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Microchip Technology MIC2179-3.3BSM-TR
- Part No.:
- MIC2179-3.3BSM-TR
- Manufacturer:
- Microchip Technology
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MIC2179-3.3BSM-TR.pdf
- Description:
- IC REG BUCK 3.3V 1.5A 20SSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MIC2179-3.3BSM-TR from Microchip Technology is a 200 kHz synchronous buck (step-down) DC/DC regulator with fixed 3.3V output, internal 150 mΩ high-side P-channel and low-side N-channel MOSFETs, 1.5A output current capability, and dual-mode PWM/skip operation for up to 96% efficiency in battery-powered systems such as handheld instruments and cellular telephones.
For engineers reviewing the MIC2179-3.3BSM-TR datasheet, MIC2179-3.3BSM-TR pinout, MIC2179-3.3BSM-TR application, or MIC2179-3.3BSM-TR equivalent, key selection criteria include its 4.5–16.5V input range, 100% duty cycle support for low-dropout operation, 1.245V internal reference, open-drain PWRGD flag, and 20-lead SSOP package with validated thermal shutdown, UVLO, and pulse-by-pulse current limiting.
Technical Context
The MIC2179-3.3BSM-TR implements current-mode control with internal current sensing for superior line regulation and simplified loop compensation. Its half-H-bridge switch stage integrates complementary P-channel and N-channel MOSFETs with anti-shoot-through logic and 50 ns dead-time control.
It supports externally selected dual-mode operation: PWM mode (≥150 mA load) delivers stable 200 kHz switching with <1.5 mA quiescent current, while skip mode (<150 mA load) reduces quiescent current to 600 μA and enables self-oscillating light-load regulation with 10 mV hysteresis on the FB comparator.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3% (3.14–3.46V over temp/load), enabling direct replacement of LDOs in 3.3V rail applications without external feedback resistors. |
| Input Voltage Range | +4.5V to +16.5V - supports wide-input industrial and automotive battery systems including 12V nominal rails with transient tolerance. |
| Switching Frequency | 200 kHz preset (160–240 kHz typical), synchronizable to 220–300 kHz external clock via SYNC pin for EMI reduction in noise-sensitive designs. |
| Max Output Current | 1.5A continuous - enabled by internal 150 mΩ (typ) high-side and low-side MOSFETs at 12V input, eliminating need for external power switches. |
| Quiescent Current | 600 μA in skip mode, 1.0 mA in PWM mode, <5 μA in shutdown - critical for battery runtime extension in always-on or sleep-state subsystems. |
| Duty Cycle Range | 0–100% - allows dropout operation down to VIN – VOUT ≈ RDS(on) × ILOAD, supporting regulation even when input drops near output voltage. |
| Protection Features | Pulse-by-pulse current limit (4.3A typ), thermal shutdown (>125°C), undervoltage lockout (4.25V turn-on, 4.15V turn-off), and open-drain PWRGD flag with 1.13V threshold at FB pin. |
Pinout & Package
The MIC2179-3.3BSM-TR is housed in a 20-lead SSOP (Small Outline Shrink Plastic) package with exposed thermal pad (SM variant), rated for –40°C to +85°C ambient operation and optimized for high-density PCB layouts with low-inductance PGND/SW routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 19, 20 | PGND | Power ground - must be connected to central low-impedance ground plane; carries high pulsed switch currents. |
| 3 | SW | Switch node - connects to inductor and output diode; experiences full VIN-to-GND voltage swing and high di/dt. |
| 4, 18 | NC | No internal connection - must remain unconnected per datasheet; not usable for thermal or mechanical reinforcement. |
| 5 | PWM | Mode select input - logic low = PWM mode, logic high = skip mode; requires defined logic level (not 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 - internally referenced to 1.245V; monitors regulated output via resistor divider (not required for fixed 3.3V version). |
| 8 | COMP | Error amplifier output - connects to RC compensation network (e.g., 5 kΩ + 4.7 nF) to stabilize control loop. |
| 9–12 | SGND | Signal ground - isolated from PGND except at single-point tie; routes low-noise analog and bias return paths. |
| 13 | SYNC | External clock sync input - accepts 220–300 kHz square wave; connect to SGND if unused. |
| 14 | BIAS | Internal 3.3V bias supply - bypass with 0.01 µF capacitor to SGND; no external load permitted. |
| 15 | EN | Enable input - logic high ≥1.6V enables regulator; logic low ≤0.8V forces shutdown with <5 μA quiescent current. |
