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Renesas ZL2101ALAF
- Part No.:
- ZL2101ALAF
- Manufacturer:
- Renesas
- Package:
- 36-VFQFN Exposed Pad
- Datasheet:
-
ZL2101ALAF.pdf
- Description:
- IC REG BUCK ADJ 6A 36QFN
- Quantity:
- Payment:
- Shipping:
Inventory:397
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Product details
Overview
ZL2101ALAF from Intersil (now Renesas) is a 6A digital synchronous step-down DC/DC converter with integrated power MOSFETs, auto compensation, and PMBus™-compliant I²C/SMBus interface. It delivers 0.54V–5.5V output from 4.5V–14V input, achieves ±1% VOUT accuracy, supports phase spreading, and operates in -40°C to +85°C ambient for telecom and industrial distributed power systems.
For engineers reviewing the ZL2101ALAF datasheet, ZL2101ALAF pinout, ZL2101ALAF application, or ZL2101ALAF equivalent, key selection criteria include its 36-pin 6mm×6mm QFN package, integrated 6A power stage, digital soft-start/sequencing/margining, internal NVM, and interoperability via Digital-DC Bus with other Zilker Labs devices.
Technical Context
The ZL2101ALAF implements a digitally controlled PWM architecture with an on-chip 200kHz–1MHz adjustable switching frequency, internal PLL-based clock synchronization (SYNC pin), and dual-loop voltage-mode control with auto-compensation enabled via FC pin configuration. Its power stage integrates high-side and low-side N-channel MOSFETs with typical rDS(ON) of 60mΩ and 43mΩ respectively.
Power management functions-including sequencing, tracking, margining, and fault response-are configurable either by pin-strapping (e.g., SS, VTRK, MGN) or through PMBus commands stored in on-chip non-volatile memory. The device features three internal LDOs (7V/5V/2.5V) powering analog/digital/switching circuitry, with dedicated PGND, SGND, and DGND planes for noise isolation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 6A continuous RMS - supports high-density point-of-load designs without external current-sense resistors or discrete FETs. |
| Input Voltage Range | 4.5V to 14V - compatible with 5V and 12V intermediate bus architectures in telecom and storage equipment. |
| Output Voltage Range | 0.54V to 5.5V - covers core logic, I/O, and auxiliary rails including DDR termination and FPGA VCCINT/VCCAUX. |
| VOUT Accuracy | ±1% over line/load/temperature - enables tight regulation for sensitive processors and ASICs without external trimming. |
| Interface Protocol | PMBus v1.2 compliant I²C/SMBus - allows real-time telemetry (VOUT, IOUT, temperature), configuration, and fault logging in host-managed systems. |
| Switching Frequency | 200kHz to 1MHz - selectable via SYNC pin or PMBus; higher frequencies reduce inductor size but increase switching losses. |
| Package | 36-lead 6mm × 6mm QFN with exposed thermal pad - optimized for thermal performance in high-power density layouts. |
Pinout & Package
The ZL2101ALAF is housed in a 36-lead, 6mm × 6mm, 0.5mm pitch QFN package (PKG DWG # L36.6x6C) with an exposed thermal pad connected to SGND. Thermal resistance is θJA = 28°C/W and θJC = 1.7°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 PG | Power-good status output | Open-drain or push-pull signal asserting 100ms after VOUT stabilizes within ±1% - used for system power sequencing and fault indication. |
| 3 SYNC | Frequency synchronization I/O | Configurable as clock output (200kHz–1MHz), external clock input, or auto-detect mode - enables multi-phase interleaving and EMI reduction. |
| 4 VSET | Output voltage set-point input | Analog pin setting nominal VOUT via resistor divider; also accepts PMBus-programmed values for dynamic adjustment. |
| 6 SCL / 7 SDA | I²C/SMBus bidirectional interface | Supports PMBus command set for configuration, telemetry, and fault reporting; requires external pull-ups per bus loading. |
| 11 SS | Soft-start timing control | Resistor or capacitor sets delay (2–20ms) and ramp time (2–20ms); also configurable via PMBus for precise startup control. |
| 13 VSEN | Output voltage feedback sense | High-impedance input (110–200µA bias) for remote sensing - minimizes IR drop errors in PCB traces. |
| 20–25 SW | Switching node (5 pins) | Parallel connection reduces conduction loss and thermal stress; connects directly to inductor and bootstrap capacitor. |
| 26 BST | Bootstrap supply for high-side driver | Charged via internal Schottky diode; referenced to SW - eliminates need for external bootstrap diode in layout. |
| 27–29 VDDP | High-side gate driver bias supply | Powered from VIN; supplies level-shift drivers for high-side FET - decoupled to PGND with low-ESR ceramic capacitors. |
| 30 VDDS | Digital core supply | Internal 5V LDO output (from VR/VRA); powers digital logic and SMBus interface - decoupled to SGND. |
| 31 VR | 7V internal LDO output | Supplies high-side gate driver; rated for 10mA load - requires 4.7µF decoupling to PGND. |
