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Microchip Technology MCP1603T-180I/MC
- Part No.:
- MCP1603T-180I/MC
- Manufacturer:
- Microchip Technology
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
MCP1603T-180I/MC.pdf
- Description:
- IC REG BUCK 1.8V 500MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,706
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Product details
Overview
MCP1603T-180I/MC from Microchip Technology is a fixed-output 1.8 V, 500 mA synchronous buck DC-DC converter 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/overcurrent/UVLO protection.
For engineers reviewing the MCP1603T-180I/MC datasheet, MCP1603T-180I/MC pinout, MCP1603T-180I/MC application, or MCP1603T-180I/MC equivalent, this page provides verified technical context, package mapping, real-world design meaning of key specs, validated alternatives, and supply support for high-volume portable power designs.
Technical Context
The MCP1603T-180I/MC implements a current-mode synchronous buck topology with integrated 500 mΩ P-channel and N-channel MOSFETs. Its 2.0 MHz fixed-frequency PWM operation under heavy load ensures low output ripple (10–15 mV) and enables compact LC filtering using 4.7 µH inductors and 4.7 µF ceramic capacitors.
Under light load, it transitions automatically to PFM mode with 45 µA typical quiescent current, minimizing battery drain. The device includes soft-start, undervoltage lockout (2.28 V typ, 140 mV hysteresis), thermal shutdown (150 °C), and cycle-by-cycle peak current limiting (860 mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±2.5% over –40°C to +85°C - eliminates external feedback divider and simplifies layout. |
| Max Output Current | 500 mA continuous - supports core logic rails in handheld devices without external boost stages. |
| 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. |
| Switching Frequency | 2.0 MHz (typ) - enables use of small 4.7 µH inductors and 4.7 µF ceramic caps, reducing solution footprint by >40% vs. 500 kHz designs. |
| Quiescent Current | 45 µA (PFM mode, typ) - extends battery runtime in standby/sleep states of PDAs and headsets. |
| Efficiency | >90% (typ) at 500 mA, VIN = 3.6 V, VOUT = 1.8 V - reduces thermal load in sealed enclosures and improves system-level energy density. |
| Protection Features | UVLO (2.28 V), thermal shutdown (150 °C), overcurrent (860 mA peak), soft-start - ensures robust operation during battery sag or transient overload. |
Pinout & Package
Package: 5-Lead TSOT-23 (MCP1603 variant), lead pitch 0.95 mm, body size 2.9 mm × 1.6 mm × 1.1 mm, exposed pad not present.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VIN | Input power supply (2.7–5.5 V); requires local 4.7 µF ceramic decoupling to GND for stable regulation. |
| 2 | GND | Power ground reference; must be connected to low-impedance PCB ground plane to minimize noise and thermal resistance. |
| 3 | SHDN | Active-high enable control (VIH > 45% VIN); pulls low to disable regulator and reduce input current to 0.1 µA (typ). |
| 4 | VFB/VOUT | Fixed 1.8 V output node; directly connects to load; no external resistor divider required. |
| 5 | LX | Switch node connecting internal MOSFETs to external inductor; carries high di/dt current - trace must be short and wide. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Synchronous FETs | Eliminates external diode and reduces conduction loss - enables >90% efficiency at 500 mA without heatsinking. |
| Automatic PFM/PWM Transition | Enables ultra-low IQ (45 µA) in sleep mode while maintaining fast transient response and low ripple in active mode. |
| Internally Compensated | Requires only 3 external components (CIN, COUT, L) - accelerates design-in and eliminates compensation tuning effort. |
| 100% Duty Cycle Operation | Supports dropout operation down to VOUT + headroom - maintains regulation as battery voltage declines to 1.8 V + ~0.3 V. |
| Thermal Shutdown with Hysteresis | Shuts down at 150 °C (typ), restarts at ~140 °C - prevents thermal runaway during sustained overload in compact enclosures. |
Applications
| Portable Medical Sensors | Digital Audio Headsets |
|---|---|
Use Scenario: Wearable glucose monitors powered by coin-cell or single Li-Poly batteries requiring stable 1.8 V for microcontroller and sensor interface. IC Role / Device Role / Timing Role: Primary step-down regulator delivering regulated 1.8 V rail to MCU, ADC, and BLE radio subsystems. Use Value: 45 µA PFM quiescent current extends battery life beyond 7 days in sleep mode; 2.0 MHz switching avoids audible noise in audio-sensitive environments. | Use Scenario: Bluetooth stereo headsets with dual-core DSP and MEMS microphones operating from 3.7 V Li-Ion cells. IC Role / Device Role / Timing Role: Core power supply for digital baseband ICs and low-noise analog front-end circuitry. Use Value: >90% efficiency at 300–500 mA load minimizes heat buildup inside earcup; fixed 1.8 V output ensures consistent logic threshold margins across temperature. |
| USB-Powered Test Instruments | Industrial Handheld Scanners |
