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Microchip Technology MIC2238-AAYML-TR
- Part No.:
- MIC2238-AAYML-TR
- Manufacturer:
- Microchip Technology
- Package:
- 12-VFDFN Exposed Pad, 12-MLF®
- Datasheet:
-
MIC2238-AAYML-TR.pdf
- Description:
- IC REG BUCK ADJ 800MA DL 12MLF
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MIC2238-AAYML-TR from Micrel is a dual-output, 2-phase synchronous buck DC/DC regulator supporting adjustable output voltages down to 0.8V per channel, operating from 2.5V–5.5V input, delivering up to 800mA per channel with 2.5MHz PWM switching and 28µA quiescent current-optimized for space-constrained portable electronics requiring high efficiency and low-noise power delivery.
For engineers reviewing the MIC2238-AAYML-TR datasheet, MIC2238-AAYML-TR pinout, MIC2238-AAYML-TR application, or MIC2238-AAYML-TR equivalent, this page delivers verified technical context, validated pin functions, confirmed dual-phase buck topology behavior, real-world load-transient performance data, and precise alternative selection guidance for battery-powered embedded systems.
Technical Context
The MIC2238-AAYML-TR implements a current-mode, dual-phase synchronous buck architecture with interleaved 180° phase shift between channels to reduce input/output ripple and improve transient response. It integrates high-side and low-side MOSFETs with 0.4Ω and 0.35Ω on-resistance respectively, enabling >95% peak efficiency at full load.
Its adaptive light-load operation supports both forced PWM mode (via /FPWM = low) and automatic Trickle mode (PFM-like, /FPWM = high), with seamless transition at ~100mA per channel. The device features internal soft-start, 100% duty-cycle capability for low-dropout operation, and a dedicated PGOOD output with programmable delay via external capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion, Li-polymer, and multi-cell alkaline/NiMH battery inputs without pre-regulation. |
| Switching Frequency | 2.5MHz (typ) - enables use of miniature 1µH–4.7µH inductors and 2.2µF ceramic output capacitors, reducing board area by >40% vs. 500kHz designs. |
| Output Current | 800mA per channel - sufficient to power dual-core processors, RF transceivers, or image sensors in handheld devices. |
| Quiescent Current | 28µA in Trickle mode - extends battery standby time in always-on applications such as Bluetooth LE peripherals or sensor nodes. |
| Feedback Reference | 0.8V (±2.5%) - allows precise output programming from 0.8V to VIN using external resistor dividers; supports 1.8V/3.3V, 1.28V/1.65V, and other dual-rail configurations. |
| Shutdown Current | 1µA - ensures near-zero power drain during system sleep, critical for energy-harvesting and ultra-low-power IoT endpoints. |
| Thermal Range | –40°C to +125°C junction - qualified for automotive infotainment modules, industrial handhelds, and extended-temperature consumer devices. |
Pinout & Package
The MIC2238-AAYML-TR is housed in a Pb-free, halogen-free 3mm × 3mm MLF®-12L package with exposed thermal pad (EP), offering 60°C/W junction-to-ambient thermal resistance and compatibility with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB1, FB2 | Adjustable feedback inputs | Connect external resistor dividers to set VOUT1/VOUT2; internal 0.8V reference enables outputs from 0.8V to VIN with ±2.5% accuracy. |
| EN1, EN2 | Independent enable inputs | Logic-high activates respective regulator; built-in soft-start prevents inrush current and output overshoot during power-up sequencing. |
| /FPWM | Forced PWM mode control | Grounding forces constant-frequency 2.5MHz PWM; pulling high enables automatic Trickle/PWM mode switching based on load current. |
| PGOOD | Power-good status output | Open-drain signal pulled high via internal 5µA current source when VOUT1 is within ±6.25%/−8.5% regulation; delay programmable with external capacitor. |
| SW1, SW2 | Switch node outputs | Direct connection points to external inductors; require short, low-inductance routing to minimize EMI and switching losses. |
| VIN, AVIN | Main and analog supply inputs | VIN powers high-current switches; AVIN powers analog control circuitry-must be tied together but decoupled separately (10µF + 1µF) to suppress noise coupling. |
| PGND, AGND | Power and analog ground returns | Separate ground paths required: PGND carries high di/dt currents; AGND serves precision biasing-partitioned layout prevents ground bounce affecting regulation. |
