging (SC1±, SC2±), and system monitoring (PFD, PG, PF).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A7825PWPR, the TPS7A7836PWPR offers higher output voltage for 3.3 V–3.6 V logic systems but shares identical thermal, protection, and AC interface behavior; versus NCP1094DR2G, it integrates full AC/DC functionality and monitoring in one device, reducing BOM count and design risk.

Availability

TPS7A7836PWPR is available at Aetrix Electronics and suitable for electricity meters, smoke detectors, garage door controllers, and smart thermostats requiring stable component supply, long-term lifecycle support, and compliance with IEC 61000-4-8 and IEC 62304.

Supply support for TPS7A7836PWPR 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 decades of expertise in high-reliability industrial and energy infrastructure solutions.

The TPS7A78 product line was designed specifically for magnetic-free, low-standby-power AC/DC conversion in utility metering, life-safety, and building automation - addressing tamper resistance, efficiency, and regulatory compliance simultaneously.

FAQ

What is the maximum AC input voltage supported by the TPS7A7836PWPR?

The TPS7A7836PWPR supports AC input from 18 V_RMS up to 270 V_RMS (50–20 kHz), with absolute maximum ratings of –1.5 V to 30 V on AC+ and AC− pins. Peak line voltage handling depends on external CS capacitor voltage rating and RS surge resistor power dissipation - TI recommends ≥275 V-rated CS for 230 V_RMS mains.

Can the TPS7A7836PWPR operate from a DC source instead of AC?

Yes, the TPS7A7836PWPR supports DC-only operation by applying 17–23 V directly to the SCIN pin. In this mode, AC+ and AC− must be grounded, and the internal bridge is bypassed. The device maintains 3.6 V output with ±1% accuracy and retains all monitoring features (PG, PF, PFD) and protections.

How does the power-fail detection (PFD) pin work on the TPS7A7836PWPR?

The PFD pin is an analog input that compares a resistor-divided VSCIN voltage against an internal 1.24 V reference. When VPFD falls below 1.17–1.25 V (V_{IT(PFD,FALLING)}), the open-drain PF output pulls low. Hysteresis of 110 mV prevents chatter during slow sags - enabling robust early-warning signaling before complete AC loss.

What capacitor values are required for stable operation of the TPS7A7836PWPR?

Required capacitors: CSC1/CSC2 ≥1 µF (X5R, 16 V/10 V), CLDO_OUT ≥0.68 µF (X5R), CLDO_IN ≥0.68 µF (X5R, 10× CLDO_OUT recommended), and CSCIN = 22 µF (AC mode) or 1.0 µF (DC mode). All must be placed close to respective pins per TI layout guidelines to ensure regulation stability and low ripple.

Is the TPS7A7836PWPR pin-compatible with other variants in the TPS7A78 family?

Yes, all TPS7A78 variants (e.g., TPS7A7825PWPR, TPS7A7850PWPR) share identical HTSSOP-14 (PWP) pinout, thermal pad, and footprint. Output voltage is factory-set; no external resistors are needed. This enables voltage-scaling design reuse across platforms without PCB revision.