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Microchip Technology MIC24046YFL-TR
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- Part No.:
- MIC24046YFL-TR
- Manufacturer:
- Microchip Technology
- Package:
- 20-PowerVFQFN
- Datasheet:
-
MIC24046YFL-TR.pdf
- Description:
- IC REG BUCK PROG 5A 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:649
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Product details
Overview
MIC24046YFL-TR from Micrel is a pin-programmable, synchronous step-down DC/DC converter delivering up to 5A output current with 4.5V–19V input range, ±1% output voltage accuracy, and selectable switching frequencies of 400/565/790 kHz. It integrates high-side and low-side N-channel MOSFETs (RDS(ON) = 38 mΩ / 16 mΩ), valley-current-mode control, and internal LDO for analog supply (VDDA = 5.1 V typ.), targeting FPGA, ASIC, and telecom processor core rails.
For engineers reviewing the MIC24046YFL-TR datasheet, MIC24046YFL-TR pinout, MIC24046YFL-TR application, or MIC24046YFL-TR equivalent, key selection criteria include its 20-pin 3mm × 3mm QFN thermal performance (θJA = 29°C/W), programmable output voltages (0.7V–3.3V), hiccup-mode short-circuit protection, and pre-biased start-up capability in multi-rail computing systems.
Technical Context
The MIC24046YFL-TR implements valley-current-mode PWM control with internal slope compensation automatically adapted to input-output differential, frequency, and output voltage range. Its dual-threshold EN/DLY pin enables precise LDO activation (507 mV) followed by power-stage enable (1.21 V), while the open-drain PG output asserts at 92.5% of nominal VOUT with 0.45 ms delay.
Pin-strapping via VOSET0/VOSET1 sets one of nine fixed output voltages; FREQ selects 400/565/790 kHz; ILIM configures low-side current limits of 3.0/4.0/5.0 A (typ.) - all latched after VDDA stabilization. Internal bootstrap diode, 10 Ω VDDA–VDDP resistor, and dedicated AGND/PGND separation support noise-immune gate drive and analog regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 19 V - supports wide-input industrial and telecom supplies without external pre-regulation |
| Max Output Current | 5 A - delivers full rated load with thermal derating per θJA = 29°C/W on standard PCB |
| Output Voltage Accuracy | ±1% - ensures tight regulation across temperature (−40°C to +125°C) and line/load conditions |
| Switching Frequencies | 400 / 565 / 790 kHz - selectable via FREQ pin to balance efficiency vs. size for 1.2 µH or 2.2 µH inductors |
| Low-Side RDS(ON) | 16 mΩ (typ.) - reduces conduction loss and improves light-load efficiency in synchronous buck topology |
| Thermal Shutdown | 160°C with 25°C hysteresis - protects against sustained overload or poor heatsinking in enclosed systems |
| Power Good Threshold | 92.5% of VOUT (rising), 90% (falling) - provides reliable sequencing signal for downstream logic and processors |
Pinout & Package
Package: 20-pin, 3 mm × 3 mm QFN with exposed PGND and VIN thermal pads (θJA = 29°C/W). Requires thermal vias to inner ground plane for junction temperature control within −40°C to +125°C operating range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1–2, VIN_EP) | High-side MOSFET drain / Power train input | Connects to 10 µF ceramic input cap; exposed pad must be thermally coupled to PGND plane |
| PGND (3–4, 13, PGND_EP) | Low-side MOSFET source / Power ground return | Reference for input caps, LX, and VDDP; exposed pad enhances thermal dissipation |
| LX (5–6, LX_EP) | Switch node / Internal FET common connection | Drives external inductor and bootstrap capacitor; exposed pad minimizes switching loop inductance |
| BST (7) | Bootstrap supply for high-side driver | Requires 100 nF ceramic cap between BST and LX; internal diode eliminates external component |
| PG (8) | Open-drain power-good indicator | Pulls low until VOUT reaches 92.5%; needs external pull-up ≤5.5 V, <2 mA current |
| VOSET0 / VOSET1 (9–10) | Output voltage programming inputs | Three-state (GND/VDDA/open) pins selecting 0.7–3.3 V in 9 discrete steps; latched at VDDA startup |
| ILIM (11) | Low-side current-limit selection | Configures 3.0/4.0/5.0 A (typ.) cycle-by-cycle limit; determines safe max load before hiccup entry |
| FREQ (12) | Switching frequency selection | Sets 400/565/790 kHz; higher frequencies allow smaller inductors but increase switching loss |
| AGND (14) | Analog ground reference | Quiet return for COMP, OUTSNS, and error amplifier; must be separated from PGND at single point |
| COMP (15) | Error amplifier output / Compensation node | Drives external RC network to AGND; sets loop bandwidth and phase margin for stability |
