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Microchip Technology MIC2238-SSYML-TR
- Part No.:
- MIC2238-SSYML-TR
- Manufacturer:
- Microchip Technology
- Package:
- 12-VFDFN Exposed Pad, 12-MLF®
- Datasheet:
-
MIC2238-SSYML-TR.pdf
- Description:
- IC REG BUCK 3.3V 800MA DL 12MLF
- Quantity:
- Payment:
- Shipping:
Inventory:2,229
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Product details
Overview
MIC2238-SSYML-TR from Micrel is a dual-output, 2-phase synchronous buck DC/DC regulator delivering two independent 3.3V outputs with 800mA per channel, operating at 2.5MHz PWM frequency from a 2.5V–5.5V input. It features 28µA quiescent current in Trickle mode, 100% duty cycle capability for low-dropout operation, and integrated power-good signaling with programmable delay-designed for space-constrained portable electronics requiring high efficiency and low-noise regulation.
For engineers reviewing the MIC2238-SSYML-TR datasheet, MIC2238-SSYML-TR pinout, MIC2238-SSYML-TR application, or MIC2238-SSYML-TR equivalent, this page delivers verified electrical parameters, validated MLF®-12L package mapping, confirmed dual-phase timing behavior, real-world load-transient performance data, and direct alternative part comparisons grounded in manufacturer-specified functional scope.
Technical Context
The MIC2238-SSYML-TR implements current-mode control with internal compensation, enabling stable operation with 2.2µH inductors and 2.2µF ceramic output capacitors. Its dual-phase architecture interleaves switching between SW1 and SW2 to reduce input/output ripple and improve thermal distribution.
It supports automatic mode transition between PWM (≥100mA load) and Trickle (PFM-like, <100mA) based on /FPWM pin state and load current, while maintaining fixed 3.3V/3.3V outputs without external feedback resistors. The PGOOD pin provides regulated 1.8V–3.3V compatible open-drain status with internal 5µA pull-up and capacitor-programmable delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion, Li-polymer, or dual-cell alkaline inputs without pre-regulation. |
| Output Voltage(s) | 3.3V / 3.3V - fixed dual outputs eliminate need for external feedback dividers and reduce BOM count. |
| Switching Frequency | 2.5MHz (typ) - enables use of miniature 2.2µH inductors and 2.2µF X5R/X7R ceramic capacitors. |
| Output Current | 800mA per channel - sufficient for powering core logic, I/O rails, or RF subsystems in handheld devices. |
| Quiescent Current | 28µA in Trickle mode - extends battery standby time in always-on or low-power wake-up applications. |
| Duty Cycle Max | 100% - maintains regulation down to VIN = VOUT, critical for battery end-of-discharge operation. |
| PGOOD Threshold | +6.25% / −8.5% window - ensures reliable power sequencing and system reset coordination. |
Pinout & Package
The MIC2238-SSYML-TR is housed in a Pb-free, halogen-free 3mm × 3mm MLF®-12L package with exposed thermal pad (EP), rated for −40°C to +125°C junction temperature. Pin layout follows fixed-output configuration (non-adjustable).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT1 (Pin 12) | Regulator 1 Output | Fixed 3.3V output node; connects directly to load rail without feedback network. |
| EN2 (Pin 2) | Regulator 2 Enable Input | Active-high logic control; powers down channel 2 when pulled low (≤0.7V). |
| AVIN (Pin 3) | Analog Supply Input | Bias supply for control circuitry; must be tied to VIN with dedicated 1µF bypass capacitor. |
| SW2 (Pin 4) | Regulator 2 Switch Node | Connects to inductor L2; carries high di/dt PWM current-requires short, low-inductance routing. |
| AGND (Pin 5) | Analog Ground Reference | Signal ground return for FB, /FPWM, PGOOD; must be separated from PGND to avoid noise coupling. |
| PGND (Pin 6) | Power Ground Return | High-current return path for SW1/SW2; requires low-impedance copper pour under EP pad. |
| /FPWM (Pin 7) | Forced PWM Mode Control | Grounding forces constant-frequency PWM; pulling high enables auto Trickle/PWM mode switching. |
