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Microchip Technology MIC2171WU-TR
- Part No.:
- MIC2171WU-TR
- Manufacturer:
- Microchip Technology
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
MIC2171WU-TR.pdf
- Description:
- IC REG BUCK BST ADJ 2.5A TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,919
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Product details
Overview
MIC2171WU-TR from Microchip Technology is a 100 kHz current-mode PWM controller IC with integrated 65 V / 2.5 A NPN power switch, designed for step-up, step-down, inverting, Cuk, and isolated flyback/forward topologies. It operates from 3 V to 40 V input, delivers up to 50 W (with external switch), and draws only 7 mA quiescent current-ideal for battery-powered handheld instruments and laptop DC-DC conversion.
For engineers reviewing the MIC2171WU-TR datasheet, MIC2171WU-TR pinout, MIC2171WU-TR application, or MIC2171WU-TR equivalent, key selection criteria include its 2.5 A internal switch rating, 1.24 V feedback reference, cycle-by-cycle current limiting, TO-263-5 package thermal performance (θJA = 45°C/W), and compatibility with LT1171/LM2577 sockets.
Technical Context
The MIC2171WU-TR implements fixed-frequency (88–112 kHz) current-mode control using an internal transconductance error amplifier (gm = 3.0–6.0 µA/mV) and 1.24 V precision bandgap reference. Its floating switch architecture enables topology flexibility without requiring external high-side drivers.
It features anti-saturation circuitry to extend usable duty cycle up to 95%, internal cycle-by-cycle current limiting (2.5–5.5 A depending on duty cycle and temperature), and compensation via the COMP pin for loop stability, soft-start, and current-limit tailoring-enabling robust regulation across wide input and load ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Rating | 65 V collector-emitter breakdown, 2.5 A peak current-supports off-line boost converters up to 50 W with external switch or self-contained <25 W designs. |
| Input Voltage Range | 3.0 V to 40 V-enables direct operation from single Li-ion (3.0 V min) to industrial 24 V rails without pre-regulation. |
| Oscillator Frequency | 100 kHz typical (88–112 kHz over temp)-provides predictable EMI profile and allows compact magnetics vs. LM2577 (50 kHz). |
| Feedback Reference | 1.240 V ±24 mV (–40°C to +85°C)-sets output voltage accuracy via external resistor divider; line regulation ≤0.6%/V ensures stability across input range. |
| Quiescent Current | 7 mA typical at 3–40 V input-minimizes standby loss in battery-operated equipment; increases only 9–20 mA under full switch load. |
| Thermal Resistance | θJA = 45°C/W (TO-263-5, 2 in² copper)-enables 1.3 W total dissipation at 70°C ambient before reaching 125°C junction limit. |
| Max Duty Cycle | 90% typical (80–95%)-supports high step-up ratios and flyback designs with low input voltages while maintaining core reset margin. |
Pinout & Package
Package: 5-pin TO-263-5 (WU suffix), thermally enhanced surface-mount package with exposed tab tied to GND. Rated for –40°C to +85°C ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - COMP | Error amplifier output | Transconductance-type node for loop compensation, soft-start capacitor connection, or external current-limit clamping-high-impedance output enables precise external control. |
| 2 - FB | Inverting input of error amplifier | Connects to mid-point of resistive divider; senses output voltage and compares to 1.24 V reference-determines regulation setpoint and loop dynamics. |
| 3 - GND | Power and signal ground | Must connect directly to input filter capacitor ground plane; serves as return for internal bias, switch emitter, and feedback network-critical for noise immunity and stability. |
| 4 - SW | Internal NPN switch collector | High-current switching node connected to inductor (boost), transformer primary (flyback), or buck choke-rated 65 V, 2.5 A peak, 0.37 Ω RON. |
