Texas Instruments TPL5111DDCT

Overview

TPL5111DDCT from Texas Instruments is a nano-power system timer IC designed for precision power gating in ultra-low-power battery-operated systems. It delivers 35 nA typical supply current at 2.5 V, supports resistor-selectable time intervals from 100 ms to 7200 s with ±0.6% typical accuracy, and features dual operational modes (timer and one-shot) controlled via the EN/ONE_SHOT pin - enabling duty-cycled wake-up of microcontrollers in IoT sensor nodes.

For engineers reviewing the TPL5111DDCT datasheet, TPL5111DDCT pinout, TPL5111DDCT application, or TPL5111DDCT equivalent, key selection considerations include its SOT-23-6 package footprint, manual power-on capability via DELAY/M_DRV, DONE watchdog handshake timing, DRVn output drive strength, and compatibility with LDO/DC-DC enable inputs in energy-constrained embedded designs.

Technical Context

The TPL5111DDCT implements an internal low-frequency oscillator with ±0.5% typical accuracy and ±400 ppm/°C temperature drift, digitizing external resistance (500 Ω–170 kΩ) on the DELAY/M_DRV pin to configure 1650 discrete time intervals. Its functional block includes a POR-triggered REXT measurement circuit, mode decoder (based on EN/ONE_SHOT logic level), and state machine that asserts DRVn with programmable pulse width minus 50 ms - conditional on receipt of a valid DONE signal within tIP − 50 ms.

In timer mode (EN/ONE_SHOT = HIGH), it generates periodic DRVn pulses; in one-shot mode (EN/ONE_SHOT = LOW), it issues only one DRVn pulse at power-up or upon manual trigger. The DONE input accepts ≥100 ns pulses and resets DRVn early if asserted, while the DELAY/M_DRV pin serves both as analog REXT interface during startup and digital manual power-on input thereafter - debounced with 20 ms minimum assertion time.

Key Specifications

Pinout & Package

Package: 6-pin SOT-23 (DDC), body size 3.00 mm × 3.00 mm, surface-mount, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar nano-power timer applications.

Compared with TPS3897A08DBVR and MAX13050ASA+, the TPL5111DDCT uniquely combines nano-power consumption, wide resistor-programmable timing (100 ms–2 h), DONE-based dynamic pulse termination, and hardware-selectable one-shot/timer modes - making it the only option for high-efficiency, µC-coordinated power gating in long-life IoT endpoints.

Availability

TPL5111DDCT is available at Aetrix Electronics and suitable for wireless sensor networks, smart home security systems, and industrial remote monitoring requiring stable component supply and guaranteed long-term manufacturability.

Supply support for TPL5111DDCT 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 company specializing in analog, embedded processing, and power management technologies.

The TPL5111DDCT belongs to TI's nano-power timer product line, engineered specifically for ultra-low-quiescent-current power gating in battery- and energy-harvesting–powered IoT edge devices.

FAQ

What is the minimum external resistor value supported by the TPL5111DDCT for time interval configuration?

The TPL5111DDCT supports an external resistor (REXT) range of 500 Ω to 170 kΩ on the DELAY/M_DRV pin. At 500 Ω, it configures the shortest time interval of 100 ms. Using resistors below 500 Ω may result in invalid or out-of-spec timing behavior, as confirmed in Section 7.5.1 of the SNAS659B datasheet. The TPL5111DDCT performs a one-time analog-to-digital conversion of REXT during power-on reset, and values outside this range fall outside the validated measurement window.

Can the TPL5111DDCT operate reliably at 1.8 V supply voltage?

Yes, the TPL5111DDCT is fully specified to operate from 1.8 V to 5.5 V per Section 6.3 (Recommended Operating Ratings). At 1.8 V, its supply current remains within specification (≤50 nA max), and timing accuracy degradation is limited to ±25 ppm/V over supply voltage - resulting in <±0.1% additional error versus 2.5 V operation. This makes the TPL5111DDCT suitable for direct connection to partially discharged lithium coin cells or low-voltage energy harvesters.

How does the DONE signal affect the DRVn output pulse width in the TPL5111DDCT?

In the TPL5111DDCT, the DONE signal shortens the DRVn pulse width when asserted within tIP − 50 ms. Specifically, DRVn transitions LOW immediately upon recognition of a valid DONE pulse (≥100 ns, rising edge), terminating power delivery early. If DONE is not received, DRVn stays HIGH for the full programmed interval minus 50 ms, then goes LOW for the final 50 ms before the next cycle begins. This behavior is explicitly defined in Sections 7.3.1 and 7.4.2 of the TPL5111DDCT datasheet.

Is the TPL5111DDCT pin-compatible with other members of the TPL51xx family?

No, the TPL5111DDCT is not pin-compatible with other TPL51xx variants such as TPL5010 or TPL5100. While all share the SOT-23-6 (DDC) package, pin functions differ significantly - for example, TPL5010 lacks the DONE input and uses different mode control logic. The TPL5111DDCT's unique six-pin assignment (VDD, GND, DELAY/M_DRV, DONE, DRVn, EN/ONE_SHOT) is specific to its advanced watchdog and dual-mode architecture, as documented in Section 5 of the SNAS659B datasheet.

What is the maximum recommended capacitive load on the DRVn pin of the TPL5111DDCT?

The DRVn pin of the TPL5111DDCT is characterized for rise/fall times of 50 ns with a 50 pF capacitive load, as specified in Section 6.6 (Timing Requirements). Driving loads significantly exceeding 50 pF may degrade timing margins, increase transition times, and risk incomplete logic-level transitions - especially at lower supply voltages. For heavier loads, TI recommends buffering DRVn through a discrete MOSFET or gate driver, as noted in Application Section 8.2 of the TPL5111DDCT datasheet.