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Microchip Technology MIC37151-3.3WR-TR
- Part No.:
- MIC37151-3.3WR-TR
- Manufacturer:
- Microchip Technology
- Package:
- SPAK-5 (5 Leads + Tab)
- Datasheet:
-
MIC37151-3.3WR-TR.pdf
- Description:
- IC REG LINEAR 3.3V 1.5A SPAK-5
- Quantity:
- Payment:
- Shipping:
Inventory:550
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Product details
Overview
MIC37151-3.3WR-TR from Microchip Technology is a 1.5A fixed-output low-dropout linear voltage regulator in 5-lead S-Pak (WR) package, delivering 3.3V ±1.0% at up to 1.5A with 500 mV max dropout at full load and –40°C to +125°C junction temperature range. It integrates logic-controlled shutdown, error flag output, reverse-leakage protection, and stable operation with ceramic or tantalum capacitors - ideal for post-regulation in battery-powered digital systems.
For engineers reviewing the MIC37151-3.3WR-TR datasheet, MIC37151-3.3WR-TR pinout, MIC37151-3.3WR-TR application, or MIC37151-3.3WR-TR equivalent, key selection criteria include guaranteed 1.5A output current, 500 mV dropout at 1.5A, EN/FLG dual-control interface, thermal/current-limit protection, and compatibility with low-ESR ceramic output capacitors ≥10 μF.
Technical Context
The MIC37151-3.3WR-TR uses a Super ßeta PNP pass transistor architecture enabling ultra-low dropout (≤500 mV at 1.5A) across –40°C to +125°C, making it suitable for 3.3V-to-2.5V conversion without entering dropout. Its open-collector FLG pin asserts low when VOUT drops ≥5% below nominal, while EN pin accepts TTL/CMOS logic for <1 µA shutdown current.
It operates from 2.25V to 6.0V input, supports 10 mA minimum load, requires ≥10 μF output capacitance (ceramic or tantalum), and delivers ±1.0% initial output tolerance with 0.2% load regulation (10 mA–1.5A) and 0.06% line regulation (VOUT+1V to 6.0V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1.0% at 10 mA; ±2% over full load and temperature range |
| Max Output Current | 1.5A minimum guaranteed - sufficient for PLDs, microcontrollers, and DSPs |
| Dropout Voltage | ≤500 mV at 1.5A and full temperature range - enables operation from 3.8V input for 3.3V output |
| Input Voltage Range | 2.25V to 6.0V - supports single-cell Li-ion, multi-cell alkaline, and SMPS pre-regulated rails |
| Ground Current | 17–30 mA at 1.5A load - low quiescent current improves efficiency in battery applications |
| Enable Threshold | VIL ≤ 0.8V (shutdown), VIH ≥ 2.25V (enable) - compatible with 3.3V and 5V logic interfaces |
| Flag Output | Open-collector FLG sinks ≥250 µA at ≤300 mV when VOUT falls ≥5% - enables fault detection without external pull-up |
Pinout & Package
Package: 5-Lead S-Pak (WR), thermally enhanced with exposed tab connected to GND. Dimensions per Microchip Drawing C04-1129 Rev A: 4.5 × 6.0 × 1.0 mm, 0.95 mm lead pitch, tab area 3.0 × 4.5 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - EN | Logic enable input | CMOS-compatible control: high ≥2.25V enables regulator; low ≤0.8V forces shutdown with <1 µA supply current |
| 2 - VIN | Power input | Accepts 2.25V–6.0V; must be bypassed with ≥1 µF capacitor within 25 mm of pin for stability |
| 3 - GND | Ground reference | Common return for VIN, VOUT, EN, and FLG; tab is electrically connected to this pin |
| 4 - VOUT | Regulated output | Delivers 3.3V ±1.0%; requires ≥10 µF ceramic/tantalum output capacitor for stability and transient response |
| 5 - FLG | Error flag output | Open-collector output; pulled low (<300 mV) when VOUT drops ≥5% - signals overcurrent or undervoltage fault |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 500 mV max at 1.5A over –40°C to +125°C - enables high-efficiency 3.3V generation from marginal input sources |
| Integrated protection | Thermal shutdown, current limiting (2.25–4.0A), reverse-leakage, and reverse-battery protection - eliminates need for external safety components |
| Ceramic capacitor stability | Stable with ≥10 µF ceramic output cap (X7R/X5R) - reduces board space vs. electrolytic solutions and improves high-frequency PSRR |
| Dual-control interface | Separate EN and FLG pins - allows system-level power sequencing and real-time fault monitoring without polling |
| High precision output | ±1.0% initial tolerance and 0.2% load regulation - ensures reliable operation of 3.3V I/O domains in FPGAs and microcontrollers |
Applications
| PC Add-In Cards | SMPS Post Regulator |
|---|---|
Use Scenario: Powering PCIe interface logic and local memory on expansion cards with tight thermal constraints and variable input rail quality. IC Role / Device Role / Timing Role: Primary 3.3V LDO supplying FPGA I/O banks and transceivers, synchronized to host power-on sequence via EN pin. Use Value: 500 mV dropout allows direct use of 3.8V SMPS output without additional buck stage; FLG pin alerts host controller of rail collapse before data corruption occurs. |
Use Scenario: Cleaning ripple and noise from switching regulator outputs feeding sensitive analog or RF subsystems. IC Role / Device Role / Timing Role: Low-noise, high-PSRR post-regulator converting 5V or 3.6V SMPS output to clean 3.3V for ADC references and clock buffers. Use Value: 80 dB PSRR at 1 kHz (per typical curves) suppresses switching artifacts; ceramic capacitor compatibility avoids ESR-related instability in compact layouts. |
| Battery-Powered IoT Nodes | Industrial PLC I/O Modules |
Use Scenario: Long-life sensor nodes powered by two AA alkaline cells (2.4–3.2V range) requiring regulated 3.3V for MCU and wireless SoC. IC Role / Device Role / Timing Role: Main system regulator with EN controlled by MCU wake signal; FLG monitors brownout during battery depletion. Use Value: Operates down to 2.25V input - extends usable battery life beyond conventional LDOs; <1 µA shutdown current preserves charge during sleep. |
