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Microchip Technology MIC2285AYMT-TR
- Part No.:
- MIC2285AYMT-TR
- Manufacturer:
- Microchip Technology
- Package:
- 10-UFDFN, 10-TMLF®
- Datasheet:
-
MIC2285AYMT-TR.pdf
- Description:
- IC REG BUCK ADJ 600MA 10TMLF
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MIC2285AYMT-TR from Micrel is an 8MHz PWM synchronous buck regulator with integrated LOWQ® LDO standby mode, operating from 2.7V to 5.5V input and delivering up to 600mA output current in PWM mode or 60mA in LDO mode while drawing only 20µA quiescent current. It features 100% duty cycle capability, ultra-fast transient response, and a 0.47µH inductor requirement-enabling compact, low-noise power solutions for portable USB peripherals and cellular handsets.
For engineers reviewing the MIC2285AYMT-TR datasheet, MIC2285AYMT-TR pinout, MIC2285AYMT-TR application, or MIC2285AYMT-TR equivalent, key selection considerations include its dual-mode operation (PWM/LDO), 75µVrms output noise in LDO mode, 10-pin 2mm × 2mm Thin MLF® package, –40°C to +125°C junction temperature range, and compatibility with adjustable (1V–5.5V) or fixed-output configurations.
Technical Context
The MIC2285AYMT-TR implements a constant-frequency 8MHz PWM control architecture with internal high-side P-channel and low-side N-channel MOSFETs, enabling >90% efficiency at 600mA load. Its LOWQ® mode disables PWM switching and activates an integrated linear regulator, reducing quiescent current to 20µA while maintaining regulated output with 75µVrms noise.
It supports seamless transition between modes via the LOWQ pin: logic low (<0.5V) enables LDO mode (60mA max, 110mV dropout at 50mA), logic high (>1.5V) enables PWM mode (600mA max, 100% duty cycle). Feedback is referenced to a precise 1.0V internal bandgap (±1% typical), and the device includes thermal shutdown, current limiting, and micropower shutdown (<5µA).
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 regulation. |
| PWM Switching Frequency | 8MHz (7.2–8.8MHz typ.) - enables use of sub-1µH inductors and reduces output capacitor size. |
| Max Output Current (PWM) | 600mA - sufficient for core logic, RF transceivers, or display drivers in portable systems. |
| Quiescent Current (LDO Mode) | 20µA - extends battery life during system sleep/standby without introducing switching noise. |
| Output Noise (LDO Mode) | 75µVrms (10Hz–100kHz) - meets low-noise analog supply requirements for ADCs, sensors, or RF ICs. |
| Duty Cycle Capability | 100% - allows operation with VIN as low as VOUT + dropout (e.g., 3.3V out from 3.41V input). |
| Feedback Reference Voltage | 1.0V ±1% - enables precise adjustable output down to 1V using standard resistor ratios. |
| Junction Temperature Range | –40°C to +125°C - qualified for automotive infotainment, industrial handhelds, and extended-temperature environments. |
Pinout & Package
The MIC2285AYMT-TR is housed in a 10-pin 2mm × 2mm × 0.55mm Thin MLF® (MicroLeadFrame) package with exposed thermal pad (MT suffix), optimized for high-density portable PCB layouts and thermal performance (θJA = 60°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 AGND | Analog ground reference | Separate low-noise return path for feedback, bias, and control circuitry-must be isolated from PGND loop. |
| 2 LDO | LDO output terminal | Connects directly to VOUT in LOWQ mode; high-impedance in PWM mode-enables seamless mode handoff. |
| 3 BIAS | Internal bias supply node | Requires 0.1µF decoupling to AGND; powers reference and error amplifier-sensitive to noise coupling. |
| 4 AVIN | Analog supply input | Must tie to VIN but routed separately to minimize switching noise injection into control circuitry. |
| 5 FB | Feedback input | Senses output voltage via resistor divider; 1V reference enables 1V–5.5V adjustable outputs with <±1% accuracy. |
| 6 EN | Enable control input | Logic low (<0.5V) shuts down entire device (<5µA IQ); open-drain compatible with microcontroller GPIO. |
| 7 LOWQ | Mode select input | Logic low enables LDO mode (20µA IQ, 60mA IOUT); logic high enables PWM mode (600mA IOUT). |
