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Microchip Technology MCP1612T-ADJI/MF
- Part No.:
- MCP1612T-ADJI/MF
- Manufacturer:
- Microchip Technology
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
MCP1612T-ADJI/MF.pdf
- Description:
- IC REG BUCK ADJ 1A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,665
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Product details
Overview
MCP1612T-ADJI/MF from Microchip Technology is a 1A, 1.4 MHz synchronous buck regulator with integrated P- and N-channel MOSFETs, adjustable output (0.8V–5.0V), 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 MCP1612T-ADJI/MF datasheet, MCP1612T-ADJI/MF pinout, MCP1612T-ADJI/MF application, or MCP1612T-ADJI/MF equivalent, key selection criteria include its fixed-frequency current-mode control, thermal shutdown at 160°C, UVLO with 200 mV hysteresis, soft-start implementation, and compatibility with ceramic output capacitors as low as 4.7 µF.
Technical Context
The MCP1612T-ADJI/MF employs peak current mode control with a 1.4 MHz internal oscillator to deliver fast transient response to line and load steps. Its dual-MOSFET architecture integrates a 300 mΩ P-channel and 300 mΩ N-channel switch, enabling continuous 1A output while supporting 100% duty cycle operation below VIN ≈ VOUT + IOUT × RDSon.
Internal analog functions-including 0.8V feedback reference, transconductance error amplifier (gm = 62 µA/V typ.), and dedicated AGND/PGND separation-are optimized for stable regulation under dynamic loads. Protection features include cycle-by-cycle overcurrent limiting (2.3A peak), undervoltage lockout (2.55V typ.), and thermal shutdown with 9°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.4 MHz fixed-enables compact external inductor (e.g., 3.3 µH) and ceramic output capacitor (≥4.7 µF). |
| Input Voltage Range | 2.7V to 5.5V-supports single-cell Li-ion, 2–3 cell NiMH/alkaline, and USB 5V bus inputs. |
| Output Current | 1A continuous-delivers full rated load without derating at +85°C ambient in DFN package (θJA = 41°C/W). |
| Feedback Reference | 0.8V ±20 mV-sets output via resistor divider; enables precise 1.2V, 1.8V, 2.5V, 3.3V, or 5.0V regulation. |
| Shutdown Current | <0.01 µA typ.-minimizes battery drain in standby; SHDN logic-low <15% of VIN disables both switches. |
| Thermal Shutdown | 160°C junction threshold-auto-restarts at ~151°C; prevents permanent damage during sustained overload. |
| UVLO Threshold | 2.55V typ. with 200 mV hysteresis-prevents erratic startup during brown-out; ensures clean enable above minimum operating voltage. |
Pinout & Package
Package: 8-pin DFN (3 mm × 3 mm × 0.9 mm), exposed thermal pad, RoHS-compliant, JEDEC M0-229 equivalent.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input voltage supply | Accepts 2.7V–5.5V; requires 10 µF ceramic bypass to PGND to suppress high-frequency switching noise. |
| VCC | Analog bias supply | Internally filtered from VIN; decoupled via 10 Ω resistor + 0.1 µF ceramic to AGND for noise isolation. |
| SHDN | Logic-controlled enable | Active-high input; >45% VIN enables regulation; <15% VIN forces full shutdown with zero quiescent draw. |
| COMP | Error amplifier output | Connects external RC network (e.g., 25 kΩ + 1000 pF) to stabilize control loop for selected L/COUT. |
| FB | Feedback sensing node | Compares divided output against 0.8V internal reference; high-impedance (1 nA bias) for minimal divider loading. |
| AGND | Analog ground reference | Return for FB, COMP, and internal reference; must be isolated from noisy power paths and tied to PGND only at input cap. |
| PGND | Power ground return | High-current return for VIN, LX, and inductor; short, low-inductance trace required to minimize EMI and voltage spikes. |
| LX | Switch node | Drives buck inductor; carries high di/dt current-requires direct, low-inductance connection to minimize ringing. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual-MOSFET power stage | P- and N-channel switches (300 mΩ each) eliminate external FETs and gate drivers-reducing BOM count and layout complexity. |
| 100% duty cycle operation | Enables dropout-free regulation when VIN approaches VOUT-critical for Li-ion battery discharge down to 2.7V while maintaining 1.8V or 2.5V rail. |
| Fast dynamic load response | Minimizes output capacitance requirement-4.7 µF ceramic suffices for ≤10 mV ripple under 100 mA–1A step loads. |
| Dual ground architecture (AGND/PGND) | Separates sensitive analog returns from high-current switching paths-improves stability and reduces noise coupling into FB/COMP. |
| Comprehensive protection suite | Includes UVLO, thermal shutdown, cycle-by-cycle overcurrent limit, and soft-start-eliminates need for external supervision circuitry. |
Applications
| Portable Computing Power Rail | USB-Powered Peripheral |
|---|---|
Use Scenario: Regulating 3.3V USB input to 1.2V core voltage for an embedded microcontroller in a handheld diagnostic tool. IC Role / Device Role / Timing Role: Primary DC-DC buck converter providing stable, low-noise 1.2V at up to 1A with fast load-step recovery. Use Value: Enables full-speed MCU operation across full USB voltage tolerance (4.75V–5.25V) while maintaining <10 mV output deviation during 100 mA → 1A transients. | Use Scenario: Powering a USB-to-Ethernet adapter IC requiring tightly regulated 2.5V from 5V bus, with ultra-low shutdown current to meet USB suspend requirements. IC Role / Device Role / Timing Role: Efficient step-down regulator with sub-0.01 µA shutdown IQ and 1.4 MHz switching to minimize EMI near high-speed data lines. Use Value: Meets USB 2.0 suspend current budget (<500 µA system-wide) while delivering 2.5V ±1% accuracy and 100% duty cycle support during low-VIN conditions. |
| DSL Router Core Supply | Medical Instrument Low-Noise Rail |
