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Microchip Technology MIC2179YSM-TR
- Part No.:
- MIC2179YSM-TR
- Manufacturer:
- Microchip Technology
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MIC2179YSM-TR.pdf
- Description:
- IC REG BUCK ADJ 1.5A 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,645
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Product details
Overview
MIC2179YSM-TR 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 optimization, features 100% duty cycle capability for low-dropout operation, and includes integrated current-mode control, thermal shutdown, and undervoltage lockout - used in battery-powered laptop and handheld instrument power supplies.
For engineers reviewing the MIC2179YSM-TR datasheet, MIC2179YSM-TR pinout, MIC2179YSM-TR application, or MIC2179YSM-TR equivalent, key selection considerations include its 200 kHz fixed switching frequency, dual-mode efficiency management (PWM >150 mA / skip <150 mA), 1.245 V feedback reference, 100% duty cycle support, and 20-pin SSOP package with validated PGND/SGND separation and SYNC/PWM mode control inputs.
Technical Context
The MIC2179YSM-TR implements current-mode control using internal current sensing and a corrective ramp, enabling stable loop compensation and superior line regulation. Its half-H-bridge switch stage integrates anti-shoot-through logic with ~50 ns dead time and supports synchronous rectification via complementary P/N MOSFETs.
It provides externally selectable PWM/skip mode via the PWM pin (logic low = PWM, logic high = skip), with skip mode self-oscillating at variable frequency (dependent on VIN, VOUT, L) and PWM mode fixed at 200 kHz (synchronizable up to 300 kHz via SYNC). The device uses pulse-by-pulse current limiting (4.3 A typ. in PWM, 600 mA in skip) and features an open-drain PWRGD flag triggered at ±10% output deviation from nominal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +4.5V to +16.5V - supports wide-range industrial and battery-powered inputs including 5V, 12V rails. |
| Output Current | Up to 1.5A - sustained load capability enabled by internal 150 mΩ MOSFETs at 12V input. |
| Switching Frequency | 200 kHz preset - fixed timing for predictable EMI profile; synchronizable to 220–300 kHz external clock. |
| Feedback Reference | 1.245 V ±25 mV - precise voltage setting point for adjustable-output configurations using resistor divider. |
| Quiescent Current | 1.0 mA (PWM), 600 μA (skip), <5 μA (shutdown) - enables ultra-low-power standby in portable systems. |
| Duty Cycle Range | 0–100% - allows dropout operation down to VIN – VOUT ≈ RON × ILOAD, critical for battery end-of-life support. |
| Current Limit Threshold | 4.3 A (PWM), 600 mA (skip) - pulse-by-pulse protection calibrated for safe MOSFET conduction. |
Pinout & Package
Package: 20-lead SSOP (Small Outline Package), surface-mount, -40°C to +85°C operating temperature range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 19, 20 | PGND | Power ground - must connect all four pins to low-impedance central ground plane for high-current return paths. |
| 3 | SW | Switch node - connects to inductor and output diode; carries full switching current and high dv/dt transients. |
| 4, 18 | NC | No connection - not internally bonded; must remain unconnected per datasheet. |
| 5 | PWM | Mode select input - logic low enables PWM mode; logic high enables skip mode; floating prohibited. |
| 6 | PWRGD | Open-drain power-good flag - active-low when FB falls 10% below 1.245 V; requires external pull-up to VIN. |
| 7 | FB | Feedback input - senses output voltage via resistor divider; 60 nA bias current affects high-R divider accuracy. |
| 8 | COMP | Error amplifier output - connects to RC compensation network for loop stability; sets mid-band gain and phase margin. |
| 9–12 | SGND | Signal ground - isolated from PGND except at single-point tie; routes low-noise analog and control signals. |
| 13 | SYNC | External clock input - rising edge synchronizes oscillator; 220–300 kHz range; connect to SGND if unused. |
| 14 | BIAS | Internal 3.3 V supply output - 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; floating prohibited. |
