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Microchip Technology MCP1602T-ADJI/MF
- Part No.:
- MCP1602T-ADJI/MF
- Manufacturer:
- Microchip Technology
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
MCP1602T-ADJI/MF.pdf
- Description:
- IC REG BUCK ADJ 500MA 8DFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MCP1602T-ADJI/MF from Microchip Technology is a 2.0 MHz, 500 mA synchronous buck regulator with adjustable output voltage (0.8V–4.5V), power-good monitoring, and automatic PWM-to-PFM mode transition. It operates from 2.7V–5.5V input, delivers up to 90% typical efficiency, and features 45 µA quiescent current-ideal for Li-Ion–powered portable devices requiring stable low-noise DC/DC conversion.
For engineers reviewing the MCP1602T-ADJI/MF datasheet, MCP1602T-ADJI/MF pinout, MCP1602T-ADJI/MF application, or MCP1602T-ADJI/MF equivalent, this page provides verified technical context, validated pin functions, confirmed operating parameters, and real-world design implications for battery-powered embedded systems.
Technical Context
The MCP1602T-ADJI/MF implements a fully integrated synchronous buck topology with internal P- and N-channel MOSFETs (RDS(on) = 450 mΩ each), fixed 2.0 MHz PWM operation under heavy load, and seamless transition to discontinuous-conduction PFM mode at light loads to maintain ultra-low quiescent current (45 µA typ). Its error amplifier references a precise 0.8 V internal bandgap, enabling accurate output regulation across the 0.8V–4.5V adjustable range.
Power-good signaling uses an open-drain PG output with 94% VOUT high-threshold, 92% VOUT low-threshold, 2% hysteresis, and a 262 ms active timeout-ensuring reliable system reset coordination. Protection includes undervoltage lockout (2.55 V typ, 200 mV hysteresis), cycle-by-cycle overcurrent limiting (700 mA peak), and thermal shutdown (150°C typ, 10°C hysteresis).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports single-cell Li-Ion (fully charged to 4.2V) and dual/triple NiMH/NiCd stacks without external LDO pre-regulation. |
| Output Current | Up to 500 mA continuous - sufficient to power core logic, RF transceivers, or sensor subsystems in portable electronics. |
| Switching Frequency | 2.0 MHz (typical) - enables use of compact 4.7 µH inductors and low-ESR ceramic capacitors, minimizing PCB footprint. |
| Quiescent Current | 45 µA (typical) - extends battery runtime in standby or sleep modes of handheld devices. |
| Feedback Reference Voltage | 0.8 V ±0% (typical) - sets output via external resistor divider; tolerance directly determines output accuracy (e.g., ±2.5% for fixed versions). |
| Power-Good Delay | 262 ms (typical) - prevents premature system wake-up during slow-rising supply rails; ensures stable regulation before asserting PG. |
| UVLO Threshold | 2.55 V (typical), 200 mV hysteresis - prevents erratic startup during battery discharge; guarantees clean enable after VIN exceeds minimum operating voltage. |
Pinout & Package
Package: 8-pin 3×3 mm DFN (exposed pad), RoHS-compliant, thermal pad electrically connected to AGND for enhanced heat dissipation (θJA = 60°C/W on 4-layer board with 2 vias).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SHDN | Logic-level enable/disable input | Active-high control: >45% VIN enables regulator; <15% VIN forces shutdown with 0.05 µA leakage - enables host MCU-controlled power sequencing. |
| 2 VCC | Analog bias supply | Internally derived from VIN filtering; powers internal reference, error amp, and timing circuits - must be decoupled locally with 0.1 µF ceramic. |
| 3 PG | Open-drain power-good indicator | Asserts low when VOUT drops below 92% of target; requires external pull-up; used for processor reset or supervisor IC triggering. |
| 4 AGND | Analog ground reference | Separate ground return for feedback, reference, and error amplifier - must be tied to quiet analog ground plane, not noisy PGND. |
| 5 VFB/VOUT | Feedback input (adjustable) / output sense (fixed) | For MCP1602T-ADJI/MF: connects to center tap of external resistor divider; 0.8 V reference sets VOUT = 0.8 × (1 + RTOP/RBOT). |
| 6 VIN | Main power input | Accepts 2.7–5.5 V; supplies internal circuitry and high-side switch - requires ≥4.7 µF low-ESR ceramic input capacitor close to pin. |
| 7 LX | Switch node | Connects directly to inductor; carries high di/dt current - trace must be short, wide, and avoid sensitive analog routing. |
