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Microchip Technology MIC23250-S4YMT-TR
- Part No.:
- MIC23250-S4YMT-TR
- Manufacturer:
- Microchip Technology
- Package:
- 10-UFDFN, 10-TMLF®
- Datasheet:
-
MIC23250-S4YMT-TR.pdf
- Description:
- IC REG BUCK 1.2V/3.3V DL 10TMLF
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MIC23250-S4YMT-TR from Micrel is a dual-channel synchronous buck regulator delivering 400mA per output at fixed 1.2V and 3.3V, operating at 4MHz switching frequency with HyperLight Load™ mode for ultra-fast transient response and high light-load efficiency. It integrates dual PMOS/NMOS power stages, supports 2.7V–5.5V input, achieves 94% peak efficiency, and targets processor core and I/O rail supply in space-constrained portable electronics.
For engineers reviewing the MIC23250-S4YMT-TR datasheet, MIC23250-S4YMT-TR pinout, MIC23250-S4YMT-TR application, or MIC23250-S4YMT-TR equivalent, key selection criteria include dual-output voltage pairing (1.2V/3.3V), 10-pin 2mm × 2mm Thin MLF® package compatibility, HyperLight Load™ operation down to 1mA, and quiescent current of 33µA with both outputs enabled.
Technical Context
The MIC23250-S4YMT-TR implements a proprietary HyperLight Load™ control architecture combining minimum-on/off-time pulse-frequency modulation (PFM) at light loads and fixed-frequency PWM above ~70mA (with 1µH inductor). Its dual independent control loops use internal 0.72V reference and SNS feedback sensing for precise regulation without external resistors.
This device integrates two fully independent synchronous buck channels sharing only AVIN/VIN/PGND/AGND rails. Each channel features dedicated ENx, SWx, and SNSx pins, enabling independent enable/disable, separate inductor placement, and load-specific transient optimization - critical for mixed-voltage SoC power domains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - compatible with single-cell Li-ion (3.0–4.2V), USB 5V, and regulated 3.3V rails without pre-regulation. |
| Output Voltages | Fixed 1.2V and 3.3V - directly powers ARM Cortex-A/M cores and 3.3V I/O peripherals (e.g., SDIO, UART, SPI) without feedback dividers. |
| Max Output Current | 400mA per channel - sufficient for low-power application processors, RF modules, and sensor hubs in handheld devices. |
| Switching Frequency | 4MHz nominal - enables use of 1µH inductors and 4.7µF ceramic capacitors, achieving sub-1mm profile height in PCB stackup. |
| Quiescent Current | 33µA with both outputs enabled - extends battery runtime in always-on monitoring states (e.g., GPS tracking, BLE beaconing). |
| Efficiency @ 1mA | 85% - maintains high conversion efficiency during deep-sleep modes where system current drops below 10mA. |
| Output Ripple | 20mVpp in HyperLight Load™ mode - minimizes noise coupling into sensitive analog/RF sections without additional LC filtering. |
Pinout & Package
Package: 10-pin 2mm × 2mm Thin MLF® (exposed thermal pad), RoHS-compliant, NiPdAu lead finish, halogen-free mold compound.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | SNS1 | Sense input for VOUT1 (1.2V); connects directly to output capacitor to close regulation loop with minimal trace inductance. |
| 2 | EN1 | Enable input for VOUT1; logic-high (>0.8V) activates channel; must be actively driven - not left floating. |
| 3 | AGND | Analog ground reference for error amplifiers and bias circuitry; requires separate low-noise connection to PGND at single point. |
| 4 | SW1 | Switch node for VOUT1; drives external 1µH inductor; high dv/dt node requiring short, isolated routing away from analog traces. |
| 5 | PGND | Power ground return for high-current MOSFET paths; forms low-inductance loop with VIN and SWx pins. |
| 6 | VIN | Main power input (2.7–5.5V); requires ≥2.2µF ceramic bypass capacitor placed adjacent to pin and PGND. |
| 7 | SW2 | Switch node for VOUT2 (3.3V); independent of SW1 - allows separate inductor placement and layout optimization. |
| 8 | AVIN | Analog supply input; tied externally to VIN but decoupled with 0.01µF capacitor to suppress switching noise on control circuitry. |
