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Microchip Technology MIC2245YML-TR
- Part No.:
- MIC2245YML-TR
- Manufacturer:
- Microchip Technology
- Package:
- 10-VFDFN Exposed Pad, 10-MLF®
- Datasheet:
-
MIC2245YML-TR.pdf
- Description:
- IC REG BUCK ADJ 500MA 10MLF
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MIC2245YML-TR from Micrel is a 4MHz synchronous buck regulator with integrated LOWQ™ LDO standby mode, operating from 2.7V–5.5V input and delivering up to 500mA in PWM mode or 60mA in LDO mode. It features 18µA quiescent current in LDO mode, 75µVrms output noise, and 100% duty cycle capability for low-dropout operation-ideal for battery-powered portable systems requiring ultra-low-noise power during sleep states.
For engineers reviewing the MIC2245YML-TR datasheet, MIC2245YML-TR pinout, MIC2245YML-TR application, or MIC2245YML-TR equivalent, this device offers dual-mode regulation (PWM + LDO), fast transient response, adjustable 1V–5.5V output via feedback divider, and compatibility with tiny 1µH inductors and 4.7µF ceramic output capacitors-critical for space-constrained USB peripherals and handheld devices.
Technical Context
The MIC2245YML-TR integrates two independent regulation paths: a 4MHz constant-frequency synchronous buck converter with internal high-side P-channel and low-side N-channel MOSFETs, and a parallel low-noise linear regulator activated via the LOWQ pin. Its dual-path architecture enables seamless handoff between modes without output voltage disturbance.
Control logic uses an internal 1.0V reference and type III compensation optimized for 1µH/4.7µF LC networks. The BIAS pin requires an RC filter (≥20.5Ω + 100nF) to suppress switching noise from AVIN, ensuring stable analog biasing for both PWM and LDO sections across –40°C to +125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports single-cell Li-ion, Li-polymer, and USB 5V rails without external pre-regulation. |
| Output Current (PWM) | Up to 500mA - sufficient for core logic or RF subsystems in portable electronics. |
| Output Current (LDO) | Up to 60mA - maintains clean supply for real-time clocks or sensor interfaces during system sleep. |
| Quiescent Current (LDO) | 20µA typical - extends battery life in standby by minimizing leakage while preserving regulation. |
| Output Noise (LDO) | 75µVrms (10Hz–100kHz) - avoids interference with sensitive analog circuits like ADCs or audio codecs. |
| Oscillator Frequency | 4MHz ±10% - enables use of sub-2mm inductors and reduces EMI filtering requirements. |
| Duty Cycle Max | 100% - allows operation with VIN as low as VOUT + dropout (e.g., 1.8V out from 1.91V input). |
| Feedback Reference | 1.0V ±2% - simplifies resistor-divider design for precise adjustable outputs down to 1V. |
Pinout & Package
Package: 10-pin 3mm × 3mm MLF™ (MicroLeadFrame) with exposed thermal pad (EP), rated for –40°C to +125°C junction temperature and θJA = 60°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 AGND | Analog ground reference | Separate low-noise return path for FB, BIAS, and AVIN-must be isolated from PGND to prevent switching noise coupling. |
| 2 LDO | LDO output terminal | Connects directly to VOUT; provides regulated output in LOWQ=LOW mode; high-impedance in PWM mode. |
| 3 BIAS | Analog bias supply input | Requires RC filter (20.5Ω + 100nF) from VIN to reject high-frequency noise before powering control circuitry. |
| 4 AVIN | Analog supply input | Powers LDO and error amplifier; must tie to VIN but routed separately to avoid SW node noise injection. |
| 5 FB | Feedback input | Senses output voltage via resistor divider; 1V reference enables accurate 1V–5.5V adjustable outputs. |
| 6 EN | Enable control input | Logic-low (<0.5V) disables entire IC, reducing IQ to <5µA; open-drain compatible with microcontroller GPIO. |
| 7 LOWQ | Mode select input | Logic-low activates LDO mode (20µA IQ); logic-high enables 4MHz PWM mode (500mA output). |
| 8 VIN | Main power input | Supplies internal MOSFETs; requires 1µF ceramic capacitor placed adjacent to PGND for high-frequency decoupling. |