| 16, 17 | VIN | Main input supply - both pins must be connected to input rail; requires local 10 µF + 0.1 µF ceramic bypass. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode efficiency control | Automatically selects PWM (>150 mA) or skip (<150 mA) based on load - achieves up to 96% peak efficiency across wide current range. |
| Integrated synchronous MOSFETs | 150 mΩ high-side P-channel + 150 mΩ low-side N-channel - eliminates external diode, reduces conduction loss, improves thermal performance. |
| 100% duty cycle operation | Enables regulation with VIN – VOUT as low as RON × ILOAD - extends usable battery voltage range in portable applications. |
| Current-mode control architecture | Includes internal slope compensation and corrective ramp - simplifies loop compensation and ensures stability at >50% duty cycle. |
| Comprehensive protection suite | Integrates pulse-by-pulse current limit, thermal shutdown, undervoltage lockout (4.25 V turn-on), and shutdown mode (<5 µA IQ). |
Applications
| Laptop Power Management | Handheld Instrument Supply |
|---|---|
Use Scenario: Regulating 5 V or 3.3 V rails from 7–16 V battery or adapter input in ultraportable laptops with dynamic CPU load profiles. IC Role / Device Role / Timing Role: Primary synchronous buck regulator managing core logic voltage with adaptive PWM/skip mode switching to minimize noise during light-load display/audio states. Use Value: Maintains >90% efficiency at 10–100 mA (skip mode) and >94% at 500–1500 mA (PWM mode), reducing thermal load and extending battery runtime. | Use Scenario: Providing stable 3.3 V or 5 V supply to microcontroller, ADC, and sensor front-end in battery-operated handheld test equipment. IC Role / Device Role / Timing Role: Main DC/DC converter with programmable feedback and PWRGD monitoring - coordinates system power sequencing and brownout detection. Use Value: 100% duty cycle support sustains regulation down to 4.5 V input, enabling full instrument operation until battery reaches end-of-discharge. |
| Cellular Phone Baseband Supply | Battery Charger Auxiliary Rail |
Use Scenario: Generating low-noise 3.3 V supply for baseband processor and RF interface circuits in 4G/5G handsets with aggressive sleep/wake cycles. IC Role / Device Role / Timing Role: Efficiency-optimized buck regulator controlled by AP to switch between PWM (active call) and skip (standby) - minimizing conducted EMI during audio-sensitive periods. Use Value: Skip mode reduces switching noise and quiescent current to 600 µA, preserving signal integrity and extending standby time without compromising transient response. | Use Scenario: Delivering regulated 5 V auxiliary power to USB charging controller and status LEDs in multi-cell Li-ion battery chargers. IC Role / Device Role / Timing Role: Secondary buck regulator powered from main charger IC's HV rail - provides isolated, monitored 5 V output independent of battery state. Use Value: PWRGD flag enables real-time output health monitoring; EN pin allows firmware-controlled power gating during fault conditions or thermal throttling. |
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, 0.12 Ω MOSFETs | Higher switching frequency increases EMI but allows smaller magnetics; lacks light-load skip mode for ultra-low IQ | Prefer MP2315DJ-LF-Z where size reduction outweighs light-load efficiency needs and noise sensitivity is low. |
| TPS54202DRCT | 4.5–28 V input, 2 A output, 2.5 MHz switching, Eco-mode (similar to skip), 0.075 Ω MOSFETs | Eco-mode reduces IQ to 14 μA in light load; higher max input voltage supports wider industrial use cases | Choose TPS54202DRCT when 28 V input tolerance, sub-20 μA shutdown IQ, or 2.5 MHz operation is required. |
Compared with MP2315DJ-LF-Z and TPS54202DRCT, the MIC2179YSM-TR offers lower-frequency (200 kHz) operation for reduced EMI, explicit PWM/skip pin control for deterministic mode selection, and optimized 1.5 A capability with balanced RON - making it ideal for noise-sensitive, battery-constrained designs where layout simplicity and predictable light-load behavior are prioritized.
