NXP Semiconductors TEA1993TS/1X

Overview

TEA1993TS/1X from NXP Semiconductors is a GreenChip synchronous rectifier (SR) controller IC for flyback switch-mode power supplies, featuring adaptive gate drive for maximum efficiency across all load conditions, drain sense capability up to 120 V, and self-supply operation for low-output-voltage or high-side rectification applications. It drives external SR MOSFETs on the secondary side to replace diodes in chargers, adapters, and USB PD-compliant power supplies.

For engineers reviewing the TEA1993TS/1X datasheet, TEA1993TS/1X pinout, TEA1993TS/1X application, or TEA1993TS/1X equivalent, key selection considerations include its TSOP6 (SOT457) package, 6-pin configuration with dedicated DRAIN/SOURCE sensing, UVLO with active gate pull-down, and support for both standard and logic-level SR MOSFETs in battery charging and high-efficiency flyback designs.

Technical Context

The TEA1993TS/1X implements a dual-sense architecture using separate DRAIN and SOURCE pins to monitor the SR MOSFET's V_DS, regulating conduction to maintain −37 mV differential during regulation phase and switching off when V_DS exceeds +300 mV. Its adaptive gate driver delivers 0.50 A source / 0.65 A sink current with programmable max gate voltage (4.2 V to 12.3 V) depending on XV pin configuration.

Startup is managed via CAP pin charging-either through DRAIN (when XV < 4.7 V) or via integrated diode (when XV > 4.7 V)-enabling self-supply operation without auxiliary windings. UnderVoltage LockOut activates below 3.6 V on CAP and includes active gate pull-down via 6.8 Ω internal resistance to ensure safe SR MOSFET turn-off.

Key Specifications

Pinout & Package

TSOP6 (SOT457) package: 6-lead plastic surface-mounted package per JEDEC SC-74 outline, 3.1 mm × 2.7 mm body, 0.95 mm pitch, 1.1 mm max height.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NCP4307DR2G and IRS21271PBF, the TEA1993TS/1X uniquely combines self-supply operation, programmable gate voltage via XV pin, and precision −37 mV V_DS regulation-enabling simpler, more efficient, and smaller-footprint SR designs in USB PD, battery charging, and high-side flyback applications.

Availability

TEA1993TS/1X is available at Aetrix Electronics and suitable for USB PD fast charging adapters, low-voltage battery chargers, and high-side rectified flyback power supplies requiring stable component supply, long-term lifecycle support, and consistent parametric performance.

Supply support for TEA1993TS/1X 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 electronics.

The TEA1993TS/1X belongs to NXP's GreenChip family of high-efficiency power conversion ICs, designed specifically to enable ultra-low no-load power, adaptive synchronous rectification, and simplified flyback SMPS designs for energy-conscious consumer and industrial power supplies.

FAQ

What is the function of the XV pin on the TEA1993TS/1X?

The XV pin on the TEA1993TS/1X selects the maximum gate driver output voltage: grounding XV sets VG(max) to 9 V for standard SR MOSFETs; connecting XV to 2 V or 5 V configures 4 V or 4.2 V output for logic-level devices. This pin also influences CAP pin charging behavior and enables self-supply operation in low-output-voltage applications. The TEA1993TS/1X uses XV voltage level to adapt gate drive strength and startup characteristics without external components.

How does the TEA1993TS/1X achieve self-supply operation in high-side rectification?

The TEA1993TS/1X achieves self-supply operation in high-side rectification by charging the external capacitor on the CAP pin through the DRAIN pin when the SR MOSFET is off and drain voltage rises. This eliminates the need for an auxiliary winding or separate bias supply. During conduction, the IC regulates the SR MOSFET using SOURCE and DRAIN inputs, while maintaining internal supply stability. The TEA1993TS/1X sustains this operation across output voltages down to 0 V, making it ideal for high-side configurations in telecom and PoE applications.

What is the purpose of separate SOURCE and DRAIN pins on the TEA1993TS/1X?

The separate SOURCE and DRAIN pins on the TEA1993TS/1X enable precise differential sensing of the SR MOSFET's V_DS while rejecting common-mode noise and PCB trace inductance errors. SOURCE must be connected directly to the MOSFET source terminal to avoid voltage drops from high dI/dt currents, ensuring accurate regulation to −37 mV. This architecture allows the TEA1993TS/1X to maintain stable synchronous rectification timing and gate drive even in high-frequency, high-current flyback converters where parasitic effects would otherwise cause mis-triggering.

Does the TEA1993TS/1X support both low-side and high-side SR MOSFET configurations?

Yes, the TEA1993TS/1X supports both low-side and high-side SR MOSFET configurations. In low-side mode, SOURCE connects to ground and DRAIN monitors the MOSFET drain. In high-side mode, SOURCE connects to the MOSFET source (floating node), and DRAIN senses the drain referenced to that node-enabled by the IC's differential sensing architecture and self-supply capability. The TEA1993TS/1X maintains identical regulation accuracy (−37 mV V_DS) and timing control (1.5 μs min on-time) in both configurations, as confirmed in Figures 3 and 11 of the official datasheet.

What is the typical no-load supply current of the TEA1993TS/1X?

The typical no-load supply current of the TEA1993TS/1X is below 200 μA in power-save operation with XV = 5 V, as specified in Section 2.1 and Table 6 of the datasheet. This ultra-low quiescent current directly contributes to compliance with stringent energy-efficiency standards such as DOE Level VI and EU CoC Tier 2. The TEA1993TS/1X achieves this by dynamically disabling non-essential circuitry during light-load conditions while retaining fast wake-up capability-ensuring rapid response when load increases.