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Microchip Technology MCP1603LT-250I/OS
- Part No.:
- MCP1603LT-250I/OS
- Manufacturer:
- Microchip Technology
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MCP1603LT-250I/OS.pdf
- Description:
- IC REG BUCK 2.5V 500MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MCP1603LT-250I/OS from Microchip Technology is a fixed-output 2.5 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, automatic PFM/PWM mode transition, and integrated overtemperature and overcurrent protection. Used in USB-powered devices and digital cameras for compact, low-noise local regulation.
For engineers reviewing the MCP1603LT-250I/OS datasheet, MCP1603LT-250I/OS pinout, MCP1603LT-250I/OS application, or MCP1603LT-250I/OS equivalent, this page provides verified technical context, exact pin functions, real-world design meaning of key specs, validated alternative options, and supply-ready availability details - all specific to the MCP1603LT-250I/OS variant with 2.5 V fixed output in TSOT-23 package.
Technical Context
The MCP1603LT-250I/OS implements a current-mode synchronous buck architecture with integrated P-channel high-side and N-channel low-side MOSFETs (RDS(on) = 500 mΩ each), enabling 100% duty cycle operation and eliminating external diode losses. Its 2.0 MHz fixed-frequency PWM mode ensures low output ripple (<15 mV) and small external component size, while automatic transition to PFM mode at light loads reduces quiescent current to 45 µA.
It incorporates undervoltage lockout (UVLO = 2.28 V typ., 140 mV hysteresis), thermal shutdown (150°C trip, 10°C hysteresis), and cycle-by-cycle peak current limiting (860 mA). The device uses an internal 0.8 V reference and requires no external compensation when configured for fixed 2.5 V output - only three passive components (CIN, COUT, L) are needed for full functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5 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 SoCs and microcontrollers without derating at ambient ≤85°C. |
| 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 typical - enables use of 4.7 µH inductors and 4.7 µF ceramic capacitors, minimizing solution footprint. |
| Quiescent Current | 45 µA typical in PFM mode - extends battery runtime in standby states of handheld devices. |
| Shutdown Current | 0.1 µA typical - ensures negligible drain during system sleep or power-off modes. |
| Efficiency | >90% typical at 500 mA, VIN = 3.6 V, VOUT = 2.5 V - reduces thermal load and improves energy utilization in space-constrained designs. |
Pinout & Package
Package: 5-lead TSOT-23 (MCP1603L variant), 0.95 mm profile, exposed pad not present - suitable for ultra-thin portable PCBs with minimal board area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Power supply input | Accepts 2.7–5.5 V; requires 4.7 µF low-ESR ceramic decoupling capacitor placed adjacent to pin to suppress high-frequency switching noise. |
| 2 (GND) | Ground reference | Primary return path for power and control circuits; must be connected to solid ground plane with short trace to minimize EMI and voltage bounce. |
| 3 (SHDN) | Enable/disable control | Logic-high (>45% VIN) enables regulation; logic-low (<15% VIN) disables output and reduces current draw to 0.1 µA. |
| 4 (VFB/VOUT) | Feedback / output sense | Connected directly to regulated 2.5 V output; internal 0.8 V reference and precision resistor network set fixed output - no external divider required. |
| 5 (LX) | Switch node | Drives buck inductor; carries high di/dt current pulses - must be routed with shortest possible trace to minimize parasitic inductance and EMI radiation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous MOSFETs | Eliminates external diode and reduces conduction loss - enables >90% efficiency across 10 mA–500 mA load range. |
| Automatic PFM/PWM mode transition | Maintains high efficiency at light loads (45 µA IQ) and low ripple at heavy loads (2.0 MHz PWM) without external control logic. |
| Internally compensated fixed-output version | Reduces BOM count to just CIN, COUT, and L - accelerates design-in and improves reliability by removing tuning variables. |
| Undervoltage lockout with hysteresis | Prevents erratic startup below 2.28 V and avoids oscillation near threshold due to 140 mV hysteresis - critical for battery voltage sag conditions. |
| Thermal and overcurrent protection | Shuts down at 150°C junction temperature and limits peak switch current to 860 mA - protects IC and system under fault conditions. |
Applications
| Portable Digital Cameras | USB-Powered Peripherals |
|---|---|
Use Scenario: Powering image sensor, ISP, and memory interface from USB 5 V or Li-Ion battery. IC Role / Device Role / Timing Role: Primary 2.5 V rail regulator delivering clean, low-noise power with fast transient response to handle burst capture loads. Use Value: Enables compact camera modules with <10 mm height via TSOT-23 package and 4.7 µH/4.7 µF passive set - meets EMC requirements without added filtering. |
Use Scenario: Regulating 5 V USB source to stable 2.5 V for MCU, USB transceiver, and I/O buffers. IC Role / Device Role / Timing Role: Local point-of-load converter ensuring voltage compliance during USB suspend/resume transitions. Use Value: 0.1 µA shutdown current prevents battery drain in unpowered USB hubs or dongles; 2.0 MHz switching avoids interference with USB 2.0 signaling. |
| Handheld Medical Monitors | Industrial Handheld Scanners |
Use Scenario: Supplying analog front-end (AFE), ADC, and display controller from primary Li-Ion cell. IC Role / Device Role / Timing Role: High-PSRR, low-noise 2.5 V source for precision analog circuitry requiring stable reference voltage. Use Value: PFM mode extends battery life between calibrations; UVLO prevents erroneous readings during low-battery brownout conditions. |
Use Scenario: Powering barcode scanner engine, RF module, and touch interface in ruggedized field equipment. IC Role / Device Role / Timing Role: Robust DC-DC stage tolerant of wide input variation (2.7–5.5 V) and mechanical shock-induced voltage transients. Use Value: Integrated thermal shutdown and 860 mA current limit protect against inductive kickback from motor-driven scan mechanisms. |
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 | 2.5 V fixed, 500 mA, 3.6 MHz switching, 17 µA IQ in PFM - higher frequency enables smaller passives but increases EMI risk. | Requires tighter layout control for EMI; better suited for space-critical designs where 3.6 MHz filtering is manageable. | Select TPS62231DRYR if board area is constrained and EMI filtering can be implemented; verify thermal performance at 500 mA in DRY package. |
| RT8059ZSP | 2.5 V fixed, 600 mA, 1.5 MHz switching, 25 µA IQ - lower frequency eases EMI compliance but needs larger inductor (6.8 µH typical). | Better low-frequency noise immunity; preferred for mixed-signal systems sensitive to 2 MHz harmonics. | Choose RT8059ZSP when system-level EMI testing shows sensitivity near 2 MHz; confirm 600 mA capability matches peak load margin. |
Compared with MCP1603LT-250I/OS, TPS62231DRYR offers higher switching frequency and lower quiescent current but demands stricter layout and filtering, while RT8059ZSP trades frequency for improved noise margin and higher current headroom - both require revalidation of loop stability and thermal performance in the target application.
