My Inquiry
My Account
Microchip Technology MIC2238-S4YML-TR
- Part No.:
- MIC2238-S4YML-TR
- Manufacturer:
- Microchip Technology
- Package:
- 12-VFDFN Exposed Pad, 12-MLF®
- Datasheet:
-
MIC2238-S4YML-TR.pdf
- Description:
- IC REG BUCK 1.2V/3.3V DL 12MLF
- Quantity:
- Payment:
- Shipping:
Inventory:4,796
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MIC2238-S4YML-TR from Micrel is a dual-output, 2-phase synchronous buck DC/DC regulator delivering 3.3V and 1.2V outputs from a 2.5V–5.5V input. It operates at 2.5MHz PWM frequency, supports 800mA per channel, achieves >95% efficiency, and features ultra-low 28µA quiescent current for battery-powered portable electronics including digital cameras and MP3 players.
For engineers reviewing the MIC2238-S4YML-TR datasheet, MIC2238-S4YML-TR pinout, MIC2238-S4YML-TR application, or MIC2238-S4YML-TR equivalent, key selection criteria include fixed dual-voltage output configuration, MLF®-12L package compatibility, /FPWM-controlled low-noise mode, PGOOD sequencing capability, and 100% duty-cycle operation in dropout conditions.
Technical Context
The MIC2238-S4YML-TR integrates two independent synchronous buck regulators operating 180° out of phase to reduce input ripple and improve transient response. Each channel uses internal N- and P-channel MOSFETs with 0.4Ω high-side and 0.35Ω low-side RDS(ON), enabling efficient conversion without external power switches.
It employs current-mode control with internal compensation, stable with 2.2µH inductors and 2.2µF ceramic output capacitors. The /FPWM pin selects between automatic Trickle (PFM) mode below ~100mA and forced constant-frequency PWM mode-critical for noise-sensitive RF or audio subsystems requiring consistent switching spectra.
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 Voltages | 3.3V and 1.2V - fixed, factory-trimmed outputs eliminate external feedback resistors and save PCB area. |
| Switching Frequency | 2.5MHz (typ) - enables use of miniature 1µH–4.7µH inductors and compact 2.2µF ceramic capacitors. |
| Output Current | 800mA per channel - sufficient for powering core logic, I/O rails, or memory subsystems in handheld devices. |
| Quiescent Current | 28µA in Trickle mode - extends battery standby time in always-on applications like camera wake-on-motion. |
| Duty Cycle Max | 100% - maintains regulation during deep input voltage droop (e.g., battery sag under load). |
| PGOOD Accuracy | ±6.25%/−8.5% window - provides reliable power sequencing signal for FPGA or processor reset management. |
Pinout & Package
The MIC2238-S4YML-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/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT1 (Pin 12) | Fixed 3.3V Output | Primary regulated output rail; connects directly to load without external feedback network. |
| OUT2 (Pin 1) | Fixed 1.2V Output | Secondary regulated output; electrically isolated from OUT1, suitable for core voltage domains. |
| EN1 (Pin 11) | Regulator 1 Enable | Active-high logic control; enables/disables 3.3V output independently for power domain gating. |
| EN2 (Pin 2) | Regulator 2 Enable | Active-high logic control; enables/disables 1.2V output independently for dynamic core voltage scaling. |
| /FPWM (Pin 7) | Forced PWM Mode Bar | Ground to force continuous 2.5MHz PWM; pull high to enable auto-switching between PWM and low-noise Trickle mode. |
| PGOOD (Pin 10) | Power Good Indicator | Open-drain output with 5µA internal pull-up; used for system-level power sequencing and fault detection. |
| VIN (Pin 9) | Main Power Input | Supplies internal switches and drivers; requires local 10µF bypass capacitor to PGND. |
| AVIN (Pin 3) | Analog Supply Input | Bias supply for control circuitry; must be tied to VIN but decoupled separately with 1µF capacitor. |
| SW1 (Pin 8) | Switch Node 1 | Connects to 3.3V output inductor; high dv/dt node requiring short, low-inductance routing. |
| SW2 (Pin 4) | Switch Node 2 | Connects to 1.2V output inductor; routed 180° out-of-phase with SW1 to minimize input ripple. |
