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Microchip Technology MIC2179YSM
- Part No.:
- MIC2179YSM
- Manufacturer:
- Microchip Technology
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MIC2179YSM.pdf
- Description:
- IC REG BUCK ADJ 1.5A 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,415
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Product details
Overview
MIC2179YSM from Microchip Technology is a 200 kHz synchronous buck (step-down) DC/DC regulator IC 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 optimization, features 100% duty cycle capability for low-dropout operation, and includes power-good flag, thermal shutdown, and undervoltage lockout - used in battery-powered laptop and handheld instrument power supplies.
For engineers reviewing the MIC2179YSM datasheet, MIC2179YSM pinout, MIC2179YSM application, or MIC2179YSM equivalent, key selection considerations include its externally selectable PWM/skip mode control, 1.245V feedback reference, 200 kHz fixed switching frequency (synchronizable to 300 kHz), 1.0 mA PWM-mode quiescent current, and 20-lead SSOP package with dedicated PGND/SGND separation.
Technical Context
The MIC2179YSM implements current-mode control with internal current sensing for superior line regulation and simplified loop compensation. Its half-H-bridge switch stage integrates anti-shoot-through logic and supports 100% duty cycle operation to maintain regulation under low VIN–VOUT conditions.
Mode selection is performed via the PWM pin (logic low = PWM mode; logic high = skip mode), enabling system-level dynamic efficiency/noise trade-offs. The device uses pulse-by-pulse current limiting (4.3A typical in PWM mode, 600 mA in skip mode), thermal shutdown (>125°C), and UVLO with hysteresis (4.35V turn-on, 4.15V turn-off).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +4.5V to +16.5V - supports wide-input battery and adapter-fed systems without external pre-regulation. |
| Output Current | Up to 1.5A - sustained continuous load capability enabled by internal 150 mΩ MOSFETs at 12V input. |
| Switching Frequency | 200 kHz preset (±20%) - fixed frequency simplifies EMI filtering; synchronizable to 220–300 kHz for noise-sensitive designs. |
| Feedback Reference | 1.245V ±25 mV - precision reference enables accurate adjustable output voltage setting via external resistor divider. |
| Quiescent Current | 1.0 mA (PWM), 600 µA (skip), <5 µA (shutdown) - critical for battery runtime extension in portable applications. |
| Duty Cycle Range | 0–100% - allows dropout operation down to VIN–VOUT ≈ RDS(on) × ILOAD, e.g., ~210 mV at 1.5A with 140 mΩ low-side RDS(on). |
| Operating Temperature | –40°C to +85°C ambient - qualified for industrial and consumer portable equipment environments. |
Pinout & Package
Package: 20-lead SSOP (Small Outline Package), surface-mount, lead-free, with exposed thermal pad not electrically connected. Pin 1 index marked by dot; pin numbering follows standard counter-clockwise layout from top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 19, 20 | PGND | Power ground - must be tied to central low-impedance ground point; carries high-frequency switch return current. |
| 3 | SW | Switch node - connects to inductor and output diode; experiences full VIN-to-ground swing during operation. |
| 4, 18 | NC | No internal connection - must remain unconnected; no routing or copper fill allowed. |
| 5 | PWM | Mode select input - logic low enables PWM mode; logic high enables skip mode; requires pull-up/down to avoid floating. |
| 6 | PWRGD | Open-drain power-good flag - active-low when FB voltage falls >10% below 1.245V reference; requires external pull-up to VIN. |
| 7 | FB | Feedback input - senses output voltage via resistor divider; 60 nA bias current affects high-resistor-divider accuracy. |
| 8 | COMP | Error amplifier output - connects to RC compensation network; sets loop stability and transient response. |
| 9–12 | SGND | Signal ground - isolated from PGND to prevent noise coupling into sensitive analog circuitry (FB, COMP, BIAS). |
