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Microchip Technology MIC2570-1BM-TR
- Part No.:
- MIC2570-1BM-TR
- Manufacturer:
- Microchip Technology
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MIC2570-1BM-TR.pdf
- Description:
- IC REG BST SEPIC PROG 1A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,713
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Product details
Overview
MIC2570-1BM-TR from Micrel is a micropower boost switching regulator IC designed for battery-powered systems operating from two alkaline or NiMH cells (1.3V–3.1V) or one Li-ion cell. It delivers selectable fixed 2.85V/3.3V/5V output at up to 100mA, features 130µA quiescent current, 20kHz fixed-frequency operation with SYNC input, and integrates an NPN pass switch with 1.1A current limit in an 8-pin SOIC package.
For engineers reviewing the MIC2570-1BM-TR datasheet, MIC2570-1BM-TR pinout, MIC2570-1BM-TR application, or MIC2570-1BM-TR equivalent, key selection criteria include input voltage range (1.3V–15V), feedback pin configuration for output selection, thermal performance in SOIC-8, and compatibility with low-ESR tantalum output capacitors in space-constrained portable designs.
Technical Context
The MIC2570-1BM-TR employs a gated oscillator architecture with a 0.22V internal reference and comparator-based regulation. Its NPN switch operates in discontinuous conduction mode, disabling entirely when output voltage exceeds the feedback threshold-enabling ultra-low quiescent current and high light-load efficiency.
It supports external frequency synchronization via the SYNC pin (triggered by falling edge), allows output voltage selection via dedicated 2.85V/3.3V/5V feedback pins, and incorporates built-in 6mV comparator hysteresis to prevent oscillation near regulation thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.3V to 15V - supports wide battery discharge curves including two AA/NiMH (2.0V–3.1V) and single Li-ion (2.5V–4.2V). |
| Output Voltage Options | 2.85V / 3.3V / 5V - selected externally by connecting corresponding FB pin to VOUT; no resistor network required. |
| Quiescent Current | 130µA typical - enables >1-year battery life in low-duty-cycle handheld instruments. |
| Switching Frequency | 20kHz fixed - avoids audible noise while enabling compact magnetics; synchronizable via SYNC pin. |
| Current Limit | 1.1A - protects internal NPN switch and external inductor during startup or overload without external sensing. |
| Package | 8-pin SOIC (M) - industry-standard footprint with θJA = 140°C/W; compatible with standard reflow and wave soldering. |
| Operating Temperature | –40°C to +85°C - validated for industrial and consumer portable equipment environments. |
Pinout & Package
Package: 8-pin SOIC (M), 3.99mm × 4.90mm body, 1.27mm pitch, exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Switch Collector | NPN transistor collector node - connects to inductor and diode anode; switches at 20kHz to store/release energy. |
| 2 (GND) | Power Ground | Emiter connection of internal NPN switch - must be low-impedance return path for switch current and IC ground. |
| 3 (NC) | No Connect | Not internally bonded - leave unconnected; no pull-up/down or routing required. |
| 4 (5V) | 5V Feedback Input | Connects to VOUT to select 5V output; internal 1.02MΩ/200kΩ divider sets 5.00V ±2.5% regulation point. |
| 5 (3.3V) | 3.3V Feedback Input | Connects to VOUT to select 3.3V output; internal 1.02MΩ/300kΩ divider sets 3.30V ±2.5% regulation point. |
| 6 (2.85V) | 2.85V Feedback Input | Connects to VOUT to select 2.85V output; internal 1.02MΩ/350kΩ divider sets 2.85V ±2.5% regulation point. |
| 7 (SYNC) | Synchronization Input | Falling-edge triggered - resets oscillator to align switching with external clock and reduce EMI coupling. |
| 8 (IN) | Supply Input | Positive input rail - accepts 1.3V–15V; bypass with ≥100µF low-ESR capacitor close to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 130µA enables multi-year battery life in glucose meters and remote controls with infrequent wake-ups. |
| Selectably fixed output voltages | 2.85V/3.3V/5V options eliminate external resistors and trimming - reduces BOM count and layout complexity. |
| Gated oscillator architecture | Disables switch entirely when output is in regulation - eliminates switching losses and improves light-load efficiency >90%. |
| Internal 1.1A current limit | Soft-limiting behavior prevents inductor saturation and switch damage during cold-start or short-circuit conditions. |
| SYNC input with falling-edge trigger | Enables deterministic EMI placement in systems with master clocks - critical for EMC compliance in medical and industrial devices. |
Applications
| Glucose Meters | LCD Bias Generators |
|---|---|
Use Scenario: Portable, battery-operated medical device requiring stable 3.3V rail for microcontroller and sensor interface, with <100µA sleep current. IC Role / Device Role / Timing Role: Primary DC-DC boost regulator converting two AA cells (2.0V–3.1V) to regulated 3.3V output. Use Value: 130µA quiescent current extends battery life beyond 2 years; 3.3V FB pin eliminates external resistors and calibration drift. | Use Scenario: Small-form-factor display module needing dual-polarity bias (e.g., +5V and –5V) from a single 2-cell alkaline source. IC Role / Device Role / Timing Role: Positive boost stage in charge-pump-derived bipolar supply - generates +5V rail for LCD driver ICs. Use Value: Fixed 5V output ensures consistent contrast control; 20kHz switching avoids audible noise in quiet clinical environments. |
| Palmtop Computers | Battery Backup Supplies |