| AGND (Pin 5) | Analog Ground | Reference for feedback and error amplifier; must be separated from PGND to avoid noise coupling. |
| PGND (Pin 6) | Power Ground | High-current return path for switch nodes; connected to EP for thermal and EMI performance. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 2-phase synchronous buck topology | Reduces input RMS current by ~30% vs. single-phase, lowering EMI and input capacitor stress. |
| 28µA light-load quiescent current | Extends battery life in standby modes without sacrificing fast wake-up response. |
| Internal soft-start (typ. 1ms) | Prevents inrush current and output overshoot during power-up, eliminating need for external timing components. |
| 1µA shutdown current | Enables true zero-power state when both EN1 and EN2 are deasserted. |
| Current limit protection (1.2A peak) | Protects internal MOSFETs and external inductors during short-circuit or overload events. |
| Thermal shutdown with 20°C hysteresis | Ensures safe recovery after overtemperature events without oscillation or latch-up. |
Applications
| Digital Camera Power Management | MP3 Player Core/IO Rail Generation |
|---|---|
Use Scenario: Dual-rail power for CMOS image sensor (1.2V core) and interface logic (3.3V I/O) in compact digital cameras. IC Role / Device Role / Timing Role: Primary dual-output DC/DC regulator providing tightly regulated, low-noise supplies with independent enable control. Use Value: Eliminates need for two discrete converters; 2.5MHz operation allows tiny 2.2µH inductors and 2.2µF caps, reducing total solution size by >40% vs. lower-frequency alternatives. |
Use Scenario: Simultaneous generation of 3.3V audio codec supply and 1.2V DSP core voltage in portable music players. IC Role / Device Role / Timing Role: Synchronous buck regulator with out-of-phase switching to minimize input ripple into shared battery source. Use Value: 95%+ efficiency across 10mA–800mA load range extends playback time; /FPWM pin enables all-PWM mode during audio playback to suppress audible beat frequencies. |
| Smartphone Baseband Subsystem | PDA Application Processor Power |
Use Scenario: Powering baseband processor core (1.2V) and transceiver I/O (3.3V) in legacy 2G/3G handsets. IC Role / Device Role / Timing Role: Fixed-output dual buck regulator with PGOOD sequencing for controlled power-up of RF and digital blocks. Use Value: Integrated PGOOD with programmable delay (via external cap) ensures proper voltage ramp order, preventing latch-up in multi-rail SoCs. |
Use Scenario: Supplying 1.2V core and 3.3V peripheral voltage for ARM-based PDA processors with dynamic voltage scaling. IC Role / Device Role / Timing Role: Dual-phase regulator supporting independent EN1/EN2 control for fine-grained power domain management. Use Value: 100% duty cycle capability maintains 1.2V core rail during battery voltage sag below 3.3V, avoiding premature brownout resets. |
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 |
|---|---|---|---|
| TPS65131RGER | Single 3.3V output + adjustable second output (0.6–3.3V); 1.5MHz switching; no /FPWM pin. | Requires external resistor divider for second rail; lacks dedicated low-noise PWM forcing capability. | Choose if adjustable second output is needed and 2.5MHz switching is not required. |
| RT8059ZSP | Dual fixed outputs (3.3V/1.2V); 1.5MHz switching; 65µA quiescent current; no PGOOD or /FPWM. | Higher IQ reduces battery standby time; missing PGOOD limits sequencing flexibility in complex systems. | Choose only for cost-sensitive, non-sequencing applications where 2.5MHz and ultra-low IQ are not critical. |
Compared with TPS65131RGER and RT8059ZSP, the MIC2238-S4YML-TR uniquely delivers fixed dual outputs with 2.5MHz operation, 28µA IQ, /FPWM control, and integrated PGOOD-making it optimal for space-constrained, battery-sensitive portable designs requiring precise power sequencing and low-noise operation.
