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Microchip Technology MCP1603LT-ADJI/OS
- Part No.:
- MCP1603LT-ADJI/OS
- Manufacturer:
- Microchip Technology
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MCP1603LT-ADJI/OS.pdf
- Description:
- IC REG BUCK ADJ 500MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,119
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Product details
Overview
MCP1603LT-ADJI/OS 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 adjustable output voltage from 0.8 V to 4.5 V with typical 90% efficiency, 2.0 MHz fixed-frequency PWM operation under heavy load, and automatic PFM mode transition at light load to achieve 45 µA quiescent current. It integrates P- and N-channel MOSFETs, internal compensation, UVLO, overtemperature shutdown, and cycle-by-cycle overcurrent protection.
For engineers reviewing the MCP1603LT-ADJI/OS datasheet, MCP1603LT-ADJI/OS pinout, MCP1603LT-ADJI/OS application, or MCP1603LT-ADJI/OS equivalent, key selection considerations include its adjustable-output capability, TSOT-23-5 package with verified 5-pin mapping, PFM/PWM hybrid control architecture, thermal performance in portable battery systems, and compatibility with low-ESR ceramic input/output capacitors and 4.7 µH inductors.
Technical Context
The MCP1603LT-ADJI/OS implements current-mode control with an internal 0.8 V reference and dual-mode switching: fixed 2.0 MHz PWM at high load (IOUT ≥ ~100 mA), transitioning automatically to discontinuous-conduction PFM mode below that threshold to minimize quiescent draw. Its integrated synchronous rectification eliminates external diode losses, while internal slope compensation ensures stability across duty cycles.
Control logic includes soft-start (0.6 ms typical startup time), undervoltage lockout with 2.28 V nominal threshold and 140 mV hysteresis, thermal shutdown at 150 °C with 10 °C hysteresis, and peak-current limiting at 860 mA. The device operates across –40 °C to +125 °C junction temperature and supports 100% duty cycle for low-dropout operation near VIN = VOUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 500 mA continuous - supports full-power operation of microcontrollers, RF modules, and sensors in space-constrained portable designs. |
| Input Voltage Range | 2.7 V to 5.5 V - directly compatible with 1-cell Li-Ion, 2–3-cell NiMH/NiCd, and USB 5 V rails without pre-regulation. |
| Adjustable Output Range | 0.8 V to 4.5 V - enables precise core voltage scaling for low-voltage ASICs, FPGAs, and memory interfaces. |
| Quiescent Current (PFM) | 45 µA typical - extends battery life in always-on or sleep-mode applications such as wearables and IoT endpoints. |
| Switching Frequency | 2.0 MHz typical (PWM mode) - permits use of compact 4.7 µH inductors and 4.7 µF ceramic capacitors, minimizing PCB footprint. |
| Feedback Reference Voltage | 0.8 V ±2.5% (–40 °C to +85 °C) - defines output accuracy for adjustable configurations and sets minimum resolvable VOUT. |
| Thermal Shutdown Threshold | 150 °C typical - protects against sustained overload or poor heatsinking in sealed enclosures or high-ambient environments. |
Pinout & Package
The MCP1603LT-ADJI/OS is housed in a 5-lead TSOT-23 package with exposed pad (EP) thermally connected to GND. Pin 1 is VIN; Pin 2 is GND; Pin 3 is SHDN; Pin 4 is VFB/VOUT; Pin 5 is LX. The EP must be soldered to a GND plane via thermal vias for reliable thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power supply input | Accepts 2.7–5.5 V; requires local 4.7 µF low-ESR ceramic decoupling to GND to suppress switching noise. |
| GND | Ground reference | Primary return path for power and control circuits; must be routed with minimal loop area to reduce EMI. |
| SHDN | Enable/disable control | Logic-high (>45% VIN) enables regulation; logic-low (<15% VIN) disables output and reduces supply current to 0.1 µA. |
