Infineon Technologies ILD4035E6327HTSA1

Overview

ILD4035E6327HTSA1 from Infineon Technologies is a 350 mA step-down LED driver with integrated 400 mA MOSFET switch, operating from 4.5 V to 40 V input, delivering ±3 % LED current accuracy and up to 95 % efficiency in SC74-6 package for high-power LED lighting systems.

For engineers reviewing the ILD4035E6327HTSA1 datasheet, ILD4035E6327HTSA1 pinout, ILD4035E6327HTSA1 application, or ILD4035E6327HTSA1 equivalent, key selection criteria include hysteretic peak-current control architecture, internal thermal foldback protection, analog/PWM dimming compatibility, and open-circuit LED fault detection without external sensing components.

Technical Context

The ILD4035 implements a hysteretic peak-current-controlled buck topology with an internal N-channel MOSFET switch rated for 400 mA average current and 1.2 A peak. It uses a fixed-frequency-free switching scheme where on-time is determined by input voltage, output voltage, and inductor value - enabling stable regulation without external compensation.

Its temperature protection operates with sloped foldback (not flicker), reducing LED current linearly above 125 °C junction temperature until shutdown at 150 °C. Digital control at EN/PWM pin accepts 1.3 V–5.5 V logic levels and supports 100 Hz–20 kHz PWM dimming with 0.1 % minimum duty cycle.

Key Specifications

Pinout & Package

ILD4035E6327HTSA1 is housed in a thermally enhanced SC74-6 surface-mount package (3.0 mm × 1.7 mm × 0.9 mm) with exposed thermal pad for PCB heat sinking. Pin 1 (VS) and Pin 6 (Vsense) are electrically isolated; Pins 2 and 5 share GND connection for low-noise current-sense return path.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AL8862SP-13 and LM3409MYX/NOPB, ILD4035E6327HTSA1 delivers lower system-level component count, guaranteed open-circuit safety, and simplified thermal derating - making it optimal for cost-sensitive, space-constrained single-string LED modules where reliability and time-to-market are prioritized.

Availability

ILD4035E6327HTSA1 is available at Aetrix Electronics and suitable for retail downlighting, LED replacement lamps, architectural accent lighting, and office panel lighting requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for ILD4035E6327HTSA1 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

Infineon Technologies AG is a German semiconductor manufacturer specializing in power management, automotive, and industrial control ICs, with global manufacturing and quality certification to ISO 9001 and IATF 16949.

The ILD4035 belongs to Infineon's dedicated LED driver product line designed for high-efficiency, thermally robust constant-current regulation in mains-connected and DC-powered solid-state lighting systems - emphasizing integration, protection, and ease of qualification.

FAQ

What is the recommended inductor value for ILD4035E6327HTSA1 in a 24 V input, 12 V output, 350 mA application?

A 10 µH shielded power inductor with 1.2 A saturation current and ≤0.1 Ω DCR is recommended. This value balances ripple current (≈30 % of average), core loss, and physical size for typical 24 V → 12 V LED string configurations. Inductor selection must ensure peak current stays below 400 mA to avoid saturation-induced instability.

Does ILD4035E6327HTSA1 support analog dimming via DC voltage on the EN/PWM pin?

Yes - applying a DC voltage between 0.5 V and 1.2 V to the EN/PWM pin linearly scales the regulated LED current from 0 % to 100 %. Below 0.5 V the device shuts down; above 1.2 V it operates at full current unless modulated by PWM. No external resistor divider is needed for standard 0–10 V interface adaptation.

How does the open-circuit LED protection function without external components?

The ILD4035 monitors Vsense continuously. If no current flows (Vsense < 50 mV for >100 µs), the internal comparator disables switching and holds the Vswitch node low. Recovery occurs automatically after EN/PWM is toggled or input voltage cycles - no latch or external reset is required.

Can ILD4035E6327HTSA1 drive multiple parallel LED strings?

No - it is designed for single-string constant-current operation. Driving parallel strings would cause current imbalance due to forward-voltage mismatch, risking thermal runaway. For multi-string applications, use one ILD4035 per string or select a multi-channel driver such as the ILD8150.