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Microchip Technology MCP1603-180I/MC
- Part No.:
- MCP1603-180I/MC
- Manufacturer:
- Microchip Technology
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
MCP1603-180I/MC.pdf
- Description:
- IC REG BUCK 1.8V 500MA 8DFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MCP1603-180I/MC 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, and integrates P-channel and N-channel MOSFETs in a 5-lead TSOT package. Used in USB-powered devices and digital cameras for compact, low-noise 1.8 V rail generation.
For engineers reviewing the MCP1603-180I/MC datasheet, MCP1603-180I/MC pinout, MCP1603-180I/MC application, or MCP1603-180I/MC equivalent, key selection criteria include its fixed 1.8 V output, 45 µA PFM quiescent current (MCP1603/L variant), 0.1 µA shutdown current, UVLO threshold of 2.28 V (typ), and thermal shutdown at 150°C - all critical for battery-life-sensitive portable designs.
Technical Context
The MCP1603-180I/MC implements a current-mode synchronous buck architecture with automatic PWM-to-PFM mode transition under light load to minimize quiescent current. Its internal 0.8 V reference feeds a precision feedback loop, enabling ±2.5% output voltage tolerance over –40°C to +85°C ambient.
It integrates undervoltage lockout (2.28 V typ, 140 mV hysteresis), cycle-by-cycle overcurrent protection (860 mA peak limit), and thermal shutdown (150°C typ, 10°C hysteresis). The device uses an internal oscillator with 2.0 MHz nominal frequency (1.5–2.8 MHz range) and supports 100% duty cycle operation for low-dropout regulation.
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/logic rail without external resistor divider. |
| Max Output Current | 500 mA continuous - sufficient for microcontrollers, sensors, and interface ICs in portable systems. |
| 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 sources. |
| Quiescent Current (PFM) | 45 µA typical - extends battery runtime in standby/sleep modes of handheld devices. |
| Shutdown Current | 0.1 µA typical - enables ultra-low-power system-level power gating. |
| Switching Frequency | 2.0 MHz typical (1.5–2.8 MHz) - allows use of small 4.7 µH inductors and 4.7 µF ceramic capacitors. |
| UVLO Threshold | 2.28 V typical with 140 mV hysteresis - prevents erratic startup during battery voltage sag. |
Pinout & Package
Package: 5-Lead TSOT-23 (MCP1603/MCP1603B variant), footprint-optimized for space-constrained portable PCBs. Exposed pad not present - thermal path relies on PCB copper area under leads.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VIN | Input power supply (2.7–5.5 V); requires local 4.7 µF ceramic decoupling to GND. |
| 2 | GND | Power ground reference; shortest possible trace to minimize noise and EMI. |
| 3 | SHDN | Logic-enable input; high (>45% VIN) enables regulation, low (<15% VIN) disables output and reduces IIN to 0.1 µA. |
| 4 | VFB/VOUT | Feedback node tied directly to output for fixed 1.8 V version; no external divider needed. |
| 5 | LX | Switch node connecting to buck inductor; carries high di/dt current - must be routed short and wide. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Synchronous MOSFETs | P-channel and N-channel switches eliminate external diode, improving efficiency and reducing BOM count. |
| Automatic PWM/PFM Transition | Seamlessly shifts between 2.0 MHz PWM (low ripple) and PFM (45 µA IQ) based on load - no control logic required. |
| Internally Compensated Loop | No external compensation components needed - simplifies design and improves stability across operating conditions. |
| Robust Protection Suite | Includes UVLO (2.28 V), overtemperature shutdown (150°C), and cycle-by-cycle current limiting (860 mA). |
Applications
| Cellular Telephones | Digital Cameras |
|---|---|
Use Scenario: Powering baseband processor and RF transceiver core rails from single-cell Li-Ion battery. IC Role / Device Role / Timing Role: Primary 1.8 V synchronous buck regulator delivering up to 500 mA with minimal board area. Use Value: Enables >90% efficiency at 300 mA load and 45 µA quiescent current in PFM mode - directly extending talk time and standby duration. |
Use Scenario: Supplying image sensor and ISP logic voltage in compact camera modules. IC Role / Device Role / Timing Role: Fixed 1.8 V step-down converter with low output ripple (<15 mV) for noise-sensitive analog front-end circuits. Use Value: 2.0 MHz switching frequency allows miniature 4.7 µH inductor and 4.7 µF ceramic capacitor - meeting strict size constraints. |
| USB-Powered Devices | Portable Computers |
Use Scenario: Regulating clean 1.8 V rail from 5 V USB source for embedded controllers and peripherals. IC Role / Device Role / Timing Role: Input-capable buck converter supporting 2.7–5.5 V range with UVLO hysteresis preventing brownout oscillation. Use Value: 0.1 µA shutdown current enables full-system power-off while retaining fast wake-up capability via SHDN pin. |
Use Scenario: Providing auxiliary 1.8 V supply for memory interfaces or touch controller in sub-notebook platforms. IC Role / Device Role / Timing Role: Space-efficient TSOT-23 DC-DC solution with integrated thermal protection for thermally dense layouts. Use Value: Thermal shutdown at 150°C with 10°C hysteresis ensures reliable operation during sustained CPU/GPU activity without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | Fixed 1.8 V, 500 mA, 3.0–5.5 V input, 2.25 MHz switching, 17 µA IQ (PFM) | Higher minimum input voltage excludes single-cell Li-Ion below 3.0 V; lower IQ benefits ultra-low-power sleep states. | Select when input is guaranteed ≥3.0 V and sub-20 µA quiescent current is prioritized over battery-sag tolerance. |
| RT8059GJ6 | Adjustable 0.6–5.0 V, 600 mA, 2.5–5.5 V input, 1.5 MHz, 28 µA IQ (PFM) | Requires external feedback resistors; wider input range but no 2.7 V start-up capability for depleted batteries. | Choose when adjustable output or higher current headroom is needed, accepting added BOM and layout complexity. |
Compared with TPS62231DRYR and RT8059GJ6, the MCP1603-180I/MC uniquely supports 2.7 V start-up and maintains regulation down to that level - making it optimal for Li-Ion applications where battery voltage drops below 3.0 V during discharge, while offering proven robustness in portable consumer designs.
