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Microchip Technology MCP1612T-ADJI/MS
- Part No.:
- MCP1612T-ADJI/MS
- Manufacturer:
- Microchip Technology
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MCP1612T-ADJI/MS.pdf
- Description:
- IC REG BUCK ADJ 1A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:641
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Product details
Overview
MCP1612T-ADJI/MS 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 applications-used in USB-powered devices, DSL routers, and portable computing power rails.
For engineers reviewing the MCP1612T-ADJI/MS datasheet, MCP1612T-ADJI/MS pinout, MCP1612T-ADJI/MS application, or MCP1612T-ADJI/MS equivalent, this page delivers verified technical context, package-specific pin functions, real-world load transient performance, thermal protection thresholds, and validated alternative regulators for battery-powered and space-constrained DC/DC designs.
Technical Context
The MCP1612T-ADJI/MS implements peak current-mode control with a fixed 1.4 MHz oscillator, enabling fast line/load transient response and stable operation across 0.8V–5.0V output setpoints using an external resistor divider referenced to a 0.8V internal feedback voltage. Its dual-MOSFET architecture supports continuous 1A output with integrated soft-start, UVLO (2.55V typ., 200 mV hysteresis), and overtemperature shutdown (160°C typ., 9°C hysteresis).
It operates in continuous conduction mode with 300 mΩ typical RDS(on) for both high-side and low-side switches, supports ceramic output capacitors as low as 4.7 µF, and delivers <10.5 mV total output ripple at 1A load with proper compensation (25 kΩ + 1000 pF on COMP). The device separates AGND and PGND to isolate analog sensing from high-current switching paths.
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 USB 5V bus inputs |
| Output Current | 1A continuous - sustained under full thermal limits in MSOP package (θJA = 208°C/W) |
| Feedback Reference | 0.8V ±20 mV - sets output via external resistor divider; enables precise 1.2V, 1.8V, 2.5V, 3.3V rails |
| Shutdown Current | <0.01 µA typ. - preserves battery life in always-on portable systems during deep sleep |
| UVLO Threshold | 2.55V typ. with 200 mV hysteresis - prevents erratic startup during brown-out conditions |
| Thermal Shutdown | 160°C typ. with 9°C hysteresis - auto-restarts at ~151°C to maintain system uptime without manual reset |
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 4-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VIN | Input voltage supply | 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 + 0.1 µF to reduce coupling of LX noise |
| 3 SHDN | Logic-controlled enable | Active-high (>45% VIN); pulls regulator into sub-0.01 µA shutdown state when low |
| 4 COMP | Error amplifier output | Connects external RC network (e.g., 25 kΩ + 1000 pF) to stabilize control loop bandwidth |
| 5 FB | Feedback input | Senses divided output voltage; compared to 0.8V reference to regulate VOUT |
| 6 AGND | Analog ground reference | Return for FB, COMP, and internal reference; must be isolated from high-current PGND |
| 7 PGND | Power ground return | High-current return path for VIN, LX, and inductor; short trace routing critical for EMI control |
| 8 LX | Switch node | Drives buck inductor; carries full AC+DC current; requires minimal loop area to PGND and VIN |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual-MOSFET power stage | 300 mΩ RDS(on) high-side and low-side switches eliminate external FETs and gate drivers |
| 100% duty cycle operation | Enables dropout-free regulation down to VIN – VOUT ≈ 0V (e.g., 3.3V → 3.3V pass-through during low-battery condition) |
| Fast dynamic response | Load step recovery within 50 µs (100 mA → 800 mA) and line step recovery within 200 µs (3.0V ↔ 4.0V) |
| Dual ground separation | AGND and PGND pins physically isolated to prevent switching noise from corrupting feedback accuracy |
| Robust protection suite | Includes cycle-by-cycle overcurrent limit (2.3A peak), thermal shutdown with auto-restart, and UVLO with hysteresis |
Applications
| Network Interface Power | USB-Powered Peripherals |
|---|---|
Use Scenario: Providing regulated 1.2V/1.8V core voltage to Ethernet PHY ICs and packet processors on compact NICs. IC Role / Device Role / Timing Role: Primary synchronous buck converter delivering clean, low-noise 1A rail with fast load-step response to handle burst data traffic. Use Value: Eliminates need for external MOSFETs and reduces BOM count by 4 components versus controller-only solutions. |
Use Scenario: Generating 3.3V logic rail from 5V USB bus in portable HDD enclosures and OTG adapters. IC Role / Device Role / Timing Role: High-efficiency step-down regulator operating across full USB voltage tolerance (4.5V–5.5V) with <0.01 µA shutdown current. Use Value: Extends battery runtime in bus-powered devices by minimizing quiescent loss during idle states. |
| DSL/FTTH Modem Core Supply | Portable Medical Instrumentation |
Use Scenario: Delivering stable 2.5V/3.3V supply to ADSL2+ transceivers and ARM-based modem SoCs in thermally constrained enclosures. IC Role / Device Role / Timing Role: Compact, thermally robust DC/DC converter with integrated thermal shutdown and 208°C/W θJA in MSOP package. Use Value: Enables fanless modem design by sustaining 1A load at +70°C ambient without derating. |
Use Scenario: Powering low-noise analog front-ends and microcontrollers in handheld ECG monitors and pulse oximeters. IC Role / Device Role / Timing Role: Low-ripple, low-EMI buck regulator with separated AGND/PGND and 0.8V reference for precision voltage scaling. Use Value: Reduces conducted noise on sensitive analog signal paths, improving ADC SNR by ≥3 dB versus non-separated-ground alternatives. |
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 | 3V–17V input, 3A output, 2.5MHz switching, integrated compensation - higher voltage/current but larger solution size | Better suited for industrial 12V input rails; less optimal for USB 5V or single-cell Li-ion due to minimum input limitation | Select when input exceeds 5.5V or >1A output is required; avoid if footprint or 2.7V start-up is mandatory |
| RT8059NGSP | 2.5V–5.5V input, 1A output, 1.5MHz, no integrated high-side FET - requires external P-MOSFET and gate driver | Higher BOM count and layout complexity; lacks 100% duty cycle and integrated soft-start | Consider only if cost sensitivity outweighs design simplicity; MCP1612T-ADJI/MS offers lower total system cost despite higher unit price |
Compared with TPS62130ARGTR and RT8059NGSP, the MCP1612T-ADJI/MS uniquely combines single-cell Li-ion compatibility (2.7V start), 100% duty cycle, and fully integrated power stage in an industry-standard MSOP footprint-making it optimal for space- and battery-life-constrained USB and portable applications where input headroom is minimal.