Use Scenario: Generating 1.8V for a DSL PHY ASIC from a 3.3V intermediate rail in space-constrained residential gateway hardware. IC Role / Device Role / Timing Role: High-frequency synchronous buck converter minimizing inductor size and enabling dense PCB layout. Use Value: Achieves >90% efficiency at 500 mA load with 3.3 µH inductor and 10 µF ceramic output cap-reducing thermal footprint and eliminating audible coil whine. | Use Scenario: Providing clean 3.3V analog supply for precision ADC front-end in a portable ECG monitor powered by two alkaline cells (2.4V–3.2V). IC Role / Device Role / Timing Role: Low-dropout buck regulator maintaining regulation down to 2.7V input with minimal output ripple. Use Value: Delivers 3.3V ±10 mV under 200 mA load with <20 µV RMS ripple-meeting medical-grade analog supply noise requirements without additional LDO post-regulation. |
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 | 3.0V–17V input, 3A output, 2.5 MHz switching; no 100% duty cycle; higher IQ (15 µA) | Better suited for wide-input industrial rails; not optimal for sub-3V battery start-up | Select when input exceeds 5.5V or >1A output is required; avoid for Li-ion single-cell systems. |
| RT8059GJ6 | 2.5V–5.5V input, 1A output, 1.5 MHz; integrated compensation; no PGND/AGND separation | Simpler layout but lower noise immunity in mixed-signal designs | Prefer for cost-sensitive consumer applications where analog ground separation is non-critical. |
Compared with TPS62130ARGTR and RT8059GJ6, the MCP1612T-ADJI/MF uniquely supports true 100% duty cycle and dual-ground architecture-making it the only choice among the three for reliable low-VIN battery operation and precision analog supply generation.
Availability
MCP1612T-ADJI/MF is available at Aetrix Electronics and suitable for portable computing, USB-powered peripherals, and DSL router power management requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MCP1612T-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 components, and power management ICs, serving automotive, industrial, and consumer markets with high-reliability silicon and development tools.
The MCP1612T-ADJI/MF belongs to Microchip's synchronous buck regulator product line, designed specifically for compact, high-efficiency DC-DC conversion in battery-powered and space-constrained embedded systems.
FAQ
What is the maximum output current capability of the MCP1612T-ADJI/MF under continuous operation?
The MCP1612T-ADJI/MF delivers 1A continuous output current across the full operating temperature range of –40°C to +85°C when used with the 8-pin DFN package on a standard 4-layer PCB. Its thermal resistance (θJA = 41°C/W) allows this rating without forced airflow or heatsinking, provided layout follows Microchip's recommended copper pour and thermal pad guidelines.
Does the MCP1612T-ADJI/MF support 100% duty cycle operation, and under what conditions?
Yes, the MCP1612T-ADJI/MF supports 100% duty cycle operation to maintain regulation when input voltage drops close to the output voltage-critical for single-cell Li-ion batteries discharging to 2.7V. This mode activates automatically when the control loop demands maximum on-time; output voltage then equals VOUT = VIN – IOUT × (RDSon_P + RINDUCTOR).
How is output voltage set on the MCP1612T-ADJI/MF, and what is the reference voltage accuracy?
Output voltage is set using an external resistor divider connected to the FB pin, referenced to an internal 0.8V bandgap (±20 mV over –40°C to +85°C). For example, a 100 kΩ top resistor and 200 kΩ bottom resistor yields 1.2V output. The FB pin draws only 1 nA bias current, minimizing divider error and enabling high-impedance networks.
What protection features are integrated into the MCP1612T-ADJI/MF?
The MCP1612T-ADJI/MF integrates undervoltage lockout (UVLO, 2.55V typ. with 200 mV hysteresis), cycle-by-cycle overcurrent limiting (2.3A peak), thermal shutdown (160°C junction, 9°C hysteresis), soft-start, and integrated shutdown control. These eliminate the need for external supervisors or current-sense resistors in most applications.
Can the MCP1612T-ADJI/MF operate with ceramic output capacitors, and what is the minimum recommended value?
Yes, the MCP1612T-ADJI/MF is fully compatible with ceramic output capacitors. A minimum of 4.7 µF is recommended for stable operation with low output ripple (<10 mV) under 100 mA–1A load steps. Larger values (e.g., 10–47 µF) further improve load transient response without compromising stability when paired with appropriate COMP network values.
MCP1612T-ADJI/MF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-VDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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)
MCP1612T-ADJI/MF FAQ
1.How can I place an order for MCP1612T-ADJI/MF through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1612T-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 MCP1612T-ADJI/MF reliable?
The price and inventory of MCP1612T-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 MCP1612T-ADJI/MF is usually 5 days.
3.What payment methods are accepted for MCP1612T-ADJI/MF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1612T-ADJI/MF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1612T-ADJI/MF?
MCP1612T-ADJI/MF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1612T-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 MCP1612T-ADJI/MF?
For technical support, including MCP1612T-ADJI/MF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1612T-ADJI/MF requirements.
6.How does Aetrix verify that MCP1612T-ADJI/MF is sourced from the original manufacturer or authorized distributors?
All MCP1612T-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 MCP1612T-ADJI/MF meets industry standards.
7.What is the process for return or replacement of MCP1612T-ADJI/MF?
All MCP1612T-ADJI/MF units undergo pre-shipment inspection (PSI). If there is an issue with MCP1612T-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 MCP1612T-ADJI/MF part is unused and in its original packaging.
Return procedure for MCP1612T-ADJI/MF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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