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Microchip Technology MIC2571-1BMM-TR
- Part No.:
- MIC2571-1BMM-TR
- Manufacturer:
- Microchip Technology
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MIC2571-1BMM-TR.pdf
- Description:
- IC REG BOOST PROG 1A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,653
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Product details
Overview
MIC2571-1BMM-TR from Micrel is a micropower single-cell boost switching regulator IC designed for low-input-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, and integrates a 1A current-limited NPN pass switch - enabling compact 0.3 in² DC-DC solutions in handheld instruments and LCD bias supplies.
For engineers reviewing the MIC2571-1BMM-TR datasheet, MIC2571-1BMM-TR pinout, MIC2571-1BMM-TR application, or MIC2571-1BMM-TR equivalent, key selection criteria include its gated-oscillator architecture, feedback-pin-selectable output voltage, SYNC input for noise reduction, MSOP-8 thermal performance (θJA = 240°C/W), and compatibility with single alkaline/NiMH/Li cells.
Technical Context
The MIC2571-1BMM-TR implements a gated-oscillator boost topology where the internal NPN switch is disabled when output voltage exceeds the feedback threshold, minimizing quiescent current. Its comparator uses a stable 0.22V bandgap reference and includes ~6mV hysteresis to prevent oscillation near regulation points.
Output voltage selection is achieved by connecting one of three dedicated feedback pins (2.85V, 3.3V, or 5V) directly to VOUT, each tied to an internal resistive divider. The SYNC pin accepts external falling-edge triggers to synchronize oscillator timing, reducing EMI in multi-rail systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 0.9V to 15V - supports operation across full discharge curve of single alkaline, NiMH, or lithium cells. |
| Output Voltage Options | 2.85V / 3.3V / 5V - selected externally via dedicated feedback pins; no external resistor network required. |
| Quiescent Current | 120µA typical - enables >1-year battery life in low-duty-cycle portable devices like remote controls and detectors. |
| Switching Frequency | 20kHz fixed - balances inductor size, efficiency, and audible noise; synchronizable via SYNC pin. |
| Current Limit | 1.1A - protects internal NPN switch and external inductor during overload or short-circuit conditions. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and consumer handheld environments without derating. |
| Package | 8-lead MSOP (MM) - 3mm × 3mm footprint with exposed pad thermal path; θJA = 240°C/W. |
Pinout & Package
Package: 8-lead MSOP (MM), 3.0mm × 3.0mm body, 0.65mm pitch, exposed thermal pad (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SW | Switch Collector | NPN transistor collector node; connects to inductor and flyback diode anode - carries peak switching current up to 1.1A. |
| 2 - GND | Power Ground | Emiter connection of internal NPN switch; primary return path for switch current and IC ground reference. |
| 3 - NC | No Connect | Not internally bonded; must be left floating or grounded per layout best practices to avoid parasitic coupling. |
| 4 - 5V | 5V Feedback Input | Connects to VOUT to select 5V regulated output; ties to internal 2.85kΩ/1.15kΩ divider yielding 5.00V ±1.5% at 100mA load. |
| 5 - 3.3V | 3.3V Feedback Input | Connects to VOUT to select 3.3V regulated output; ties to internal 1.82kΩ/1.15kΩ divider yielding 3.30V ±1.5% at 100mA load. |
| 6 - 2.85V | 2.85V Feedback Input | Connects to VOUT to select 2.85V regulated output; ties to internal 1.5kΩ/1.15kΩ divider yielding 2.85V ±1.5% at 100mA load. |
| 7 - SYNC | Synchronization Input | Falling-edge-triggered oscillator reset; enables EMI reduction by locking switching frequency to system clock or audio band. |
| 8 - IN | Supply Input | Positive input rail connection; accepts 0.9V–15V; internal UVLO ensures startup only above ~0.9V with 100mA load capability. |
Key Features
| Feature | Design Value |
|---|---|
| Gated-oscillator architecture | Disables switch when output is in regulation - reduces quiescent current to 120µA and improves light-load efficiency. |
| Three-pin-selectable output | Eliminates external feedback resistors for 2.85V/3.3V/5V outputs - simplifies BOM and layout while ensuring tight tolerance (±1.5%). |
| SYNC input with falling-edge trigger | Enables deterministic EMI control in multi-converter systems - avoids beat frequencies and allows alignment with audio or communication clocks. |
| 1.1A internal current limit | Soft-limiting behavior prevents abrupt shutdown - maintains regulation under transient overloads and protects external magnetics. |
| 0.3 in² solution size | Requires only four external components (inductor, diode, input/output caps) - fits space-constrained PCBs in pagers and palmtop computers. |
Applications
| Handheld Instrument Power | LCD Bias Generation |
|---|---|
|
Use Scenario: Portable multimeter or gas detector powered by a single AA/AAA alkaline cell with intermittent measurement cycles. IC Role / Device Role / Timing Role: Boost regulator providing stable 3.3V rail for microcontroller and sensor interface circuitry. Use Value: 120µA quiescent current extends battery life beyond 2 years in standby; 20kHz switching avoids audible noise in sensitive analog front-ends. |
Use Scenario: Monochrome or segment LCD display in remote control or thermostat requiring positive bias voltage. IC Role / Device Role / Timing Role: Generates 5V bias from 1.5V cell to drive LCD segment backplane and common electrodes. Use Value: Pin-selectable 5V output eliminates trimming resistors; 0.3 in² footprint enables integration into narrow bezel designs. |
| Pager Supply Management | Battery Backup System |
|
Use Scenario: Two-way pager operating on single NiMH cell with burst transmission and long idle periods. IC Role / Device Role / Timing Role: Provides regulated 2.85V supply for RF transceiver and baseband ASIC during active transmit/receive windows. Use Value: Gated-oscillator operation minimizes average current draw during receive standby - critical for meeting 72-hour standby spec. |
Use Scenario: Real-time clock (RTC) backup circuit maintaining SRAM or timekeeping during main power failure. IC Role / Device Role / Timing Role: Boosts depleted 1.0V–1.2V coin cell to 3.3V to sustain RTC and memory retention. Use Value: Guaranteed startup down to 0.9V input enables full utilization of battery capacity; 85°C rating supports wide ambient deployment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX756CPA+ | Fixed 5V/3.3V output; 100kHz switching; higher quiescent current (150µA); SO-8 package. | Larger solution size due to higher frequency inductor; less suitable for ultra-low-noise or space-constrained designs. | Prefer MAX756CPA+ only if 100kHz operation is required for smaller inductors and board area is not constrained. |
| TPS61200DRCR | Adjustable output (1.8V–5.5V); 500kHz switching; 100µA quiescent current; 1.2A switch; 10-pin WSON. | Requires external feedback resistors; higher frequency increases EMI risk but enables smaller passive components. | Choose TPS61200DRCR when adjustable output and lower quiescent current are prioritized over pin-select simplicity and MSOP-8 compatibility. |
Compared with MIC2571-1BMM-TR, MAX756CPA+ trades lower solution size for higher EMI and reduced battery life, while TPS61200DRCR offers greater flexibility at the cost of added BOM complexity and different thermal characteristics - making MIC2571-1BMM-TR optimal for fixed-output, low-noise, space-sensitive single-cell applications.
