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Microchip Technology MCP1603T-ADJI/OS
- Part No.:
- MCP1603T-ADJI/OS
- Manufacturer:
- Microchip Technology
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MCP1603T-ADJI/OS.pdf
- Description:
- IC REG BUCK ADJ 500MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MCP1603T-ADJI/OS from Microchip Technology is a 2.0 MHz, 500 mA synchronous buck regulator with adjustable output voltage (0.8V–4.5V), 90% typical efficiency, 45 µA PFM quiescent current, and integrated P-channel/N-channel MOSFETs. It operates from 2.7V–5.5V input-ideal for single-cell Li-Ion or dual/triple NiMH/NiCd battery-powered portable electronics requiring compact, high-efficiency DC-DC conversion.
For engineers reviewing the MCP1603T-ADJI/OS datasheet, MCP1603T-ADJI/OS pinout, MCP1603T-ADJI/OS application, or MCP1603T-ADJI/OS equivalent, key selection considerations include its automatic PWM-to-PFM mode transition, internal compensation, 0.8V feedback reference, UVLO (2.28V typ), and thermal shutdown (150°C).
Technical Context
The MCP1603T-ADJI/OS implements current-mode control in fixed-frequency 2.0 MHz PWM mode under heavy load and transitions automatically to pulse-frequency modulation (PFM) at light loads to minimize quiescent current. Its integrated synchronous rectification eliminates external diode losses.
It features an internally compensated error amplifier referenced to 0.8V, cycle-by-cycle overcurrent protection (860 mA peak), undervoltage lockout with 140 mV hysteresis, and thermal shutdown with 10°C hysteresis-enabling robust operation in space-constrained, battery-sensitive systems without external loop compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports direct connection to single Li-Ion (3.0–4.2V) or 2–3 cell NiMH/NiCd packs. |
| Output Current | 500 mA continuous - sufficient for powering core logic, RF modules, or sensors in portable devices. |
| Switching Frequency | 2.0 MHz (typ) - enables use of small 4.7 µH inductors and 4.7 µF ceramic capacitors for minimal PCB footprint. |
| Feedback Reference | 0.8V ±2.5% - sets output via external resistor divider; allows precise 0.8V–4.5V adjustment with <±3% total output tolerance. |
| Quiescent Current | 45 µA (PFM mode, typ) - extends battery life in standby or low-power listening states (e.g., Bluetooth LE peripherals). |
| Efficiency | 90% (typ, VIN=3.6V, VOUT=1.8V, IOUT=300mA) - reduces thermal load and improves runtime in thermally constrained enclosures. |
| Protection Features | UVLO (2.28V), thermal shutdown (150°C), cycle-by-cycle current limit (860 mA) - ensures safe operation during brownout, overload, or ambient temperature extremes. |
Pinout & Package
Package: 5-Lead TSOT-23 (MCP1603/MCP1603B variant). Exposed pad not present; standard plastic package with 0.65 mm pitch.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VIN | Input power supply (2.7–5.5V); requires local 4.7 µF ceramic decoupling to GND. |
| 2 | GND | Analog/digital ground reference; must be connected to low-impedance PCB ground plane. |
| 3 | SHDN | Active-high enable control; logic high >45% VIN enables regulation; logic low <15% VIN disables output and reduces current to 0.1 µA. |
| 4 | VFB/VOUT | Feedback node for adjustable output; connects to center of resistor divider (or directly to VOUT for fixed versions); referenced to 0.8V internal bandgap. |
| 5 | LX | Switch node connecting to buck inductor; carries high di/dt current; requires short, low-inductance trace to minimize EMI and voltage spikes. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic PWM-to-PFM mode transition | Eliminates need for external mode control logic; maintains >85% efficiency down to 100 µA load while reducing audible noise and ripple in sleep modes. |
| Internally compensated error amplifier | Removes requirement for external compensation network-reduces BOM count and layout complexity in cost-sensitive designs. |
| 100% duty cycle capability | Enables regulation even when VIN approaches VOUT, extending usable battery voltage range and improving end-of-discharge runtime. |
| Synchronous rectification | Integrates both P- and N-channel MOSFETs (RDS(on) = 500 mΩ each); eliminates external Schottky loss and improves light-load efficiency vs. asynchronous alternatives. |
| Low shutdown current | 0.1 µA typical - preserves battery charge during long-term storage or system hibernation without external load switches. |
Applications
| Portable Medical Sensors | USB-Powered IoT Nodes |
|---|---|
Use Scenario: Wearable glucose monitor powered by coin-cell or single Li-Poly battery, operating intermittently with 10-second sensor activation cycles. IC Role / Device Role / Timing Role: Primary step-down regulator delivering stable 1.8V to ultra-low-power MCU and analog front-end; manages dynamic load transitions between sleep (10 µA) and active (200 mA) states. Use Value: 45 µA PFM quiescent current extends battery life beyond 6 months; 2.0 MHz switching avoids interference with 2.4 GHz BLE radio operation. | Use Scenario: Battery-backed environmental sensor node drawing power from USB host during configuration, then switching to internal Li-Ion during field deployment. IC Role / Device Role / Timing Role: Input-voltage-agnostic buck converter maintaining 3.3V rail across 4.5–5.5V (USB) and 3.0–4.2V (battery) sources with seamless switchover behavior. Use Value: 2.7–5.5V input range and 100% duty cycle support eliminate need for auxiliary LDO or OR-ing circuitry; reduces component count by two ICs. |
| Digital Camera Image Sensors | Headset Audio Amplifiers |
