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Microchip Technology MIC2179BSM
- Part No.:
- MIC2179BSM
- Manufacturer:
- Microchip Technology
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MIC2179BSM.pdf
- Description:
- IC REG BUCK ADJ 1.5A 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,084
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Product details
Overview
MIC2179BSM from Microchip Technology is a 200 kHz synchronous buck (step-down) DC/DC regulator with internal 150 mΩ high-side P-channel and low-side N-channel MOSFETs, supporting 4.5V–16.5V input and delivering up to 1.5A output current. It operates in dual-mode (PWM or skip) for efficiency up to 96%, features 100% duty cycle for low-dropout operation, and includes current-mode control, thermal shutdown, and undervoltage lockout - ideal for battery-powered portable electronics requiring stable, efficient voltage conversion.
For engineers reviewing the MIC2179BSM datasheet, MIC2179BSM pinout, MIC2179BSM application, or MIC2179BSM equivalent, key selection criteria include its 200 kHz fixed switching frequency, dual-mode efficiency optimization below/above 150 mA, 1.245 V feedback reference, 20-lead SSOP package, and integrated power stage enabling compact, high-efficiency buck designs without external MOSFETs.
Technical Context
The MIC2179BSM implements current-mode control with internal current sensing and slope compensation, enabling stable loop compensation and superior line regulation. Its half-H-bridge switch output integrates complementary P- and N-channel MOSFETs with anti-shoot-through logic and 150 mΩ on-resistance at 12V.
Dual-mode operation is externally selected via the PWM pin: logic low enables constant-frequency PWM mode (≥150 mA), while logic high activates self-oscillating skip mode (<150 mA) with 10 mV hysteresis on the feedback comparator and 300 mA max load capability. The 200 kHz oscillator supports synchronization to external clocks up to 300 kHz via the SYNC pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +4.5V to +16.5V - supports wide-input battery and industrial rails without pre-regulation |
| Output Current | Up to 1.5A - sufficient for core logic, memory, and peripheral rails in portable systems |
| Switching Frequency | 200 kHz preset - balances EMI, inductor size, and efficiency; synchronizable to 220–300 kHz |
| Feedback Reference | 1.245 V ±25 mV - enables precise adjustable output via resistor divider (e.g., 3.3V or 5.0V) |
| Quiescent Current | 1.0 mA (PWM), 600 µA (skip), <5 µA (shutdown) - extends battery life in standby and light-load states |
| Duty Cycle Range | 0–100% - maintains regulation down to VIN–VOUT <1 V, critical for low-dropout battery operation |
| Current Limit | 4.3 A (PWM), 600 mA (skip) - provides pulse-by-pulse overcurrent protection without external sensing |
| Thermal Shutdown | Activates above +125°C junction - protects device during overload or poor heatsinking |
Pinout & Package
The MIC2179BSM is housed in a 20-lead SSOP (Shrink Small Outline Package) with exposed thermal pad, rated for –40°C to +85°C ambient operation. Pin 1 is marked by a dot; pins 1, 2, 19, and 20 are PGND; pins 9–12 are SGND; pins 16 and 17 are VIN; pins 4 and 18 are NC (not connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 19, 20 | PGND | Power ground - must connect all four to a low-impedance central ground point for switch return path |
| 3 | SW | Switch node - connects to inductor and output diode; carries high dI/dt switching current |
| 4, 18 | NC | No internal connection - leave unconnected; no routing or copper required |
| 5 | PWM | Mode select input - logic low = PWM mode; logic high = skip mode; must not float |
| 6 | PWRGD | Open-drain power-good flag - active-low when FB drops >10% below 1.245 V; requires external pull-up |
| 7 | FB | Feedback input - connects to resistor divider; senses output voltage for regulation |
| 8 | COMP | Error amplifier output - connects to RC compensation network for loop stability |
| 9–12 | SGND | Signal ground - ties analog circuitry (FB, COMP, BIAS) to clean ground separate from power return |
| 13 | SYNC | External clock sync input - rising edge resets oscillator; connect to SGND if unused |
