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Microchip Technology MIC2251YML-TR
- Part No.:
- MIC2251YML-TR
- Manufacturer:
- Microchip Technology
- Package:
- 8-VFDFN Exposed Pad, 8-MLF®
- Datasheet:
-
MIC2251YML-TR.pdf
- Description:
- IC REG BOOST ADJ 900MA 8MLF
- Quantity:
- Payment:
- Shipping:
Inventory:2,453
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Product details
Overview
MIC2251YML-TR from Microchip Technology is a high-efficiency, low-EMI DC/DC boost switching regulator in an 8-pin 2 mm × 2 mm leadless DFN package, supporting 2.5V–5.5V input, adjustable up to 37V output, 1.6A typical switch current, and <1 µA shutdown current-designed for LCD/OLED bias supplies in portable battery-powered devices.
For engineers reviewing the MIC2251YML-TR datasheet, MIC2251YML-TR pinout, MIC2251YML-TR application, or MIC2251YML-TR equivalent, key selection criteria include its pseudo-random dithering capability (enabled via DITH pin), stable operation with ceramic capacitors ≥1 µF, and –40°C to +125°C junction temperature range for industrial-grade reliability.
Technical Context
The MIC2251YML-TR employs constant peak current control with PFM/current-mode hybrid regulation to maintain high efficiency (≥80% at 1 mA, up to 90% at 100 mA) across wide load ranges. Its internal NMOS switch features 0.7 Ω typical RON and 1.6A current limit, enabling compact boost designs with minimal external components.
EMI reduction is achieved through integrated pseudo-random on-time dithering (±20% frequency spread), activated by pulling the DITH pin high. The device uses separate AGND and PGND pins to isolate analog reference paths from high-current switching loops, ensuring stable feedback at 1.24V ±1.5% over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - compatible with single-cell Li-ion (3.0–4.2V) and dual-cell alkaline (2.4–3.2V) sources. |
| Output Voltage Range | Adjustable up to 37V - set via external resistor divider (VOUT = 1.24V × (1 + R1/R2)), supporting LCD gate drivers and CCD bias rails. |
| Switch Current Limit | 1.6A (typ.) - defines maximum inductor peak current; requires inductor saturation rating ≥2.0A for margin. |
| Quiescent Current | 70 µA (typ.) - enables >100-hour standby in always-on haptic or sensor modules powered from coin cells. |
| Shutdown Current | 0.1 µA (typ.) - reduces system leakage to sub-nA levels when paired with external enable logic. |
| Feedback Reference | 1.24V ±1.5% - sets output accuracy; tolerance directly impacts VOUT error (e.g., ±15.5 mV at 1.24V → ±1.25% at 12V). |
| Junction Temp Range | –40°C to +125°C - validated for automotive infotainment displays and industrial handhelds without derating. |
Pinout & Package
Package: 8-pin 2 mm × 2 mm leadless DFN (ML), exposed thermal pad (HS PAD) requiring solder connection to PCB ground plane for thermal management and EMI suppression.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Feedback input | Senses output voltage via resistor divider; 1.24V reference sets regulation point; input bias current ≤10 nA minimizes divider error. |
| 2 AGND | Analog ground | Reference return for error amplifier and bandgap; must be routed separately from power ground to avoid noise coupling. |
| 3 PGND | Power ground | High-current return path for switch node and inductor; connects to HS PAD for thermal conduction and low-impedance grounding. |
| 4 SW | Switch node | Drain of internal NMOS; connects to inductor and external diode cathode; handles pulsed currents up to 1.6A. |
| 5 NC | No connect | Internally unconnected; must remain floating-no routing or stitching to ground or signal planes. |
| 6 VIN | Input supply | Accepts 2.5–5.5V; requires local 10–22 µF ceramic capacitor placed within 3 mm of pin to suppress input ripple. |
| 7 DITH | Dithering control | Pull high (≥1.5V) to enable ±20% frequency spreading for EMI reduction; tie to GND to disable dithering. |
