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Renesas ZL2101ALAFTK
- Part No.:
- ZL2101ALAFTK
- Manufacturer:
- Renesas
- Package:
- 36-VFQFN Exposed Pad
- Datasheet:
-
ZL2101ALAFTK.pdf
- Description:
- IC REG BUCK ADJ 6A 36QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,442
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Product details
Overview
ZL2101ALAFTK from Intersil (now Renesas) is a 6A digital synchronous step-down DC/DC converter with integrated power MOSFETs, auto compensation, and PMBus™-compliant digital control. It delivers 0.54V–5.5V output from 4.5V–14V input, achieves ±1% VOUT accuracy, supports phase spreading, and operates in telecom, networking, and industrial 5V/12V distributed power systems.
For engineers reviewing the ZL2101ALAFTK datasheet, ZL2101ALAFTK pinout, ZL2101ALAFTK application, or ZL2101ALAFTK equivalent, key selection considerations include its 36-pin 6mm×6mm QFN package, integrated 7V/5V/2.5V bias regulators, programmable soft-start (2ms–500s), margining capability, and Digital-DC bus interoperability with other Zilker Labs devices.
Technical Context
The ZL2101ALAFTK implements a digitally controlled PWM architecture with internal high-side (60mΩ typ.) and low-side (43mΩ typ.) N-channel MOSFETs, bootstrap-driven high-side gate drive (BST referenced to SW), and dual-loop voltage-mode control with auto-compensation via FC pin configuration. Its digital core uses an on-chip serial port for PMBus command execution and stores configuration in internal non-volatile memory.
Power management functions-including sequencing, tracking (via VTRK), margining (MGN), and fault spreading-are configurable via pin-strapping or PMBus. The device supports three SYNC modes (output, input, auto-detect) and uses a dedicated DDC bus for multi-device coordination without host intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 6A continuous - enables single-chip replacement of discrete buck + controller solutions in mid-power applications. |
| Input Voltage Range | 4.5V to 14V - supports standard 5V and 12V intermediate bus architectures without external pre-regulation. |
| Output Voltage Range | 0.54V to 5.5V - covers core logic, I/O, and analog rail requirements including sub-1V processors and FPGAs. |
| VOUT Accuracy | ±1% over line/load/temp - ensures stable regulation for sensitive digital loads without external trimming. |
| Switching Frequency | 200kHz to 1MHz - adjustable for EMI optimization or efficiency trade-offs; factory default 200kHz. |
| Interface Protocol | PMBus v1.1 compliant - enables standardized telemetry (VOUT, IOUT, temperature), configuration, and fault logging. |
| Package | 36-pin 6mm×6mm QFN with exposed thermal pad - provides low θJC (1.7°C/W) for high-power density layouts. |
Pinout & Package
Package: 36-lead 6mm × 6mm QFN (PKG DWG L36.6x6C), exposed thermal pad connected to SGND.
| 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. |
| 3 SYNC | Frequency synchronization I/O | Configurable as clock output (200kHz–1MHz), external clock input, or auto-detect mode - enables multi-phase interleaving. |
| 4 VSET | Output voltage set-point input | Analog resistor-divider or PMBus-programmable reference - sets nominal VOUT with 10mV resolution via resistors. |
| 6 SCL / 7 SDA | I²C/SMBus bidirectional interface | PMBus-compliant serial bus for real-time telemetry, configuration, and fault reporting - supports up to 100kbit/s standard mode. |
| 9 FC | Auto-compensation configuration | Multi-mode pin selecting compensation network type (Type II/III) - eliminates manual loop tuning during design. |
| 11 SS | Soft-start timing control | Resistor- or PMBus-configurable delay (2ms–500s) and ramp time (2ms–200ms) - prevents inrush current and enables precise power-up timing. |
| 13 VSEN | Output voltage feedback sense | High-impedance input (110–200µA bias) for remote sensing - rejects PCB IR drop to maintain ±1% regulation at load. |
| 20–25 SW | Switching node (5 pins) | Parallel-connected high-current path for internal MOSFETs - reduces trace inductance and improves thermal sharing across multiple SW pads. |
| 26 BST | Bootstrap supply for high-side driver | Capacitor-referenced (to SW) 6.5V bias - enables full enhancement of high-side N-MOSFET without external charge pump. |
| 27–29 VDDP | High-side gate driver supply | 3-pin parallel connection for low-impedance 7V bias to internal drivers - minimizes switching losses and improves transient response. |
| 30 VDDS | Digital core supply | 5.5V–7.5V input powering PMBus engine, NVM, and digital logic - decoupled via internal LDO from VR/VRA rails. |
| 31 VR | 7V internal LDO output | Regulated 7V supply (4.7µF decoupling) for VDDP drivers - eliminates need for external bias supply in most designs. |
