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Microchip Technology MIC2570-1BM
- Part No.:
- MIC2570-1BM
- Manufacturer:
- Microchip Technology
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MIC2570-1BM.pdf
- Description:
- IC REG BST SEPIC PROG 1A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,329
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Product details
Overview
MIC2570-1BM 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 outputs of 2.85V, 3.3V, or 5V at up to 100mA, features 130µA quiescent current, 20kHz fixed switching frequency, and internal 1A current-limited NPN switch - used in glucose meters, palmtop computers, and LCD bias generators.
For engineers reviewing the MIC2570-1BM datasheet, MIC2570-1BM pinout, MIC2570-1BM application, or MIC2570-1BM equivalent, key selection criteria include input voltage range (1.3V–15V), feedback pin configuration for output selection, SOIC-8 thermal performance (θJA = 140°C/W), and synchronization capability via SYNC pin for noise-sensitive designs.
Technical Context
The MIC2570-1BM implements a gated oscillator architecture with a 0.22V internal bandgap reference and comparator-based regulation. Its NPN output switch (SW pin) operates with 67% nominal duty cycle and 35µs on-time, disabling entirely when output voltage exceeds the selected feedback threshold - enabling ultra-low quiescent current in light-load conditions.
It supports external frequency synchronization via falling-edge-triggered SYNC input and integrates internal hysteresis (65–120mV depending on output setting) to prevent oscillation near regulation points. The device uses an internal resistive divider for fixed-output versions, eliminating need for external feedback resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.3V to 15V - supports operation across full discharge curve of two AA/NiMH or single Li-ion cells. |
| Output Voltage Options | 2.85V / 3.3V / 5V - selected by connecting corresponding FB pin (2.85V, 3.3V, or 5V) directly to VOUT. |
| Quiescent Current | 130µA typical - enables multi-year battery life in low-duty-cycle portable instruments. |
| Switch Current Limit | 1.1A - protects internal NPN transistor and external inductor during startup or overload. |
| Switching Frequency | 20kHz fixed - balances efficiency, inductor size, and audible noise; synchronizable via SYNC pin. |
| Operating Temperature | –40°C to +85°C - validated for industrial and handheld medical equipment environments. |
| Package Thermal Resistance | θJA = 140°C/W - defines maximum power dissipation (400mW) in standard SOIC-8 layout. |
Pinout & Package
Package: 8-pin SOIC (M), 150 mil width, JEDEC MS-012AC compliant, with exposed pad not present. Pin 1 marked by beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | NPN collector output switch | Drives external inductor; voltage swings between VIN and ~VIN + VOUT; requires Schottky catch diode. |
| 2 (GND) | Power ground | Emitter connection of internal NPN switch; must be low-impedance return path for high di/dt currents. |
| 3 (NC) | No connect | Not internally bonded; leave unconnected and unpopulated on PCB. |
| 4 (5V) | 5V feedback input | Connects to VOUT to select 5V regulated output; internal 1.02MΩ/200kΩ divider sets 5.00V ±2.5%. |
| 5 (3.3V) | 3.3V feedback input | Connects to VOUT to select 3.3V regulated output; internal 1.02MΩ/309kΩ divider sets 3.30V ±2.5%. |
| 6 (2.85V) | 2.85V feedback input | Connects to VOUT to select 2.85V regulated output; internal 1.02MΩ/357kΩ divider sets 2.85V ±2.5%. |
| 7 (SYNC) | Oscillator sync input | Falling-edge triggered; resets oscillator phase; tie to GND if unused to prevent spurious triggering. |
| 8 (IN) | Positive supply input | Accepts 1.3V–15V; bypass with ≥100µF low-ESR capacitor close to pin for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Gated oscillator architecture | Disables switch completely when output is in regulation - reduces quiescent current to 130µA and improves light-load efficiency. |
| Selectably fixed output voltages | Three dedicated FB pins eliminate external resistor networks and trimming, simplifying BOM and layout for 2.85V/3.3V/5V systems. |
| Internal 1A current limit | Soft-limiting behavior prevents destructive inductor saturation while maintaining stable operation under transient overloads. |
| SYNC input with falling-edge trigger | Enables deterministic noise alignment in multi-regulator systems - critical for EMI-sensitive medical and instrumentation applications. |
| SOIC-8 thermal design | θJA = 140°C/W allows 400mW max power dissipation without heatsink - sufficient for ≤100mA at 5V output from 2-cell alkaline input. |
Applications
| Glucose Meters | LCD Bias Generators |
|---|---|
Use Scenario: Portable, battery-operated medical device requiring precise analog front-end biasing and microcontroller core voltage from two AA cells. IC Role / Device Role / Timing Role: Boost regulator providing stable 3.3V rail for MCU and 5V for op-amp reference buffers and sensor excitation circuits. Use Value: 130µA quiescent current extends battery life beyond 2 years in intermittent-use devices; 2.85V option powers low-voltage OLED displays directly. | Use Scenario: Small-format industrial display module needing dual-polarity bias rails (e.g., +5V and –5V) from a single 2-cell alkaline source. IC Role / Device Role / Timing Role: Primary positive boost stage generating +5V, which feeds an inverting charge-pump or transformer-based negative generator. Use Value: Fixed 5V output eliminates feedback resistor tolerance errors; 20kHz switching avoids audible noise in quiet environments. |
| Palmtop Computers | Battery Backup Supplies |
