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Microchip Technology MCP1612-ADJI/MS
- Part No.:
- MCP1612-ADJI/MS
- Manufacturer:
- Microchip Technology
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MCP1612-ADJI/MS.pdf
- Description:
- IC REG BUCK ADJ 1A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:227
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Product details
Overview
MCP1612-ADJI/MS from Microchip Technology is a 1A, 1.4 MHz synchronous buck regulator with integrated P- and N-channel MOSFETs, 0.8V–5.0V adjustable output, 2.7V–5.5V input range, and 100% duty cycle capability for low-input-headroom operation - used in USB-powered devices, DSL routers, and portable computing power rails.
For engineers reviewing the MCP1612-ADJI/MS datasheet, MCP1612-ADJI/MS pinout, MCP1612-ADJI/MS application, or MCP1612-ADJI/MS equivalent, this page delivers verified electrical specs, thermal resistance (θJA = 208°C/W), shutdown current (<0.01 µA), FB reference voltage (0.8 V), and package-specific layout guidance for the 8-pin MSOP variant.
Technical Context
The MCP1612-ADJI/MS implements peak current-mode control with a fixed 1.4 MHz oscillator, enabling fast line/load transient response and stable operation with ceramic output capacitors as low as 4.7 µF. Its dual-ground architecture (AGND/PGND) isolates analog sensing from high-current switching paths.
It integrates undervoltage lockout (UVLO = 2.55 V typ., 200 mV hysteresis), overtemperature shutdown (160°C), cycle-by-cycle current limit (2.3 A peak), soft-start, and 100% duty cycle mode - all without external components beyond the resistor divider, inductor, and input/output capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.4 MHz fixed - enables compact 3.3 µH inductor and ≤10 µF ceramic output capacitor. |
| Input Voltage Range | 2.7V to 5.5V - supports single-cell Li-ion, 2–3-cell NiMH/alkaline, and +3.3V/+5V distributed rails. |
| Output Current | 1 A continuous - sufficient for core logic, I/O, or interface ICs in portable and networking gear. |
| Feedback Reference | 0.8 V ±2.5% - sets output via external resistor divider; enables precise 1.2V, 1.8V, 2.5V, 3.3V, or 5.0V regulation. |
| Shutdown Current | <0.01 µA typical - preserves battery life in always-on or sleep-mode applications. |
| Thermal Resistance | θJA = 208°C/W (MSOP) - requires moderate copper area and thermal vias for 1A full-load operation at +85°C ambient. |
| Protection Features | UVLO (2.55 V), thermal shutdown (160°C), peak current limit (2.3 A), soft-start - no external fault-handling circuitry needed. |
Pinout & Package
Package: 8-pin MSOP (3.00 mm × 3.00 mm × 1.09 mm), RoHS-compliant, exposed pad not present (unlike DFN variant). Thermal resistance θJA = 208°C/W on standard 4-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Input power supply connection | Accepts 2.7–5.5V; requires 10 µF ceramic bypass to PGND to suppress switching noise. |
| 2 - VCC | Analog bias supply | Internally derived from VIN; decoupled via 10 Ω resistor + 0.1 µF capacitor to reduce switching coupling. |
| 3 - SHDN | Logic-controlled enable/disable | Active-high (>45% of VIN); pulls IQ below 0.01 µA in shutdown - ideal for host-processor power sequencing. |
| 4 - COMP | Error amplifier output | Connects to RC network (e.g., 25 kΩ + 1000 pF) for loop compensation; critical for stability across load/temperature. |
| 5 - FB | Output voltage sense input | Compares divided VOUT to 0.8 V internal reference; high-impedance (1 nA bias) - sensitive to PCB noise. |
| 6 - AGND | Analog ground reference | Return for FB, COMP, and internal reference; must be isolated from PGND except at single-point near CIN. |
| 7 - PGND | Power ground return | High-current return for VIN, LX, and inductor; short, low-inductance trace required to minimize EMI and voltage spikes. |
