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Microchip Technology MCP1603T-180I/OS
- Part No.:
- MCP1603T-180I/OS
- Manufacturer:
- Microchip Technology
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MCP1603T-180I/OS.pdf
- Description:
- IC REG BUCK 1.8V 500MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:11,294
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Product details
Overview
MCP1603T-180I/OS from Microchip Technology is a fixed-output 1.8 V, 500 mA synchronous buck regulator optimized for single-cell Li-Ion and multi-cell NiMH/NiCd battery-powered portable electronics. It operates from 2.7 V to 5.5 V input, delivers >90% typical efficiency at full load, features 2.0 MHz PWM switching, automatic PFM/PWM mode transition, and integrated overtemperature and overcurrent protection. It is used in USB-powered devices and digital cameras requiring compact, high-efficiency DC-DC conversion.
For engineers reviewing the MCP1603T-180I/OS datasheet, MCP1603T-180I/OS pinout, MCP1603T-180I/OS application, or MCP1603T-180I/OS equivalent, key selection criteria include fixed 1.8 V output accuracy (±2.5%), 45 µA PFM quiescent current, 0.1 µA shutdown current, thermal shutdown at 150°C, and compatibility with 4.7 µF input/output capacitors and 4.7 µH inductors in space-constrained designs.
Technical Context
The MCP1603T-180I/OS implements a current-mode synchronous buck architecture with integrated P- and N-channel MOSFETs, enabling 100% duty cycle operation and eliminating external diode losses. Its dual-mode control logic automatically transitions between 2.0 MHz fixed-frequency PWM (for low-noise, low-ripple heavy-load operation) and pulse-skipping PFM (for ultra-low 45 µA quiescent current under light loads).
It includes internal compensation, soft-start circuitry limiting VOUT overshoot, undervoltage lockout (UVLO) with 2.28 V threshold and 140 mV hysteresis, cycle-by-cycle peak current limiting at 860 mA, and thermal shutdown with 10°C hysteresis - all operating across –40°C to +85°C ambient temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±2.5% over –40°C to +85°C - ensures stable core voltage for low-power microcontrollers and sensors. |
| Max Output Current | 500 mA continuous - supports moderate-power peripherals like camera modules and USB transceivers. |
| Input Voltage Range | 2.7 V to 5.5 V - compatible with 1-cell Li-Ion (2.7–4.2 V), 2–3-cell NiMH/NiCd (2.4–4.5 V), and USB 5 V rails. |
| Quiescent Current (PFM) | 45 µA typical - extends battery life in standby modes of portable equipment. |
| Shutdown Current | 0.1 µA typical - enables deep-sleep power management in always-on subsystems. |
| Switching Frequency | 2.0 MHz typical (PWM mode) - allows use of small 4.7 µH inductors and 4.7 µF ceramic capacitors. |
| Feedback Reference | 0.8 V internal reference - sets output via internal resistor divider; no external components required for fixed 1.8 V. |
| Thermal Shutdown | 150°C junction temperature with 10°C hysteresis - protects against sustained overload or poor PCB thermal design. |
Pinout & Package
Package: 5-Lead TSOT-23 (thin small-outline transistor), lead-free, RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Power supply input | Accepts 2.7–5.5 V input; requires local 4.7 µF ceramic decoupling to GND for stability and EMI reduction. |
| 2 (GND) | Ground reference | Primary return path for power and control circuits; must be connected to low-impedance PCB ground plane. |
| 3 (SHDN) | Enable/disable control | Logic-high (>45% VIN) enables regulation; logic-low (<15% VIN) disables output and reduces current to 0.1 µA. |
| 4 (VFB/VOUT) | Output voltage sense / feedback | Internally connected to fixed 1.8 V divider; connect directly to output node - no external resistors needed. |
| 5 (LX) | Switch node | Drives external buck inductor; carries high di/dt current - requires shortest possible trace to minimize EMI and voltage spikes. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic PFM/PWM mode transition | Enables >90% efficiency across 0.1–500 mA load range without external control or configuration. |
| Internally compensated control loop | Eliminates need for external compensation network - reduces BOM count and layout complexity. |
| 100% duty cycle capability | Supports regulation down to VIN ≈ VOUT + headroom (e.g., 1.85 V input for 1.8 V output), critical for end-of-battery-life operation. |
| Integrated overcurrent protection | 860 mA cycle-by-cycle current limit prevents damage during short-circuit or startup into heavy capacitive loads. |
| Low-profile TSOT-23 package | 1.3 mm × 2.9 mm footprint with 0.95 mm height - fits tight spaces in handheld and wearable devices. |
| Soft-start circuitry | Controls output ramp rate to limit inrush current and prevent VOUT overshoot during enable or VIN rise. |
Applications
| Portable Digital Cameras | USB-Powered Peripherals |
|---|---|
|
Use Scenario: Powering image sensor, ISP, and memory interface from a single Li-Ion cell or USB 5 V bus. IC Role / Device Role / Timing Role: Primary 1.8 V core supply regulator delivering up to 500 mA with fast transient response. Use Value: Maintains stable 1.8 V rail under dynamic load steps (e.g., sensor readout bursts), minimizing noise-induced image artifacts. |
Use Scenario: Regulating 5 V USB input to clean 1.8 V for MCU, USB PHY, and flash memory in dongles or adapters. IC Role / Device Role / Timing Role: Efficient step-down converter with low quiescent current to meet USB suspend current limits. Use Value: Achieves <0.1 µA shutdown current and 45 µA light-load IQ, enabling compliance with USB 2.0/3.0 low-power states. |
| Handheld Organizers / PDAs | Bluetooth Headsets |
|
