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onsemi FAN5069MTCX
- Part No.:
- FAN5069MTCX
- Manufacturer:
- onsemi
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
FAN5069MTCX.pdf
- Description:
- IC REG DL BUCK/LNR SYNC 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,097
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Product details
Overview
FAN5069MTCX from onsemi (formerly Fairchild) is a dual-output power management IC integrating a synchronous buck PWM controller and an LDO controller in a single 16-pin TSSOP package. It supports input voltage range of 3V–24V, delivers adjustable PWM output (0.8V–15V) and LDO output (0.8V–3V), and features RDS(ON)-based current sensing, programmable 200–600 kHz switching frequency, and multi-fault protection with optional auto-restart - used in PC/server motherboard VDDQ/VTT rails and FPGA core power supplies.
For engineers reviewing the FAN5069MTCX datasheet, pinout, applications, or equivalent options, key selection considerations include its dual-regulator architecture, shunt-regulated VCC bias for 5V/12V operation, soft-start synchronization between PWM and LDO, RDS(ON) current limit programming, and thermal shutdown at 160°C.
Technical Context
The FAN5069MTCX implements summing-current-mode PWM control with external compensation for fast load transient response and design flexibility. Its current sensing uses the low-side MOSFET's RDS(ON) during off-time, eliminating the need for a discrete sense resistor while enabling lossless cycle-by-cycle overcurrent protection.
It integrates adaptive shoot-through protection via real-time monitoring of high- and low-side gate voltages, dynamically adjusting dead time to prevent simultaneous conduction across varying MOSFETs and operating conditions. The LDO controller operates from a separate input (1.5V–5V) and enables only after SS reaches 2.2V, ensuring coordinated power-up sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 24V - supports wide-input industrial and computing power rails including 5V, 12V, and 24V intermediate bus architectures. |
| PWM Output Range | 0.8V to 15V - configurable for CPU/GPU core, memory (VDDQ), and GTL-type termination (VTT) supplies. |
| LDO Output Range | 0.8V to 3V - designed for low-noise auxiliary rails such as GTL reference or I/O buffers requiring tight regulation. |
| Switching Frequency | 200 kHz to 600 kHz - programmable via RT resistor; higher frequencies enable smaller magnetics but increase switching losses. |
| VCC Shunt Regulation | 5.6V max with 150 mA sink capability - allows direct 12V bias with external RVCC resistor, eliminating need for separate LDO. |
| Soft-Start Control | Single external capacitor controls ramp rate for both PWM and LDO - prevents inrush current and ensures monotonic startup without output overshoot. |
| Thermal Shutdown | 160°C junction temperature - latches off both regulators until EN toggle or VCC recycle, protecting against sustained overload or poor heatsinking. |
Pinout & Package
Package: 16-lead TSSOP (4.4 mm × 5.0 mm, 0.65 mm pitch), RoHS-compliant, industrial-grade (-10°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FBLDO (Pin 1) | LDO feedback input | Regulates LDO output to internal 0.8V reference; connects to resistive divider from LDO_OUT. |
| R(T) (Pin 2) | Oscillator frequency set | Resistor-to-GND sets nominal 200–600 kHz switching frequency; open = 200 kHz. |
| ILIM (Pin 3) | Current limit programming | 10 µA current source sets threshold for cycle-by-cycle overcurrent protection via RILIM. |
| SS (Pin 4) | Soft-start timing | 10 µA charge current ramps capacitor; 1.2V enables fault protection, 2.2V enables LDO output. |
| COMP (Pin 5) | Error amplifier output | Compensation node for PWM loop; connects to FB and external RC network for stability tuning. |
| FB (Pin 6) | PWM feedback input | Inverting input of error amplifier; regulates PWM output to 0.8V reference via external resistor divider. |
| EN (Pin 7) | Enable control | CMOS input; high = enable, low = shutdown; toggling resets fault latch. |
| AGND (Pin 8) | Analog ground reference | Low-impedance return for internal control circuitry; must connect to quiet ground plane. |
| SW (Pin 9) | Switching node | Connects to source of high-side MOSFET and drain of low-side MOSFET; used for RDS(ON) current sensing. |
| HDRV (Pin 10) | High-side gate driver | Drives gate of upper N-channel MOSFET; monitored for adaptive dead-time control. |
| BOOT (Pin 11) | Bootstrap supply | Provides boosted voltage for high-side driver; requires external bootstrap capacitor to PGND. |
