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Microchip Technology MCP1601-I/MS
- Part No.:
- MCP1601-I/MS
- Manufacturer:
- Microchip Technology
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MCP1601-I/MS.pdf
- Description:
- IC REG BUCK ADJ 500MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,717
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Product details
Overview
MCP1601-I/MS from Microchip Technology is a fully integrated synchronous buck DC/DC converter optimized for single-cell Li-ion and multi-cell alkaline/NiMH battery-powered systems. It delivers up to 500 mA continuous output current, supports input range 2.7V–5.5V, operates at fixed 750 kHz PWM or auto-switching PFM mode, and regulates output down to 0.9V-enabling efficient power conversion in handheld CPUs, USB devices, and digital cameras.
For engineers reviewing the MCP1601-I/MS datasheet, MCP1601-I/MS pinout, MCP1601-I/MS application, or MCP1601-I/MS equivalent, this page provides verified technical context, validated pin functions, confirmed operating modes (PWM/PFM/LDO), real-world efficiency data (>92% typical), and precise alternative part comparisons for low-power portable power design.
Technical Context
The MCP1601-I/MS implements feedforward voltage-mode PWM control with internal 750 kHz oscillator and external synchronization capability (850 kHz–1 MHz). Its three-mode operation-forced PWM, auto PWM/PFM, and 100% duty-cycle LDO-enables dynamic adaptation across load and input voltage conditions while maintaining stable regulation from 0.9V to VIN.
It integrates complementary P-channel high-side and N-channel low-side synchronous switches (RDS(on) ≈ 500 mΩ each), soft-start circuitry (0.5 ms typical), and protection features including UVLO (2.4–2.7 V threshold), over-temperature shutdown (160°C), and cycle-by-cycle peak current limiting (1.0 A typical in PWM mode).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports single Li-ion (2.7–4.2 V) or 2–3 cell alkaline/NiMH sources without external regulators. |
| Output Current | 500 mA continuous - sufficient for low-power DSPs, microcontrollers, and camera sensors in portable designs. |
| Switching Frequency | 750 kHz fixed (PWM), auto-synchronized to external 850 kHz–1 MHz clock - enables compact 10 µH inductors and ceramic capacitors. |
| Feedback Reference | 0.8 V ±20 mV - sets output via resistor divider; supports adjustable VOUT from 0.9 V to VIN with <1.5% load regulation. |
| Operating Modes | PWM, PFM, and LDO - automatically transitions between modes to maximize efficiency across 0–500 mA load range and VIN near VOUT. |
| Thermal Protection | 160°C shutdown with 10°C hysteresis - prevents thermal runaway during sustained overload or poor PCB heatsinking. |
| Quiescent Current | 119–180 µA in PFM mode (ILOAD = 0 mA) - extends battery life in standby or intermittent-use applications. |
Pinout & Package
Package: 8-pin MSOP (3.0 mm × 3.0 mm, 0.65 mm pitch), rated for -40°C to +85°C ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Unregulated input supply connection | Accepts 2.7–5.5 V; requires local 10 µF ceramic decoupling for pulse-current filtering. |
| SHDN (Pin 2) | Active-low enable/shutdown control | Pulls device into <1 µA shutdown state; logic low ≤15% of VIN disables all switching and bias circuits. |
| FB (Pin 3) | Feedback voltage sensing node | Compares divided output against 0.8 V reference; sets VOUT via R1/R2 divider (e.g., 250 kΩ/200 kΩ for 1.8 V). |
| AGND (Pin 4) | Analog ground reference | Return path for FB, SYNC/PWM, and internal bandgap; must be isolated from PGND to minimize noise coupling. |
| SYNC/PWM (Pin 5) | Mode selection & external sync input | Logic high = forced PWM; logic low = auto PWM/PFM; external 850 kHz–1 MHz clock forces PWM-only operation. |
| VOUT (Pin 6) | Output voltage sense input | Direct connection to regulated output; used for accurate sensing and loop compensation in high-precision applications. |
| PGND (Pin 7) | Power ground return | High-current return for LX switch node and output capacitor; must be low-impedance copper pour tied to AGND at single point. |