Use Scenario: Compact action camera requiring clean, low-noise 1.2V supply for CMOS image sensor with fast wake-up from standby. IC Role / Device Role / Timing Role: High-efficiency, low-ripple power source for image sensor digital core; soft-start limits inrush during frame capture initiation. Use Value: 2.0 MHz PWM mode delivers <15 mVpp output ripple-prevents clock jitter in sensor timing circuits and avoids visible banding artifacts in video output. | Use Scenario: Bluetooth headset with ANC requiring tightly regulated 1.5V for DSP and 3.3V for RF transceiver, both derived from single 3.7V Li-Ion cell. IC Role / Device Role / Timing Role: Dual-rail generation via two MCP1603T-ADJI/OS units-one configured for 1.5V, one for 3.3V-enabling independent enable/disable control per subsystem. Use Value: Adjustable output architecture allows exact voltage matching to ASIC requirements; eliminates tolerance stacking from cascaded regulators. |
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 1.8V output only; 3.0–5.5V input; 400 mA max; 3.6 MHz switching; no PFM mode. | Not suitable for adjustable-output designs; higher frequency increases EMI filtering burden but allows smaller passives. | Select when fixed 1.8V output and smallest possible solution size are prioritized over flexibility and ultra-low IQ. |
| RT8059GJ6 | Adjustable 0.6–5.0V output; 2.5–5.5V input; 600 mA; 1.5 MHz; 25 µA IQ in PFM; no internal compensation. | Requires external compensation network; lower IQ benefits longer standby but adds design complexity. | Choose when sub-25 µA quiescent current is critical and board area permits added compensation components. |
Compared with TPS62231DRYR and RT8059GJ6, the MCP1603T-ADJI/OS offers the optimal balance of adjustability, integrated compensation, and proven 45 µA PFM IQ-making it preferred for rapid prototyping and production of battery-powered portable devices where BOM simplicity and runtime predictability are essential.
Availability
MCP1603T-ADJI/OS is available at Aetrix Electronics and suitable for portable medical sensors, USB-powered IoT nodes, digital camera image sensors, and headset audio amplifiers requiring stable component supply across extended production lifecycles.
Supply support for MCP1603T-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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and power management ICs for embedded control applications.
The MCP1603/B/L product line was designed specifically for high-efficiency, space-constrained DC-DC conversion in portable battery-powered equipment-emphasizing low quiescent current, integrated MOSFETs, and simplified external component requirements.
FAQ
What is the minimum input voltage required for regulation with MCP1603T-ADJI/OS?
The MCP1603T-ADJI/OS requires input voltage greater than the output voltage plus headroom-typically ≥0.3V above VOUT at full load. With 0.8V feedback reference and RDS(on) losses, practical minimum VIN is ~1.1V for 0.8V output, but datasheet specifies absolute minimum of 2.7V for guaranteed operation across temperature and process variation. For 1.8V output, VIN must exceed ~2.1V to sustain 500 mA.
Does MCP1603T-ADJI/OS require external compensation components?
No. The MCP1603T-ADJI/OS is internally compensated-no external RC network is needed for stability with standard 4.7 µH inductor and 4.7 µF ceramic capacitors. This simplifies layout and reduces BOM count versus controllers requiring external compensation, such as RT8059GJ6.
How does the SHDN pin interface with common microcontroller GPIOs?
The SHDN pin accepts standard CMOS logic levels: VIH >45% VIN (e.g., >1.2V when VIN=2.7V) enables regulation; VIL <15% VIN (e.g., <0.4V) disables it. A 3.3V GPIO can directly drive SHDN when VIN ≥3.3V; for lower VIN, a level-shifting buffer or resistive divider may be needed to ensure valid thresholds.
What is the thermal performance of MCP1603T-ADJI/OS in the TSOT-23 package?
In the 5-lead TSOT-23 package, MCP1603T-ADJI/OS has θJA = 207.4°C/W on a typical 4-layer board with internal ground plane. At 500 mA output into 1.8V with 3.6V input (≈0.9W dissipation), junction rise is ~187°C-exceeding 125°C rating. Derating to ≤300 mA or adding copper pour is recommended for continuous full-load operation.
Can MCP1603T-ADJI/OS be used to generate 5V output from a 12V input?
No. MCP1603T-ADJI/OS has maximum input voltage of 5.5V and is designed for step-down only. Attempting 12V input exceeds absolute maximum ratings and will cause permanent damage. For 12V-to-5V conversion, a wide-input buck controller like MIC28512 or discrete buck solution is required.
MCP1603T-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
MCP1603T-ADJI/OS FAQ
1.How can I place an order for MCP1603T-ADJI/OS through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1603T-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 MCP1603T-ADJI/OS reliable?
The price and inventory of MCP1603T-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 MCP1603T-ADJI/OS is usually 5 days.
3.What payment methods are accepted for MCP1603T-ADJI/OS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1603T-ADJI/OS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1603T-ADJI/OS?
MCP1603T-ADJI/OS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1603T-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 MCP1603T-ADJI/OS?
For technical support, including MCP1603T-ADJI/OS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1603T-ADJI/OS requirements.
6.How does Aetrix verify that MCP1603T-ADJI/OS is sourced from the original manufacturer or authorized distributors?
All MCP1603T-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 MCP1603T-ADJI/OS meets industry standards.
7.What is the process for return or replacement of MCP1603T-ADJI/OS?
All MCP1603T-ADJI/OS units undergo pre-shipment inspection (PSI). If there is an issue with MCP1603T-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 MCP1603T-ADJI/OS part is unused and in its original packaging.
Return procedure for MCP1603T-ADJI/OS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MCP1603T-ADJI/OS Tags
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