| 32 VRA | 5V internal LDO output | Regulated 5V supply (4.7µF decoupling) for analog circuitry - powers VSEN, VTRK, and internal ADC references. |
| 33 V2P5 | 2.5V internal LDO output | Regulated 2.5V supply (10µF decoupling) for digital logic - powers SMBus interface and state machine. |
| 34 DDC | Digital-DC bus interface | Open-drain bus for inter-device coordination (phase spreading, fault spreading, sequencing) - no host controller required. |
| 35 MGN | Output voltage margining control | Digital input enabling ±5% VOUT margining - used for production testing and system validation under worst-case conditions. |
| 36 EN | Enable input | Active-high logic input with 2.0V VIH threshold - initiates soft-start sequence and controls UVLO behavior. |
| ePad | Thermal pad / SGND | Exposed copper pad soldered to SGND plane - provides primary thermal path (θJC = 1.7°C/W) and analog ground reference. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous MOSFETs | Eliminates 4 external power FETs and associated gate drivers - reduces BOM count and layout area by >30%. |
| Auto compensation (CompZL™) | Hardware-accelerated loop tuning via FC pin - removes requirement for stability analysis and external compensation components. |
| Snapshot™ parametric capture | On-demand capture of real-time waveforms (VOUT, IOUT, temperature) into NVM - enables post-fault root-cause analysis without oscilloscope. |
| Digital-DC bus (DDC) | Peer-to-peer communication between Zilker Labs devices - enables synchronized phase spreading and coordinated fault response without host CPU involvement. |
| Internal non-volatile memory (NVM) | Stores PMBus configuration, fault logs, and calibration data - retains settings across power cycles and enables field firmware updates. |
| Triple internal LDOs (7V/5V/2.5V) | Provides all internal bias supplies from VIN - removes need for external bias regulators and simplifies power tree design. |
Applications
| Telecom Line Cards | Industrial PLC Power Rails |
|---|---|
|
Use Scenario: Providing isolated 3.3V/6A and 1.2V/6A rails on carrier-grade line cards with strict thermal and reliability requirements. IC Role / Device Role / Timing Role: Primary point-of-load regulator with PMBus telemetry for remote monitoring and predictive maintenance. Use Value: ±1% VOUT accuracy and Snapshot™ capture enable early detection of aging-related output drift before service interruption occurs. |
Use Scenario: Generating 5V/6A and 2.5V/6A rails for FPGA, microcontroller, and I/O modules in modular PLC backplanes. IC Role / Device Role / Timing Role: Digitally managed buck converter supporting voltage tracking and sequencing across multiple power domains. Use Value: Pin-strappable VTRK and SS pins allow deterministic power-up order without external timers or CPLDs. |
| Storage Controller Boards | Test Equipment Power Modules |
|
Use Scenario: Delivering tightly regulated 1.8V/6A and 3.3V/6A to NVMe SSD controllers and DRAM buffers in enterprise storage enclosures. IC Role / Device Role / Timing Role: High-efficiency synchronous buck with margining support for production burn-in and lifetime stress testing. Use Value: MGN pin enables automated ±5% VOUT margining during HALT testing - verifies system robustness under voltage extremes. |
Use Scenario: Supplying programmable 0.6V–5.5V outputs in modular bench power supplies and automated test equipment (ATE) racks. IC Role / Device Role / Timing Role: Digitally reconfigurable power stage with PMBus interface for remote calibration and dynamic voltage adjustment. Use Value: I²C/SMBus programmability allows software-defined output voltage changes without hardware modification - accelerates test setup. |
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 with enhanced thermal performance (θJA = 24°C/W), extended frequency range (up to 1.2MHz), and improved current-sense accuracy (±5% vs ±10%). | Recommended for new designs requiring higher switching frequency or tighter current limiting; not drop-in due to different pinout and NVM structure. | Select ZL2102 when designing new platforms where long-term supply continuity and higher efficiency at light loads are critical. |
| ISL8203M | 3A-rated monolithic buck with PMBus, same 6mm×6mm QFN package but fewer features: no DDC bus, no Snapshot™, no margining, and fixed 300kHz fSW. | Suitable for cost-sensitive, lower-current applications where full ZL2101 feature set is unnecessary - e.g., auxiliary rails in networking gear. | Choose ISL8203M only for ≤3A loads where digital telemetry suffices but advanced power management is not required. |
Compared with ZL2101ALAFTK, ZL2102 offers higher performance and longer lifecycle support but requires board redesign, while ISL8203M provides basic digital control in identical footprint at lower current rating - making ZL2101ALAFTK optimal for legacy 6A designs needing full Digital-DC functionality without migration effort.
