Texas Instruments TPS54200DDCT

Overview

TPS54200DDCT from Texas Instruments is a 1.5-A synchronous buck LED driver IC designed for mono-color or infrared LED arrays, featuring 4.5–28-V input range, integrated 150-mΩ high-side and 70-mΩ low-side MOSFETs, fixed 600-kHz switching frequency, and dual dimming modes (analog and PWM) with 200-mV/100-mV feedback reference selection. It delivers precise current regulation in IP network cameras and night vision systems.

For engineers reviewing the TPS54200DDCT datasheet, TPS54200DDCT pinout, TPS54200DDCT application, or TPS54200DDCT equivalent, key selection criteria include shutdown-and-latch protection mode, 2-μA quiescent current in shutdown, LED-open/short and sense-resistor fault detection, and SOT-23-THIN (6-pin) package compatibility with space-constrained IR illumination designs.

Technical Context

The TPS54200DDCT employs peak-current-mode control with internal slope compensation to ensure stable operation across 1%–100% PWM dimming duty cycles. Its error amplifier uses transconductance of 240 μA/V and integrates frequency compensation, eliminating external compensation components.

It implements cycle-by-cycle high-side current limiting (2.4–3.6 A in PWM dimming mode), low-side sink/source current limits (1.25–4.4 A), and dedicated protection logic for LED open/short, sense-resistor faults, and thermal shutdown at 150°C with 10°C hysteresis.

Key Specifications

Pinout & Package

SOT-23-THIN (6-pin) package with 1.6 mm × 2.9 mm body size and 0.95 mm height; optimized for thermal performance (R_θJA = 89.2°C/W) and high-density LED driver layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LED driver applications.

Compared with TPS54200DDCT, TPS54201DDCT offers identical performance with auto-retry recovery, while LM3409QMHX/NOPB trades integration for design flexibility-neither is pin-compatible, and both require layout and BOM changes.

Availability

TPS54200DDCT is available at Aetrix Electronics and suitable for IP network cameras, analog security camera night vision, and video doorbell illumination requiring stable component supply and long-term production continuity.

Supply support for TPS54200DDCT 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 technologies with over 90 years of innovation in industrial, automotive, and consumer electronics.

The TPS54200 product line delivers highly integrated, thermally efficient LED drivers for mono-color and IR illumination, targeting compact, high-reliability vision systems where board space and fault tolerance are critical.

FAQ

What dimming modes does the TPS54200DDCT support, and how do they differ?

The TPS54200DDCT supports analog dimming (ADIM) and PWM dimming (PDIM). In ADIM mode, the internal reference voltage scales linearly with PWM input duty cycle (1–100%), enabling smooth brightness control with 200-mV FB reference. In PDIM mode, the reference drops to 100 mV and the LED is switched fully ON/OFF per PWM cycle-improving efficiency at low brightness. The TPS54200DDCT automatically selects mode based on PWM pin voltage thresholds (≥2.07 V for ADIM, ≤1.1 V for PDIM).

How does the TPS54200DDCT handle LED open-circuit faults?

The TPS54200DDCT detects LED open-circuit conditions via loss of feedback voltage at the FB pin. When FB rises above 1 V (indicating no current flow through the sense resistor), the device triggers open-loop protection and enters shutdown-and-latch mode-halting switching and holding the output disabled until VIN is cycled. This behavior is intrinsic to the TPS54200DDCT and differs from the auto-retry mode of TPS54201DDCT.

What is the minimum recommended input voltage for reliable operation of the TPS54200DDCT?

The TPS54200DDCT has a VIN undervoltage lockout (UVLO) threshold of 3.7 V typical, with 470 mV hysteresis. Reliable operation begins at 4.5 V, the lower limit of its recommended operating range. Below 4.5 V, the device may not sustain regulation or deliver full 1.5-A output; operation below 3.7 V disables the IC entirely. This ensures stable startup and avoids brownout-induced instability in the TPS54200DDCT.

Can the TPS54200DDCT drive multiple LED strings in parallel?

No-the TPS54200DDCT is designed for single-string constant-current operation using one external sense resistor. Driving parallel LED strings without individual current regulation risks current imbalance due to V_f mismatch, potentially causing thermal runaway. For multi-string applications, separate TPS54200DDCT channels or a matrix-driver architecture with per-string sensing is required to maintain reliability and compliance with IEC 62368-1.

What thermal metrics define the TPS54200DDCT's power dissipation capability?

The TPS54200DDCT specifies R_θJA = 89.2°C/W (junction-to-ambient), R_θJB = 14.7°C/W (junction-to-board), and ψ_JB = 14.7°C/W. These values assume JEDEC-standard 2-layer board construction. With proper copper pour and thermal vias under the exposed pad (GND), the TPS54200DDCT sustains 1.5-A output at 125°C junction temperature-validated per JEDEC JESD51-2 testing methodology.