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Renesas ZL2105ALNF
- Part No.:
- ZL2105ALNF
- Manufacturer:
- Renesas
- Package:
- 36-VFQFN Exposed Pad
- Datasheet:
-
ZL2105ALNF.pdf
- Description:
- IC REG BUCK PROG 3A 36QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,152
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Product details
Overview
ZL2105ALNF from Intersil (now Renesas) is a digitally controlled, synchronous step-down DC-DC converter IC integrating 4.5 A MOSFETs, PMBus™/SMBus™ interface, and comprehensive power management functions in a 6 × 6 mm QFN package. It delivers up to 3 A continuous output current with ±1% VOUT accuracy, 200 kHz–2 MHz programmable switching frequency, and supports voltage tracking, sequencing, margining, and thermal monitoring for point-of-load regulation in telecom and industrial systems.
For engineers reviewing the ZL2105ALNF datasheet, ZL2105ALNF pinout, ZL2105ALNF application, or ZL2105ALNF equivalent, key selection considerations include its integrated dual N-channel MOSFETs (RDS(ON) ≤ 180 mΩ HS / 140 mΩ LS), digital soft-start/ramp control via SS/DLY pins or SMBus, 0.54–5.5 V output range with 10 mV resistor-set resolution, and support for phase spreading in multi-rail systems.
Technical Context
The ZL2105ALNF implements a voltage-mode, synchronous buck architecture with a mixed-signal digital PWM loop-combining fast analog-to-digital conversion of VSEN feedback with digitally adjustable compensation and non-linear response (NLR) for transient suppression. Its internal PLL synchronizes switching to an external clock or sets precise internal frequencies between 200 kHz and 2 MHz.
Power management logic operates independently of the PWM core: multi-mode pins (e.g., V0/V1, SS, DLY, ILIM, UVLO) enable configuration without firmware, while full runtime reconfiguration and real-time telemetry (VOUT, IOUT, temperature, faults) are accessible via standard PMBus commands over SCL/SDA. Internal NVM stores user-defined settings across power cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3 A continuous - supports sustained load delivery without external current-sharing circuitry. |
| Input Voltage Range | 4.5 V to 14 V - enables direct operation from 5 V, 12 V, or 48 V intermediate bus rails with no auxiliary bias supply. |
| Output Voltage Range | 0.54 V to 5.5 V - covers DDR memory, FPGA core, ASIC I/O, and microcontroller rails with margining support. |
| VOUT Accuracy | ±1% - ensures stable regulation under line, load, and temperature variation without calibration. |
| Switching Frequency | 200 kHz to 2 MHz - allows optimization of size (high fSW) vs. efficiency (low fSW) and EMI filtering requirements. |
| MOSFET RDS(ON) | HS: ≤180 mΩ, LS: ≤140 mΩ - minimizes conduction loss and thermal rise at 3 A, enabling compact thermal design. |
| Communication Interface | PMBus v1.1 compliant over SMBus - provides standardized read/write access to 100+ parameters including telemetry, fault logs, and configuration. |
| Thermal Protection | Junction shutdown at 125°C with 15°C hysteresis - prevents damage during overload or airflow failure. |
Pinout & Package
Package: 36-pin QFN, 6 mm × 6 mm, 0.5 mm pitch, exposed thermal pad (SGND). RoHS-compliant, lead-free, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DGND (1) | Digital ground reference | Return path for logic-level signals; must be connected to low-impedance ground plane separate from PGND. |
| SYNC (2) | Frequency synchronization I/O | Accepts external clock or outputs synchronized signal; factory default push-pull, configurable as open-drain. |
| SA (3) | SMBus address select input | Configures 7-bit slave address (0x40–0x47); required for multi-device SMBus bus operation. |
| UVLO (4) | Undervoltage lockout threshold set | Resistor-divider from VIN sets disable threshold (3.79–13.2 V); hysteresis configurable via SMBus. |
| ILIM (5) | Current limit threshold set | Resistor-to-SGND selects peak current limit (0.2–4.5 A); accuracy ±100 mA. |
| SCL/SDA (6–7) | SMBus clock/data bidirectional | Standard 3.3 V tolerant I²C-compatible interface; supports PMBus READ/WRITE commands and ALERT polling. |
| V0/V1 (10–11) | Output voltage select inputs | Binary-coded pin-strapping (LOW/OPEN/HIGH) selects one of nine preset VOUT values (e.g., 1.2 V, 1.8 V, 3.3 V). |
| DLY (12) | Soft-start delay select | Resistor-to-SGND sets 7–200 ms delay before ramp initiation; SMBus override supports 7 ms–500 s range. |
| SS (13) | Digital soft-start/stop control | Resistor sets 10–100 ms ramp time; SMBus enables 0–200 ms with 100 µs accuracy. |
| VTRK (14) | Voltage tracking input | Analog input accepting external rail voltage; enables precise sequencing with ±100 mV tracking error. |
| VSEN (15) | Output voltage sense feedback | High-impedance (≤200 µA bias) input for remote sensing; enables accurate regulation despite PCB IR drop. |
| PGND (20–21) | Power ground return | Low-inductance return for high di/dt SW node currents; must be tied to thermal pad and isolated from DGND/SGND planes. |
| SW (22–23) | Switching node connection | Drives external inductor; connects internally to both HS and LS MOSFET sources/drains; requires tight layout to minimize ringing. |
| VDDP (24–25) | HS MOSFET gate driver supply | Supplies level-shift drivers; referenced to PGND; decoupling required near pin. |
| BST (26) | Bootstrap capacitor connection | Charges internal charge pump for HS gate drive; requires 10–22 nF ceramic capacitor between BST and SW. |
| VR (27) | Internal 5 V LDO output | Regulated 5 V supply for internal logic; 4.7 µF decoupling to PGND required; drives VRA via 91 Ω resistor. |
