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Microchip Technology MIC2571-2BMM-TR
- Part No.:
- MIC2571-2BMM-TR
- Manufacturer:
- Microchip Technology
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MIC2571-2BMM-TR.pdf
- Description:
- IC REG BOOST ADJ 1A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,687
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Product details
Overview
MIC2571-2BMM-TR from Micrel is a micropower adjustable-output boost switching regulator designed for single-cell battery systems (0.9V–15V input), delivering up to 36V output with 1.1A current limiting and 20kHz fixed-frequency operation. It integrates a gated-oscillator architecture, internal 0.22V reference, and SYNC input for noise reduction in portable instrumentation and LCD bias supplies.
For engineers reviewing the MIC2571-2BMM-TR datasheet, MIC2571-2BMM-TR pinout, MIC2571-2BMM-TR application, or MIC2571-2BMM-TR equivalent, key selection factors include its adjustable feedback threshold (0.22V), MSOP-8 package footprint, 120µA quiescent current, and compatibility with low-ESR tantalum output capacitors in space-constrained battery-powered designs.
Technical Context
The MIC2571-2BMM-TR implements a gated-oscillator boost topology where the NPN switch (SW pin) is disabled when output voltage exceeds the comparator threshold (0.22V at FB), minimizing quiescent current. Its oscillator operates at a fixed 20kHz with 67% duty cycle optimized for ~3× VIN-to-VOUT ratios.
Feedback is applied via external resistor divider to the FB pin, referencing the stable 0.22V bandgap. The SYNC pin accepts falling-edge-triggered external clock signals to synchronize switching and reduce EMI, while current limiting modifies duty cycle-not frequency-above 1.2A to protect the switch and inductor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 0.9V to 15V - supports alkaline, NiMH, or lithium single-cell sources across full discharge curve. |
| Output Voltage Range | Up to 36V - set by external resistor divider on FB pin; enables flexible bias generation for LCDs or sensors. |
| Quiescent Current | 120µA typical - enables multi-year battery life in low-duty-cycle remote controls and detectors. |
| Switch Current Limit | 1.1A - protects internal NPN pass element and external inductor during overload or short-circuit events. |
| Oscillator Frequency | 20kHz fixed - balances efficiency and component size; synchronizable via SYNC pin to suppress system-level noise. |
| Reference Voltage | 0.22V ±6mV hysteresis - high-precision bandgap reference ensures stable regulation across –40°C to +85°C. |
| Package | 8-lead MSOP (MM) - 3mm × 3mm footprint with exposed pad thermal path; compatible with standard SMT reflow. |
Pinout & Package
8-lead MSOP (MM) package with θJA = 240°C/W and rated for –40°C to +85°C ambient operation. Exposed pad recommended for thermal relief.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Supply Input | Positive input voltage connection (0.9V–15V); decoupled with ≥47µF low-ESR capacitor near pin. |
| 2 (SYNC) | Synchronization Input | Falling-edge triggered; grounds unused to prevent spurious oscillation; enables EMI control in mixed-signal systems. |
| 3 (FB) | Feedback Input | 0.22V reference node; connects to center tap of external resistor divider to set VOUT = 0.22V × (1 + R2/R1). |
| 4 (NC) | No Connect | Not internally bonded; must remain unconnected per datasheet to avoid latch-up or parametric shift. |
| 5 (SW) | Switch Collector | NPN transistor collector output; drives external inductor; requires Schottky diode (e.g., MBR0530) and low-DCR inductor (e.g., 150µH). |
| 6 (GND) | Power Ground | Emiter return for internal NPN switch; must be low-impedance plane tied directly to input/output capacitor grounds. |
| 7 (NC) | No Connect | Not internally bonded; leave floating or grounded only if required by PCB layout symmetry. |
| 8 (NC) | No Connect | Not internally bonded; no electrical function; avoid routing signals underneath. |
Key Features
| Feature | Design Value |
|---|---|
| Gated Oscillator Architecture | Disables SW pin when VOUT > regulation threshold, reducing quiescent current to 120µA and improving light-load efficiency. |
| Adjustable Output (0.22V Reference) | Enables precise VOUT setting from VIN to 36V using two external resistors-no trimming required. |
| SYNC Input for Noise Control | Allows correlation of switching edges with system clocks, suppressing broadband EMI in sensitive RF or audio subsystems. |
| 1.1A Internal Current Limit | Soft-limiting behavior prevents destructive inductor saturation while maintaining safe thermal operation under transient overloads. |
| MSOP-8 Footprint | 0.3 in² total solution area (excluding input cap) meets strict size constraints in pagers, palmtops, and handheld medical devices. |
Applications
| LCD Bias Generator | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Generating +12V and –12V rails for segment LCD displays in handheld test meters. IC Role / Device Role / Timing Role: Boost regulator providing isolated positive and negative bias voltages from a single 1.5V alkaline cell. Use Value: Eliminates need for dual-supply charge pumps; achieves <100mV ripple with 15µF/25V tantalum output caps and 0.22Ω ESR. | Use Scenario: Powering low-current analog front-ends (e.g., op-amps, ADC references) in portable gas detectors. IC Role / Device Role / Timing Role: High-efficiency step-up converter delivering stable 5V from fading NiMH cells (1.0V–1.4V). Use Value: 120µA quiescent current extends battery life beyond 2 years in sleep-mode dominant applications. |
| Remote Control Power Supply | Battery Backup Supply |
Use Scenario: Enabling IR LED drive at 3.3V from a single AA cell in universal remotes. IC Role / Device Role / Timing Role: Compact boost regulator powering microcontroller I/O and IR emitter during brief active bursts. Use Value: 20kHz switching avoids audible noise; 0.3 in² board area allows integration into slim form-factor enclosures. | Use Scenario: Maintaining RTC and SRAM voltage during main power loss in industrial controllers. IC Role / Device Role / Timing Role: Low-quiescent boost stage sustaining 3.3V rail from backup coin cell (e.g., CR2032) during AC failure. Use Value: Operates down to 0.9V input, enabling >90% of coin cell capacity utilization before brownout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX682ESA+ | Fixed 5V output; 300kHz switching; 350µA quiescent current; SO-8 package. | Limited to fixed 5V; higher IQ reduces battery life in ultra-low-power use cases. | Select when fixed 5V output suffices and higher switching frequency enables smaller magnetics. |
| TPS61099YFFR | Adjustable 1.8–5.5V output; 1.2MHz switching; 0.6µA shutdown current; 6-pin WSON. | Max output 5.5V only; unsuitable for >12V LCD bias or detector HV rails. | Prefer for sub-5V logic supply where minimal IQ and tiny footprint outweigh voltage range needs. |
Compared with MAX682ESA+ and TPS61099YFFR, the MIC2571-2BMM-TR uniquely supports up to 36V output with 120µA quiescent current in an MSOP-8, making it the only viable choice for high-voltage, single-cell portable bias generation without external MOSFETs or transformers.
