Texas Instruments TPS3600D50PWR

Overview

TPS3600D50PWR from Texas Instruments is a battery-backup supervisor IC designed for low-power processors, providing precision 5.0 V supply monitoring (VIT = 4.40 V typ), 800-ms watchdog timer, 100-ms power-on reset delay, backup-battery switchover with 2-Ω on-resistance, and BATTOK battery-status output. It enables reliable operation in portable equipment during brownout or main power failure.

For engineers reviewing the TPS3600D50PWR datasheet, TPS3600D50PWR pinout, TPS3600D50PWR application, or TPS3600D50PWR equivalent, key selection criteria include its 5.0 V threshold accuracy, battery-freshness seal function, chip-enable gating with ≤3 ns propagation delay at 5 V, and support for manual switchover to battery mode - all in a 14-pin TSSOP package rated for –40°C to 85°C.

Technical Context

The TPS3600D50PWR integrates dual-supply supervision (VDD and VBAT), automatic switchover logic triggered when VOUT falls below V(SWN) = VIT + 1%–3.2%, and a dedicated 1.15 V reference for external PFI/PFO power-fail monitoring. Its internal 40 kΩ watchdog oscillator sets the 800-ms timeout, while the BATTOK comparator samples VBAT every 200 ms with 25 µs on-time.

It implements a transmission-gate CEIN-to-CEOUT path with active pull-up during reset disable mode, enabling CMOS RAM protection during under-voltage events. The BATTON output drives external PMOS pass transistors directly, with body-diode orientation preventing battery discharge during VDD operation.

Key Specifications

Pinout & Package

14-pin TSSOP (PW) package with exposed pad not electrically connected; 0.65 mm pitch, 5.10 mm × 6.60 mm body size, JEDEC MO-153 compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar battery-backup supervisor applications.

Compared with TPS3600D50PWR, TPS3619-50PW omits battery switchover and watchdog functionality but reduces footprint and cost, while MAX6361LUT47+T offers comparable voltage monitoring with shorter reset delay but no battery interface or CE protection - making TPS3600D50PWR uniquely suited for full-featured backup supervision.

Availability

TPS3600D50PWR is available at Aetrix Electronics and suitable for portable medical monitors, point-of-sale terminals, automotive infotainment systems, and fax machines requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for TPS3600D50PWR 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 and embedded processing solutions for industrial, automotive, and personal electronics markets.

The TPS3600 family is designed specifically for battery-backed microprocessor systems requiring reliable power-fail detection, automatic switchover, and integrated watchdog functionality in space-constrained applications.

FAQ

What is the exact supply voltage threshold for TPS3600D50PWR?

The TPS3600D50PWR 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 across –40°C to 85°C. This 5.0 V-rated threshold ensures accurate detection of brownout conditions on standard 5 V rails while maintaining ±1.5% tolerance over temperature and process variation.

Does TPS3600D50PWR support automatic switchover to backup battery?

Yes, TPS3600D50PWR automatically switches VOUT from VDD to VBAT when VOUT falls below V(SWN) (VIT + 1%–3.2%) and VBAT exceeds VDD. The internal 2-Ω switch enables low-dropout backup operation, and the BATTON output drives external PMOS transistors to handle higher load currents beyond the IC's 300 mA limit.

How does the battery freshness seal function work on TPS3600D50PWR?

The battery freshness seal on TPS3600D50PWR disconnects VBAT from internal circuitry until first power application. It is enabled by grounding PFO while powering VDD and MR, then removing VDD - preserving backup battery shelf life. The seal disables automatically on the rising edge of RESET when VDD is reapplied, ensuring fresh battery capacity at end-user deployment.

What is the purpose of the CEIN and CEOUT pins on TPS3600D50PWR?

The CEIN and CEOUT pins implement chip-enable signal gating: CEIN passes through to CEOUT during normal operation, but the path is disabled during reset assertion. This prevents erroneous chip-select signals from corrupting CMOS RAM during brownout. Propagation delay is ≤3 ns at VDD = 5 V, and CEOUT is actively pulled to VOUT when disabled.

Can TPS3600D50PWR monitor voltages other than VDD?

Yes, TPS3600D50PWR includes a dedicated power-fail comparator with PFI and PFO pins. PFI compares an external voltage (via resistor divider) against a 1.15 V internal reference. When the divided voltage falls below this threshold, PFO asserts low - enabling supervision of auxiliary rails like 3.3 V, 12 V, or custom logic supplies without modifying the core VDD monitoring path.