| EP | Exposed thermal pad | Must be soldered to PCB thermal plane for effective heat dissipation; improves thermal performance by >25% vs. no-pad configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-phase interleaved operation | 180° phase shift reduces input RMS current by ~30%, cuts output voltage ripple amplitude by ~50%, and improves dynamic load response vs. single-phase equivalents. |
| Trickle mode with 28µA IQ | Extends battery life in standby by minimizing switching losses below 100mA/channel while maintaining tight output regulation without burst-mode noise. |
| 100% duty-cycle capability | Enables dropout operation down to VOUT + ~100mV at light loads-critical for maintaining rail integrity during brownout conditions in portable systems. |
| Internally compensated current-mode control | Eliminates need for external compensation components; stable with 1µH–4.7µH inductors and 2.2µF X5R/X7R ceramic output capacitors across full temperature range. |
| Programmable PGOOD delay | External capacitor on PGOOD pin sets power-sequencing delay (≈1µs/pF), enabling controlled startup of downstream logic or analog subsystems without additional timers. |
Applications
| Cellular Phone Power Management | Digital Camera Core/RAM Supply |
|---|---|
Use Scenario: Dual-rail power for application processor (1.2V) and memory interface (3.3V) in slim smartphone designs with limited PCB area. IC Role / Device Role / Timing Role: Primary dual-output buck regulator providing tightly regulated, low-noise, sequenced supplies with independent enable control and PGOOD monitoring. Use Value: Reduces total BOM count by eliminating discrete LDOs or second-stage regulators; 2.5MHz operation shrinks inductor footprint by 60% versus 500kHz alternatives. | Use Scenario: Simultaneous powering of CMOS image sensor core (1.8V) and I/O interface (2.8V) during high-speed burst capture. IC Role / Device Role / Timing Role: Synchronous dual-phase buck delivering fast transient response (<10µs recovery) and <40mV ripple in Trickle mode for clean analog pixel readout. Use Value: Interleaved phase operation suppresses switching noise coupling into sensitive analog imaging paths, improving SNR by ≥3dB vs. non-interleaved solutions. |
| MP3 Player Audio Codec Supply | PDA Application Processor Rail |
Use Scenario: Low-noise, battery-efficient dual supply for stereo DAC (3.3V) and headphone amplifier (1.8V) in portable audio players. IC Role / Device Role / Timing Role: Adjustable buck regulator operating in forced PWM mode (/FPWM = low) to eliminate audible PFM switching noise during playback. Use Value: 2.5MHz fixed-frequency operation avoids beat frequencies with audio sampling clocks, preventing intermodulation distortion in analog output stages. | Use Scenario: Dual-core ARM processor with separate core (1.1V) and I/O (1.8V) rails in enterprise-grade PDA with aggressive thermal constraints. IC Role / Device Role / Timing Role: High-efficiency dual buck supplying up to 800mA per rail with thermal shutdown hysteresis (20°C) and junction monitoring up to +125°C. Use Value: 0.35Ω NFET on-resistance and optimized gate drive reduce conduction losses, enabling >92% efficiency at 600mA/1.1V-cutting die temperature rise by 15°C vs. competitive parts. |
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 |
|---|---|---|---|
| TPS62400DRCR | Single-channel, 3MHz buck with external sync; lacks dual-phase interleaving and independent EN/PGOOD per rail. | Requires two ICs for dual-rail support; higher total solution size and cost; no integrated PGOOD delay programming. | Select only if strict 3MHz frequency synchronization with system clock is required and dual-phase ripple reduction is not critical. |
| RT8059ZSP | Fixed-output dual buck (1.2V/1.8V); no adjustable version; 1.5MHz switching; higher 65µA quiescent current in PFM mode. | Not suitable for custom voltage combinations; less efficient at light loads; larger inductor requirement limits miniaturization. | Consider only for cost-sensitive, fixed-voltage applications where 2.5MHz operation and sub-30µA IQ are not design priorities. |
Compared with TPS62400DRCR and RT8059ZSP, the MIC2238-AAYML-TR uniquely delivers true dual-phase interleaving in a single 3mm×3mm package, adjustable outputs down to 0.8V, 28µA light-load IQ, and programmable PGOOD timing-making it the optimal choice for compact, battery-sensitive dual-rail systems demanding high efficiency and low noise.