| 32 VRA | 5V internal LDO output | Supplies analog circuitry (error amp, ADC, reference); rated for 20mA - requires 4.7µF decoupling to SGND. |
| 33 V2P5 | 2.5V internal LDO output | Supplies digital logic and NVM; rated for 20mA - requires 10µF decoupling to DGND. |
| 34 DDC | Digital-DC Bus interface | Open-drain bus for inter-device coordination (phase spreading, fault spreading, sequencing) - requires external 10kΩ pull-up. |
| 35 MGN | Voltage margining enable | Active-high input enabling ±5% programmable VOUT margining for production testing and system validation. |
| 36 EN | Enable control input | Active-high logic input; asserts internal UVLO and initiates soft-start sequence - supports precise timing when used instead of PMBus enable. |
| ePad | Thermal pad / SGND | Exposed copper pad soldered to SGND plane - primary thermal path; must be thermally connected for rated 6A operation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous power stage | Eliminates 4 external MOSFETs and gate drivers; reduces BOM count and layout area while maintaining 6A capability. |
| Auto compensation (CompZL™) | Automatically configures loop compensation based on output filter components - removes manual tuning and accelerates design cycle. |
| Snapshot™ parametric capture | Captures real-time waveforms (VOUT, IOUT, temperature) during transient events and stores in NVM for post-fault analysis. |
| Digital-DC Bus (DDC) | Enables synchronized start-up, phase spreading, and coordinated fault response across multiple Zilker Labs converters without host intervention. |
| Non-volatile memory (NVM) | Stores PMBus configuration, fault logs, and calibration data - retains settings across power cycles and simplifies field updates. |
| Multi-mode pins (SS, CFG, FC, etc.) | Single physical pin supports multiple configurations (e.g., SS pin sets delay/ramp via RC or enables PMBus override) - increases flexibility without extra pins. |
Applications
| Telecom Line Cards | Industrial PLC Power Rails |
|---|---|
|
Use Scenario: Providing regulated 3.3V/6A power to FPGA, SERDES, and packet processing ASICs on carrier-grade line cards. IC Role / Device Role / Timing Role: Primary point-of-load regulator with PMBus telemetry and sequencing coordination via DDC bus. Use Value: ±1% VOUT accuracy ensures stable operation under dynamic load transients; phase spreading reduces input capacitance requirements by up to 40%. |
Use Scenario: Delivering 1.2V/6A to ARM Cortex-A series processors and 5V/3A to I/O peripherals in ruggedized programmable logic controllers. IC Role / Device Role / Timing Role: Digitally managed buck converter supporting voltage margining, thermal shutdown, and output tracking for multi-rail systems. Use Value: Integrated soft-start delay/ramp prevents inrush current damage; VTRK pin enables precise 100% tracking of auxiliary 5V rail. |
| Network Switch ASIC Core Supply | Test Equipment Power Subsystem |
|
Use Scenario: Generating 0.85V/6A for high-performance switch ASICs requiring tight regulation and fast transient response. IC Role / Device Role / Timing Role: High-accuracy digital buck converter with Snapshot™ capture for validating power integrity during stress testing. Use Value: 100µs soft-start ramp accuracy and 16µs fault response time ensure reliable startup and protection against short-circuit events. |
Use Scenario: Supplying programmable 1.8V–3.3V outputs with margining and sequencing for automated test equipment (ATE) channel boards. IC Role / Device Role / Timing Role: Configurable power module supporting PMBus-based remote calibration and dynamic voltage adjustment. Use Value: Internal NVM stores calibrated settings per channel; MGN pin enables ±5% margining for production test coverage without hardware changes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZL2102 | Successor device with enhanced thermal performance (θJA = 22°C/W), extended VIN range (3.3V–14V), and improved current limit accuracy (±5% vs ±10%). | Supports lower-input 3.3V intermediate buses and higher ambient temperatures; retains full PMBus and DDC compatibility. | Select ZL2102 for new designs requiring wider input range, better thermal headroom, or tighter current limit tolerance. |
| ISL8206M | 6A analog buck module with integrated inductor; no digital interface, no NVM, no PMBus, no DDC bus - fixed-frequency (300kHz–1MHz) analog control. | Suitable for cost-sensitive, non-host-managed applications where telemetry, sequencing, and firmware updates are unnecessary. | Choose ISL8206M when digital control, fault logging, or multi-device coordination are not required and board space is constrained. |
Compared with ZL2101ALAF, ZL2102 offers superior thermal metrics and broader input capability while maintaining pin and firmware compatibility, whereas ISL8206M trades digital intelligence for simplicity and integration - making it appropriate only for static, non-networked power rails.
