Texas Instruments TPS3600D20PWR

Overview

TPS3600D20PWR from Texas Instruments is a precision 2.0-V supply voltage supervisor IC with integrated watchdog timer, battery switchover control, and chip-enable gating. It monitors VDD/VOUT for brownout (VIT = 1.78 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-up sequencing and fail-safe backup switching.

For engineers reviewing the TPS3600D20PWR datasheet, TPS3600D20PWR pinout, TPS3600D20PWR application, or TPS3600D20PWR equivalent, key selection criteria include its 2.0-V threshold accuracy (±2%), 800-ms watchdog timeout, battery-freshness seal capability, CEIN-to-CEOUT propagation delay ≤3 ns at 5 V, and 14-pin TSSOP package compatibility with space-constrained embedded systems.

Technical Context

The TPS3600D20PWR implements dual-supply supervision with independent VDD and VBAT inputs, enabling seamless switchover to backup power when VOUT drops below V(SWN) = VIT + 1%–3.2%. Its internal 40-kΩ oscillator drives an 800-ms watchdog timer resettable via WDI transitions, while the BATTOK output samples battery voltage every 200 ms using a 100-kΩ divider.

Chip-enable gating uses a series transmission gate between CEIN and CEOUT, disabled during RESET assertion to prevent CMOS RAM corruption; CEOUT is actively pulled to VOUT in disable mode. The PFI comparator references 1.15 V (±2 mV) with 12-mV hysteresis, supporting external voltage monitoring via resistor dividers.

Key Specifications

Pinout & Package

TPS3600D20PWR is housed in a 14-pin TSSOP (PW) package measuring 5.10 mm × 6.60 mm, optimized for high-density PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3600D20PWR, TPS3619D20PWR trades watchdog and switchover functionality for tighter threshold tolerance and 25× lower current, while MAX6361LUR20+T offers minimal feature set at lowest cost but cannot support battery-backed systems or memory-safe reset sequences.

Availability

TPS3600D20PWR is available at Aetrix Electronics and suitable for portable battery-powered equipment, computer equipment, fax machines, and set-top boxes requiring stable component supply across extended production lifecycles.

Supply support for TPS3600D20PWR 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 consumer markets.

The TPS3600 family was designed specifically for systems requiring coordinated power supervision, battery backup switchover, and memory protection-targeting portable, telecom, and computing applications where reliability under brownout and power-fail conditions is critical.

FAQ

What is the exact supply voltage threshold for TPS3600D20PWR?

The TPS3600D20PWR has a nominal negative-going input threshold voltage (VIT) of 1.78 V, with a guaranteed range of 1.74 V to 1.82 V over −40°C to +85°C. This 2.0-V nominal rating is achieved with ±2.2% accuracy, ensuring precise detection of brownout conditions on 2.0-V rails. The threshold is referenced to VOUT and stabilized by an internal bandgap, not subject to VDD variation.

How does the battery freshness seal function in TPS3600D20PWR?

The battery freshness seal in TPS3600D20PWR disconnects VBAT from internal circuitry until first power application. To activate it: connect VBAT > VBAT(min), ground PFO, tie PFI to VDD, apply VDD > VIT, ground MR, then power down VDD. The seal remains engaged until RESET's positive edge on next power-up. This preserves backup battery shelf life by preventing parasitic drain during storage.

Can TPS3600D20PWR supervise voltages other than VDD?

Yes - TPS3600D20PWR includes a dedicated power-fail comparator with PFI input referenced to 1.15 V (±2 mV). By connecting two 1%-tolerance resistors between the target voltage and GND, any voltage ≥1.15 V can be monitored. When PFI falls below 1.15 V, PFO asserts low with 12-mV hysteresis. Unused PFI must be grounded; PFO remains unconnected.

What is the maximum continuous output current supported by TPS3600D20PWR?

TPS3600D20PWR supports up to 300 mA continuous output current at VOUT, with recommended operating limit of 200 mA. At 75 mA load, VOUT droop is ≤150 mV in normal (VDD-powered) or battery-backup (VBAT-powered) modes due to 1–2 Ω internal switch resistance. Exceeding 200 mA risks thermal derating above 70°C ambient and may affect RESET timing accuracy.

How does the chip-enable gating work in TPS3600D20PWR?

In TPS3600D20PWR, CEIN connects to CEOUT via a transmission gate enabled only when RESET is inactive. During RESET assertion, the gate disables and CEIN enters high-impedance state while CEOUT is pulled to VOUT via internal active pullup. Propagation delay is ≤3 ns at VDD = 5 V, and CEOUT impedance matches standard CMOS loads. This prevents erroneous writes to CMOS RAM during under-voltage conditions.