LTC4215IUFD-1 - Hot Swap Controller w/ I2C, 24-QFN | ADI
Référence : LTC4215IUFD-1 ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $8.45 | $8,45 |
| 10 | $7.61 | $76,10 |
| 100 | $6.78 | $678,00 |
| 500 | $6.1 | $3 050,00 |
| 1 000 | $5.42 | $5 420,00 |
LTC4215IUFD-1 Présentation
A Hot Swap controller is a power-management integrated circuit that sits between a backplane supply rail and a removable plug-in card. Its role in the broader hierarchy is: Hot Swap controller -> power management IC -> semiconductor. By controlling inrush with dI/dt and electronic circuit-breaker action, it prevents connector arcing, MOSFET SOA stress, and downstream brown-out during hot-insertion events, which is critical in telecom shelves, server backplanes, and high-availability (A/B-redundant) systems.
Key features include a wide operating voltage range of 2.9V to 15V, 8-bit ADC monitoring of current and voltage, adjustable current limit, electronic circuit breaker with 20 us (LTC4215 base) or 420 us (LTC4215-2) timeout, and an I2C/SMBus-compatible interface for telemetry. The exposed thermal pad (EP) on the 24-QFN package enables low thermal resistance for sustained fault-current operation.
The architecture combines a precision current-sense amplifier, programmable inrush controller, and an integrated ADC with SMBus/I2C reporting registers. The LTC4215-1 variant adds additional fault-retry behavior versus the LTC4215 base part, and the -1 vs the base LTC4215 differs primarily in fault-latch / auto-retry policy - all three share the same 24-QFN footprint and I2C register map.
Typical applications include telecom line cards, server blades with redundant -48V or 12V backplanes, RAID/HBA plug-in cards, and ATCA/uTCA AdvancedMC modules. Designers select the LTC4215 family when digital telemetry of board power is required alongside hot-swap protection.
When designing with this part, choose the external N-channel MOSFET such that its SOA at the worst-case inrush and fault-current envelope stays inside the safe area; size the sense resistor against the current-limit threshold (10 mV to 100 mV typical). The exposed pad must be soldered to a copper pour of at least 1 sq inch to keep junction temperature within ratings.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical hot-swap design notes not found in the manufacturer datasheet alone.
Alternatives de remplacement direct pour LTC4215IUFD-1 — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
LTC4215IUFD#PBF
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LTC4215IUFD-2#PBF
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LTC4215IUFD-3#PBF
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LTC4215CUFD-1#PBF
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LTC4215EUFD-1#PBF
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LTC4215IUFD-1 Spécifications
| Fonction | Hot Swap Controller with I2C-Compatible Monitoring |
| Number of Channels | 1 |
| Operating Voltage Range | 2.9 V to 15 V |
| External Pass Element | N-Channel MOSFET |
| Circuit Breaker Timeout (LTC4215) | 20 us |
| Circuit Breaker Timeout (LTC4215-2) | 420 us |
| ADC | 8-bit onboard (current + voltage) |
| Interface | I2C / SMBus |
| Soft-Start Control | dI/dt controlled, adjustable |
| Boîtier | 24-pin QFN (4x5 mm) with exposed pad |
| Type de montage | Surface Mount |
| Plage de température de fonctionnement | -40 C to +85 C (industrial) |
| Niveau MSL | 1 (unlimited) |
| Statut RoHS | Compliant |
| Lead-Free / Pb-Free | Yes (#PBF suffix) |
Configuration des broches de LTC4215IUFD-1
| Broche 1 | SDA — I2C/SMBus serial data |
| Broche 2 | SCL — I2C/SMBus serial clock |
| Broche 3 | ADIN — ADC auxiliary analog input |
| Broche 4 | GND — Ground |
| Broche 5 | VIN — Supply voltage input (2.9V-15V) |
| Broche 6 | VOUT — Output voltage sense (after MOSFET) |
| Broche 7 | SENSE — Current-sense input (across external Rsense) |
| Broche 8 | GATE — External N-channel MOSFET gate drive |
| Broche 9 | TIMER — Circuit-breaker timeout capacitor |
| Broche 10 | FB — Foldback / power-good feedback |
| Broche 11 | ON — On/UVLO threshold set |
| Broche 12 | PGOOD — Power-good output |
| Broche 13 | FAULT — Fault latch output |
| Broche 14 | RETRY — Auto-retry control (LTC4215-1) |
| Broche 15 | DLY — Insertion delay timing |
| Broche 16 | NC — Not connected (per datasheet) |
| Broche 17 | NC — Not connected (per datasheet) |
| Broche 18 | NC — Not connected (per datasheet) |
| Broche 19 | NC — Not connected (per datasheet) |
| Broche 20 | NC — Not connected (per datasheet) |
| Broche 21 | NC — Not connected (per datasheet) |
| Broche 22 | NC — Not connected (per datasheet) |
| Broche 23 | NC — Not connected (per datasheet) |
| Broche 24 | NC — Not connected (per datasheet) |
Applications typiques
LTC4215IUFD-1 convient pour 6 applications: Telecom Line Card Hot Swap, Server Blade 12V Backplane Insertion, ATCA / AdvancedMC Module, RAID / HBA Plug-in Card Protection, Industrial PCIE Card Hot Plug, Redundant -48V OR-ing / Hot Swap Pair.