Availability
ZL2101ALAF is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and test equipment applications requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.
Supply support for ZL2101ALAF 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
Intersil Corporation (acquired by Renesas Electronics in 2017) is a semiconductor company specializing in precision analog, power management, and interface ICs for high-reliability applications.
The ZL2101ALAF belongs to Zilker Labs' Digital-DC product line, designed specifically for intelligent, host-managed power systems in telecom, networking, and industrial equipment requiring configurability, telemetry, and interoperability.
FAQ
What is the recommended input voltage range for reliable operation of the ZL2101ALAF?
The ZL2101ALAF operates reliably across an input voltage range of 4.5V to 14V. This range supports standard 5V and 12V intermediate bus architectures. Operation below 4.5V may trigger undervoltage lockout, while exceeding 14V risks violating absolute maximum ratings. For optimal efficiency and thermal performance, use VIN ≥ 6V when delivering >4A loads. The ZL2101ALAF datasheet specifies that VDDP and VDDS supplies must be maintained within their respective operating ranges depending on bias configuration.
Does the ZL2101ALAF require external MOSFETs or gate drivers?
No, the ZL2101ALAF integrates both high-side and low-side N-channel synchronous MOSFETs with typical rDS(ON) values of 60mΩ and 43mΩ, eliminating the need for external power switches or drivers. It also includes an internal Schottky bootstrap diode, removing the requirement for an external bootstrap diode. These integrations reduce total solution size, component count, and layout complexity while maintaining 6A continuous output capability.
How does the auto compensation feature work in the ZL2101ALAF?
The ZL2101ALAF's auto compensation (CompZL™) uses on-chip measurement of output filter component values - primarily output capacitance and ESR - to automatically configure the digital control loop's compensation network. This occurs during startup or via PMBus command. It eliminates manual loop tuning, reduces design iteration time, and ensures stability across varying output capacitor types (e.g., ceramic vs. polymer) and aging effects without requiring external compensation components.
Can the ZL2101ALAF be used in multi-phase or interleaved configurations?
Yes, the ZL2101ALAF supports multi-phase operation via its SYNC pin and Digital-DC Bus (DDC). The SYNC pin can be configured as a clock output (200kHz–1MHz), input, or auto-detect mode to synchronize switching across multiple ZL2101ALAF units. Additionally, the open-drain DDC bus enables automatic phase spreading and coordinated fault response between devices without host controller involvement - reducing input ripple and system-level capacitance requirements.
Is the ZL2101ALAF still recommended for new designs?
No - the ZL2101ALAF is marked "NOT RECOMMENDED FOR NEW DESIGNS" in its official datasheet (FN7730 Rev 0.00), with ZL2102 listed as the recommended replacement. While ZL2101ALAF remains available for legacy support and existing production, new designs should use ZL2102 for improved thermal performance, extended input range (3.3V–14V), tighter current limit accuracy, and continued long-term availability. Aetrix Electronics provides migration guidance and cross-reference support for ZL2101ALAF to ZL2102 transitions.
ZL2101ALAF 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:
- Adjustable (Programmable)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 14V
- Voltage - Output (Min/Fixed):
- 0.6V (1.2V, 1.5V, 3.3V)
- Voltage - Output (Max):
- 5V
- Current - Output:
- 6A
- Frequency - Switching:
- 200kHz ~ 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-QFN (6x6)
ZL2101ALAF FAQ
1.How can I place an order for ZL2101ALAF through Aetrix?
Please submit a Request for Quotation (RFQ) for ZL2101ALAF 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 ZL2101ALAF reliable?
The price and inventory of ZL2101ALAF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZL2101ALAF is usually 5 days.
3.What payment methods are accepted for ZL2101ALAF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZL2101ALAF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZL2101ALAF?
ZL2101ALAF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZL2101ALAF 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 ZL2101ALAF?
For technical support, including ZL2101ALAF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZL2101ALAF requirements.
6.How does Aetrix verify that ZL2101ALAF is sourced from the original manufacturer or authorized distributors?
All ZL2101ALAF 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 ZL2101ALAF meets industry standards.
7.What is the process for return or replacement of ZL2101ALAF?
All ZL2101ALAF units undergo pre-shipment inspection (PSI). If there is an issue with ZL2101ALAF, 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 ZL2101ALAF part is unused and in its original packaging.
Return procedure for ZL2101ALAF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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