| VRA (28) | Analog 5 V bias supply | Stable 5 V reference for analog blocks; 4.7 µF decoupling to SGND required; powers VDDL if not externally supplied. |
| VDDL (29) | Digital logic supply input | Accepts 3.0–5.5 V external supply or ties to VRA; powers SMBus interface and digital logic. |
| VDDS (30) | Main IC supply input | Primary power input (4.5–14 V); powers internal regulators and control logic; must be filtered with ≥100 µF bulk capacitance. |
| V25 (31) | Internal 2.5 V LDO output | Reference for ADC and comparators; 10 µF decoupling to SGND required. |
| FC (32) | Frequency compensation select | Resistor sets dominant pole location for loop stability; matches compensation to selected inductor/capacitor values. |
| MGN (33) | Margining enable input | Active-high signal initiates ±5% or ±10% VOUT margining per PMBus command; used for production test and system validation. |
| CFG (34) | Phase delay & sequencing config | Multi-mode pin setting defines relative startup timing in multi-converter systems; supports interleaved or staggered operation. |
| EN (35) | Enable input | Active-high logic input; internal pull-down; asserts internal UVLO and resets all state machines on deassertion. |
| PG (36) | Power good open-drain output | Signals VOUT in regulation (90–115% of setpoint); 100 ms delay after stabilization; SMBus-configurable thresholds. |
| ePad (SGND) | Thermal & analog ground | Exposed paddle tied internally to SGND; mandatory solder connection to large copper area for thermal dissipation and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Digital soft-start/stop with programmable delay and ramp | Enables controlled power-up/down sequencing without external timers; eliminates inrush current and rail collapse in multi-rail systems. |
| Voltage tracking and sequencing via VTRK pin | Supports precise coordination of multiple supply rails (e.g., core before I/O) using analog tracking with ±100 mV error, eliminating need for discrete tracking ICs. |
| Non-volatile memory (NVM) storage | Persists SMBus-configured settings (VOUT, margins, protection thresholds) across power cycles-no host controller reprogramming required at boot. |
| Integrated thermal monitoring with XTEMP pin | Accepts external thermal diode (e.g., CPU/GPU diode) for system-level temperature awareness; triggers shutdown at user-defined junction temp. |
| Phase spreading support | Reduces input/output capacitor RMS current by interleaving multiple ZL2105ALNF units, lowering total capacitance and EMI filter size. |
| Programmable fault responses (UVLO, OVP, OCP, OTP) | Each protection feature offers configurable thresholds, hysteresis, and response modes (latch-off, auto-retry, or ignore), enabling robust system-level fault handling. |
Applications
| Telecom Line Cards | Distributed Power Architecture |
|---|---|
Use Scenario: Regulating 1.2 V/3 A for FPGA fabric and 3.3 V/2 A for SerDes interfaces on a 12 V backplane-fed line card. IC Role / Device Role / Timing Role: Primary point-of-load regulator with digital sequencing to ensure FPGA core powers before I/O banks. Use Value: Eliminates discrete sequencing ICs and external MOSFET drivers; achieves <1% VOUT drift across -40°C to +85°C ambient. |
Use Scenario: Providing tightly regulated 1.8 V, 2.5 V, and 5 V rails from a 12 V intermediate bus in a modular server PSU. IC Role / Device Role / Timing Role: Independent, SMBus-addressable POL converter enabling dynamic rail reconfiguration and telemetry aggregation. Use Value: Reduces board space by 40% vs. discrete controller + MOSFET solution; enables real-time current monitoring for predictive maintenance. |
| Industrial PLC Controllers | Storage System Power Modules |
Use Scenario: Delivering 5 V/3 A to ARM-based controller and 3.3 V/2 A to isolated I/O modules in a DIN-rail mounted PLC. IC Role / Device Role / Timing Role: Main DC-DC regulator with extended temperature operation (-40°C to +125°C TJ) and UVLO hysteresis tuning for unstable 24 V DC input. Use Value: Maintains regulation during brownouts; thermal shutdown prevents field failures in sealed enclosures with limited airflow. |
Use Scenario: Supplying 1.2 V/3 A to NVMe SSD controllers and 1.8 V/2 A to NAND flash in enterprise SSD modules. IC Role / Device Role / Timing Role: High-accuracy, low-noise POL converter with margining support for production burn-in testing. Use Value: ±1% VOUT accuracy ensures NAND timing compliance; SMBus telemetry reports die temperature to prevent write throttling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digitally controlled POL converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS546D24A (Texas Instruments) | Higher 10 A rating, 3.5 V–18 V input, supports AVS via VID pins; lacks integrated NVM and XTEMP interface. | Better suited for high-current ASIC/FPGA cores; requires external EEPROM for configuration persistence. | Select when >3 A output or AVS voltage scaling is required; avoid if thermal diode monitoring or NVM retention is critical. |
| ISL68224 (Renesas, formerly Intersil) | 4-phase controller (vs. single-phase ZL2105ALNF), supports up to 120 A with external DrMOS; includes digital loop compensation tuning. | Targets high-end server VRMs; requires external power stages and complex layout; no integrated MOSFETs. | Select for multi-phase, high-efficiency (>90%) 12 V input systems; not a drop-in replacement due to topology and external component requirements. |
Compared with TPS546D24A and ISL68224, the ZL2105ALNF provides the only fully integrated, NVM-equipped, thermally aware 3 A POL solution in a 6×6 mm footprint-ideal for space-constrained, single-rail applications requiring zero-host configuration and embedded diagnostics.
