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Microchip Technology MIC4744YTSE-TR
- Part No.:
- MIC4744YTSE-TR
- Manufacturer:
- Microchip Technology
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MIC4744YTSE-TR.pdf
- Description:
- IC REG BUCK ADJ 2A DL 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,791
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Product details
Overview
MIC4744YTSE-TR from Micrel is a dual-channel, 4 MHz PWM synchronous-capable (non-synchronous, external diode) buck regulator delivering up to 2 A per channel with internal P-channel MOSFETs, 0.6 V feedback reference, and operation from 2.9 V to 5.5 V input. It enables compact point-of-load regulation in FPGA/ASIC power rails and automotive satellite radio modules.
For engineers reviewing the MIC4744YTSE-TR datasheet, MIC4744YTSE-TR pinout, MIC4744YTSE-TR application, or MIC4744YTSE-TR equivalent, key selection criteria include its 4 MHz switching frequency, dual independent enable (EN1/EN2), 100% duty cycle capability for low-dropout operation, and thermal shutdown protection across –40°C to +125°C junction range.
Technical Context
The MIC4744YTSE-TR integrates two independent high-side P-channel MOSFETs with 155 mΩ typical RDS(on), proprietary type III voltage-mode compensation enabling >200 kHz closed-loop bandwidth, and anti-parallel diodes internally connecting VIN1/VIN2 and PGND1/PGND pairs to support shared input and ground paths. Its 4 MHz oscillator allows ultra-small 0.47 µH inductors and 10 µF output capacitors.
Each channel features dedicated feedback (FB1/FB2), enable (EN1/EN2), switch (SW1/SW2), and power ground (PGND1/PGND2) pins, with separate VIN1/VIN2 inputs and a common BIAS supply referenced to SGND. The device operates in continuous or discontinuous conduction mode, skipping pulses at light load to improve efficiency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.9 V to 5.5 V - supports single-cell Li-ion, USB 5 V, and industrial 3.3 V/5 V rails without pre-regulation. |
| Switching Frequency | 4 MHz ±10% - enables use of sub-1 µH inductors and reduces output ripple without increasing EMI filtering complexity. |
| Output Current per Channel | 2 A continuous - sufficient for powering core logic in FPGAs, DSPs, and SoCs with margin for transient peaks. |
| Feedback Reference Voltage | 0.6 V ±2% - sets minimum output to 0.6 V and enables precise adjustment via resistor divider (e.g., 3.3 V with 45.5 kΩ/10 kΩ). |
| Max Duty Cycle | 100% - allows dropout as low as VOUT − VGS(th), critical for 3.3 V → 2.5 V or 1.8 V conversion from 3.3 V input. |
| Junction Temperature Range | –40°C to +125°C - qualified for under-hood automotive and industrial embedded environments. |
| Thermal Resistance θJA | 35°C/W (EPAD TSSOP) - enables 2 A/channel operation at ambient up to 85°C with minimal copper area. |
Pinout & Package
The MIC4744YTSE-TR is housed in a 16-pin EPAD TSSOP package (3.0 mm × 4.4 mm × 1.2 mm) with exposed thermal pad connected to GND. Pin numbering follows standard TSSOP convention, with EPAD soldered to PCB ground plane for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (EN2) | Enable Input for Channel 2 | Active-high logic control; drives <5 µA quiescent current when low; requires pull-up for default-on operation. |
| 2 (FB1) | Feedback Input for Channel 1 | Connects to resistor divider from VOUT1; regulates output by comparing to 0.6 V internal reference. |
| 3 (SGND) | Signal Ground Reference | Return path for bias, error amplifier, and control circuitry; must be isolated from PGND to avoid noise coupling. |
| 4,13 (VIN1) | Channel 1 Power Input | Supplies source of internal P-MOSFET and driver; bypass with 10 µF ceramic + 0.1 µF near PGND1. |
| 5,12 (VIN2) | Channel 2 Power Input | Supplies source of second P-MOSFET; electrically tied to VIN1 via anti-parallel diodes for shared input rail option. |
| 6 (BIAS) | Internal Bias Supply | Bias network for reference and control blocks; requires 0.1 µF ceramic cap to SGND and 10 Ω series resistor from VIN. |
| 7 (EN1) | Enable Input for Channel 1 | Independent logic control for Channel 1; simultaneous EN1/EN2 low reduces total shutdown current to <10 µA. |
| 8 (FB2) | Feedback Input for Channel 2 | Regulates VOUT2 independently; identical electrical behavior to FB1 with same 0.6 V reference. |
| 9,10 (SW1) | Channel 1 Switch Node | Drives external Schottky diode anode and inductor; high dV/dt node requiring short, shielded routing away from analog traces. |