| VFB/VOUT | Feedback node | Connects to resistor divider midpoint for adjustable outputs or directly to VOUT for fixed versions; senses 0.8 V reference for regulation. |
| LX | Switch node | Drives buck inductor; carries high di/dt current-requires shortest possible trace to minimize ringing and EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated control loop | Eliminates need for external compensation network-reduces BOM count and layout sensitivity in cost-sensitive designs. |
| Automatic PWM-to-PFM mode transition | Enables seamless efficiency optimization across full 0–500 mA load range without firmware intervention or external mode control. |
| 100% duty cycle operation | Supports dropout operation down to VIN – VOUT ≈ 0 V-critical for maintaining regulation during battery voltage sag in portable equipment. |
| Integrated P- and N-channel MOSFETs | Reduces solution size and improves efficiency vs. external-FET buck controllers; RDS(on) ≤ 500 mΩ per switch at 100 mA. |
| Overtemperature and overcurrent protection | Provides fault resilience in unattended or thermally constrained deployments-thermal shutdown resets automatically after 10 °C cooldown. |
Applications
| Portable Medical Sensors | USB-Powered Test Equipment |
|---|---|
Use Scenario: Continuous glucose monitor with Bluetooth LE radio operating from a 3.7 V Li-Ion cell. IC Role / Device Role / Timing Role: Primary step-down regulator supplying 1.8 V to MCU and 3.3 V to BLE transceiver via dual-output configuration. Use Value: 45 µA PFM quiescent current extends battery life beyond 7 days in standby; 2.0 MHz switching avoids interference with 2.4 GHz ISM band. | Use Scenario: Handheld oscilloscope powered solely from USB 5 V bus. IC Role / Device Role / Timing Role: Efficient conversion of 5 V USB input to stable 3.3 V for analog front-end and FPGA logic. Use Value: 90% typical efficiency minimizes self-heating in plastic enclosure; TSOT-23-5 footprint enables compact 2-layer PCB layout. |
| Industrial Handheld Terminals | Low-Power IoT Edge Nodes |
Use Scenario: Rugged barcode scanner using 2-cell NiMH battery (2.4–3.6 V). IC Role / Device Role / Timing Role: Adjustable 1.2 V core supply for ARM Cortex-M4 processor with dynamic voltage scaling. Use Value: 0.8 V feedback reference enables accurate low-VOUT setting; UVLO hysteresis prevents brownout oscillation during battery discharge. | Use Scenario: Battery-operated environmental sensor node transmitting data every 5 minutes via LoRaWAN. IC Role / Device Role / Timing Role: Main power rail generator for ultra-low-power MCU, sensor interface, and RF transceiver. Use Value: Automatic PFM mode reduces average supply current to <100 µA during 99% sleep time-enabling >2-year coin-cell operation. |
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 output only; 3–6 V input; 300 mA max output; 3.6 MHz switching frequency. | Not adjustable; lower current rating; higher fSW demands smaller L/C but increases switching loss at high IOUT. | Select when fixed 1.8 V and ultra-small solution size outweigh need for flexibility or 500 mA capability. |
| RT8059GJ6 | Adjustable 0.6–5.5 V output; 2.5–5.5 V input; 600 mA output; 1.5 MHz switching; external compensation required. | Higher current and wider VOUT range, but adds two compensation components and larger footprint than MCP1603LT-ADJI/OS. | Select when >500 mA or sub-0.8 V output is required, and board space allows for RC network. |
Compared with TPS62231DRYR and RT8059GJ6, the MCP1603LT-ADJI/OS uniquely balances adjustability, 500 mA capability, internal compensation, and ultra-low PFM quiescent current in a 5-pin TSOT-making it optimal for battery-life-critical, space-constrained designs where output voltage may vary across product variants.