| 13 | SYNC | Frequency sync input - accepts external clock (220–300 kHz); rising edge resets oscillator; tie to SGND if unused. |
| 14 | BIAS | Internal 3.3V bias supply - requires 0.01 µF ceramic bypass to SGND; zero external load tolerance. |
| 15 | EN | Enable input - logic high enables regulator; logic low forces shutdown (<5 µA IQ); requires defined logic level. |
| 16, 17 | VIN | Main input supply - both pins must be connected to same input rail; requires local 10 µF + 0.1 µF bypass to PGND. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode efficiency optimization | PWM mode (>150 mA load) delivers up to 96% efficiency; skip mode (<150 mA) reduces switching losses and audible noise. |
| Integrated synchronous power stage | 150 mΩ high-side P-MOSFET + 150 mΩ low-side N-MOSFET eliminates external diode and reduces conduction loss. |
| Current-mode control architecture | Enables stable operation across wide input/output ranges with simplified Type II compensation on COMP pin. |
| Low-dropout 100% duty cycle | Maintains regulation even when VIN approaches VOUT; essential for battery end-of-discharge operation. |
| System-level protection suite | Includes pulse-by-pulse current limit (4.3A), thermal shutdown (>125°C), UVLO (4.25V hysteresis), and open-drain PWRGD. |
Applications
| Laptop Power Management | Cellular Baseband Supply |
|---|---|
Use Scenario: Regulating 5V or 3.3V rails from Li-ion battery (3.0–4.2V) or adapter (5–16.5V) in ultraportable notebooks. IC Role / Device Role / Timing Role: Primary synchronous buck converter providing core logic voltage with dynamic mode switching. Use Value: Dual-mode operation extends battery life by reducing quiescent current to 600 µA during light-load sleep states. |
Use Scenario: Powering RF transceivers and baseband processors in 4G/5G handsets where burst-mode current demands vary widely. IC Role / Device Role / Timing Role: Step-down regulator with externally controlled PWM/skip mode to minimize conducted EMI during transmission bursts. Use Value: Skip mode suppresses switching noise during receive intervals, improving receiver sensitivity and SNR. |
| Handheld Test Instrumentation | Battery Charger Auxiliary Rail |
Use Scenario: Generating stable 3.3V or 5.0V supply for microcontroller, ADC, and display drivers in portable DMMs and oscilloscopes. IC Role / Device Role / Timing Role: High-efficiency, low-noise DC/DC converter with precise 1.245V reference for metrology-grade accuracy. Use Value: 100% duty cycle ensures uninterrupted operation as battery voltage drops below 3.6V while maintaining regulation. |
Use Scenario: Providing isolated 3.3V bias for charger controller ICs and status LEDs in multi-cell Li-ion charging modules. IC Role / Device Role / Timing Role: Secondary buck regulator powered from main charger output (12–16.5V), operating in skip mode during standby. Use Value: <5 µA shutdown current prevents parasitic drain on battery during long-term storage or transport. |
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 | Fixed 3.3V/5.0V output only; no adjustable version; 2.5A rating; 500 kHz switching; no skip mode. | Higher output current but lacks external PWM/skip control and adjustable feedback - less flexible for multi-rail systems. | Select when fixed-output, higher-current, and smaller solution size outweigh need for mode control and adjustability. |
| TPS54202DDCR | Adjustable output; 4.5–28V input; 2A rating; 400–2200 kHz programmable frequency; Eco-mode instead of discrete skip/PWM selection. | Eco-mode is automatic (not pin-controlled); no dedicated PWRGD flag; different compensation topology. | Choose when wider input range, higher current, and automatic light-load optimization are prioritized over deterministic mode control. |
Compared with MP2315DJ-LF-Z and TPS54202DDCR, the MIC2179YSM uniquely provides externally controllable PWM/skip mode selection, a dedicated open-drain PWRGD signal, and 100% duty cycle capability - making it optimal for battery-powered systems requiring deterministic noise management and ultra-low-quiescent operation.