| 5 - IN | Supply input | Accepts 3–40 V DC; powers internal 2.3 V regulator and all circuitry-no external bias required; supply current remains stable across input range. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode control | Eliminates right-half-plane zero in boost/flyback, simplifies compensation, and provides inherent input-voltage feed-forward for improved transient response. |
| Internal cycle-by-cycle current limit | Guarantees switch protection at 2.5 A minimum (up to 5.5 A at low duty cycles), preventing thermal runaway during overload or short-circuit conditions. |
| Anti-saturation circuitry | Reduces stored charge in internal NPN transistor, enabling reliable operation up to 90% duty cycle without secondary breakdown risk. |
| Low external component count | Requires only inductor, diode, output capacitor, and two feedback resistors-reduces BOM cost and board space vs. controller+external-FET solutions. |
| Socket compatibility | Pins and footprint match LT1171 and LM2577 in TO-220 and TO-263 packages-enables drop-in upgrade path with no PCB redesign. |
Applications
| Handheld Instrument Power Supply | Laptop Auxiliary DC-DC Converter |
|---|---|
Use Scenario: Portable multimeter or oscilloscope requiring isolated 12 V rail from 3.7 V Li-ion battery. IC Role / Device Role / Timing Role: MIC2171WU-TR acts as flyback controller with transformer isolation, generating regulated 12 V output at 0.5 A. Use Value: Internal 65 V switch withstands reflected voltage spikes; 7 mA quiescent current extends battery life between measurements. |
Use Scenario: Step-up converter supplying 19 V for USB-C PD negotiation circuitry from 5 V USB port. IC Role / Device Role / Timing Role: MIC2171WU-TR operates in boost topology, delivering 19 V @ 0.25 A with tight regulation. Use Value: 1.24 V reference and <0.6%/V line regulation ensure stable USB-PD handshake voltage despite input droop. |
| Battery-Operated Medical Sensor Node | Industrial Off-Line 24 V to 5 V Isolated Supply |
Use Scenario: Wireless ECG sensor using single AA cell (0.9–1.5 V) needing regulated 3.3 V for MCU and analog front-end. IC Role / Device Role / Timing Role: MIC2171WU-TR configured in boost mode with ultra-low VIN start-up (2.7 V min) powers entire system. Use Value: 3 V minimum operating voltage and 7 mA IQ enable >100 hours runtime on alkaline cell; current-mode control rejects battery impedance variations. |
Use Scenario: DIN-rail mounted PLC I/O module requiring reinforced isolation between 24 V field side and 5 V logic side. IC Role / Device Role / Timing Role: MIC2171WU-TR drives forward converter with tertiary reset winding, delivering 5 V @ 1 A with <1 kV isolation. Use Value: 90% max duty cycle supports safe core reset at 24 V input; TO-263 thermal performance sustains continuous operation at 85°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2577T-12/NOPB | 50 kHz fixed frequency, 3 A switch, 40 V max input, no internal current sense-requires external current-sense resistor. | Lower switching frequency demands larger magnetics; lacks cycle-by-cycle current limiting and anti-saturation. | Select when cost sensitivity outweighs size/efficiency; verify external sensing and thermal derating for same power level. |
| LT1171CT#PBF | 100 kHz, 3 A switch, 60 V max input, similar pinout but different COMP/FB biasing-requires modified compensation network. | Higher RDS(on) (0.45 Ω vs. 0.37 Ω) and lower thermal efficiency in TO-220; no guaranteed 2.5 A min current limit over temp. | Choose for legacy design continuity; confirm layout changes for COMP node stability and thermal pad soldering. |
Compared with LM2577T-12/NOPB and LT1171CT#PBF, the MIC2171WU-TR offers superior thermal performance in TO-263, tighter current-limit specification across temperature, and built-in anti-saturation-making it preferred for compact, high-reliability battery and industrial supplies where consistent 2.5 A capability and 100 kHz EMI control are critical.