Use Scenario: Legacy handheld computing platform with tight board area (<0.6 in² available) and requirement for 3.3V logic rail from aging NiMH cells. IC Role / Device Role / Timing Role: Compact DC-DC converter delivering regulated 3.3V at up to 100mA with minimal external components (inductor, diode, two capacitors). Use Value: Complete solution fits in 0.6 in²; 67% duty cycle optimized for 3× step-up ratio ensures >75% efficiency even at 1.8V input. | Use Scenario: Industrial controller with non-volatile memory requiring clean 5V backup during main power failure, powered by coin cell or supercapacitor. IC Role / Device Role / Timing Role: Low-quiescent boost converter sustaining SRAM or RTC voltage during brownout, activated only when main supply drops below threshold. Use Value: 130µA no-load current minimizes drain on backup energy source; 1.3V start-up enables use with deeply discharged backup cells. |
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; 100mA max; 8-pin SOIC; 80µA quiescent current. | Lower EMI, smaller footprint, but limited to 2× voltage multiplication and lower efficiency at high step-up ratios. | Prefer MAX680ESA+ for space-constrained, low-noise, low-current (<50mA) 5V generation where inductor avoidance is critical. |
| TPS61022DSQR | Synchronous boost; adjustable output (0.9V–5.5V); 2A switch; 1.2MHz switching; 20-pin WQFN; 25µA quiescent current. | Higher efficiency, higher output current, and wider input range (0.3V–5.5V), but requires external feedback resistors and more complex layout. | Prefer TPS61022DSQR for new designs needing >100mA, tighter regulation, or ultra-low IQ - but verify SOIC-8 footprint compatibility is not required. |
Compared with MAX680ESA+ and TPS61022DSQR, the MIC2570-1BM offers unique value in legacy-compatible SOIC-8 packaging, fixed-output simplicity, and robust 1.3V start-up - making it optimal for cost-sensitive, medium-current, battery-powered instrumentation where design reuse and minimal BOM count are priorities.
Availability
MIC2570-1BM is available at Aetrix Electronics and suitable for glucose meters, LCD bias generators, and palmtop computers requiring stable component supply with long-term manufacturability and consistent electrical performance across temperature.
Supply support for MIC2570-1BM 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.
The MIC2570 family was developed specifically for ultra-low-power, inductor-based boost conversion in portable medical, test, and handheld instrumentation - emphasizing wide input range, selectable fixed outputs, and minimal external component count.
FAQ
What input voltage range does the MIC2570-1BM support?
The MIC2570-1BM 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 (1.8V–3.1V) and accommodates single Li-ion cells (2.5V–4.2V). Startup is guaranteed down to 1.3V, making it suitable for deeply discharged battery scenarios in portable instruments.
How do I select the output voltage on the MIC2570-1BM?
Output voltage on the MIC2570-1BM is selected by connecting exactly one of the three dedicated feedback pins - 2.85V (pin 6), 3.3V (pin 5), or 5V (pin 4) - directly to the output node (VOUT). Only one pin should be connected; others must remain floating. Each connection engages a matched internal resistor divider calibrated for ±2.5% accuracy at the respective output voltage.
Can the MIC2570-1BM synchronize to an external clock?
Yes, the MIC2570-1BM includes a SYNC pin (pin 7) that accepts a falling-edge-triggered external clock signal to synchronize its 20kHz oscillator. This feature reduces system-level EMI by correlating switching noise to a known frequency. When unused, SYNC must be tied to GND to prevent erratic operation - it is not internally pulled down.
What is the maximum continuous output current of the MIC2570-1BM?
The MIC2570-1BM supports up to 100mA continuous output current at 5V when supplied from two fresh alkaline cells (~3.0V input), assuming proper thermal management and component selection (e.g., 47µH inductor, MBRA140 Schottky diode, low-ESR capacitors). Peak switch current is limited to 1.1A, but practical output current is constrained by efficiency, thermal limits, and inductor saturation.
Does the MIC2570-1BM require external feedback resistors?
No, the MIC2570-1BM does not require external feedback resistors. It integrates precision internal resistor dividers for each fixed output option (2.85V, 3.3V, 5V). Selection is made solely by connecting the corresponding FB pin to VOUT. This eliminates resistor tolerance errors, saves board space, and reduces BOM count - a key advantage over adjustable boost controllers like the MIC2570-2BM.
MIC2570-1BM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- 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 FAQ
1.How can I place an order for MIC2570-1BM through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2570-1BM 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 reliable?
The price and inventory of MIC2570-1BM 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 is usually 5 days.
3.What payment methods are accepted for MIC2570-1BM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2570-1BM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2570-1BM?
MIC2570-1BM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2570-1BM 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?
For technical support, including MIC2570-1BM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2570-1BM requirements.
6.How does Aetrix verify that MIC2570-1BM is sourced from the original manufacturer or authorized distributors?
All MIC2570-1BM 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 meets industry standards.
7.What is the process for return or replacement of MIC2570-1BM?
All MIC2570-1BM units undergo pre-shipment inspection (PSI). If there is an issue with MIC2570-1BM, 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 part is unused and in its original packaging.
Return procedure for MIC2570-1BM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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