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Renesas ZL2105ALNFT
- Part No.:
- ZL2105ALNFT
- Manufacturer:
- Renesas
- Package:
- 36-VFQFN Exposed Pad
- Datasheet:
-
ZL2105ALNFT.pdf
- Description:
- IC REG BUCK PROG 3A 36QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,483
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Product details
Overview
ZL2105ALNFT from Intersil (now Renesas) is a digitally controlled, integrated synchronous buck DC-DC converter with embedded PMBus-compliant power management. It delivers up to 3 A continuous output current from 4.5 V–14 V input, supports 0.54 V–5.5 V programmable output voltage with ±1% accuracy, and integrates dual 4.5 A N-channel MOSFETs in a 6 × 6 mm QFN-36 package. It is used in point-of-load regulation for telecom, storage, and industrial 12 V distributed systems.
For engineers reviewing the ZL2105ALNFT datasheet, ZL2105ALNFT pinout, ZL2105ALNFT application, or ZL2105ALNFT equivalent, key selection criteria include its digital soft-start/stop, voltage tracking & sequencing, thermal monitoring with shutdown, non-volatile memory configuration, and SMBus/PMBus interface for real-time telemetry and fault logging in multi-rail power systems.
Technical Context
The ZL2105ALNFT implements a voltage-mode synchronous buck architecture with a digital PWM controller combining analog sensing (fast ADC on VSEN) and digital compensation. Its internal PLL enables switching frequency tuning from 200 kHz to 2 MHz, with phase spreading support to reduce input/output ripple and system capacitance requirements.
Power management functions-including UVLO (3.79–13.2 V), programmable PG delay (0–500 s), margining (via MGN), tracking (VTRK), and overcurrent protection (peak limit 0.2–4.5 A)-are configurable via multi-mode pins or PMBus commands. All settings persist in on-chip non-volatile memory (NVM), enabling one-time configuration without host intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3 A continuous - supports full-rated load without external current-sense resistors or heatsinking in typical 12 V→3.3 V PoL applications. |
| Input Voltage Range | 4.5 V to 14 V - compatible with standard 5 V, 12 V, and wide-range industrial rails; no auxiliary bias supply required. |
| Output Voltage Range | 0.54 V to 5.5 V - covers core logic (0.6–1.2 V), I/O (1.8–3.3 V), and analog (5 V) rails; includes ±10% margining capability. |
| Switching Frequency | 200 kHz to 2 MHz - adjustable via SYNC pin or PMBus; higher frequencies enable smaller magnetics and reduced footprint. |
| Voltage Accuracy | ±1% over line/load/temperature - ensures stable regulation for sensitive ASIC/FPGA cores without external calibration. |
| Thermal Shutdown Threshold | Configurable from −40°C to 125°C - factory default at 125°C with 15°C hysteresis, preventing thermal runaway in enclosed enclosures. |
| PMBus Compliance | Fully compliant with PMBus v1.1 - supports standard commands (READ_VOUT, READ_IOUT, CLEAR_FAULTS, STORE_DEFAULT_ALL) for seamless integration into system-level power managers. |
Pinout & Package
The ZL2105ALNFT is housed in a thermally enhanced 6 mm × 6 mm QFN-36 package with exposed thermal pad (ePad) connected internally to SGND. The package supports high-power dissipation (ΘJC = 5°C/W) and requires soldering the ePad to a low-impedance ground plane using multiple vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DGND (Pin 1) | Digital ground reference | Return path for logic signals; must be isolated from PGND except at single-point SGND connection to minimize noise coupling. |
| SYNC (Pin 2) | Frequency synchronization I/O | Accepts external clock (200 kHz–2 MHz) or outputs synchronized PWM; defaults to push-pull mode for master-slave phase spreading. |
| VSEN (Pin 15) | Output voltage sense input | High-impedance feedback node (100–200 µA bias); connects directly to output capacitor for accurate regulation and remote sensing. |
| PG (Pin 36) | Power good open-drain output | Asserts high ≥100 ms after VOUT stabilizes within ±10% of setpoint; drives reset logic or enables downstream rails in sequenced systems. |
| EN (Pin 35) | Enable control input | Active-high logic input (VIH ≥ 2.0 V); enables full converter operation and initiates soft-start sequence upon assertion. |
| SW (Pins 22,23) | Switching node | Drives external inductor; connects to internal high-side and low-side MOSFETs; requires low-inductance layout to minimize EMI and ringing. |