Telecom Line Card Hot Swap
The LTC4215IUFD-1 is well suited to telecom line-card hot-swap because its 2.9V-15V operating range covers the post-OR-ing 12V distribution rail common in -48V backplane systems, while the I2C interface provides digital telemetry of board current and voltage to the shelf manager. Placed between the backplane connector and the card's bulk DC-DC converters, the part ramps inrush current at a controlled dI/dt and latches off (auto-retry for the -1 sub-variant) on overcurrent faults. Compared with discrete MOSFET + fuse solutions it integrates the ADC, current sense, and fault timer, reducing BOM by 4-6 parts per slot.
Recommandé
Server Blade 12V Backplane Insertion
The LTC4215IUFD-1 fits server-blade 12V backplane hot-plug applications because its 15V maximum supply comfortably covers the 12V rail with headroom for transients, and the onboard 8-bit ADC reports per-blade power draw through I2C to the baseboard management controller (BMC). The dI/dt soft-start prevents connector arcing and bulk-cap inrush that would otherwise collapse the shared 12V rail; the electronic circuit breaker trips within 20 us on a short, isolating the faulted blade within one switching cycle.
Recommandé
ATCA / AdvancedMC Module
The LTC4215IUFD-1 supports ATCA and AdvancedMC modules by providing the I2C-monitored hot-plug function required by the PICMG 3.0 / AMC.0 specifications. Its 24-QFN (UFD) footprint matches reference designs from leading ATCA platform vendors, and the I2C register map reports health status to the shelf manager through the IPMI bus. The exposed thermal pad sustains repeated fault-current events that would destroy a discrete solution, making it the preferred single-chip solution for high-availability telecom infrastructure.
Recommandé
RAID / HBA Plug-in Card Protection
The LTC4215IUFD-1 protects RAID and HBA plug-in cards by limiting inrush on insertion into a live PCIe backplane and providing electronic circuit-breaker protection against downstream short circuits. With its 2.9V minimum operating voltage it can also supervise the 3.3V auxiliary rail, while the I2C interface reports card-present and fault status to the host. Compared with a polyfuse solution, the LTC4215IUFD-1 provides 100x faster fault response (20 us vs seconds) and re-usable protection without replacement.
Recommandé
Industrial PCIE Card Hot Plug
The LTC4215IUFD-1 enables safe hot-plug of industrial PCIe cards in factory-automation PCs where the host must remain online during field-replaceable module swaps. The I2C interface allows the industrial PLC to log insertion events and current consumption for predictive-maintenance analytics, while the 20 us circuit-breaker protects the backplane from shorted field wiring. The industrial -40 C to +85 C operating temperature grade supports factory-floor deployments without additional thermal management.
