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Renesas ZL2105ALNFT1
- Part No.:
- ZL2105ALNFT1
- Manufacturer:
- Renesas
- Package:
- 36-VFQFN Exposed Pad
- Datasheet:
-
ZL2105ALNFT1.pdf
- Description:
- IC REG BUCK PROG 3A 36QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,720
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Product details
Overview
ZL2105ALNFT1 from Intersil (now Renesas) is a 3 A integrated digital DC-DC synchronous buck converter with PMBus™/SMBus™ interface, internal 4.5 A MOSFETs, 0.54 V–5.5 V output range, ±1% voltage accuracy, and 200 kHz–2 MHz programmable switching frequency-designed for point-of-load regulation in telecom and industrial 12 V distributed power systems.
For engineers reviewing the ZL2105ALNFT1 datasheet, ZL2105ALNFT1 pinout, ZL2105ALNFT1 application, or ZL2105ALNFT1 equivalent, key selection criteria include its digital soft-start/ramp control, voltage tracking/sequencing capability, thermal shutdown with configurable threshold, non-volatile memory for configuration storage, and support for phase spreading to reduce input/output capacitance requirements.
Technical Context
The ZL2105ALNFT1 implements a voltage-mode synchronous buck architecture with dual N-channel MOSFETs (RDS(ON) = 125 mΩ high-side, 114–123 mΩ low-side), digitally controlled PWM loop combining analog error amplification and fast A/D conversion, and non-linear response (NLR) circuitry for enhanced transient load recovery. Its internal bias regulators (VR, VRA, V25) enable single-supply operation from 4.5 V–14 V without external LDOs.
Power management functions-including UVLO (3.79–13.2 V, ±2% accuracy), programmable PG delay (0–500 s), VSEN-based OVP/UVP (±100 mV tracking accuracy), current limit (0.2–4.5 A), and thermal shutdown (configurable −40°C to 125°C)-are fully accessible via pin-strapping or SMBus commands compliant with PMBus v1.1. The device supports multi-mode pins (e.g., V0/V1, DLY, SS, ILIM) with resistor- or logic-level configuration and stores settings in on-chip NVM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current | 3 A continuous - sufficient for FPGA core rails, ASIC I/O, or DSP power domains without external current sharing. |
| Input voltage range | 4.5 V to 14 V - compatible with 5 V, 12 V, and wide-range industrial supplies; no auxiliary bias required. |
| Output voltage range | 0.54 V to 5.5 V - covers DDR3/4 VDDQ (1.35 V), PCIe 3.3 V, CPU cores (0.8–1.2 V), and analog rails (3.3/5 V). |
| Voltage accuracy | ±1% over line/load/temp - ensures stable regulation under dynamic load and temperature shifts without calibration. |
| Switching frequency | 200 kHz to 2 MHz - enables optimization of inductor size (e.g., 2.2 µH at 1 MHz) and EMI filtering trade-offs. |
| Communication interface | PMBus v1.1 over SMBus - allows real-time telemetry (VOUT, IOUT, TEMP), fault logging, and dynamic margining via host controller. |
| Thermal protection | Configurable junction shutdown from −40°C to 125°C - prevents damage during overload or poor heatsinking; 15°C hysteresis avoids oscillation. |
| Package | 6 × 6 mm QFN-36 with exposed thermal pad - provides low θJA = 35°C/W for high-power density PoL placement. |
Pinout & Package
Package: 36-pin QFN (6 mm × 6 mm, 0.5 mm pitch) with exposed thermal pad connected to SGND. Requires soldering to low-impedance ground plane via multiple vias for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DGND (Pin 1) | Digital ground reference | Return path for logic signals; must be isolated from PGND until joined at single-point SGND to minimize noise coupling. |
| SYNC (Pin 2) | Frequency synchronization I/O | Accepts external clock (200 kHz–2 MHz) or outputs synchronized PWM; factory default push-pull, configurable as open-drain. |
| SA (Pin 3) | SMBus address select | Defines unique 7-bit slave address (0x40–0x47); tied HIGH/LOW/OPEN to set LSB bits; mandatory for multi-device bus operation. |
| VSEN (Pin 15) | Output voltage sense input | High-impedance feedback node (100 µA bias) for precision regulation; connects directly to output rail or RC filter for noise immunity. |
| PG (Pin 36) | Power good status output | Open-drain signal asserting HIGH ≥100 ms after VOUT stabilizes within ±5% band; used for processor reset sequencing. |
| ePad (SGND) | Thermal & analog ground | Internally connected to SGND; primary heat dissipation path and reference for analog blocks (VRA, V25, XTEMP). |
Key Features
| Feature | Design Value |
|---|---|
