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Renesas ZL2101ALAFT
- Part No.:
- ZL2101ALAFT
- Manufacturer:
- Renesas
- Package:
- 36-VFQFN Exposed Pad
- Datasheet:
-
ZL2101ALAFT.pdf
- Description:
- IC REG BUCK ADJ 6A 36QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,272
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Product details
Overview
ZL2101ALAFT 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% output voltage accuracy, and supports phase spreading for reduced input capacitance in telecom and industrial 5V/12V distributed power systems.
For engineers reviewing the ZL2101ALAFT datasheet, ZL2101ALAFT pinout, ZL2101ALAFT application, or ZL2101ALAFT equivalent, this page provides verified technical context, validated pin functions, confirmed package mapping (36-lead 6mm×6mm QFN), real-world application cards, and two documented alternative parts with precise functional and application-level differences.
Technical Context
The ZL2101ALAFT implements a digitally controlled PWM architecture with internal high-side (60 mΩ typ.) and low-side (43 mΩ typ.) N-channel MOSFETs, a 200–1000 kHz programmable switching frequency, and dual-loop control using VSEN feedback and internal current sensing. Its Digital-DC engine enables Snapshot™ parametric capture and auto compensation via FC pin configuration or PMBus commands.
Power management logic integrates sequencing, tracking (via VTRK), margining (MGN), soft-start delay/ramp (SS pin or SMBus), and fault protection including UVLO (configurable 2.85–16 V), OVP (115% VOUT), and thermal shutdown (125°C default). All settings persist in on-chip non-volatile memory (NVM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 6 A continuous - supports full-load operation without external current sharing in compact 5V/12V point-of-load designs. |
| Input Voltage Range | 4.5 V to 14 V - compatible with standard industrial and telecom input rails including 5V, 12V, and wide-range 12V systems. |
| Output Voltage Range | 0.54 V to 5.5 V - covers core voltages for FPGAs, ASICs, and microprocessors with ±1% accuracy over line/load/temp. |
| Switching Frequency | 200 kHz to 1000 kHz - adjustable via SYNC pin or PMBus; enables optimization of size vs. efficiency (e.g., 200 kHz @ VIN=12V/VOUT=3.3V yields >90% peak efficiency). |
| Interface Protocol | PMBus™ v1.1 compliant I²C/SMBus - enables host-controlled configuration, telemetry (VOUT, IOUT, temperature), and fault logging without custom firmware. |
| Package | 36-lead 6 mm × 6 mm QFN with exposed thermal pad - requires SGND-connected ePad for thermal performance (θJC = 1.7°C/W) and EMI reduction. |
| Protection Features | UVLO, OVP, OCP (9 A peak limit), OTP (125°C), and pre-bias start-up - ensures robust operation in unregulated or hot-swap environments. |
Pinout & Package
Package: 36-lead QFN, 6 mm × 6 mm, 0.5 mm pitch, exposed thermal pad (ePad) connected to SGND per datasheet Figure 4.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 PG | Power-good status output | Open-drain or push-pull signal asserting 100 ms after VOUT stabilizes within ±1%; used for system power sequencing enable. |
| 3 SYNC | Frequency synchronization I/O | Configurable as clock output (200–1000 kHz), external clock input, or auto-detect mode - enables multi-phase interleaving to reduce input ripple. |
| 4 VSET | Output voltage set-point input | Analog resistor-divider input setting nominal VOUT; also accepts SMBus override for dynamic margining or adaptive voltage scaling. |
| 6 SCL / 7 SDA | I²C/SMBus bidirectional bus | PMBus-compliant interface for configuration, telemetry, and fault reporting; supports up to 100 kbps standard-mode operation. |
| 11 SS | Soft-start timing control | Resistor-to-ground sets delay (2–20 ms) and ramp time; SMBus override enables precise 2 ms delay with ±0.25 ms accuracy. |
| 13 VSEN | Output voltage sense input | High-impedance feedback node (110–200 µA bias) for remote sensing; enables ±1% regulation accuracy under load-induced PCB drop. |
| 15–19, 20–25 PGND / SW | Power ground and switching node | Multi-pin PGND (pins 15–19) and SW (pins 20–25) minimize IR drop and EMI; SW pins connect directly to external inductor and bootstrap capacitor. |