Availability
MIC2571-2BMM-TR is available at Aetrix Electronics and suitable for LCD bias generators, battery-powered instrumentation, remote controls, and battery backup supplies requiring stable component supply across extended product lifecycles.
Supply support for MIC2571-2BMM-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 founded in 1978 and acquired by Microchip Technology in 2015. Known for precision power management and timing solutions.
The MIC2571 family was designed specifically for ultra-low-input-voltage boost conversion in space- and energy-constrained portable electronics, emphasizing micropower operation and minimal external component count.
FAQ
What is the minimum input voltage required for MIC2571-2BMM-TR startup?
The MIC2571-2BMM-TR guarantees startup at 0.9V input under load conditions up to 100mA. This enables reliable operation across the full discharge curve of alkaline, NiMH, and lithium primary cells. Below 0.9V, regulation may not be maintained, though the device remains functional down to ~0.7V in no-load conditions. Always verify startup margin with worst-case battery ESR and temperature in final design.
Can MIC2571-2BMM-TR generate negative output voltages?
Yes, the MIC2571-2BMM-TR can generate negative outputs using an inverting boost (flyback-derived) configuration, as shown in Application Example 6 of the datasheet. With appropriate external components-including two Schottky diodes, one inductor, and resistor divider-the MIC2571-2BMM-TR delivers –12V at 2mA from a 1.5V cell. Feedback is referenced to GND, so the –VOUT equation includes diode forward drop compensation.
What is the purpose of the NC pins on MIC2571-2BMM-TR?
The MIC2571-2BMM-TR has three NC (No Connect) pins: Pin 4, Pin 7, and Pin 8. These pins are not internally bonded and serve no electrical function. They must remain unconnected-neither tied to GND nor routed-to prevent parasitic coupling, latch-up, or shifts in reference accuracy. Datasheet Figure 3 explicitly labels them as "Not internally connected" and warns against soldering or routing traces to these pads.
How does the SYNC pin affect MIC2571-2BMM-TR operation?
The SYNC pin on the MIC2571-2BMM-TR accepts a falling-edge-triggered external clock signal to reset the internal oscillator, enabling deterministic switching alignment. When unused, it must be grounded to prevent noise-induced false triggering. Unlike free-running mode, synchronized operation reduces spectral spreading of EMI, simplifying compliance testing in RF-dense environments like wireless remotes or medical telemetry devices.
What output capacitor ESR is recommended for MIC2571-2BMM-TR?
Micrel specifies ≤50mΩ ESR for output capacitors used with the MIC2571-2BMM-TR to limit ripple voltage-e.g., a 500mA peak inductor current into 200mΩ ESR yields 100mV ripple. Tantalum capacitors (e.g., Sprague 594D series, ESR ≈ 0.11Ω) are validated in application examples. Aluminum electrolytics are discouraged due to higher ESR (>200mΩ), which degrades regulation and efficiency, especially at low temperatures.
MIC2571-2BMM-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 0.9V
- Voltage - Input (Max):
- 15V
- Voltage - Output (Min/Fixed):
- 0.9V
- Voltage - Output (Max):
- 36V (Switch)
- 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
MIC2571-2BMM-TR FAQ
1.How can I place an order for MIC2571-2BMM-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2571-2BMM-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 MIC2571-2BMM-TR reliable?
The price and inventory of MIC2571-2BMM-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2571-2BMM-TR is usually 5 days.
3.What payment methods are accepted for MIC2571-2BMM-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2571-2BMM-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2571-2BMM-TR?
MIC2571-2BMM-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2571-2BMM-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 MIC2571-2BMM-TR?
For technical support, including MIC2571-2BMM-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2571-2BMM-TR requirements.
6.How does Aetrix verify that MIC2571-2BMM-TR is sourced from the original manufacturer or authorized distributors?
All MIC2571-2BMM-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 MIC2571-2BMM-TR meets industry standards.
7.What is the process for return or replacement of MIC2571-2BMM-TR?
All MIC2571-2BMM-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC2571-2BMM-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 MIC2571-2BMM-TR part is unused and in its original packaging.
Return procedure for MIC2571-2BMM-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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