Microchip Technology MCP1602T-330I/MS

Overview

MCP1602T-330I/MS from Microchip Technology is a fixed-output 3.3V, 500 mA synchronous buck DC-DC regulator in an 8-lead MSOP package, featuring 2.0 MHz PWM switching, 45 µA quiescent current, and integrated power-good monitoring with 262 ms delay - designed for Li-ion–powered portable equipment requiring stable low-noise 3.3V rail generation.

For engineers reviewing the MCP1602T-330I/MS datasheet, MCP1602T-330I/MS pinout, MCP1602T-330I/MS application, or MCP1602T-330I/MS equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options, and supply-chain support details specific to this fixed 3.3V MSOP variant.

Technical Context

The MCP1602T-330I/MS operates in automatic PWM-to-PFM mode transition: at heavy loads (>100 mA), it runs at a fixed 2.0 MHz (typical) for low ripple and noise; at light loads, it enters PFM mode to maintain 45 µA typical quiescent current. Its internal synchronous P-channel and N-channel MOSFETs eliminate external diode losses.

It integrates undervoltage lockout (2.55 V typical UVLO threshold with 200 mV hysteresis), overtemperature shutdown (150 °C trip, 10 °C hysteresis), cycle-by-cycle overcurrent protection (700 mA peak limit), and a precision open-drain power-good output that asserts after 262 ms when VOUT reaches ≥94% of 3.3V and deasserts when falling below 92%.

Key Specifications

Pinout & Package

Package: 8-lead MSOP (3.0 mm × 4.9 mm × 1.1 mm), exposed pad not present (unlike DFN variant); RoHS-compliant, rated for –40°C to +85°C ambient operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck regulator applications.

Compared with MCP1602T-330I/MS, the TPS62231DRYR offers lower IQ and higher frequency but omits PG functionality essential for reset coordination, while the ADP2303ARMZ-3.3-R7 provides robust 3 A capability and PG support at lower frequency - making it suitable for scaling up, not drop-in replacement.

Availability

MCP1602T-330I/MS is available at Aetrix Electronics and suitable for portable medical sensors, digital camera core logic, USB-powered test equipment, and industrial handheld terminals requiring stable component supply with guaranteed long-term sourcing.

Supply support for MCP1602T-330I/MS 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 manufacturer specializing in microcontrollers, analog, and power management ICs, with strong focus on embedded control and energy-efficient solutions.

The MCP1602 product line delivers highly integrated, low-quiescent-current synchronous buck regulators targeting battery-powered portable electronics - emphasizing simplicity, reliability, and minimal external component count.

FAQ

What is the input voltage range supported by the MCP1602T-330I/MS?

The MCP1602T-330I/MS supports an input voltage range of 2.7 V to 5.5 V. This allows direct operation from single-cell Li-ion batteries (2.7–4.2 V), two- or three-cell NiMH/NiCd packs, and standard USB 5 V supplies. The device incorporates undervoltage lockout (UVLO) with a 2.55 V typical turn-on threshold and 200 mV hysteresis to ensure clean startup and prevent brownout operation. The minimum input must also satisfy VIN ≥ VOUT + 0.5 V, which is met for the fixed 3.3 V output.

Does the MCP1602T-330I/MS require external compensation components?

No, the MCP1602T-330I/MS is internally compensated for its fixed 3.3 V output configuration. Unlike adjustable versions that require an external R-C compensation network (RCOMP = 4.99 kΩ, CCOMP = 33 pF), this variant eliminates those components entirely - reducing BOM count, PCB area, and design validation effort. The internal compensation ensures stable loop response across temperature and load conditions without user tuning.

How does the power-good (PG) function behave on the MCP1602T-330I/MS?

The MCP1602T-330I/MS features an open-drain power-good output that asserts low when VOUT falls below 92% of 3.3 V (≈3.04 V) and releases high when VOUT rises above 94% (≈3.10 V), with a typical 262 ms active timeout period. It includes 165 µs noise immunity delay on falling edges. This behavior enables reliable power sequencing - for example, holding a microcontroller in reset until the 3.3 V rail is fully settled and stable, preventing corrupted boot sequences.

What package type and thermal characteristics apply to the MCP1602T-330I/MS?

The MCP1602T-330I/MS uses the 8-lead MSOP package (3.0 mm × 4.9 mm), with θJA = 211 °C/W on a typical 4-layer board with internal ground plane. It operates across –40°C to +85°C ambient and supports junction temperatures up to +125°C continuously (+150°C transient shutdown). Unlike the DFN variant, the MSOP has no exposed thermal pad - so thermal performance relies on copper pour under the package and proper PGND/AGND separation per Microchip layout guidelines.

Can the MCP1602T-330I/MS be used in PFM mode only, or is PWM mode mandatory under load?

The MCP1602T-330I/MS automatically transitions between modes: it operates in fixed-frequency 2.0 MHz PWM mode under heavy loads (typically >100 mA) to minimize ripple and noise, and switches to PFM mode at light loads to reduce quiescent current to 45 µA. No external control is needed - the transition is seamless and transparent to the system. Attempting to force PFM-only operation is neither supported nor necessary; the IC's dual-mode architecture is intrinsic to its efficiency optimization across the full 0.1–500 mA load range.