| ePad | Thermal and analog ground | Exposed copper pad tied to SGND - mandatory for thermal dissipation (3.5 W max at +25°C) and analog reference stability. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous MOSFETs | Eliminates 4 external power switches and gate drivers; reduces BOM count and layout area while enabling 6 A continuous output in 36-QFN. |
| Auto compensation (CompZL™) | Removes need for external compensation network - FC pin strapping or PMBus command configures loop response for any output capacitor type/ESR. |
| Snapshot™ parametric capture | Captures real-time waveforms (VOUT, IOUT, temperature) during faults or transients - enables root-cause analysis without oscilloscope probing. |
| Digital-DC bus interoperability | DDC bus (pin 34) allows synchronized startup, phase spreading, and fault spreading across multiple Zilker Labs devices without host intervention. |
| Non-volatile memory (NVM) | Stores all configuration settings (VOUT, fSW, sequencing, protection thresholds) - retains settings across power cycles and eliminates boot-time SMBus initialization. |
Applications
| Telecom Point-of-Load Regulation | Industrial FPGA Core Supply |
|---|---|
|
Use Scenario: Regulating 1.2 V @ 5 A for Xilinx Kintex-7 FPGA in a 1U telecom blade with strict thermal limits and hot-swap requirements. IC Role / Device Role / Timing Role: Primary synchronous buck controller with PMBus telemetry, sequencing with auxiliary rails, and pre-bias start-up support. Use Value: ±1% VOUT accuracy maintains FPGA timing margins; Snapshot™ captures rail collapse during brown-out events for diagnostics. |
Use Scenario: Powering dual-core ARM Cortex-A9 processor (1.35 V @ 4.2 A) in an industrial PLC with isolated CAN and Ethernet interfaces. IC Role / Device Role / Timing Role: Digitally managed POL converter with voltage tracking (VTRK) for I/O and core domains, and thermal foldback at 125°C. Use Value: Phase spreading across two ZL2101ALAFT units reduces 12 V input ripple by 40%, minimizing bulk capacitor count and board area. |
| Test Equipment Power Module | Storage Controller Voltage Scaling |
|
Use Scenario: Programmable 3.3 V/6 A supply in automated test equipment requiring fast voltage settling (<10 ms), margining, and calibration traceability. IC Role / Device Role / Timing Role: Precision DC/DC with SMBus-controlled margining (±5%), soft-start ramp accuracy (±100 µs), and NVM-stored calibration offsets. Use Value: Margining via MGN pin enables hardware-level pass/fail testing without host software; ±0.025% FS VOUT resolution supports metrology-grade validation. |
Use Scenario: Adaptive voltage scaling for NVMe SSD controller in enterprise storage rack, dynamically adjusting VDD from 1.1 V to 1.35 V based on workload. IC Role / Device Role / Timing Role: Digitally reconfigurable buck converter with real-time VOUT update via PMBus WRITE_VOUT_COMMAND (10 ms typical transition). Use Value: On-chip NVM stores multiple VOUT profiles; Snapshot™ logs transient response during voltage transitions to verify stability under load steps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZL2102 | Successor device with enhanced thermal performance (θJA = 24°C/W), extended fSW range (200–1200 kHz), and improved current limit accuracy (±5% vs. ±10%). | Recommended for new designs requiring higher efficiency at 1 MHz or tighter current-limit tolerance in high-density layouts. | Select ZL2102 when upgrading from ZL2101ALAFT for improved thermal headroom and broader frequency tuning - not pin-compatible; requires layout revision. |
| TPS546D24A | TI part with 6 A rating, PMBus 1.3, 400–2000 kHz fSW, but no integrated NVM or Snapshot™; uses external compensation. | Suitable for cost-sensitive industrial designs where host-based configuration suffices and advanced diagnostics are not required. | Choose TPS546D24A only if SMBus telemetry suffices and NVM persistence or transient waveform capture is unnecessary - pinout and footprint differ. |
Compared with ZL2102 and TPS546D24A, the ZL2101ALAFT uniquely combines on-chip NVM, Snapshot™, and CompZL™ auto compensation in a single 36-QFN package - making it optimal for legacy systems requiring field-upgradable configurations and embedded diagnostics without host dependency.
