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Microchip Technology MCP1603LT-330I/OS
- Part No.:
- MCP1603LT-330I/OS
- Manufacturer:
- Microchip Technology
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MCP1603LT-330I/OS.pdf
- Description:
- IC REG BUCK 3.3V 500MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MCP1603LT-330I/OS from Microchip Technology is a fixed-output 3.3V, 500 mA synchronous buck regulator optimized for single-cell Li-Ion and multi-cell NiMH/NiCd battery-powered portable electronics. It operates from 2.7V to 5.5V input, delivers >90% typical efficiency at full load, features 2.0 MHz PWM switching, automatic PFM-to-PWM mode transition, and integrated overtemperature and overcurrent protection. Used in USB-powered devices and digital cameras for compact, low-noise 3.3V rail generation.
For engineers reviewing the MCP1603LT-330I/OS datasheet, MCP1603LT-330I/OS pinout, MCP1603LT-330I/OS application, or MCP1603LT-330I/OS equivalent, key selection criteria include its fixed 3.3V output, 45 µA PFM quiescent current, TSOT-23-5 package with validated 5-pin mapping, and compatibility with minimal external components (4.7 µF CIN/COUT, 4.7 µH inductor).
Technical Context
The MCP1603LT-330I/OS implements a current-mode synchronous buck architecture with integrated P- and N-channel MOSFETs, enabling high 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 output ripple (<15 mV typical) while maintaining 45 µA typical quiescent current.
It incorporates undervoltage lockout (2.28 V nominal, 140 mV hysteresis), thermal shutdown at 150°C (10°C hysteresis), cycle-by-cycle peak current limiting (860 mA), and soft-start control. The device requires no external compensation when used in fixed-output configuration and supports 100% duty cycle for ultra-low dropout operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2.5% over –40°C to +85°C; eliminates need for external feedback divider. |
| Max Output Current | 500 mA continuous; supports power rails for microcontrollers, sensors, and USB peripherals. |
| Input Voltage Range | 2.7V to 5.5V; compatible with 1-cell Li-Ion (2.7–4.2V) and 2/3-cell NiMH/NiCd (2.4–4.5V) batteries. |
| Quiescent Current (PFM) | 45 µA typical; extends battery life in standby/sleep modes of portable equipment. |
| Switching Frequency | 2.0 MHz typical (1.5–2.8 MHz range); enables use of small 4.7 µH inductors and 4.7 µF ceramic capacitors. |
| Efficiency | >90% typical at 500 mA (VIN = 3.6V, VOUT = 3.3V); reduces thermal load in space-constrained layouts. |
| Protection Features | UVLO (2.28 V), overtemperature shutdown (150°C), and cycle-by-cycle overcurrent limit (860 mA). |
Pinout & Package
Package: 5-lead TSOT-23 (thin small outline transistor), lead-free, RoHS-compliant, 0.95 mm profile. Thermal pad not present - standard TSOT-23 variant per DS22042B-page 2 and Table 3-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Power supply input | Accepts 2.7–5.5V; requires local 4.7 µF low-ESR ceramic decoupling to GND. |
| 2 (GND) | Ground reference | Primary return path for power and control circuits; minimize loop area for EMI reduction. |
| 3 (SHDN) | Enable/disable logic input | Active-high control: >45% VIN enables regulation; <15% VIN disables with 0.1 µA shutdown current. |
| 4 (VFB/VOUT) | Output voltage sense / feedback | Internally connected to 3.3V output; no external resistor divider required for fixed-output operation. |
| 5 (LX) | Switch node | Connects directly to buck inductor; carries high di/dt current - keep trace short and wide. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic PFM/PWM mode transition | Enables >90% efficiency at full load and 45 µA quiescent current at light load without external control. |
| Internally compensated fixed-output design | Eliminates external compensation network - only 3 passive components (CIN, COUT, L) needed for full solution. |
| 100% duty cycle capability | Supports ultra-low dropout operation (e.g., VIN = 3.4V → VOUT = 3.3V), critical for end-of-battery-life operation. |
| Integrated MOSFETs with low RDS(on) | 500 mΩ (P-ch) and 500 mΩ (N-ch) typical - minimizes conduction loss and simplifies layout vs. controller+external FETs. |
| Robust protection suite | UVLO, thermal shutdown (150°C), and cycle-by-cycle current limit (860 mA) ensure reliable operation under fault conditions. |
Applications
| Portable Medical Sensors | Digital Cameras |
|---|---|
Use Scenario: Powering low-power optical heart-rate sensors and Bluetooth LE transceivers in wearable patches. IC Role / Device Role / Timing Role: Primary 3.3V system rail regulator delivering stable voltage during intermittent sensor bursts and BLE advertising intervals. Use Value: 45 µA PFM quiescent current extends battery life beyond 7 days on coin-cell; 2.0 MHz switching avoids audible noise in audio-sensitive medical environments. |
Use Scenario: Supplying image sensor, ISP, and SD card interface in compact point-and-shoot cameras. IC Role / Device Role / Timing Role: Main 3.3V power stage converting 3.6V Li-Ion battery output with fast transient response to handle burst-mode image capture. Use Value: >90% efficiency at 500 mA reduces thermal stress on plastic camera housing; TSOT-23-5 footprint saves PCB area for lens module integration. |
| USB-Powered Test Equipment | Industrial Handheld Scanners |
Use Scenario: Regulating clean 3.3V rail from 5V USB host port for precision ADCs and RF front-ends in field calibration tools. IC Role / Device Role / Timing Role: Isolated DC-DC stage rejecting USB bus noise and providing regulated supply independent of host voltage droop. Use Value: 2.0 MHz fixed-frequency PWM ensures predictable EMI spectrum; low 15 mV output ripple prevents ADC quantization errors. |
Use Scenario: Powering barcode laser diode driver, CMOS imager, and wireless MCU in ruggedized warehouse scanners. IC Role / Device Role / Timing Role: High-reliability 3.3V source operating across wide temperature (–40°C to +85°C) and mechanical shock conditions. Use Value: Overtemperature shutdown (150°C) and UVLO (2.28 V) prevent malfunction during battery cold-start or thermal overload events. |
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 | 3.3V fixed, 500 mA, 3 MHz switching, 17 µA quiescent current (PFM), 6-pin WSON package. | Higher frequency allows smaller magnetics but tighter layout constraints; lower IQ benefits ultra-long-life battery apps. | Select when board space permits smaller inductor/capacitor and lowest possible standby current is critical. |
| RT8059NGSP | 3.3V fixed, 600 mA, 1.5 MHz switching, 25 µA quiescent current, 6-pin SOT-23 package with EN/PG pins. | Includes power-good indicator and higher current rating; lacks PFM mode - operates PWM-only with higher light-load IQ. | Select when system-level power sequencing or marginally higher output current (600 mA) is required. |
Compared with MCP1603LT-330I/OS, TPS62231DRYR offers lower quiescent current and higher switching frequency but requires more careful EMI filtering; RT8059NGSP provides power-good signaling and extra current headroom but sacrifices PFM efficiency at light loads.
