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Microchip Technology MCP1603T-ADJI/MC
- Part No.:
- MCP1603T-ADJI/MC
- Manufacturer:
- Microchip Technology
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
MCP1603T-ADJI/MC.pdf
- Description:
- IC REG BUCK ADJ 500MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,295
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Product details
Overview
MCP1603T-ADJI/MC from Microchip Technology is a 2.0 MHz, 500 mA synchronous buck DC-DC regulator optimized for single-cell Li-Ion (2.7–5.5 V input) and USB-powered portable systems. It delivers adjustable output voltage from 0.8 V to 4.5 V with 0.8 V feedback reference, 45 µA typical PFM quiescent current, and integrated overtemperature/UVLO protection. It is used in battery-powered digital cameras and headsets requiring high light-load efficiency.
For engineers reviewing the MCP1603T-ADJI/MC datasheet, MCP1603T-ADJI/MC pinout, MCP1603T-ADJI/MC application, or MCP1603T-ADJI/MC equivalent, key selection criteria include its PFM/PWM auto-transition mode, 5-lead TSOT-23 package compatibility, 0.8 V reference tolerance (±2.5% over –40°C to +85°C), and requirement for external resistor divider in adjustable-output configurations.
Technical Context
The MCP1603T-ADJI/MC implements a current-mode synchronous buck topology with integrated P- and N-channel MOSFETs, enabling 90%+ typical efficiency across 0.1–500 mA load range. Its dual-mode operation-2.0 MHz fixed-frequency PWM under heavy load and pulse-skipping PFM at light load-minimizes quiescent draw while maintaining low output ripple (10–15 mV typical).
It features internal compensation, soft-start control, cycle-by-cycle overcurrent limiting (860 mA peak), undervoltage lockout (2.28 V typical, 140 mV hysteresis), and thermal shutdown (150°C typical, 10°C hysteresis). The device requires no external compensation network when used in fixed-output variants but mandates R-C compensation for stable regulation in adjustable configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 5.5 V - supports direct connection to single Li-Ion or 2–3 cell NiMH/NiCd batteries without pre-regulation. |
| Output Current | Up to 500 mA continuous - sufficient for powering core logic or RF sections in portable devices. |
| Switching Frequency | 2.0 MHz (typical) - enables use of small 4.7 µH inductors and 4.7 µF ceramic capacitors, minimizing solution footprint. |
| Feedback Reference Voltage | 0.8 V ±2.5% (–40°C to +85°C) - sets output via external resistor divider; determines accuracy of adjustable VOUT. |
| Quiescent Current (PFM) | 45 µA (typical) - extends battery runtime in standby or low-power sensor modes. |
| Shutdown Current | 0.1 µA (typical) - ensures near-zero drain during system sleep or power-off states. |
| Protection Features | UVLO (2.28 V), thermal shutdown (150°C), cycle-by-cycle current limit (860 mA) - prevents damage under fault conditions without external circuitry. |
Pinout & Package
Package: 5-Lead TSOT-23 (MCP1603/MCP1603B variant), lead pitch 0.95 mm, body size 2.9 mm × 1.6 mm × 1.1 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power supply input | Accepts 2.7–5.5 V; must be decoupled with ≥4.7 µF low-ESR ceramic capacitor close to pin. |
| GND | Ground reference | Primary return path for power and control circuits; minimal loop area critical for EMI and stability. |
| SHDN | Enable/disable control | Logic-high (>45% VIN) enables regulator; logic-low (<15% VIN) disables output and reduces IIN to 0.1 µA. |
| VFB/VOUT | Feedback node | Connects to center of external resistor divider for adjustable outputs; ties directly to VOUT for fixed versions. |
| LX | Switch node | Drives buck inductor; carries high di/dt current - requires short, low-inductance PCB trace to minimize ringing and EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Auto PFM-to-PWM transition | Enables seamless efficiency optimization: 45 µA quiescent current at light load, <15 mV ripple at full 500 mA with 2.0 MHz switching. |
| Internally compensated | Eliminates need for external compensation components in fixed-output configurations; simplifies layout and BOM. |
| 100% duty cycle operation | Supports VOUT ≈ VIN operation (e.g., 4.2 V → 3.3 V), reducing dropout loss in battery discharge tail-end. |
| Integrated MOSFETs | P- and N-channel synchronous switches reduce conduction losses vs. external diode solutions; RDS(on) = 500 mΩ each at 100 mA. |
| Thermal pad not present | TSOT-23 package lacks exposed thermal pad - thermal resistance θJA = 207.4°C/W on 4-layer board with internal ground plane. |
Applications
| Portable Digital Cameras | USB-Powered Headsets |
|---|---|
Use Scenario: Powering image sensor and ISP core from single Li-Ion cell during burst capture mode. IC Role / Device Role / Timing Role: Primary 1.8 V/500 mA buck regulator delivering stable rail with fast transient response to sensor clocking demands. Use Value: 90%+ efficiency at 300 mA preserves battery life; PFM mode extends standby time between shots without compromising startup latency. | Use Scenario: Regulating clean 3.3 V rail for Bluetooth audio codec and MEMS microphone from 5 V USB bus. IC Role / Device Role / Timing Role: Step-down converter providing low-noise, ripple-controlled supply independent of USB port voltage variation. Use Value: 2.0 MHz fixed PWM minimizes conducted EMI near sensitive analog audio paths; UVLO prevents brownout-induced audio artifacts. |
| Handheld Organizers (PDAs) | Li-Ion Battery Backup Systems |