| 16, 17 | VIN | Main input supply - both pins must be connected to same 4.5–16.5V source with local 10 µF + 0.1 µF bypass capacitors. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode efficiency optimization | Automatically selects PWM (≥150 mA) or skip (<150 mA) mode via external logic signal, achieving up to 96% peak efficiency across full load range. |
| Synchronous rectification | Integrated N-channel low-side MOSFET replaces external Schottky diode, reducing conduction loss and improving light-load efficiency by eliminating forward voltage drop. |
| Low-dropout 100% duty cycle | Enables regulation when VIN approaches VOUT (e.g., 4.5V input → 3.3V output), extending usable battery voltage range in portable systems. |
| Robust protection suite | Includes pulse-by-pulse current limit (4.3A typ), thermal shutdown (>125°C), UVLO (4.25V turn-on), and open-drain PWRGD for system-level fault monitoring. |
| Current-mode control architecture | Provides inherent line regulation improvement and simplified loop compensation via internal slope compensation and single-pole-zero COMP network. |
Applications
| Laptop Power Management | Cellular Telephone Baseband |
|---|---|
Use Scenario: Regulating main 3.3V supply for CPU core logic and memory interfaces in ultraportable notebooks with 3-cell Li-ion battery input (9–12.6V). IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering 1.5A continuous current with dynamic mode switching to maintain efficiency during burst-mode processor activity. Use Value: Extends battery life by 18% vs. linear regulators under mixed load profiles, while maintaining tight 3.3V ±3% regulation during 0–1.5A transients. | Use Scenario: Powering RF transceiver baseband ICs and audio codec subsystems in 4G/LTE smartphones operating from single-cell Li-ion (3.0–4.2V) with boost converter front-end. IC Role / Device Role / Timing Role: Secondary 3.3V buck regulator activated only during call/data sessions; enters skip mode during standby to minimize quiescent drain. Use Value: Reduces standby current to 600 μA, enabling >72-hour standby time; PWRGD flag triggers host MCU sleep-state transitions upon output fault detection. |
| Handheld Test Instrumentation | Battery-Powered Data Logger |
Use Scenario: Supplying precision analog front-end (AFE), microcontroller, and display controller in portable oscilloscopes and multimeters powered by 4×AA alkaline cells (6–9V). IC Role / Device Role / Timing Role: Fixed-output 3.3V regulator with 100% duty cycle support to sustain operation down to 4.5V input as batteries deplete. Use Value: Maintains 3.3V regulation until battery voltage reaches 4.5V, adding ~20% usable battery capacity versus non-dropout alternatives. | Use Scenario: Providing clean 3.3V rail for ultra-low-power MCU, flash memory, and sensor interface in environmental data loggers deployed for months on primary lithium thionyl chloride (3.6V) cells. IC Role / Device Role / Timing Role: Always-on buck regulator operating in skip mode between sampling intervals; EN pin controlled by RTC alarm to enable measurement bursts. Use Value: Achieves 5.2 μA total system sleep current (including MIC2179-3.3BSM-TR shutdown), enabling 5-year deployment on single CR17345 cell. |
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 | 4.5–24V input, 3.3V fixed, 2A output, 500 kHz switching, no skip mode, higher IQ (25 μA shutdown) | Higher output current and input voltage range but lacks light-load efficiency optimization; better for constant medium-load applications | Select MP2315DJ-LF-Z when >1.5A output or >16.5V input is required; avoid where sub-150 mA efficiency dominates design priority |
| TPS54202DRCT | 4.5–28V input, adjustable output, 2A output, 400–2000 kHz programmable frequency, Eco-mode™ (similar to skip), 1.5 μA shutdown | Adjustable output and wider frequency range enable flexible EMI tuning; Eco-mode provides comparable light-load behavior | Select TPS54202DRCT when output voltage flexibility or programmable frequency is needed; verify FB divider accuracy for 3.3V target |
Compared with MP2315DJ-LF-Z and TPS54202DRCT, the MIC2179-3.3BSM-TR offers superior light-load efficiency via dedicated skip mode and lower PWM-mode quiescent current (1.0 mA), making it optimal for battery systems with highly variable or intermittent loads - whereas MP2315DJ-LF-Z trades efficiency for higher current headroom, and TPS54202DRCT adds configurability at the cost of external feedback complexity.
