LS2406ERQ23 - 24V/6A eFuse with True RCB & Fast Role Swap
Teilenummer: LS2406ERQ23 ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $2.7 | $2,70 |
| 10 | $2.45 | $24,50 |
| 100 | $2.1 | $210,00 |
| 500 | $1.85 | $925,00 |
| 1.000 | $1.62 | $1.620,00 |
LS2406ERQ23 Übersicht
An eFuse (semiconductor-based protection IC) is a solid-state replacement for traditional fuses and PTC resettable devices. It sits between a system power rail and its downstream load, monitoring current, voltage, and temperature and disconnecting the path when an abnormal condition is detected. eFuses belong to the broader hierarchy of power-path protection -> hot-swap controllers / load switches -> power-management ICs, and are preferred over fuses because they offer programmable thresholds, fast re-insertion, and telemetry flags for the host MCU.
Key features of the LS2406ERQ23 include an adjustable current limit up to 6 A set by an external resistor, true reverse-current blocking (RCB), a fast role swap (FRS) function compatible with the USB Power Delivery Specification timing, thermal fold-back, and over-temperature shutdown. The 24 mΩ on-resistance minimises I²R conduction loss during normal operation, improving efficiency in battery-powered and adapter-powered designs.
The device uses a low-side N-channel pass-FET topology with an integrated charge pump, allowing it to block current in both forward and reverse directions. Its programmable soft-start and inrush-current limiting protect upstream sources from load-step transients, and the FLAG/PGOOD pin provides real-time fault telemetry. The 16-QFN package offers a low thermal resistance path, suitable for 6 A continuous operation with adequate PCB copper.
Typical applications include USB Type-C / USB PD source and sink ports, notebook and tablet charging subsystems, hot-swap bay protection in industrial PCs, multi-port wall adapters, and any 5 V to 20 V rail that must survive hot-plug events and unexpected reverse-current injection.
When designing with the LS2406ERQ23, size the input and output capacitors per the datasheet to suppress transient ringing during fast role-swap events. Ensure sufficient copper area beneath the exposed pad to keep junction temperature below the thermal fold-back threshold at worst-case VIN and IOUT.
This page synthesizes distributor pricing, same-brand and cross-brand drop-in alternatives, and practical PCB-layout design notes that go beyond the manufacturer datasheet, helping engineers shortlist a validated protection IC for USB PD and hot-swap designs.
Drop-in-Alternativen für LS2406ERQ23 – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
LS2406ER23
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
LS2406ERQ23 Technische Daten
| Product Type | Electronic Fuse (eFuse) / Current Limit Switch |
| Manufacturer | Littelfuse Inc. |
| Input Voltage Range (Max) | 28 V |
| Continuous Current Rating | 6 A |
| On-Resistance RDS(ON) | 24 mΩ (typical) |
| Strombegrenzung | Adjustable up to 6 A (external resistor) |
| Reverse Current Blocking | True RCB, all-time regardless of EN state |
| Fast Role Swap (FRS) | USB PD compliant timing |
| Over-Temperature Protection | Thermal fold-back + shutdown |
| Fault Protections | Overload, short-circuit, input surge, inrush, OTP, RCB |
| Gehäuse | 16-QFN (2.5 x 3.2 mm) |
| Montageart | Surface Mount |
| RoHS-Status | Compliant (per Littelfuse product page) |
| Lead-Free | Yes |
| Topologie | Low-side N-channel pass FET with charge pump |
| Enable-Pin | Yes (EN, active-high per datasheet conventions) |
| Fault Output | FLAG / PGOOD pin (per datasheet naming) |
LS2406ERQ23 Pin-Konfiguration
| Pin 1 | VIN — Input supply to the power switch |
| Pin 2 | VIN — Input supply (parallel pin for high current) |
| Pin 3 | EN — Enable input, active high |
| Pin 4 | ILIM — Current limit set resistor to GND |
| Pin 5 | GND — Ground |
| Pin 6 | FLAG — Fault indicator output, open-drain |
| Pin 7 | NC — Not connected (per datasheet) |
| Pin 8 | NC — Not connected (per datasheet) |
| Pin 9 | VOUT — Switched output to the load |
| Pin 10 | VOUT — Switched output (parallel pin for high current) |
| Pin 11 | VOUT — Switched output (parallel pin for high current) |
| Pin 12 | VOUT — Switched output (parallel pin for high current) |
| Pin 13 | NC — Not connected (per datasheet) |
| Pin 14 | NC — Not connected (per datasheet) |
| Pin 15 | PGND — Power ground |
| Pin 16 | EP — Exposed thermal pad, connect to GND plane |
Typische Anwendungen
LS2406ERQ23 ist geeignet für 6 Anwendungs: USB Type-C / PD Charging Port Protection, Notebook / Tablet DC-In Hot-Swap, Industrial Hot-Swap / Plug-in Card Protection, Multi-Port Wall Adapter Output Protection, Battery Sharing / OR-ing Protection, LED Driver / Lighting Rail Protection.
USB Type-C / PD Charging Port Protection
The LS2406ERQ23's 28 V/6 A rating and USB PD Fast Role Swap support make it a strong fit for USB Type-C source and sink ports. Its true reverse-current blocking prevents backfeed from a partner device during roleswap, while the 24 mΩ RDS(ON) limits conduction loss to roughly 0.86 W at 6 A. Place the IC between the connector VBUS pins and the downstream PD controller; compared with a PTC + TVS discrete solution, it adds programmable current limit, fault FLAG output, and clean thermal fold-back in a single 16-QFN footprint.
