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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Microchip Technology MCP1603T-150I/OS

Name: MCP1603T-150I/OS
Brand: Microchip Technology
SKU: MCP1603T-150I/OS
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MCP1603T-150I/OS

Manufacturer:: Microchip Technology

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: SOT-23-5 Thin, TSOT-23-5

Datasheet:: MCP1603T-150I/OS.pdf

Description:: IC REG BUCK 1.5V 500MA TSOT23-5

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Product details

Overview

MCP1603T-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 - deployed in USB-powered devices and digital cameras.

For engineers reviewing the MCP1603T-150I/OS datasheet, MCP1603T-150I/OS pinout, MCP1603T-150I/OS application, or MCP1603T-150I/OS equivalent, key selection criteria include its fixed 1.5 V output, 45 µA PFM quiescent current, 0.1 µA shutdown current, TSOT-23-5 package compatibility, and suitability for space-constrained, battery-life-sensitive designs requiring stable low-noise regulation.

Technical Context

The MCP1603T-150I/OS implements a current-mode synchronous buck topology with integrated P- and N-channel MOSFETs, enabling high-efficiency step-down conversion without external power switches. Its 2.0 MHz fixed-frequency PWM operation (heavy load) and automatic transition to pulse-frequency modulation (light load) minimize output ripple and quiescent current draw simultaneously.

It incorporates undervoltage lockout (UVLO) with 2.28 V nominal threshold and 140 mV hysteresis, thermal shutdown at 150 °C with 10 °C hysteresis, cycle-by-cycle peak current limiting at 860 mA, and internal compensation - eliminating need for external loop components in fixed-output configurations.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 1.5 V ±2.5% over –40°C to +85°C - ensures stable core voltage for low-power microcontrollers and sensors.
Max Output Current	500 mA continuous - supports moderate-power peripherals like camera modules and audio codecs.
Input Voltage Range	2.7 V to 5.5 V - compatible with 1-cell Li-Ion (2.7–4.2 V), 2- or 3-cell NiMH/NiCd (2.4–4.5 V), and USB 5 V rails.
Quiescent Current (PFM)	45 µA typical - extends battery runtime in standby/sleep modes of portable equipment.
Shutdown Current	0.1 µA typical - enables ultra-low-power system-level power gating.
Switching Frequency	2.0 MHz typical - allows use of small 4.7 µH inductors and 4.7 µF ceramic capacitors, minimizing PCB area.
Feedback Reference	0.8 V internal reference - defines output via resistor divider for adjustable variants; not used in fixed 1.5 V version.
Thermal Protection	150 °C junction shutdown with 10 °C hysteresis - prevents permanent damage during sustained overload or poor heatsinking.

Pinout & Package

Package: 5-Lead TSOT-23 (Thin Small Outline Transistor), lead pitch 0.65 mm, body size 2.9 mm × 1.6 mm × 1.1 mm, exposed pad not present - optimized for compact, low-profile portable PCB layouts.

Pin/Terminal	Circuit Role	Design Meaning
VIN	Power supply input	Accepts 2.7–5.5 V input; requires local 4.7 µF ceramic decoupling to GND to suppress switching noise.
GND	Ground reference	Primary return path for input/output currents; must be connected to low-impedance ground plane to minimize EMI and thermal resistance.
SHDN	Enable/disable control	Logic-high (>45% VIN) enables regulation; logic-low (<15% VIN) disables output and reduces current draw to 0.1 µA.
VFB/VOUT	Output voltage sense / feedback	Connected directly to regulated 1.5 V output; no external divider needed - simplifies layout and improves accuracy.
LX	Switch node	Drives buck inductor; carries high di/dt current - requires shortest possible trace to minimize parasitic inductance and EMI.

