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Microchip Technology MIC2179-3.3YSM-TR
- Part No.:
- MIC2179-3.3YSM-TR
- Manufacturer:
- Microchip Technology
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MIC2179-3.3YSM-TR.pdf
- Description:
- IC REG BUCK 3.3V 1.5A 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
MIC2179-3.3YSM-TR from Microchip Technology is a fixed-output 3.3V, 1.5A synchronous buck DC/DC regulator with dual-mode PWM/skip operation, 200 kHz switching frequency, and internal 150 mΩ high-side/low-side MOSFETs. It delivers up to 96% efficiency across load currents from 600 mA (PWM) down to light loads (<150 mA in skip mode), supporting battery-powered systems requiring low quiescent current (600 µA in skip mode) and low-dropout operation (100% duty cycle).
For engineers reviewing the MIC2179-3.3YSM-TR datasheet, MIC2179-3.3YSM-TR pinout, MIC2179-3.3YSM-TR application, or MIC2179-3.3YSM-TR equivalent, this page provides verified functional specifications, validated package mapping to 20-lead SSOP, confirmed pin roles including PWRGD open-drain flag and SYNC synchronization input, and real-world design implications for efficiency trade-offs, thermal behavior, and mode selection logic.
Technical Context
The MIC2179-3.3YSM-TR implements current-mode control with internal current sensing, enabling simplified loop compensation and superior line regulation. Its dual-mode architecture uses external logic on the PWM pin to select between constant-frequency PWM (for >150 mA loads) and self-oscillating skip mode (for <150 mA), with distinct current limits: 4.3 A (PWM) vs. 600 mA (skip).
It integrates a 3.3 V internal bias regulator (BIAS pin), undervoltage lockout (4.25 V turn-on, 4.15 V turn-off), thermal shutdown, and pulse-by-pulse current limiting. The 20-lead SSOP package features four PGND pins (1,2,19,20) and four SGND pins (9–12) for optimized power/signal ground separation, with dedicated SW, FB, COMP, EN, and PWRGD terminals for standard buck converter implementation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±3% (3.20–3.40 V at 10 mA–1 A load, 5–16 V input) |
| Max Output Current | 1.5 A continuous (limited by thermal design); 300 mA max in skip mode |
| Input Voltage Range | 4.5 V to 16.5 V - supports 5 V, 12 V rails and wide-input industrial/battery systems |
| Switching Frequency | 200 kHz preset (±20% over temp); synchronizable to 220–300 kHz external clock via SYNC pin |
| Quiescent Current | 600 µA in skip mode - enables multi-day standby in portable devices |
| Efficiency | Up to 96% at full load; optimized for light-load efficiency via skip mode |
| Shutdown Current | <5 µA - critical for battery leakage control during system sleep |
| Feedback Reference | 1.245 V internal reference - sets output accuracy and stability margin |
Pinout & Package
Package: 20-lead SSOP (Small Outline Package), surface-mount, lead-free, -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 to low-impedance central ground plane for switch-node return path |
| 3 | SW | Switch node - connects to inductor and output diode; carries high dv/dt and peak currents |
| 4, 18 | NC | No connection - not internally bonded; leave unconnected and un-routed |
| 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 pull-up to VIN |
| 7 | FB | Feedback input - monitors regulated 3.3 V output via internal resistor divider (no external resistors needed) |
| 8 | COMP | Error amplifier output - connects to RC compensation network for loop stability |
| 9–12 | SGND | Signal ground - separate from PGND; ties analog/feedback circuitry to minimize noise coupling |
| 13 | SYNC | Frequency sync input - accepts 220–300 kHz external clock; tie 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 regulation; logic low forces <5 µA shutdown current |
| 16, 17 | VIN | Main input supply - both pins must be connected to 4.5–16.5 V rail with local 10 µF + 0.1 µF decoupling |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode PWM/skip control | Enables dynamic efficiency optimization: 96% at full load (PWM) and sub-1 mA IQ at light load (skip) |
