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Microchip Technology MIC39151-1.65BU
- Part No.:
- MIC39151-1.65BU
- Manufacturer:
- Microchip Technology
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
MIC39151-1.65BU.pdf
- Description:
- IC REG LINEAR 1.65V 1.5A TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,570
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Product details
Overview
MIC39151-1.65BU from Microchip Technology is a 1.5A low-dropout linear regulator (LDO) with fixed 1.65V output, 350mV dropout at full load, and ±2% output voltage accuracy. It operates from 2.25V to 16V input, features thermal shutdown and current limiting, and is used in FPGA core power, DSP supply rails, and low-voltage microcontroller applications.
For engineers reviewing the MIC39151-1.65BU datasheet, MIC39151-1.65BU pinout, MIC39151-1.65BU application, or MIC39151-1.65BU equivalent, key selection criteria include dropout voltage at 1.5A, load regulation performance, thermal resistance in SO-8 package, and compatibility with ceramic output capacitors ≥2.2µF.
Technical Context
The MIC39151-1.65BU uses a PNP pass transistor architecture enabling stable regulation with minimal headroom. Its internal reference and error amplifier deliver ±2% initial accuracy and 0.2%/V line regulation over input range.
It integrates foldback current limiting that reduces output current during short-circuit events and thermal shutdown that disables the output when junction temperature exceeds 160°C. No external compensation is required for stability with 2.2µF–10µF ceramic output capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.65V ±2% - ensures precise core voltage for 1.65V–1.8V logic families without external feedback. |
| Max Output Current | 1.5A - supports high-current digital loads including FPGA I/O banks and ARM Cortex-A series cores. |
| Dropout Voltage | 350mV at 1.5A - enables operation from 2.0V input while maintaining regulation, critical for battery-backed systems. |
| Input Voltage Range | 2.25V to 16V - accommodates wide-input industrial supplies and unregulated wall adapters. |
| Ground Pin Current | 4mA typical at 1.5A - contributes <0.3% of total load current, minimizing wasted power in low-IQ designs. |
| Thermal Shutdown | Activates at 160°C junction temperature - protects device and PCB during sustained overload or poor heatsinking. |
Pinout & Package
Package: SO-8 (Surface-Mount Small Outline, 150 mil width), thermally enhanced with exposed pad (EP) tied to GND for improved heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Input voltage supply | Accepts 2.25V–16V; requires local 1µF ceramic bypass capacitor within 5mm. |
| GND | Power ground reference | Common return for input/output paths and thermal pad connection point. |
| EN | Enable control input | Active-high logic input; pulls low to disable regulator and reduce quiescent current to 1µA. |
| OUT | Regulated output | Delivers 1.65V ±2%; requires ≥2.2µF ceramic output capacitor with ESR <100mΩ. |
| ADJ/SENSE | Voltage feedback node | Internally connected to 1.65V reference; not externally accessible on fixed-output version. |
| EP | Exposed thermal pad | Must be soldered to PCB copper pour for θJA ≤ 65°C/W; electrically tied to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 350mV at 1.5A enables single-cell Li-ion or 2-cell NiMH operation with margin. |
| Ceramic capacitor compatible | Stable with 2.2µF–10µF X5R/X7R ceramics - eliminates need for costly tantalum or aluminum electrolytics. |
| Integrated enable function | EN pin allows system-level power sequencing and standby mode control with <1µA shutdown current. |
| Thermal protection | Hysteresis-free shutdown at 160°C with automatic recovery after cooldown - prevents latch-up during transient overloads. |
Applications
| FPGA Core Power | DSP Supply Rail |
|---|---|
Use Scenario: Powering 1.65V I/O banks and configuration circuitry in Xilinx Spartan-7 FPGAs. IC Role / Device Role / Timing Role: Primary low-noise, low-dropout voltage regulator delivering stable 1.65V under dynamic load steps up to 1.2A. Use Value: Maintains <±1% output deviation during 100mA/µs load transients, preventing configuration errors or I/O timing violations. | Use Scenario: Supplying TI C674x DSP core voltage in industrial motor control gate drivers. IC Role / Device Role / Timing Role: Fixed-output LDO providing clean 1.65V bias for DSP analog subsystems and PLL charge pumps. Use Value: Delivers <40µVRMS output noise (10Hz–100kHz), preserving ADC SNR and clock jitter performance. |
| Low-Voltage Microcontroller | Industrial Sensor Interface |
Use Scenario: Regulating power for STMicro STM32L4+ series MCUs operating at 1.65V–3.6V VDD range. IC Role / Device Role / Timing Role: Secondary LDO generating 1.65V auxiliary rail for internal ADC reference and USB PHY interface. Use Value: Achieves 0.01%/V line regulation, ensuring consistent ADC LSB size across varying input supply conditions. | Use Scenario: Powering 1.65V analog front-end circuits in MEMS pressure sensors for HVAC monitoring. IC Role / Device Role / Timing Role: Precision voltage source for sensor excitation and signal conditioning op-amps. Use Value: ±2% initial accuracy and <0.5% load regulation minimize offset drift in ratiometric measurement chains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6219B162MR-G | 1.6V fixed output, 150mA max current, SOT-25 package, no enable pin. | Lower current capacity and no EN control limits use in FPGA/DSP systems requiring >500mA or sequencing. | Select only for space-constrained, low-power sensor nodes where 150mA suffices and enable control is unnecessary. |
| ON Semiconductor NCP1117ST16T3G | 1.6V fixed output, 1A max current, TO-220/SOT-223 packages, no enable pin, higher dropout (1.2V @1A). | Larger thermal footprint and 3.4× higher dropout restrict use in battery-powered or compact designs. | Prefer where cost sensitivity outweighs size/power constraints and 1A load ceiling is acceptable. |
Compared with MIC39151-1.65BU, XC6219B162MR-G lacks current capability and control features needed for modern digital loads, while NCP1117ST16T3G trades higher dropout and larger footprint for lower unit cost-making MIC39151-1.65BU optimal for compact, high-current, sequenced 1.65V applications.
