Texas Instruments TPS2412D

Overview

TPS2412D from Texas Instruments is an N+1 and ORing power rail controller IC that uses external N-channel MOSFETs to emulate low-forward-voltage diodes in redundant power systems. It features linear gate control, 3 V to 16.5 V supply range, 0.8 V to 16.5 V bus voltage support, 10 mV regulated forward voltage, and operates across –40°C to 85°C for rack server and telecom power bus applications.

For engineers reviewing the TPS2412D datasheet, TPS2412D pinout, TPS2412D application, or TPS2412D equivalent, key selection considerations include its programmable fast turnoff threshold via RSET, internal charge pump for positive gate drive, soft turnon to reduce bus transients, rapid device turnoff for bus integrity, and compatibility with TSSOP-8 and SOIC-8 packages.

Technical Context

The TPS2412D implements a linear regulation loop that actively controls the external MOSFET's gate to maintain V_AC at 10 mV-enabling precise forward-voltage emulation without saturation at light loads. Its internal charge pump generates a bias voltage referenced to the A pin, enabling positive gate drive relative to the MOSFET source.

Unlike the comparator-based TPS2413, the TPS2412D provides soft turnoff when V_AC falls between the fast turnoff threshold and 10 mV, reducing stress during gradual bus decay. It supports both N+1 supply redundancy and input bus ORing, with fast comparator-based turnoff triggered only when V_AC crosses the RSET-programmed negative threshold.

Key Specifications

Pinout & Package

TPS2412D is available in 8-pin TSSOP (PW) and SOIC (D) packages, both with exposed thermal pad options. The TSSOP variant measures 4.40 mm × 3.00 mm; SOIC measures 3.91 mm × 4.90 mm. Pin functions are identical across packages.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS2413D, the TPS2412D offers superior light-load stability and reduced reverse leakage but slower transient response; compared with TPS2410DGQ, it lacks filtering and status signaling-making it suitable for cost-sensitive, lower-noise N+1 implementations where design margins are well established.

Availability

TPS2412D is available at Aetrix Electronics and suitable for rack server (blade/rackmount), telecom power bus ORing, and battery backup unit applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS2412D 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.

The TPS241x product line was designed specifically for high-efficiency N+1 and input ORing in server, telecom, and enterprise power systems-replacing discrete diodes with active MOSFET control to minimize conduction loss and improve thermal performance.

FAQ

What is the primary function of the TPS2412D in a power system?

The TPS2412D functions as an N+1 and ORing power rail controller that replaces Schottky diodes with external N-channel MOSFETs to emulate ultra-low forward-voltage diodes. It regulates V_AC to 10 mV using linear gate control, enabling efficient power combining in redundant server and telecom power architectures. The TPS2412D achieves this through internal charge pump–based positive gate drive and programmable fast turnoff via the RSET pin.

How does the TPS2412D differ from the TPS2413D?

The TPS2412D uses linear regulation to maintain 10 mV V_AC, providing soft turnon/turnoff and stable light-load behavior, while the TPS2413D employs comparator-based on/off control with hysteresis and no regulation zone. The TPS2412D avoids oscillation at light loads and permits slightly positive RSET settings, whereas the TPS2413D requires negative thresholds and delivers faster step-load response. Both share identical pinout and package options, including TPS2412D in TSSOP-8.

What package options are available for the TPS2412D?

The TPS2412D is offered in two industry-standard packages: 8-pin TSSOP (PW) with body size 4.40 mm × 3.00 mm, and 8-pin SOIC (D) with body size 3.91 mm × 4.90 mm. Both packages support the same pin configuration and thermal performance metrics-including R_θJA = 110.3°C/W-and are fully interchangeable at the board level for layout flexibility. The TPS2412D designation confirms the TSSOP-8 variant unless otherwise specified in order codes.

Can the TPS2412D operate with bus voltages below 1 V?

Yes, the TPS2412D supports bus voltages as low as 0.8 V across the A–C pins, making it suitable for modern low-voltage server rails such as 1.2 V, 0.8 V, and 0.6 V domains. Its linear regulation loop remains functional down to this minimum, provided VDD ≥ 3 V is maintained separately. This capability enables high-efficiency ORing in advanced CPU/GPU VRM output stages where traditional diodes would incur prohibitive losses. The TPS2412D's 10 mV regulation target ensures minimal impact on system voltage margin even at sub-1 V operation.

What is the role of the BYP pin on the TPS2412D?

The BYP pin on the TPS2412D is the output of the internal charge pump, serving as the high-side supply voltage for internal comparators and the GATE driver circuitry. It must be decoupled with a 2200 pF ceramic capacitor connected directly to the A pin to filter switching noise and stabilize gate drive. Shorting BYP to a voltage below A risks permanent damage to the TPS2412D. Proper BYP decoupling is critical for reliable fast turnoff timing and low-noise V_AC sensing-especially in high-density server PCB layouts where charge pump coupling can induce false trips.