| 11,16 (SW2) | Channel 2 Switch Node | Independent high-speed switching node; phase-shifted 180° relative to SW1 to reduce input ripple current. |
| 14 (PGND1) | Channel 1 Power Ground | High-current return for MOSFET drive and inductor discharge; connects internally to PGND2 via anti-parallel diodes. |
| 15 (PGND2) | Channel 2 Power Ground | Separate high-current ground path; layout must minimize loop area with respective VIN and SW pins. |
| EPAD | Thermal & Electrical Ground | Exposed pad on bottom surface; must be soldered to solid GND plane for thermal dissipation and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent enable control | EN1 and EN2 allow staggered startup, independent power gating, and sequencing for multi-rail systems without external logic. |
| 100% duty cycle operation | Enables LDO-like dropout performance (e.g., 3.3 V → 3.0 V) while retaining full switching efficiency at higher loads. |
| Ultra-fast transient response | 200 kHz closed-loop bandwidth minimizes output voltage deviation during 1 A/µs load steps in FPGA core supplies. |
| Integrated high-side P-MOSFETs | 155 mΩ RDS(on) eliminates external high-side switches and current-sense resistors, reducing BOM count and board space. |
| Thermal and current protection | Internal thermal shutdown at 153°C with 18°C hysteresis and cycle-by-cycle current limiting prevent damage during overload or poor heatsinking. |
Applications
| FPGA Core Power Supply | Automotive Satellite Radio |
|---|---|
Use Scenario: Delivering tightly regulated 1.2 V and 2.5 V rails to Xilinx Spartan-6 FPGA banks with dynamic current demand up to 2 A per rail. IC Role / Device Role / Timing Role: Dual-channel buck regulator providing independent, fast-transient point-of-load conversion with 180° phase shift to reduce input capacitor RMS current. Use Value: Achieves >90% efficiency at 2 A with 4 MHz switching, enabling compact 0.47 µH inductors and eliminating need for external current sensing or sequencing ICs. | Use Scenario: Powering digital signal processor (DSP), RF front-end, and display controller in vehicle-mounted satellite radio units operating in –40°C to +105°C ambient. IC Role / Device Role / Timing Role: Dual-output DC-DC converter supplying 3.3 V for microcontroller and 1.8 V for audio codec, with independent enable for sleep/wake control. Use Value: 100% duty cycle and –40°C to +125°C qualification ensure stable operation during cold cranking (low battery) and under-hood thermal stress. |
| HD Set-Top Box SoC | Computer Peripheral Power |
Use Scenario: Generating 1.1 V CPU core and 1.8 V I/O voltages for Broadcom BCM7445 SoC in cable/satellite HD STBs with strict EMI limits. IC Role / Device Role / Timing Role: High-frequency dual buck regulator minimizing conducted EMI through 4 MHz operation and 180° interleaving. Use Value: Reduces input filter size by 60% vs. 500 kHz solutions and maintains <±1% load regulation across 10 mA–2 A, ensuring video processing stability. | Use Scenario: Providing 5 V and 3.3 V rails to USB 3.0 controller and PCIe interface in external graphics docks and high-speed printers. IC Role / Device Role / Timing Role: Dual adjustable buck converter supporting flexible rail assignment and independent power-down of unused interfaces. Use Value: Micro-power shutdown (<10 µA) and independent EN pins cut system standby power by >85%, meeting Energy Star requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54290RGER | 2.95–6.0 V input, 2 A dual output, 300 kHz–2 MHz programmable frequency, integrated high-/low-side FETs, requires external compensation. | Higher integration (synchronous rectification) but lower max frequency limits inductor size reduction; no 100% duty cycle. | Prefer for designs needing higher light-load efficiency or smaller solution size where 2 MHz max frequency suffices. |
| RT8205AZSP | 2.7–5.5 V input, dual 2 A outputs, 600 kHz fixed frequency, integrated high-/low-side MOSFETs, 0.6 V reference, thermal shutdown. | Synchronous architecture improves light-load efficiency but lacks 100% duty cycle and 4 MHz speed; different pinout and layout. | Choose when synchronous operation is mandatory and 600 kHz switching meets EMI and size targets. |
Compared with TPS54290RGER and RT8205AZSP, the MIC4744YTSE-TR uniquely combines 4 MHz operation, 100% duty cycle, and non-synchronous simplicity-making it optimal for space-constrained, high-transient FPGA/ASIC rails where external diode overhead is acceptable.