| 8 EN | Enable input | Logic-high (>1.5V) enables regulation; logic-low (<0.4V) shuts down IC with <1 µA supply current; must not float. |
Key Features
| Feature | Design Value |
|---|---|
| Pseudo-random dithering | Reduces EMI peaks by up to 10 dB via ±20% on-time modulation-critical for passing CISPR-22 Class B emissions in handhelds. |
| Constant peak current control | Minimizes output voltage ripple across load range by maintaining fixed inductor current peaks, eliminating need for output LC tuning. |
| Stable with small ceramics | Operates reliably with 1–22 µF X5R/X7R output capacitors-enables space-constrained layouts without tantalum or electrolytic bulk caps. |
| Separate AGND/PGND | Prevents switching noise from corrupting feedback sensing; requires split ground plane with single-point connection near PGND/AGND pins. |
| UVLO and thermal shutdown | Undervoltage lockout triggers at 2.0V (rising); thermal shutdown activates at 130°C with 15°C hysteresis-protects against battery sag and PCB overheating. |
Applications
| LCD/OLED Display Bias Supply | CCD Bias Supply |
|---|---|
Use Scenario: Generating 15–30V gate drive voltages for active-matrix OLED panels in smartwatches and medical diagnostic handhelds. IC Role / Device Role / Timing Role: Primary boost regulator delivering regulated high-voltage rail; operates in PFM mode at light loads to extend battery life. Use Value: 80% efficiency at 1 mA enables >200-hour display-on time from 100 mAh coin cell; dithering ensures EMI compliance near sensitive RF receivers. | Use Scenario: Providing precise 24V bias for charge-coupled device image sensors in portable spectrometers and barcode scanners. IC Role / Device Role / Timing Role: High-accuracy voltage source with <0.3% line regulation-maintains sensor gain stability across battery discharge curve. Use Value: 1.24V ±1.5% reference and low 10 nA FB bias current minimize output drift; thermal shutdown prevents sensor damage during extended field use. |
| Haptic Display Drivers | Local 5V/15V Rail Generation |
Use Scenario: Powering piezoelectric actuators requiring 30–37V pulses in smartphone touch feedback systems. IC Role / Device Role / Timing Role: Fast-transient boost stage triggered by MCU PWM signals; soft-start prevents actuator snap-in during power-up. Use Value: 1 ms soft-start time limits inrush current; 1.6A switch current supports 50 mA peak actuator loads without dropout. | Use Scenario: Creating isolated auxiliary rails (e.g., 5V for USB PHY, 15V for op-amp bias) from 3.3V main system supply in IoT edge nodes. IC Role / Device Role / Timing Role: Compact secondary regulator replacing discrete charge-pump solutions; operates continuously in current-mode above 1W load. Use Value: 90% peak efficiency at 100 mA reduces thermal load on dense PCBs; DFN-8 package fits within 4 mm² footprint. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61088RHLR | Higher 5.5A switch current, wider 2.7–12V input, but larger 3 mm × 3 mm QFN-16 package and no dithering function. | Better suited for high-power USB PD sink applications; lacks EMI-reduction circuitry needed for RF-cohabitant designs. | Select TPS61088RHLR only when >2A output current or >12V input is required; MIC2251YML-TR remains preferred for EMI-sensitive, space-constrained bias rails. |
| MCP1662-E/MS | Same Microchip family, 5-pin SOT-23 package, 1.2A switch current, no DITH pin-dithering disabled by default. | Lacks EMI dithering and has lower current capability; suitable only for cost-sensitive, non-RF applications where board area is less constrained than height. | Choose MCP1662-E/MS for legacy SOT-23 footprints or simplified BOMs; MIC2251YML-TR provides superior EMI performance and thermal headroom in DFN-8. |
Compared with TPS61088RHLR and MCP1662-E/MS, the MIC2251YML-TR delivers optimal balance of ultra-low EMI, compact 2 mm × 2 mm footprint, and industrial temperature range-making it the most suitable choice for noise-critical, size-limited bias generation in portable electronics.
