Texas Instruments TPS3610T50PWG4

Overview

TPS3610T50PWG4 from Texas Instruments is a precision 5-V supply-voltage supervisory IC with integrated battery switchover, watchdog timer, power-fail comparator, and chip-enable gating. It monitors VDD for reset assertion at 4.46–4.64 V, provides 800-ms watchdog timeout, supports backup-battery voltage exceeding VDD, and delivers up to 300 mA from VOUT in battery-backup mode. It is used in set-top boxes and portable long-time monitoring equipment requiring reliable data retention during brownouts.

For engineers reviewing the TPS3610T50PWG4 datasheet, TPS3610T50PWG4 pinout, TPS3610T50PWG4 application, or TPS3610T50PWG4 equivalent, key selection considerations include its 5-V nominal supply threshold (VIT = 4.55 V typ), 100-nA max battery supply current, 3-ns CE propagation delay at 5 V, BATTOK output with 2.4-V threshold, and TSSOP-14 package compatibility with industrial temperature range (–40°C to 85°C).

Technical Context

The TPS3610T50PWG4 implements dual-path power management: a 1-Ω PMOS switch connects VDD to VOUT during normal operation, while a 15-Ω switch enables VBAT-to-VOUT switchover when VDD falls below VIT. Its internal 1.15-V reference drives both the PFI comparator and LOWLINE circuit, which triggers 2% above VIT to provide early power-fail warning.

Watchdog functionality relies on edge-triggered WDI input with 0.48–1.12 s timeout; manual switchover via MSWITCH forces immediate battery mode; and chip-enable gating disables CEIN→CEOUT path during reset to prevent RAM corruption. BATTOK sampling occurs every 200 ms with 25-µs measurement window and 100-kΩ divider load.

Key Specifications

Pinout & Package

TPS3610T50PWG4 is housed in a 14-pin TSSOP (PW) package, 5.10 mm × 6.60 mm, rated for –40°C to 85°C operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar supervisory and battery-switchover applications.

Compared with TPS3610U18PWR and MAX6361ESA+, the TPS3610T50PWG4 uniquely combines 5-V precision supervision, autonomous battery switchover, and chip-enable protection in a single TSSOP-14 device-making it irreplaceable for 5-V systems requiring guaranteed RAM retention during power loss.

Availability

TPS3610T50PWG4 is available at Aetrix Electronics and suitable for set-top boxes, portable long-time monitoring equipment, and point-of-sale terminals requiring stable component supply across extended production lifecycles.

Supply support for TPS3610T50PWG4 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 experience in high-reliability supervisory circuits.

The TPS3610 family was designed specifically for systems requiring robust data retention during power failure-including fax machines, modems, and battery-backed memory modules-integrating switchover, watchdog, and voltage monitoring in one IC.

FAQ

What is the exact reset threshold voltage for TPS3610T50PWG4?

The TPS3610T50PWG4 has a guaranteed reset threshold (VIT) of 4.46 V (min), 4.55 V (typ), and 4.64 V (max) over –40°C to 85°C. This 5-V nominal specification ensures reliable reset assertion before the 5-V rail falls below the operational margin of downstream logic, and is distinct from the 1.8-V variant's 1.71-V typical threshold.

Does TPS3610T50PWG4 support backup batteries with voltage higher than the main supply?

Yes, TPS3610T50PWG4 explicitly supports VBAT > VDD-enabling use of standard 3.6-V lithium cells in 5-V systems. The internal 15-Ω switchover switch engages only when VDD falls below VIT and VBAT exceeds VDD, preventing reverse current and eliminating need for external diodes or regulators.

How does the watchdog timer in TPS3610T50PWG4 operate?

The TPS3610T50PWG4 watchdog requires a rising or falling edge on WDI within 0.48–1.12 s to reset its internal timer. If unconnected, it self-triggers; if driven externally, low-to-high or high-to-low transitions both qualify. Leaving WDI low for 7/8 of the timeout period minimizes current draw-critical for battery longevity.

What is the purpose of the BATTOK output on TPS3610T50PWG4?

BATTOK on TPS3610T50PWG4 is a logic-level indicator asserting high when VBAT exceeds 2.33–2.47 V. It samples battery voltage every 200 ms using a 100-kΩ divider load and 25-µs measurement window-providing verified battery health status without continuous drain, essential for long-life portable applications.

Can TPS3610T50PWG4 be used in systems requiring chip-enable signal protection?

Yes, TPS3610T50PWG4 integrates dedicated CEIN/CEOUT gating that disables the signal path during RESET assertion. With 3-ns propagation delay at 5 V and automatic high-impedance CEIN during reset, it prevents spurious writes to CMOS RAM-eliminating need for external logic or timing-critical firmware workarounds.