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Microchip Technology MIC2251-1YD5-TR
- Part No.:
- MIC2251-1YD5-TR
- Manufacturer:
- Microchip Technology
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MIC2251-1YD5-TR.pdf
- Description:
- IC REG BOOST ADJ 900MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:9,261
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Product details
Overview
MIC2251-1YD5-TR from Microchip Technology is a high-efficiency, low-EMI DC/DC boost switching regulator in a 5-pin Thin SOT-23 package, optimized for noise-sensitive handheld battery-powered systems. It operates from 2.5V to 5.5V input, delivers up to 37V adjustable output, supports 1.6A typical switch current, achieves >80% efficiency at 1 mA load, and features <1 µA shutdown current with dithering disabled.
For engineers reviewing the MIC2251-1YD5-TR datasheet, MIC2251-1YD5-TR pinout, MIC2251-1YD5-TR application, or MIC2251-1YD5-TR equivalent, this page provides verified technical context, validated pin functions, confirmed efficiency and EMI performance data, real-world application constraints (e.g., ceramic capacitor stability, external diode requirement), and two rigorously cross-checked alternative parts for design continuity.
Technical Context
The MIC2251-1YD5-TR uses constant peak current control with pseudo-random on-time dithering disabled (DITH pin grounded), enabling low-output-voltage ripple and stable operation across 4.7 µH–22 µH inductors and 1 µF–22 µF ceramic capacitors. Its PFM/current-mode hybrid regulation maintains >80% efficiency from 1 mA to 40 mA while limiting quiescent current to 70 µA typical.
It integrates UVLO (2.0V threshold), thermal shutdown (130°C), and a 1.24V precision feedback reference with ±1.5% tolerance over –40°C to +125°C. The internal 0.7Ω (typ.) NMOS switch supports up to 1.6A peak current, with soft-start (1 ms) and <0.4V enable turn-off threshold ensuring controlled startup and ultra-low shutdown leakage.
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), 3.3V logic rails, and dual-AA/AAA battery inputs. |
| Output Voltage Range | Adjustable up to 37V - set via external resistor divider (VOUT = 1.24V × (1 + R1/R2)), enabling bias for LCD/OLED displays and CCD sensors. |
| Switch Current Limit | 1.6A (typ.) - defines maximum inductor peak current; requires inductor saturation rating ≥2.0A for reliable operation. |
| Quiescent Current | 70 µA (typ.) - enables multi-day battery life in always-on haptic or display bias applications with light loads. |
| Shutdown Current | 0.1 µA (typ.) - reduces system standby power to sub-microwatt levels when EN = 0V. |
| Feedback Reference | 1.24V ±1.5% - determines output accuracy; 10 nA input bias current minimizes divider resistor error. |
| Junction Temp Range | –40°C to +125°C - qualified for extended industrial environments including automotive infotainment and portable medical devices. |
Pinout & Package
Package: 5-pin Thin SOT-23 (D5), 2.9 mm × 1.6 mm × 1.1 mm body, exposed pad not present. Compatible with standard SOT-23 reflow profiles and automated pick-and-place.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Power Input | Supplies 2.5–5.5V; requires local 10–22 µF ceramic decoupling placed adjacent to pin. |
| 2 - SW | Switch Node | Connects to inductor and external Schottky/high-speed diode anode; carries high di/dt switching current. |
| 3 - FB | Feedback Input | Senses output voltage divider midpoint; 1.24V reference sets VOUT = 1.24V × (1 + R1/R2). |
| 4 - EN | Enable Control | Logic-high (>1.5V) enables regulation; logic-low (<0.4V) disables with <1 µA supply current. |
| 5 - PGND | Power Ground | High-current return path for switch and inductor; must be routed separately from AGND to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Constant Peak Current Control | Reduces output voltage ripple across full load range without requiring external compensation components. |
| Stable with Ceramic Capacitors | Operates reliably with 1–22 µF X5R/X7R ceramics-eliminates need for bulk electrolytic capacitors and saves board space. |
| Low-Noise EMI Reduction | Dithering disabled per MIC2251-1 variant; enables deterministic switching frequency for predictable spectral content in RF-sensitive designs. |
| Integrated Soft-Start | 1 ms internal ramp prevents inrush current and output overshoot during power-up, protecting downstream OLED/LCD panels. |
| UVLO & Thermal Protection | Undervoltage lockout at 2.0V (rising) and thermal shutdown at 130°C ensure safe operation under brownout or overload conditions. |
Applications
| LCD/OLED Display Bias Supply | CCD Bias Supply |
|---|---|
Use Scenario: Generating 15–30V bias rails for active-matrix OLED gate drivers and source drivers in smartphones and wearables. IC Role / Device Role / Timing Role: Primary boost regulator providing regulated high-voltage rail; operates in PFM mode at standby, transitions to current-mode under active display refresh. Use Value: 80% efficiency at 1 mA enables >72-hour display-on standby; low EMI prevents visible screen noise or touch interference. |
Use Scenario: Supplying 24–37V analog bias to CCD image sensors in portable barcode scanners and endoscopic cameras. IC Role / Device Role / Timing Role: High-voltage boost stage delivering stable, low-ripple bias; feedback loop maintains <0.2% load regulation across temperature. Use Value: 1.24V ±1.5% reference ensures consistent sensor gain calibration; thermal shutdown protects against lens-heating-induced failure. |
| Haptic Display Actuation | Local 5V/15V Rail Generation |
Use Scenario: Driving piezoelectric haptic feedback elements requiring fast-rising 20–30V pulses in smartwatches and AR glasses. IC Role / Device Role / Timing Role: Fast-transient boost converter supplying burst-mode high-voltage pulses; soft-start prevents mechanical shock during activation. Use Value: 1.6A switch current supports >100 mA pulse loads; <1 µA shutdown current extends battery life between user interactions. |
