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Microchip Technology MIC24046-HYFL-TR
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- Part No.:
- MIC24046-HYFL-TR
- Manufacturer:
- Microchip Technology
- Package:
- 20-PowerVFQFN
- Datasheet:
-
MIC24046-HYFL-TR.pdf
- Description:
- IC REG BUCK PROG 5A 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,237
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Product details
Overview
MIC24046-HYFL-TR from Micrel Inc. 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 (400/565/790 kHz). It serves as the primary core power supply for FPGAs, DSPs, and low-voltage ASICs in servers and telecom base stations.
For engineers reviewing the MIC24046-HYFL-TR datasheet, MIC24046-HYFL-TR pinout, MIC24046-HYFL-TR application, or MIC24046-HYFL-TR equivalent, key selection considerations include valley-current-mode control stability, pre-biased output start-up capability, programmable current limit (4.6A/6.2A/6.8A), thermal shutdown at 160°C, and 20-pin 3mm × 3mm QFN package layout constraints.
Technical Context
The MIC24046-HYFL-TR implements valley-current-mode PWM control with internal slope compensation automatically adapted to input voltage, output voltage, and selected frequency. Its dual-threshold EN/DLY pin enables precise LDO activation (507 mV) followed by power-stage enable (1.21 V) with 150 mV hysteresis.
It integrates high-side (38 mΩ typ.) and low-side (16 mΩ typ.) N-channel MOSFETs, an internal 5.1 V LDO (VDDA), gate driver supply filtering via internal 10 Ω resistor between VDDA and VDDP, and hiccup-mode short-circuit protection triggered after 15 consecutive low-side current-limit events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 19 V - supports wide industrial and telecom input rails including 5 V, 12 V, and 15 V systems. |
| Max Output Current | 5 A - continuous rated load capacity with thermal derating above +125°C junction temperature. |
| Output Voltage Accuracy | ±1 % - ensures tight regulation across temperature and line/load variations for sensitive digital loads. |
| Switching Frequency | 400 / 565 / 790 kHz - selectable via FREQ pin to balance efficiency, size, and EMI in compact layouts. |
| Current Limit Options | 4.6 A / 6.2 A / 6.8 A - programmable low-side valley current thresholds matching 3 A / 4 A / 5 A system requirements. |
| Junction Temp Range | −40°C to +125°C - qualified for harsh environments including base station outdoor units and server backplanes. |
| Package | 20-pin 3 mm × 3 mm QFN - thermally enhanced with exposed VIN and PGND pads for PCB-level heat sinking. |
Pinout & Package
20-pin 3 mm × 3 mm QFN package with exposed VIN_EP, PGND_EP, and LX_EP pads for thermal management and low-inductance power routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1–2, VIN_EP) | High-side MOSFET drain / power input | Primary buck input node; requires local 10 µF ceramic bypass to PGND with multi-capacitor staging. |
| PGND (3–4, 13, PGND_EP) | Power ground return | Source terminal for low-side MOSFET and return for input capacitors; must connect directly to thermal vias. |
| LX (5–6, LX_EP) | Switch node | Connection point for external inductor and bootstrap capacitor; high dv/dt node requiring minimized loop area. |
| BST | Bootstrap supply | Drives high-side gate via internal bootstrap diode; connects top of 100 nF ceramic capacitor to LX. |
| VOSET0 / VOSET1 | Output voltage programming | Three-state pins defining nine discrete output voltages (0.7 V to 3.3 V) without external resistors. |
| ILIM | Current limit selection | Three-state pin setting low-side valley current threshold (4.6 A / 6.2 A / 6.8 A) for overload protection. |
| FREQ | Frequency selection | Three-state pin selecting 400 kHz (Hi-Z), 565 kHz (GND), or 790 kHz (VDDA) for EMI and filter optimization. |
| EN/DLY | Enable & delay control | Dual-threshold input (507 mV for LDO, 1.21 V for power stage) with 2 µA pull-up enabling RC-based startup delay. |
| OUTSNS | Output voltage sensing | Kelvin connection point to regulated output; eliminates PCB trace resistance error in feedback path. |