Use Scenario: Distributed I/O modules in factory automation systems where 24V DC bus is locally converted to 3.3V for fieldbus controllers and isolation logic. IC Role / Device Role / Timing Role: Robust local regulator with reverse-leakage and reverse-battery protection against wiring faults and hot-swap events. Use Value: Withstands reverse polarity and load-dump transients up to +6.5V; –40°C to +125°C rating ensures reliability in uncontrolled cabinet environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1703T-3302E/MB | 3.3V fixed, 250 mA max output, 600 mV dropout at 250 mA, SOT-23-5 package | Lower current capability and higher dropout - unsuitable for >500 mA loads or low-input-voltage scenarios | Select only for space-constrained, low-power applications where 1.5A capacity is unnecessary |
| TPS7A2033PDBVR | 3.3V fixed, 300 mA max, 170 mV dropout at 300 mA, ultra-low IQ (6.5 µA), SOT-23-5 | Higher precision (±0.5%), lower IQ, but insufficient current and thermal margin for 1.5A continuous loads | Prefer for always-on, ultra-low-power subsystems; not a functional replacement for MIC37151-3.3WR-TR's 1.5A capability |
Compared with MCP1703T-3302E/MB and TPS7A2033PDBVR, the MIC37151-3.3WR-TR uniquely delivers 1.5A output with ≤500 mV dropout in a thermally robust S-Pak package - essential for high-current digital loads where alternatives require parallel devices or derating.
Availability
MIC37151-3.3WR-TR is available at Aetrix Electronics and suitable for PC add-in cards, SMPS post-regulation, battery-powered IoT nodes, and industrial PLC I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MIC37151-3.3WR-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 MIC37150/1/2/3 family is designed as µCap LDO regulators targeting high-current, low-voltage digital power delivery - specifically optimized for PLDs, DSPs, and microcontrollers in battery, computing, and industrial applications.
FAQ
What is the maximum output current specification for the MIC37151-3.3WR-TR?
The MIC37151-3.3WR-TR guarantees a minimum output current of 1.5A across its full operating temperature range (–40°C to +125°C). This rating is validated under worst-case conditions including 500 mV dropout voltage and thermal limits. The device features foldback current limiting that sustains 2.25A typical short-circuit current before thermal shutdown activates.
Does the MIC37151-3.3WR-TR require an external pull-up resistor on the FLG pin?
Yes, the FLG pin is an open-collector output and requires an external pull-up resistor to a valid logic-high voltage (e.g., 3.3V or 5V). Typical values range from 10 kΩ to 100 kΩ. When a fault occurs (VOUT ≤ 95% of 3.3V), FLG pulls low to ≤300 mV while sinking ≥250 µA - enabling direct interfacing with microcontroller GPIOs or dedicated fault-monitoring circuits.
Can the MIC37151-3.3WR-TR operate with ceramic output capacitors?
Yes, the MIC37151-3.3WR-TR is certified stable with ceramic output capacitors ≥10 µF (X7R or X5R dielectric). For optimal transient response and noise suppression, Microchip recommends ≥47 µF ultra-low-ESR ceramics. Capacitors with Y5V or Z5U dielectrics are discouraged due to excessive capacitance drift over temperature.
What is the input voltage range supported by the MIC37151-3.3WR-TR?
The MIC37151-3.3WR-TR operates from 2.25V to 6.0V input. Its 500 mV dropout at 1.5A means it can maintain regulated 3.3V output with as little as 3.8V input - making it suitable for single-cell Li-ion (3.0–4.2V), two-cell alkaline (2.4–3.2V), and pre-regulated SMPS rails. Absolute maximum VIN is +6.5V.
How does the enable (EN) pin function on the MIC37151-3.3WR-TR?
The EN pin provides logic-level on/off control: applying ≥2.25V enables regulation with ~15 µA input current; applying ≤0.8V disables the output and reduces total supply current to <1 µA. The pin is TTL/CMOS compatible and may be driven directly from microcontrollers or power sequencers without level-shifting.
MIC37151-3.3WR-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SPAK-5 (5 Leads + Tab)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.5V @ 1.5A
- Current - Output:
- 1.5A
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Reverse Polarity
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 5-SPAK
MIC37151-3.3WR-TR FAQ
1.How can I place an order for MIC37151-3.3WR-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC37151-3.3WR-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 MIC37151-3.3WR-TR reliable?
The price and inventory of MIC37151-3.3WR-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC37151-3.3WR-TR is usually 5 days.
3.What payment methods are accepted for MIC37151-3.3WR-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC37151-3.3WR-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC37151-3.3WR-TR?
MIC37151-3.3WR-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC37151-3.3WR-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 MIC37151-3.3WR-TR?
For technical support, including MIC37151-3.3WR-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC37151-3.3WR-TR requirements.
6.How does Aetrix verify that MIC37151-3.3WR-TR is sourced from the original manufacturer or authorized distributors?
All MIC37151-3.3WR-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 MIC37151-3.3WR-TR meets industry standards.
7.What is the process for return or replacement of MIC37151-3.3WR-TR?
All MIC37151-3.3WR-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC37151-3.3WR-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 MIC37151-3.3WR-TR part is unused and in its original packaging.
Return procedure for MIC37151-3.3WR-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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