My Inquiry
My Account
Microchip Technology MCP1642DT-ADJI/MS
- Part No.:
- MCP1642DT-ADJI/MS
- Manufacturer:
- Microchip Technology
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MCP1642DT-ADJI/MS.pdf
- Description:
- IC REG BOOST ADJ 800MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,675
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MCP1642DT-ADJI/MS from Microchip Technology is a synchronous step-up DC-DC converter optimized for ultra-low-voltage battery-powered systems. It delivers up to 1 A output at 5.0 V from ≥3.6 V input, features 1.21 V feedback reference, 1 MHz fixed-frequency PWM operation, and true load disconnect shutdown mode. It is used in PIC® MCU power supplies and single-cell Li-Ion to 5 V conversion.
For engineers reviewing the MCP1642DT-ADJI/MS datasheet, MCP1642DT-ADJI/MS pinout, MCP1642DT-ADJI/MS application, or MCP1642DT-ADJI/MS equivalent, key selection criteria include low-startup voltage (0.65 V), adjustable output range (1.8–5.5 V), integrated synchronous rectification, 1.8 A peak switch current limit, and MSOP-8 package compatibility with thermal pad.
Technical Context
The MCP1642DT-ADJI/MS implements peak-current-mode control with adaptive slope compensation and an internal 1 MHz oscillator. Its low-noise anti-ringing switch suppresses high-frequency ringing during discontinuous conduction mode, reducing EMI without external snubbers.
Startup begins at 0.65 V (typical, 3.3 V output), sustained down to 0.35 V input under light load. The device integrates N-Channel (0.15 Ω RDS(ON)) and P-Channel (0.3 Ω RDS(ON)) synchronous switches, internal compensation, soft-start (550 µs), and overtemperature protection with 150 °C trip and 35 °C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 0.35 V to 5.5 V - supports deeply discharged alkaline/Li-ion cells; no UVLO circuitry. |
| Output Voltage Range | 1.8 V to 5.5 V - set via external resistor divider; VFB = 1.21 V ±3%. |
| Switching Frequency | 1.0 MHz ±15% - fixed-frequency PWM enables predictable EMI filtering and small passive sizing. |
| Peak Switch Current Limit | 1.8 A typical - determines maximum deliverable output current based on VIN/VOUT ratio. |
| Efficiency | Up to 96% - achieved via synchronous rectification and low RDS(ON) switches. |
| Shutdown Current | 1 µA - enables multi-year battery life in standby; true output disconnect isolates VOUT from VIN. |
| Operating Temperature | –40 °C to +85 °C ambient - qualified for industrial portable equipment environments. |
Pinout & Package
Package: 8-Lead MSOP with exposed thermal pad (EP). Thermal resistance θJA = 211 °C/W. EP must be soldered to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - EN | Enable logic input | Active-high enable; threshold is 75% of VIN - eliminates need for level-shifting in battery systems. |
| 2 - NC | No connect | Unbonded pin; must remain unconnected per datasheet - not usable as spare or ground. |
| 3 - PG | Open-drain Power Good | Asserts low when VOUT falls below 90% of regulation - interfaces directly with MCU GPIO for supply monitoring. |
| 4 - VOUT | Regulated output node | High-current output terminal; connects to P-Channel source and external output capacitor - requires low-ESR ceramic cap. |
| 5 - SW | Switch node | Connects boost inductor; carries up to 1.8 A peak current - routing must minimize loop area to reduce EMI. |
| 6 - PGND | Power ground return | High-current return path for N-Channel switch - must be tied externally to SGND and EP for stable operation. |
| 7 - SGND | Signal ground reference | Low-noise reference for error amplifier and VFB comparator - shared with PGND but routed separately before tie-point. |
| 8 - VIN | Input supply | Accepts 0.35–5.5 V; requires ≥4.7 µF local bypass capacitor - decoupling critical for low-voltage start-up stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low start-up voltage | 0.65 V typical (3.3 V output) - enables use with single NiMH or near-dead alkaline cells. |
| Synchronous rectification | Integrated 0.15 Ω N-Channel and 0.3 Ω P-Channel MOSFETs - eliminates external diode losses and improves light-load efficiency. |
| True output disconnect | EN = low disables both switches and breaks DC path from VIN to VOUT - prevents battery drain into powered-off loads. |
| Anti-ringing switch control | Integrated damping circuit at SW node - suppresses high-frequency oscillation without external snubber components. |
| Internal compensation | Complete Type II compensation network embedded - reduces BOM count and eliminates tuning effort. |
Applications
| PIC® MCU Power Supply | USB Emergency Backup Charger |
|---|---|
|
Use Scenario: Powering 3.3 V PIC microcontrollers from a single 1.2–1.6 V alkaline cell in handheld medical sensors. IC Role / Device Role / Timing Role: Primary regulated DC-DC converter supplying core logic and I/O rails; no timing function. Use Value: Enables full MCU operation down to 0.35 V input, extending battery life by >30% versus non-synchronous alternatives. |
Use Scenario: Converting 1.5 V AA battery output to 5.0 V USB power for emergency smartphone charging in field kits. IC Role / Device Role / Timing Role: Step-up regulator delivering regulated 5 V to USB VBUS line; no data interface. Use Value: Delivers >1 A at 5.0 V from ≥3.6 V input, supporting USB BC1.2 charging profiles without external LDO post-regulation. |