| Digital soft-start/ramp control | Configurable delay (7–200 ms) and ramp time (10–200 ms) via DLY/SS pins or SMBus - eliminates inrush current and prevents supply droop during startup. |
| Voltage tracking & sequencing | VTRK pin accepts external reference (±100 mV accuracy) to coordinate power-up/down of multiple rails - essential for FPGAs with strict VCCINT/VCCAUX timing. |
| Non-volatile configuration memory | On-chip NVM stores pin-strap and SMBus settings - retains custom UVLO, PG delay, margining, and thermal thresholds across power cycles without host intervention. |
| Integrated MOSFET drivers & bootstrap | Internal 4.5 A drivers with BST pin and CP1/CP2 charge pump - eliminates external high-side gate driver and bootstrap diode, reducing BOM count by ≥4 components. |
| Multi-mode pin configuration | 12 pins (e.g., V0/V1, ILIM, FC) support LOW/OPEN/HIGH/resistor-strap states - enables 25+ discrete settings per pin without firmware, simplifying production setup. |
| Real-time telemetry & fault logging | SMBus registers report VOUT, IOUT, die temperature, XTEMP, and fault history (UVLO, OVP, OC, OT) - enables predictive maintenance and system-level power health monitoring. |
Applications
| Telecom Line Cards | Distributed Storage Controllers |
|---|---|
|
Use Scenario: Regulating 1.2 V core voltage for multi-core baseband processors in 4G/LTE radio units with tight thermal constraints and hot-swap capability. IC Role / Device Role / Timing Role: Primary point-of-load converter delivering 3 A at ±1% accuracy; executes precise power-on sequencing with adjacent 3.3 V I/O rail via VTRK pin. Use Value: Eliminates need for external sequencer IC and reduces PCB area by 35% versus discrete controller + MOSFET solution while supporting PMBus-based remote diagnostics. |
Use Scenario: Powering SAS/SATA controller ASICs in enterprise RAID enclosures requiring independent 1.8 V and 3.3 V rails with coordinated startup and margin testing. IC Role / Device Role / Timing Role: Dual-rail PoL regulator using V0/V1 pins for fixed 1.8 V output and SMBus for dynamic 3.3 V margining (±5%) during validation. Use Value: Enables automated production test of voltage tolerance margins without hardware rework; NVM stores pass/fail thresholds for each rail. |
| Industrial PLC CPU Modules | Test & Measurement Equipment |
|
Use Scenario: Providing 0.95 V @ 2.5 A to ARM Cortex-A9 SoC in ruggedized programmable logic controllers operating from 12 V DC field supply. IC Role / Device Role / Timing Role: Main SoC supply with UVLO set to 10.8 V to prevent brownout during 12 V battery sag; thermal shutdown configured at 110°C for extended ambient operation. Use Value: Maintains deterministic reset behavior during voltage transients and extends operational life in unventilated cabinets via accurate thermal monitoring. |
Use Scenario: Generating calibrated 5.0 V analog reference and 3.3 V digital supply for high-resolution ADC/DAC subsystems in portable oscilloscopes. IC Role / Device Role / Timing Role: Precision voltage source with ±0.025% FS setpoint resolution via SMBus; uses XTEMP pin to compensate reference drift against board temperature. Use Value: Achieves <10 ppm/°C total output drift across −20°C to +70°C, meeting Class I metrology accuracy requirements without external calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS544B20 (Texas Instruments) | 4 A output, 4.5–18 V input, 0.6–5.5 V output, PMBus v1.2, 5 mm × 6 mm QFN-32; lacks integrated NVM and XTEMP interface. | Requires external EEPROM for configuration retention; no direct thermal diode support - limits board-level thermal mapping capability. | Preferred when higher current headroom or wider input range is needed, but adds complexity for configuration persistence. |
| ISL68201 (Renesas, formerly Intersil) | 3 A, 4.5–16 V input, 0.5–5.5 V output, PMBus v1.3, 5 mm × 5 mm QFN-32; includes digital loop compensation tuning and enhanced telemetry. | Supports real-time loop gain adjustment and 12-bit telemetry resolution vs. ZL2105ALNFT1's 10-bit - better for adaptive control in variable-load systems. | Chosen for next-gen designs needing closed-loop optimization; not drop-in due to different pinout and register map. |
Compared with TPS544B20 and ISL68201, the ZL2105ALNFT1 offers superior integration of non-volatile configuration storage and dedicated XTEMP thermal diode interface in a mature, production-proven platform-making it optimal for cost-sensitive, thermally constrained PoL applications where firmware-free setup and long-term configuration stability are critical.