| LX (Pin 8) | Synchronous buck switch node | Connects to inductor; carries high di/dt current; requires short, wide trace to minimize EMI and conduction loss. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous switches | P-channel high-side and N-channel low-side MOSFETs (RDS(on) ≈ 500 mΩ each) eliminate external FETs and reduce BOM count. |
| Three adaptive operating modes | Auto-switching between PWM (fixed 750 kHz), PFM (ultra-low IQ at light load), and LDO (100% duty cycle for VIN ≈ VOUT) maximizes efficiency across full load range. |
| Internal soft-start | 0.5 ms typical startup time prevents inrush current; resets automatically after overcurrent or thermal fault recovery. |
| Full protection suite | Integrated UVLO (2.4–2.7 V), over-temperature shutdown (160°C), and cycle-by-cycle current limiting ensure robust operation without external components. |
| Ceramic-capacitor optimized design | Stable with 10–47 µF X5R/X7R ceramics; supports low-profile 10 µH inductors and achieves <10 mV ripple in PWM mode. |
Applications
| Mobile Handheld Processors | USB-Powered Peripherals |
|---|---|
Use Scenario: Powering ARM Cortex-M microcontrollers or low-power DSPs in battery-operated PDAs and organizers with variable load profiles. IC Role / Device Role / Timing Role: Primary step-down regulator delivering stable 1.2–3.3 V core voltage with automatic mode switching to maintain >90% efficiency from 1 mA to 400 mA. Use Value: Eliminates need for discrete buck controller + FETs; reduces board area by >40% versus legacy solutions while extending runtime via PFM mode. | Use Scenario: Regulating 5 V USB input to 3.3 V or 1.8 V for Bluetooth modules, HID devices, or portable audio DACs. IC Role / Device Role / Timing Role: Input-voltage-robust buck converter supporting 4.5–5.5 V USB input range and delivering up to 500 mA with <1.5% load regulation. Use Value: Maintains regulation during USB port voltage sag; enables direct USB bus powering without intermediate LDO stages. |
| Digital Imaging Sensors | Low-Power Communication ICs |
Use Scenario: Supplying clean, low-noise 2.8 V or 3.3 V to CMOS image sensors in compact digital cameras and action cams. IC Role / Device Role / Timing Role: High-efficiency synchronous buck with <10 mV PWM ripple and fast transient response (<10 µs) to sensor burst-mode current demands. Use Value: Reduces thermal dissipation vs. linear regulators; avoids image noise from switching artifacts via optimized layout guidance in datasheet. | Use Scenario: Powering sub-GHz RF transceivers (e.g., Si4463) or BLE SoCs requiring stable 1.8 V or 2.5 V under pulsed transmit loads. IC Role / Device Role / Timing Role: Adaptive-mode regulator that shifts to PWM during TX bursts (400 mA peaks) and reverts to PFM during RX/idle (µA quiescent). Use Value: Extends coin-cell or small Li-ion battery life by >3× versus fixed-frequency converters in intermittent wireless applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Texas Instruments TPS62231DRVR | Fixed 3.3 V output (non-adjustable); 2.05–6.5 V input; 300 mA max; 3.8 MHz switching frequency. | Targeted for space-constrained fixed-VOUT applications; lacks PFM/LDO modes and external sync capability. | Select when board area is critical and output voltage is fixed; avoid if adjustable VOUT or ultra-low IQ at light load is required. |
| Analog Devices ADP2301ARZ-R7 | 3.0–20 V input; 600 mA output; 700 kHz fixed frequency; no PFM mode; requires external compensation. | Better suited for higher-input industrial rails; lacks auto-mode switching and integrated soft-start. | Prefer for 5–12 V input systems where cost-per-watt matters more than battery optimization; verify loop stability with external components. |
Compared with TPS62231DRVR and ADP2301ARZ-R7, the MCP1601-I/MS uniquely combines adjustable output (0.9–VIN), true auto PWM/PFM/LDO mode transition, and full protection integration in an 8-pin MSOP-making it optimal for battery-powered portable designs demanding both efficiency and flexibility.
