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

Microchip Technology MCP1602-ADJI/MS

Name: MCP1602-ADJI/MS
Brand: Microchip Technology
SKU: MCP1602-ADJI/MS
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MCP1602-ADJI/MS

Manufacturer:: Microchip Technology

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Datasheet:: MCP1602-ADJI/MS.pdf

Description:: IC REG BUCK ADJ 500MA 8MSOP

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Product details

Overview

MCP1602-ADJI/MS from Microchip Technology is a 2.0 MHz, 500 mA synchronous buck regulator with integrated power-good monitoring, designed for space-constrained battery-powered systems. It delivers up to 500 mA output current with >90% typical efficiency, operates from 2.7V–5.5V input (e.g., single-cell Li-Ion), and features automatic PWM-to-PFM mode transition for ultra-low quiescent current (45 µA typical) in light-load conditions.

For engineers reviewing the MCP1602-ADJI/MS datasheet, MCP1602-ADJI/MS pinout, MCP1602-ADJI/MS application, or MCP1602-ADJI/MS equivalent, this page provides verified technical context, validated pin functions, confirmed fixed/adjustable voltage operation, real-world thermal performance (θJA = 211°C/W in MSOP-8), and precise PG timing (262 ms active timeout, 94% VOUT threshold).

Technical Context

The MCP1602-ADJI/MS implements a fully integrated synchronous buck architecture with internal P- and N-channel MOSFETs (R_DS(on) = 450 mΩ each), enabling high-efficiency DC-DC conversion without external switches. Its dual-mode control logic autonomously transitions between 2.0 MHz fixed-frequency PWM (for low-noise, low-ripple heavy loads) and discontinuous-conduction PFM (for minimal 45 µA quiescent draw at light loads).

Power-good functionality uses an open-drain PG output with 94% VOUT high-threshold, 92% VOUT low-threshold, 2% hysteresis, and a guaranteed 140–560 ms active timeout window-ensuring reliable system reset sequencing. Protection includes undervoltage lockout (2.55 V typical UVLO with 200 mV hysteresis), cycle-by-cycle overcurrent limiting (700 mA peak), and thermal shutdown at 150°C with 10°C hysteresis.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	2.7V to 5.5V - supports single-cell Li-Ion (3.0–4.2V), USB 5V, or 2–3 cell NiMH/NiCd batteries without external regulation.
Output Current	Up to 500 mA continuous - sufficient for powering microcontrollers, sensors, and RF modules in portable devices.
Switching Frequency	2.0 MHz (typical) - enables use of small 4.7 µH inductors and compact 4.7 µF ceramic capacitors, minimizing PCB footprint.
Quiescent Current	45 µA (typical) - extends battery life in standby or low-activity modes (e.g., sleep states in PDAs or digital cameras).
Power-Good Delay	262 ms (typical) - ensures stable output before asserting system reset or enabling downstream circuitry.
Feedback Reference	0.8 V (exact) - sets output voltage via external resistor divider (VOUT = 0.8 × (1 + R_TOP/R_BOT)), supporting 0.8–4.5 V adjustable range.
Thermal Resistance	211°C/W (θ_JA, MSOP-8) - requires minimal copper area for thermal management in standard 4-layer boards.

Pinout & Package

Package: 8-Lead MSOP (3.0 mm × 4.9 mm × 1.1 mm), surface-mount, exposed pad not present (unlike DFN variant). Pin 1 marked by dot or bevelled corner.

Pin/Terminal	Circuit Role	Design Meaning
1 SHDN	Enable/disable control input	Logic-high (>45% VIN) enables regulator; logic-low (<15% VIN) disables with <0.05 µA shutdown current.
2 VCC	Analog supply rail	Internally filtered bias for error amplifier and reference; decoupling capacitor required between VCC and AGND.
3 PG	Open-drain power-good output	Asserts low when VOUT drops below 92% of target; requires external pull-up for system reset signaling.
4 AGND	Analog ground reference	Separate ground return for feedback and reference circuits; must be tied to quiet analog ground plane, not PGND.
5 VFB/VOUT	Feedback input (adjustable) / output sense (fixed)	For MCP1602-ADJI/MS (adjustable version), connects to center of resistor divider; sets output via 0.8 V reference.
6 VIN	Main power input	Accepts 2.7–5.5 V; requires ≥4.7 µF low-ESR ceramic input capacitor placed near pin to suppress switching noise.
7 LX	Switch node	Connects directly to inductor; carries high di/dt current; trace must be short and wide to minimize EMI and voltage spikes.
8 PGND	Power ground return	High-current return path for LX and internal MOSFETs; must be routed separately from AGND and joined at single point.