Availability
MIC2251YML-TR is available at Aetrix Electronics and suitable for LCD/OLED display bias supplies, CCD imaging systems, haptic feedback modules, and local high-voltage rail generation requiring stable component supply across automotive, industrial, and consumer design cycles.
Supply support for MIC2251YML-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
Microchip Technology is a U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and power management ICs, with global design centers and ISO 9001-certified manufacturing.
The MIC2251 product line targets noise-sensitive, battery-powered portable electronics, delivering high-efficiency boost conversion with integrated EMI mitigation-specifically engineered for display bias, sensor excitation, and auxiliary rail generation in space-constrained environments.
FAQ
What is the maximum output voltage achievable with the MIC2251YML-TR?
The MIC2251YML-TR supports adjustable output voltage up to 37V, set by an external resistor divider connected to the FB pin using the formula VOUT = 1.24V × (1 + R1/R2). This capability is verified in the datasheet's Electrical Characteristics table and confirmed in Application Note AN20006487A, where 30V and 37V configurations are demonstrated with stable regulation and <2% load regulation error.
Does the MIC2251YML-TR require an external diode, and what type is recommended?
Yes, the MIC2251YML-TR requires an external diode for flyback energy transfer. For outputs ≤10V, a Schottky diode (e.g., Vishay SL04) is recommended due to low forward voltage drop. For higher voltages like 24V, a high-speed silicon diode (e.g., LS4148) is preferred to minimize leakage current-reducing no-load input current from 2.1 mA (Schottky) to 0.37 mA at 70°C, as measured in Figure 5-2 of the datasheet.
How does the DITH pin affect EMI performance of the MIC2251YML-TR?
The DITH pin enables pseudo-random on-time dithering, spreading the switching frequency spectrum to reduce EMI peaks by up to 10 dB, as shown in Figure 2-17 of the datasheet. When pulled high (≥1.5V), it introduces ±20% variation in on-time; when grounded, dithering is disabled. This feature is unique to the MIC2251 family and critical for passing radiated emissions tests in handheld devices.
What is the thermal resistance (θJA) of the MIC2251YML-TR package, and how does it impact layout?
The MIC2251YML-TR in its 2 mm × 2 mm DFN-8 package has a typical junction-to-ambient thermal resistance (θJA) of 90°C/W, per Table 4-1. To maintain TJ ≤125°C at full load, the PCB must provide adequate copper area under the exposed HS PAD-Microchip recommends a minimum 12 mm² thermal pad connected to inner-layer ground planes via ≥4 thermal vias (0.3 mm diameter).
Can the MIC2251YML-TR operate with ceramic output capacitors smaller than 2.2 µF?
Yes-the MIC2251YML-TR is stable with ceramic output capacitors as low as 1 µF, as stated in the General Description and confirmed in Section 5.4. However, values below 2.2 µF may increase output voltage ripple and degrade transient response; 2.2–22 µF is recommended for optimal performance across load steps, especially in applications like CCD bias where voltage stability directly affects image quality.
MIC2251YML-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-VFDFN Exposed Pad, 8-MLF®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.24V
- Voltage - Output (Max):
- 37V
- Current - Output:
- 900mA (Switch)
- Frequency - Switching:
- Up to 2.5MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MLF® (2x2)
MIC2251YML-TR FAQ
1.How can I place an order for MIC2251YML-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2251YML-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 MIC2251YML-TR reliable?
The price and inventory of MIC2251YML-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2251YML-TR is usually 5 days.
3.What payment methods are accepted for MIC2251YML-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2251YML-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2251YML-TR?
MIC2251YML-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2251YML-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 MIC2251YML-TR?
For technical support, including MIC2251YML-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2251YML-TR requirements.
6.How does Aetrix verify that MIC2251YML-TR is sourced from the original manufacturer or authorized distributors?
All MIC2251YML-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 MIC2251YML-TR meets industry standards.
7.What is the process for return or replacement of MIC2251YML-TR?
All MIC2251YML-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC2251YML-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 MIC2251YML-TR part is unused and in its original packaging.
Return procedure for MIC2251YML-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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