Use Scenario: Supplying 1.2 V core voltage to ARM-based application processor during active UI navigation. IC Role / Device Role / Timing Role: Adjustable-output buck regulator dynamically configured for process-voltage scaling. Use Value: 0.8 V reference with ±2.5% tolerance ensures accurate VOUT setting across temperature; soft-start prevents inrush-induced system reset. | Use Scenario: Maintaining real-time clock and SRAM retention during main power failure using backup Li-Ion cell. IC Role / Device Role / Timing Role: Low-quiescent-current buck converter sustaining 3.3 V rail at microamp-level loads. Use Value: 45 µA PFM IQ enables >1-year backup runtime; thermal shutdown protects against cell overdischarge-induced heating. |
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 3.3 V output only; 2.25 MHz switching; 30 µA IQ in PFM; no adjustable option. | Suitable for space-constrained USB peripherals where fixed 3.3 V suffices and lower IQ is prioritized. | Select if fixed output and ultra-low quiescent current outweigh need for voltage flexibility. |
| RT8059GJ6 | Adjustable 0.6–5.5 V output; 1.5 MHz switching; 22 µA IQ; requires external compensation. | Better suited for wide-input industrial sensors needing tighter VREF (0.6 V ±1%) and higher VIN max (6 V). | Choose when wider input range, lower VREF, or higher ambient temp rating (+125°C) is required. |
Compared with TPS62231DRYR and RT8059GJ6, the MCP1603T-ADJI/MC offers unique support for both adjustable and multiple fixed outputs in the same family, integrated compensation for fixed variants, and proven robustness in consumer portable designs - making it optimal for cost-sensitive, volume-manufactured handhelds.
Availability
MCP1603T-ADJI/MC is available at Aetrix Electronics and suitable for portable digital cameras, USB-powered headsets, and handheld organizers requiring stable component supply with consistent parametric performance across production lots.
Supply support for MCP1603T-ADJI/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 product line was designed specifically for compact, high-efficiency DC-DC conversion in battery-powered portable electronics - emphasizing low IQ, small solution size, and seamless mode transition without external control logic.
FAQ
What is the recommended input capacitor for MCP1603T-ADJI/MC?
The MCP1603T-ADJI/MC requires a minimum 4.7 µF low-ESR ceramic capacitor (X5R or X7R dielectric) placed as close as possible to the VIN and GND pins. This value satisfies RMS current handling and input voltage transient suppression per Microchip's DS22042B design guidelines. Larger values up to 22 µF may improve hold-up time but are not required for basic operation.
Does MCP1603T-ADJI/MC support 100% duty cycle operation?
Yes, the MCP1603T-ADJI/MC supports 100% duty cycle operation, allowing VOUT to approach VIN minus small dropout - critical for maintaining regulation near end-of-discharge in Li-Ion cells. This behavior is confirmed in Section 4.1 of DS22042B and enables efficient operation down to ~2.8 V input for a 2.5 V output.
What is the feedback reference voltage tolerance of MCP1603T-ADJI/MC over temperature?
The MCP1603T-ADJI/MC has a feedback reference voltage (VFB) of 0.8 V with ±2.5% tolerance over the operating junction temperature range of –40°C to +85°C, as specified in DS22042B Page 6. At room temperature (–40°C to +25°C), tolerance tightens to ±3.0%.
Can MCP1603T-ADJI/MC be used without an external compensation network?
Yes - the MCP1603T-ADJI/MC is internally compensated and requires no external R-C network when used in fixed-output configurations. However, for adjustable-output applications (like MCP1603T-ADJI/MC), a 4.99 kΩ resistor and 33 pF capacitor are mandatory for loop stability, as detailed in Figure 6-2 and Section 5.3 of DS22042B.
What package type does MCP1603T-ADJI/MC use, and is thermal pad required?
MCP1603T-ADJI/MC uses the 5-lead TSOT-23 package (not DFN), which does not include an exposed thermal pad. Its thermal resistance is θJA = 207.4°C/W on a standard 4-layer PCB with internal ground plane - no solder paste or vias to thermal pad are needed or applicable.
MCP1603T-ADJI/MC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-VFDFN 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):
- 4.5V
- Current - Output:
- 500mA
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (2x3)
MCP1603T-ADJI/MC FAQ
1.How can I place an order for MCP1603T-ADJI/MC through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1603T-ADJI/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 MCP1603T-ADJI/MC reliable?
The price and inventory of MCP1603T-ADJI/MC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1603T-ADJI/MC is usually 5 days.
3.What payment methods are accepted for MCP1603T-ADJI/MC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1603T-ADJI/MC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1603T-ADJI/MC?
MCP1603T-ADJI/MC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1603T-ADJI/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 MCP1603T-ADJI/MC?
For technical support, including MCP1603T-ADJI/MC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1603T-ADJI/MC requirements.
6.How does Aetrix verify that MCP1603T-ADJI/MC is sourced from the original manufacturer or authorized distributors?
All MCP1603T-ADJI/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 MCP1603T-ADJI/MC meets industry standards.
7.What is the process for return or replacement of MCP1603T-ADJI/MC?
All MCP1603T-ADJI/MC units undergo pre-shipment inspection (PSI). If there is an issue with MCP1603T-ADJI/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 MCP1603T-ADJI/MC part is unused and in its original packaging.
Return procedure for MCP1603T-ADJI/MC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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