| 9 | EN2 | Enable input for VOUT2 (3.3V); independent sequencing control enables staggered power-up of core and I/O rails. |
| 10 | SNS2 | Sense input for VOUT2; routed separately from SNS1 to avoid crosstalk between 1.2V and 3.3V feedback paths. |
Key Features
| Feature | Design Value |
|---|---|
| HyperLight Load™ mode | Enables PFM operation below ~70mA load, sustaining >85% efficiency at 1mA while delivering ultra-fast transient recovery (<10µs). |
| Dual independent enable inputs | EN1 and EN2 allow hardware-controlled power sequencing - e.g., enable 1.2V core before 3.3V I/O to meet SoC boot requirements. |
| Ultra-low output ripple | 20mVpp ripple in light-load PFM mode and only 3mVpp in full PWM mode - eliminates need for post-regulation LDOs in noise-sensitive applications. |
| Thermal performance | θJA = 70°C/W in 2mm × 2mm Thin MLF® package - supports 400mA continuous operation at +85°C ambient with minimal copper area. |
| Integrated current limit | 0.41A typical current limit per channel - protects against short-circuit faults without external current-sense resistors or ICs. |
Applications
| Mobile Handsets | Portable Navigation Devices (GPS) |
|---|---|
Use Scenario: Powering application processor core (1.2V) and cellular/GNSS transceiver I/O (3.3V) from single Li-ion cell. IC Role / Device Role / Timing Role: Dual-output DC-DC converter providing tightly regulated, sequenced, low-noise power rails with dynamic load handling. Use Value: Eliminates discrete regulators and reduces BOM count by two; 4MHz operation shrinks passive size, enabling thinner handset profiles. |
Use Scenario: Supplying GPS baseband processor (1.2V) and RF front-end (3.3V) in compact automotive-grade portable navigation units. IC Role / Device Role / Timing Role: High-efficiency dual buck regulator maintaining stable output under rapid GPS signal acquisition current surges. Use Value: HyperLight Load™ sustains >85% efficiency during satellite search (1–10mA), extending battery life without compromising RF sensitivity. |
| WiFi/WiMax Modules | USB-Powered Devices |
Use Scenario: Delivering 1.2V logic and 3.3V radio power to embedded WiFi modules in IoT edge nodes powered by USB or energy harvesting. IC Role / Device Role / Timing Role: Dual-channel synchronous buck supplying clean, low-ripple power with independent enable control for duty-cycled RF operation. Use Value: 33µA quiescent current enables multi-week sleep mode; 4MHz switching avoids interference with 2.4GHz WiFi band harmonics. |
Use Scenario: Regulating USB 5V input to 1.2V (microcontroller core) and 3.3V (USB PHY/interface) in portable diagnostic tools or HID devices. IC Role / Device Role / Timing Role: Compact dual buck converter replacing linear regulators to minimize heat dissipation and maximize runtime from limited USB power budget. Use Value: 94% peak efficiency reduces thermal stress on USB connector and PCB; 2mm × 2mm footprint saves space for miniaturized enclosures. |
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 |
|---|---|---|---|
| TPS62400DRVR | 2.5V–6V input; adjustable outputs via external resistors; 3MHz switching; 300mA per channel; 2.5mm × 2.5mm QFN-16. | Requires external feedback resistors for 1.2V/3.3V setup; lower max current limits suitability for higher-power RF sections. | Select when adjustable outputs and higher input voltage margin (up to 6V) are required; verify thermal derating at 400mA in QFN-16. |
| RT8059ZSP | 2.5V–5.5V input; fixed 1.2V/3.3V outputs; 3MHz switching; 600mA per channel; 3mm × 3mm QFN-16. | Higher current capability and larger package; lacks HyperLight Load™ - 120µA IQ vs. 33µA - reducing light-load battery life. | Select when higher output current headroom or legacy QFN layout compatibility is prioritized over ultra-low IQ and minimal footprint. |
Compared with TPS62400DRVR and RT8059ZSP, the MIC23250-S4YMT-TR delivers superior light-load efficiency and smallest board area due to its 2mm × 2mm footprint and integrated fixed outputs, making it optimal for battery-constrained, space-limited portable designs where 400mA/channel suffices.