Availability
MCP1603LT-250I/OS is available at Aetrix Electronics and suitable for portable medical monitors, industrial handheld scanners, USB-powered peripherals, and digital camera modules requiring stable component supply with guaranteed long-term sourcing.
Supply support for MCP1603LT-250I/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 is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and power management ICs, with a focus on robust, low-power solutions for embedded and portable applications.
The MCP1603 family was designed specifically for space-constrained, battery-operated consumer and industrial devices requiring high-efficiency, low-quiescent-current DC-DC conversion with minimal external components.
FAQ
What is the output voltage tolerance of the MCP1603LT-250I/OS over temperature?
The MCP1603LT-250I/OS maintains a fixed 2.5 V output with ±2.5% tolerance over the full operating temperature range of –40°C to +85°C. This specification is guaranteed by internal trimming of the feedback reference and resistor network, and applies under nominal load (100–500 mA) and input voltage (2.7–5.5 V). The tighter tolerance versus wider-range alternatives ensures reliable operation of 2.5 V I/O interfaces and ADC references.
Does the MCP1603LT-250I/OS require external compensation components?
No, the MCP1603LT-250I/OS does not require external compensation components when used in its fixed 2.5 V configuration. The device integrates internal compensation optimized for standard 4.7 µH inductors and 4.7 µF ceramic capacitors. External compensation is only necessary for adjustable-output variants; the MCP1603LT-250I/OS achieves stable regulation with just three external passives: input capacitor, output capacitor, and inductor.
What is the minimum load requirement for regulation on the MCP1603LT-250I/OS?
The MCP1603LT-250I/OS has no minimum load requirement for regulation because it supports automatic PFM/PWM mode transition - unlike the PWM-only MCP1603B variant. It maintains tight 2.5 V regulation from 0 mA up to 500 mA, making it suitable for systems with deep-sleep states where load current drops to microamps without compromising output accuracy.
How does the SHDN pin interface with common microcontroller GPIOs?
The SHDN pin of the MCP1603LT-250I/OS accepts standard CMOS logic levels: a voltage >45% of VIN enables regulation, and <15% of VIN disables it. When driven by a 3.3 V GPIO, it reliably enables the device across the full 2.7–5.5 V input range. Internal input leakage is ±0.1 µA, so no series resistor is needed - direct connection to MCU GPIO suffices for controlled power sequencing.
Is the MCP1603LT-250I/OS RoHS-compliant and halogen-free?
Yes, the MCP1603LT-250I/OS is RoHS-compliant and halogen-free per Microchip's standard product specifications. The TSOT-23 package uses lead-free matte tin plating and meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL1) - suitable for standard reflow profiles without baking. Full compliance documentation is available in Microchip's part-specific environmental reports.
MCP1603LT-250I/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):
- 2.5V
- 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:
- TSOT-23-5
MCP1603LT-250I/OS FAQ
1.How can I place an order for MCP1603LT-250I/OS through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1603LT-250I/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-250I/OS reliable?
The price and inventory of MCP1603LT-250I/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-250I/OS is usually 5 days.
3.What payment methods are accepted for MCP1603LT-250I/OS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1603LT-250I/OS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1603LT-250I/OS?
MCP1603LT-250I/OS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1603LT-250I/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-250I/OS?
For technical support, including MCP1603LT-250I/OS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1603LT-250I/OS requirements.
6.How does Aetrix verify that MCP1603LT-250I/OS is sourced from the original manufacturer or authorized distributors?
All MCP1603LT-250I/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-250I/OS meets industry standards.
7.What is the process for return or replacement of MCP1603LT-250I/OS?
All MCP1603LT-250I/OS units undergo pre-shipment inspection (PSI). If there is an issue with MCP1603LT-250I/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-250I/OS part is unused and in its original packaging.
Return procedure for MCP1603LT-250I/OS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MCP1603LT-250I/OS Tags
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