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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Microchip Technology MCP1612-ADJI/MF

Name: MCP1612-ADJI/MF
Brand: Microchip Technology
SKU: MCP1612-ADJI/MF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MCP1612-ADJI/MF

Manufacturer:: Microchip Technology

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 8-VDFN Exposed Pad

Datasheet:: MCP1612-ADJI/MF.pdf

Description:: IC REG BUCK ADJ 1A 8DFN

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Product details

Overview

MCP1612-ADJI/MF 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-voltage operation - used in USB-powered devices, DSL routers, and portable computing power rails.

For engineers reviewing the MCP1612-ADJI/MF datasheet, MCP1612-ADJI/MF pinout, MCP1612-ADJI/MF application, or MCP1612-ADJI/MF equivalent, this page delivers verified electrical specs, thermal resistance data (θ_JA = 41°C/W for DFN), protection thresholds (UVLO = 2.55V typ., T_SHD = 160°C), and layout-critical ground separation (AGND/PGND) guidance.

Technical Context

The MCP1612-ADJI/MF implements fixed-frequency peak current mode control with a 1.4 MHz internal oscillator, enabling fast transient response and stable loop behavior using only external RC compensation on the COMP pin. Its architecture integrates both high-side P-channel and low-side N-channel MOSFETs with R_DS(on) ≤ 300 mΩ each, supporting continuous 1A output without external switches.

It features dual ground domains (AGND for precision feedback, PGND for high-current switching return), 0.8V ±2% internal reference at FB, and cycle-by-cycle overcurrent protection triggered at +2.3A peak inductor current - all operating across –40°C to +85°C ambient with junction temperature monitoring up to +125°C continuous.

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 alkaline/NiMH, and 5V/3.3V bus inputs)
Output Current	1A continuous (with thermal derating per θ_JA = 41°C/W in 3×3 mm DFN package)
Feedback Reference	0.8V ±2% (sets output via resistor divider; enables 0.8V–5.0V regulation with <0.5%/V line regulation)
Shutdown Current	<0.01 µA typical (enables ultra-low-power battery hold-up in portable systems)
UVLO Threshold	2.55V typical with 200 mV hysteresis (prevents erratic startup during brown-out conditions)
Thermal Shutdown	160°C typical with 9°C hysteresis (auto-restarts at ~151°C; protects against sustained overload)

Pinout & Package

Package: 8-pin DFN (3 mm × 3 mm × 0.9 mm), exposed thermal pad, RoHS-compliant, JEDEC M0-229 compliant.

Pin/Terminal	Circuit Role	Design Meaning
VIN	Primary input voltage supply	Accepts 2.7–5.5V; requires 10 µF ceramic bypass to PGND; powers internal regulators and switches
VCC	Analog bias supply	Filtered internal rail derived from VIN; decoupled with 0.1 µF ceramic and 10 Ω series resistor to reduce switching noise coupling
SHDN	Logic-controlled enable/disable	Active-high input (≥45% VIN); pulls IQ to <0.01 µA in shutdown; disables both MOSFETs
COMP	Error amplifier output	Connects external RC network (e.g., 25 kΩ + 1000 pF) to stabilize control loop bandwidth and phase margin
FB	Output voltage sensing node	Compares divided VOUT against 0.8V reference; sets regulation point; bias current <1 nA minimizes divider error
AGND	Analog ground reference	Return for FB, COMP, and internal reference; must be isolated from high-current PGND except at single-point bulk capacitor
PGND	Power ground return	High-current return path for VIN, LX, and inductor; requires short, low-inductance trace to minimize EMI and voltage spikes
LX	Switch node	Connects directly to buck inductor; carries full switching current (0–2.3A peak); demands minimal trace length and area

Key Features

Feature	Design Value
Integrated synchronous MOSFETs	P- and N-channel switches with ≤300 mΩ R_DS(on) eliminate external FETs and reduce BOM count
100% duty cycle operation	Enables dropout-free regulation down to VOUT ≈ VIN − I_OUT×(R_DS(on,P) + R_INDUCTOR) for low-headroom battery apps
Fast dynamic load response	Minimizes required output capacitance (as low as 4.7 µF ceramic) due to high-bandwidth current-mode control
Dual ground architecture	Separate AGND and PGND pins prevent switching noise from corrupting feedback accuracy and stability
Comprehensive protection suite	Includes UVLO, thermal shutdown, cycle-by-cycle overcurrent, and soft-start - no external components needed