| 100% duty cycle capability | Supports low-dropout operation down to VIN – VOUT < 1 V, extending battery runtime in deep discharge |
| Integrated 150 mΩ MOSFETs | Eliminates external high-side/low-side switches; reduces BOM count and layout complexity |
| Current-mode architecture | Provides inherent cycle-by-cycle current limiting and stable loop compensation without external ramp generator |
| Open-drain PWRGD flag | Signals system controller when output deviates >10% from 3.3 V, enabling safe power sequencing |
| Thermal shutdown & UVLO | Protects against overtemperature (>125°C junction) and insufficient input voltage (<4.15 V) |
Applications
| Portable Medical Instrumentation | Laptop Subsystem Power |
|---|---|
Use Scenario: Powering microcontroller, sensor interface, and Bluetooth radio in handheld glucose meters or pulse oximeters. IC Role / Device Role / Timing Role: Primary 3.3 V buck regulator delivering clean, efficient power under variable battery voltage (6–14 V) and intermittent 10–500 mA loads. Use Value: Skip mode extends battery life beyond 72 hours in standby; PWRGD enables firmware-controlled brown-out recovery. |
Use Scenario: Supplying 3.3 V to USB-C PD controllers, EC (Embedded Controller), and touchpad ICs in ultrabooks. IC Role / Device Role / Timing Role: Secondary buck regulator fed from main 12 V rail, operating in PWM mode during active use and skip mode during S3/S4 sleep states. Use Value: 600 µA skip-mode IQ prevents overnight battery drain; SYNC pin allows EMI reduction by aligning switching to system clock domain. |
| Industrial Handheld Scanner | Smartphone Baseband Power |
Use Scenario: Providing regulated 3.3 V to CMOS image sensor, laser driver, and decode ASIC in rugged barcode scanners. IC Role / Device Role / Timing Role: Main system regulator handling pulsed 1.2 A loads during scan bursts and 20 mA idle current between scans. Use Value: Dual-mode operation avoids audible coil whine (skip mode) during idle while maintaining 95% efficiency during burst (PWM mode). |
Use Scenario: Delivering 3.3 V to baseband processor and RF transceiver in legacy smartphone designs with discrete PMIC architecture. IC Role / Device Role / Timing Role: Standalone buck converter managing dynamic load steps from 50 mA (idle) to 1.5 A (transmit burst) without external supervision. Use Value: Internal current limit (4.3 A) and thermal shutdown prevent damage during short-circuit events; EN pin enables fast power cycling per modem command. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2451DT-LF-Z | Fixed 3.3 V, 0.6 A output; 2 MHz switching; no skip mode; 3.5 µA shutdown current | Lower current capacity and no light-load efficiency optimization - suitable only for low-power always-on subsystems | Select when board space is constrained and 600 mA max load suffices; avoid for battery runtime-critical designs. |
| TPS54202DRCT | Adjustable output (0.6–17 V); 2 A output; 500 kHz switching; integrated soft-start; 26 µA quiescent current in Eco-mode | Requires external feedback resistors; higher IQ than MIC2179-3.3YSM-TR in skip mode; better for multi-rail flexibility | Choose when adjustable output or higher current is required; MIC2179-3.3YSM-TR remains superior for fixed 3.3 V, ultra-low-IQ battery apps. |
Compared with MP2451DT-LF-Z and TPS54202DRCT, the MIC2179-3.3YSM-TR uniquely combines fixed 3.3 V output, 1.5 A capability, sub-1 mA skip-mode IQ, and 100% duty cycle - making it optimal for space-constrained, battery-sensitive applications where simplicity and light-load efficiency are non-negotiable.
Availability
MIC2179-3.3YSM-TR is available at Aetrix Electronics and suitable for portable medical instrumentation, industrial handheld scanners, laptop subsystem power, and smartphone baseband power requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for MIC2179-3.3YSM-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 manufacturer specializing in microcontrollers, analog, FPGA, and power management ICs, with emphasis on reliability, longevity, and industrial-grade qualification.
