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Microchip Technology MIC2571-1YMM
- Part No.:
- MIC2571-1YMM
- Manufacturer:
- Microchip Technology
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MIC2571-1YMM.pdf
- Description:
- IC REG BOOST PROG 1A 8MSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MIC2571-1YMM from Micrel is a micropower single-cell boost switching regulator IC designed for ultra-low-voltage battery-powered systems. It operates from 0.9V to 15V input, delivers selectable fixed outputs of 2.85V/3.3V/5V, features 120µA typical quiescent current, 20kHz fixed switching frequency with SYNC capability, and integrates a 1A current-limited NPN pass switch - enabling compact 0.3 in² DC-DC conversion in handheld instruments and LCD bias supplies.
For engineers reviewing the MIC2571-1YMM datasheet, MIC2571-1YMM pinout, MIC2571-1YMM application, or MIC2571-1YMM equivalent, key selection criteria include its single-cell startup capability (down to 0.9V), externally selectable output voltage configuration, MSOP-8 thermal performance (θJA = 240°C/W), and gated-oscillator architecture enabling high light-load efficiency.
Technical Context
The MIC2571-1YMM implements a gated-oscillator boost topology where the internal NPN switch is disabled when output voltage exceeds the feedback threshold, reducing quiescent current to 120µA. Its comparator uses a stable 0.22V bandgap reference with 6mV hysteresis, and output hysteresis scales to 65–120mV depending on selected voltage (2.85V/3.3V/5V).
Switch control is driven by an AND-gated oscillator running at 20kHz (67% nominal duty cycle), synchronized via the SYNC pin's falling-edge trigger. The SW pin serves as the collector of the integrated NPN transistor, requiring external inductor, Schottky diode, and input/output capacitors - with minimal component count enabling full regulation in <0.3 in² PCB area.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 0.9V to 15V - enables direct operation from single alkaline/NiMH/Li primary cells across full discharge curve. |
| Output Voltage Options | 2.85V / 3.3V / 5V - selected by connecting corresponding feedback pin (2.85V, 3.3V, or 5V) to VOUT; no external resistor divider needed. |
| Quiescent Current | 120µA typical - ensures multi-year battery life in low-duty-cycle portable devices like remote controls and detectors. |
| Switch Current Limit | 1.1A - protects internal NPN transistor and external inductor during overload or short-circuit conditions. |
| Switching Frequency | 20kHz fixed - avoids audible noise while enabling use of small, low-cost 150µH inductors and minimizing EMI filtering requirements. |
| Thermal Resistance | θJA = 240°C/W - defines power dissipation limit (250mW max in MSOP-8) for ambient temperatures up to +85°C. |
| Feedback Reference | 0.22V internal bandgap - provides stable regulation point independent of input voltage or temperature drift. |
Pinout & Package
Package: 8-lead MSOP (MM), 3.0mm × 3.0mm × 0.85mm body, exposed pad not electrically connected, rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SW | Switch Collector | Collector of internal NPN transistor; connects to inductor and Schottky diode anode - carries pulsed 1.1A peak current. |
| 2 - GND | Power Ground | Emiter connection of internal NPN switch; must be low-impedance return path for switch current and feedback reference. |
| 3 - NC | No Connect | Not internally bonded; left floating or grounded per layout best practice - no electrical function. |
| 4 - 5V | 5V Feedback Input | Connects to VOUT to select 5.00V regulated output; internal resistive divider sets exact 5V threshold (±1.5% over temp). |
| 5 - 3.3V | 3.3V Feedback Input | Connects to VOUT to select 3.30V regulated output; internal divider yields precise 3.3V (±1.5% over temp). |
| 6 - 2.85V | 2.85V Feedback Input | Connects to VOUT to select 2.85V regulated output; internal divider ensures accurate 2.85V (±1.5% over temp). |
| 7 - SYNC | Synchronization Input | Falling-edge triggered; resets oscillator to align switching with external clock - reduces system-wide EMI coupling. |
| 8 - IN | Supply Input | Positive input rail (0.9–15V); requires local 47µF low-ESR capacitor within 4 inches to minimize voltage droop during switch turn-on. |