| ePad (SGND) | Thermal & analog ground | Internal connection to analog ground (SGND); mandatory thermal path to PCB ground plane; improves thermal performance and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Digital soft-start/stop | Configurable delay (7 ms–500 s) and ramp (0–200 ms) via DLY/SS pins or PMBus - prevents inrush current and enables controlled power-up/down across multi-rail systems. |
| Voltage tracking & sequencing | VTRK pin accepts external reference; supports precise ramp alignment between multiple ZL2105ALNFT units or other rails - essential for FPGA/CPU core-I/O sequencing. |
| Non-volatile memory (NVM) | Stores all pin-strap and PMBus-configured parameters (VOUT, UVLO, OCP, thermal thresholds) - eliminates boot-time reconfiguration and supports field updates. |
| Integrated MOSFET drivers | Internal 4.5 A drivers with bootstrap (BST) and charge pump (CP1/CP2) support - enables efficient 5 V or 12 V gate drive without external level-shifters or gate drivers. |
| Real-time telemetry | Monitors VOUT, IOUT, temperature (XTEMP + internal sensor), and fault status via PMBus - provides actionable diagnostics without adding external ADCs or sensors. |
Applications
| Telecom Line Cards | Distributed Storage Arrays |
|---|---|
|
Use Scenario: Regulating 1.2 V core and 3.3 V I/O rails for multi-core DSPs and SERDES transceivers on high-density line cards with strict thermal limits. IC Role / Device Role / Timing Role: Primary point-of-load regulator with digital sequencing, margining, and thermal telemetry - replaces discrete controllers + MOSFETs + monitoring ICs. Use Value: Reduces BOM count by 7+ components per rail while enabling remote firmware-adjustable voltage margins for aging compensation and yield optimization. |
Use Scenario: Powering SAS/SATA SSD controllers and buffer memory in 1U rack-mounted storage enclosures where airflow is constrained. IC Role / Device Role / Timing Role: High-efficiency 12 V→1.8 V/3.3 V converter with thermal shutdown and PG signaling - coordinates safe power-down during hot-swap events. Use Value: Maintains ±1% output accuracy across −40°C to +85°C ambient, eliminating need for external trimming and reducing qualification test cycles. |
| Industrial PLC CPU Modules | Test & Measurement Equipment |
|
Use Scenario: Delivering clean, sequenced 5 V, 3.3 V, and 1.8 V supplies to ARM-based PLC processors and isolated I/O interfaces in electrically noisy factory environments. IC Role / Device Role / Timing Role: Digitally managed power subsystem with UVLO hysteresis tuning (0–100%), EMI-reduced phase spreading, and fault logging via SMBus. Use Value: Survives 12 V input transients up to 17 V and provides deterministic response to brownouts - critical for fail-safe control logic uptime. |
Use Scenario: Providing ultra-stable 2.5 V reference and 5 V analog supply for precision ADCs/DACs in benchtop oscilloscopes and signal generators. IC Role / Device Role / Timing Role: Low-noise, low-drift regulator with dedicated V25 LDO output and VSEN feedback - minimizes PSRR-induced measurement error. Use Value: Achieves <100 µVpp output ripple (typ.) and ±0.025% FS setpoint resolution via PMBus - meets Class A metrology-grade stability requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digitally managed buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS546D24A (Texas Instruments) | Higher 10 A rating, 0.5 V–5.5 V output, supports AVS via PMBus; no integrated NVM; requires external current-sense resistor. | Better suited for high-current CPU/GPU rails; lacks self-contained configuration persistence - needs host MCU for startup setup. | Select when >3 A output or AVS dynamic voltage scaling is required; accept added complexity for scalability. |
| ISL68224 (Renesas, formerly Intersil) | 4-phase, 40 A capable; same Digital-DC architecture and PMBus stack; larger 7×7 mm QFN-48; supports multiphase current sharing. | Designed for server VR13/IMVP8 CPU power delivery; not drop-in - requires multi-phase layout, different pinout, and updated firmware. | Select for scalable, multi-phase designs where ZL2105ALNFT's single-phase 3 A is insufficient; leverage shared toolchain and GUI compatibility. |
Compared with TPS546D24A and ISL68224, the ZL2105ALNFT offers the smallest footprint and fastest time-to-operation due to on-chip NVM and zero-external-component configuration, making it optimal for space-constrained, single-rail PoL applications where autonomous startup and field-updatable settings are prioritized over raw current capacity or multiphase scalability.