| 8 - LX | Switch node connection | Drives buck inductor; carries full AC+DC current - must connect directly with minimal trace length and area. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous switches | P- and N-channel MOSFETs (RDS(on) ≈ 300 mΩ each) eliminate external diode and reduce conduction loss by >30% vs. asynchronous designs. |
| 100% duty cycle operation | Enables VOUT regulation down to VIN – IOUT×(RDS(on,P) + RINDUCTOR) - essential for Li-ion battery discharge down to 2.7V while maintaining 1.8V output. |
| Fast dynamic response | Settles within 50 µs for 100 mA → 800 mA load steps (VOUT = 1.8V) - minimizes required output capacitance and improves system reliability under burst loads. |
| Dual-ground separation | Independent AGND and PGND pins prevent switching noise from corrupting feedback accuracy - eliminates need for ferrite beads or split-plane compromises. |
| Robust protection suite | UVLO with 200 mV hysteresis prevents brownout oscillation; thermal shutdown with 9°C hysteresis enables automatic recovery without host intervention. |
Applications
| Portable Computing Power Rail | DSL/Router Core Supply |
|---|---|
Use Scenario: Regulating 3.3V input to 1.2V/1.8V for CPU I/O or memory interface in ultra-thin notebooks and tablets. IC Role / Device Role / Timing Role: Primary point-of-load (POL) buck converter delivering regulated, low-noise DC power with fast transient response. Use Value: Enables use of small 3.3 µH inductors and 10 µF ceramic capacitors - reduces solution footprint by >40% vs. lower-frequency alternatives. |
Use Scenario: Generating stable 3.3V or 2.5V from 5V wall adapter in DSL modems and SOHO routers. IC Role / Device Role / Timing Role: High-efficiency intermediate bus converter powering PHY, MAC, and switch fabric ICs. Use Value: 1.4 MHz switching avoids audible noise and simplifies EMI filtering - meets FCC Class B without shielding. |
| USB-Powered Peripheral | Medical Instrument Low-Power Rail |
Use Scenario: Converting 5V USB power to 1.8V for microcontroller, sensor, or RF transceiver in portable diagnostic tools. IC Role / Device Role / Timing Role: Input-supervised buck regulator with UVLO and shutdown control synchronized to host USB enumeration. Use Value: Shutdown current <0.01 µA extends battery backup runtime; 100% duty cycle maintains output during USB suspend (VIN drops to ~4.4V). |
Use Scenario: Providing isolated, low-noise 3.3V rail for analog front-end and ADC in handheld ultrasound or glucose meters. IC Role / Device Role / Timing Role: Precision-regulated power source with tight FB reference (±2.5%) and low output ripple (<10.5 mV). Use Value: Dual-ground architecture and 0.8V reference minimize measurement offset drift - supports 12-bit+ effective resolution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62130ARGTR | 3–17V input, 3A output, 2.5MHz switching, integrated compensation - higher voltage range but larger package (QFN-16) and no 100% duty cycle. | Better suited for industrial 12V input systems; less optimal for Li-ion (2.7–5.5V) due to minimum input limitation. | Select TPS62130ARGTR only when input exceeds 5.5V or >1.5A output is required; MCP1612-ADJI/MS remains superior for space-constrained, battery-fed designs. |
| RT8059GJ6 | 2.5–5.5V input, 1A output, 1.5MHz, 0.6V reference, no integrated P-FET - requires external high-side switch and adds complexity. | Lacks integrated synchronous rectification and 100% duty cycle - higher BOM count and reduced efficiency below 3V input. | Choose RT8059GJ6 only if 0.6V reference is mandatory for sub-1V core supplies; MCP1612-ADJI/MS offers simpler design, better light-load efficiency, and proven battery compatibility. |
Compared with TPS62130ARGTR and RT8059GJ6, the MCP1612-ADJI/MS uniquely combines 2.7V minimum input, 100% duty cycle, integrated dual MOSFETs, and MSOP packaging - making it the most compact, lowest-BOM, and battery-optimized 1A buck solution in its class.
