NXP Semiconductors TEA1998TS/1H

Overview

TEA1998TS/1H from NXP Semiconductors is a GreenChip synchronous rectifier (SR) controller IC for flyback SMPS secondary-side rectification, featuring adaptive gate drive, drain-source differential sensing (−400 mV activation), 25 mV regulation voltage, and self-supply capability for low-voltage (<4.7 V) or high-side SR applications. It drives external MOSFETs in USB BC, QuickCharge, and ultra-low-output adapters.

For engineers reviewing the TEA1998TS/1H datasheet, TEA1998TS/1H pinout, TEA1998TS/1H application, or TEA1998TS/1H equivalent, key selection criteria include its TSOP6 package, 0.7 A source / 0.5 A sink gate driver, UVLO with active pull-down, and support for both standard and logic-level SR MOSFETs without auxiliary winding.

Technical Context

The TEA1998TS/1H implements adaptive synchronous rectification by sensing the drain-to-source voltage of an external MOSFET via dedicated DRAIN and SOURCE pins, regulating conduction to maintain −25 mV differential during active phase. Its SOI process enables robust operation up to 60 V on the DRAIN pin and supports high dI/dt environments with Kelvin source sensing.

Startup is managed through dual-supply paths: CAP pin charging via DRAIN when XV < 4.7 V, or via internal regulator from XV when ≥4.7 V. Gate drive output is clamped to CAP voltage (4.7–10 V), enabling compatibility with logic-level MOSFETs at 4.9 V typical max output when XV = 5 V.

Key Specifications

Pinout & Package

TEA1998TS/1H is housed in a TSOP6 (SOT457) plastic surface-mount package: 6-lead, 1.3 mm × 3.0 mm body, 0.95 mm pitch, 1.1 mm height, optimized for compact flyback secondary-side layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NCP4307DR2G and IRS2193PBF, TEA1998TS/1H uniquely integrates adaptive regulation, dual-path self-supply, and Kelvin sensing in a single TSOP6 package-enabling simpler, more efficient, and lower-BOM-cost flyback SR implementations across the full 0–20 V output range.

Availability

TEA1998TS/1H is available at Aetrix Electronics and suitable for USB-C PD chargers, QuickCharge adapters, and low-voltage flyback power supplies requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for TEA1998TS/1H 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

NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and consumer applications.

The TEA1998TS/1H belongs to NXP's GreenChip family of high-efficiency power conversion ICs, designed specifically to replace secondary-side diodes in flyback converters with intelligent synchronous rectification-targeting energy-efficient AC-DC adapters, chargers, and low-power SMPS.

FAQ

What is the primary function of the TEA1998TS/1H in a flyback power supply?

The TEA1998TS/1H serves as a dedicated synchronous rectifier controller on the secondary side of flyback converters. It senses the drain-source voltage of an external MOSFET via dedicated DRAIN and SOURCE pins, then drives the MOSFET gate to replace the traditional output rectifier diode-reducing conduction losses and improving overall efficiency. Its adaptive regulation maintains −25 mV V_DS during conduction, and the TEA1998TS/1H operates across output voltages from 0 V to 20 V.

How does the TEA1998TS/1H achieve self-supply in low-output-voltage applications?

The TEA1998TS/1H achieves self-supply by charging its internal CAP pin capacitor either through the DRAIN pin (when XV voltage is below 4.7 V) or via an internal regulator from the XV pin (when XV ≥ 4.7 V). This allows operation in battery charging applications with output voltages as low as 0 V, eliminating the need for an auxiliary winding. The TEA1998TS/1H sustains regulation and gate drive even when XV is grounded or tied to a low-voltage rail.

Can the TEA1998TS/1H drive both standard and logic-level SR MOSFETs?

Yes, the TEA1998TS/1H supports both standard and logic-level SR MOSFETs via configurable gate drive voltage. When the XV pin is grounded, the driver regulates to ~10 V for standard MOSFETs. When XV is connected to the converter output (e.g., 5 V), the gate drive is regulated to 4.9 V (typ), sufficient to fully enhance logic-level devices. The TEA1998TS/1H's 0.7 A source / 0.5 A sink capability ensures fast switching regardless of MOSFET type.

What protection features does the TEA1998TS/1H include?

The TEA1998TS/1H incorporates UnderVoltage LockOut (UVLO) with active gate pull-down, which forces the GATE pin low when CAP voltage drops below 3.6 V (typ), preventing partial MOSFET turn-on. It also features built-in minimum on-time (1.4 μs typ) to suppress false turn-off from ringing, and a 3 Ω gate pull-down resistor activated when drain voltage exceeds 250 mV post-turnoff. These protections ensure robust operation in noisy flyback environments.

Is the TEA1998TS/1H suitable for high-side synchronous rectification?

Yes, the TEA1998TS/1H is explicitly designed for high-side synchronous rectification. Its self-supply architecture enables operation without an auxiliary winding: the CAP capacitor is charged via the DRAIN pin during positive drain voltage phases. The dedicated SOURCE pin provides Kelvin sensing to reject PCB inductance errors, and the 60 V DRAIN rating accommodates high-side voltage transients. This makes the TEA1998TS/1H ideal for compact, high-efficiency high-side SR designs.