Texas Instruments TPS3600D33PWR

Overview

TPS3600D33PWR from Texas Instruments is a precision 3.3 V supply voltage supervisor IC with integrated watchdog timer, battery switchover control, and chip-enable gating. It monitors VDD/VOUT for brownout (2.93 V threshold), asserts active-low RESET with 100-ms delay, supports manual battery backup activation via MSWITCH, and delivers ≤40 µA supply current. Used in portable battery-powered equipment requiring reliable power sequencing and fail-safe backup operation.

For engineers reviewing the TPS3600D33PWR datasheet, TPS3600D33PWR pinout, TPS3600D33PWR application, or TPS3600D33PWR equivalent, key selection criteria include its 2.93 V negative-going reset threshold, 800-ms watchdog timeout, dual-supply switchover capability (VDD/VBAT), BATTOK battery-status output, and 14-pin TSSOP package with CEIN/CEOUT signal gating for CMOS RAM protection.

Technical Context

The TPS3600D33PWR implements a dual-path power supervision architecture: one path monitors VOUT against a fixed 2.93 V (±3%) threshold to trigger RESET, while a second path enables automatic or manual switchover between VDD and VBAT using internal 2-Ω switches. Its watchdog logic requires WDI toggling every 0.8 s (typ) to prevent timeout-induced RESET assertion.

It integrates three critical control functions: (1) Power-on reset generation with fixed 100-ms delay after VOUT exceeds VIT; (2) Chip-enable transmission gate (CEIN→CEOUT) with <3 ns propagation delay at 5 V and automatic disable during RESET assertion; (3) Battery-freshness seal mode activated by grounding PFO/MR during power-down to isolate VBAT until first system boot.

Key Specifications

Pinout & Package

TPS3600D33PWR is housed in a 14-pin TSSOP (PW) package (5.10 mm × 6.60 mm), RoHS-compliant, with NIPDAU lead finish and MSL Level-1 rating.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervisor applications.

Compared with TPS3600D33PWR, TPS3619D33PWR reduces cost by omitting battery management features, while MAX6369KA33+T offers pin-compatible simplicity but lacks the integrated switchover and CE protection critical for battery-backed memory systems.

Availability

TPS3600D33PWR is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC controllers, automotive infotainment head units, and point-of-sale terminals requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TPS3600D33PWR 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 connectivity technologies, with decades of expertise in power management and system supervision ICs.

The TPS3600 family was engineered specifically for systems requiring robust dual-supply supervision, battery-backed memory retention, and fail-safe power sequencing - targeting portable, industrial, and automotive applications where reliability under voltage stress is critical.

FAQ

What is the exact reset threshold voltage for TPS3600D33PWR?

The TPS3600D33PWR has a nominal negative-going reset threshold voltage (VIT) of 2.93 V, with a guaranteed range of 2.87 V to 2.99 V over −40°C to 85°C. This value is factory-trimmed and specified in the Electrical Characteristics table (page 11) of the SLVS336B datasheet, ensuring precise 3.3 V rail monitoring without external calibration.

How does the battery-freshness seal function in TPS3600D33PWR?

The battery-freshness seal in TPS3600D33PWR isolates the VBAT pin from internal circuitry until first power-up. It is enabled by grounding PFO and MR while powering down VDD, preventing backup battery discharge during storage. The seal is automatically disabled by the rising edge of RESET when VDD is applied, ensuring the battery remains fresh for end-user deployment.

Can TPS3600D33PWR supervise voltages other than 3.3 V?

Yes - TPS3600D33PWR includes a dedicated power-fail comparator (PFI/PFO) that monitors auxiliary voltages using an external resistor divider. With a 1.15 V internal reference and 12 mV hysteresis, it can supervise any voltage above ~1.15 V (e.g., 5 V, 12 V rails) by selecting appropriate resistor values totaling ~1 MΩ, enabling multi-rail supervision with a single IC.

What is the maximum continuous output current supported by TPS3600D33PWR's VOUT pin?

The TPS3600D33PWR supports up to 300 mA continuous output current at VOUT, with recommended operating conditions specifying 200 mA maximum for reliable performance. At 75 mA load and 3.3 V VDD, the typical VOUT drop is ≤150 mV due to the 1–2 Ω internal switch resistance, making it suitable for powering low-power MCUs and SRAM.

Does TPS3600D33PWR require external components for basic operation?

Yes - TPS3600D33PWR requires a 0.1 µF ceramic bypass capacitor at VDD (per Note 3, page 11) for stable threshold reference, and pull-down resistors on MR and MSWITCH (if unused) to prevent floating inputs. For PFI monitoring, two 1% tolerance resistors (~1 MΩ total) are needed. No external components are required for RESET, CE gating, or watchdog functionality.