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Microchip Technology MIC2570-1YM
- Part No.:
- MIC2570-1YM
- Manufacturer:
- Microchip Technology
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MIC2570-1YM.pdf
- Description:
- IC REG BST SEPIC PROG 1A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:190
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Product details
Overview
MIC2570-1YM from Micrel is a micropower boost switching regulator IC designed for battery-powered systems, operating from 1.3V to 15V input (e.g., two alkaline or NiMH cells), delivering selectable 2.85V/3.3V/5V outputs with 130µA typical quiescent current, 20kHz fixed switching frequency, and integrated 1A current-limited NPN switch - used in glucose meters, palmtop computers, and LCD bias generators.
For engineers reviewing the MIC2570-1YM datasheet, MIC2570-1YM pinout, MIC2570-1YM application, or MIC2570-1YM equivalent, key selection criteria include input voltage range (1.3–15V), output voltage configurability via feedback pins, SOIC-8 thermal performance (θJA = 140°C/W), and synchronization capability via SYNC pin for EMI control.
Technical Context
The MIC2570-1YM implements a gated oscillator architecture with a 0.22V internal bandgap reference and comparator-based feedback control. Its NPN output switch enables discontinuous conduction mode operation, minimizing quiescent current by disabling switching when output voltage exceeds regulation threshold.
It features built-in 6mV comparator hysteresis and delivers up to 120mV output hysteresis at 5V due to feedback divider gain. The 20kHz oscillator is synchronized externally via falling-edge-triggered SYNC pin, supporting noise-sensitive applications requiring correlated switching timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.3V to 15V - supports wide battery discharge curves including two-cell alkaline (2.0–3.1V) and single Li-ion (2.5–4.2V). |
| Output Voltage Options | 2.85V / 3.3V / 5V - selected by connecting corresponding feedback pin (2.85V, 3.3V, or 5V) directly to VOUT. |
| Quiescent Current | 130µA typical - enables >1-year battery life in low-duty-cycle portable instruments like glucose meters. |
| Switch Current Limit | 1.1A - protects internal NPN transistor and external inductor during overload or short-circuit conditions. |
| Switching Frequency | 20kHz fixed - balances efficiency and inductor size; synchronizable to external clock for EMI reduction. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and medical handheld equipment environments. |
| Package | 8-pin SOIC (M) - surface-mount compatible with standard reflow profiles; θJA = 140°C/W. |
Pinout & Package
Package: 8-pin SOIC (M), 3.99mm × 4.90mm body, 1.27mm pitch, JEDEC MS-012AC compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | NPN collector output | Drives external inductor; voltage swings between VIN and ~VIN + VOUT; requires Schottky catch diode. |
| GND | Power ground | Emitter connection of internal NPN switch; must be low-impedance return path for high di/dt currents. |
| NC | No internal connection | Pin 3 is unconnected - leave floating or tie to GND per layout best practices; no electrical function. |
| 5V | Fixed 5V feedback input | Connects to VOUT to configure 5V output; internal 4.75–5.25V regulation window at 100mA load. |
| IN | Positive supply input | Accepts 1.3–15V; includes overvoltage protection to 18V absolute max; bypass capacitor required. |
| SYNC | Oscillator sync input | Falling-edge triggered; resets oscillator one-shot; ground when unused to prevent spurious triggering. |
| 3.3V | Fixed 3.3V feedback input | Connects to VOUT to configure 3.3V output; regulated to 3.14–3.47V at 100mA load. |
| 2.85V | Fixed 2.85V feedback input | Connects to VOUT to configure 2.85V output; regulated to 2.7–3.0V at 100mA load. |
Key Features
| Feature | Design Value |
|---|---|
| Gated oscillator architecture | Disables switching when output is in regulation - reduces quiescent current to 130µA and improves light-load efficiency. |
| Selectably fixed output voltages | Three dedicated feedback pins (2.85V/3.3V/5V) eliminate external resistor networks and trim errors in space-constrained designs. |
| Internal 1A current-limited NPN switch | Integrates power switch with soft current limiting - avoids need for external sense resistors or protection circuitry. |
| SYNC input for external clock correlation | Enables deterministic EMI placement by locking switching edges to system clock - critical for EMC-compliant medical devices. |
| Wide 1.3V minimum input operation | Starts regulation even at near-dead battery voltage (e.g., 1.3V from two exhausted alkaline cells), extending usable battery life. |
Applications
| Glucose Meters | LCD Bias Generators |
|---|---|
Use Scenario: Portable, battery-operated medical device requiring stable 3.3V or 5V rail from two AA cells across full discharge range (3.1V → 2.0V). IC Role / Device Role / Timing Role: Primary DC-DC boost regulator providing regulated output for microcontroller, sensor interface, and display driver. Use Value: 130µA quiescent current extends battery life beyond 1 year; selectable outputs simplify BOM across multiple product variants. | Use Scenario: Generating ±5V rails for LCD segment drivers in handheld test equipment powered by two alkaline cells. IC Role / Device Role / Timing Role: Positive boost stage in charge-pump-assisted bipolar supply; SW pin drives inductor for +5V, while inverted topology generates –5V. Use Value: Fixed 5V output eliminates feedback resistor tolerance drift; 20kHz frequency allows compact 47µH inductor and <0.6 in² total PCB area. |
| Palmtop Computers | Battery Backup Supplies |
Use Scenario: Main 3.3V system rail generation from single Li-ion cell (2.5–4.2V) in ultra-thin computing devices. IC Role / Device Role / Timing Role: High-efficiency step-up converter feeding PMIC or directly powering SoC I/O domain. Use Value: 1.3V startup ensures operation down to deeply discharged battery; SOIC-8 package enables automated assembly and thermal management. | Use Scenario: Maintaining real-time clock (RTC) and SRAM retention during main power loss in industrial controllers using two-cell backup. IC Role / Device Role / Timing Role: Low-quiescent boost regulator sustaining 3.3V or 5V from depleted backup batteries (≤1.8V). Use Value: 130µA IQ minimizes self-discharge; gated oscillator prevents unnecessary switching until VOUT droops below regulation threshold. |
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 required; fixed ±5V dual output; 100kHz switching; 100µA IQ. | Not suitable for >100mA loads or adjustable output; limited to dual-rail generation without external components. | Prefer MAX680ESA+ only for low-current, dual-rail, inductorless designs where footprint is paramount. |
| TPS61022DSQR | Synchronous boost; 2.5–5.5V input; 3.3V/5V selectable; 2.2MHz switching; 22µA IQ; integrated MOSFETs. | Higher efficiency above 100mA; supports lower input voltage but not sub-1.8V; requires different compensation network. | Choose TPS61022DSQR for higher efficiency and smaller solution size in new designs with ≥2.5V min input. |
Compared with MAX680ESA+ and TPS61022DSQR, the MIC2570-1YM uniquely supports 1.3V startup and delivers 1A peak switch current in SOIC-8 - making it irreplaceable for deep-discharge two-cell alkaline/NiMH applications requiring robust, low-cost boost conversion without synchronous complexity.