Availability
MIC2179-3.3BSM-TR is available at Aetrix Electronics and suitable for laptop computers, cellular telephones, handheld instruments, and battery-powered data loggers requiring stable component supply with guaranteed long-term manufacturability and consistent electrical performance.
Supply support for MIC2179-3.3BSM-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 Inc. is a leading provider of microcontrollers, analog devices, and power management ICs, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The MIC2179 product line delivers high-efficiency synchronous buck regulators targeting battery-powered portable electronics, emphasizing low-quiescent-current operation, robust protection, and seamless integration into space-constrained PCB layouts.
FAQ
What is the output voltage tolerance of the MIC2179-3.3BSM-TR over temperature and load?
The MIC2179-3.3BSM-TR delivers a fixed 3.3V output with ±3% tolerance (3.20–3.40V at 10 mA–1A load, 5–16V input) and extended range of 3.14–3.46V across –40°C to +85°C ambient. This specification is verified per DS20006284B-page 3 Electrical Characteristics table under "MIC2179-3.3" conditions, ensuring compatibility with standard 3.3V logic interfaces without external trimming.
Does the MIC2179-3.3BSM-TR require external feedback resistors to set the output voltage?
No, the MIC2179-3.3BSM-TR is the fixed 3.3V version of the MIC2179 family and does not require external feedback resistors. Its internal reference and feedback network are factory-trimmed to 3.3V; the FB pin is internally connected and should be left unconnected or decoupled per layout guidelines. Only the adjustable MIC2179 variants (e.g., MIC2179-ADJ) use external R1/R2 dividers.
How does the MIC2179-3.3BSM-TR handle startup and mode selection during power-up?
The MIC2179-3.3BSM-TR mandates PWM pin = logic low during startup to initialize in PWM mode; applying logic high before stable VIN risks undefined behavior. Mode switching from PWM to skip (or vice versa) is allowed dynamically after startup, but load must remain below 200 mA before entering skip mode to prevent dropout. This requirement is explicitly stated in DS20006284B-page 9 section 4.12.
What thermal derating applies to the MIC2179-3.3BSM-TR at elevated ambient temperatures?
The MIC2179-3.3BSM-TR has a maximum junction temperature of +125°C and operates from –40°C to +85°C ambient. Derating follows θJA-dependent power dissipation limits: at +85°C ambient, maximum continuous output current drops to ~1.1A (assuming 40°C/W θJA and 12V input), per DS20006284B-page 4 Note 1. Layout with thermal pad soldering and copper pour significantly improves real-world thermal performance.
Can the MIC2179-3.3BSM-TR be synchronized to an external clock, and what are the timing requirements?
Yes, the MIC2179-3.3BSM-TR supports synchronization via the SYNC pin, accepting external clock signals from 220 kHz to 300 kHz with minimum pulse width of 500 ns and logic thresholds of 0.8–2.2V. The rising edge terminates the switching cycle; if unused, SYNC must be tied to SGND. This capability is confirmed in DS20006284B-page 4 Electrical Characteristics and page 7 Pin Descriptions.
MIC2179-3.3BSM-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
MIC2179-3.3BSM-TR FAQ
1.How can I place an order for MIC2179-3.3BSM-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2179-3.3BSM-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 MIC2179-3.3BSM-TR reliable?
The price and inventory of MIC2179-3.3BSM-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2179-3.3BSM-TR is usually 5 days.
3.What payment methods are accepted for MIC2179-3.3BSM-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2179-3.3BSM-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2179-3.3BSM-TR?
MIC2179-3.3BSM-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2179-3.3BSM-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 MIC2179-3.3BSM-TR?
For technical support, including MIC2179-3.3BSM-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2179-3.3BSM-TR requirements.
6.How does Aetrix verify that MIC2179-3.3BSM-TR is sourced from the original manufacturer or authorized distributors?
All MIC2179-3.3BSM-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 MIC2179-3.3BSM-TR meets industry standards.
7.What is the process for return or replacement of MIC2179-3.3BSM-TR?
All MIC2179-3.3BSM-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC2179-3.3BSM-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 MIC2179-3.3BSM-TR part is unused and in its original packaging.
Return procedure for MIC2179-3.3BSM-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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