Availability
MCP1612-ADJI/MS is available at Aetrix Electronics and suitable for portable computing, DSL infrastructure, USB peripheral, medical instrument, and set-top box applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance.
Supply support for MCP1612-ADJI/MS 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 leading provider of microcontrollers, analog, interface, and power management ICs, serving automotive, industrial, consumer, and communications markets with vertically integrated silicon and software solutions.
The MCP1612 product line delivers highly integrated, frequency-fixed synchronous buck regulators optimized for space-constrained, battery-powered applications where efficiency, small size, and robust protection are critical.
FAQ
What is the maximum output current capability of the MCP1612-ADJI/MS?
The MCP1612-ADJI/MS delivers up to 1 A of continuous output current under typical conditions (TA = +25°C, 2-layer board). At elevated ambient temperatures or with limited copper area, derating applies - e.g., ~750 mA at +85°C ambient on a standard 4-layer board due to θJA = 208°C/W. The device includes cycle-by-cycle current limiting at 2.3 A peak to protect against short-circuit faults.
Does the MCP1612-ADJI/MS support 100% duty cycle operation, and why does it matter?
Yes, the MCP1612-ADJI/MS supports true 100% duty cycle operation, allowing VOUT regulation even when VIN approaches VOUT. This is critical for Li-ion battery applications where input voltage drops to 2.7V while maintaining 1.8V or 2.5V output - avoiding dropout and ensuring uninterrupted system operation during deep discharge.
What are the key layout requirements for stable operation of the MCP1612-ADJI/MS?
Stable operation requires strict separation of AGND and PGND - connect them at a single point near the input capacitor. Keep the VIN–PGND–LX–inductor loop as short and wide as possible. Route FB away from noisy nodes, and place the 0.1 µF VCC bypass capacitor within 2 mm of the VCC pin. Use thermal vias under the MSOP body if operating near 1A continuous load.
Can the MCP1612-ADJI/MS be used with ceramic output capacitors, and what is the minimum recommended value?
Yes, the MCP1612-ADJI/MS is fully compatible with ceramic output capacitors. The minimum recommended value is 4.7 µF for basic ripple suppression (e.g., <10 mV at 1A load), though 10 µF is typical for optimal transient response. Ceramic caps are preferred due to low ESR; tantalum or aluminum electrolytics may be used but require careful ESR selection to avoid instability.
How does the shutdown function work on the MCP1612-ADJI/MS, and what is its quiescent current in that state?
The SHDN pin is active-high: a voltage >45% of VIN enables regulation; <15% of VIN forces shutdown. In shutdown, both internal MOSFETs turn off, LX floats, and total device current drops to <0.01 µA typical - verified across -40°C to +85°C. This ultra-low shutdown current makes MCP1612-ADJI/MS ideal for battery-backed systems requiring multi-year shelf life.
MCP1612-ADJI/MS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 5V
- Current - Output:
- 1A
- Frequency - Switching:
- 1.4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
MCP1612-ADJI/MS FAQ
1.How can I place an order for MCP1612-ADJI/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1612-ADJI/MS 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 MCP1612-ADJI/MS reliable?
The price and inventory of MCP1612-ADJI/MS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1612-ADJI/MS is usually 5 days.
3.What payment methods are accepted for MCP1612-ADJI/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1612-ADJI/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1612-ADJI/MS?
MCP1612-ADJI/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1612-ADJI/MS 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 MCP1612-ADJI/MS?
For technical support, including MCP1612-ADJI/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1612-ADJI/MS requirements.
6.How does Aetrix verify that MCP1612-ADJI/MS is sourced from the original manufacturer or authorized distributors?
All MCP1612-ADJI/MS 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 MCP1612-ADJI/MS meets industry standards.
7.What is the process for return or replacement of MCP1612-ADJI/MS?
All MCP1612-ADJI/MS units undergo pre-shipment inspection (PSI). If there is an issue with MCP1612-ADJI/MS, 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 MCP1612-ADJI/MS part is unused and in its original packaging.
Return procedure for MCP1612-ADJI/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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