| 8 VIN | Main power input | Supplies internal MOSFETs and drivers; requires local 1µF X5R/X7R ceramic bypass to PGND. |
| 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 PWM switching loop-requires dedicated low-inductance copper pour separate from AGND. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode regulation (PWM + LDO) | Enables >90% efficiency at full load and 20µA quiescent current at light load-eliminates need for separate LDO in battery-powered systems. |
| Ultra-low-noise LDO output | 75µVrms noise ensures clean supply for noise-sensitive circuits (e.g., RF front-ends, precision ADCs) without EMI filters. |
| Integrated MOSFETs with 100% duty cycle | Supports low-VIN applications (e.g., 3.3V rail from aging Li-ion cell) without dropout-induced brownout. |
| Minimal external components | Operates with only one 0.47µH inductor, one 10µF output cap, and two feedback resistors-reduces BOM count and board area. |
| Robust protection suite | Includes thermal shutdown (160°C), overcurrent limiting (0.75–1.85A), and UVLO (2.45–2.65V) - prevents damage under fault conditions. |
| Thin MLF® package (2×2×0.55mm) | Enables sub-0.55mm profile solutions ideal for slim smartphones, wearables, and compact USB devices. |
Applications
| Cellular Phones | USB Peripherals |
|---|---|
Use Scenario: Powering baseband processor core voltage during active call and transitioning to deep-sleep mode between data bursts. IC Role / Device Role / Timing Role: Primary DC-DC converter providing dynamically scaled VCORE with seamless PWM-to-LDO handoff on LOWQ assertion. Use Value: Extends talk time by 12–18% versus burst-mode regulators due to absence of low-frequency ripple-induced inefficiency. | Use Scenario: Regulating 3.3V supply for USB 2.0 hub controller and attached flash drives in portable docking stations. IC Role / Device Role / Timing Role: Main power stage delivering stable 3.3V with <75µVrms noise to meet USB compliance jitter and signal integrity requirements. Use Value: Eliminates need for post-regulation LC filtering-reducing solution size by 35% and cost by $0.18 per unit. |
| PDA Systems | Portable Medical Sensors |
Use Scenario: Supplying 1.8V to ARM9 application processor and 2.5V to LCD driver in handheld diagnostic tools. IC Role / Device Role / Timing Role: Dual-output-capable buck regulator (via resistor network) supporting multiple rail requirements from single input. Use Value: Achieves <1.5% total output variation across –40°C to +85°C, meeting medical-grade stability requirements. | Use Scenario: Powering low-noise analog front-end (AFE) and Bluetooth LE radio in wearable ECG monitors. IC Role / Device Role / Timing Role: Single-chip solution providing quiet 3.0V LDO-mode supply to AFE during patient monitoring and efficient PWM-mode supply to radio during data transmission. Use Value: Reduces electromagnetic interference (EMI) that could corrupt microvolt-level biopotential signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator with LDO standby applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62260DRVR | 3MHz switching frequency, 300mA max output, 22µA LDO quiescent current, no 100% duty cycle support. | Lower output current and fixed 3MHz frequency limit suitability for lower-power IoT nodes-not recommended for 600mA loads. | Select if footprint compatibility with TI's 2mm × 2mm DSG package is required and 300mA output suffices. |
| RT8059ZSP | 6MHz frequency, 600mA output, 25µA LDO IQ, 70µVrms noise, but lacks LOWQ pin-uses automatic pulse-skipping instead of true LDO mode. | Introduces ~200kHz burst noise during light load-unsuitable for noise-critical analog supplies. | Choose only when lowest BOM cost is prioritized over ultra-low-noise performance. |
Compared with TPS62260DRVR and RT8059ZSP, the MIC2285AYMT-TR uniquely combines 8MHz operation, 600mA PWM current, true LDO standby (not pulse-skipping), and 100% duty cycle-making it optimal for space-constrained, battery-sensitive designs requiring both high efficiency and ultra-low noise.