| 14 | BIAS | Internal 3.3 V bias supply - bypass with 0.01 µF capacitor to SGND; no external load permitted |
| 15 | EN | Enable input - logic high enables regulator; logic low reduces quiescent current to <5 µA |
| 16, 17 | VIN | Main input supply - both pins must be connected to input rail with local 10 µF + 0.1 µF bypass |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode efficiency optimization | Automatically selects PWM (>150 mA) or skip (<150 mA) mode to maintain ≥96% peak efficiency across full load range |
| Integrated synchronous power stage | 150 mΩ high-side P-MOSFET and low-side N-MOSFET eliminate need for external switches and reduce board area |
| 100% duty cycle operation | Enables dropout as low as ILOAD × RON(HS), supporting regulation even when VIN approaches VOUT |
| Current-mode control with slope compensation | Simplifies loop compensation, improves line regulation, and prevents subharmonic oscillation at >50% duty cycle |
| Comprehensive protection suite | Includes pulse-by-pulse current limit, thermal shutdown, undervoltage lockout (4.25 V turn-on), and shutdown mode (<5 µA IQ) |
| Adjustable output voltage | Programmable from 1.25 V to 16.5 V using external resistor divider referenced to 1.245 V internal bandgap |
Applications
| Laptop Power Management | Cellular Phone Baseband Supply |
|---|---|
Use Scenario: Regulating main system voltage (e.g., 3.3 V or 5.0 V) from Li-ion battery (3.0–4.2 V nominal) or adapter input (5–16.5 V). IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing stable, high-efficiency core voltage with dynamic mode switching. Use Value: Dual-mode operation extends battery runtime by reducing quiescent current to 600 µA in skip mode during idle/sleep states. | Use Scenario: Powering baseband processor, RF transceiver, or audio codec in GSM/UMTS/LTE handsets. IC Role / Device Role / Timing Role: Low-noise, high-efficiency step-down converter with programmable output and fast transient response. Use Value: Skip mode minimizes switching noise during voice calls or audio playback, avoiding interference with sensitive analog circuits. |
| Handheld Instrument Core Rail | Battery Charger Auxiliary Supply |
Use Scenario: Generating regulated 3.3 V for microcontroller, ADC, and sensor interface in portable test equipment. IC Role / Device Role / Timing Role: Main DC/DC converter with thermal and current protection for rugged, field-deployable devices. Use Value: 100% duty cycle ensures uninterrupted operation as battery discharges below 4.5 V, maintaining VOUT until end-of-life. | Use Scenario: Providing isolated auxiliary 3.3 V or 5.0 V rail for charger controller IC, display, or USB interface in multi-cell Li-ion chargers. IC Role / Device Role / Timing Role: Secondary buck regulator powered from high-voltage charger input (e.g., 12–16.5 V). Use Value: Internal 150 mΩ MOSFETs and 200 kHz switching enable compact, low-BOM-cost design without discrete FETs or gate drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2315DJ-LF-Z | 3.3–18 V input, 2 A output, 500 kHz switching, no skip mode, different pinout | Higher current and frequency but lacks light-load efficiency optimization and mode-select flexibility | Select MP2315DJ-LF-Z only when higher output current and smaller inductors are prioritized over ultra-low IQ in standby |
| TPS54202DDCR | 4.5–28 V input, 2 A output, 400–2000 kHz adjustable frequency, Eco-mode™ instead of explicit skip/PWM select | Eco-mode provides automatic light-load efficiency but lacks user-controllable mode transition and has different compensation architecture | Choose TPS54202DDCR when adaptive light-load behavior is acceptable and board space allows larger compensation components |
Compared with MP2315DJ-LF-Z and TPS54202DDCR, the MIC2179BSM offers unique externally controllable PWM/skip mode selection, 100% duty cycle for ultra-low dropout, and dedicated 20-lead SSOP layout optimized for thermal performance - making it preferable for battery-critical, noise-sensitive, and space-constrained portable designs where mode timing and efficiency trade-offs must be managed by system firmware.