| COMP | Error amplifier output | Transconductance amplifier output driving external Type II/III compensation network referenced to AGND. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-programmable output voltage | Nine factory-trimmed settings (0.7 V–3.3 V) eliminate external feedback resistors and improve accuracy vs. resistor-divider drift. |
| Valley-current-mode control | Enables stable operation at duty cycles <50% with internal adaptive slope compensation-no external components required. |
| Pre-biased output start-up | Allows safe turn-on into existing output voltage without discharging bulk capacitors-critical for hot-swap and rail sequencing. |
| Hiccup-mode short-circuit protection | Reduces average power dissipation during sustained faults by tri-stating MOSFETs for 3× soft-start time after 15 current-limit events. |
| Integrated LDO and supply filtering | VDDA (5.1 V) and VDDP supplies are internally decoupled via 10 Ω resistor, minimizing noise coupling between analog and power domains. |
Applications
| Server Core Power | Telecom Base Station RF Power |
|---|---|
Use Scenario: Providing 1.2 V @ 5 A to FPGA fabric and I/O banks in 1U rack-mounted servers with strict thermal envelope limits. IC Role / Device Role / Timing Role: Primary synchronous buck regulator implementing valley-current-mode control with programmable soft-start and pre-bias tolerance. Use Value: Enables single-chip 5 A solution with <1% output error and 90%+ efficiency at full load-reducing board area vs. multi-phase controllers. | Use Scenario: Delivering 3.3 V @ 3 A to RF front-end amplifiers and clock distribution ICs in outdoor macrocell base stations operating at −40°C to +85°C ambient. IC Role / Device Role / Timing Role: High-reliability point-of-load regulator with thermal shutdown (160°C) and hiccup-mode fault recovery for unattended operation. Use Value: Maintains regulation under wide input transients (4.5 V–19 V) and survives repeated short-circuit events without latch-off or damage. |
| FPGA I/O Bank Supply | Low-Voltage ASIC Core Rail |
Use Scenario: Generating 1.8 V @ 4 A for FPGA I/O banks requiring fast transient response and minimal voltage droop during burst data transfers. IC Role / Device Role / Timing Role: Fast-response buck converter using transconductance error amplifier (1.5 mmho) and external COMP compensation. Use Value: Achieves <10 µs transient recovery with programmable current limit (6.2 A) preventing false triggering during dynamic load steps. | Use Scenario: Supplying 0.9 V @ 5 A to 7 nm ASIC cores in networking switches where output accuracy and thermal margin are critical. IC Role / Device Role / Timing Role: Precision-regulated core supply with ±1% DC accuracy and Kelvin-sensed OUTSNS feedback eliminating PCB IR drop error. Use Value: Guarantees functional correctness across process/voltage/temperature corners without calibration or trimming. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4420AGL-A-Z | 4.5 V–60 V input, 2 A max, fixed 500 kHz fSW, no pin-programmable VOUT | Higher input range but lower current rating; lacks pre-biased start-up and valley-mode control | Select when >19 V input or smaller footprint needed; not suitable for 5 A FPGA core rails. |
| TPS54560QDGQRQ1 | 3.5 V–60 V input, 5 A, adjustable VOUT via resistor divider, peak-current-mode control | Requires external feedback resistors; no pin-strappable VOUT/FREQ/ILIM; automotive-grade (-40°C to +125°C) | Choose for AEC-Q100 compliance or wider VIN; accept added BOM cost and reduced accuracy vs. MIC24046-HYFL-TR's integrated DAC. |
Compared with MPQ4420AGL-A-Z and TPS54560QDGQRQ1, the MIC24046-HYFL-TR uniquely combines pin-programmable VOUT/FREQ/ILIM, valley-current-mode stability at low duty cycles, and pre-biased start-up-enabling simpler, more accurate, and more robust 5 A POL designs without external feedback or complex compensation.
Availability
MIC24046-HYFL-TR is available at Aetrix Electronics and suitable for server power delivery, telecom base station RF modules, and FPGA/ASIC point-of-load applications requiring stable component supply, long-term lifecycle support, and Pb-free RoHS-compliant packaging.