Availability
MCP1603-180I/MC is available at Aetrix Electronics and suitable for cellular telephones, digital cameras, and USB-powered devices requiring stable component supply across long production lifecycles and seasonal demand spikes.
Supply support for MCP1603-180I/MC 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, mixed-signal, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with high-reliability silicon and development tools.
The MCP1603/B/L family was designed specifically for space- and efficiency-critical portable electronics, delivering integrated synchronous buck conversion with minimal external components and industry-leading light-load efficiency.
FAQ
What is the input voltage range supported by the MCP1603-180I/MC?
The MCP1603-180I/MC supports an input voltage range of 2.7 V to 5.5 V. This range enables direct operation from single-cell Li-Ion batteries (2.7–4.2 V), two- or three-cell NiMH/NiCd packs (2.4–4.5 V), and standard 5 V USB sources. Its 2.28 V UVLO threshold with 140 mV hysteresis ensures reliable startup and dropout behavior across this full span. The MCP1603-180I/MC maintains regulation even as input voltage declines near the lower limit.
Does the MCP1603-180I/MC require external compensation components?
No, the MCP1603-180I/MC is internally compensated. Its control loop is factory-tuned for stability with standard 4.7 µH inductors and 4.7 µF ceramic capacitors - eliminating the need for external RC networks. This simplifies layout, reduces BOM count, and guarantees consistent transient response across production units. The MCP1603-180I/MC achieves this using an integrated error amplifier and slope compensation tailored to its fixed 1.8 V output configuration.
What protection features are built into the MCP1603-180I/MC?
The MCP1603-180I/MC integrates undervoltage lockout (UVLO), overtemperature shutdown, and cycle-by-cycle overcurrent protection. UVLO activates below 2.28 V (typ) with 140 mV hysteresis; thermal shutdown triggers at 150°C (typ) with 10°C hysteresis; and current limiting trips at 860 mA (typ) peak switch current. These features operate autonomously - no external circuitry is required. All protections reset automatically once fault conditions clear, and the MCP1603-180I/MC resumes regulation without latch-up.
How does the MCP1603-180I/MC manage efficiency across varying load conditions?
The MCP1603-180I/MC automatically transitions between 2.0 MHz PWM mode (heavy load) and PFM mode (light load) to maximize efficiency across the full 0–500 mA range. At full load, PWM delivers low-noise, low-ripple regulation; at light loads, PFM reduces switching frequency and quiescent current to 45 µA (typ), significantly extending battery life. This seamless transition requires no external control signals - the MCP1603-180I/MC handles it entirely in hardware.
Is the MCP1603-180I/MC pin-compatible with other variants in the MCP1603/B/L family?
Yes, the MCP1603-180I/MC shares identical pinout and package (5-lead TSOT-23) with other MCP1603 and MCP1603B variants, including adjustable-output and alternate fixed-voltage versions (e.g., 1.2 V, 3.3 V). All share VIN, GND, SHDN, VFB/VOUT, and LX pin assignments per Table 3-1 of DS22042B. This allows drop-in replacement within the same package footprint when output voltage requirements change - provided external components (e.g., output capacitor ESR) remain compatible with the new regulation point.
MCP1603-180I/MC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-VFDFN Exposed Pad
- Packaging:
- Tube
- 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:
- 8-DFN (2x3)
MCP1603-180I/MC FAQ
1.How can I place an order for MCP1603-180I/MC through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1603-180I/MC 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 MCP1603-180I/MC reliable?
The price and inventory of MCP1603-180I/MC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1603-180I/MC is usually 5 days.
3.What payment methods are accepted for MCP1603-180I/MC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1603-180I/MC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1603-180I/MC?
MCP1603-180I/MC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1603-180I/MC 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 MCP1603-180I/MC?
For technical support, including MCP1603-180I/MC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1603-180I/MC requirements.
6.How does Aetrix verify that MCP1603-180I/MC is sourced from the original manufacturer or authorized distributors?
All MCP1603-180I/MC 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 MCP1603-180I/MC meets industry standards.
7.What is the process for return or replacement of MCP1603-180I/MC?
All MCP1603-180I/MC units undergo pre-shipment inspection (PSI). If there is an issue with MCP1603-180I/MC, 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 MCP1603-180I/MC part is unused and in its original packaging.
Return procedure for MCP1603-180I/MC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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