Availability
MCP1603LT-330I/OS is available at Aetrix Electronics and suitable for portable medical sensors, digital cameras, USB-powered test equipment, and industrial handheld scanners requiring stable component supply and long-term production continuity.
Supply support for MCP1603LT-330I/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, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with high-reliability silicon and development tools.
The MCP1603/B/L family is designed specifically for space-constrained, battery-powered portable electronics requiring high-efficiency, low-quiescent-current DC-DC conversion with minimal external components.
FAQ
What is the input voltage range supported by the MCP1603LT-330I/OS?
The MCP1603LT-330I/OS supports an input voltage range of 2.7V to 5.5V. This makes it compatible with common portable power sources including single-cell Li-Ion batteries (2.7–4.2V), two- or three-cell NiMH/NiCd batteries (2.4–4.5V), and regulated 3.3V or 5V system rails. Operation below 2.7V is prevented by undervoltage lockout at 2.28V nominal.
Does the MCP1603LT-330I/OS require external feedback resistors?
No, the MCP1603LT-330I/OS does not require external feedback resistors. As a fixed 3.3V output variant, the VFB/VOUT pin is internally connected to the regulated output. Only three external components are needed: a 4.7 µF input capacitor, a 4.7 µF output capacitor, and a 4.7 µH inductor - enabling a minimal-footprint, fully integrated buck solution.
How does the MCP1603LT-330I/OS manage efficiency across varying load conditions?
The MCP1603LT-330I/OS automatically transitions between 2.0 MHz fixed-frequency PWM mode (for high efficiency and low ripple at medium-to-heavy loads) and pulse-frequency modulation (PFM) mode (for ultra-low 45 µA quiescent current at light loads). This dual-mode operation ensures >90% efficiency at 500 mA and extended battery runtime during standby, without requiring external mode-control circuitry.
What protection features are integrated into the MCP1603LT-330I/OS?
The MCP1603LT-330I/OS integrates undervoltage lockout (UVLO, 2.28 V nominal with 140 mV hysteresis), overtemperature shutdown (150°C junction, 10°C hysteresis), and cycle-by-cycle overcurrent protection (860 mA peak limit). These features protect both the IC and downstream circuitry during input brownout, thermal overload, or output short-circuit events - enhancing system reliability in portable applications.
Is the MCP1603LT-330I/OS pin-compatible with other variants in the MCP1603/B/L family?
Yes, the MCP1603LT-330I/OS uses the standard 5-lead TSOT-23 package with identical pinout (VIN, GND, SHDN, VFB/VOUT, LX) as other MCP1603/L variants in the same package. However, it is not pin-compatible with the 8-lead DFN variant (MCP1603-330I/MC) due to different pin count and layout. Always verify package code (/OS = TSOT-23) before board reuse.
MCP1603LT-330I/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):
- 3.3V
- 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
MCP1603LT-330I/OS FAQ
1.How can I place an order for MCP1603LT-330I/OS through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1603LT-330I/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 MCP1603LT-330I/OS reliable?
The price and inventory of MCP1603LT-330I/OS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1603LT-330I/OS is usually 5 days.
3.What payment methods are accepted for MCP1603LT-330I/OS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1603LT-330I/OS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1603LT-330I/OS?
MCP1603LT-330I/OS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1603LT-330I/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 MCP1603LT-330I/OS?
For technical support, including MCP1603LT-330I/OS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1603LT-330I/OS requirements.
6.How does Aetrix verify that MCP1603LT-330I/OS is sourced from the original manufacturer or authorized distributors?
All MCP1603LT-330I/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 MCP1603LT-330I/OS meets industry standards.
7.What is the process for return or replacement of MCP1603LT-330I/OS?
All MCP1603LT-330I/OS units undergo pre-shipment inspection (PSI). If there is an issue with MCP1603LT-330I/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 MCP1603LT-330I/OS part is unused and in its original packaging.
Return procedure for MCP1603LT-330I/OS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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