Availability
MIC2171WU-TR is available at Aetrix Electronics and suitable for handheld instrument power supplies, laptop auxiliary DC-DC converters, and battery-operated medical sensor nodes requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MIC2171WU-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 global semiconductor company specializing in microcontrollers, analog devices, and power management ICs, with emphasis on reliability, longevity, and industrial-grade qualification.
The MIC2171WU-TR belongs to Microchip's legacy high-voltage switching regulator controller product line, engineered for flexible topology implementation in space-constrained, battery-sensitive, and thermally demanding applications-from portable test equipment to industrial power modules.
FAQ
What is the maximum output power achievable with the MIC2171WU-TR in boost configuration?
The MIC2171WU-TR supports up to 25 W in self-contained boost configurations using its internal 2.5 A switch. For higher power, it functions as a predriver in off-line converters up to 50 W with an external MOSFET. Actual output depends on input voltage, duty cycle, thermal management, and inductor saturation limits-designs must stay within 125°C junction temperature and respect the 2.5 A minimum current limit across –40°C to +85°C ambient.
Does the MIC2171WU-TR support synchronous rectification?
No, the MIC2171WU-TR does not support synchronous rectification. It drives a single NPN power switch and relies on external Schottky or fast-recovery diodes (e.g., 1N5822, 1N5818) for rectification in boost, flyback, and forward topologies. Its control architecture lacks gate-drive outputs or timing signals required for synchronous FET control.
Can the MIC2171WU-TR operate below 3 V input?
The MIC2171WU-TR has a minimum operating voltage of 2.7 V (typical) down to 3.0 V (guaranteed). Operation below 2.7 V is not specified and may result in unstable regulation or oscillator stoppage. For sub-2.5 V battery inputs, a pre-boost stage or alternative ultra-low-VIN controller is required-MIC2171WU-TR is not rated for coin-cell or single NiMH operation.
How is output voltage set on the MIC2171WU-TR?
Output voltage is set using a resistive divider from VOUT to GND, with the midpoint connected to the FB pin. The internal 1.24 V reference determines regulation per VOUT = 1.24 × (1 + R1/R2). R1 is typically 3–15 kΩ to balance noise immunity and light-load efficiency; R2 is calculated accordingly. Layout must minimize trace inductance on FB and COMP nodes to prevent oscillation.
Is the TO-263-5 package of the MIC2171WU-TR lead-free and RoHS compliant?
Yes, the MIC2171WU-TR is manufactured in a lead-free, RoHS-compliant TO-263-5 package, as confirmed by Microchip's packaging documentation (DS20006355A, Section 6.1). The "WU" suffix denotes the TO-263 variant, and "TR" indicates tape-and-reel packaging-both conform to JEDEC J-STD-020 moisture sensitivity level 3 and IPC/JEDEC J-STD-033 handling requirements.
MIC2171WU-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up, Step-Down, Step-Up/Step-Down
- Output Configuration:
- Positive or Negative, Isolation Capable
- Topology:
- Buck, Boost, Cuk, Flyback, Forward Converter
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- 65V (Switch)
- Current - Output:
- 2.5A (Switch)
- Frequency - Switching:
- 100kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263-5
MIC2171WU-TR FAQ
1.How can I place an order for MIC2171WU-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2171WU-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 MIC2171WU-TR reliable?
The price and inventory of MIC2171WU-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2171WU-TR is usually 5 days.
3.What payment methods are accepted for MIC2171WU-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2171WU-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2171WU-TR?
MIC2171WU-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2171WU-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 MIC2171WU-TR?
For technical support, including MIC2171WU-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2171WU-TR requirements.
6.How does Aetrix verify that MIC2171WU-TR is sourced from the original manufacturer or authorized distributors?
All MIC2171WU-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 MIC2171WU-TR meets industry standards.
7.What is the process for return or replacement of MIC2171WU-TR?
All MIC2171WU-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC2171WU-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 MIC2171WU-TR part is unused and in its original packaging.
Return procedure for MIC2171WU-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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