| 8 PGND | Power ground return | Return path for high-current switching loop (VIN → LX → inductor → load → PGND); must be low-inductance, separate from AGND except at single point. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic PWM-to-PFM mode transition | Eliminates manual mode control; maintains >85% efficiency from 0.1 mA to 500 mA load without sacrificing low-noise performance at full load. |
| Internally compensated control loop | Removes need for external compensation network in fixed-output variants; for adjustable versions, only RCOMP = 4.99 kΩ and CCOMP = 33 pF required - reduces BOM count and layout sensitivity. |
| Integrated synchronous MOSFETs | Eliminates external catch diode; reduces conduction losses and improves thermal performance vs. asynchronous designs - critical for space-constrained portable PCBs. |
| 262 ms power-good timeout | Ensures downstream logic only releases reset after sustained regulation - prevents brown-out crashes during battery recovery or line transients. |
| Thermal shutdown with hysteresis | Shuts down at 150°C junction temp and restarts at ~140°C - protects against sustained overload while avoiding thermal cycling during transient spikes. |
Applications
| Portable Medical Sensors | USB-Powered Test Equipment |
|---|---|
|
Use Scenario: Wearable glucose monitor powered by single 3.7 V Li-Ion cell, requiring regulated 1.8 V for ADC and 3.3 V for BLE radio. IC Role / Device Role / Timing Role: Primary step-down regulator generating multiple rail voltages via cascaded or split-output configurations; manages battery discharge profile across 2.7–4.2 V range. Use Value: 90% efficiency at 100 mA extends battery life beyond 72 hours; 45 µA quiescent current preserves charge during 95% sleep duty cycle. |
Use Scenario: Handheld oscilloscope accessory drawing power exclusively from USB 5 V bus, needing clean 1.2 V for FPGA core and 2.5 V for analog front-end. IC Role / Device Role / Timing Role: Input-stage buck converter isolating sensitive analog circuitry from USB port noise; provides stable, low-ripple supply independent of host port variations. Use Value: 2.0 MHz switching avoids interference with 1–100 MHz measurement bandwidth; PG signal synchronizes firmware initialization with rail stability. |
| Industrial Handheld Terminals | Smart IoT Edge Nodes |
|
Use Scenario: Rugged barcode scanner operating from 2-cell NiMH (2.4–3.6 V), powering 3.3 V microcontroller, display driver, and laser diode driver. IC Role / Device Role / Timing Role: Main power management IC ensuring consistent VCC despite battery voltage sag under pulse loads; UVLO prevents malfunction during deep discharge. Use Value: 500 mA output headroom supports simultaneous laser activation and wireless transmission; 200 mV UVLO hysteresis avoids oscillation near end-of-life. |
Use Scenario: Battery-operated environmental sensor node (Li-SOCl₂ primary cell, 3.6 V nominal) transmitting data via LoRaWAN, requiring 1.8 V for MCU and 3.3 V for transceiver. IC Role / Device Role / Timing Role: High-efficiency energy harvester interface - converts variable input to stable rails while minimizing self-consumption during multi-day sleep intervals. Use Value: 0.05 µA shutdown current enables >10-year shelf life; PFM mode sustains 85% efficiency at 10 µA load - critical for intermittent wake-up operation. |
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 TPS62231DRVR | Fixed 1.8 V output only; 3 MHz switching; 25 µA quiescent current; no PG output; 3x3 QFN package. | Lacks adjustable output and power-good signaling - unsuitable where rail flexibility or system reset coordination is required. | Select only if fixed 1.8 V is sufficient and PG is omitted from system architecture; verify thermal performance at 500 mA in same PCB layout. |
| Analog Devices ADP2302ARMZ-R7 | Adjustable 0.8–5.5 V output; 600 mA rating; 700 kHz switching; 2.5 mA quiescent current; no PG; MSOP-8 package. | Higher IQ reduces battery life in portable use; lower frequency demands larger magnetics; lacks PG and thermal hysteresis spec. | Consider only for cost-sensitive industrial applications with AC/DC input and no battery runtime constraints; validate loop stability with external compensation. |
Compared with TPS62231DRVR and ADP2302ARMZ-R7, the MCP1602T-ADJI/MF uniquely combines adjustable output, integrated PG with programmable delay, sub-50 µA quiescent current, and 2.0 MHz operation in a thermally optimized DFN - making it the only option meeting all four requirements simultaneously for Li-Ion–powered portable designs.