The MIC2179 product line is designed for high-efficiency, battery-powered DC/DC conversion in portable and embedded systems - prioritizing light-load efficiency, thermal robustness, and integration of control, power switches, and protection in compact SSOP packages.
FAQ
What is the maximum output current capability of the MIC2179-3.3YSM-TR?
The MIC2179-3.3YSM-TR supports up to 1.5 A continuous output current under proper thermal conditions (e.g., 4-layer PCB with thermal vias and copper pour). In skip mode, its maximum regulated output is limited to approximately 300 mA due to the 600 mA current limit threshold; exceeding this causes dropout. The datasheet specifies 4.3 A pulse-by-pulse current limit in PWM mode, but sustained current is thermally constrained. Always verify junction temperature using θJA and ambient conditions in final layout.
Does the MIC2179-3.3YSM-TR require external feedback resistors?
No, the MIC2179-3.3YSM-TR is a fixed-output variant with internal resistor divider set to 3.3 V. The FB pin is internally connected to the output divider, so no external resistors are needed - unlike the adjustable MIC2179 version. This simplifies layout, eliminates resistor tolerance errors, and ensures guaranteed 3.3 V ±3% accuracy across temperature and load per the datasheet's electrical characteristics table.
How does the PWM/Skip mode selection work on the MIC2179-3.3YSM-TR?
The MIC2179-3.3YSM-TR uses the PWM pin (Pin 5) for external mode selection: a logic low (≤0.6 V) forces PWM mode for high-current, low-noise operation; a logic high (≥1.1 V) enables skip mode for ultra-low quiescent current (600 µA) at light loads. The device powers up only in PWM mode, so the control system must assert low on startup. Mode switching must occur only when load current is below 200 mA to prevent regulation loss during transition.
What is the purpose of the BIAS pin on the MIC2179-3.3YSM-TR?
Pin 14 (BIAS) provides the 3.3 V output of the MIC2179-3.3YSM-TR's internal bias regulator, used exclusively to power internal control circuitry. It must be bypassed with a 0.01 µF ceramic capacitor to SGND, as specified in the datasheet. No external load may be connected - doing so risks regulation failure and violates absolute maximum ratings. The BIAS pin is not an auxiliary supply output; it serves only internal biasing.
Can the MIC2179-3.3YSM-TR operate with input voltage below 4.5 V?
No - the MIC2179-3.3YSM-TR has undervoltage lockout (UVLO) with a turn-on threshold of 4.25 V (typical) and turn-off hysteresis down to 4.15 V. Input voltages below 4.5 V will prevent startup or cause shutdown. Attempting to operate below UVLO risks erratic behavior, incomplete gate drive, and potential shoot-through in the internal MOSFETs. For sub-4.5 V inputs, consider alternative regulators such as Microchip's MIC24045 or similar low-VIN buck devices.
MIC2179-3.3YSM-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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 16.5V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- 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
MIC2179-3.3YSM-TR FAQ
1.How can I place an order for MIC2179-3.3YSM-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2179-3.3YSM-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 MIC2179-3.3YSM-TR reliable?
The price and inventory of MIC2179-3.3YSM-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2179-3.3YSM-TR is usually 5 days.
3.What payment methods are accepted for MIC2179-3.3YSM-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2179-3.3YSM-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2179-3.3YSM-TR?
MIC2179-3.3YSM-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2179-3.3YSM-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 MIC2179-3.3YSM-TR?
For technical support, including MIC2179-3.3YSM-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2179-3.3YSM-TR requirements.
6.How does Aetrix verify that MIC2179-3.3YSM-TR is sourced from the original manufacturer or authorized distributors?
All MIC2179-3.3YSM-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 MIC2179-3.3YSM-TR meets industry standards.
7.What is the process for return or replacement of MIC2179-3.3YSM-TR?
All MIC2179-3.3YSM-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC2179-3.3YSM-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 MIC2179-3.3YSM-TR part is unused and in its original packaging.
Return procedure for MIC2179-3.3YSM-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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