Availability
MIC2179YSM-TR is available at Aetrix Electronics and suitable for laptop computers, handheld instruments, cellular telephones, battery chargers, and high-efficiency battery-powered supplies requiring stable component supply and long-term production continuity.
Supply support for MIC2179YSM-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
Microchip Technology is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and power management ICs, with emphasis on reliability, longevity, and industrial-grade qualification.
The MIC2179YSM-TR belongs to Microchip's legacy high-efficiency synchronous buck regulator product line, designed specifically for battery-powered portable electronics requiring adaptive efficiency modes, robust protection, and minimal external components.
FAQ
What is the maximum output current supported by the MIC2179YSM-TR?
The MIC2179YSM-TR supports up to 1.5 A continuous output current under typical thermal conditions. This rating assumes proper PCB layout with adequate copper area for PGND/SGND planes and ambient temperature ≤+85°C. Peak current capability is limited by pulse-by-pulse current limiting (4.3 A typ. in PWM mode) and thermal shutdown activation above junction temperature +125°C.
Does the MIC2179YSM-TR require an external Schottky diode?
No, the MIC2179YSM-TR does not require an external Schottky diode because it integrates synchronous rectification using complementary P-channel and N-channel MOSFETs. During normal operation, the low-side N-channel MOSFET replaces the diode, reducing forward voltage drop and improving efficiency. An external Schottky diode (e.g., MBRM120) is only needed in skip mode during dead-time transitions or for redundancy in specific high-reliability layouts.
How is the output voltage set on the MIC2179YSM-TR?
The MIC2179YSM-TR is an adjustable-output regulator: output voltage is set using a resistive divider from VOUT to FB and from FB to GND. With a precise 1.245 V internal reference, VOUT = 1.245 × (1 + R1/R2). R2 should be between 20 kΩ and 100 kΩ to balance feedback accuracy and bias current error. The MIC2179YSM-TR itself has no fixed-output variants - all configurations rely on this external divider.
Can the MIC2179YSM-TR operate with input voltage below 4.5 V?
No, the MIC2179YSM-TR cannot operate with input voltage below 4.5 V due to undervoltage lockout (UVLO) that disables switching when VIN drops below approximately 4.25 V (typical turn-on threshold). Below 4.5 V, the internal bias regulator cannot sustain control circuitry, gate drive voltage becomes insufficient for the P-channel MOSFET, and the device remains latched in shutdown until VIN exceeds the UVLO upper threshold.
What is the function of the BIAS pin on the MIC2179YSM-TR?
The BIAS pin on the MIC2179YSM-TR outputs a regulated 3.3 V supply derived from the internal bias regulator, intended solely for decoupling. A 0.01 µF ceramic capacitor must be placed between BIAS and SGND. No external load may be connected to BIAS - it is not rated to source current beyond internal circuitry requirements and will malfunction if loaded, potentially causing regulation instability or startup failure.
MIC2179YSM-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-TR FAQ
1.How can I place an order for MIC2179YSM-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2179YSM-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 MIC2179YSM-TR reliable?
The price and inventory of MIC2179YSM-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2179YSM-TR is usually 5 days.
3.What payment methods are accepted for MIC2179YSM-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2179YSM-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2179YSM-TR?
MIC2179YSM-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2179YSM-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 MIC2179YSM-TR?
For technical support, including MIC2179YSM-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2179YSM-TR requirements.
6.How does Aetrix verify that MIC2179YSM-TR is sourced from the original manufacturer or authorized distributors?
All MIC2179YSM-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 MIC2179YSM-TR meets industry standards.
7.What is the process for return or replacement of MIC2179YSM-TR?
All MIC2179YSM-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC2179YSM-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 MIC2179YSM-TR part is unused and in its original packaging.
Return procedure for MIC2179YSM-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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