Availability
ZL2101ALAFT is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ZL2101ALAFT 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 (acquired by Renesas Electronics in 2017) is a semiconductor company specializing in precision analog, power management, and interface ICs for industrial, aerospace, and communications markets.
The ZL2101 series belongs to Zilker Labs' Digital-DC product line, designed specifically for digitally managed point-of-load power conversion in high-reliability systems requiring telemetry, configurability, and autonomous fault response.
FAQ
What is the recommended input voltage range for reliable operation of the ZL2101ALAFT?
The ZL2101ALAFT operates reliably across an input voltage range of 4.5 V to 14 V. This range supports common intermediate bus standards including 5 V, 12 V, and wide-input 12 V systems. Operation below 4.5 V may trigger undervoltage lockout, while exceeding 14 V risks violating absolute maximum ratings for VDDP/VDDS pins. The device's internal LDOs (VR, VRA, V2P5) derive bias from VIN, ensuring stable internal regulation across this span.
Does the ZL2101ALAFT support remote voltage sensing, and how is it implemented?
Yes, the ZL2101ALAFT supports true remote voltage sensing via the VSEN pin (pin 13). This high-impedance input (110–200 µA bias current) connects directly to the load point, compensating for IR drop across PCB traces. When enabled, the internal error amplifier regulates based on VSEN rather than the local FB node, achieving ±1% output voltage accuracy under varying load conditions - critical for FPGA and ASIC core supplies.
Can the ZL2101ALAFT be configured without a microcontroller or host processor?
Yes, the ZL2101ALAFT supports full stand-alone operation using pin-strapping. Functions including output voltage (VSET), soft-start timing (SS), auto compensation (FC), and sequencing (CFG, VTRK) can be set via resistors or logic levels. Its on-chip NVM retains these settings across power cycles, eliminating dependency on external firmware. Host communication via SMBus remains optional for dynamic reconfiguration or telemetry.
What thermal management guidance applies to the ZL2101ALAFT in high-power applications?
The ZL2101ALAFT requires proper thermal design due to its 3.5 W maximum power dissipation at +25°C ambient. Key practices include soldering the exposed thermal pad (ePad) to a minimum 200 mm² SGND copper area with ≥4 thermal vias, using 2 oz copper layers, and avoiding component placement above the ePad. Thermal resistance θJC is 1.7°C/W; junction temperature must stay ≤+125°C under worst-case load and ambient conditions per Figure 8 SOA curves.
Is the ZL2101ALAFT still recommended for new designs, and what is its replacement path?
No - the ZL2101ALAFT is marked "NOT RECOMMENDED FOR NEW DESIGNS" in the official datasheet (FN7730 Rev 0.00, Page 2), with ZL2102 designated as the recommended replacement. While ZL2101ALAFT remains available for legacy support and repair, new designs should use ZL2102 for improved thermal performance, extended frequency range, and enhanced current-limit accuracy. Migration requires schematic and layout updates due to non-pin-compatibility.
ZL2101ALAFT 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:
- 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)
ZL2101ALAFT FAQ
1.How can I place an order for ZL2101ALAFT through Aetrix?
Please submit a Request for Quotation (RFQ) for ZL2101ALAFT 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 ZL2101ALAFT reliable?
The price and inventory of ZL2101ALAFT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZL2101ALAFT is usually 5 days.
3.What payment methods are accepted for ZL2101ALAFT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZL2101ALAFT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZL2101ALAFT?
ZL2101ALAFT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZL2101ALAFT 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 ZL2101ALAFT?
For technical support, including ZL2101ALAFT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZL2101ALAFT requirements.
6.How does Aetrix verify that ZL2101ALAFT is sourced from the original manufacturer or authorized distributors?
All ZL2101ALAFT 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 ZL2101ALAFT meets industry standards.
7.What is the process for return or replacement of ZL2101ALAFT?
All ZL2101ALAFT units undergo pre-shipment inspection (PSI). If there is an issue with ZL2101ALAFT, 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 ZL2101ALAFT part is unused and in its original packaging.
Return procedure for ZL2101ALAFT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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