Use Scenario: Legacy handheld computing device with tight PCB area (<0.6 in² available) and requirement for 5V logic rail from two NiMH cells. IC Role / Device Role / Timing Role: Compact, self-contained boost converter - only requires inductor, diode, and two capacitors. Use Value: Complete solution fits 0.6 in² footprint; 8-pin SOIC simplifies assembly and rework versus QFN alternatives. | Use Scenario: Industrial controller with non-volatile memory requiring clean 5V backup during main power failure, powered by coin cell or supercap. IC Role / Device Role / Timing Role: Low-quiescent boost regulator sustaining SRAM or RTC voltage during brownout events. Use Value: 1.3V start-up capability enables operation down to depleted coin cell voltage; 5V FB pin guarantees precise retention voltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61200DRCT | Adjustable output (0.9V–5.5V); 1.2MHz switching; 1.5A switch; 55µA IQ; 6-pin WSON. | Higher frequency enables smaller inductors but increases EMI filtering burden; no fixed-output variants. | Prefer for space-constrained designs needing higher output current or adjustable voltage; avoid if fixed 5V/3.3V simplicity is prioritized. |
| MAX680ESA+ | Charge-pump doubler (no inductor); 5V out; 100mA; 125µA IQ; 8-pin SOIC; no SYNC or selectable outputs. | Inductorless design reduces size but limits max output current and efficiency at >2× VIN; no negative rail support. | Prefer for ultra-low-noise, low-current applications where inductor EMI or cost is prohibitive; avoid for >100mA or wide-VIN needs. |
Compared with TPS61200DRCT and MAX680ESA+, the MIC2570-1BM-TR uniquely combines fixed-output selection, 20kHz EMI-friendly switching, and 130µA quiescent current in a legacy-compatible SOIC-8 - making it optimal for cost-sensitive, low-noise, battery-life-critical designs where layout simplicity matters more than peak efficiency or miniaturization.
Availability
MIC2570-1BM-TR is available at Aetrix Electronics and suitable for glucose meters, LCD bias generators, palmtop computers, battery backup supplies, and remote controls requiring stable component supply across long-lifecycle industrial and medical programs.
Supply support for MIC2570-1BM-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 acquired by Microchip Technology in 2015, known for high-reliability power management and interface ICs.
The MIC2570 product line was engineered specifically for ultra-low-power, battery-fed portable instrumentation - emphasizing minimal external components, robust start-up under weak battery conditions, and predictable thermal behavior in sealed enclosures.
FAQ
What input voltage range does the MIC2570-1BM-TR support?
The MIC2570-1BM-TR supports an input voltage range of 1.3V to 15V. This enables reliable operation across the full discharge curve of two alkaline or NiMH cells (2.0V–3.1V) and single Li-ion cells (2.5V–4.2V). Startup is guaranteed down to 1.3V with 100mA load, making MIC2570-1BM-TR suitable for deeply discharged battery scenarios in handheld instruments.
How do I select the output voltage on the MIC2570-1BM-TR?
Output voltage on the MIC2570-1BM-TR is selected by connecting the desired feedback pin (2.85V, 3.3V, or 5V) directly to the output node. Only one feedback pin should be connected per design; the others remain unconnected. The internal resistor dividers ensure 2.85V ±5%, 3.30V ±2.5%, or 5.00V ±2.5% regulation without external components - a key advantage of MIC2570-1BM-TR over adjustable boost controllers.
Does the MIC2570-1BM-TR require an external compensation network?
No, the MIC2570-1BM-TR does not require external compensation. Its gated oscillator architecture and internal feedback loop are fully compensated for stability with standard external components: a 47µH inductor, Schottky diode (e.g., MBRA140), and low-ESR output capacitor (≥220µF, ≤100mΩ). This simplifies design validation and eliminates tuning effort - a core benefit of MIC2570-1BM-TR in time-sensitive development cycles.
Can the MIC2570-1BM-TR drive a 100mA load at 5V from two AA cells?
Yes, the MIC2570-1BM-TR can reliably deliver 100mA at 5V from two fresh AA cells (3.0V nominal). At 2.0V input, efficiency drops to ~75% but output regulation holds within specification. Example 1 in the datasheet confirms this capability using a 47µH inductor and 220µF tantalum output capacitor - validating MIC2570-1BM-TR for high-current portable applications like palmtop computers.
Is the SYNC pin required for basic operation of the MIC2570-1BM-TR?
No, the SYNC pin is optional. When unused, it must be grounded to prevent spurious triggering. The MIC2570-1BM-TR operates autonomously at its internal 20kHz frequency without external clocking. SYNC is only needed to align switching edges with system clocks for EMI reduction - a secondary feature that does not affect core functionality of MIC2570-1BM-TR.
MIC2570-1BM-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Boost, SEPIC
- Output Type:
- Programmable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.3V
- 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-SOIC
MIC2570-1BM-TR FAQ
1.How can I place an order for MIC2570-1BM-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2570-1BM-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 MIC2570-1BM-TR reliable?
The price and inventory of MIC2570-1BM-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2570-1BM-TR is usually 5 days.
3.What payment methods are accepted for MIC2570-1BM-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2570-1BM-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2570-1BM-TR?
MIC2570-1BM-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2570-1BM-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 MIC2570-1BM-TR?
For technical support, including MIC2570-1BM-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2570-1BM-TR requirements.
6.How does Aetrix verify that MIC2570-1BM-TR is sourced from the original manufacturer or authorized distributors?
All MIC2570-1BM-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 MIC2570-1BM-TR meets industry standards.
7.What is the process for return or replacement of MIC2570-1BM-TR?
All MIC2570-1BM-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC2570-1BM-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 MIC2570-1BM-TR part is unused and in its original packaging.
Return procedure for MIC2570-1BM-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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