Applications

Network Interface Card Power	USB-Powered Peripheral
Use Scenario: Providing regulated 3.3V or 1.2V rails to PHY, MAC, and interface logic on PCIe/PCI add-in cards with tight board space. IC Role / Device Role / Timing Role: Primary DC-DC step-down regulator delivering clean, low-noise 1A output from 5V PCIe slot or auxiliary 3.3V supply. Use Value: Enables compact layout with 3.3 µH inductor and 10 µF ceramic output cap; 1.4 MHz switching avoids audible noise and EMI in sensitive comms circuits.	Use Scenario: Powering FPGA I/O banks, microcontroller cores, or sensor interfaces in bus-powered USB 2.0/3.0 devices. IC Role / Device Role / Timing Role: Efficient buck converter converting 5V USB VBUS to 1.8V or 1.2V core voltage with shutdown control tied to USB suspend signaling. Use Value: Sub-0.01 µA shutdown current extends battery backup time; 100% duty cycle supports operation down to 2.7V input during USB voltage sag.
DSL/FTTH Modem Core Supply	Medical Handheld Instrument
Use Scenario: Generating stable 1.2V for SoC processors and 3.3V for analog front-end in residential broadband gateways. IC Role / Device Role / Timing Role: Main system regulator handling dynamic load steps from bursty Ethernet/DSL traffic and Wi-Fi coexistence. Use Value: Fast load transient response (<50 µs recovery) prevents brownout resets; integrated soft-start eliminates inrush current that could trip upstream USB or PoE limiters.	Use Scenario: Supplying precision analog circuitry (ADC drivers, op-amps) and low-power MCU in battery-operated diagnostic tools. IC Role / Device Role / Timing Role: Primary power stage delivering tightly regulated, low-ripple 3.3V from single Li-ion cell with thermal monitoring for patient-safety compliance. Use Value: 0.8V reference tolerance (±2%) and <0.25% load regulation ensure ADC reference stability; thermal shutdown at 160°C meets IEC 60601 creepage/derating requirements.

Network Interface Card Power

USB-Powered Peripheral

Use Scenario: Providing regulated 3.3V or 1.2V rails to PHY, MAC, and interface logic on PCIe/PCI add-in cards with tight board space.

IC Role / Device Role / Timing Role: Primary DC-DC step-down regulator delivering clean, low-noise 1A output from 5V PCIe slot or auxiliary 3.3V supply.

Use Value: Enables compact layout with 3.3 µH inductor and 10 µF ceramic output cap; 1.4 MHz switching avoids audible noise and EMI in sensitive comms circuits.

Use Scenario: Powering FPGA I/O banks, microcontroller cores, or sensor interfaces in bus-powered USB 2.0/3.0 devices.

IC Role / Device Role / Timing Role: Efficient buck converter converting 5V USB VBUS to 1.8V or 1.2V core voltage with shutdown control tied to USB suspend signaling.

Use Value: Sub-0.01 µA shutdown current extends battery backup time; 100% duty cycle supports operation down to 2.7V input during USB voltage sag.

DSL/FTTH Modem Core Supply

Medical Handheld Instrument

Use Scenario: Generating stable 1.2V for SoC processors and 3.3V for analog front-end in residential broadband gateways.

IC Role / Device Role / Timing Role: Main system regulator handling dynamic load steps from bursty Ethernet/DSL traffic and Wi-Fi coexistence.

Use Value: Fast load transient response (<50 µs recovery) prevents brownout resets; integrated soft-start eliminates inrush current that could trip upstream USB or PoE limiters.

Use Scenario: Supplying precision analog circuitry (ADC drivers, op-amps) and low-power MCU in battery-operated diagnostic tools.

IC Role / Device Role / Timing Role: Primary power stage delivering tightly regulated, low-ripple 3.3V from single Li-ion cell with thermal monitoring for patient-safety compliance.

Use Value: 0.8V reference tolerance (±2%) and <0.25% load regulation ensure ADC reference stability; thermal shutdown at 160°C meets IEC 60601 creepage/derating requirements.

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, 2.5V–6V adjustable output; uses different current-mode architecture with higher quiescent current (17 µA)	Better suited for wide-input industrial rails; not optimized for sub-3V battery start-up	Select when input exceeds 5.5V or >1A output is required; verify loop compensation due to different error amp structure
RT8059GJ6	2.5–5.5V input, 1A output, 0.6–5.0V output; includes light-load pulse-skipping mode but lacks 100% duty cycle	Lower IQ in light load, but cannot sustain regulation below ~2.8V input - unsuitable for deep battery discharge	Prefer for always-on IoT nodes where average efficiency matters more than minimum VIN headroom

Compared with TPS62130ARGTR and RT8059GJ6, the MCP1612-ADJI/MF uniquely combines 2.7V start-up, 100% duty cycle, and ultra-low shutdown current - making it optimal for single-cell Li-ion portable designs where input voltage collapse and standby leakage are critical constraints.