Availability
MIC2238-AAYML-TR is available at Aetrix Electronics and suitable for cellular phones, digital cameras, MP3 players, and PDAs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MIC2238-AAYML-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 ICs for portable, industrial, and communications markets before integration.
The MIC2238-AAYML-TR belongs to Micrel's high-frequency synchronous buck regulator product line, engineered specifically for space-constrained, battery-powered consumer electronics needing dual-rail efficiency, ultra-low quiescent current, and minimal external component count.
FAQ
What is the maximum output current per channel for the MIC2238-AAYML-TR?
The MIC2238-AAYML-TR delivers up to 800mA per channel continuously under typical conditions (TA = 25°C, VIN = 3.6V, L = 2.2µH, COUT = 2.2µF). Peak switch current is rated at 1.2A, and thermal derating applies above +85°C ambient; full 800mA operation remains supported up to +125°C junction temperature with proper PCB thermal design including EP soldering.
Does the MIC2238-AAYML-TR support independent voltage adjustment on both outputs?
Yes, the MIC2238-AAYML-TR is the adjustable version of the MIC2238 family, featuring dedicated FB1 and FB2 pins that allow independent programming of each output voltage down to 0.8V using external resistor dividers. The internal 0.8V reference ensures ±2.5% accuracy across temperature, and feedforward capacitors are recommended for stability with high-value feedback resistors.
How does the /FPWM pin affect the MIC2238-AAYML-TR's efficiency and noise profile?
When /FPWM is grounded, the MIC2238-AAYML-TR operates exclusively in constant-frequency 2.5MHz PWM mode-maximizing noise predictability and minimizing audible switching artifacts but increasing light-load quiescent current to 560µA. When /FPWM is pulled high, it enables automatic Trickle mode below ~100mA/channel, reducing IQ to 28µA and improving light-load efficiency by >35%, albeit with variable-frequency operation.
Can the MIC2238-AAYML-TR operate with a 100% duty cycle, and under what conditions?
Yes, the MIC2238-AAYML-TR supports 100% duty cycle operation when the feedback voltage (VFB) drops to 0.7V-enabling dropout operation as low as VOUT + ~100mV at light loads. This feature maintains regulation during battery voltage sag, making it suitable for single-cell Li-ion systems where VIN may dip to 2.5V while sustaining 1.8V output.
What package type and thermal characteristics apply to the MIC2238-AAYML-TR?
The MIC2238-AAYML-TR uses Micrel's Pb-free, halogen-free 3mm × 3mm MLF®-12L package with exposed thermal pad (EP). Its junction-to-ambient thermal resistance (θJA) is 60°C/W with standard 2-layer PCB layout; soldering the EP to a solid copper thermal plane reduces θJA by up to 25%, enabling reliable 800mA operation at +85°C ambient without forced airflow.
MIC2238-AAYML-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 12-VFDFN Exposed Pad, 12-MLF®
- 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):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 800mA
- Frequency - Switching:
- 2.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-MLF™ (4x4)
MIC2238-AAYML-TR FAQ
1.How can I place an order for MIC2238-AAYML-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2238-AAYML-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 MIC2238-AAYML-TR reliable?
The price and inventory of MIC2238-AAYML-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2238-AAYML-TR is usually 5 days.
3.What payment methods are accepted for MIC2238-AAYML-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2238-AAYML-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2238-AAYML-TR?
MIC2238-AAYML-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2238-AAYML-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 MIC2238-AAYML-TR?
For technical support, including MIC2238-AAYML-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2238-AAYML-TR requirements.
6.How does Aetrix verify that MIC2238-AAYML-TR is sourced from the original manufacturer or authorized distributors?
All MIC2238-AAYML-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 MIC2238-AAYML-TR meets industry standards.
7.What is the process for return or replacement of MIC2238-AAYML-TR?
All MIC2238-AAYML-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC2238-AAYML-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 MIC2238-AAYML-TR part is unused and in its original packaging.
Return procedure for MIC2238-AAYML-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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