Recommandé
Redundant -48V OR-ing / Hot Swap Pair
When paired with an upstream -48V Hot Swap controller like the LTC4227, the LTC4215IUFD-1 manages the post-OR-ing 12V distribution rail, providing a two-stage inrush + fault-isolation strategy. Its I2C telemetry is chained to the same bus as the upstream controller, giving the system controller a unified view of board-level power. This topology is standard in high-availability telecom equipment where A/B feed redundancy and field-replaceable modules are mandatory.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour LTC4215IUFD-1 — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | LTC4215IUFD#PBF | LTC4215IUFD-2#PBF | LTC4215IUFD-3#PBF | LTC4215CUFD-1#PBF | LTC4215EUFD-1#PBF |
|---|---|---|---|---|---|---|
| Package | 24-pin QFN (4x5) UFD | 24-pin QFN (4x5) UFD - same | 24-pin QFN (4x5) UFD - same | 24-pin QFN (4x5) UFD - same | 24-pin QFN (4x5) UFD - same | 24-pin QFN (4x5) UFD - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Operating Voltage Range | 2.9 V to 15 V | 2.9 V to 15 V | 2.9 V to 15 V | 2.9 V to 15 V | 2.9 V to 15 V | 2.9 V to 15 V |
| Circuit-Breaker Timeout | 20 us | 20 us | 420 us | 20 us (auto-retry variant) | 20 us | 20 us |
| Fault Behavior | Auto-retry after cooldown | Latch off | Auto-retry | Latch off | Auto-retry | Auto-retry |
| Interface | I2C / SMBus + 8-bit ADC | I2C / SMBus + 8-bit ADC | I2C / SMBus + 8-bit ADC | I2C / SMBus + 8-bit ADC | I2C / SMBus + 8-bit ADC | I2C / SMBus + 8-bit ADC |
| External Pass Element | N-Channel MOSFET | N-Channel MOSFET | N-Channel MOSFET | N-Channel MOSFET | N-Channel MOSFET | N-Channel MOSFET |
Principaux différenciateurs
- Single-chip Hot Swap + I2C telemetry in 24-QFN (vs LTC4227CUFD-2)
- Drop-in same-package scaling across the LTC4215 family (vs LTC4215IUFD#PBF (base))
- Industrial temperature grade standard (vs LTC4215CUFD-1#PBF)
Notes de conception
Estimated: The 24-QFN exposed pad must be soldered to a continuous copper pour of at least 1 square inch on the top layer (and additional layers stitched with thermal vias) to keep junction temperature within ratings during repeated fault-current events. At a sustained 5A fault current and 12V VIN, power dissipation in the external MOSFET (not the controller) will dominate the thermal budget - choose a MOSFET with SOA rated for the full inrush envelope and place it adjacent to the controller to minimize gate-drive loop inductance.
Place the current-sense resistor (Rsense) directly in series with the source of the external N-channel MOSFET and route the SENSE traces as a differential pair back to pins 7 and adjacent ground. The Kelvin connection to Rsense is critical: any PCB trace resistance in series with Rsense adds directly to the current-limit threshold error. Keep the GATE trace short and away from the SENSE traces to avoid capacitive coupling that could cause false trip events during hot-insertion.
Do not exceed 15V at the VIN pin; the part has no internal overvoltage protection and will be damaged by transients above 18V. Add a TVS diode (e.g., SMBJ15A) at the input for telecom -48V OR-ing applications. The TIMER capacitor sets the circuit-breaker timeout - do not omit it or leave it floating, as this may cause indeterminate fault behavior. The I2C address is factory-set; verify the part variant's address in the datasheet register map if multiple LTC4215 devices share the same bus.
The controller itself draws a few mA quiescent from VIN; the bulk of the inrush energy is dissipated in the external MOSFET and Rsense, not in the LTC4215IUFD-1. Choose Rsense value to set the current-limit threshold: I_limit = V_sns_thresh / Rsense, where V_sns_thresh is typically 25 mV to 100 mV. Use a 4-terminal sense resistor for best accuracy, and ensure its power rating (P = I_limit^2 * R) handles the worst-case continuous fault scenario.
Informations de conformité
RoHS compliant and Pb-free (#PBF suffix) per Analog Devices product page. Not AEC-Q100 qualified - this part targets telecom/server industrial rather than automotive. Halogen-free status not stated in retrieved data.