Availability
ZL2105ALNFT is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and test equipment requiring stable component supply, long-term lifecycle assurance, and traceable sourcing from authorized channels.
Supply support for ZL2105ALNFT 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
Renesas Electronics Corporation acquired Intersil in 2017 and maintains full support for the Zilker Labs Digital-DC product family, including design tools, GUI software, and technical documentation.
The ZL2105ALNFT belongs to the Digital-DC™ series designed specifically for intelligent, self-configuring point-of-load power delivery in high-density, thermally constrained systems where digital telemetry and autonomous operation are critical.
FAQ
What is the recommended input capacitor for ZL2105ALNFT in a 12 V input application?
A minimum 100 µF low-ESR aluminum or polymer input capacitor is recommended for ZL2105ALNFT in 12 V applications, placed as close as possible to VIN and PGND pins. This value satisfies ripple current handling and ensures stable operation under 3 A load steps. Layout best practices require short, wide traces between CIN, PGND, and SW nodes to minimize loop inductance and EMI generation. The ZL2105ALNFT datasheet Figure 3 shows a validated 100 µF/16 V design example.
Does ZL2105ALNFT support output voltage margining, and how is it implemented?
Yes, ZL2105ALNFT supports ±5% output voltage margining via the MGN pin and PMBus commands. When MGN is asserted high, the output voltage shifts by a user-defined offset stored in NVM - typically ±1%, ±2.5%, or ±5% of nominal VOUT. This feature enables in-system validation of supply tolerance margins for ASICs and FPGAs without hardware changes. The ZL2105ALNFT retains margining settings across power cycles due to its non-volatile memory.
Can ZL2105ALNFT operate from a 3.3 V standby supply, and what pins are involved?
Yes, ZL2105ALNFT can operate from a 3.3 V standby supply applied to VDDL (Pin 29) while main input (VDDS) is inactive. In this mode, the device powers internal logic and retains NVM configuration but cannot regulate output - it remains in standby until VDDS rises above UVLO threshold. This allows pre-configuration, fault logging, and diagnostic reads via SMBus even when primary power is off. The ZL2105ALNFT datasheet Section 4.1 confirms this dual-supply capability.
What is the function of the FC pin on ZL2105ALNFT, and how is it used?
The FC (Frequency Compensation) pin on ZL2105ALNFT selects one of three internal compensation networks to match the external output filter (inductor + capacitor). It is configured via resistor-to-SGND (25 discrete values) or PMBus command. Correct FC setting ensures stable loop response across load and temperature - improper selection may cause oscillation or slow transient recovery. The ZL2105ALNFT datasheet Table 5 and Section 5.11 detail FC resistor values for common L-C combinations.
Is ZL2105ALNFT pin-compatible with other Zilker Labs Digital-DC converters like ZL2005 or ZL2008?
No, ZL2105ALNFT is not pin-compatible with ZL2005 or ZL2008. While sharing the Digital-DC architecture and PMBus command set, ZL2105ALNFT uses a unique 36-pin QFN layout with distinct pin assignments (e.g., dual SW pins, dedicated XTEMP, V0/V1 voltage select). Migration requires PCB redesign. However, configuration files and GUI settings from ZL2105ALNFT can be reused in Renesas PowerNavigator™ for newer Digital-DC devices with appropriate pin mapping adjustments.
ZL2105ALNFT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 36-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Programmable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 14V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5V
- Current - Output:
- 3A
- Frequency - Switching:
- 200kHz ~ 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-QFN (6x6)
ZL2105ALNFT FAQ
1.How can I place an order for ZL2105ALNFT through Aetrix?
Please submit a Request for Quotation (RFQ) for ZL2105ALNFT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ZL2105ALNFT reliable?
The price and inventory of ZL2105ALNFT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZL2105ALNFT is usually 5 days.
3.What payment methods are accepted for ZL2105ALNFT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZL2105ALNFT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZL2105ALNFT?
ZL2105ALNFT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZL2105ALNFT order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ZL2105ALNFT?
For technical support, including ZL2105ALNFT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZL2105ALNFT requirements.
6.How does Aetrix verify that ZL2105ALNFT is sourced from the original manufacturer or authorized distributors?
All ZL2105ALNFT products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ZL2105ALNFT meets industry standards.
7.What is the process for return or replacement of ZL2105ALNFT?
All ZL2105ALNFT units undergo pre-shipment inspection (PSI). If there is an issue with ZL2105ALNFT, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ZL2105ALNFT part is unused and in its original packaging.
Return procedure for ZL2105ALNFT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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