Key Features

Feature	Design Value
Integrated synchronous MOSFETs	Eliminates need for external high-side and low-side switches - reduces BOM count and layout complexity.
Automatic PFM/PWM mode transition	Maintains >90% efficiency across 0.1–500 mA load range without manual control or external circuitry.
Internally compensated	Enables stable regulation with only three external components (C_IN, C_OUT, L) - no compensation network required for fixed-output use.
100% duty cycle operation	Supports dropout operation down to V_OUT + headroom - critical for maintaining regulation as battery discharges.
Overtemperature and overcurrent protection	Prevents latch-up or destruction under fault conditions - enhances system reliability in unattended portable applications.

Applications

Cellular Telephones	Portable Computers
Use Scenario: Powering baseband processor I/O and RF front-end bias in GSM/UMTS handsets with single Li-Ion cell. IC Role / Device Role / Timing Role: Primary 1.5 V point-of-load regulator delivering clean, low-noise supply independent of battery voltage sag. Use Value: 45 µA PFM quiescent current extends talk time; 2.0 MHz switching avoids audible noise and eases EMI filtering.	Use Scenario: Supplying memory interface and touch controller in sub-notebook or tablet with dual NiMH cells. IC Role / Device Role / Timing Role: Fixed 1.5 V regulator replacing linear solutions to reduce heat and improve battery life. Use Value: >90% efficiency at 300 mA load cuts power loss by >70% vs. LDO, lowering thermal load on compact chassis.
Digital Cameras	USB Powered Devices
Use Scenario: Providing image sensor analog core voltage and ISP logic rail in compact digital still/video cameras. IC Role / Device Role / Timing Role: High-efficiency buck converter operating from 3.3 V USB or 3.6 V Li-Ion source. Use Value: 500 mA capability supports burst capture; 1.5 V output matches common sensor I/O requirements.	Use Scenario: Regulating 5 V USB supply to 1.5 V for Bluetooth/Wi-Fi SoCs and peripheral ICs in dongles or adapters. IC Role / Device Role / Timing Role: Compact, self-contained DC-DC stage enabling direct USB bus powering without wall adapter. Use Value: TSOT-23-5 footprint fits tight USB-A plug-in spaces; 0.1 µA shutdown enables host-controlled deep sleep.

Cellular Telephones

Portable Computers

Use Scenario: Powering baseband processor I/O and RF front-end bias in GSM/UMTS handsets with single Li-Ion cell.

IC Role / Device Role / Timing Role: Primary 1.5 V point-of-load regulator delivering clean, low-noise supply independent of battery voltage sag.

Use Value: 45 µA PFM quiescent current extends talk time; 2.0 MHz switching avoids audible noise and eases EMI filtering.

Use Scenario: Supplying memory interface and touch controller in sub-notebook or tablet with dual NiMH cells.

IC Role / Device Role / Timing Role: Fixed 1.5 V regulator replacing linear solutions to reduce heat and improve battery life.

Use Value: >90% efficiency at 300 mA load cuts power loss by >70% vs. LDO, lowering thermal load on compact chassis.

Digital Cameras

USB Powered Devices

Use Scenario: Providing image sensor analog core voltage and ISP logic rail in compact digital still/video cameras.

IC Role / Device Role / Timing Role: High-efficiency buck converter operating from 3.3 V USB or 3.6 V Li-Ion source.

Use Value: 500 mA capability supports burst capture; 1.5 V output matches common sensor I/O requirements.

Use Scenario: Regulating 5 V USB supply to 1.5 V for Bluetooth/Wi-Fi SoCs and peripheral ICs in dongles or adapters.

IC Role / Device Role / Timing Role: Compact, self-contained DC-DC stage enabling direct USB bus powering without wall adapter.

Use Value: TSOT-23-5 footprint fits tight USB-A plug-in spaces; 0.1 µA shutdown enables host-controlled deep sleep.

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, 400 mA max, 3.6 MHz switching, 17 µA quiescent current - higher frequency, lower current rating.	Preferred for ultra-small footprints and higher switching noise tolerance; unsuitable for >400 mA loads.	Select when board space is more constrained than current demand and higher-frequency ripple is acceptable.
RT8059ZSP	Fixed 1.5 V output, 600 mA max, 1.5 MHz switching, 25 µA quiescent current - higher current, lower frequency, different package (SOT-23-5).	Better suited for higher-current peripherals; lower switching frequency may require larger LC filter components.	Select when load exceeds 500 mA or when thermal performance under sustained 500 mA is marginal with MCP1603T-150I/OS.

