Texas Instruments TPS3610T50PWRG4

Overview

TPS3610T50PWRG4 from Texas Instruments is a 5-V nominal supply-voltage supervisory circuit with integrated backup-battery switchover, watchdog timer (800-ms timeout), power-fail comparator, and battery-OK monitoring. It delivers 40 µA max supply current, supports –40°C to 85°C operation, and drives CMOS RAM retention in systems experiencing brownouts or main power loss.

For engineers reviewing the TPS3610T50PWRG4 datasheet, TPS3610T50PWRG4 pinout, TPS3610T50PWRG4 application, or TPS3610T50PWRG4 equivalent, key selection criteria include its 4.46–4.64 V reset threshold, 2.33–2.47 V BATTOK threshold, 14-pin TSSOP package, and dual-supply switchover logic enabling seamless RAM backup during VDD failure.

Technical Context

The TPS3610T50PWRG4 implements a precision voltage supervisor with fixed 100-ms reset delay after VDD crosses its 4.55 V typical threshold, plus independent low-line warning (LOWLINE) triggered at ~2% above VIT. Its internal 40-kΩ oscillator enables the watchdog function, and the chip-enable gating path provides sub-3 ns propagation delay at 5 V.

Backup switchover uses two discrete PMOS switches: a 1-Ω (max) VDD-to-VOUT path and an 8–15 Ω VBAT-to-VOUT path, activated only when VDD falls below VIT and VBAT exceeds VDD. The BATTOK output samples battery voltage every 200 ms with 25-µs on-time and 100-kΩ divider loading.

Key Specifications

Pinout & Package

TPS3610T50PWRG4 is housed in a 14-pin TSSOP (PW) package, 5.10 mm × 6.60 mm, tape-and-reel compatible (R suffix). Pin functions are validated per TI SLVS327B datasheet.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar supervisory circuit applications.

Compared with TPS3610U18PWR and TPS3823-50DBVR, the TPS3610T50PWRG4 uniquely combines 5-V precision supervision, battery switchover, watchdog timing, and chip-enable gating in a single 14-pin TSSOP-making it irreplaceable for systems requiring full data-retention integrity during power transitions.

Availability

TPS3610T50PWRG4 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial data loggers, and point-of-sale terminals requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for TPS3610T50PWRG4 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 consumer applications.

The TPS3610 family was designed specifically for systems requiring robust, multi-function power supervision-including backup-battery management, RAM write protection, and early power-fail warning-in space-constrained industrial and automotive platforms.

FAQ

What is the exact reset threshold voltage range for TPS3610T50PWRG4?

The TPS3610T50PWRG4 has a guaranteed reset threshold (VIT) range of 4.46 V to 4.64 V at TA = –40°C to 85°C, with a typical value of 4.55 V. This specification ensures reliable reset assertion in 5-V systems before critical undervoltage occurs, and is validated per TI SLVS327B datasheet Section 13.

Does TPS3610T50PWRG4 support manual battery switchover, and how is it implemented?

Yes, TPS3610T50PWRG4 supports manual switchover via the MSWITCH pin. Driving MSWITCH high forces immediate transition to battery-backup mode regardless of VDD level. When unused, MSWITCH must be grounded. This feature enables deterministic testing and controlled power-down sequences without relying on VDD collapse.

How does the battery freshness seal function in TPS3610T50PWRG4?

The battery freshness seal in TPS3610T50PWRG4 isolates the VBAT pin from internal circuitry until first power application. It activates upon VDD application with specific PFI/PFO grounding sequence, preventing premature discharge of the backup lithium cell during storage. The seal is disabled by the rising edge of RESET, ensuring battery longevity until system deployment.

What is the maximum continuous output current capability of TPS3610T50PWRG4's VOUT pin?

The TPS3610T50PWRG4 VOUT pin supports up to 300 mA continuous output current under recommended operating conditions. Absolute maximum rating is 400 mA, but sustained operation above 300 mA may exceed thermal limits in the 14-pin TSSOP package, especially at elevated ambient temperatures.

Can TPS3610T50PWRG4 monitor a secondary power rail other than VDD?

Yes, TPS3610T50PWRG4 includes a dedicated power-fail comparator with PFI (power-fail input) and PFO (power-fail output) pins. By connecting an external resistor divider to PFI, users can supervise any DC voltage above ~1.15 V. The comparator has 12 mV hysteresis and supports programmable thresholds with ≤1% resistor tolerance for accuracy.