Texas Instruments TPS3600D25PWR

Overview

TPS3600D25PWR from Texas Instruments is a precision 2.5-V supply voltage supervisor with integrated watchdog timer, battery switchover control, and chip-enable gating. It monitors VDD/VOUT for brownout (VIT = 2.22 V typ), asserts active-low RESET with 100-ms delay, supports backup-battery operation up to 5.5 V, and delivers ≤40 µA supply current. Used in portable battery-powered equipment requiring reliable power sequencing and fail-safe backup switching.

For engineers reviewing the TPS3600D25PWR datasheet, TPS3600D25PWR pinout, TPS3600D25PWR application, or TPS3600D25PWR equivalent, key selection criteria include its 2.5-V threshold accuracy, 800-ms watchdog timeout, dual-supply switchover logic (VDD/VBAT), BATTOK battery-status monitoring, and CEIN-to-CEOUT signal gating with ≤3 ns propagation delay at 5 V.

Technical Context

The TPS3600D25PWR implements a dual-path power supervision architecture: one path monitors VOUT against a precision 2.22-V negative-going threshold (VIT) to trigger RESET, while a second path compares VBAT to VIT+7% to assert BATTOK. Its internal 2-Ω NMOS switch enables automatic switchover from VDD to VBAT when VOUT drops below V(SWN) ≈ VIT+2% and VBAT > VDD.

Watchdog functionality relies on WDI edge detection (low-to-high or high-to-low) with 0.8-s timeout; CEIN/CEOUT gating uses a transmission gate disabled during RESET assertion to isolate CMOS RAM. The device operates across −40°C to 85°C and supports manual switchover via MSWITCH and freshness seal activation via PFO/MR sequencing.

Key Specifications

Pinout & Package

TPS3600D25PWR is housed in a 14-pin TSSOP (PW) package, 5.10 mm × 6.60 mm, with exposed pad not present. Pin functions are validated per TI SLVS336B datasheet (Rev. JANUARY 2007).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3600D25PWR, both alternatives omit integrated battery switchover, watchdog timer, and chip-enable gating-key capabilities enabling fail-safe operation in portable and automotive systems with backup power requirements.

Availability

TPS3600D25PWR is available at Aetrix Electronics and suitable for portable medical monitors, industrial data loggers, and point-of-sale terminals requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for TPS3600D25PWR 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 designing analog and embedded processing solutions for industrial, automotive, and communications markets.

The TPS3600 family was engineered specifically for systems requiring coordinated power supervision, battery-backed operation, and memory protection-targeting portable, automotive, and mission-critical embedded applications.

FAQ

What is the exact supply voltage threshold for TPS3600D25PWR?

The TPS3600D25PWR has a nominal negative-going input threshold voltage (VIT) of 2.22 V at 25°C, with guaranteed range 2.17 V to 2.27 V over −40°C to 85°C. This value is factory-trimmed and applies to VOUT monitoring; it defines the point at which RESET is asserted during brownout conditions. The threshold is referenced to the internal bandgap and does not require external components.

How does the battery freshness seal work on TPS3600D25PWR?

The battery freshness seal on TPS3600D25PWR disconnects VBAT from internal circuitry until first power application. To activate: apply VBAT > VBAT(min), ground PFO, connect PFI to VDD, apply VDD > VIT, ground MR, then power down VDD. The seal disables automatically on the rising edge of RESET when VDD is reapplied. This preserves backup battery shelf life for up to 10 years.

Can TPS3600D25PWR monitor a secondary voltage rail like 3.3 V using PFI?

Yes-TPS3600D25PWR's PFI pin accepts an external resistor divider to monitor any voltage above 1.15 V. With a 1-MΩ total divider resistance and ≤1% tolerance resistors, PFI detects when the divided voltage falls below its 1.15-V internal reference, causing PFO to go low. This allows independent supervision of 3.3-V, 12-V, or other auxiliary rails without modifying the main VDD/VOUT path.

What is the maximum continuous output current supported by TPS3600D25PWR on VOUT?

TPS3600D25PWR supports up to 200 mA continuous output current on VOUT in normal mode (VDD sourcing) and 75 mA in battery-backup mode (VBAT sourcing), per TI's recommended operating conditions. At 150 mA load with 5-V VDD, VOUT drops no more than 250 mV below VDD due to its 1–2 Ω rDS(on). Exceeding 200 mA risks thermal shutdown or voltage regulation failure.

Is TPS3600D25PWR pin-compatible with other members of the TPS3600 family?

Yes-TPS3600D25PWR shares identical 14-pin TSSOP (PW) package, pinout, and functional interface with TPS3600D20PWR, TPS3600D33PWR, and TPS3600D50PWR. Only the VIT threshold differs (2.0 V, 2.5 V, 3.3 V, 5.0 V respectively); all other features-including watchdog, CE gating, BATTOK, and switchover logic-are identical across the family.