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Microchip Technology MIC33264YGK-TR
- Part No.:
- MIC33264YGK-TR
- Manufacturer:
- Microchip Technology
- Package:
- 20-PowerFQFN
- Datasheet:
-
MIC33264YGK-TR.pdf
- Description:
- IC REG BUCK ADJ 2A 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,314
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Product details
Overview
MIC33264YGK-TR from Micrel is a 4MHz synchronous buck regulator with integrated inductor and HyperLight Load® (HLL) mode, delivering up to 2A output current, 0.7V–5V adjustable output voltage, and 93% peak efficiency. It operates from 2.7V–5.5V input, features 100% duty cycle for low-dropout operation, and targets space-constrained portable and SSD power systems.
For engineers reviewing the MIC33264YGK-TR datasheet, MIC33264YGK-TR pinout, MIC33264YGK-TR application, or MIC33264YGK-TR equivalent, key selection considerations include its integrated inductor solution (4.6mm × 7mm total footprint), 180Ω auto-discharge on SW pin, 33µA quiescent current, and QFN-20 (2.5mm × 3.0mm) thermal performance at −40°C to +125°C junction temperature.
Technical Context
The MIC33264YGK-TR implements a proprietary HyperLight Load® control architecture combining minimum-on/off-time pulse-frequency modulation (PFM) at light loads (<120mA) and fixed 4MHz PWM in continuous conduction mode (>220mA), enabling ultra-fast transient response and high efficiency across full load range. Its integrated PMOS/NMOS power stage drives an internal inductor with 100% duty cycle capability for battery-sustained operation near VOUT.
It includes analog and power ground separation (AGND/PGND), dedicated AVIN decoupling, soft-start programmability via external capacitor, open-drain power-good (PG) with 85–95% VOUT threshold, and thermal shutdown at 160°C. The 180Ω SW pull-down (exclusive to MIC33264) enables automatic output discharge during shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 4MHz nominal in PWM mode; enables compact filter design and reduces EMI fundamental frequency. |
| Output Current | Up to 2A DC; supports high-density point-of-load conversion in portable and SSD applications. |
| Input Voltage Range | 2.7V–5.5V; compatible with single-cell Li-ion, USB, and 3.3V/5V rail inputs. |
| Quiescent Current | 33µA typical; minimizes standby power loss in always-on subsystems. |
| Feedback Reference | 0.7V ±2.5%; sets precise output regulation via external resistor divider (0.7V–5V adjustable). |
| Auto-Discharge | 180Ω internal pull-down on SW pin; discharges output capacitance during shutdown without external circuitry. |
| Thermal Shutdown | 160°C with 20°C hysteresis; protects against sustained overload or poor PCB thermal design. |
| Shutdown Current | 0.1µA max; enables ultra-low-power system sleep states. |
Pinout & Package
Package: 20-pin QFN (GK), 2.5mm × 3.0mm × 1.9mm, RoHS-compliant, halogen-free, matte tin lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVIN (Pins 1, 20) | Power Input Supply | Connects to 2.7–5.5V input rail; requires local 2.2µF+ ceramic bypass to PGND for high-frequency noise suppression. |
| PGND (Pins 2, 8, 9) | Power Ground Return | Low-impedance return path for high-current switching loops; must be separated from AGND and tied at single point. |
| SW (Pins 3–7) | Internal Switch Node | Drives integrated inductor; includes 180Ω internal pull-down (MIC33264 only) for output discharge during shutdown. |
| VOUT (Pins 10–13) | Regulated Output | Delivers up to 2A; connects directly to 22µF+ ceramic output capacitor for ripple filtering and transient response. |
| AGND (Pin 14) | Analog Ground Reference | Reference for FB, SS, PG, and internal control circuits; must be routed separately from PGND and joined at star point. |
| AVIN (Pin 15) | Analog Power Supply | Bias supply for control circuitry; tied to PVIN but requires dedicated 1µF decoupling to minimize noise coupling. |
| SS (Pin 16) | Soft-Start Timing | External capacitor sets ramp time (e.g., 1nF → ~575µs); prevents inrush current and output overshoot at startup. |