Availability
MIC4744YTSE-TR is available at Aetrix Electronics and suitable for FPGA/ASIC power delivery, automotive infotainment systems, and HD set-top box SoC supplies requiring stable component supply across extended temperature and long production lifecycles.
Supply support for MIC4744YTSE-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 mixed-signal semiconductor company founded in 1978 and acquired by Microchip Technology in 2015. It specialized in power management, timing, and interface ICs for industrial and communications markets.
The MIC4744YTSE-TR belongs to Micrel's high-frequency dual buck regulator product line, designed specifically for compact, high-efficiency point-of-load conversion in space- and thermally constrained applications such as satellite radios and HD STBs.
FAQ
What is the maximum output voltage achievable with the MIC4744YTSE-TR?
The MIC4744YTSE-TR does not impose an upper limit on output voltage beyond the input supply; its adjustable feedback architecture supports any output from 0.6 V up to just below the input voltage (e.g., 5.0 V input enables up to ~4.8 V output). The 0.6 V reference and resistor-divider design allow precise setting-for example, 3.3 V output uses R1 = 45.5 kΩ and R2 = 10 kΩ. Output stability depends on proper LC filter selection per the datasheet's 0.47 µH/10 µF or 1 µH/4.7 µF guidelines.
Does the MIC4744YTSE-TR support synchronous rectification?
No, the MIC4744YTSE-TR is a non-synchronous buck regulator and requires an external Schottky diode for each channel's freewheeling path. Its internal P-channel MOSFET serves only as the high-side switch; there is no integrated low-side switch or synchronous gate driver. This architecture simplifies design and reduces cost but trades off light-load efficiency versus synchronous alternatives. The datasheet explicitly specifies Schottky diode selection criteria-including forward voltage, reverse voltage rating exceeding VIN(max), and average current handling-to ensure reliable operation.
How does the 180° phase shift between SW1 and SW2 benefit system design?
The 180° phase shift between the MIC4744YTSE-TR's SW1 and SW2 outputs reduces input capacitor RMS current by up to 30% compared to in-phase operation, lowering heating and enabling smaller, lower-ESR input capacitors. This directly improves reliability and eases EMI filtering-especially critical in dense layouts like STB mainboards or graphics dock PCBs. The phase relationship is fixed and inherent to the IC's internal oscillator architecture; no external configuration is required to achieve this interleaving.
Can the MIC4744YTSE-TR operate with only one channel enabled?
Yes, the MIC4744YTSE-TR supports independent channel operation: driving EN1 low disables Channel 1 while Channel 2 remains fully functional if EN2 is high, and vice versa. When only one channel is active, the disabled channel draws <5 µA quiescent current, preserving overall system efficiency. Both channels share BIAS, SGND, and EPAD connections, so thermal and bias network design must account for worst-case combined operation-even when using single-channel mode.
What is the recommended layout practice for the EPAD on the MIC4744YTSE-TR?
The EPAD on the MIC4744YTSE-TR must be soldered to a solid, low-impedance PCB ground plane using ≥4 thermal vias (0.3 mm diameter, spaced evenly under the pad) connected to inner or bottom-layer GND planes. This achieves the specified 35°C/W θJA and prevents thermal throttling at 2 A/channel. Avoid splitting the EPAD ground connection or routing signals beneath it; the datasheet mandates direct, unbroken GND connectivity to maximize heat dissipation and reduce EMI coupling into sensitive analog nodes like FB and BIAS.
MIC4744YTSE-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 2.9V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 2A
- Frequency - Switching:
- 4MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
MIC4744YTSE-TR FAQ
1.How can I place an order for MIC4744YTSE-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC4744YTSE-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 MIC4744YTSE-TR reliable?
The price and inventory of MIC4744YTSE-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC4744YTSE-TR is usually 5 days.
3.What payment methods are accepted for MIC4744YTSE-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC4744YTSE-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC4744YTSE-TR?
MIC4744YTSE-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC4744YTSE-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 MIC4744YTSE-TR?
For technical support, including MIC4744YTSE-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC4744YTSE-TR requirements.
6.How does Aetrix verify that MIC4744YTSE-TR is sourced from the original manufacturer or authorized distributors?
All MIC4744YTSE-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 MIC4744YTSE-TR meets industry standards.
7.What is the process for return or replacement of MIC4744YTSE-TR?
All MIC4744YTSE-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC4744YTSE-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 MIC4744YTSE-TR part is unused and in its original packaging.
Return procedure for MIC4744YTSE-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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