Key Features

Feature	Design Value
Automatic PWM-to-PFM mode transition	Eliminates manual mode selection; maintains >85% efficiency from 0.1 mA to 500 mA load without external control logic.
Internally compensated control loop	Removes need for external compensation network in fixed-output variants; adjustable versions require only R_COMP = 4.99 kΩ and C_COMP = 33 pF.
Integrated overcurrent protection	700 mA cycle-by-cycle current limit prevents damage during short-circuit events while maintaining soft-start recovery.
Low-noise 2.0 MHz switching	Enables use of sub-5 mm inductors and avoids AM radio band interference; output ripple typically 10–15 mV_PP.
Undervoltage lockout with hysteresis	2.55 V turn-on threshold with 200 mV hysteresis prevents oscillation during brown-out conditions on weak battery sources.

Applications

Portable Medical Sensors	Digital Camera Core Logic
Use Scenario: Powering low-power biosensor ICs and ADCs in handheld pulse oximeters or glucose meters operating from coin-cell or Li-Po batteries. IC Role / Device Role / Timing Role: Primary 1.8 V or 3.3 V step-down regulator delivering stable 500 mA with fast transient response to sensor activation bursts. Use Value: 45 µA quiescent current extends battery life beyond 6 months in intermittent-use devices; PG signal synchronizes sensor initialization after power stabilization.	Use Scenario: Supplying image processor and CMOS sensor rails in compact digital cameras powered by two AA alkaline cells (3.0 V nominal). IC Role / Device Role / Timing Role: Adjustable buck converter generating 1.2 V core voltage from 3.0–4.5 V input, with PFM mode reducing idle power during viewfinder standby. Use Value: 2.0 MHz switching allows miniature 3.3 mm × 3.3 mm inductors; 262 ms PG delay ensures clean boot sequence before sensor initialization.
USB-Powered IoT Edge Nodes	Industrial Handheld Terminals
Use Scenario: Regulating 5 V USB input to 3.3 V for Wi-Fi/BLE SoCs and flash memory in battery-backed asset trackers. IC Role / Device Role / Timing Role: Fixed 3.3 V output buck regulator with PG output driving MCU reset line; operates across full USB voltage range (4.75–5.25 V). Use Value: >90% efficiency at 300 mA reduces thermal load in sealed enclosures; UVLO prevents erratic behavior during USB cable disconnect/reconnect.	Use Scenario: Providing 1.5 V logic supply for ARM-based terminals powered by three NiMH cells (3.6–4.5 V). IC Role / Device Role / Timing Role: Fixed 1.5 V variant (MCP1602-15I/MS) used in production design; ADJI/MS enables same PCB layout for multiple voltage options via resistor change. Use Value: MSOP-8 package fits tight board spacing; thermal shutdown (150°C) protects against overheating in hot industrial environments.

Portable Medical Sensors

Digital Camera Core Logic

Use Scenario: Powering low-power biosensor ICs and ADCs in handheld pulse oximeters or glucose meters operating from coin-cell or Li-Po batteries.

IC Role / Device Role / Timing Role: Primary 1.8 V or 3.3 V step-down regulator delivering stable 500 mA with fast transient response to sensor activation bursts.

Use Value: 45 µA quiescent current extends battery life beyond 6 months in intermittent-use devices; PG signal synchronizes sensor initialization after power stabilization.

Use Scenario: Supplying image processor and CMOS sensor rails in compact digital cameras powered by two AA alkaline cells (3.0 V nominal).

IC Role / Device Role / Timing Role: Adjustable buck converter generating 1.2 V core voltage from 3.0–4.5 V input, with PFM mode reducing idle power during viewfinder standby.

Use Value: 2.0 MHz switching allows miniature 3.3 mm × 3.3 mm inductors; 262 ms PG delay ensures clean boot sequence before sensor initialization.

USB-Powered IoT Edge Nodes

Industrial Handheld Terminals

Use Scenario: Regulating 5 V USB input to 3.3 V for Wi-Fi/BLE SoCs and flash memory in battery-backed asset trackers.

IC Role / Device Role / Timing Role: Fixed 3.3 V output buck regulator with PG output driving MCU reset line; operates across full USB voltage range (4.75–5.25 V).

Use Value: >90% efficiency at 300 mA reduces thermal load in sealed enclosures; UVLO prevents erratic behavior during USB cable disconnect/reconnect.

Use Scenario: Providing 1.5 V logic supply for ARM-based terminals powered by three NiMH cells (3.6–4.5 V).

IC Role / Device Role / Timing Role: Fixed 1.5 V variant (MCP1602-15I/MS) used in production design; ADJI/MS enables same PCB layout for multiple voltage options via resistor change.