Availability

MCP1612-ADJI/MF is available at Aetrix Electronics and suitable for network interface cards, USB-powered peripherals, and DSL modem power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MCP1612-ADJI/MF 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, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with vertically integrated silicon and development tools.

The MCP1612 belongs to Microchip's high-efficiency DC-DC converter product line, designed specifically for space-constrained, battery-sensitive applications requiring fast transient response, low quiescent current, and robust thermal protection in compact DFN packages.

FAQ

What is the maximum continuous output current of the MCP1612-ADJI/MF?

The MCP1612-ADJI/MF delivers 1A continuous output current under specified thermal conditions. This rating assumes use of the 3×3 mm DFN package with proper PCB copper area and thermal vias to achieve θ_JA = 41°C/W. At ambient temperatures above 60°C or with reduced copper, derating is required per the thermal curves in DS21921C-page 5. The device also features cycle-by-cycle overcurrent protection at +2.3A peak to safeguard against short-circuit faults.

Does the MCP1612-ADJI/MF support 100% duty cycle operation, and what is its practical benefit?

Yes, the MCP1612-ADJI/MF supports true 100% duty cycle operation, allowing VOUT to track VIN minus resistive drops (I_OUT × [R_DS(on,P) + R_INDUCTOR]). This is critical in battery-powered systems where input voltage may drop to 2.7V while maintaining 1.2V or 1.8V output - eliminating the need for a second LDO stage or larger battery cells. It enables reliable operation down to the end-of-discharge voltage of a single Li-ion cell.

How does the dual-ground architecture (AGND and PGND) improve performance in the MCP1612-ADJI/MF?

The MCP1612-ADJI/MF separates analog ground (AGND) and power ground (PGND) to isolate sensitive feedback circuitry from high-di/dt switching currents. AGND serves the FB comparator, error amplifier, and reference - minimizing noise-induced regulation error. PGND handles LX, VIN, and inductor return - reducing ground bounce and EMI. They must connect at a single point near the input capacitor to avoid ground loops, ensuring <0.25% load regulation and stable 1.4 MHz operation.

What external components are mandatory for basic operation of the MCP1612-ADJI/MF?

Four external components are mandatory: (1) 10 µF ceramic input capacitor between VIN and PGND; (2) 3.3 µH shielded buck inductor from LX to VOUT; (3) resistor divider (e.g., 100 kΩ/200 kΩ) from VOUT to FB to set output voltage; and (4) 10 µF ceramic output capacitor from VOUT to PGND. Optional but recommended: 0.1 µF VCC bypass, 25 kΩ + 1000 pF COMP compensation network, and thermal vias under the DFN's exposed pad.

What protection features are integrated into the MCP1612-ADJI/MF, and how do they activate?

The MCP1612-ADJI/MF integrates undervoltage lockout (UVLO, trips at 2.55V falling VIN), overtemperature shutdown (160°C junction, auto-restarts at ~151°C), cycle-by-cycle overcurrent (2.3A peak), and soft-start (controls output ramp rate). UVLO holds the device off until VIN exceeds threshold + hysteresis; thermal shutdown disables switching and resets soft-start; overcurrent terminates each PWM cycle immediately; soft-start limits error amplifier slew rate to prevent overshoot and inrush.

MCP1612-ADJI/MF Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 8-VDFN Exposed Pad

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-DFN (3x3)

MCP1612-ADJI/MF FAQ

1.How can I place an order for MCP1612-ADJI/MF through Aetrix?

Please submit a Request for Quotation (RFQ) for MCP1612-ADJI/MF 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/MF reliable?

The price and inventory of MCP1612-ADJI/MF 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/MF is usually 5 days.

3.What payment methods are accepted for MCP1612-ADJI/MF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1612-ADJI/MF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MCP1612-ADJI/MF?

MCP1612-ADJI/MF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MCP1612-ADJI/MF 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/MF?

For technical support, including MCP1612-ADJI/MF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1612-ADJI/MF requirements.

6.How does Aetrix verify that MCP1612-ADJI/MF is sourced from the original manufacturer or authorized distributors?

All MCP1612-ADJI/MF 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/MF meets industry standards.

7.What is the process for return or replacement of MCP1612-ADJI/MF?

All MCP1612-ADJI/MF units undergo pre-shipment inspection (PSI). If there is an issue with MCP1612-ADJI/MF, 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/MF part is unused and in its original packaging.

Return procedure for MCP1612-ADJI/MF:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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