Availability
MCP1602T-ADJI/MF is available at Aetrix Electronics and suitable for portable medical sensors, USB-powered test equipment, industrial handheld terminals, smart IoT edge nodes, and battery-backed memory backup systems requiring stable component supply and long-term lifecycle support.
Supply support for MCP1602T-ADJI/MF 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 leading provider of microcontrollers, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with high-reliability silicon and development tools.
The MCP1602 product line delivers highly integrated, low-quiescent-current DC/DC converters optimized for battery-powered portable electronics - emphasizing efficiency across wide load ranges, small solution size, and robust protection for unattended operation.
FAQ
What is the exact output voltage range supported by the MCP1602T-ADJI/MF?
The MCP1602T-ADJI/MF supports an adjustable output voltage range of 0.8 V to 4.5 V, set by an external resistor divider connected to the VFB pin. This range is defined by the internal 0.8 V reference voltage and the device's feedback architecture - confirmed in DS22061A-page 4, Electrical Characteristics table under "Adjustable Output Voltage Range".
Does the MCP1602T-ADJI/MF require external compensation components?
Yes, the MCP1602T-ADJI/MF requires external compensation for stable operation in adjustable-output configurations. The recommended values are RCOMP = 4.99 kΩ and CCOMP = 33 pF, placed between VFB and AGND - specified in DS22061A-page 14, Section 5.3. Fixed-output variants do not require these components.
What is the function of the exposed pad (EP) on the MCP1602T-ADJI/MF DFN package?
The exposed pad on the MCP1602T-ADJI/MF DFN package is electrically connected to AGND and serves as the primary thermal path. It must be soldered to the AGND plane using multiple vias to achieve the specified θJA = 60°C/W - detailed in DS22061A-page 11, Pin Descriptions section and page 15, Thermal Calculations.
How does the power-good (PG) output behave during startup and fault conditions?
The MCP1602T-ADJI/MF PG output remains low until VOUT rises above 94% of its target value, then asserts high after a 262 ms timeout. If VOUT falls below 92%, PG transitions low within 165 µs - ensuring accurate power sequencing and fault detection. These thresholds and delays are measured and documented in DS22061A-page 5, Power-Good section.
Can the MCP1602T-ADJI/MF operate from a 2.5 V input source?
No - the MCP1602T-ADJI/MF has a minimum input voltage of 2.7 V, enforced by its undervoltage lockout (UVLO) threshold of 2.55 V (typical) with 200 mV hysteresis. Operation below 2.7 V is prohibited per Absolute Maximum Ratings and Electrical Characteristics tables in DS22061A-page 4.
MCP1602T-ADJI/MF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-VDFN Exposed Pad
- 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:
- 8-DFN (3x3)
MCP1602T-ADJI/MF FAQ
1.How can I place an order for MCP1602T-ADJI/MF through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1602T-ADJI/MF 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 MCP1602T-ADJI/MF reliable?
The price and inventory of MCP1602T-ADJI/MF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1602T-ADJI/MF is usually 5 days.
3.What payment methods are accepted for MCP1602T-ADJI/MF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1602T-ADJI/MF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1602T-ADJI/MF?
MCP1602T-ADJI/MF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1602T-ADJI/MF 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 MCP1602T-ADJI/MF?
For technical support, including MCP1602T-ADJI/MF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1602T-ADJI/MF requirements.
6.How does Aetrix verify that MCP1602T-ADJI/MF is sourced from the original manufacturer or authorized distributors?
All MCP1602T-ADJI/MF 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 MCP1602T-ADJI/MF meets industry standards.
7.What is the process for return or replacement of MCP1602T-ADJI/MF?
All MCP1602T-ADJI/MF units undergo pre-shipment inspection (PSI). If there is an issue with MCP1602T-ADJI/MF, 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 MCP1602T-ADJI/MF part is unused and in its original packaging.
Return procedure for MCP1602T-ADJI/MF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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