Availability
MCP1603LT-ADJI/OS is available at Aetrix Electronics and suitable for portable medical sensors, USB-powered test equipment, and industrial handheld terminals requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for MCP1603LT-ADJI/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 leading provider of microcontrollers, analog devices, and power management ICs, with deep expertise in low-power embedded systems and battery-operated applications.
The MCP1603/B/L family was designed specifically for high-efficiency, small-footprint DC-DC conversion in portable electronics-emphasizing adaptive PFM/PWM control, integrated power stages, and robust protection for unattended operation.
FAQ
What is the maximum output current supported by the MCP1603LT-ADJI/OS?
The MCP1603LT-ADJI/OS delivers up to 500 mA of continuous output current under typical conditions (TA = +25°C, VIN = 3.6 V, VOUT = 1.8 V). Actual achievable current depends on thermal design, input voltage, and ambient temperature-derating applies above 85°C ambient due to thermal shutdown at 150°C junction temperature. The device includes cycle-by-cycle overcurrent protection with 860 mA peak limit.
Does the MCP1603LT-ADJI/OS require external compensation components?
No, the MCP1603LT-ADJI/OS features an internally compensated control loop. This eliminates the need for external RC compensation networks typically required in adjustable buck controllers, reducing BOM count, PCB area, and design validation effort. The internal compensation is optimized for standard 4.7 µH inductors and 4.7 µF ceramic capacitors across the full 0.8–4.5 V output range.
How does the MCP1603LT-ADJI/OS manage efficiency across varying load conditions?
The MCP1603LT-ADJI/OS uses automatic mode transition: it operates in fixed 2.0 MHz PWM mode at heavy loads (≥100 mA) for low ripple and noise, then seamlessly shifts to PFM mode at light loads to reduce quiescent current to 45 µA typical. This dual-mode architecture maintains >85% efficiency from 1 mA to 500 mA, eliminating manual mode control or complex external circuitry.
What is the function of the SHDN pin on the MCP1603LT-ADJI/OS?
The SHDN pin on the MCP1603LT-ADJI/OS is a logic-level enable/disable input. Pulling SHDN high (>45% of VIN) activates regulation; pulling it low (<15% of VIN) places the device in shutdown mode with only 0.1 µA typical input current. Internal pull-down ensures safe default-off behavior if left floating. No external pull-up resistor is required for basic enable control.
Can the MCP1603LT-ADJI/OS operate with input voltage equal to output voltage?
Yes-the MCP1603LT-ADJI/OS supports 100% duty cycle operation, allowing it to maintain regulation even when VIN approaches VOUT. This is essential for battery-powered systems where input voltage sags near end-of-discharge (e.g., 3.0 V Li-Ion dropping to 2.8 V while powering a 2.5 V rail). The device sustains regulation until VIN falls below the UVLO threshold (2.28 V typical).
MCP1603LT-ADJI/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:
- 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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
MCP1603LT-ADJI/OS FAQ
1.How can I place an order for MCP1603LT-ADJI/OS through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1603LT-ADJI/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-ADJI/OS reliable?
The price and inventory of MCP1603LT-ADJI/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-ADJI/OS is usually 5 days.
3.What payment methods are accepted for MCP1603LT-ADJI/OS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1603LT-ADJI/OS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1603LT-ADJI/OS?
MCP1603LT-ADJI/OS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1603LT-ADJI/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-ADJI/OS?
For technical support, including MCP1603LT-ADJI/OS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1603LT-ADJI/OS requirements.
6.How does Aetrix verify that MCP1603LT-ADJI/OS is sourced from the original manufacturer or authorized distributors?
All MCP1603LT-ADJI/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-ADJI/OS meets industry standards.
7.What is the process for return or replacement of MCP1603LT-ADJI/OS?
All MCP1603LT-ADJI/OS units undergo pre-shipment inspection (PSI). If there is an issue with MCP1603LT-ADJI/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-ADJI/OS part is unused and in its original packaging.
Return procedure for MCP1603LT-ADJI/OS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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