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Microchip Technology MIC37151-2.5WR
- Part No.:
- MIC37151-2.5WR
- Manufacturer:
- Microchip Technology
- Package:
- SPAK-5 (5 Leads + Tab)
- Datasheet:
-
MIC37151-2.5WR.pdf
- Description:
- IC REG LINEAR 2.5V 1.5A SPAK-5
- Quantity:
- Payment:
- Shipping:
Inventory:179
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Product details
Overview
MIC37151-2.5WR from Microchip Technology is a 1.5A fixed-output low-dropout linear voltage regulator in 5-lead S-Pak (WR) package, delivering 2.5V with ±1.0% initial tolerance and 500 mV max dropout at 1.5A load. It features logic-controlled shutdown, open-collector error flag (FLG), ceramic-capacitor stability, and operates from 2.25V to 6.0V input - ideal for post-regulation of 3.3V SMPS rails powering microcontrollers or DSPs.
For engineers reviewing the MIC37151-2.5WR datasheet, MIC37151-2.5WR pinout, MIC37151-2.5WR application, or MIC37151-2.5WR equivalent, key selection criteria include guaranteed 1.5A output current, thermal/current-limit protection, FLG fault signaling capability, and compatibility with low-ESR ceramic output capacitors ≥10 μF.
Technical Context
The MIC37151-2.5WR uses a Super ßeta PNP pass transistor architecture enabling ultra-low dropout (≤500 mV at full load over –40°C to +125°C) and high precision (±1.0% VOUT accuracy). Its enable (EN) input accepts TTL/CMOS logic levels (VIH ≥ 2.25V, VIL ≤ 0.8V) and draws only 15 µA when active.
The FLG pin is an open-collector output that pulls low when VOUT drops ≥5% below nominal (i.e., ≤2.375V for 2.5V output), sinking up to 10 mA during fault conditions. Ground current remains stable at 17–30 mA across full load (1.5A) and temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5V ±1.0% at 10 mA; ±2.0% over full load (10 mA–1.5A) and input range |
| Max Dropout Voltage | 500 mV at 1.5A load and full temperature range - enables 3.0V→2.5V conversion without dropout |
| Input Voltage Range | 2.25V to 6.0V - supports single-cell Li-ion, 3.3V/5V rails, and battery-backed systems |
| Output Current | Guaranteed minimum 1.5A - sufficient for PLDs, microcontrollers, and DSPs requiring stable low-voltage supply |
| Ground Current | 17–30 mA at 1.5A load - low quiescent current preserves efficiency in high-current LDO applications |
| Enable Threshold | VIL ≤ 0.8V (shutdown), VIH ≥ 2.25V (enable); input leakage ≤4 µA - compatible with 3.3V/2.5V logic interfaces |
| Error Flag Threshold | Active-low FLG asserts when VOUT falls to 95% of nominal (≤2.375V); hysteresis ensures noise immunity |
Pinout & Package
Package: 5-lead S-Pak (WR), thermally enhanced with exposed tab connected to GND. Low-profile surface-mount design optimized for PCB heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - EN | Logic enable input | CMOS-compatible control pin; high = regulator enabled, low = shutdown (ISHDN ≤ 1.0 µA) |
| 2 - VIN | Power input | Supplies regulated output; accepts 2.25V–6.0V; requires ≥1 µF input capacitor near pin |
| 3 - GND | Ground reference | Common return path; tab is internally bonded to this pin for thermal conduction |
| 4 - VOUT | Regulated output | Delivers fixed 2.5V; stable with ≥10 µF ceramic capacitor (47 µF recommended) |
| 5 - FLG | Error flag output | Open-collector output; sinks ≥10 mA when VOUT < 2.375V; requires external pull-up resistor |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 500 mV max at 1.5A over –40°C to +125°C - enables operation from marginal input voltages like 3.0V |
| Ceramic capacitor stability | Stable with ≥10 µF X7R/X5R ceramic output cap - eliminates need for bulky tantalum or electrolytic capacitors |
| Integrated fault signaling | Open-collector FLG pin alerts system controller of undervoltage condition before functional failure occurs |
| Thermal & current protection | Auto-recovery thermal shutdown and linear current limiting (2.25–4.0A) prevent damage during overload or ambient rise |
| Reverse-leakage protection | Prevents reverse current flow from VOUT to VIN when input is removed - critical for battery backup and hot-swap systems |
Applications
| PC Add-In Cards | SMPS Post Regulator |
|---|---|
Use Scenario: Powering FPGA I/O banks or PCIe endpoint logic on expansion cards with tight space constraints and variable input rail quality. IC Role / Device Role / Timing Role: Fixed 2.5V LDO providing clean, low-noise local regulation downstream of noisy switching converters. Use Value: 500 mV dropout allows direct use of 3.3V rail without intermediate buck stage; FLG enables host firmware to detect power integrity loss before data corruption. | Use Scenario: Tight-tolerance post-regulation of 3.3V switch-mode supply feeding sensitive analog front-ends or ADC reference circuits. IC Role / Device Role / Timing Role: Low-PSRR, low-noise linear regulator suppressing high-frequency switching ripple and transient noise. Use Value: Stable 2.5V output with ±1.0% accuracy ensures consistent ADC reference voltage; ceramic capacitor compatibility simplifies layout and reduces BOM count. |
| Battery Charger Management | Low-Voltage Digital IC Supply |
Use Scenario: Providing regulated 2.5V bias to charge controller ICs and fuel gauges in portable devices powered by single-cell Li-ion (2.7–4.2V). IC Role / Device Role / Timing Role: Input-tracking LDO maintaining constant output while input decays from 4.2V to 2.25V cutoff. Use Value: Guaranteed 1.5A output supports fast-charge ICs; EN pin enables system-level power sequencing; FLG signals battery depletion or charger fault. | Use Scenario: Supplying core voltage to low-power microcontrollers (e.g., PIC, ARM Cortex-M0+) operating at 2.5V in industrial sensor nodes. IC Role / Device Role / Timing Role: Primary voltage regulator delivering precise, low-noise 2.5V to digital logic with minimal external components. Use Value: 17–30 mA ground current minimizes total system power draw; –40°C to +125°C junction rating ensures reliability in uncontrolled environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MIC37151-2.5YM | Same electrical specs, but in 8-lead SOIC (YM) package with different pinout and no exposed thermal pad | Lacks integrated thermal performance of WR package; suited for prototyping or lower-power layouts where thermal mass is less critical | Select MIC37151-2.5YM only if SOIC footprint is required and thermal derating can be accommodated via board copper. |
| TLS850F25TAV50 | Automotive-grade 2.5V LDO (1.2A), AEC-Q100 qualified, higher dropout (600 mV), integrated watchdog and reset | Designed for automotive body electronics; includes safety features not present in MIC37151-2.5WR | Choose TLS850F25TAV50 only for automotive applications requiring ASIL-B compliance and functional safety support. |
Compared with MIC37151-2.5YM and TLS850F25TAV50, the MIC37151-2.5WR delivers superior thermal performance via its S-Pak WR package, supports higher continuous current (1.5A vs. 1.2A), and offers simpler integration for industrial and computing applications where automotive qualification is unnecessary.