| OUTSNS (16) | Output voltage sensing input | Direct connection to point-of-load; high impedance avoids loading; feeds slope compensation generator |
| EN/DLY (17) | Enable with programmable delay | 2 µA pull-up enables RC-based startup delay; dual thresholds (507 mV / 1.21 V) sequence LDO then power stage |
| VDDA (18) | Analog supply rail (5.1 V typ.) | Internal LDO output; bypass with 2.2 µF ceramic to AGND; powers error amp and control logic |
| VDDP (19) | Driver supply rail | Powered from VDDA via internal 10 Ω resistor; bypass with 2.2 µF ceramic to PGND for noise isolation |
| VINLDO (20) | LDO input / Optional separate bias | Can tie to VIN or alternate rail (4.5–5.5 V); decouple with 100 nF ceramic if sourced independently |
Key Features
| Feature | Design Value |
|---|---|
| Valley-current-mode control with auto-slope compensation | Enables stable operation at duty cycles <50% without external compensation tuning |
| Pin-strapped output voltage (0.7–3.3 V) and frequency (400/565/790 kHz) | Eliminates external resistive feedback network and timing components - reduces BOM count and layout area |
| Pre-biased output start-up | Allows safe ramp-up into existing bus voltage without discharging output capacitors - critical for hot-swap and multi-rail sequencing |
| Hiccup-mode short-circuit protection | Enters 3× soft-start wait state after 15 consecutive low-side current-limit events - limits average power dissipation during fault |
| Integrated bootstrap diode and dual-supply LDO (VDDA/VDDP) | Removes need for external bootstrap diode and separates noisy gate-drive supply from sensitive analog rail |
Applications
| Server Core Voltage Regulation | Telecom Baseband Processor Supply |
|---|---|
Use Scenario: Providing tightly regulated 0.9 V or 1.0 V core power to Intel Xeon or AMD EPYC CPUs in 1U rack servers with strict thermal constraints. IC Role / Device Role / Timing Role: Primary synchronous buck regulator managing dynamic load transients up to 5 A with <1% output deviation. Use Value: Pin-selectable 790 kHz switching enables compact 1.2 µH inductor solution while maintaining >85% efficiency at 12 V input. | Use Scenario: Powering multi-core DSPs and FPGAs in LTE/5G remote radio units requiring robust start-up into pre-biased backplane rails. IC Role / Device Role / Timing Role: Core voltage regulator with hiccup-mode fault response and EN/DLY-controlled sequencing relative to FPGA configuration logic. Use Value: Pre-biased start-up prevents reverse current flow into charged output caps; PG signal synchronizes FPGA initialization. |
| Network Router ASIC Supply | Data Storage Controller Rail |
Use Scenario: Delivering 1.2 V/1.5 V to packet-processing ASICs in enterprise routers where EMI compliance requires controlled switching frequency selection. IC Role / Device Role / Timing Role: High-efficiency step-down converter with programmable 565 kHz frequency to avoid noise bands in sensitive SerDes lanes. Use Value: Valley-current-mode control with internal slope compensation ensures stable loop response across full input/output range without custom compensation. | Use Scenario: Generating 1.8 V or 2.5 V for NVMe SSD controllers in high-density storage enclosures with limited airflow. IC Role / Device Role / Timing Role: Thermally optimized DC/DC regulator using QFN thermal pads and θJA = 29°C/W to sustain 5 A continuous load at +85°C ambient. Use Value: Dual ground planes (PGND/AGND) and isolated VDDP supply suppress switching noise coupling into PCIe reference clocks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2451DT-LF-Z | Fixed 3.3 V output; no pin-programmable voltage/frequency; lower 2 A rating; 3x3 QFN-8 package | Suitable only for fixed 3.3 V rails; lacks pre-biased start-up and hiccup protection | Select when cost-sensitive, low-current, fixed-VOUT designs eliminate need for flexibility |
| TPS54560QDGQRQ1 | Wider 3.5–60 V input; adjustable VOUT via resistor divider; 5 A rating; SOIC-10 package with higher θJA | Requires external feedback resistors; no pin-strapped VOUT; automotive AEC-Q100 qualified | Choose for high-input-voltage industrial systems needing qualification, not telecom/server multi-rail flexibility |
Compared with MP2451DT-LF-Z and TPS54560QDGQRQ1, the MIC24046YFL-TR uniquely combines pin-strapped multi-voltage support, valley-current-mode stability across 0.7–3.3 V outputs, and integrated thermal management in a space-constrained 3 mm × 3 mm footprint - making it optimal for dense, multi-rail computing infrastructure where layout area and sequencing control are critical.
