Texas Instruments TPS3600D33PW

Overview

TPS3600D33PW 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 (VIT = 2.93 V), asserts active-low RESET with 100-ms delay, supports manual reset (MR) 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 operation.

For engineers reviewing the TPS3600D33PW datasheet, TPS3600D33PW pinout, TPS3600D33PW application, or TPS3600D33PW equivalent, key selection criteria include its 2.93 V threshold accuracy, 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 embedded systems with battery backup.

Technical Context

The TPS3600D33PW implements a dual-threshold comparator architecture for VOUT monitoring: negative-going VIT = 2.93 V triggers RESET assertion, while V(SWN) = VIT + 1–3.2% enables automatic switchover to VBAT when VOUT drops below that level. Its internal 40-kΩ oscillator drives an 800-ms watchdog timer, retriggerable by WDI transitions, with built-in current-saving logic that pulses high only once per timeout cycle.

Chip-enable gating uses a transmission gate between CEIN and CEOUT, disabled during RESET to isolate CMOS RAM; BATTON provides direct PMOS gate drive for external battery-switching FETs, and BATTOK samples VBAT every 200 ms with 25-µs on-time and 100-kΩ divider load to indicate battery health above VBOK = 3.14 V (typ).

Key Specifications

Pinout & Package

TPS3600D33PW is housed in a 14-pin TSSOP (PW) package, 5.10 mm × 6.60 mm, with exposed pad not electrically connected. Pin functions are validated per TI SLVS336B datasheet (Rev. JANUARY 2007), top-view orientation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervision and battery switchover applications.

Compared with TPS3600D33PW, TPS3610D33PW offers superior power efficiency and accuracy for next-gen designs, while MAX6361L33+T reduces component count where integrated switchover isn't needed - both require layout review due to differing thermal and routing constraints.

Availability

TPS3600D33PW is available at Aetrix Electronics and suitable for portable battery-powered equipment, industrial data loggers, and point-of-sale terminals requiring stable component supply with long lifecycle support and guaranteed traceability.

Supply support for TPS3600D33PW 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 designed specifically for systems requiring robust dual-supply supervision, seamless battery backup, and memory protection - targeting portable, medical, and industrial applications where reliability under brownout conditions is non-negotiable.

FAQ

What is the exact supply voltage threshold (VIT) for TPS3600D33PW?

The TPS3600D33PW has a nominal negative-going input threshold voltage VIT of 2.93 V, with a typical range of 2.87 V to 2.99 V across −40°C to 85°C. This value is factory-trimmed and specified in the electrical characteristics table of the SLVS336B datasheet. The TPS3600D33PW uses this threshold to monitor VOUT and assert RESET when the supply drops below it, ensuring consistent 3.3 V system supervision.

Does TPS3600D33PW support automatic switchover from VDD to VBAT without asserting RESET?

Yes, the TPS3600D33PW supports automatic switchover without RESET assertion. When VOUT falls below V(SWN) - defined as VIT + 1% to +3.2% - and VBAT exceeds VDD, the device connects VBAT to VOUT through its internal 2-Ω switch while keeping RESET inactive. This behavior is confirmed in the functional description and timing diagrams of the TPS3600D33PW datasheet, enabling uninterrupted processor operation during brownout.

How does the battery-freshness seal work on TPS3600D33PW?

The battery-freshness seal on TPS3600D33PW disconnects VBAT from internal circuitry until first power-up. To activate it: apply VBAT > VBAT(min), ground PFO, connect PFI to VDD, apply VDD > VIT, ground MR, then power down VDD. The seal engages automatically, preserving battery shelf life. It's disabled by the rising edge of RESET when VDD is reapplied - a unique feature documented for the TPS3600D33PW in Section 6 of SLVS336B.

Can TPS3600D33PW monitor a secondary voltage rail besides VDD/VBAT?

Yes, the TPS3600D33PW includes a dedicated power-fail comparator with PFI and PFO pins. By connecting an external resistor divider to PFI, users can supervise any voltage ≥1.15 V (the internal reference). The comparator trips when PFI falls below 1.15 V ±12 mV hysteresis, pulling PFO low - a capability explicitly verified for the TPS3600D33PW in the "Power-Fail Comparator" section of its datasheet.

What is the maximum continuous output current supported by TPS3600D33PW?

The TPS3600D33PW supports up to 300 mA continuous output current at VOUT, with recommended operating conditions specifying 200 mA. Its VDD-to-VOUT and VBAT-to-VOUT static on-resistance is 1–2 Ω, resulting in ≤150 mV dropout at 75 mA (3.3 V operation). These values are measured and guaranteed per the absolute maximum ratings and electrical characteristics tables in the official TPS3600D33PW datasheet.