Availability
MIC2285AYMT-TR is available at Aetrix Electronics and suitable for cellular phones, USB peripherals, PDAs, and portable medical sensors requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MIC2285AYMT-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 management, and timing solutions before its acquisition by Microchip Technology in 2015.
The MIC2285A product line was designed specifically for portable battery-powered systems needing dynamic power-state optimization-delivering high efficiency in active mode and ultra-low quiescent current in standby without compromising noise performance.
FAQ
What is the maximum output current capability of the MIC2285AYMT-TR in PWM mode?
The MIC2285AYMT-TR delivers up to 600mA of continuous output current in PWM mode, supported by internal MOSFETs with 0.4Ω high-side and low-side ON-resistance. This rating holds across the full –40°C to +125°C junction temperature range and input voltage range of 2.7V to 5.5V, as verified in the August 2007 datasheet Figure 5 and Electrical Characteristics table.
How does the LOWQ pin control mode switching in the MIC2285AYMT-TR?
The LOWQ pin on the MIC2285AYMT-TR is a digital control input: applying logic low (<0.5V) disables PWM switching and activates the integrated LDO, reducing quiescent current to 20µA; applying logic high (>1.5V) enables constant-frequency 8MHz PWM operation. The transition between modes is seamless, with no output voltage glitch, as confirmed in the Functional Description and Applications Information sections of the datasheet.
Can the MIC2285AYMT-TR be used with an adjustable output voltage, and what is the minimum achievable value?
Yes, the MIC2285AYMT-TR supports adjustable output voltage down to 1.0V using an external resistor divider on the FB pin, referenced to a precise 1.0V internal bandgap (±1% typical). The minimum output is constrained by the 1.0V feedback threshold and resistor tolerance-achievable with standard 1% resistors and validated in the Typical Application schematic on page 2 of the datasheet.
What package type and dimensions does the MIC2285AYMT-TR use, and is it RoHS compliant?
The MIC2285AYMT-TR uses a 10-pin 2mm × 2mm × 0.55mm Thin MLF® (MicroLeadFrame) package with NiPdAu lead finish and halogen-free mold compound. It is GREEN RoHS compliant, as explicitly stated in the Ordering Information and Package Information sections of the datasheet, and carries the "-TR" tape-and-reel suffix indicating standard reel packaging.
Does the MIC2285AYMT-TR include built-in protection features, and which ones are implemented?
Yes, the MIC2285AYMT-TR integrates thermal shutdown (160°C trip, 20°C hysteresis), overcurrent limiting (0.75–1.85A peak switch current), and input under-voltage lockout (2.45–2.65V turn-on threshold with 100mV hysteresis). These protections are fully specified in the Absolute Maximum Ratings and Electrical Characteristics tables and operate independently of external components.
MIC2285AYMT-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 10-UFDFN, 10-TMLF®
- 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:
- 600mA
- Frequency - Switching:
- 8MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-TMLF® (2x2)
MIC2285AYMT-TR FAQ
1.How can I place an order for MIC2285AYMT-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2285AYMT-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 MIC2285AYMT-TR reliable?
The price and inventory of MIC2285AYMT-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2285AYMT-TR is usually 5 days.
3.What payment methods are accepted for MIC2285AYMT-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2285AYMT-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2285AYMT-TR?
MIC2285AYMT-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2285AYMT-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 MIC2285AYMT-TR?
For technical support, including MIC2285AYMT-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2285AYMT-TR requirements.
6.How does Aetrix verify that MIC2285AYMT-TR is sourced from the original manufacturer or authorized distributors?
All MIC2285AYMT-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 MIC2285AYMT-TR meets industry standards.
7.What is the process for return or replacement of MIC2285AYMT-TR?
All MIC2285AYMT-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC2285AYMT-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 MIC2285AYMT-TR part is unused and in its original packaging.
Return procedure for MIC2285AYMT-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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