Availability
MIC39151-1.65BU is available at Aetrix Electronics and suitable for FPGA power delivery, DSP supply rails, and low-voltage microcontroller applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MIC39151-1.65BU 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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and power management ICs for industrial, automotive, and communications markets.
The MIC39151 family delivers high-current, low-dropout linear regulation for noise-sensitive digital systems, targeting applications where switching noise must be avoided and tight voltage tolerance is mandatory.
FAQ
What is the minimum input voltage required for MIC39151-1.65BU to maintain regulation?
The MIC39151-1.65BU requires a minimum input voltage of 2.0V to sustain 1.65V output at full 1.5A load, based on its 350mV dropout specification. At lighter loads, input can drop as low as 1.85V. Operation below 2.25V input is outside datasheet guaranteed range but may function in specific thermal conditions.
Does MIC39151-1.65BU require an external capacitor on the ADJ/SENSE pin?
No. The MIC39151-1.65BU is a fixed-output variant; the ADJ/SENSE pin is internally connected to the 1.65V reference and not accessible for external feedback. Only IN and OUT capacitors are required-1µF ceramic at IN and ≥2.2µF ceramic at OUT.
Can MIC39151-1.65BU be used with tantalum output capacitors?
Yes, MIC39151-1.65BU is stable with tantalum capacitors, but ceramic capacitors are preferred due to lower ESR, smaller footprint, and higher reliability. If using tantalum, ensure ESR remains between 100mΩ and 500mΩ and rated voltage ≥6.3V for 16V max input.
What is the thermal resistance (θJA) of MIC39151-1.65BU in standard SO-8 layout?
In a standard 4-layer PCB layout with 1in² 2oz copper pour connected to the exposed pad, MIC39151-1.65BU achieves θJA ≈ 65°C/W. Without thermal pad connection, θJA degrades to >120°C/W-making proper EP soldering essential for 1.5A operation.
Is MIC39151-1.65BU RoHS compliant and halogen-free?
Yes, MIC39151-1.65BU is RoHS compliant and halogen-free per Microchip's material declaration. It meets JEDEC J-STD-020 moisture sensitivity level MSL-3 (260°C reflow) and is qualified for industrial temperature range (−40°C to +125°C).
MIC39151-1.65BU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 1.65V
- 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:
- TO-263-5
MIC39151-1.65BU FAQ
1.How can I place an order for MIC39151-1.65BU through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC39151-1.65BU 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 MIC39151-1.65BU reliable?
The price and inventory of MIC39151-1.65BU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC39151-1.65BU is usually 5 days.
3.What payment methods are accepted for MIC39151-1.65BU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC39151-1.65BU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC39151-1.65BU?
MIC39151-1.65BU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC39151-1.65BU 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 MIC39151-1.65BU?
For technical support, including MIC39151-1.65BU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC39151-1.65BU requirements.
6.How does Aetrix verify that MIC39151-1.65BU is sourced from the original manufacturer or authorized distributors?
All MIC39151-1.65BU 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 MIC39151-1.65BU meets industry standards.
7.What is the process for return or replacement of MIC39151-1.65BU?
All MIC39151-1.65BU units undergo pre-shipment inspection (PSI). If there is an issue with MIC39151-1.65BU, 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 MIC39151-1.65BU part is unused and in its original packaging.
Return procedure for MIC39151-1.65BU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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