Key Features
| Feature | Design Value |
|---|---|
| Gated Oscillator Architecture | Disables internal switch when output is in regulation - cuts quiescent current to 120µA and eliminates switching losses at light loads. |
| Single-Cell Startup | Guaranteed operation down to 0.9V input - supports full discharge of alkaline, NiMH, and lithium primary cells without brownout. |
| Fixed Output Selection | Three dedicated feedback pins (2.85V/3.3V/5V) eliminate external resistors - simplifies BOM and improves accuracy vs. adjustable versions. |
| Low-Component Count Design | Requires only inductor, Schottky diode, and two capacitors - achieves complete boost regulator in <0.3 in² PCB area. |
| SYNC Pin EMI Control | Allows synchronization to system clock - prevents beat frequencies and enables deterministic noise placement for EMC compliance. |
Applications
| Pagers | LCD Bias Generator |
|---|---|
Use Scenario: Powering segmented LCD displays in legacy paging devices with single AA/AAA battery. IC Role / Device Role / Timing Role: Boost regulator providing stable 5V rail from 1.0–1.5V battery source; SW pin drives 150µH inductor at 20kHz. Use Value: Enables >2-year battery life via 120µA quiescent current and gated operation during display idle periods. | Use Scenario: Generating positive and negative bias voltages (e.g., +5V/–5V) for monochrome STN LCD modules. IC Role / Device Role / Timing Role: Primary boost stage in charge-pump-assisted dual-rail generator; 3.3V output selected for logic interface compatibility. Use Value: Fixed 3.3V option eliminates resistor tolerance errors - ensures consistent VCOM voltage and contrast stability across temperature. |
| Battery-Powered Hand-Held Instruments | Palmtop Computers |
Use Scenario: Supplying 5V to microcontroller peripherals and sensors in portable multimeters or gas detectors. IC Role / Device Role / Timing Role: Main DC-DC converter stepping up single-cell voltage; SYNC pin tied to MCU timer output for noise coordination. Use Value: 1.1A current limit protects circuit during sensor actuation surges - avoids regulator shutdown during critical measurement cycles. | Use Scenario: Powering 3.3V I/O and memory subsystems in early palmtop PCs using AA batteries. IC Role / Device Role / Timing Role: Core power IC delivering regulated 3.3V from declining 1.0–1.5V cell; 20kHz switching avoids audio-band interference with speaker drivers. Use Value: MSOP-8 package allows dense layout in space-constrained clamshell designs - footprint matches adjacent logic ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX680ESA+ | Charge-pump topology (no inductor); fixed 5V output; 100µA quiescent current; requires two flying capacitors. | Lower EMI and smaller solution size, but limited to 5V and <100mA load; cannot support 3.3V/2.85V or >5V outputs. | Select MAX680ESA+ only for ultra-low-noise, low-current 5V generation where inductor avoidance is critical. |
| TPS61200DRCR | Inductor-based boost; adjustable output (0.9–5.5V); 5.5µA quiescent current; 1.2A switch; 500kHz to 3MHz programmable frequency. | Superior light-load efficiency and higher switching frequency enable smaller magnetics, but requires external feedback resistors and lacks pin-selectable voltages. | Select TPS61200DRCR when ultra-low IQ or wide output adjustability outweighs simplicity of MIC2571-1YMM's fixed-voltage pin-strapping. |
Compared with MAX680ESA+ and TPS61200DRCR, the MIC2571-1YMM uniquely balances ultra-low-input operation (0.9V), pin-selectable fixed outputs, and minimal external components - making it optimal for cost-sensitive, space-constrained single-cell systems where 2.85V/3.3V/5V flexibility matters more than sub-µA quiescent current or MHz-frequency magnetics reduction.
Availability
MIC2571-1YMM is available at Aetrix Electronics and suitable for pagers, LCD bias generators, battery-powered hand-held instruments, palmtop computers, and remote controls requiring stable component supply across extended product lifecycles.
Supply support for MIC2571-1YMM 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 founded in 1978 and acquired by Microchip Technology in 2015; known for high-performance power management, timing, and interface ICs.