Availability
MCP1601-I/MS is available at Aetrix Electronics and suitable for low-power handheld processors, USB-powered peripherals, digital imaging sensors, and low-power communication ICs requiring stable component supply across extended production lifecycles.
Supply support for MCP1601-I/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, interface, and power management ICs for embedded control applications.
The MCP1601 product line was designed specifically for highly integrated, low-quiescent-current DC/DC conversion in space- and battery-constrained portable electronics-emphasizing efficiency across wide load ranges and seamless mode transitions.
FAQ
What is the maximum continuous output current capability of the MCP1601-I/MS?
The MCP1601-I/MS delivers up to 500 mA continuous output current under typical conditions (TA = +25°C, VIN = 4.2 V, VOUT = 1.8 V). This rating assumes proper thermal management using the 8-pin MSOP package on a standard single-layer PCB with natural convection (θJA = 208°C/W). At elevated ambient temperatures or with reduced airflow, derating may be required to maintain safe junction temperature.
Does the MCP1601-I/MS support external clock synchronization, and what are the requirements?
Yes, the MCP1601-I/MS supports external synchronization via the SYNC/PWM pin. The external clock must operate between 850 kHz and 1 MHz, with duty cycle between 10% and 90%, logic-high level above 45% of VIN, logic-low level below 15% of VIN, and rise/fall times faster than 100 ns (10% to 90%). When synchronized, the MCP1601-I/MS operates exclusively in PWM mode.
How does the MCP1601-I/MS handle input voltages close to the output voltage?
When VIN approaches VOUT, the MCP1601-I/MS automatically enters Low Dropout (LDO) mode, enabling up to 100% duty cycle operation. In this mode, the high-side P-channel MOSFET saturates like a linear regulator, maintaining regulation down to VIN – VOUT ≈ 250 mV at 300 mA load. This extends usable battery life in single-cell Li-ion applications where voltage drops below 3.3 V.
What protection features are integrated into the MCP1601-I/MS?
The MCP1601-I/MS integrates under-voltage lockout (UVLO active below 2.4–2.7 V), over-temperature shutdown (160°C trip with 10°C hysteresis), cycle-by-cycle peak current limiting (1.0 A typical), and soft-start circuitry (0.5 ms typical). All protections operate autonomously without external components, ensuring fail-safe behavior during fault conditions.
Can the MCP1601-I/MS operate with ceramic output capacitors, and what is the recommended value range?
Yes, the MCP1601-I/MS is optimized for ceramic output capacitors. The recommended range is 10 µF to 47 µF (±20%), with X5R or X7R dielectrics preferred for stable capacitance over temperature. For PFM mode stability, inductor and capacitor values should match (e.g., 10 µH + 10 µF). Using 10 µF X5R yields typical output ripple <10 mV in PWM mode.
MCP1601-I/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):
- 0.9V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 500mA
- Frequency - Switching:
- 750kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
MCP1601-I/MS FAQ
1.How can I place an order for MCP1601-I/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1601-I/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 MCP1601-I/MS reliable?
The price and inventory of MCP1601-I/MS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1601-I/MS is usually 5 days.
3.What payment methods are accepted for MCP1601-I/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1601-I/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1601-I/MS?
MCP1601-I/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1601-I/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 MCP1601-I/MS?
For technical support, including MCP1601-I/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1601-I/MS requirements.
6.How does Aetrix verify that MCP1601-I/MS is sourced from the original manufacturer or authorized distributors?
All MCP1601-I/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 MCP1601-I/MS meets industry standards.
7.What is the process for return or replacement of MCP1601-I/MS?
All MCP1601-I/MS units undergo pre-shipment inspection (PSI). If there is an issue with MCP1601-I/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 MCP1601-I/MS part is unused and in its original packaging.
Return procedure for MCP1601-I/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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