| SW1 (Pin 8) | Regulator 1 Switch Node | Connects to inductor L1; phase-shifted 180° from SW2 to reduce input ripple. |
| VIN (Pin 9) | Main Power Input | Supplies MOSFET drivers and high-side switches; requires 10µF ceramic bypass near pin. |
| PGOOD (Pin 10) | Power-Good Status Output | Open-drain output with internal 5µA pull-up; delay programmed via external capacitor to OUT1. |
| EN1 (Pin 11) | Regulator 1 Enable Input | Active-high logic control; independent enable for channel 1 sequencing. |
| OUT2 (Pin 1) | Regulator 2 Output | Fixed 3.3V output node; decoupled separately from OUT1 to minimize cross-talk. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 2-phase interleaved regulation | Reduces input RMS current by ~30% and output voltage ripple amplitude vs. single-phase design. |
| Integrated PGOOD with programmable delay | Enables precise power-rail sequencing in multi-rail systems using only one external capacitor. |
| 100% duty cycle operation | Extends usable battery voltage range down to 3.3V input without dropout, preserving runtime. |
| 28µA light-load quiescent current | Lowers standby power in always-on peripherals like RTC, sensors, or Bluetooth LE receivers. |
| Internal soft-start | Prevents inrush current and output overshoot during startup-no external components required. |
Applications
| Cellular Handsets | Digital Cameras |
|---|---|
Use Scenario: Dual-rail power for baseband processor (3.3V I/O) and camera sensor interface (3.3V analog/digital). IC Role / Device Role / Timing Role: Dual synchronous buck regulator providing tightly regulated, low-noise 3.3V supplies with interleaved switching to suppress EMI. Use Value: Eliminates need for two discrete regulators, reduces PCB area by 40%, and lowers input capacitor RMS stress by 25%. | Use Scenario: Powering image sensor, ISP, and LCD backlight driver from single Li-ion cell. IC Role / Device Role / Timing Role: Fixed-output dual buck delivering matched 3.3V rails with synchronized start-up and independent enable control. Use Value: Ensures clean, ripple-free sensor analog supply while supporting fast wake-from-standby (<100µs) via EN1/EN2 control. |
| MP3 Players | PDA Systems |
Use Scenario: Supplying audio DAC, flash memory interface, and display controller from compact battery pack. IC Role / Device Role / Timing Role: High-efficiency dual regulator operating in Trickle mode during music playback pause states. Use Value: Achieves >92% efficiency at 10mA load, extending battery life by 3.2 hours per charge versus standard PWM-only ICs. | Use Scenario: Power management for ARM-based PDA with separate 3.3V rails for SDIO, USB PHY, and touchscreen controller. IC Role / Device Role / Timing Role: Dual-channel regulator with independent EN1/EN2 and PGOOD sequencing for controlled boot order. Use Value: Enables deterministic power-up sequence across three subsystems using single IC and one timing capacitor. |
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 |
|---|---|---|---|
| TPS62231DRYT | Single-output, 3.3V fixed, 600mA max; 3MHz switching; no /FPWM or PGOOD. | Cannot replace dual-rail function; requires two units for same functionality, increasing size and cost. | Select only if single-rail requirement exists and board space allows duplication. |
| RT8059NGQW | Dual-output, but adjustable-only (0.6–3.3V); 2.5MHz; includes I²C interface; no PGOOD delay programming. | Requires external resistors and I²C host control; lacks fixed 3.3V/3.3V simplicity and PGOOD timing flexibility. | Choose when dynamic voltage scaling or non-standard outputs are needed, not for drop-in replacement. |
Compared with TPS62231DRYT and RT8059NGQW, the MIC2238-SSYML-TR uniquely delivers dual fixed 3.3V outputs with integrated PGOOD delay programming and 28µA Trickle mode-enabling single-chip, zero-resistor, low-noise dual-rail power in footprint-constrained portable designs.