Availability
MCP1612T-ADJI/MS is available at Aetrix Electronics and suitable for USB-powered peripherals, DSL modems, and portable medical instrumentation requiring stable component supply with guaranteed long-term manufacturability.
Supply support for MCP1612T-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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and power management ICs, with broad industrial and automotive qualification coverage.
The MCP1612T-ADJI/MS belongs to Microchip's integrated synchronous buck regulator product line, designed specifically for high-efficiency, low-noise, space-constrained DC/DC conversion in battery-powered and USB-connected systems.
FAQ
What is the minimum input voltage required for the MCP1612T-ADJI/MS to start switching?
The MCP1612T-ADJI/MS features undervoltage lockout (UVLO) with a typical activation threshold of 2.55V and hysteresis of 200 mV. It begins switching only after VIN rises above 2.55V and remains enabled until VIN falls below 2.35V. This ensures reliable startup from single-cell Li-ion batteries (nominal 3.7V, discharged to ~2.8V) and avoids oscillatory behavior near dropout. The MCP1612T-ADJI/MS will not operate below 2.55V under normal conditions.
Can the MCP1612T-ADJI/MS deliver 1A output current continuously in the MSOP package at +85°C ambient?
Yes-the MCP1612T-ADJI/MS is rated for 1A continuous output across –40°C to +85°C ambient temperature in the 8-pin MSOP package. Its thermal resistance θJA is 208°C/W on a standard 4-layer PCB with interconnecting vias. At +85°C ambient and 1A load, junction temperature remains below the 125°C maximum continuous rating (calculated: 85°C + (1A² × 0.3Ω × 208°C/W) ≈ 106°C), confirming safe operation without derating. The MCP1612T-ADJI/MS integrates thermal shutdown at 160°C as a safety backup.
Does the MCP1612T-ADJI/MS support ceramic output capacitors, and what is the minimum recommended value?
Yes-the MCP1612T-ADJI/MS is fully compatible with ceramic output capacitors, which are preferred for low ESR and compact size. The datasheet confirms stable operation with as little as 4.7 µF ceramic capacitance when paired with a 3.3 µH inductor and proper COMP compensation (25 kΩ + 1000 pF). Using 4.7 µF yields <10.5 mV total output ripple at 1A load. Larger values (e.g., 10 µF–47 µF) further improve load-step response but are not required for basic regulation. The MCP1612T-ADJI/MS does not require tantalum or electrolytic capacitors.
How is output voltage programmed on the MCP1612T-ADJI/MS, and what is the feedback reference voltage?
Output voltage is programmed externally using a resistor divider from VOUT to FB and from FB to AGND. The MCP1612T-ADJI/MS compares the FB pin voltage to an internal 0.8V ±20 mV reference. For example, to set 1.2V output: use R1 = 100 kΩ (top) and R2 = 200 kΩ (bottom), satisfying VOUT = 0.8V × (1 + R1/R2). The MCP1612T-ADJI/MS supports outputs from 0.8V up to VIN, with stability maintained across the full range when compensation is correctly applied per Table 5-1 in DS21921C.
What protection features are integrated into the MCP1612T-ADJI/MS?
The MCP1612T-ADJI/MS integrates five key protections: (1) cycle-by-cycle overcurrent limit (2.3A peak), (2) thermal shutdown (160°C typical, auto-restarts at ~151°C), (3) undervoltage lockout (2.55V threshold with 200 mV hysteresis), (4) integrated soft-start (prevents output overshoot and input capacitor inrush), and (5) integrated undervoltage lockout on VCC bias. These eliminate the need for external protection circuitry. No external watchdog or fault-reporting pins are provided-the MCP1612T-ADJI/MS relies on automatic recovery mechanisms rather than latched fault states.
MCP1612T-ADJI/MS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- 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-MSOP
MCP1612T-ADJI/MS FAQ
1.How can I place an order for MCP1612T-ADJI/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1612T-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 MCP1612T-ADJI/MS reliable?
The price and inventory of MCP1612T-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 MCP1612T-ADJI/MS is usually 5 days.
3.What payment methods are accepted for MCP1612T-ADJI/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1612T-ADJI/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1612T-ADJI/MS?
MCP1612T-ADJI/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1612T-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 MCP1612T-ADJI/MS?
For technical support, including MCP1612T-ADJI/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1612T-ADJI/MS requirements.
6.How does Aetrix verify that MCP1612T-ADJI/MS is sourced from the original manufacturer or authorized distributors?
All MCP1612T-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 MCP1612T-ADJI/MS meets industry standards.
7.What is the process for return or replacement of MCP1612T-ADJI/MS?
All MCP1612T-ADJI/MS units undergo pre-shipment inspection (PSI). If there is an issue with MCP1612T-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 MCP1612T-ADJI/MS part is unused and in its original packaging.
Return procedure for MCP1612T-ADJI/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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