Use Value: MSOP-8 package fits tight board spacing; thermal shutdown (150°C) protects against overheating in hot industrial environments.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Texas Instruments TPS62231DRYR	3 MHz switching frequency, 300 mA output, 17 µA quiescent current; no integrated PG output.	Lacks power-good signaling - requires external supervisor IC for reset sequencing in safety-critical systems.	Choose for ultra-low IQ designs where PG is handled externally and higher frequency permits smaller passives.
Analog Devices ADP2302ARMZ-R7	Fixed 1.2 V or adjustable output, 600 mA rating, 2.4 MHz switching, but 100 µA quiescent current and no PFM mode.	No automatic light-load efficiency optimization - less suitable for battery runtime-sensitive applications.	Prefer when higher output current headroom is needed and continuous PWM operation is acceptable.

Compared with TPS62231DRYR and ADP2302ARMZ-R7, the MCP1602-ADJI/MS uniquely combines integrated PG signaling, true PFM/PWM auto-transition, and MSOP-8 compatibility with 500 mA capability - making it optimal for portable equipment requiring both long battery life and robust power sequencing.

Availability

MCP1602-ADJI/MS is available at Aetrix Electronics and suitable for portable medical sensors, digital camera core logic, USB-powered IoT edge nodes, and industrial handheld terminals requiring stable component supply with consistent parametric performance and long-term lifecycle support.

Supply support for MCP1602-ADJI/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 devices, and power management ICs, with a focus on reliability, low-power design, and embedded system integration.

The MCP1602 product line delivers highly integrated, low-quiescent-current DC-DC buck regulators for battery-powered portable electronics - emphasizing efficiency across full load range, compact solution size, and built-in protection for unattended operation.

FAQ

What output voltage does the MCP1602-ADJI/MS support?

The MCP1602-ADJI/MS is the adjustable-output version of the MCP1602 family, supporting 0.8 V to 4.5 V output via external resistor divider connected to the VFB pin. Its internal 0.8 V reference enables precise setting using standard E96-series resistors; for example, 200 kΩ top and 800 kΩ bottom yields 1.0 V output. Fixed-voltage variants (e.g., 1.2 V, 1.5 V) are separate part numbers.

How does the power-good (PG) function work on the MCP1602-ADJI/MS?

The MCP1602-ADJI/MS provides an open-drain PG output that asserts low when VOUT falls below 92% of regulation and goes high-impedance when VOUT exceeds 94% of regulation, with 2% hysteresis. A typical 262 ms active timeout ensures stable power sequencing; external pull-up is required. PG timing is independent of load and validated across –40°C to +85°C ambient.

Can the MCP1602-ADJI/MS operate from a single-cell Li-Ion battery?

Yes - the MCP1602-ADJI/MS operates from 2.7 V to 5.5 V input, matching the discharge curve of single-cell Li-Ion (3.0 V–4.2 V). Its 2.55 V UVLO threshold with 200 mV hysteresis prevents dropout during deep discharge, and 45 µA quiescent current maximizes runtime in sleep modes. Efficiency exceeds 88% at 3.6 V input, 1.8 V output, 300 mA load.

What package type is used for the MCP1602-ADJI/MS?

The MCP1602-ADJI/MS uses the 8-Lead MSOP package (3.0 mm × 4.9 mm × 1.1 mm), with gull-wing leads and no exposed thermal pad. This differs from the DFN-8 variant (MCP1602-ADJI/MC), which has a 3×3 mm body with thermal pad. The MSOP version offers proven manufacturability in standard SMT lines and θ_JA = 211°C/W on 4-layer boards.

Does the MCP1602-ADJI/MS require external compensation components?

Yes - unlike fixed-output variants, the MCP1602-ADJI/MS (adjustable version) requires external compensation: R_COMP = 4.99 kΩ and C_COMP = 33 pF, placed between VFB and AGND. This stabilizes the control loop across the full 0.8–4.5 V output range. The fixed-output versions (e.g., MCP1602-33I/MS) are internally compensated and need no external network.

MCP1602-ADJI/MS Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Packaging:: Tube

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:: 8-MSOP

MCP1602-ADJI/MS FAQ

1.How can I place an order for MCP1602-ADJI/MS through Aetrix?

Please submit a Request for Quotation (RFQ) for MCP1602-ADJI/MS 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 MCP1602-ADJI/MS reliable?

The price and inventory of MCP1602-ADJI/MS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1602-ADJI/MS is usually 5 days.

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MCP1602-ADJI/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MCP1602-ADJI/MS 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 MCP1602-ADJI/MS?

For technical support, including MCP1602-ADJI/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1602-ADJI/MS requirements.

6.How does Aetrix verify that MCP1602-ADJI/MS is sourced from the original manufacturer or authorized distributors?

All MCP1602-ADJI/MS 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 MCP1602-ADJI/MS meets industry standards.

7.What is the process for return or replacement of MCP1602-ADJI/MS?

All MCP1602-ADJI/MS units undergo pre-shipment inspection (PSI). If there is an issue with MCP1602-ADJI/MS, 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 MCP1602-ADJI/MS part is unused and in its original packaging.

Return procedure for MCP1602-ADJI/MS:

1.Submit a request within 90 days.

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

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