Availability
MIC2179YSM is available at Aetrix Electronics and suitable for laptop computers, cellular telephones, handheld instruments, and battery chargers requiring stable component supply with guaranteed long-term manufacturability and consistent electrical performance.
Supply support for MIC2179YSM 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 is a global semiconductor company specializing in microcontrollers, analog devices, and power management ICs, with a focus on reliability, longevity, and embedded system integration.
The MIC2179YSM belongs to Microchip's high-efficiency synchronous buck regulator product line, designed specifically for battery-powered portable electronics where adaptive efficiency, low-noise operation, and robust protection are critical.
FAQ
What is the maximum output current supported by the MIC2179YSM?
The MIC2179YSM supports up to 1.5A continuous output current under typical conditions (VIN = 12V, TA = +25°C). This is enabled by its integrated 150 mΩ high-side and low-side MOSFETs. Derating is required at elevated ambient temperatures or with poor PCB thermal design; peak current limit is 4.3A in PWM mode and 600 mA in skip mode. The MIC2179YSM datasheet specifies 1.5A as the rated output capability with proper layout and thermal management.
How does the MIC2179YSM implement dual-mode operation?
The MIC2179YSM uses an external logic signal on the PWM pin to select between two distinct operating modes: logic low enables constant-frequency PWM mode (optimal above 150 mA), while logic high activates variable-frequency skip mode (optimal below 150 mA). This external control allows system-level intelligence (e.g., host MCU) to dynamically optimize efficiency versus noise. The MIC2179YSM does not auto-switch modes - selection is fully deterministic and user-directed.
What is the purpose of separate PGND and SGND pins on the MIC2179YSM?
The MIC2179YSM separates power ground (PGND, pins 1/2/19/20) from signal ground (SGND, pins 9–12) to isolate high-current switching return paths from sensitive analog circuitry (FB, COMP, BIAS). PGND carries pulsed inductor return current; SGND serves error amplifier, reference, and bias circuits. They must be connected at a single low-impedance point - typically under the IC - to prevent ground bounce from corrupting regulation accuracy. This separation is critical for stable operation per the MIC2179YSM layout guidelines.
Can the MIC2179YSM operate with input voltage below 4.5V?
No - the MIC2179YSM incorporates undervoltage lockout (UVLO) that disables operation when VIN falls below approximately 4.25V (typical turn-on threshold). Operation is prohibited below 4.5V per absolute specifications, and attempting to force operation risks failure to regulate or erratic behavior. The MIC2179YSM is not designed for sub-4.5V inputs; for lower-voltage battery applications, consider regulators with 2.7V or 3.0V minimum input ratings.
What is the function of the BIAS pin on the MIC2179YSM?
Pin 14 (BIAS) provides the regulated 3.3V internal supply voltage used by the MIC2179YSM's control circuitry. It must be decoupled with a 0.01 µF ceramic capacitor to SGND, placed adjacent to the pin. The MIC2179YSM BIAS pin is not intended to power external circuitry - applying any load will degrade regulation accuracy and may cause instability. Its sole purpose is internal biasing, and the capacitor ensures low-impedance AC grounding for noise rejection.
MIC2179YSM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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
MIC2179YSM FAQ
1.How can I place an order for MIC2179YSM through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2179YSM 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 MIC2179YSM reliable?
The price and inventory of MIC2179YSM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2179YSM is usually 5 days.
3.What payment methods are accepted for MIC2179YSM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2179YSM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2179YSM?
MIC2179YSM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2179YSM 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 MIC2179YSM?
For technical support, including MIC2179YSM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2179YSM requirements.
6.How does Aetrix verify that MIC2179YSM is sourced from the original manufacturer or authorized distributors?
All MIC2179YSM 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 MIC2179YSM meets industry standards.
7.What is the process for return or replacement of MIC2179YSM?
All MIC2179YSM units undergo pre-shipment inspection (PSI). If there is an issue with MIC2179YSM, 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 MIC2179YSM part is unused and in its original packaging.
Return procedure for MIC2179YSM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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