Availability
MIC2179BSM is available at Aetrix Electronics and suitable for laptop computers, cellular telephones, handheld instruments, and battery chargers requiring stable component supply, long-term production continuity, and guaranteed RoHS-compliant sourcing.
Supply support for MIC2179BSM 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
Microchip Technology Inc. is a leading provider of microcontrollers, analog, FPGA, and mixed-signal semiconductors, headquartered in Chandler, Arizona, with global design, manufacturing, and sales operations.
The MIC2179BSM belongs to Microchip's high-efficiency synchronous buck regulator product line, designed specifically for battery-powered portable electronics demanding low quiescent current, wide input range, and robust protection in compact SSOP packages.
FAQ
What is the maximum output current supported by the MIC2179BSM?
The MIC2179BSM supports up to 1.5 A continuous output current under typical thermal conditions. This rating assumes proper PCB layout with adequate copper pour on PGND pins and ambient temperature ≤+85°C. Peak current capability is limited by internal current limiting: 4.3 A in PWM mode and 600 mA in skip mode. Derating is required at elevated temperatures per the device's thermal resistance and power dissipation curves in the datasheet.
How does the MIC2179BSM achieve high efficiency at light loads?
The MIC2179BSM achieves high light-load efficiency through its externally selectable skip mode, which disables switching cycles when output voltage is within regulation. In skip mode, the device draws only 600 µA quiescent current and delivers up to 300 mA output while minimizing gate charge loss and switching losses. This contrasts with forced-PWM operation, where switching continues regardless of load, increasing power consumption unnecessarily.
Can the MIC2179BSM operate with an input voltage lower than 4.5 V?
No, the MIC2179BSM cannot operate reliably below 4.5 V due to its undervoltage lockout (UVLO) threshold of 4.25 V (typical turn-on). Below this level, the internal bias regulator cannot sustain gate drive for the power MOSFETs, causing the output to shut down. For sub-4.5 V battery applications, consider regulators with lower UVLO thresholds or pre-buck architectures.
What is the purpose of the BIAS pin on the MIC2179BSM?
The BIAS pin on the MIC2179BSM provides access to the internal 3.3 V bias supply used to power the control circuitry. It must be decoupled with a 0.01 µF ceramic capacitor to SGND. No external load may be connected to this pin - it is not rated to source current beyond internal consumption, and loading will destabilize regulation and potentially damage the internal regulator.
Is the MIC2179BSM pin-compatible with other members of the MIC2179 family?
Yes, all MIC2179 variants - including MIC2179-3.3, MIC2179-5.0, and MIC2179BSM (adjustable version) - share identical 20-lead SSOP packaging and pinout. The only functional difference lies in factory-trimmed feedback reference configuration; the MIC2179BSM uses an external resistor divider on the FB pin to set output voltage, while fixed-output versions have internal dividers.
MIC2179BSM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 16.5V
- Voltage - Output (Min/Fixed):
- 1.245V
- Voltage - Output (Max):
- 16.5V
- Current - Output:
- 1.5A
- Frequency - Switching:
- 200kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
MIC2179BSM FAQ
1.How can I place an order for MIC2179BSM through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2179BSM 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 MIC2179BSM reliable?
The price and inventory of MIC2179BSM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2179BSM is usually 5 days.
3.What payment methods are accepted for MIC2179BSM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2179BSM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2179BSM?
MIC2179BSM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2179BSM 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 MIC2179BSM?
For technical support, including MIC2179BSM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2179BSM requirements.
6.How does Aetrix verify that MIC2179BSM is sourced from the original manufacturer or authorized distributors?
All MIC2179BSM 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 MIC2179BSM meets industry standards.
7.What is the process for return or replacement of MIC2179BSM?
All MIC2179BSM units undergo pre-shipment inspection (PSI). If there is an issue with MIC2179BSM, 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 MIC2179BSM part is unused and in its original packaging.
Return procedure for MIC2179BSM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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