Availability
MIC23250-S4YMT-TR is available at Aetrix Electronics and suitable for mobile handsets, portable navigation devices, and USB-powered instrumentation requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for MIC23250-S4YMT-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 fabless semiconductor company specializing in power management, timing, and interface ICs, acquired by Microchip Technology in 2015. Its design heritage emphasizes high-efficiency, small-footprint DC-DC solutions for portable electronics.
The MIC23250 product line was engineered specifically for dual-rail power delivery in ultra-compact battery-powered devices, integrating HyperLight Load™ technology to solve the efficiency-transient-response-size trade-off inherent in traditional buck regulators.
FAQ
What input voltage range does the MIC23250-S4YMT-TR support?
The MIC23250-S4YMT-TR operates from 2.7V to 5.5V, covering standard single-cell Li-ion (2.7–4.2V), USB 5V, and regulated 3.3V supplies. Its under-voltage lockout turns on at 2.55V typical, ensuring reliable startup across battery discharge curves. This range allows direct connection to common portable power sources without intermediate regulation.
How does HyperLight Load™ mode improve efficiency at light loads in the MIC23250-S4YMT-TR?
HyperLight Load™ mode uses pulse-frequency modulation (PFM) with minimum-on/off-time control to reduce switching losses at light loads. The MIC23250-S4YMT-TR achieves 85% efficiency at 1mA output current - far exceeding conventional PWM-only regulators - by only switching when necessary to maintain regulation, thereby minimizing gate drive and transition losses.
Can the MIC23250-S4YMT-TR power both a 1.2V processor core and a 3.3V peripheral simultaneously?
Yes. The MIC23250-S4YMT-TR delivers fixed 1.2V on Channel 1 and fixed 3.3V on Channel 2, each rated for up to 400mA continuous output. Its dual independent enable inputs (EN1/EN2) support controlled sequencing - for example, powering the 1.2V core before enabling the 3.3V I/O rail to meet SoC boot requirements.
What is the recommended inductor and capacitor for the MIC23250-S4YMT-TR?
Micrel specifies a 1µH inductor (e.g., Murata LQM21PN1R0MC0D) and 4.7µF ceramic output capacitors (e.g., TDK C1608X5R0J475K) per channel. These values enable full 4MHz operation, sub-1mm solution height, and optimal balance of transient response, efficiency, and ripple - validated in the official MIC23250-S4YMT-TR typical application circuit.
Does the MIC23250-S4YMT-TR require external feedback resistors to set its output voltages?
No. The MIC23250-S4YMT-TR is a fixed-output variant with factory-trimmed 1.2V and 3.3V outputs. Unlike adjustable versions (e.g., MIC23250-AAYMT), it has no FB1/FB2 pins and uses internal resistor networks - eliminating external components, saving board space, and guaranteeing ±2.5% output accuracy across temperature and load.
MIC23250-S4YMT-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- HyperLight Load®
- Package/Case:
- 10-UFDFN, 10-TMLF®
- 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):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.2V, 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 400mA
- Frequency - Switching:
- 4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-TMLF® (2x2)
MIC23250-S4YMT-TR FAQ
1.How can I place an order for MIC23250-S4YMT-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC23250-S4YMT-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 MIC23250-S4YMT-TR reliable?
The price and inventory of MIC23250-S4YMT-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC23250-S4YMT-TR is usually 5 days.
3.What payment methods are accepted for MIC23250-S4YMT-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC23250-S4YMT-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC23250-S4YMT-TR?
MIC23250-S4YMT-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC23250-S4YMT-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 MIC23250-S4YMT-TR?
For technical support, including MIC23250-S4YMT-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC23250-S4YMT-TR requirements.
6.How does Aetrix verify that MIC23250-S4YMT-TR is sourced from the original manufacturer or authorized distributors?
All MIC23250-S4YMT-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 MIC23250-S4YMT-TR meets industry standards.
7.What is the process for return or replacement of MIC23250-S4YMT-TR?
All MIC23250-S4YMT-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC23250-S4YMT-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 MIC23250-S4YMT-TR part is unused and in its original packaging.
Return procedure for MIC23250-S4YMT-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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