Availability
MIC24046YFL-TR is available at Aetrix Electronics and suitable for server motherboard design, telecom base station power delivery, and FPGA/ASIC core voltage regulation requiring stable component supply across extended temperature and long production lifecycles.
Supply support for MIC24046YFL-TR 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
Micrel Inc. was a U.S.-based analog and power IC manufacturer specializing in high-performance DC/DC regulators, Ethernet PHYs, and timing solutions before its acquisition by Microchip Technology in 2015.
The MIC24046 product line targets high-density, multi-rail power architectures in computing and communications equipment, emphasizing pin-programmability, thermal efficiency, and robust fault protection without external passive dependencies.
FAQ
What is the maximum allowable input voltage for the MIC24046YFL-TR?
The MIC24046YFL-TR has an absolute maximum input voltage rating of 20 V, with a recommended operating range of 4.5 V to 19 V. Exceeding 20 V may damage the internal high-side MOSFET or bootstrap circuitry. The device maintains regulation and protection functionality across the full 4.5–19 V range, including at 12 V nominal telecom and server supply rails.
How does the MIC24046YFL-TR achieve pre-biased output start-up?
The MIC24046YFL-TR achieves pre-biased output start-up through internal circuitry that disables reverse current flow during soft-start. When the output voltage is already present at OUTSNS, the controller ramps the internal reference while monitoring the inductor current direction - preventing discharge of the output capacitor. This behavior is inherent to the valley-current-mode architecture and requires no external components or configuration.
What are the exact output voltage options supported by MIC24046YFL-TR pin-strapping?
The MIC24046YFL-TR supports nine discrete output voltages via VOSET0 and VOSET1: 0.7 V, 0.8 V, 0.9 V, 1.0 V, 1.2 V, 1.5 V, 1.8 V, 2.5 V, and 3.3 V. Each combination corresponds to a specific three-state logic state (LOW/HIGH/Hi-Z) on both pins, as defined in the datasheet's Application Information section. No intermediate voltages are available.
Does the MIC24046YFL-TR require an external bootstrap diode?
No, the MIC24046YFL-TR integrates a bootstrap diode internally. The BST pin connects to the top terminal of the external 100 nF bootstrap capacitor, while the bottom terminal connects to LX. During low-side FET conduction, charge transfers from VDDP through the internal diode to the BST capacitor, eliminating the need for an external diode and reducing component count and board area.
What thermal performance can be expected from the MIC24046YFL-TR in a standard PCB layout?
In the reference evaluation board layout, the MIC24046YFL-TR exhibits a junction-to-ambient thermal resistance (θJA) of 29°C/W. With proper implementation - including thermal vias under the PGND and VIN exposed pads connected to inner ground planes - the device sustains 5 A continuous output at ambient temperatures up to +85°C while maintaining junction temperature below +125°C.
MIC24046YFL-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 20-PowerVFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Programmable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 19V
- Voltage - Output (Min/Fixed):
- 0.7V
- Voltage - Output (Max):
- 3.3V
- Current - Output:
- 5A
- Frequency - Switching:
- 400kHz, 565kHz, 790kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (3x3)
MIC24046YFL-TR FAQ
1.How can I place an order for MIC24046YFL-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC24046YFL-TR 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 MIC24046YFL-TR reliable?
The price and inventory of MIC24046YFL-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC24046YFL-TR is usually 5 days.
3.What payment methods are accepted for MIC24046YFL-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC24046YFL-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC24046YFL-TR?
MIC24046YFL-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC24046YFL-TR 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 MIC24046YFL-TR?
For technical support, including MIC24046YFL-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC24046YFL-TR requirements.
6.How does Aetrix verify that MIC24046YFL-TR is sourced from the original manufacturer or authorized distributors?
All MIC24046YFL-TR 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 MIC24046YFL-TR meets industry standards.
7.What is the process for return or replacement of MIC24046YFL-TR?
All MIC24046YFL-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC24046YFL-TR, 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 MIC24046YFL-TR part is unused and in its original packaging.
Return procedure for MIC24046YFL-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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