Compared with TPS62231DRYR and RT8059ZSP, the MCP1603T-150I/OS offers the best balance of 500 mA capability, 45 µA light-load IQ, and proven robustness in battery-powered consumer applications - making it ideal where runtime, reliability, and moderate current coexist.

Availability

MCP1603T-150I/OS is available at Aetrix Electronics and suitable for cellular telephones, portable computers, and digital cameras requiring stable component supply with long-term industrial availability and consistent parametric performance.

Supply support for MCP1603T-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 battery-powered portable electronics - emphasizing minimal external components, small footprint, and wide-input-voltage adaptability.

FAQ

What is the output voltage tolerance of the MCP1603T-150I/OS over temperature?

The MCP1603T-150I/OS has a fixed 1.5 V output with ±2.5% tolerance over the full operating temperature range of –40°C to +85°C. This specification is guaranteed per Microchip's DS22042B datasheet Section 1.0, Electrical Characteristics, and reflects stability under varying thermal conditions without external trimming.

Does the MCP1603T-150I/OS require external compensation components?

No, the MCP1603T-150I/OS is internally compensated and requires no external compensation network when used in fixed-output configuration. The device integrates all necessary loop compensation, allowing full functionality with only three external components: input capacitor, output capacitor, and inductor - as confirmed in DS22042B Section 4.1 and Figure 1-1.

What is the minimum load requirement for regulation on the MCP1603T-150I/OS?

The MCP1603T-150I/OS does not require a minimum load for regulation because it supports automatic PFM/PWM mode transition. Unlike the PWM-only MCP1603B variant, this part maintains regulation down to zero load in PFM mode - verified in DS22042B Section 4.2.1.1 and Figure 2-15 (which applies only to MCP1603B).

How does the MCP1603T-150I/OS handle thermal overload?

The MCP1603T-150I/OS includes integrated overtemperature protection that shuts down the regulator when junction temperature exceeds ~150°C. After shutdown, it automatically restarts once the junction cools by ~10°C. This behavior is documented in DS22042B Section 4.4 and Table 1-1, and applies regardless of load or input voltage condition.

Can the MCP1603T-150I/OS operate with a 2.5 V input supplying a 1.5 V output?

Yes, the MCP1603T-150I/OS supports 2.5 V input for 1.5 V output, provided the input remains ≥2.7 V under load. Its absolute minimum input is 2.7 V per datasheet Section 1.0; operation below this risks UVLO activation or regulation loss. At 2.7 V input, the device sustains 100% duty cycle to maintain 1.5 V output - confirmed in DS22042B Section 5.1 and Figure 2-11.

MCP1603T-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

MCP1603T-150I/OS FAQ

1.How can I place an order for MCP1603T-150I/OS through Aetrix?

Please submit a Request for Quotation (RFQ) for MCP1603T-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 MCP1603T-150I/OS reliable?

The price and inventory of MCP1603T-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 MCP1603T-150I/OS is usually 5 days.

3.What payment methods are accepted for MCP1603T-150I/OS?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1603T-150I/OS transactions.

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4.How is shipping managed for MCP1603T-150I/OS?

MCP1603T-150I/OS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MCP1603T-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 MCP1603T-150I/OS?

For technical support, including MCP1603T-150I/OS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1603T-150I/OS requirements.

6.How does Aetrix verify that MCP1603T-150I/OS is sourced from the original manufacturer or authorized distributors?

All MCP1603T-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 MCP1603T-150I/OS meets industry standards.

7.What is the process for return or replacement of MCP1603T-150I/OS?

All MCP1603T-150I/OS units undergo pre-shipment inspection (PSI). If there is an issue with MCP1603T-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 MCP1603T-150I/OS part is unused and in its original packaging.

Return procedure for MCP1603T-150I/OS:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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