Availability
ZL2101ALAFTK is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and test equipment applications requiring stable component supply and long-term obsolescence management.
Supply support for ZL2101ALAFTK 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 (formerly Intersil) is a global semiconductor leader delivering microcontrollers, analog, power, and connectivity solutions for automotive, industrial, and datacenter markets.
The ZL2101 series was developed by Zilker Labs (acquired by Intersil in 2012) specifically for digitally managed, high-density point-of-load conversion in telecom and enterprise systems - emphasizing configurability, telemetry, and multi-device interoperability.
FAQ
What is the recommended operating temperature range for the ZL2101ALAFTK?
The ZL2101ALAFTK is specified for operation from –40°C to +85°C ambient temperature, with a maximum junction temperature of +125°C. Thermal design must ensure θJA remains within limits (28°C/W typical) using the exposed thermal pad connected to SGND. Derating is required above +85°C ambient per the dissipation limits table in the datasheet.
Does the ZL2101ALAFTK support output voltage margining, and how is it implemented?
Yes, the ZL2101ALAFTK supports ±5% output voltage margining via the MGN pin. When asserted, it shifts VOUT by a programmable percentage (set via PMBus or pin-strapping) to validate system robustness during production testing. This function is fully integrated and requires no external components - the ZL2101ALAFTK handles both high-side and low-side margining internally.
Can the ZL2101ALAFTK be synchronized to an external clock source, and what are the timing requirements?
Yes, the ZL2101ALAFTK supports external clock synchronization via the SYNC pin in "SYNC INPUT" mode. It accepts TTL/CMOS-compatible clocks from 200kHz to 1MHz with ±13% frequency drift tolerance. Minimum pulse width is 150ns, and the device automatically detects and locks to the external reference - enabling precise phase alignment across multiple converters.
What protection features does the ZL2101ALAFTK include, and are they configurable?
The ZL2101ALAFTK includes overvoltage (OVP), undervoltage (UVLO), overcurrent (OCP), thermal overload, and pre-bias start-up protection. All thresholds and responses - including OCP trip level (0.2A–9.0A), UVLO hysteresis (0–100%), and thermal shutdown (–40°C to +125°C) - are fully configurable via PMBus commands or pin-strapping, allowing customization per application safety requirements.
Is the ZL2101ALAFTK pin-compatible with other devices in the ZL210x family?
No, the ZL2101ALAFTK is not pin-compatible with ZL2102 or ZL2106. While all share the 36-pin QFN package, pin functions differ significantly - for example, ZL2102 relocates DDC and SALRT, and changes the CFG and FC pin behaviors. Migration requires PCB layout revision and firmware adaptation; ZL2101ALAFTK remains supported for legacy designs but is marked "NOT RECOMMENDED FOR NEW DESIGNS".
ZL2101ALAFTK 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)
ZL2101ALAFTK FAQ
1.How can I place an order for ZL2101ALAFTK through Aetrix?
Please submit a Request for Quotation (RFQ) for ZL2101ALAFTK 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 ZL2101ALAFTK reliable?
The price and inventory of ZL2101ALAFTK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZL2101ALAFTK is usually 5 days.
3.What payment methods are accepted for ZL2101ALAFTK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZL2101ALAFTK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZL2101ALAFTK?
ZL2101ALAFTK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZL2101ALAFTK 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 ZL2101ALAFTK?
For technical support, including ZL2101ALAFTK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZL2101ALAFTK requirements.
6.How does Aetrix verify that ZL2101ALAFTK is sourced from the original manufacturer or authorized distributors?
All ZL2101ALAFTK 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 ZL2101ALAFTK meets industry standards.
7.What is the process for return or replacement of ZL2101ALAFTK?
All ZL2101ALAFTK units undergo pre-shipment inspection (PSI). If there is an issue with ZL2101ALAFTK, 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 ZL2101ALAFTK part is unused and in its original packaging.
Return procedure for ZL2101ALAFTK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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