Availability
MIC2570-1YM is available at Aetrix Electronics and suitable for glucose meters, LCD bias generators, and palmtop computers requiring stable component supply, long-term manufacturability, and industrial temperature support.
Supply support for MIC2570-1YM 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, timing, and interface solutions.
The MIC2570 product line was engineered specifically for ultra-low-power, wide-input-voltage boost conversion in portable medical, instrumentation, and battery-backed systems - emphasizing simplicity, reliability, and minimal external component count.
FAQ
What input voltage range does the MIC2570-1YM support, and why is this important for battery-powered designs?
The MIC2570-1YM supports an input voltage range of 1.3V to 15V. This wide range enables reliable operation across the full discharge curve of two alkaline or NiMH cells (typically 3.1V down to ~1.3V per cell), ensuring continuous regulation even as batteries deplete - a critical feature for long-life portable devices like glucose meters where premature shutdown must be avoided. The 1.3V minimum startup voltage is confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables.
How is the output voltage selected on the MIC2570-1YM, and what are the tolerance bands for each option?
The MIC2570-1YM provides three fixed output voltages - 2.85V, 3.3V, and 5V - selected by connecting the corresponding feedback pin (2.85V, 3.3V, or 5V) directly to the output node. Per the Electrical Characteristics table, the 5V option is regulated to 4.75–5.25V (±5%), the 3.3V option to 3.14–3.47V (±4.4%), and the 2.85V option to 2.7–3.0V (±5.3%) at 100mA load and 25°C ambient.
Does the MIC2570-1YM require an external diode, and if so, what type is recommended?
Yes, the MIC2570-1YM requires an external Schottky diode connected between the SW pin and output capacitor. The datasheet explicitly recommends Schottky diodes such as the MBRA140 due to their low forward voltage (reducing conduction loss) and fast recovery (minimizing switching loss). Standard silicon rectifiers like the 1N400x series are discouraged because their higher VF and slow recovery degrade efficiency and thermal performance.
What is the purpose of the SYNC pin on the MIC2570-1YM, and how should it be handled if not used?
The SYNC pin on the MIC2570-1YM accepts an external falling-edge clock signal to synchronize the internal 20kHz oscillator - enabling deterministic EMI placement in noise-sensitive systems. If unused, the datasheet mandates grounding the SYNC pin to prevent spurious triggering; leaving it floating may cause erratic switching behavior or increased EMI due to noise coupling.
Can the MIC2570-1YM be used to generate negative output voltages, and what application example supports this?
Yes, the MIC2570-1YM can generate negative outputs using an inverting boost (flyback-derived) topology. Example 7 in the datasheet demonstrates a ±5V/50mA regulator where the MIC2570-1YM generates +5V, and a second inductor-diode-capacitor stage referenced to ground produces –5V. This configuration leverages the IC's robust 1A switch and low IQ to sustain dual-rail supplies in handheld test equipment and portable instrumentation.
MIC2570-1YM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- 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
MIC2570-1YM FAQ
1.How can I place an order for MIC2570-1YM through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2570-1YM 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 MIC2570-1YM reliable?
The price and inventory of MIC2570-1YM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2570-1YM is usually 5 days.
3.What payment methods are accepted for MIC2570-1YM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2570-1YM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2570-1YM?
MIC2570-1YM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2570-1YM 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 MIC2570-1YM?
For technical support, including MIC2570-1YM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2570-1YM requirements.
6.How does Aetrix verify that MIC2570-1YM is sourced from the original manufacturer or authorized distributors?
All MIC2570-1YM 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 MIC2570-1YM meets industry standards.
7.What is the process for return or replacement of MIC2570-1YM?
All MIC2570-1YM units undergo pre-shipment inspection (PSI). If there is an issue with MIC2570-1YM, 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 MIC2570-1YM part is unused and in its original packaging.
Return procedure for MIC2570-1YM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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