Availability
ZL2105ALNFT1 is available at Aetrix Electronics and suitable for telecom line cards, industrial PLCs, distributed storage controllers, and test equipment requiring stable component supply, long-lifecycle support, and verified PMBus interoperability.
Supply support for ZL2105ALNFT1 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 (formerly Intersil) is a global semiconductor leader specializing in microcontrollers, analog power, and connectivity solutions for automotive, industrial, and datacenter markets.
The ZL2105ALNFT1 belongs to Renesas' Zilker Labs Digital-DC™ family, engineered specifically for intelligent, software-configurable point-of-load power delivery in space-constrained, high-reliability systems where digital telemetry and autonomous fault response are mandatory.
FAQ
What is the maximum supported switching frequency for ZL2105ALNFT1?
The ZL2105ALNFT1 supports a programmable switching frequency range from 200 kHz to 2 MHz. This range is set via the SYNC pin (external clock input), resistor strapping on the FC pin, or SMBus command. At 2 MHz, the device enables compact magnetics (e.g., 1 µH inductors) and reduced output capacitance, though efficiency peaks near 500 kHz–1 MHz depending on input/output voltage conditions. The ZL2105ALNFT1 maintains stable regulation across the full range without loop recompensation.
Does ZL2105ALNFT1 require external MOSFETs or gate drivers?
No, the ZL2105ALNFT1 integrates dual N-channel synchronous MOSFETs with RDS(ON) of 125 mΩ (high-side) and 114–123 mΩ (low-side), along with fully integrated gate drivers and a bootstrap charge pump (CP1/CP2 pins). It eliminates the need for external power switches, high-side drivers, or discrete bootstrap diodes - reducing total solution size and component count by up to seven devices compared to controller-only solutions.
How is output voltage programmed on ZL2105ALNFT1?
The ZL2105ALNFT1 supports three output voltage programming methods: (1) Pin-strapping using V0/V1 pins (8 discrete settings from 0.6 V to 5.0 V), (2) Resistor-divider feedback to VSEN (0.54 V–5.5 V range), or (3) Digital setting via SMBus with ±0.025% full-scale resolution. All methods are stored in on-chip NVM. The ZL2105ALNFT1 does not require external DACs or trim pots for precision adjustment.
Can ZL2105ALNFT1 perform voltage margining during system operation?
Yes, the ZL2105ALNFT1 supports real-time voltage margining via the MGN pin (hardware-controlled ±5% steps) or SMBus commands (fine-grained ±10% range in 10 mV increments). Margining is applied directly to the internal reference and reflected at VSEN, enabling in-system validation of power integrity margins without interrupting operation - a key requirement for high-availability telecom and server platforms.
What thermal management features does ZL2105ALNFT1 provide?
The ZL2105ALNFT1 includes factory-default thermal shutdown at 125°C (junction), configurable from −40°C to 125°C via SMBus, with 15°C hysteresis. It also monitors external temperature via the XTEMP pin using a standard thermal diode, reporting values over SMBus. The exposed thermal pad (SGND) provides low-impedance heat transfer, achieving θJA = 35°C/W on a 4-layer board - critical for sustained 3 A operation in confined enclosures.
ZL2105ALNFT1 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)
ZL2105ALNFT1 FAQ
1.How can I place an order for ZL2105ALNFT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for ZL2105ALNFT1 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 ZL2105ALNFT1 reliable?
The price and inventory of ZL2105ALNFT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZL2105ALNFT1 is usually 5 days.
3.What payment methods are accepted for ZL2105ALNFT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZL2105ALNFT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZL2105ALNFT1?
ZL2105ALNFT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZL2105ALNFT1 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 ZL2105ALNFT1?
For technical support, including ZL2105ALNFT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZL2105ALNFT1 requirements.
6.How does Aetrix verify that ZL2105ALNFT1 is sourced from the original manufacturer or authorized distributors?
All ZL2105ALNFT1 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 ZL2105ALNFT1 meets industry standards.
7.What is the process for return or replacement of ZL2105ALNFT1?
All ZL2105ALNFT1 units undergo pre-shipment inspection (PSI). If there is an issue with ZL2105ALNFT1, 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 ZL2105ALNFT1 part is unused and in its original packaging.
Return procedure for ZL2105ALNFT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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