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Microchip Technology MCP1603-150I/MC
- Part No.:
- MCP1603-150I/MC
- Manufacturer:
- Microchip Technology
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
MCP1603-150I/MC.pdf
- Description:
- IC REG BUCK 1.5V 500MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,808
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Product details
Overview
MCP1603-150I/MC from Microchip Technology is a 500 mA synchronous buck DC-DC regulator optimized for single-cell Li-Ion (2.7–5.5 V input) and USB-powered systems, delivering fixed 1.5 V output with >90% typical efficiency, 2.0 MHz PWM switching, and 45 µA PFM quiescent current. It integrates P-channel and N-channel MOSFETs, internal compensation, UVLO, overtemperature protection, and operates in TSOT-23-5 package.
For engineers reviewing the MCP1603-150I/MC datasheet, MCP1603-150I/MC pinout, MCP1603-150I/MC application, or MCP1603-150I/MC equivalent, this page provides verified technical context, validated pin functions, confirmed fixed-output behavior at 1.5 V, real-world efficiency curves across load and input voltage, and precise alternative selection guidance for portable power design.
Technical Context
The MCP1603-150I/MC is a fixed-output variant of the MCP1603/L family, configured for 1.5 V output without external feedback resistors. It operates exclusively in automatic PWM-to-PFM mode transition-enabling high efficiency (>90% at 300 mA, VIN = 3.6 V) under heavy load and ultra-low 45 µA quiescent current in light-load PFM mode.
Its 2.0 MHz fixed-frequency PWM operation minimizes output ripple (10–15 mV typical) and enables use of small 4.7 µH inductors and 4.7 µF ceramic capacitors. Internal cycle-by-cycle current limiting (860 mA peak), undervoltage lockout (2.28 V typ, 140 mV hysteresis), and thermal shutdown (150 °C) ensure robust operation in battery-constrained environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.5 V ±2.5% over –40°C to +85°C - eliminates need for external feedback divider and simplifies layout. |
| Max Output Current | 500 mA continuous - supports core logic rails in portable devices without external current boosting. |
| Input Voltage Range | 2.7 V to 5.5 V - compatible with 1-cell Li-Ion, 2–3-cell NiMH/NiCd, and USB 5 V sources. |
| Quiescent Current (PFM) | 45 µA typical - extends battery life in standby or low-duty-cycle modes (e.g., Bluetooth headsets). |
| Switching Frequency | 2.0 MHz typical - allows compact LC filter design (4.7 µH/4.7 µF) and reduces EMI below sensitive RF bands. |
| Efficiency | >90% typical at 300 mA, VIN = 3.6 V, VOUT = 1.5 V - minimizes thermal rise in space-constrained TSOT-23 packaging. |
| Protection Features | UVLO (2.28 V, 140 mV hysteresis), overtemperature shutdown (150 °C), cycle-by-cycle current limit (860 mA) - ensures safe operation during brownout or overload. |
Pinout & Package
Package: 5-Lead TSOT-23 (Moisture Sensitivity Level 1, RoHS-compliant). Thermal pad not present - standard TSOT-23 footprint with no exposed EP.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Power supply input | Accepts 2.7–5.5 V; requires local 4.7 µF ceramic decoupling to GND for stable switching. |
| 2 (GND) | Ground reference | Primary return path for power and control circuits; must be low-inductance connection to minimize noise coupling. |
| 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) | Feedback / output sense | Internally connected to 1.5 V reference; connect directly to output node - no external resistor network required. |
| 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 PWM-to-PFM mode transition | Enables >90% efficiency at full load and 45 µA quiescent current at light load - no external control needed. |
| Internally compensated architecture | Eliminates external compensation components - reduces BOM count and layout complexity for 1.5 V fixed-output use. |
| 100% duty cycle capability | Supports dropout operation down to VIN ≈ VOUT - critical for Li-Ion end-of-discharge (e.g., 1.5 V out from 1.8 V cell). |
| Integrated MOSFETs (P-CH + N-CH) | RDS(on) ≤ 500 mΩ each - achieves high efficiency without discrete switch losses or gate-drive circuitry. |
| Low-noise 2.0 MHz PWM operation | Confines switching harmonics above 100 MHz - eases EMI filtering and avoids interference with 2.4 GHz ISM band. |
Applications
| Portable Audio Headsets | USB-Powered Sensors |
|---|---|
Use Scenario: Compact Bluetooth headset requiring regulated 1.5 V for codec and RF section from single Li-Ion cell. IC Role / Device Role / Timing Role: Primary step-down regulator supplying clean, low-noise 1.5 V rail with fast transient response to audio burst loads. Use Value: 45 µA PFM quiescent current extends standby time beyond 100 hours; 2.0 MHz switching avoids audible coil whine. |
Use Scenario: Low-power environmental sensor node powered via USB 5 V, needing stable 1.5 V for analog front-end and MCU core. IC Role / Device Role / Timing Role: Input-conditioning buck converter enabling direct USB operation without intermediate 3.3 V stage. Use Value: Fixed 1.5 V output eliminates feedback resistor tolerance error; >90% efficiency reduces self-heating in sealed enclosure. |
| Handheld Medical Monitors | Wearable Fitness Trackers |
Use Scenario: Battery-operated pulse oximeter using 1.5 V for precision ADC and optical driver circuitry. IC Role / Device Role / Timing Role: Precision power source maintaining tight output tolerance (±2.5%) across temperature for measurement accuracy. Use Value: UVLO (2.28 V) and thermal shutdown (150 °C) prevent malfunction during clinical use; TSOT-23 fits tight board area. |
Use Scenario: Slim wrist-worn tracker drawing intermittent 500 mA bursts for GPS acquisition, powered by 1-cell Li-Ion. IC Role / Device Role / Timing Role: High-current, low-profile regulator delivering 1.5 V to RF and sensor subsystems with minimal thermal rise. Use Value: 500 mA capability supports GPS peak load; 2.0 MHz switching enables use of tiny 4.7 µH inductor for thickness reduction. |
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 1.5 V output, 600 mA, 3.6 MHz switching, 17 µA quiescent current - higher frequency, lower IQ, but requires minimum 10 mA load. | Preferred for ultra-low-power always-on sensors where 17 µA IQ outweighs need for minimum load compliance. | Select when board space permits smaller inductor (2.2 µH) and system can guarantee ≥10 mA load during regulation. |
| Analog Devices ADP2301AUJZ-1.5-R7 | Fixed 1.5 V, 600 mA, 700 kHz switching, 2.5 mA quiescent current - lower frequency, higher IQ, no PFM mode. | Suitable for noise-insensitive industrial modules where EMI filtering is simpler at 700 kHz and load is consistently >50 mA. | Choose when predictable fixed-frequency behavior is prioritized over light-load efficiency and PCB area is less constrained. |
Compared with MCP1603-150I/MC, TPS62231DRYR offers lower quiescent current but mandates minimum load compliance, while ADP2301AUJZ-1.5-R7 trades efficiency for deterministic 700 kHz operation - MCP1603-150I/MC uniquely balances 45 µA PFM IQ, 500 mA capability, and zero-minimum-load flexibility in TSOT-23.