Availability
ZL2105ALNF is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and storage system power modules requiring stable component supply, long-term lifecycle assurance, and traceable sourcing from authorized channels.
Supply support for ZL2105ALNF 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 delivering microcontrollers, analog, power, and connectivity solutions for automotive, industrial, and datacenter markets.
The ZL2105ALNF belongs to Renesas' Digital-DC™ family-designed specifically for intelligent, self-contained point-of-load regulation where integration, configurability, and telemetry reduce system design complexity and time-to-market.
FAQ
What is the maximum supported input voltage for the ZL2105ALNF?
The ZL2105ALNF supports an absolute maximum input voltage of 17 V on VDDP, VDDS, and VDR pins. However, the recommended operating range is 4.5 V to 14 V for reliable continuous operation. Exceeding 14 V may trigger UVLO or degrade long-term reliability, and operation above 17 V risks permanent damage per Absolute Maximum Ratings in FN6851 Rev. 2.00.
Does the ZL2105ALNF require external MOSFETs?
No, the ZL2105ALNF integrates dual N-channel synchronous MOSFETs with RDS(ON) ≤ 180 mΩ (high-side) and ≤ 140 mΩ (low-side), enabling full 3 A operation without external switches. Only passive components-inductor, input/output capacitors, bootstrap capacitor, and optional compensation resistors-are needed for a complete power stage.
How is output voltage configured on the ZL2105ALNF?
Output voltage on the ZL2105ALNF can be set via three methods: (1) binary pin-strapping using V0/V1 pins (nine fixed values), (2) resistor divider on VSEN for analog adjustment (0.54–5.5 V), or (3) SMBus command for digital fine-tuning (±0.025% FS resolution). All settings persist in internal NVM unless overwritten.
Can the ZL2105ALNF operate with a 3.3 V input supply?
No-the ZL2105ALNF requires minimum 4.5 V on VDDS for proper internal bias generation. However, it supports 3.3 V operation on VDDL (logic supply) and can be powered from a 3.3 V standby rail for configuration and telemetry readout while main VDDS is off, enabling "always-on" monitoring capability.
What thermal management features does the ZL2105ALNF provide?
The ZL2105ALNF includes junction temperature monitoring with factory-default 125°C shutdown, user-configurable threshold (−40°C to 125°C), and 15°C hysteresis. It also accepts external thermal diode voltage via XTEMP pin for system-level temperature awareness, enabling coordinated thermal throttling across multiple devices.
ZL2105ALNF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 36-VFQFN Exposed Pad
- Packaging:
- Tray
- 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)
ZL2105ALNF FAQ
1.How can I place an order for ZL2105ALNF through Aetrix?
Please submit a Request for Quotation (RFQ) for ZL2105ALNF 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 ZL2105ALNF reliable?
The price and inventory of ZL2105ALNF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZL2105ALNF is usually 5 days.
3.What payment methods are accepted for ZL2105ALNF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZL2105ALNF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZL2105ALNF?
ZL2105ALNF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZL2105ALNF 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 ZL2105ALNF?
For technical support, including ZL2105ALNF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZL2105ALNF requirements.
6.How does Aetrix verify that ZL2105ALNF is sourced from the original manufacturer or authorized distributors?
All ZL2105ALNF 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 ZL2105ALNF meets industry standards.
7.What is the process for return or replacement of ZL2105ALNF?
All ZL2105ALNF units undergo pre-shipment inspection (PSI). If there is an issue with ZL2105ALNF, 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 ZL2105ALNF part is unused and in its original packaging.
Return procedure for ZL2105ALNF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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