Availability
MIC2238-S4YML-TR is available at Aetrix Electronics and suitable for digital camera power management, MP3 player core/IO rail generation, smartphone baseband subsystems, PDA application processor power, and portable medical monitoring devices requiring stable component supply and long-term lifecycle support.
Supply support for MIC2238-S4YML-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 analog and mixed-signal semiconductor company specializing in power management, timing, and interface ICs before its acquisition by Microchip Technology in 2015.
The MIC2238 product line was designed specifically for high-efficiency, space-constrained dual-rail power in portable consumer electronics-emphasizing ultra-low quiescent current, fixed-output simplicity, and 2.5MHz switching for minimal passive component footprint.
FAQ
What is the output voltage configuration of the MIC2238-S4YML-TR?
The MIC2238-S4YML-TR is a factory-configured fixed-output variant delivering precisely 3.3V on OUT1 (Pin 12) and 1.2V on OUT2 (Pin 1). These voltages are trimmed during production and require no external feedback resistors-reducing bill-of-materials count and PCB layout complexity compared to adjustable versions like MIC2238-AAYML.
Does the MIC2238-S4YML-TR support power sequencing between its two outputs?
No-the MIC2238-S4YML-TR does not provide independent sequencing control between OUT1 and OUT2. However, its PGOOD pin (Pin 10) monitors only the 3.3V output (OUT1) and can be used with external logic to gate EN2, enabling system-level sequencing. The device itself powers both regulators simultaneously when EN1 and EN2 are asserted.
Can the MIC2238-S4YML-TR operate with a 2.5V input and still regulate 3.3V output?
No-the MIC2238-S4YML-TR cannot boost voltage; it is a buck-only regulator. With a 2.5V input, the 3.3V output cannot be sustained. The minimum input voltage for 3.3V regulation is approximately 3.5V (accounting for dropout), and the device requires ≥2.5V input only when regulating the 1.2V output or operating in 100% duty cycle mode near dropout.
What is the purpose of the /FPWM pin on the MIC2238-S4YML-TR?
The /FPWM pin (Pin 7) on the MIC2238-S4YML-TR controls the light-load operating mode: grounding it forces continuous 2.5MHz PWM operation for lowest output voltage ripple and predictable EMI spectrum; pulling it high enables automatic switching between PWM and low-noise Trickle (PFM) mode based on load current-optimizing efficiency below ~100mA.
Is the MIC2238-S4YML-TR RoHS compliant and lead-free?
Yes-the MIC2238-S4YML-TR uses Micrel's Pb-free 3mm × 3mm MLF®-12L package with NiPdAu lead finish and halogen-free mold compound, fully compliant with RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 3 (MSL3).
MIC2238-S4YML-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):
- 1.2V, 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-S4YML-TR FAQ
1.How can I place an order for MIC2238-S4YML-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2238-S4YML-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-S4YML-TR reliable?
The price and inventory of MIC2238-S4YML-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-S4YML-TR is usually 5 days.
3.What payment methods are accepted for MIC2238-S4YML-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2238-S4YML-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2238-S4YML-TR?
MIC2238-S4YML-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2238-S4YML-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-S4YML-TR?
For technical support, including MIC2238-S4YML-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2238-S4YML-TR requirements.
6.How does Aetrix verify that MIC2238-S4YML-TR is sourced from the original manufacturer or authorized distributors?
All MIC2238-S4YML-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-S4YML-TR meets industry standards.
7.What is the process for return or replacement of MIC2238-S4YML-TR?
All MIC2238-S4YML-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC2238-S4YML-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-S4YML-TR part is unused and in its original packaging.
Return procedure for MIC2238-S4YML-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MIC2238-S4YML-TR Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