Use Scenario: Supplying 1.8 V to application processor, display driver, and touch controller in battery-operated organizers. IC Role / Device Role / Timing Role: Main system regulator supporting variable load profiles from idle to active UI rendering. Use Value: Delivers >90% efficiency at full load and ultra-low 45 µA IQ in PFM mode, extending runtime between charges. |
Use Scenario: Generating 1.8 V for Bluetooth SoC and audio codec from a 3.7 V Li-Poly battery in compact headset form factor. IC Role / Device Role / Timing Role: Compact, thermally efficient DC-DC stage enabling continuous voice call operation. Use Value: TSOT-23 package and integrated MOSFETs reduce solution size vs. discrete buck controllers, while thermal shutdown prevents overheating in sealed enclosures. |
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 TPS62231DRYR | Fixed 1.8 V, 600 mA, 3 MHz switching, 17 µA IQ (typ), 5-pin WSON package. | Higher switching frequency enables smaller passives; lower IQ improves ultra-light-load efficiency. | Preferred when board space is extremely constrained and light-load battery life is critical. |
| Analog Devices ADP2301AUJZ-1.8-R7 | Fixed 1.8 V, 600 mA, 700 kHz switching, 2.2 mA IQ (typ), 6-pin TSOT package. | Lower frequency increases inductor size but reduces EMI; higher IQ limits standby efficiency. | Consider only if lower EMI is prioritized over size and quiescent power in cost-sensitive industrial designs. |
Compared with MCP1603T-180I/OS, the TPS62231DRYR offers superior light-load efficiency and smaller passive requirements due to its 3 MHz operation, while the ADP2301AUJZ-1.8-R7 trades off frequency and IQ for simpler EMI filtering - making the MCP1603T-180I/OS optimal for balanced performance in portable consumer devices.
Availability
MCP1603T-180I/OS is available at Aetrix Electronics and suitable for portable digital cameras, USB-powered peripherals, and Bluetooth headsets requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.
Supply support for MCP1603T-180I/OS 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 Inc. is a leading provider of microcontroller, analog, FPGA, and mixed-signal semiconductor solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The MCP1603/B/L family was designed specifically for high-efficiency, low-quiescent-current DC-DC conversion in space- and battery-limited portable electronics - emphasizing integration, thermal robustness, and seamless PFM/PWM mode handoff.
FAQ
What is the maximum input voltage rating for the MCP1603T-180I/OS?
The MCP1603T-180I/OS has an absolute maximum input voltage rating of +6.0 V on the VIN pin. Operation above 5.5 V is not recommended, as the device is specified for reliable performance only within the 2.7 V to 5.5 V input range. Exceeding 6.0 V risks permanent damage per the Absolute Maximum Ratings table in DS22042B.
Does the MCP1603T-180I/OS require external compensation components?
No, the MCP1603T-180I/OS is internally compensated. Its control loop is factory-tuned for stability with standard 4.7 µF input/output capacitors and a 4.7 µH inductor. No external RC network is needed - a key advantage of the fixed-output variant that simplifies layout and reduces bill-of-materials count.
How does the MCP1603T-180I/OS behave during startup?
The MCP1603T-180I/OS incorporates soft-start circuitry that controls the output voltage ramp rate during enable or VIN rise above UVLO. This prevents VOUT overshoot and limits inrush current, ensuring clean, controlled power-up of downstream 1.8 V logic without requiring external sequencing components.
What is the purpose of the LX pin on the MCP1603T-180I/OS?
The LX (switch node) pin connects directly to the buck inductor and carries high di/dt switching current. It interfaces with the internal synchronous P- and N-channel MOSFETs. Layout best practice requires the shortest possible trace from LX to the inductor to minimize parasitic inductance, EMI, and voltage ringing - critical for stable 2.0 MHz operation.
Is the MCP1603T-180I/OS compatible with ceramic output capacitors?
Yes, the MCP1603T-180I/OS is fully compatible with low-ESR ceramic output capacitors such as X5R or X7R dielectrics. The datasheet specifies 4.7 µF as the minimum recommended value, and up to 22 µF is acceptable - enabling compact, high-performance filtering without electrolytic or tantalum alternatives.
MCP1603T-180I/OS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
MCP1603T-180I/OS FAQ
1.How can I place an order for MCP1603T-180I/OS through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1603T-180I/OS 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 MCP1603T-180I/OS reliable?
The price and inventory of MCP1603T-180I/OS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1603T-180I/OS is usually 5 days.
3.What payment methods are accepted for MCP1603T-180I/OS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1603T-180I/OS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1603T-180I/OS?
MCP1603T-180I/OS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1603T-180I/OS 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 MCP1603T-180I/OS?
For technical support, including MCP1603T-180I/OS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1603T-180I/OS requirements.
6.How does Aetrix verify that MCP1603T-180I/OS is sourced from the original manufacturer or authorized distributors?
All MCP1603T-180I/OS 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 MCP1603T-180I/OS meets industry standards.
7.What is the process for return or replacement of MCP1603T-180I/OS?
All MCP1603T-180I/OS units undergo pre-shipment inspection (PSI). If there is an issue with MCP1603T-180I/OS, 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 MCP1603T-180I/OS part is unused and in its original packaging.
Return procedure for MCP1603T-180I/OS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MCP1603T-180I/OS Tags
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