The MIC2571 family was designed specifically for ultra-low-voltage, single-cell boost conversion in portable consumer and industrial equipment - prioritizing startup reliability below 1V and minimal external component count over high-frequency switching or digital control.
FAQ
What input voltage range does the MIC2571-1YMM support?
The MIC2571-1YMM supports an input voltage range of 0.9V to 15V, enabling reliable startup and operation directly from a single alkaline, NiMH, or lithium primary cell across its full discharge curve. This 0.9V minimum is verified under load conditions (ISW = 100mA) and guarantees functionality even as the battery depletes - a key differentiator for long-life portable applications. The MIC2571-1YMM maintains regulation throughout this range without requiring auxiliary start-up circuitry.
How do I configure the MIC2571-1YMM for 3.3V output?
To configure the MIC2571-1YMM for 3.3V output, connect the 3.3V pin (Pin 5) directly to the output node (VOUT); leave the 2.85V (Pin 6) and 5V (Pin 4) pins unconnected. This activates the internal precision resistive divider calibrated for 3.30V ±1.5% over temperature. The MIC2571-1YMM does not require external resistors or trimming - the 3.3V setting is factory-trimmed and stable across –40°C to +85°C ambient.
Does the MIC2571-1YMM require an external diode, and what type is recommended?
Yes, the MIC2571-1YMM requires an external Schottky diode connected between the SW pin and VOUT. The datasheet specifies Motorola MBR0530 (or equivalent 30V, 0.5A Schottky) as the reference part due to its low forward voltage (<0.35V @ 500mA) and fast recovery - critical for maintaining efficiency and preventing reverse current flow during switch off-time. Standard silicon diodes (e.g., 1N400x) are unsuitable due to excessive forward drop and slow switching.
What is the purpose of the SYNC pin on the MIC2571-1YMM?
The SYNC pin on the MIC2571-1YMM accepts a falling-edge-triggered external clock signal to synchronize the internal 20kHz oscillator - enabling deterministic switching alignment with system clocks and reducing broadband EMI through spectral concentration. When unused, the SYNC pin must be grounded to prevent spurious oscillation; it is not internally pulled down. The MIC2571-1YMM's SYNC functionality does not alter regulation accuracy or output voltage stability.
Can the MIC2571-1YMM drive a 100mA load at 5V from a 1.2V input?
No - the MIC2571-1YMM is not rated for 100mA continuous output at 5V from 1.2V input. Its 1.1A switch current limit and 20kHz frequency constrain practical output current to ~5–15mA depending on input voltage, inductor value, and efficiency. At 1.2V input and 5V output, the theoretical maximum continuous load is ~8mA (per design examples and thermal limits). For 100mA, a higher-frequency, higher-efficiency boost IC like TPS61200 is required - the MIC2571-1YMM targets ultra-low-power, low-current applications.
MIC2571-1YMM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Programmable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 0.9V
- Voltage - Input (Max):
- 15V
- Voltage - Output (Min/Fixed):
- 2.85V, 3.3V, 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 1A (Switch)
- Frequency - Switching:
- 20kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
MIC2571-1YMM FAQ
1.How can I place an order for MIC2571-1YMM through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2571-1YMM 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 MIC2571-1YMM reliable?
The price and inventory of MIC2571-1YMM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2571-1YMM is usually 5 days.
3.What payment methods are accepted for MIC2571-1YMM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2571-1YMM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2571-1YMM?
MIC2571-1YMM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2571-1YMM 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 MIC2571-1YMM?
For technical support, including MIC2571-1YMM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2571-1YMM requirements.
6.How does Aetrix verify that MIC2571-1YMM is sourced from the original manufacturer or authorized distributors?
All MIC2571-1YMM 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 MIC2571-1YMM meets industry standards.
7.What is the process for return or replacement of MIC2571-1YMM?
All MIC2571-1YMM units undergo pre-shipment inspection (PSI). If there is an issue with MIC2571-1YMM, 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 MIC2571-1YMM part is unused and in its original packaging.
Return procedure for MIC2571-1YMM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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