| 9 SW | Switch node output | Drives external inductor; high dv/dt node-must be short, shielded, and远离 sensitive analog traces. |
| 10 PGND | Power ground return | High-current return path for MOSFETs and inductor; forms tight loop with VIN and SW to minimize EMI. |
| EP | Exposed thermal pad | Internally connected to GND; must be soldered to PCB thermal plane for thermal performance and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| LOWQ™ dual-mode operation | Seamless transition between 500mA PWM and 60mA ultra-low-noise LDO-no output glitch or voltage dip during mode change. |
| Integrated MOSFETs | Eliminates need for external high-side P-channel and low-side N-channel switches-reduces BOM count and layout complexity. |
| 100% duty cycle capability | Enables dropout operation at light loads (e.g., 1.8V output from 1.91V input), extending usable battery range. |
| Ultra-fast transient response | Stabilizes output within microseconds after load steps-critical for burst-mode processors and wireless transceivers. |
| Pb-free MLF package | 3mm × 3mm footprint with thermal pad meets RoHS and JEDEC MSL3 standards-suitable for automated reflow assembly. |
| Micropower shutdown | EN pin reduces total current draw to <5µA-enables long-term storage without battery drain in IoT endpoint devices. |
Applications
| Cellular Phone Power Management | USB Peripheral Regulation |
|---|---|
Use Scenario: Regulating main SoC core voltage during active transmission and switching to ultra-low-noise mode during idle/sleep cycles. IC Role / Device Role / Timing Role: Primary DC-DC converter with dynamic mode selection-PWM supplies CPU/GPU; LDO powers RTC and baseband clock circuitry. Use Value: Extends talk time by >15% versus fixed-PWM regulators and eliminates audible noise in earpiece amplifiers during standby. |
Use Scenario: Providing stable 3.3V or 5V rail to USB-HID devices (keyboards, mice) powered from bus or local battery. IC Role / Device Role / Timing Role: Standalone step-down regulator with LDO fallback-ensures clean power during USB suspend/resume transitions. Use Value: Meets USB 2.0 suspend current limits (<500µA) while maintaining regulation-avoids host enumeration failures. |
| PDA System-on-Module Supply | Portable Medical Sensor Node |
Use Scenario: Delivering adjustable 1.2V–3.3V to memory, display controller, and touch interface in handheld PDAs. IC Role / Device Role / Timing Role: Dual-output-capable single-chip solution-uses FB divider for VDDIO and LDO pin for always-on sensor bias. Use Value: Reduces board area by 40% vs. discrete buck + LDO combo; enables 1.5mm² inductor footprint. |
Use Scenario: Powering low-power ECG/SpO₂ analog front-end and BLE radio in wearable health monitors. IC Role / Device Role / Timing Role: Primary power IC-PWM mode drives radio during transmit; LDO mode powers precision ADC during sampling. Use Value: 75µVrms LDO noise prevents baseline wander in 24-bit medical ADCs; 20µA IQ extends 2-week battery life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-mode buck-LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRVR | 3MHz fixed-frequency buck only; no integrated LDO-requires external linear regulator for low-noise mode. | Lacks seamless mode handoff; higher system-level quiescent current (>35µA) due to separate LDO bias. | Choose when cost sensitivity outweighs noise performance and board space constraints are relaxed. |
| MAX8640YETA+ | 2.25MHz buck with integrated LDO, but LDO IQ = 45µA and output noise = 120µVrms-higher than MIC2245YML-TR. | Less suitable for precision analog sensors due to elevated noise floor and slower transient response. | Prefer for non-critical digital loads where 45µA standby is acceptable and 120µVrms noise does not impact function. |
Compared with TPS62231DRVR and MAX8640YETA+, the MIC2245YML-TR delivers superior low-noise performance (75µVrms), lower standby IQ (20µA), and true integrated dual-mode architecture-making it optimal for space-constrained, battery-sensitive applications demanding clean analog power without added components.