Supply support for MIC24046-HYFL-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., acquired by Microchip Technology in 2015, specialized in high-performance analog, power management, and timing solutions for communications and computing infrastructure.
The MIC24046-HYFL-TR belongs to Micrel's high-efficiency, pin-programmable buck regulator family designed specifically for multi-rail, space-constrained digital power systems in servers, routers, and base stations.
FAQ
What input voltage range does the MIC24046-HYFL-TR support?
The MIC24046-HYFL-TR supports an input voltage range of 4.5 V to 19 V, making it compatible with standard intermediate bus voltages such as 5 V, 12 V, and 15 V used in computing and telecom systems. Absolute maximum rating is 20 V, and operation below 4.5 V will disable regulation. This range allows the MIC24046-HYFL-TR to serve as a robust front-end converter in diverse power architectures without external pre-regulation.
How is output voltage programmed on the MIC24046-HYFL-TR?
The MIC24046-HYFL-TR uses two three-state pins-VOSET0 and VOSET1-to select one of nine factory-trimmed output voltages (0.7 V, 0.8 V, 0.9 V, 1.0 V, 1.2 V, 1.5 V, 1.8 V, 2.49 V, and 3.3 V). Each pin accepts GND, VDDA, or Hi-Z states, eliminating external feedback resistors and ensuring ±1% accuracy over temperature and line/load conditions. This configuration is defined in Table 2 of the MIC24046-HYFL-TR datasheet.
Does the MIC24046-HYFL-TR support start-up into a pre-biased output?
Yes, the MIC24046-HYFL-TR supports safe start-up into a pre-biased output without discharging output capacitors-a critical feature for hot-swap and rail-sequencing applications. This behavior is enabled by its valley-current-mode architecture and internal control logic, which prevents reverse current flow during initial ramp-up. The MIC24046-HYFL-TR maintains this capability across all pin-programmed output voltages and current-limit settings.
What protection features are integrated into the MIC24046-HYFL-TR?
The MIC24046-HYFL-TR integrates cycle-by-cycle overcurrent protection on both high-side and low-side MOSFETs, hiccup-mode short-circuit recovery (triggered after 15 consecutive low-side current-limit events), thermal shutdown at 160°C with 25°C hysteresis, internal soft-start, and input undervoltage lockout. These protections operate independently of external components and remain active during all operating modes-including pre-biased start-up and light-load PFM operation.
What is the thermal performance of the MIC24046-HYFL-TR in its QFN package?
The MIC24046-HYFL-TR uses a 20-pin 3 mm × 3 mm QFN package with exposed VIN_EP and PGND_EP thermal pads. Its junction-to-ambient thermal resistance (θJA) is 29°C/W when mounted on the reference evaluation board. With proper PCB layout-including ≥6 thermal vias per exposed pad connected to internal ground planes-the MIC24046-HYFL-TR sustains 5 A continuous output at +125°C junction temperature in typical 4-layer server PCBs.
MIC24046-HYFL-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)
MIC24046-HYFL-TR FAQ
1.How can I place an order for MIC24046-HYFL-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC24046-HYFL-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 MIC24046-HYFL-TR reliable?
The price and inventory of MIC24046-HYFL-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC24046-HYFL-TR is usually 5 days.
3.What payment methods are accepted for MIC24046-HYFL-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC24046-HYFL-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC24046-HYFL-TR?
MIC24046-HYFL-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC24046-HYFL-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 MIC24046-HYFL-TR?
For technical support, including MIC24046-HYFL-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC24046-HYFL-TR requirements.
6.How does Aetrix verify that MIC24046-HYFL-TR is sourced from the original manufacturer or authorized distributors?
All MIC24046-HYFL-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 MIC24046-HYFL-TR meets industry standards.
7.What is the process for return or replacement of MIC24046-HYFL-TR?
All MIC24046-HYFL-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC24046-HYFL-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 MIC24046-HYFL-TR part is unused and in its original packaging.
Return procedure for MIC24046-HYFL-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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