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Microchip Technology MCP1603LT-150I/OS
- Part No.:
- MCP1603LT-150I/OS
- Manufacturer:
- Microchip Technology
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MCP1603LT-150I/OS.pdf
- Description:
- IC REG BUCK 1.5V 500MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,330
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Product details
Overview
MCP1603LT-150I/OS from Microchip Technology is a fixed-output 1.5 V, 500 mA synchronous buck DC-DC 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-to-PWM mode transition, and integrated overtemperature and overcurrent protection. Used in USB-powered devices and digital cameras for compact, low-noise power conversion.
For engineers reviewing the MCP1603LT-150I/OS datasheet, MCP1603LT-150I/OS pinout, MCP1603LT-150I/OS application, or MCP1603LT-150I/OS equivalent, key selection criteria include its fixed 1.5 V output, 45 µA PFM quiescent current, TSOT-23-5 package with validated 5-pin pinout, thermal shutdown at 150°C, and compatibility with standard 4.7 µF input/output capacitors and 4.7 µH inductors.
Technical Context
The MCP1603LT-150I/OS implements a current-mode synchronous buck topology 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 quiescent current while maintaining tight output regulation.
Internal compensation, 0.8 V reference feedback, undervoltage lockout (2.28 V typical, 140 mV hysteresis), and cycle-by-cycle peak current limiting (860 mA typical) ensure robust start-up, fault recovery, and stable operation without external loop components. The device supports 100% duty cycle for low-dropout operation near VIN = VOUT.
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. |
| Max Output Current | 500 mA continuous; supports core logic rails in portable SoC applications. |
| Input Voltage Range | 2.7 V to 5.5 V; compatible with 1-cell Li-Ion (2.7–4.2 V) and 2/3-cell NiMH/NiCd (2.4–4.5 V). |
| Quiescent Current | 45 µA typical in PFM mode; extends battery runtime in standby/sleep states. |
| 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 = 3.6 V, VOUT = 1.5 V; reduces thermal load in space-constrained PCBs. |
| Thermal Shutdown | 150°C typical activation with 10°C hysteresis; protects against sustained overload or poor heatsinking. |
| UVLO Threshold | 2.28 V typical with 140 mV hysteresis; prevents erratic startup during battery sag or brownout. |
Pinout & Package
Package: 5-lead TSOT-23 (MCP1603L variant), 1.0 mm height, 2.9 mm × 1.6 mm footprint, exposed pad not present (TSOT-23 variant per DS22042B-page 13).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power supply input | Accepts 2.7–5.5 V; requires local 4.7 µF ceramic decoupling to GND. |
| GND | Ground reference | Low-impedance return path for power and control circuits; minimize loop area. |
| SHDN | Enable/disable control | Logic-high (>45% VIN) enables regulator; logic-low (<15% VIN) disables with 0.1 µA shutdown current. |
| VFB/VOUT | Feedback / output sense | Direct connection to regulated 1.5 V output; no external resistor divider needed. |
| LX | Switch node | Connects to buck inductor; carries high di/dt current; requires short, low-inductance trace. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic PFM/PWM mode transition | Eliminates manual mode control; maintains >85% efficiency from 0.1 mA to 500 mA load without external circuitry. |
| Internally compensated control loop | Reduces BOM count and layout complexity; no external compensation network required for stable operation. |
| 100% duty cycle capability | Enables regulation down to VIN – VOUT ≈ 0 V; critical for low-headroom battery discharge scenarios. |
| Integrated overcurrent protection | 860 mA cycle-by-cycle peak current limit prevents MOSFET damage during short-circuit or overload events. |
| Low-profile TSOT-23-5 packaging | 0.95 mm max height and 2.9 mm × 1.6 mm footprint enable ultra-thin portable designs. |
Applications
| Portable Digital Cameras | USB-Powered Peripherals |
|---|---|
Use Scenario: Powering image sensor, ISP, and memory interfaces in compact camera modules with single Li-Ion cell. IC Role / Device Role / Timing Role: Primary 1.5 V system rail regulator delivering clean, low-noise power with fast transient response. Use Value: 45 µA PFM quiescent current extends standby time; 2.0 MHz switching minimizes EMI near sensitive analog imaging circuits. | Use Scenario: Converting 5 V USB power to 1.5 V for low-power microcontrollers and sensors in dongles or adapters. IC Role / Device Role / Timing Role: Efficient step-down converter enabling direct USB bus powering without intermediate 3.3 V stage. Use Value: >90% efficiency at 500 mA reduces heat generation in sealed plastic enclosures; fixed 1.5 V output simplifies compliance with logic-level requirements. |
| Handheld Organizers / PDAs | Bluetooth Headsets |
Use Scenario: Supplying 1.5 V to RF transceivers and baseband processors in legacy PDA platforms using 2–3 NiMH cells. IC Role / Device Role / Timing Role: High-efficiency buck regulator supporting dynamic voltage scaling during CPU sleep/wake cycles. Use Value: Automatic PFM/PWM transition ensures minimal battery drain during idle periods while maintaining fast wake-up response. | Use Scenario: Generating 1.5 V for Bluetooth audio codec and DSP in battery-operated headsets powered by 3.7 V Li-Poly cells. IC Role / Device Role / Timing Role: Compact, low-noise power source meeting stringent acoustic noise and size constraints. Use Value: TSOT-23-5 footprint fits within tight mechanical envelopes; 100% duty cycle supports full battery discharge down to 1.5 V. |
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 1.5 V output, 600 mA rating, 3.6 MHz switching, 17 µA quiescent current; DSBGA-6 package. | Higher switching frequency enables smaller passives but increases EMI sensitivity; lower IQ benefits ultra-low-power sleep modes. | Select when board space is extremely constrained and higher-frequency filtering is acceptable; verify thermal performance at 500 mA in DSBGA. |
| RT8059GJ6 | Fixed 1.5 V output, 500 mA rating, 1.5 MHz switching, 25 µA quiescent current; SOT-23-6 package with EN and PG pins. | Includes power-good indicator and separate enable pin; lacks PFM/PWM auto-transition-operates PWM-only with minimum load requirement. | Select when system-level power sequencing or fault reporting is required; avoid if true zero-load regulation is needed. |
Compared with TPS62231DRYR and RT8059GJ6, the MCP1603LT-150I/OS provides superior light-load efficiency via PFM mode and simpler layout due to internal compensation, making it optimal for cost-sensitive, battery-life-critical portable designs where moderate switching noise is acceptable.