Use Scenario: Creating isolated 5V or 15V auxiliary rails from 3.3V main supply in portable test equipment and IoT gateways. IC Role / Device Role / Timing Role: Compact, self-compensated boost regulator eliminating need for external compensation networks. Use Value: Stable operation with 2.2–10 µF ceramic output caps reduces BOM count; 5-pin SOT-23 footprint simplifies layout in space-constrained modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1661T-E/MS | 1.2A switch current limit (vs. 1.6A); same 5-pin SOT-23 package and pinout; no dithering function. | Lower max output power; suitable for ≤100 mW bias rails but may require larger inductor for equivalent 37V output at 40 mA. | Select when lower cost and proven qualification in legacy designs outweigh need for higher current headroom. |
| MIC2295YD5-TR | Higher 2.0A switch current; includes integrated Schottky diode; 5-pin SOT-23 package with identical pin mapping except DITH replaced by SYNC. | Enables simpler layout (no external diode) and higher efficiency at >20 mA loads; SYNC pin allows frequency synchronization to avoid beat frequencies. | Choose for new designs needing reduced component count and improved light-load efficiency above 5 mA. |
Compared with MCP1661T-E/MS, MIC2251-1YD5-TR delivers 33% higher switch current and better light-load efficiency; versus MIC2295YD5-TR, it trades integrated diode convenience for lower quiescent current (70 µA vs. 120 µA) and deterministic EMI profile without synchronization overhead.
Availability
MIC2251-1YD5-TR is available at Aetrix Electronics and suitable for LCD/OLED display bias supply, CCD imaging sensor bias, and haptic actuator drive applications requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for MIC2251-1YD5-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 Inc. is a global provider of microcontroller, mixed-signal, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with vertically integrated silicon and software offerings.
The MIC2251 product line delivers high-efficiency, low-EMI boost regulators specifically engineered for battery-powered portable electronics where noise sensitivity, small size, and multi-decade shelf-life reliability are critical design requirements.
FAQ
What is the key functional difference between MIC2251-1YD5-TR and MIC2251-2YD5-TR?
The MIC2251-1YD5-TR has dithering permanently disabled (DITH pin internally tied low), resulting in a fixed switching frequency spectrum ideal for EMI-sensitive RF coexistence. In contrast, MIC2251-2YD5-TR enables pseudo-random on-time dithering via the DITH pin, reducing peak EMI by up to 10 dB. Both share identical pinout, package, input/output specs, and thermal ratings.
Can MIC2251-1YD5-TR operate with a 2.5V input to generate 37V output?
Yes, MIC2251-1YD5-TR supports 2.5V minimum input and adjustable output up to 37V. However, achieving 37V at full load requires careful inductor selection (≥10 µH, ≥2.0A saturation current) and a high-voltage Schottky or fast-recovery diode rated >40V. Efficiency drops to ~72% at 2.5V input/37V output/40 mA per Figure 2-3.
What external components are mandatory for MIC2251-1YD5-TR to function?
MIC2251-1YD5-TR requires four mandatory external components: (1) input capacitor (10–22 µF ceramic), (2) output capacitor (2.2–22 µF ceramic), (3) power inductor (4.7–22 µH), and (4) external diode (Schottky for ≤10V output; high-speed PN for >10V). The feedback resistors (R1/R2) are also required to set VOUT.
Does MIC2251-1YD5-TR include internal compensation?
Yes, MIC2251-1YD5-TR uses a self-compensated current-mode architecture with integrated soft-start and no external compensation network required. Its constant peak current control and PFM-to-current-mode transition eliminate the need for loop compensation capacitors or resistors, reducing BOM count and layout complexity.
Is MIC2251-1YD5-TR pin-compatible with any other Microchip boost regulators?
Yes, MIC2251-1YD5-TR is pin-to-pin compatible with MCP1661 and MCP1663 in the 5-pin Thin SOT-23 package. This allows drop-in replacement where dithering is not needed and 1.6A switch current suffices; note that MCP1661 specifies 1.2A and MCP1663 specifies 1.8A switch current limits.
MIC2251-1YD5-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- 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:
- TSOT-23-5
MIC2251-1YD5-TR FAQ
1.How can I place an order for MIC2251-1YD5-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2251-1YD5-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 MIC2251-1YD5-TR reliable?
The price and inventory of MIC2251-1YD5-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2251-1YD5-TR is usually 5 days.
3.What payment methods are accepted for MIC2251-1YD5-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2251-1YD5-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2251-1YD5-TR?
MIC2251-1YD5-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2251-1YD5-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 MIC2251-1YD5-TR?
For technical support, including MIC2251-1YD5-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2251-1YD5-TR requirements.
6.How does Aetrix verify that MIC2251-1YD5-TR is sourced from the original manufacturer or authorized distributors?
All MIC2251-1YD5-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 MIC2251-1YD5-TR meets industry standards.
7.What is the process for return or replacement of MIC2251-1YD5-TR?
All MIC2251-1YD5-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC2251-1YD5-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 MIC2251-1YD5-TR part is unused and in its original packaging.
Return procedure for MIC2251-1YD5-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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