Use Scenario: Portable oscilloscope probes and signal generators drawing power exclusively from USB 5 V bus. IC Role / Device Role / Timing Role: Input-stage buck converter stepping USB 5 V down to 1.8 V for FPGA configuration and ADC reference rails. Use Value: 2.7–5.5 V input range accepts USB voltage tolerance (4.75–5.25 V); 2.0 MHz operation allows use of miniature 0805 inductors and saves >25 mm² PCB area. | Use Scenario: Rugged barcode scanners used in warehouse logistics, powered by hot-swappable 3.6 V NiMH packs. IC Role / Device Role / Timing Role: Main system regulator supplying 1.8 V to ARM Cortex-M4 MCU, image sensor, and laser driver. Use Value: UVLO (2.28 V) and thermal shutdown ensure safe operation during deep discharge or high-ambient-temperature operation (>60 °C). |
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, 3.6 MHz switching, 17 µA IQ (PFM), DSBGA-6 package (1.0 × 1.5 mm) | Higher frequency enables smaller passives but increases EMI sensitivity; lower IQ benefits ultra-low-power sleep modes. | Select when board space is critical and EMI filtering can be implemented; avoid if input voltage dips below 2.05 V (UVLO threshold). |
| RT8059ZSP | Fixed 1.8 V, 600 mA, 1.5 MHz, 30 µA IQ (PFM), TSOT-23-5 package, no internal compensation | Requires external compensation network; higher current rating suits margin-critical designs; lower switching frequency eases EMI compliance. | Select when 600 mA headroom is needed or when 1.5 MHz operation better fits system clock domain; verify loop stability with recommended RC network. |
Compared with TPS62231DRYR and RT8059ZSP, MCP1603T-180I/MC offers superior thermal performance in TSOT-23 due to lower RDS(on) and proven 125 °C junction rating, making it preferred for industrial handhelds where ambient temperature exceeds 60 °C.
Availability
MCP1603T-180I/MC is available at Aetrix Electronics and suitable for portable medical sensors, digital audio headsets, USB-powered test instruments, and industrial handheld scanners requiring stable component supply and long-term manufacturability.
Supply support for MCP1603T-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 microcontrollers, 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 delivers compact, high-efficiency synchronous buck regulators specifically engineered for battery-powered portable electronics where size, efficiency, and thermal performance are primary constraints.
FAQ
What is the minimum input voltage required for MCP1603T-180I/MC to regulate 1.8 V output?
The MCP1603T-180I/MC requires a minimum input voltage of approximately 2.1 V to maintain regulation at 1.8 V output, based on its 2.28 V typical UVLO threshold with 140 mV hysteresis and internal headroom. At full 500 mA load, VIN should remain ≥2.7 V per datasheet specifications to ensure stable operation across temperature.
Does MCP1603T-180I/MC require external compensation components?
No, MCP1603T-180I/MC is internally compensated. For the fixed 1.8 V version, only three external components are needed: a 4.7 µF input capacitor, a 4.7 µF output capacitor, and a 4.7 µH inductor. No feedback resistors or compensation network is required.
Can MCP1603T-180I/MC operate with a 2.5 V input source?
Yes, MCP1603T-180I/MC supports input voltages from 2.7 V to 5.5 V. A 2.5 V source falls below the 2.7 V minimum specified operating input voltage and will not reliably sustain regulation; the device will remain in UVLO state and produce no output.
What is the thermal resistance (θJA) of MCP1603T-180I/MC in its TSOT-23 package?
The thermal resistance θJA for MCP1603T-180I/MC in the 5-lead TSOT-23 package is 207.4 °C/W on a typical 4-layer PCB with internal ground plane, as specified in DS22042B-page 6. This value assumes standard copper pour and via placement per Microchip's layout guidelines.
Is MCP1603T-180I/MC pin-compatible with other variants in the MCP1603/B/L family?
Yes, MCP1603T-180I/MC shares identical pinout and footprint with all MCP1603 and MCP1603B variants in the 5-lead TSOT-23 package (e.g., MCP1603T-330I/MC, MCP1603B-180I/MC), enabling drop-in replacement for different output voltages or PWM-only operation without PCB redesign.
MCP1603T-180I/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:
- 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)
MCP1603T-180I/MC FAQ
1.How can I place an order for MCP1603T-180I/MC through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1603T-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 MCP1603T-180I/MC reliable?
The price and inventory of MCP1603T-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 MCP1603T-180I/MC is usually 5 days.
3.What payment methods are accepted for MCP1603T-180I/MC?
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4.How is shipping managed for MCP1603T-180I/MC?
MCP1603T-180I/MC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1603T-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 MCP1603T-180I/MC?
For technical support, including MCP1603T-180I/MC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1603T-180I/MC requirements.
6.How does Aetrix verify that MCP1603T-180I/MC is sourced from the original manufacturer or authorized distributors?
All MCP1603T-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 MCP1603T-180I/MC meets industry standards.
7.What is the process for return or replacement of MCP1603T-180I/MC?
All MCP1603T-180I/MC units undergo pre-shipment inspection (PSI). If there is an issue with MCP1603T-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 MCP1603T-180I/MC part is unused and in its original packaging.
Return procedure for MCP1603T-180I/MC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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