Availability
MCP1603LT-150I/OS is available at Aetrix Electronics and suitable for portable digital cameras, USB-powered peripherals, and Bluetooth headsets requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for MCP1603LT-150I/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, mixed-signal, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with high-reliability silicon and development tools.
The MCP1603/B/L product line delivers highly integrated, low-quiescent-current synchronous buck regulators targeting space- and battery-life-constrained portable electronics, emphasizing minimal external components and robust protection features.
FAQ
What is the output voltage tolerance of the MCP1603LT-150I/OS over temperature?
The MCP1603LT-150I/OS has a fixed 1.5 V output with ±2.5% tolerance over the operating junction temperature range of –40°C to +85°C, as specified in the DC Characteristics table of DS22042B. This tolerance includes effects of reference voltage drift, feedback amplifier error, and package thermal coefficients. The MCP1603LT-150I/OS achieves this stability without external trimming components due to factory-trimmed internal reference and feedback network.
Does the MCP1603LT-150I/OS require external compensation components?
No, the MCP1603LT-150I/OS is internally compensated and does not require external RC networks for loop stability. Its control architecture integrates all necessary compensation elements, enabling reliable operation with only three external passive components: input capacitor, output capacitor, and inductor. This simplifies design validation and reduces PCB area versus externally compensated alternatives. The MCP1603LT-150I/OS maintains phase margin >45° across input voltage, load, and temperature ranges per characterization data.
What is the minimum load requirement for regulation on the MCP1603LT-150I/OS?
The MCP1603LT-150I/OS-being an MCP1603/L variant-does not require a minimum load for regulation, unlike the PWM-only MCP1603B. It automatically transitions to PFM mode below ~10 mA, maintaining output regulation down to zero load with 45 µA quiescent current. This behavior is confirmed in Figure 2-6 and Section 4.2.1.1 of DS22042B. The MCP1603LT-150I/OS sustains 1.5 V ±2.5% accuracy even at IOUT = 0 mA.
Can the MCP1603LT-150I/OS operate with a 2.5 V input voltage?
Yes, the MCP1603LT-150I/OS supports input voltages as low as 2.7 V per absolute specifications, so 2.5 V is below its operational minimum and will trigger undervoltage lockout (UVLO). The typical UVLO turn-on threshold is 2.28 V with 140 mV hysteresis, meaning the device remains disabled until VIN rises above ~2.42 V and stays above 2.28 V thereafter. At 2.5 V input, the MCP1603LT-150I/OS will not start or sustain regulation. Valid operation requires VIN ≥ 2.7 V.
What thermal pad configuration is used in the MCP1603LT-150I/OS package?
The MCP1603LT-150I/OS uses the TSOT-23-5 package (MCP1603L variant), which does not include an exposed thermal pad. Unlike the 8-lead 2×3 DFN variant (MCP1603), the TSOT-23-5 relies on lead-frame conduction and PCB copper for thermal dissipation. Its θJA is 207.4°C/W on a typical 4-layer board with internal ground plane, as documented in DS22042B-page 6. No solder paste or vias are required for thermal pad attachment because no exposed pad exists in the MCP1603LT-150I/OS package.
MCP1603LT-150I/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):
- 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:
- TSOT-23-5
MCP1603LT-150I/OS FAQ
1.How can I place an order for MCP1603LT-150I/OS through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1603LT-150I/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-150I/OS reliable?
The price and inventory of MCP1603LT-150I/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-150I/OS is usually 5 days.
3.What payment methods are accepted for MCP1603LT-150I/OS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1603LT-150I/OS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1603LT-150I/OS?
MCP1603LT-150I/OS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1603LT-150I/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-150I/OS?
For technical support, including MCP1603LT-150I/OS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1603LT-150I/OS requirements.
6.How does Aetrix verify that MCP1603LT-150I/OS is sourced from the original manufacturer or authorized distributors?
All MCP1603LT-150I/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-150I/OS meets industry standards.
7.What is the process for return or replacement of MCP1603LT-150I/OS?
All MCP1603LT-150I/OS units undergo pre-shipment inspection (PSI). If there is an issue with MCP1603LT-150I/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-150I/OS part is unused and in its original packaging.
Return procedure for MCP1603LT-150I/OS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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