Availability
MIC37151-2.5WR is available at Aetrix Electronics and suitable for PC add-in cards, SMPS post-regulation, and battery-powered embedded systems requiring stable component supply, extended temperature operation, and reliable fault signaling.
Supply support for MIC37151-2.5WR 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 provider of microcontroller, mixed-signal, analog, and Flash-IP solutions, serving industrial, automotive, consumer, and communications markets with high-reliability semiconductor products.
The MIC37150/1/2/3 family was designed as µCap LDO regulators targeting high-current, low-voltage digital ICs - emphasizing ultra-low dropout, ceramic-capacitor compatibility, and integrated protection for space-constrained, thermally demanding applications.
FAQ
What is the maximum input voltage rating for the MIC37151-2.5WR?
The MIC37151-2.5WR has an absolute maximum input voltage rating of +6.5V, but its specified operating input voltage range is +2.25V to +6.0V. Operation above 6.0V risks exceeding safe power dissipation limits and may trigger thermal shutdown. For inputs >6.0V, Microchip recommends the MIC39xxx series LDOs instead of the MIC37151-2.5WR.
Does the MIC37151-2.5WR require an external pull-up resistor on the FLG pin?
Yes, the MIC37151-2.5WR FLG pin is an open-collector output and requires an external pull-up resistor to a valid logic-high voltage (e.g., VIN or VOUT). Typical values range from 10 kΩ to 100 kΩ. Without this resistor, the FLG signal cannot assert a valid high state, rendering fault detection nonfunctional. This requirement is explicitly defined in the MIC37151-2.5WR datasheet Section 4.6.
Can the MIC37151-2.5WR operate with a 10 μF ceramic output capacitor?
Yes, the MIC37151-2.5WR is specified to operate stably with a minimum 10 μF ceramic output capacitor, though 47 μF is recommended for optimal transient response and noise suppression. The device's µCap architecture eliminates ESR dependency, allowing use of low-ESR X7R/X5R ceramics - unlike legacy LDOs that require 200 mΩ–2 Ω ESR tantalum capacitors.
What is the shutdown current consumption of the MIC37151-2.5WR?
The MIC37151-2.5WR draws ≤1.0 µA of ground current when disabled via the EN pin (VEN ≤ 0.5V, VIN = VOUT + 1V). This ultra-low shutdown current enables long-term battery retention in portable systems. The specification is validated across the full –40°C to +125°C junction temperature range and is listed in the Electrical Characteristics table on DS20006491A-page 3.
Is the MIC37151-2.5WR pin-compatible with other members of the MIC37150/1/2/3 family?
No, the MIC37151-2.5WR is not pin-compatible with MIC37150, MIC37152, or MIC37153 variants. Its 5-lead S-Pak WR package has unique pin assignments: Pin 1 = EN, Pin 2 = VIN, Pin 3 = GND, Pin 4 = VOUT, Pin 5 = FLG. Substituting another variant without verifying pin mapping risks incorrect connections, latch-up, or permanent damage to the MIC37151-2.5WR or host system.
MIC37151-2.5WR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SPAK-5 (5 Leads + Tab)
- Packaging:
- Tube
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 2.5V
- 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
MIC37151-2.5WR FAQ
1.How can I place an order for MIC37151-2.5WR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC37151-2.5WR 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 MIC37151-2.5WR reliable?
The price and inventory of MIC37151-2.5WR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC37151-2.5WR is usually 5 days.
3.What payment methods are accepted for MIC37151-2.5WR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC37151-2.5WR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC37151-2.5WR?
MIC37151-2.5WR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC37151-2.5WR 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 MIC37151-2.5WR?
For technical support, including MIC37151-2.5WR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC37151-2.5WR requirements.
6.How does Aetrix verify that MIC37151-2.5WR is sourced from the original manufacturer or authorized distributors?
All MIC37151-2.5WR 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 MIC37151-2.5WR meets industry standards.
7.What is the process for return or replacement of MIC37151-2.5WR?
All MIC37151-2.5WR units undergo pre-shipment inspection (PSI). If there is an issue with MIC37151-2.5WR, 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 MIC37151-2.5WR part is unused and in its original packaging.
Return procedure for MIC37151-2.5WR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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