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Microchip Technology MIC29312WU-TR
- Part No.:
- MIC29312WU-TR
- Manufacturer:
- Microchip Technology
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
MIC29312WU-TR.pdf
- Description:
- IC REG LINEAR POS ADJ 3A TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:188
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Product details
Overview
MIC29312WU-TR from Micrel is an adjustable 3A low-dropout (LDO) linear voltage regulator in TO-263-5 (D²PAK) package, featuring 600 mV dropout at full 3A load, ±2% output accuracy over temperature/line/load, and TTL-compatible enable control. It delivers stable output from 1.24 V to 15 V and is used in high-efficiency post-regulation for switching supplies and battery-powered systems requiring precise, low-noise DC power.
For engineers reviewing the MIC29312WU-TR datasheet, MIC29312WU-TR pinout, MIC29312WU-TR application, or MIC29312WU-TR equivalent, key selection criteria include dropout voltage at 3A, adjustable feedback architecture with 1.24 V reference, EN logic-level shutdown capability, thermal shutdown and current limiting protection, and compatibility with standard 10–100 µF output capacitors.
Technical Context
The MIC29312WU-TR uses Micrel's proprietary Super beta PNP™ process to achieve low dropout and fast transient response. Its internal architecture includes a precision 1.24 V bandgap reference, high-impedance adjust pin (≤80 nA bias), and thermally protected PNP pass element with linear current limiting.
It operates across 2.3 V to 16 V input range and supports junction temperatures from 0°C to +125°C. The enable input accepts TTL/CMOS logic levels (VIH ≥ 2.4 V, VIL ≤ 0.8 V), drawing only 20 µA when active and <20 µA in shutdown - enabling true "zero-current" off-state operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3 A continuous - supports high-power digital I/O rails and processor peripherals without derating at full temperature range. |
| Dropout Voltage | 600 mV at 3 A - enables regulation from 4.2 V input to 3.3 V output, critical for battery systems and 5 V-to-3.3 V conversion. |
| Output Accuracy | ±2% over line, load, and 0°C to +125°C - ensures stable supply under worst-case thermal and loading conditions. |
| Reference Voltage | 1.240 V (min 1.215 V, max 1.265 V) - sets precise output via external resistor divider; enables accurate programmable outputs down to 1.24 V. |
| Ground Current | 60 mA at 3 A load - low quiescent current improves efficiency in high-current applications versus legacy LDOs. |
| Enable Threshold | VIH = 2.4 V, VIL = 0.8 V - direct interface with 3.3 V or 5 V logic without level-shifting circuitry. |
| Thermal Shutdown | Activates at TJ > +125°C - protects die during overload or inadequate heatsinking; auto-recovery on cooldown. |
Pinout & Package
Package: TO-263-5 (D²PAK), surface-mount, with exposed thermal pad (TAB) electrically connected to GND. Thermal resistance θJC = 2°C/W enables high-power dissipation with minimal heatsink.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - EN | Enable input | Active-high TTL/CMOS control; pulls regulator into near-zero-current shutdown (<20 µA) when low. |
| 2 - IN | Unregulated input | Accepts 2.3 V to 16 V; maximum absolute rating is +20 V; requires 0.1 µF bypass if source impedance is high. |
| 3 - GND | Ground reference | Common return for load, feedback, and thermal pad; internally tied to TAB for optimal heat transfer. |
| 4 - OUT | Regulated output | Delivers adjustable voltage (1.24–15 V); stable with ≥10 µF output capacitor (tantalum recommended for transients). |
| 5 - ADJ | Feedback reference node | Connects to resistor divider; senses 1.24 V reference; bias current ≤80 nA minimizes divider error and power loss. |
Key Features
| Feature | Design Value |
|---|---|
| Super beta PNP™ pass transistor | Enables 600 mV dropout at 3 A while maintaining fast transient recovery - avoids saturation losses of NPN-based LDOs. |
| Adjustable output (1.24–15 V) | Supported by precision 1.24 V reference and ultra-low ADJ pin bias (≤80 nA), enabling accurate, low-power resistor programming. |
| TTL-compatible enable | EN pin draws only ~20 µA when active and <20 µA in shutdown - eliminates need for external pull-ups or level shifters in logic-controlled systems. |
| Full fault protection | Integrated thermal shutdown, linear current limiting (3.0–3.8 A), reverse-input polarity tolerance, and reverse-lead insertion immunity. |
| Stable with standard capacitors | Works with 10–100 µF aluminum electrolytic or tantalum output caps - no expensive low-ESR requirement; avoids instability with ultra-low-ESR types. |
Applications
| Processor Peripheral Supply | Switching Supply Post-Regulator |
|---|---|
|
Use Scenario: Powering FPGA I/O banks or microcontroller peripherals requiring clean, tightly regulated 2.85 V or 3.3 V. IC Role / Device Role / Timing Role: Final-stage LDO delivering low-noise, low-ripple DC after a buck converter. Use Value: 600 mV dropout allows operation from 4.2 V input, preserving headroom and efficiency; ±2% accuracy maintains signal integrity across temperature. |
Use Scenario: Reducing ripple and noise on the output of a 5 V switching supply before feeding sensitive analog or RF circuitry. IC Role / Device Role / Timing Role: High-current, low-impedance post-regulator suppressing switching artifacts and improving PSRR. Use Value: Fast transient response (demonstrated with 3 A step load) and 260 µVRMS noise (with 33 µF cap) ensure stable analog performance. |
| Battery-Powered Equipment | Industrial Control Module |
|
Use Scenario: Regulating main system voltage in portable test equipment powered by 2-cell Li-ion (6.4–8.4 V). IC Role / Device Role / Timing Role: Primary 3.3 V system rail regulator with enable control for sleep/wake cycles. Use Value: "Zero-current" shutdown mode extends battery life; wide input range accommodates full battery discharge curve without dropout. |
Use Scenario: Providing reliable 5 V or 12 V auxiliary supply in PLC I/O modules operating in 0°C to +70°C ambient. IC Role / Device Role / Timing Role: Robust, protected LDO replacing discrete solutions in harsh industrial environments. Use Value: Integrated overtemperature and overcurrent protection eliminates need for external monitoring circuits; TO-263 package supports conformal coating and mechanical ruggedness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable 3A LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1529CT-5#PBF | Fixed 5 V output; no ADJ or EN pin; higher dropout (≈1.2 V @ 3 A); ±1.5% accuracy. | Limited to fixed-voltage use; lacks logic control and programmability - unsuitable where voltage flexibility or shutdown is required. | Select only if fixed 5 V output suffices and board layout already accommodates TO-220-3 footprint. |
| TPS75733KTTT | 3 A adjustable LDO with EN; lower dropout (450 mV @ 3 A); tighter accuracy (±1%); requires minimum 22 µF ceramic output cap. | Better dropout and accuracy, but stricter capacitor requirements and higher cost; not drop-in due to different pinout (TO-263-5 vs. TO-220-5). | Prefer for new designs needing superior specs; avoid if reusing MIC29312WU-TR PCB layout or using electrolytic/tantalum caps. |
Compared with LT1529CT-5#PBF and TPS75733KTTT, the MIC29312WU-TR offers unique value in its combination of adjustable output, true zero-current shutdown, proven stability with low-cost capacitors, and identical pinout across Micrel's Super beta PNP™ family - simplifying design reuse and migration.