| PGND (Pin 12) | Power ground | Return path for low-side driver and power stage; separate from AGND to minimize noise coupling. |
| LDRV (Pin 13) | Low-side gate driver | Drives gate of lower N-channel MOSFET; monitored for adaptive dead-time control. |
| R(RAMP) (Pin 14) | Ramp amplitude control | Resistor-to-VIN sets slope of internal ramp for voltage feed-forward and current limit scaling. |
| VCC (Pin 15) | Bias supply input | Internal shunt regulator maintains ~5.6V; accepts 5V direct or 12V with RVCC resistor. |
| GLDO (Pin 16) | LDO gate drive output | Drives external P-channel MOSFET for LDO pass element; active only after SS > 2.2V. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous buck + LDO combo | Reduces BOM count and board area by integrating two independent regulators with shared control logic and soft-start. |
| RDS(ON) current sensing | Eliminates external current-sense resistor, lowering cost and PCB footprint while maintaining cycle-by-cycle overcurrent protection. |
| Adaptive shoot-through protection | Dynamically adjusts dead time by monitoring actual MOSFET gate voltages - ensures safe commutation across diverse FET selections and temperatures. |
| Shunt-regulated VCC | Enables direct 12V bias without external regulator; internal 150 mA sink simplifies power tree for multi-rail systems. |
| Multi-fault protection | Includes overvoltage (OVP), undervoltage (UVP), overcurrent (OCP), and thermal shutdown - all latching or auto-restart configurable via EN pin. |
Applications
| PC/Server Memory Power | FPGA Core Supply |
|---|---|
Use Scenario: Delivering tightly regulated 1.5V VDDQ and 1.25V VTT_GTL rails on server motherboards with dynamic load steps up to 15A. IC Role / Device Role / Timing Role: FAN5069MTCX acts as primary PWM controller for VDDQ and LDO controller for VTT, providing synchronized soft-start and fast transient response. Use Value: Dual-regulator integration reduces component count by ≥30% versus discrete solutions while maintaining ±1% output accuracy under 10A load steps. | Use Scenario: Powering Xilinx/Altera FPGA core logic requiring stable 1.0V–1.2V at up to 10A with <50 mV droop during 5A/µs transients. IC Role / Device Role / Timing Role: FAN5069MTCX serves as the main buck controller with RDS(ON) sensing and external compensation for bandwidth optimization. Use Value: Summing-current-mode control achieves <10 µs recovery from 0→10A load step, minimizing FPGA configuration errors during high-speed I/O activity. |
| Industrial DC-DC Converter | Communication Processor Supply |
Use Scenario: Generating isolated 3.3V and 1.8V outputs from 24V industrial bus in PLC backplanes with ambient temperatures up to +85°C. IC Role / Device Role / Timing Role: FAN5069MTCX operates as non-isolated pre-regulator feeding downstream isolated modules, leveraging its wide VIN range and thermal shutdown. Use Value: 160°C thermal shutdown prevents field failures in enclosed enclosures; shunt-regulated VCC eliminates need for auxiliary 5V rail. | Use Scenario: Supplying TI OMAP or NXP i.MX processors with dual-core VDD_ARM (1.2V) and VDD_MPU (1.1V) rails requiring independent enable sequencing. IC Role / Device Role / Timing Role: FAN5069MTCX provides PWM-controlled VDD_ARM and LDO-regulated VDD_MPU, with SS pin coordinating ramp timing. Use Value: Single SS capacitor ensures monotonic, glitch-free power-up across both rails - critical for boot ROM initialization integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output power controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP8765GQ-Z | Single-channel synchronous buck controller (no integrated LDO controller); requires external LDO or second controller for dual-rail support. | Not suitable for GTL termination or low-noise auxiliary rails where LDO regulation is mandatory. | Select when only high-efficiency buck regulation is needed and LDO functionality is implemented separately. |
| RTQ2132B-QA | Integrated dual buck controller (no LDO); supports 2-phase interleaving and PMBus interface for telemetry and dynamic voltage scaling. | Lacks analog LDO output for noise-sensitive loads; targets high-performance computing rather than GTL/termination applications. | Choose for advanced digital power management with telemetry, not for legacy GTL or low-noise analog rail requirements. |
Compared with MP8765GQ-Z and RTQ2132B-QA, the FAN5069MTCX uniquely combines PWM and LDO control in one die - enabling compact, low-noise dual-rail designs without external LDOs or complex sequencing ICs, though it lacks digital interface or phase-interleaving capabilities.