Availability
MCP1603-150I/MC is available at Aetrix Electronics and suitable for portable medical monitors, USB-powered sensors, wearable fitness trackers, and Bluetooth headsets requiring stable component supply with long-term lifecycle support.
Supply support for MCP1603-150I/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 mixed-signal ICs, with expertise in low-power, high-integration power management solutions for portable and embedded systems.
The MCP1603/B/L product line delivers compact, efficient synchronous buck regulators targeting battery-powered consumer and medical devices - designed specifically for minimal external component count and seamless integration into space-constrained layouts.
FAQ
What is the output voltage tolerance of the MCP1603-150I/MC over temperature?
The MCP1603-150I/MC maintains ±2.5% output voltage tolerance over the full operating temperature range of –40°C to +85°C. This specification is confirmed in the DC Characteristics table (DS22042B-page 5), where fixed-output voltage tolerance is explicitly stated as –2.5% to +2.5% under TA = +25°C to +85°C conditions. The 1.5 V nominal output thus remains within 1.4625 V to 1.5375 V across industrial temperature extremes.
Does the MCP1603-150I/MC require external compensation components?
No, the MCP1603-150I/MC is internally compensated - a key feature confirmed in the General Description and Features sections of DS22042B. Because it is a fixed-output variant (1.5 V), no external RC compensation network is needed. This eliminates two passive components and associated layout sensitivity, distinguishing it from adjustable versions that require RCOMP and CCOMP per Figure 6-2.
What is the minimum load requirement for regulation on the MCP1603-150I/MC?
The MCP1603-150I/MC has no minimum load requirement for regulation. Unlike the PWM-only MCP1603B variants, the MCP1603-150I/MC belongs to the MCP1603/L family and supports automatic PWM-to-PFM mode transition. As documented in Section 4.2.1.1 and Figure 2-15, PFM operation enables stable regulation down to near-zero load - confirmed by 45 µA quiescent current spec and absence of minimum-load curves for this part number.
Can the MCP1603-150I/MC operate with a 2.5 V input voltage?
Yes, the MCP1603-150I/MC supports input voltages as low as 2.7 V per Absolute Maximum Ratings and Electrical Characteristics tables (DS22042B-page 5). A 2.5 V input falls below the specified 2.7 V minimum and will trigger undervoltage lockout (UVLO), disabling regulation. Operation requires VIN ≥ 2.7 V - consistent with its target use case of 1-cell Li-Ion (nominal 3.6 V, discharge to ~2.8 V) and USB-powered systems.
What package type is used for the MCP1603-150I/MC?
The MCP1603-150I/MC uses the 5-Lead TSOT-23 package, as confirmed by the "Package Types" diagram on DS22042B-page 2 and Pin Function Table on page 13. This variant corresponds to the "MCP1603/MCP1603B TSOT" configuration - distinct from the 8-lead DFN (MCP1603) or alternate TSOT pinout (MCP1603L). The suffix "I/MC" denotes Industrial temperature grade (–40°C to +85°C) in TSOT-23.
MCP1603-150I/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):
- 1.5V
- 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)
MCP1603-150I/MC FAQ
1.How can I place an order for MCP1603-150I/MC through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1603-150I/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 MCP1603-150I/MC reliable?
The price and inventory of MCP1603-150I/MC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1603-150I/MC is usually 5 days.
3.What payment methods are accepted for MCP1603-150I/MC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1603-150I/MC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1603-150I/MC?
MCP1603-150I/MC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1603-150I/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 MCP1603-150I/MC?
For technical support, including MCP1603-150I/MC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1603-150I/MC requirements.
6.How does Aetrix verify that MCP1603-150I/MC is sourced from the original manufacturer or authorized distributors?
All MCP1603-150I/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 MCP1603-150I/MC meets industry standards.
7.What is the process for return or replacement of MCP1603-150I/MC?
All MCP1603-150I/MC units undergo pre-shipment inspection (PSI). If there is an issue with MCP1603-150I/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 MCP1603-150I/MC part is unused and in its original packaging.
Return procedure for MCP1603-150I/MC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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