Availability
MIC2245YML-TR is available at Aetrix Electronics and suitable for cellular phones, USB peripherals, PDAs, portable medical sensors, and other portable electronics requiring stable component supply with guaranteed long-term lifecycle support.
Supply support for MIC2245YML-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 and power management ICs before its acquisition by Microchip Technology in 2015.
The MIC2245YML-TR belongs to Micrel's LOWQ™ family of dual-mode regulators, designed specifically for portable battery-powered systems needing both high-efficiency switching and ultra-low-noise linear regulation in a single compact package.
FAQ
What is the primary function of the LOWQ pin on the MIC2245YML-TR?
The LOWQ pin on the MIC2245YML-TR controls mode selection: pulling it low (<0.5V) activates the integrated LDO for ultra-low-noise, low-quiescent-current operation (20µA), while pulling it high (>1.5V) enables the 4MHz synchronous buck regulator for high-current delivery (500mA). This pin enables dynamic power-state adaptation without external circuitry-central to the MIC2245YML-TR's dual-mode architecture.
Can the MIC2245YML-TR operate with an input voltage below 2.7V?
No-the MIC2245YML-TR has a specified minimum input voltage of 2.7V per its Absolute Maximum Ratings and Operating Ratings. Below this threshold, under-voltage lockout (UVLO) engages at 2.45V (typical turn-on), disabling regulation. Attempting operation below 2.7V risks failure to start or unstable output, and is outside the validated design envelope for the MIC2245YML-TR.
What is the maximum output voltage achievable with the MIC2245YML-TR in adjustable configuration?
In adjustable configuration, the MIC2245YML-TR supports output voltages up to 5.5V using the FB pin and external resistor divider, constrained by its 5.5V maximum input rating and internal 1.0V reference. The datasheet confirms operation with VOUT = VIN − dropout, and typical application circuits demonstrate 3.3V and 5.0V outputs-fully supported within the MIC2245YML-TR's validated electrical characteristics.
How does the MIC2245YML-TR handle thermal overload?
The MIC2245YML-TR incorporates thermal shutdown protection that triggers at 160°C junction temperature, halting switching and LDO operation until temperature falls by 20°C hysteresis. This safeguard prevents permanent damage during sustained overload or poor PCB thermal design-ensuring robust field reliability for the MIC2245YML-TR in enclosed portable enclosures.
Is the MIC2245YML-TR compatible with ceramic output capacitors smaller than 4.7µF?
No-the MIC2245YML-TR's internal type III compensation is optimized for a 4.7µF output capacitor; using smaller values (e.g., 2.2µF or 1µF) risks instability and oscillation due to insufficient phase margin. The datasheet explicitly recommends 4.7µF X5R/X7R ceramics and warns against larger values that may also cause instability-so 4.7µF is the validated minimum for the MIC2245YML-TR.
MIC2245YML-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 10-VFDFN Exposed Pad, 10-MLF®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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):
- 1V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 500mA
- Frequency - Switching:
- 4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MLF® (3x3)
MIC2245YML-TR FAQ
1.How can I place an order for MIC2245YML-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2245YML-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 MIC2245YML-TR reliable?
The price and inventory of MIC2245YML-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2245YML-TR is usually 5 days.
3.What payment methods are accepted for MIC2245YML-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2245YML-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2245YML-TR?
MIC2245YML-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2245YML-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 MIC2245YML-TR?
For technical support, including MIC2245YML-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2245YML-TR requirements.
6.How does Aetrix verify that MIC2245YML-TR is sourced from the original manufacturer or authorized distributors?
All MIC2245YML-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 MIC2245YML-TR meets industry standards.
7.What is the process for return or replacement of MIC2245YML-TR?
All MIC2245YML-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC2245YML-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 MIC2245YML-TR part is unused and in its original packaging.
Return procedure for MIC2245YML-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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