Texas Instruments TPS2419D

Overview

TPS2419D from Texas Instruments is an N+1 and ORing power rail controller that drives external N-channel MOSFETs to replace lossy ORing diodes in redundant power systems. It operates across 3 V to 16.5 V input rails, features programmable turn-off threshold (–170 mV to +5 mV), soft turn-on, rapid gate turnoff (<200 ns), and industrial temperature range (–40°C to 85°C). It is used in server blade N+1 power supplies where reverse current blocking and efficiency are critical.

For engineers reviewing the TPS2419D datasheet, TPS2419D pinout, TPS2419D application, or TPS2419D equivalent, key selection considerations include its ON/OFF gate control architecture, RSET-programmable turn-off voltage, EN-controlled forced shutdown, 8-pin SOIC package compatibility, and differential sensing of V(A–C) for precise MOSFET gating in high-availability power modules.

Technical Context

The TPS2419D implements a comparator-based hysteresis control loop with separate turn-on (65 mV typical) and programmable turn-off thresholds. Its internal charge pump referenced to the A pin generates gate drive voltage relative to the MOSFET source, enabling efficient low-side sensing and high-side gate control.

It uses dual voltage sense inputs (A = simulated anode, C = simulated cathode) to monitor forward voltage drop across the external MOSFET, while BYP hosts a dedicated 2200 pF bypass capacitor for stable internal comparator bias. The EN pin provides system-level override capability without automatic re-enable on rising edge.

Key Specifications

Pinout & Package

TPS2419D is housed in an 8-pin SOIC (D) package with exposed pad not present. Pin functions are validated per TI SLVS998B datasheet Figure 1 and Terminal Functions table.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ORing controller applications.

Compared with TPS2412D and LTC4357IMS8#PBF, the TPS2419D uniquely combines programmable turn-off threshold, system-level EN control, and SOIC-8 compatibility - making it optimal for field-upgradable N+1 server and telecom systems requiring both flexibility and proven reliability.

Availability

TPS2419D is available at Aetrix Electronics and suitable for server blade N+1 power supplies, telecom redundant input bus ORing, and high-availability power modules requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS2419D 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 power management ICs, with decades of heritage in high-reliability power control solutions.

The TPS2419D belongs to TI's ORing and N+1 power rail controller product line, designed specifically for efficiency-critical redundant power architectures in servers, telecom infrastructure, and industrial systems.

FAQ

What is the function of the RSVD pin on the TPS2419D?

The RSVD pin on the TPS2419D is not reserved for future use - it is a mandatory power connection that must be tied directly to GND. This pin supplies internal bias current for the charge pump and comparator circuits. Leaving RSVD floating or unconnected causes improper gate drive behavior and potential device malfunction. TI's datasheet explicitly states "This pin must be connected to GND" in the Terminal Functions table.

How does the RSET pin affect reverse current in a TPS2419D design?

The RSET pin on the TPS2419D sets the V(A–C) turn-off threshold via an external resistor to GND. A negative threshold (e.g., –142 mV with 3.24 kΩ) permits controlled reverse current equal to |threshold| / rDS(on) of the external MOSFET. For example, with a 10 mΩ FET, –142 mV yields ~14.2 A reverse current. This is intentional for noise immunity but must be calculated against system fault limits - the TPS2419D itself does not limit reverse current beyond threshold enforcement.

Can the TPS2419D drive multiple parallel MOSFETs?

Yes, the TPS2419D can drive multiple parallel N-channel MOSFETs, provided total gate capacitance remains within its 290 μA typical gate charge current capability and layout maintains matched source impedances. TI application notes confirm successful operation with dual CSD16401 FETs. However, gate resistance (RGATE) must be added per FET to ensure balanced turn-on/turn-off and avoid shoot-through - the TPS2419D's pulsed 2.35 A sink supports fast discharge but requires careful PCB routing to minimize inductance.

What is the minimum recommended BYP capacitor value for stable TPS2419D operation?

The minimum recommended BYP capacitor value for the TPS2419D is 2200 pF, as specified in the Recommended Operating Conditions table and confirmed in the DETAILED DESCRIPTION section. TI recommends a 2200 pF X7R ceramic capacitor rated for 25 V or 50 V, placed directly between BYP and A pins with short, low-inductance traces. Values below 2200 pF risk comparator instability and erratic gate toggling due to insufficient charge pump filtering - 800 pF is the absolute lower limit but not advised for production designs.

Does the TPS2419D provide built-in overtemperature protection?

Yes, the TPS2419D includes thermal shutdown protection that activates at 135°C junction temperature with 10°C hysteresis. When triggered, it disables gate drive and leaves only a resistive pull-down active on the GATE pin - preventing MOSFET latch-up while allowing safe cooldown. This protection is internal and does not require external components. The shutdown is non-latching: gate drive resumes automatically once TJ falls below 125°C, but only if EN remains high and V(C) > 3 V.