| PG (Pin 17) | Power-Good Indicator | Open-drain output asserting high when VOUT ≥ 90% of target; requires external pull-up to VOUT or bias rail. |
| FB (Pin 18) | Feedback Input | Compares divided VOUT to 0.7V reference; sets output voltage via R1/R2 divider per VOUT = 0.7×(1+R1/R2). |
| EN (Pin 19) | Enable Control | Logic-high (>0.8V) enables regulation; logic-low (<0.5V) disables device and activates shutdown mode (0.1µA IQ). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Inductor + MOSFETs | Reduces total solution size to 4.6mm × 7mm; eliminates external magnetics and layout sensitivity. |
| HyperLight Load® (HLL) Mode | Maintains >85% efficiency at 1mA load via PFM operation; extends battery life in idle/sleep states. |
| 100% Duty Cycle Operation | Enables dropout <100mV at 2A (RDS(on) + DCR limited); critical for Li-ion end-of-discharge support. |
| 180Ω Auto-Discharge (MIC33264 only) | Eliminates need for external discharge FET/resistor; ensures rapid, controlled VOUT decay during disable. |
| Low-Radiated EMI | Meets EN55022 Class B without shielding; enabled by integrated power stage and optimized internal routing. |
| Pre-Bias Soft-Start | Allows safe startup into pre-charged output rails without reverse current or instability. |
Applications
| 5V Point-of-Load (POL) | SSD Storage Systems |
|---|---|
Use Scenario: Local 5V rail generation for PCIe interface, NAND flash controllers, or SATA PHY in compact M.2 SSD modules. IC Role / Device Role / Timing Role: Primary step-down regulator converting 5V system rail to stable 3.3V/2.5V/1.8V for memory and controller ICs. Use Value: Integrated inductor eliminates board area and EMI concerns; 4MHz switching allows tiny 22µF output cap and fast transient response to burst read/write loads. | Use Scenario: Power management for embedded SSDs in ultrabooks and edge AI accelerators requiring high reliability and minimal footprint. IC Role / Device Role / Timing Role: High-efficiency POL converter supplying core voltage to NAND controller and DRAM cache under variable workloads. Use Value: HLL mode sustains >85% efficiency at microamp idle currents; 180Ω SW discharge ensures clean reset sequencing between power cycles. |
| Portable Digital Cameras | Low-Voltage Distributed Power |
Use Scenario: Image sensor and ISP power rail in compact digital cameras where thermal headroom and battery runtime are critical. IC Role / Device Role / Timing Role: Main 1.2V/1.8V/2.8V supply for CMOS image sensor and video processing ASIC. Use Value: 93% peak efficiency and 33µA quiescent current maximize battery life; 100% duty cycle extends usable battery range down to 2.8V input. | Use Scenario: Secondary regulation in industrial IoT gateways distributing 3.3V/2.5V to MCU, RF transceivers, and sensors from a 5V backplane. IC Role / Device Role / Timing Role: Isolated, low-noise POL converter decoupled from noisy 5V bus with independent thermal management. Use Value: Separate AGND/PGND pins and advanced copper lead frame reduce ground bounce and improve signal integrity for sensitive analog peripherals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MIC33263YGK-TR | No auto-discharge; SW pin floats during shutdown. | Suitable where output discharge is managed externally or unnecessary. | Select when lowest BOM count is prioritized and discharge not required. |
| TPS62864DLCR | 3.6V–5.5V input, 2A, 2.5MHz, no integrated inductor, 1.2µA IQ, 0.47µH external inductor required. | Requires external magnetics and more PCB area; better suited for designs needing flexible inductor selection or higher VIN. | Choose when input exceeds 5.5V or custom inductance/thermal profile is needed. |
Compared with MIC33263YGK-TR, the MIC33264YGK-TR adds essential auto-discharge for reset-critical systems, while TPS62864DLCR trades integration for wider input range and lower quiescent current-making it viable only when external inductor use is acceptable and 5.5V+ input is present.
Availability
MIC33264YGK-TR is available at Aetrix Electronics and suitable for portable devices, SSD storage systems, 5V point-of-load (POL) conversion, and low-voltage distributed power applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance.