Availability
MIC2571-1BMM-TR is available at Aetrix Electronics and suitable for handheld instruments, LCD bias generation, pagers, remote controls, and battery backup supplies requiring stable component supply across extended product lifecycles.
Supply support for MIC2571-1BMM-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 semiconductor company specializing in analog, power management, and timing solutions before its acquisition by Microchip Technology in 2015. Known for high-reliability, low-power ICs targeting portable and industrial markets.
The MIC2571 family was designed specifically for ultra-low-voltage, single-cell boost conversion in battery-powered consumer and instrumentation products - emphasizing minimal quiescent current, small solution size, and robust start-up behavior down to 0.9V.
FAQ
What input voltage range does the MIC2571-1BMM-TR support?
The MIC2571-1BMM-TR supports an input voltage range of 0.9V to 15V, enabling reliable operation across the full discharge curve of single alkaline, NiMH, or lithium primary cells. Startup is guaranteed at 0.9V with 100mA load, and absolute maximum input is 18V per Absolute Maximum Ratings. This wide range makes MIC2571-1BMM-TR ideal for applications where battery voltage varies significantly during use.
How is the output voltage selected on the MIC2571-1BMM-TR?
The MIC2571-1BMM-TR provides three fixed output voltages - 2.85V, 3.3V, and 5V - selected by connecting the corresponding feedback pin (pin 6, 5, or 4) directly to the output node. Each pin connects to a precision internal resistor divider referenced to a 0.22V bandgap, ensuring ±1.5% accuracy at 100mA load. No external resistors are needed, simplifying design and improving reliability compared to adjustable regulators.
Does the MIC2571-1BMM-TR require an external synchronization signal to operate?
No, the MIC2571-1BMM-TR operates autonomously with a fixed 20kHz oscillator and does not require an external SYNC signal. The SYNC pin (pin 7) is optional and used only to reduce EMI by aligning switching edges with a system clock or audio frame. When unused, SYNC must be grounded to prevent spurious triggering - leaving MIC2571-1BMM-TR fully functional in standalone boost configurations.
What is the purpose of the NC pin (pin 3) on the MIC2571-1BMM-TR?
Pin 3 on the MIC2571-1BMM-TR is designated NC (No Connect) and is not internally bonded. It must remain unconnected in the circuit - neither tied to GND nor routed - to avoid unintended coupling or leakage paths. While grounding pin 3 poses no immediate damage, best practice per Micrel's layout guidance is to leave it floating or remove copper underneath to maintain signal integrity in noise-sensitive applications using MIC2571-1BMM-TR.
Can the MIC2571-1BMM-TR drive a 5V/5mA load from a 1.2V alkaline cell?
Yes, the MIC2571-1BMM-TR is explicitly validated for 5V/5mA operation from 1.0V–1.5V single-cell inputs, as shown in Application Example 1 of the datasheet. With 1.2V input, the device achieves >70% efficiency using a 150µH inductor and MBR0530 Schottky diode. The 1.1A current limit and gated-oscillator architecture ensure stable regulation even under varying battery voltage - confirming MIC2571-1BMM-TR's suitability for this exact use case.
MIC2571-1BMM-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:
- 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
MIC2571-1BMM-TR FAQ
1.How can I place an order for MIC2571-1BMM-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2571-1BMM-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 MIC2571-1BMM-TR reliable?
The price and inventory of MIC2571-1BMM-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2571-1BMM-TR is usually 5 days.
3.What payment methods are accepted for MIC2571-1BMM-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2571-1BMM-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2571-1BMM-TR?
MIC2571-1BMM-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2571-1BMM-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 MIC2571-1BMM-TR?
For technical support, including MIC2571-1BMM-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2571-1BMM-TR requirements.
6.How does Aetrix verify that MIC2571-1BMM-TR is sourced from the original manufacturer or authorized distributors?
All MIC2571-1BMM-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 MIC2571-1BMM-TR meets industry standards.
7.What is the process for return or replacement of MIC2571-1BMM-TR?
All MIC2571-1BMM-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC2571-1BMM-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 MIC2571-1BMM-TR part is unused and in its original packaging.
Return procedure for MIC2571-1BMM-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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