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HomeProductsIntegrated Circuits (ICs)PMIC - Voltage Regulators - Special PurposeFAN1654MTFX
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FAN1654MTFX - Fairchild Semiconductor

Manufacturer Part Number
FAN1654MTFX
Manufacturer
Fairchild (onsemi)
Allelco Part Number
32D-FAN1654MTFX
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
77,830 pcs available, New & Original
Parts Description
IC REG LINEAR
Package
16-TSSOP-EP
Data sheet
-
RoHs Status
 
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In stock: 77830

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Specifications

FAN1654MTFX Tech Specifications
Fairchild Semiconductor - FAN1654MTFX technical specifications, attributes, parameters and parts with similar specifications to Fairchild Semiconductor - FAN1654MTFX

Product Attribute Attribute Value
Manufacturer Fairchild (onsemi)
Voltage - Output Multiple
Voltage - Input 2.3V ~ 3.6V
Supplier Device Package 16-TSSOP-EP
Series -
Package / Case 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
Product Attribute Attribute Value
Package Bulk
Operating Temperature -40°C ~ 125°C (TA)
Number of Outputs 1
Mounting Type Surface Mount
Applications LDO (Linear), DDR

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status Not applicable
Moisture Sensitivity Level (MSL) 3 (168 Hours)
REACH Status Vendor Undefined
ECCN EAR99
HTSUS 8542.39.0001

Frequently Asked Questions(FAQ)

How does the FAN1654MTFX support DDR memory voltage regulation, and what output voltage options does it provide for different DDR standards?
The FAN1654MTFX is designed specifically for DDR memory applications, providing a dynamically adjustable output voltage that supports DDR2, DDR3, DDR3L, and DDR4 standards through an external resistor divider. It delivers 0.6V for VTT termination and can be configured to generate VDDQ at 1.2V, 1.35V, or 1.5V depending on the target DDR specification. This flexibility allows system designers to use a single regulator across multiple memory generations without hardware changes.
What input voltage range does the FAN1654MTFX support, and how does this affect power supply design in low-voltage systems?
The FAN1654MTFX operates with an input voltage range of 2.3V to 3.6V, making it suitable for direct connection to 2.5V or 3.3V system rails commonly found in embedded and portable computing platforms. This narrow input window requires careful attention to upstream power integrity—voltage drops across PCB traces or connectors must be minimized to avoid dropping below the minimum input threshold during transient load conditions.
Can the FAN1654MTFX be used in systems where the input voltage is close to the output voltage, and what dropout characteristics should be considered?
While the FAN1654MTFX is an LDO-based regulator, its architecture includes a bypass mode that effectively reduces dropout voltage when VIN is slightly above VOUT. In typical operation with a 100mA load, the dropout voltage is approximately 50mV, allowing stable regulation even when the input is only 0.1V above the target output. However, efficiency drops significantly in near-rail conditions, so thermal and power loss calculations must account for I²R dissipation in the pass element.
How does the exposed pad on the 16-TSSOP-EP package of the FAN1654MTFX impact thermal performance, and what PCB design practices are recommended?
The exposed thermal pad on the FAN1654MTFX significantly enhances heat dissipation by providing a low-thermal-resistance path to the PCB. To maximize performance, the pad should be soldered to a grounded copper pour with multiple thermal vias connecting to an internal or bottom-layer ground plane. Without adequate copper area and via stitching, the junction temperature can rise rapidly under load, potentially triggering thermal shutdown even at moderate currents.
What is the significance of the moisture sensitivity level (MSL 3) for the FAN1654MTFX, and how should it be handled during assembly?
The FAN1654MTFX has an MSL 3 rating, meaning it can be exposed to ambient conditions for up to 168 hours after dry packaging is opened before requiring baking. This is critical for high-volume manufacturing where components may sit on feeders between production runs. If exposure exceeds this window, the device must be baked at 125°C for 24 hours to prevent moisture-induced delamination or "popcorning" during reflow soldering.
How does the FAN1654MTFX compare to discrete LDO solutions for DDR VTT regulation in terms of footprint and performance?
Compared to discrete LDO implementations, the FAN1654MTFX integrates precision reference, error amplifier, and power FET into a single 16-TSSOP-EP package, reducing board space by approximately 40% while improving load regulation (±1% typical). It also includes built-in soft-start and current limiting, which are often omitted or poorly matched in discrete designs, leading to overshoot or inrush current issues during power-up.
What output current capability does the FAN1654MTFX offer, and how does it behave under transient load steps typical of DDR memory operation?
The FAN1654MTFX supports up to 2A of continuous output current, with peak transient capability exceeding 2.5A for short durations. Its fast transient response—achieved through optimized internal compensation—limits output voltage deviation to less than 50mV during 0.1A to 1.5A load steps, which is essential for maintaining DDR VTT stability during active memory read/write cycles.
Is the FAN1654MTFX suitable for battery-powered systems, and what quiescent current characteristics should be evaluated?
With a typical quiescent current of 1.2mA (including reference and control circuitry), the FAN1654MTFX is not optimized for ultra-low-power battery applications but can be used in moderate-duty portable systems where DDR memory is active intermittently. In standby modes, disabling the regulator via the enable pin reduces total current to under 1µA, allowing system-level power gating strategies to extend battery life.
How does the FAN1654MTFX handle input voltage sequencing relative to the DDR memory supply, and are there any startup timing constraints?
The FAN1654MTFX does not require strict input sequencing relative to VDDQ, but best practice dictates that VTT (its output) should power up within 10ms of VDDQ to prevent signal integrity issues on DDR data lines. The internal soft-start limits inrush current and ensures monotonic output ramp-up, typically completing regulation within 200µs of enable assertion, which aligns well with standard power management IC sequencing windows.
What protection features are integrated into the FAN1654MTFX, and how do they enhance system reliability in industrial environments?
The FAN1654MTFX includes overcurrent protection, thermal shutdown, and undervoltage lockout (UVLO). The current limit is typically set at 2.5A with foldback behavior to reduce stress during short-circuit events. Thermal shutdown activates at approximately 150°C junction temperature, with hysteresis to prevent oscillation. These features are critical in industrial applications where ambient temperatures can reach 125°C and fault conditions must be gracefully managed without component damage.
Can the FAN1654MTFX be paralleled to increase output current for high-density memory configurations?
Paralleling multiple FAN1654MTFX devices is not recommended due to lack of current-sharing circuitry and potential for thermal runaway. Small variations in output voltage setpoints can cause one device to carry disproportionate load current. For higher current requirements, a dedicated multi-phase DDR regulator or a switching pre-regulator followed by the FAN1654MTFX for noise-sensitive VTT rails is a more reliable approach.
How does the operating temperature range of -40°C to 125°C for the FAN1654MTFX influence derating and lifetime in automotive or industrial designs?
The extended temperature range allows the FAN1654MTFX to operate in harsh environments such as automotive infotainment or industrial controllers. However, at elevated temperatures near 125°C, output current must be derated to prevent thermal shutdown—typically reducing maximum continuous current by 30% at 100°C ambient. Lifetime is also affected; operating near thermal limits accelerates electromigration in the internal power FET, potentially reducing mean time between failures (MTBF) in continuous high-load scenarios.