Availability
MIC29312WU-TR is available at Aetrix Electronics and suitable for processor peripheral supplies, switching supply post-regulation, and battery-powered equipment requiring stable component supply across extended temperature and volume production cycles.
Supply support for MIC29312WU-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
Micrel, Inc. was a U.S.-based semiconductor company specializing in analog, power management, and timing ICs, acquired by Microchip Technology in 2015. Known for robust, application-focused LDOs and Super beta PNP™ process innovation.
The MIC29312WU-TR belongs to Micrel's MIC293xx family of high-current LDO regulators, designed specifically for high-efficiency linear regulation in computing, industrial, and portable systems where low dropout, fast transient response, and integrated protection are essential.
FAQ
What is the minimum load current required for stable regulation with the MIC29312WU-TR?
The MIC29312WU-TR requires a minimum load current of 10 mA to maintain proper output regulation. Below this threshold, leakage currents dominate and cause output voltage to rise above the set point. This requirement applies regardless of output voltage setting and is satisfied either by the actual load or by adding a bleed resistor across the output.
Can the MIC29312WU-TR be used with a 10 µF aluminum electrolytic capacitor on the output?
Yes, the MIC29312WU-TR is explicitly specified to be stable with a minimum 10 µF aluminum electrolytic output capacitor at full 3 A load. Unlike many modern LDOs, it does not require ultra-low-ESR ceramics - in fact, extremely low-ESR capacitors may induce instability. Tantalum is preferred for fast transient response, but aluminum electrolytics are fully supported for cost-sensitive designs.
What is the function of the ADJ pin on the MIC29312WU-TR, and what is its bias current?
The ADJ pin on the MIC29312WU-TR is the feedback input that senses the voltage divider between OUT and GND. It references an internal 1.24 V bandgap, enabling programmable output voltages from 1.24 V to 15 V. Its bias current is exceptionally low - typically 40–80 nA - minimizing divider power loss and enabling use of high-value resistors (up to 1 MΩ) without accuracy degradation.
Does the MIC29312WU-TR have built-in protection features, and which ones are included?
Yes, the MIC29312WU-TR integrates multiple protection functions: thermal shutdown activates above +125°C junction temperature; linear current limiting holds output current at 3.0–3.8 A during overload; reverse-input polarity tolerance prevents damage from accidental negative supply connection; and reverse-lead insertion protection safeguards against incorrect mounting. These features eliminate the need for external protection circuitry in most applications.
How does the EN pin behave when left unconnected on the MIC29312WU-TR?
When the EN pin is left unconnected (floating), the MIC29312WU-TR will not operate reliably - it may remain off or oscillate unpredictably. To ensure continuous operation, EN must be actively pulled high to VIN (or another valid logic-high voltage ≥2.4 V). For default-on behavior, connect EN directly to IN; for logic-controlled operation, drive it from a microcontroller GPIO or dedicated enable signal.
MIC29312WU-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
- Output Configuration:
- Positive
- Output Type:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 1.24V
- Voltage - Output (Max):
- 15V
- Voltage Dropout (Max):
- 1V @ 3A
- Current - Output:
- 3A
- Current - Quiescent (Iq):
- 20 mA
- Current - Supply (Max):
- 150 mA
- PSRR:
- -
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Reverse Polarity
- Operating Temperature:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263-5
MIC29312WU-TR FAQ
1.How can I place an order for MIC29312WU-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC29312WU-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 MIC29312WU-TR reliable?
The price and inventory of MIC29312WU-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC29312WU-TR is usually 5 days.
3.What payment methods are accepted for MIC29312WU-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC29312WU-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC29312WU-TR?
MIC29312WU-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC29312WU-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 MIC29312WU-TR?
For technical support, including MIC29312WU-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC29312WU-TR requirements.
6.How does Aetrix verify that MIC29312WU-TR is sourced from the original manufacturer or authorized distributors?
All MIC29312WU-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 MIC29312WU-TR meets industry standards.
7.What is the process for return or replacement of MIC29312WU-TR?
All MIC29312WU-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC29312WU-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 MIC29312WU-TR part is unused and in its original packaging.
Return procedure for MIC29312WU-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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