Texas Instruments TPS3600D50PWG4

Overview

TPS3600D50PWG4 from Texas Instruments is a precision 5.0 V supply voltage supervisor IC with integrated watchdog timer, battery switchover control, and chip-enable gating. It monitors VDD/VOUT for brownout (VIT = 4.40 V typ), asserts active-low RESET with 100-ms delay, supports manual reset and battery-freshness seal, and delivers up to 300 mA output current in TSSOP-14 package. Used in portable battery-powered equipment requiring reliable power sequencing and backup-battery management.

For engineers reviewing the TPS3600D50PWG4 datasheet, TPS3600D50PWG4 pinout, TPS3600D50PWG4 application, or TPS3600D50PWG4 equivalent, key selection criteria include its 5.0 V threshold accuracy (±1.5% over −40°C to 85°C), 40 µA max supply current, 800-ms watchdog timeout, dual-supply switchover logic (VDD/VBAT), and CEIN-to-CEOUT propagation delay of ≤3 ns at 5 V - all critical for low-power microcontroller-based systems with battery backup.

Technical Context

The TPS3600D50PWG4 implements a dual-threshold comparator architecture for VOUT monitoring: negative-going VIT = 4.40 V (typ) triggers RESET assertion, while V(SWN) = VIT + 1–3.2% governs automatic switchover from VDD to VBAT during brownout. Its internal 40-kΩ oscillator drives an 800-ms watchdog timer, retriggered by WDI transitions, and features a dedicated 2-Ω NMOS switch between VBAT and VOUT for low-dropout backup power delivery.

Chip-enable gating uses a series transmission gate between CEIN and CEOUT, disabled during RESET assertion to prevent data corruption in CMOS RAM; CEOUT is actively pulled to VOUT in disable mode. The BATTOK output performs periodic (every 200 ms) 25-µs battery-voltage sampling via internal 100-kΩ divider, asserting low when VBAT falls below VBOK = 4.71 V (typ), enabling precise low-battery detection without external circuitry.

Key Specifications

Pinout & Package

TPS3600D50PWG4 is housed in a 14-pin TSSOP (PW) package, 5.10 mm × 6.60 mm body size, 0.65 mm lead pitch, RoHS-compliant NIPDAU finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3823-50DBVR and MAX6369KA29+T, the TPS3600D50PWG4 uniquely integrates 5.0 V supervision, 800-ms watchdog, automatic/manual battery switchover, and CE gating in one 14-pin TSSOP - eliminating four discrete functions required by alternatives and enabling compact, fail-safe designs for portable and industrial equipment.

Availability

TPS3600D50PWG4 is available at Aetrix Electronics and suitable for portable battery-powered equipment, computer equipment, advanced modems, and point-of-sale equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for TPS3600D50PWG4 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 personal electronics markets.

The TPS3600 family is designed for intelligent power supervision in battery-critical systems - integrating voltage monitoring, watchdog, switchover control, and memory protection to ensure reliable operation during power transitions and failures.

FAQ

What is the exact reset threshold voltage for TPS3600D50PWG4, and how stable is it over temperature?

The TPS3600D50PWG4 has a nominal negative-going input threshold voltage (VIT) of 4.40 V (typical), with min/max values of 4.31 V and 4.49 V over −40°C to 85°C. Its normalized VIT drift is less than ±0.1% across this range (per Figure 10), ensuring highly stable reset behavior in industrial environments without requiring external calibration. This stability is achieved via on-chip bandgap reference and matched comparator design.

How does the battery switchover function work in TPS3600D50PWG4, and what are the voltage thresholds involved?

The TPS3600D50PWG4 switches VOUT from VDD to VBAT when VOUT falls below V(SWN), defined as VIT + 1–3.2% (≈4.44–4.54 V). Switchover occurs only if VBAT > VDD, preventing reverse current. Recovery to VDD happens when VDD rises above V(SWP) (VIT + 2–3.2%) or exceeds VBAT. This hysteresis prevents oscillation during marginal supply conditions and is implemented via internal comparator networks independent of external components.

Can TPS3600D50PWG4 monitor a secondary voltage rail like +12 V, and how is that configured?

Yes - the TPS3600D50PWG4 monitors auxiliary voltages via the PFI pin, which compares input against an internal 1.15 V reference. To supervise a +12 V rail, connect PFI to a resistor divider (e.g., 1.07 MΩ top, 100 kΩ bottom) yielding 1.15 V at PFI when input is 12 V. Total divider resistance should be ~1 MΩ to minimize loading; 1% resistors ensure <±12 mV threshold error. PFO then asserts low when the monitored rail falls below the set point.

What is the purpose of the BATTON pin on TPS3600D50PWG4, and how should it be used with an external MOSFET?

BATTON is a push-pull driver output that goes high when VBAT is connected to VOUT. It directly drives the gate of an external PMOS transistor (e.g., Si2301) without a current-limiting resistor. As shown in Figure 3, the PMOS is oriented with source to VBAT and drain to VOUT so its body diode blocks reverse current from VBAT to VDD. This configuration enables high-current battery switchover (>500 mA) beyond the IC's internal 2-Ω switch capability.

Does TPS3600D50PWG4 support manual reset, and what are the electrical requirements for the MR pin?

Yes - the MR pin is an active-low, asynchronous manual reset input. It requires a minimum pulse width of 100 ns (per Table 13) and accepts logic levels referenced to VDD: VIH ≥ 0.7×VDD and VIL ≤ 0.3×VDD. Internal debouncing ensures noise immunity, and pulling MR low asserts RESET immediately regardless of VOUT level. When unused, MR must be tied to VDD or pulled up externally to prevent spurious resets.