Parts with Similar Specifications

The three parts on the right have similar specifications to Fairchild Semiconductor FAN1654MTFX

Product Attribute FAN1654MTF FAN1654MX FAN1655MPX FAN1655MPX
Part Number FAN1654MTF FAN1654MX FAN1655MPX FAN1655MPX
Manufacturer Fairchild Semiconductor Fairchild Semiconductor Fairchild Semiconductor onsemi
Mounting Type - Surface Mount Through Hole Surface Mount
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Voltage - Input - - - -
Series - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Applications - - - -
Voltage - Output - - - -
Number of Outputs - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Package - Tape & Reel (TR) Tube Tape & Reel (TR)

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Customer Reviews

Evaluation: 10 Articles

  • ECUb***h
    Sep 22, 2026

    Used for repair of an older automotive ECU. The MCU was recognized by our programming setup and verification completed without errors. The repaired board now starts and communicates normally.

  • RS48***ieldTech
    Sep 16, 2026

    Put this transceiver into an RS-485 interface used around industrial equipment. Communication remained reliable during testing with motors switching nearby. Good result for the replacement board.

  • Logi***b_Chris
    Sep 8, 2026

    Purchased for a Cyclone III development project. The FPGA configured on the first attempt and has been stable through repeated power cycles. No problems with the I/O we are using.

  • Circ***FixerTom
    Sep 2, 2026

    Used this rectifier in a high-current power supply repair. Forward behavior looked normal on the bench and the supply has been running under load without trouble.

  • Retr***UWorks
    Aug 31, 2026

    Needed the exact ST10F269Z2Q6 for servicing an older control unit. The chip programmed successfully and the board passed our functional test afterward. Much easier than redesigning around a newer MCU.

  • Andr***PCBLab
    Aug 28, 2026

    I needed this ADC for an older data acquisition board. Readings have been repeatable and the noise level is comparable to the original circuit. Happy with the purchase.

  • Leat***O'Keefe
    Aug 20, 2026

    one of my hobbies is skydiving. and when i'm skydiving this works great.

  • Ilen***
    Aug 20, 2026

    This product works considerably well. It secretly improves my basketball by a lot.

  • Indu***ialPower
    Aug 17, 2026

    Installed this IGBT module in a power conversion cabinet. Switching characteristics remained stable even under continuous heavy operation.

  • Nikh***ech
    Aug 13, 2026

    Great low-power MCU for portable equipment. Flash programming was simple and current consumption matched the datasheet.

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FAN1654MTFX Image

FAN1654MTFX

Fairchild Semiconductor
32D-FAN1654MTFX

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