Empfohlen
Notebook / Tablet DC-In Hot-Swap
At the DC barrel or USB-C input of a notebook, the LS2406ERQ23 limits inrush when a hot adapter is plugged in and isolates the downstream 5 V/20 V rail from a shorted cable. With adjustable current limit up to 6 A and thermal fold-back, it tolerates the worst-case adapter turn-on transient. The QFN exposed pad allows direct thermal coupling to the inner ground plane; versus a discrete P-channel MOSFET + sense resistor design, the LS2406ERQ23 saves BOM area and adds fault telemetry to the embedded controller.
Empfohlen
Industrial Hot-Swap / Plug-in Card Protection
Industrial PCs and plug-in I/O cards often need protection against inrush at card insertion and accidental reverse polarity. The LS2406ERQ23's all-time reverse-current blocking and adjustable current limit let the same 16-QFN footprint protect a 12 V or 24 V field rail at 6 A. Designers typically use the FLAG pin to drive a supervisory MCU; compared with a traditional PolySwitch PTC, the eFuse offers faster reaction, no resettable cool-down delay, and precise threshold programming via a single ILIM resistor.
Empfohlen
Multi-Port Wall Adapter Output Protection
A 60-100 W multi-port USB-PD adapter needs per-port eFuse protection to prevent a short on one port from collapsing the shared internal 20 V rail. The LS2406ERQ23's 6 A continuous rating covers 100 W PD output, its true RCB prevents port-to-port backfeed, and FRS compliance supports roleswap on dual-role ports. Mount each IC on its own 16-QFN footprint with adequate copper; versus an SMBJ TVS + fuse approach, it offers reusable, programmable protection with no user-replaceable parts.
Empfohlen
Battery Sharing / OR-ing Protection
Where two batteries or a battery plus adapter share a downstream rail, the LS2406ERQ23 acts as a low-loss OR-ing switch thanks to its true reverse-current blocking regardless of EN state. With 24 mΩ RDS(ON) it dissipates only ~0.43 W at 3 A, much lower than a Schottky diode OR. The all-time RCB guarantees that a falling source cannot back-charge into the live source; this is critical for USB PD dual-battery tablets and small UPS boards.
Empfohlen
LED Driver / Lighting Rail Protection
Long LED strings and outdoor lighting rails can short to the frame under fault conditions. Placing the LS2406ERQ23 upstream of the LED driver limits the short-circuit current to a programmable value and folds back thermally before the cable or driver is damaged. Its 28 V rating covers 24 V LED bus rails with margin; the 16-QFN package is small enough for in-fixture integration. Compared with a glass-tube fuse, the eFuse auto-recovers once the fault clears and provides a fault flag for remote diagnostics.
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Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für LS2406ERQ23 – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | LS2406ER23 |
|---|---|---|
| Brand | Littelfuse | Littelfuse |
| Package | 16-QFN (2.5 x 3.2 mm) | 16-QFN (2.5 x 3.2 mm) - same |
| Input Voltage (Max) | 28 V | 28 V |
| Continuous Current | 6 A | 6 A |
| RDS(ON) | 24 mΩ | 24 mΩ |
| True Reverse-Current Blocking | Yes (all-time) | Yes (all-time) |
| USB PD Fast Role Swap | Yes | Yes |
| Thermal Fold-back | Yes | Yes |
| Reel / Packaging Suffix | Q23 | 23 |
Wichtigste Unterscheidungsmerkmale
- Integrated USB PD Fast Role Swap function (vs. Generic eFuse without FRS support)
- All-time true reverse-current blocking regardless of EN state (vs. Conventional load switches that only block reverse current when enabled)
- 24 mΩ ultra-low RDS(ON) in a 16-QFN 2.5 x 3.2 mm package (vs. Larger eFuse ICs in 4 x 4 mm QFN or TSSOP packages)
Designhinweise
Estimated: at 6 A continuous through the 24 mΩ switch, conduction loss is I²R ≈ 36 × 0.024 ≈ 0.86 W. With the 16-QFN exposed pad soldered to a 100 mm² top-layer copper pour on 1 oz copper and an inner ground plane, junction-to-ambient thermal resistance is typically below 40 C/W, so junction rise stays well under 35 C at room ambient. Add thermal vias under the EP for stacked boards; without the EP connected, the device will fold back at much lower currents.
Place input and output ceramic capacitors within 2 mm of the VIN and VOUT pads to suppress transient ringing during Fast Role Swap events. A 10 µF X7R at VIN and a 22 µF X7R at VOUT are typical starting values per the Littelfuse datasheet. Keep the ILIM resistor trace short and away from the VOUT switching node to avoid ground-noise coupling into the current-limit comparator, which could cause nuisance tripping at high di/dt.
Do not exceed 28 V on VIN; the device's absolute maximum is 28 V per the Littelfuse datasheet and any spike above this can permanently damage the internal pass FET. Always tie the exposed pad to a solid ground plane - an unconnected EP causes severe self-heating and premature thermal fold-back. The FLAG pin is open-drain and needs a pull-up to the logic rail; do not leave it floating if your MCU expects a deterministic fault signal.
Route VIN and VOUT as wide copper pours (at least 1 oz, preferably 2 oz) to handle the 6 A continuous rating without excessive voltage drop. Keep the EN and FLAG traces short and routed away from the VOUT switching node. For USB PD designs, place the LS2406ERQ23 as close as possible to the Type-C connector VBUS pins to minimise the protected copper length and to maximise the effectiveness of its surge protection.
Compliance-Informationen
RoHS and lead-free per Littelfuse product page. AEC-Q100 not advertised, so the device is treated as industrial/commercial grade; halogen-free and full conflict-minerals status were not confirmed in the provided web data and are marked 'unknown'.