Supply support for MIC33264YGK-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 semiconductor company specializing in high-performance analog, power, timing, and communications ICs before its acquisition by Microchip Technology in 2015. It pioneered integrated power modules with advanced thermal and EMI performance.
The MIC33264YGK-TR belongs to Micrel's HyperLight Load® buck regulator family, designed specifically for space-constrained, battery-sensitive applications demanding ultra-low IQ, fast transient response, and minimal external components.
FAQ
What is the primary function of the SW pin on the MIC33264YGK-TR?
The SW (Switch) pin on the MIC33264YGK-TR connects to the internal power MOSFETs and the integrated inductor. It carries high-frequency switching current and serves as the node between the PMOS high-side switch and NMOS low-side switch. Crucially, the MIC33264YGK-TR includes a 180Ω internal pull-down on this pin during shutdown-enabling automatic discharge of the output capacitor, unlike the MIC33263YGK-TR. This feature ensures safe, controlled power-down in reset-sensitive systems.
How does the MIC33264YGK-TR achieve high efficiency at light loads?
The MIC33264YGK-TR achieves high efficiency at light loads using HyperLight Load® (HLL) mode-a proprietary PFM control scheme that activates below ~120mA. In HLL mode, the regulator minimizes switching activity by pulsing only when needed to maintain regulation, reducing gate-drive and transition losses. This delivers 85% typical efficiency at 1mA, far exceeding standard PWM-only regulators. The 33µA quiescent current and low-RDS(on) MOSFETs further suppress DC losses across the entire load range.
Can the MIC33264YGK-TR operate with an input voltage equal to the output voltage?
Yes, the MIC33264YGK-TR supports 100% duty cycle operation, allowing it to maintain regulation even when the input voltage approaches or equals the output voltage-critical for battery-powered systems nearing end-of-discharge. When VIN drops within ~100mV of VOUT, the high-side PMOS remains continuously on, and the output voltage is determined by the sum of the PMOS RDS(on) drop and the integrated inductor's DCR. This behavior is explicitly characterized in the datasheet and enables extended runtime in single-cell Li-ion applications.
What is the purpose of separating AGND and PGND pins on the MIC33264YGK-TR?
Separating AGND (analog ground) and PGND (power ground) on the MIC33264YGK-TR isolates noise-sensitive control circuitry (FB, SS, PG, error amplifier) from high-current switching paths (PVIN, SW, VOUT). This prevents ground bounce and switching transients from corrupting feedback accuracy or soft-start timing. The datasheet mandates connecting AGND and PGND at a single star point near the IC-ensuring stable regulation, accurate power-good assertion, and minimized output voltage drift under dynamic load conditions.
Does the MIC33264YGK-TR require external compensation components?
No, the MIC33264YGK-TR is internally compensated and designed to be stable with a 22µF ceramic output capacitor (X5R/X7R). However, an external 15pF–68pF feedback capacitor (CFF) connected from FB to AGND is required for optimal transient response and phase margin. This small capacitor dampens high-frequency peaking and improves regulation under fast load steps-without needing full Type-II or Type-III compensation networks common in controller-based buck designs.
MIC33264YGK-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- HyperLight Load®
- Package/Case:
- 20-PowerFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.7V
- Voltage - Output (Max):
- 5V
- Current - Output:
- 2A
- Frequency - Switching:
- 4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (2.5x3)
MIC33264YGK-TR FAQ
1.How can I place an order for MIC33264YGK-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC33264YGK-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 MIC33264YGK-TR reliable?
The price and inventory of MIC33264YGK-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC33264YGK-TR is usually 5 days.
3.What payment methods are accepted for MIC33264YGK-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC33264YGK-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC33264YGK-TR?
MIC33264YGK-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC33264YGK-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 MIC33264YGK-TR?
For technical support, including MIC33264YGK-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC33264YGK-TR requirements.
6.How does Aetrix verify that MIC33264YGK-TR is sourced from the original manufacturer or authorized distributors?
All MIC33264YGK-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 MIC33264YGK-TR meets industry standards.
7.What is the process for return or replacement of MIC33264YGK-TR?
All MIC33264YGK-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC33264YGK-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 MIC33264YGK-TR part is unused and in its original packaging.
Return procedure for MIC33264YGK-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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