Availability
FAN5069MTCX is available at Aetrix Electronics and suitable for PC/server motherboard peripherals, FPGA power supplies, and industrial DC-to-DC converters requiring stable component supply and long-term lifecycle support despite its discontinued-for-new-design status.
Supply support for FAN5069MTCX 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
onsemi (formerly Fairchild Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and IoT applications.
The FAN5069MTCX belongs to onsemi's legacy power controller product line, designed specifically for high-density, multi-rail computing power delivery - targeting desktop, server, and embedded systems requiring integrated PWM+LDO functionality before digital PMICs became mainstream.
FAQ
What is the recommended operating temperature range for the FAN5069MTCX?
The FAN5069MTCX is specified for commercial temperature grade operation from –10°C to +85°C. This range is confirmed in the Ordering Information table and applies to the FAN5069MTCX variant specifically. The industrial-grade variant FAN5069EMTCX extends the lower limit to –40°C, but FAN5069MTCX itself is rated only down to –10°C.
Does the FAN5069MTCX support 12V VCC bias directly?
Yes, the FAN5069MTCX supports 12V VCC bias directly via its internal shunt regulator, which sinks up to 150 mA to maintain VCC at ≤5.6V. An external resistor (RVCC) must be placed between the 12V supply and the VCC pin to limit power dissipation and ensure stable operation - no additional LDO or regulator is required.
How is current limiting configured on the FAN5069MTCX PWM output?
Current limiting on the FAN5069MTCX PWM output is configured using an external resistor (RILIM) connected from Pin 3 (ILIM) to GND. A 10 µA internal current source develops a voltage across RILIM that sets the overcurrent threshold. The actual current limit depends on RDS(ON) of the low-side MOSFET and can be refined using Equation 5 from the datasheet.
Can the FAN5069MTCX operate without an external bootstrap capacitor?
No, the FAN5069MTCX requires an external bootstrap capacitor connected between BOOT (Pin 11) and PGND (Pin 12). This capacitor provides the elevated voltage needed to drive the high-side MOSFET gate above the switching node potential. Omitting it will prevent proper high-side gate drive and cause converter failure.
Is the FAN5069MTCX still recommended for new designs?
No - the FAN5069MTCX is explicitly marked "DISCONTINUED" and "NOT RECOMMENDED FOR NEW DESIGN" in the official datasheet (Rev. 1.1.5, May 2024). It remains available for legacy support and existing production, but onsemi advises contacting their representative for modern alternatives with extended lifetime and enhanced features.
FAN5069MTCX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Topology:
- Step-Down (Buck) Synchronous (1), Linear (LDO) (1)
- Number of Outputs:
- 2
- Frequency - Switching:
- 200kHz
- Voltage/Current - Output 1:
- Controller
- Voltage/Current - Output 2:
- Controller
- Voltage/Current - Output 3:
- -
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- No
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -10°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
FAN5069MTCX FAQ
1.How can I place an order for FAN5069MTCX through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN5069MTCX 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 FAN5069MTCX reliable?
The price and inventory of FAN5069MTCX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN5069MTCX is usually 5 days.
3.What payment methods are accepted for FAN5069MTCX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN5069MTCX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN5069MTCX?
FAN5069MTCX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN5069MTCX 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 FAN5069MTCX?
For technical support, including FAN5069MTCX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN5069MTCX requirements.
6.How does Aetrix verify that FAN5069MTCX is sourced from the original manufacturer or authorized distributors?
All FAN5069MTCX 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 FAN5069MTCX meets industry standards.
7.What is the process for return or replacement of FAN5069MTCX?
All FAN5069MTCX units undergo pre-shipment inspection (PSI). If there is an issue with FAN5069MTCX, 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 FAN5069MTCX part is unused and in its original packaging.
Return procedure for FAN5069MTCX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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