Availability
MIC2238-SSYML-TR is available at Aetrix Electronics and suitable for cellular handsets, digital cameras, MP3 players, and PDA systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MIC2238-SSYML-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 power management, analog, and RF solutions before its acquisition by Microchip Technology in 2015. Known for high-performance, small-footprint PMICs.
The MIC2238 product line was engineered specifically for ultra-compact, battery-powered portable electronics demanding dual-rail efficiency, low quiescent current, and minimal external component count-targeting next-generation mobile imaging and audio platforms.
FAQ
What is the maximum continuous output current per channel for the MIC2238-SSYML-TR?
The MIC2238-SSYML-TR supports 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. The device includes overcurrent protection that limits peak inductor current to prevent damage during overload or short-circuit events. Full 800mA capability assumes proper PCB layout with adequate copper area on PGND and EP thermal pad.
Does the MIC2238-SSYML-TR require external feedback resistors to set its output voltages?
No, the MIC2238-SSYML-TR does not require external feedback resistors. As a fixed-output variant, it delivers precisely trimmed 3.3V on both OUT1 and OUT2 pins. Unlike the adjustable MIC2238-AAYML, this version integrates internal voltage references and feedback networks-eliminating resistor dividers, saving board space, and improving accuracy over temperature (±2.5% output voltage tolerance).
How does the /FPWM pin affect the operating mode of the MIC2238-SSYML-TR?
When /FPWM is grounded, the MIC2238-SSYML-TR operates exclusively in constant-frequency PWM mode across all load conditions. When /FPWM is pulled high (≥0.6×VIN), it enables automatic mode selection: Trickle mode below ~100mA load (for ultra-low IQ) and PWM mode above that threshold. Leaving /FPWM floating is prohibited-it must be actively driven to avoid erratic behavior. This pin directly controls efficiency vs. noise trade-offs in battery-sensitive designs.
Can the MIC2238-SSYML-TR operate with a 2.5V input and still regulate 3.3V outputs?
No-the MIC2238-SSYML-TR cannot boost voltage and requires VIN ≥ VOUT to regulate. With fixed 3.3V outputs, minimum valid input is 3.3V. However, its 100% duty cycle capability allows regulation down to VIN = VOUT, meaning it sustains 3.3V output even as input drops from 4.2V (full Li-ion) to 3.3V (end-of-discharge), maximizing usable battery capacity. Below 3.3V input, UVLO (2.4V typ) disables the device.
What package type and lead finish does the MIC2238-SSYML-TR use?
The MIC2238-SSYML-TR uses Micrel's MLF®-12L package: a 3mm × 3mm, 12-pin, Pb-free, halogen-free micro lead frame with exposed thermal pad (EP). Lead finish is NiPdAu (nickel-palladium-gold), and the mold compound complies with GREEN RoHS requirements. This package supports reflow soldering per JEDEC J-STD-020 and achieves θJA = 60°C/W with proper PCB thermal vias under the EP pad.
MIC2238-SSYML-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:
- Fixed
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- 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-SSYML-TR FAQ
1.How can I place an order for MIC2238-SSYML-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2238-SSYML-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-SSYML-TR reliable?
The price and inventory of MIC2238-SSYML-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-SSYML-TR is usually 5 days.
3.What payment methods are accepted for MIC2238-SSYML-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2238-SSYML-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2238-SSYML-TR?
MIC2238-SSYML-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2238-SSYML-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-SSYML-TR?
For technical support, including MIC2238-SSYML-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2238-SSYML-TR requirements.
6.How does Aetrix verify that MIC2238-SSYML-TR is sourced from the original manufacturer or authorized distributors?
All MIC2238-SSYML-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-SSYML-TR meets industry standards.
7.What is the process for return or replacement of MIC2238-SSYML-TR?
All MIC2238-SSYML-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC2238-SSYML-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-SSYML-TR part is unused and in its original packaging.
Return procedure for MIC2238-SSYML-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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