| Wireless Sensor Node | GPS Receiver Power |
|
Use Scenario: Supplying 3.3 V to low-power LoRaWAN transceivers and sensors operating intermittently from two AA batteries. IC Role / Device Role / Timing Role: High-efficiency boost converter enabling duty-cycled operation; PG signal triggers wake-up sequencing. Use Value: 1 µA shutdown current and 96% peak efficiency preserve battery capacity across multi-year deployments. |
Use Scenario: Providing stable 3.3 V rail to GPS modules in asset trackers powered by single Li-SOCl₂ primary cells. IC Role / Device Role / Timing Role: Main power source for RF front-end and baseband ICs; PG output validates VOUT before GNSS acquisition. Use Value: Low-noise anti-ringing control minimizes switching artifacts that degrade GPS signal-to-noise ratio (SNR). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61200DRCT | 0.3 V min start-up; 1.2 A max output; no true disconnect; 2x2 DFN only | Lacks output isolation in shutdown - unsuitable where load backfeed must be prevented | Prefer MCP1642DT-ADJI/MS when true VIN–VOUT isolation and MSOP-8 layout compatibility are required. |
| SP6650EM5-L/TR | 0.9 V min start-up; 1.5 A switch; fixed 3.3 V/5.0 V only; SOT-23-5 | No adjustable output or PG pin; limited thermal performance (θJA ≈ 250 °C/W) | Prefer MCP1642DT-ADJI/MS for designs needing 1.8–5.5 V adjustment, PG monitoring, or higher reliability in industrial ambient. |
Compared with TPS61200DRCT and SP6650EM5-L/TR, the MCP1642DT-ADJI/MS uniquely combines ultra-low start-up voltage, true output disconnect, adjustable output, and MSOP-8 thermal performance - making it optimal for long-life, battery-isolated, multi-rail portable systems.
Availability
MCP1642DT-ADJI/MS is available at Aetrix Electronics and suitable for wireless sensor nodes, GPS receivers, and PIC® MCU power supplies requiring stable component supply across multi-year production cycles.
Supply support for MCP1642DT-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 Inc. is a leading provider of microcontroller, analog, FPGA, and power management semiconductors, headquartered in Chandler, Arizona.
The MCP1642B/D product line was designed specifically for ultra-low-voltage, high-efficiency boost conversion in single- and multi-cell battery-powered portable electronics - emphasizing startup robustness, minimal external components, and thermal resilience in compact packages.
FAQ
What is the minimum input voltage required for MCP1642DT-ADJI/MS to start regulating 3.3 V output?
The MCP1642DT-ADJI/MS starts regulating a 3.3 V output at 0.65 V typical input voltage with a 1 mA resistive load. This ultra-low start-up capability allows operation from nearly depleted alkaline or NiMH cells. The device continues regulation down to 0.35 V input under light load conditions, confirmed in DS20005253A-page 3 DC Characteristics table.
Does MCP1642DT-ADJI/MS support adjustable output voltage, and how is it configured?
Yes, MCP1642DT-ADJI/MS is the adjustable version (denoted by "ADJ" in the part number) and supports output voltages from 1.8 V to 5.5 V using an external resistor divider connected to the VFB pin. The feedback reference is precisely 1.21 V, and design equations for RTOP/RBOT are provided in Section 5.2 of the datasheet. Fixed-output variants (e.g., -33, -50) omit the VFB connection.
What shutdown behavior does MCP1642DT-ADJI/MS implement, and how does it differ from bypass mode?
MCP1642DT-ADJI/MS implements true output disconnect shutdown: when EN is pulled low, both internal MOSFETs turn off, breaking the DC path between VIN and VOUT. This prevents battery discharge into powered-off loads. In contrast, the MCP1642D variant provides input-to-output bypass - connecting VIN to VOUT in shutdown - which is unsuitable where load isolation is mandatory.
Can MCP1642DT-ADJI/MS drive a 500 mA load at 5.0 V from a 3.3 V input?
Yes, MCP1642DT-ADJI/MS delivers >800 mA at 5.0 V output when VIN ≥ 3.3 V, as verified in the "IOUT > 800 mA @ 3.3V VIN, 5.0V VOUT" specification on DS20005253A-page 1. This performance assumes proper layout, 4.7 µH inductor, and 4.7–10 µF input/output capacitors per the typical application circuit.
Is the exposed thermal pad (EP) on MCP1642DT-ADJI/MS electrically connected internally?
No, the exposed thermal pad (EP) on MCP1642DT-ADJI/MS has no internal electrical connection to SGND or PGND. Per DS20005253A-page 11, it must be externally connected to the same ground potential as SGND and PGND on the PCB - typically via multiple thermal vias to an internal ground plane - to ensure thermal performance (θJA = 211 °C/W) and electrical stability.
MCP1642DT-ADJI/MS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 0.65V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 800mA
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
MCP1642DT-ADJI/MS FAQ
1.How can I place an order for MCP1642DT-ADJI/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1642DT-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 MCP1642DT-ADJI/MS reliable?
The price and inventory of MCP1642DT-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 MCP1642DT-ADJI/MS is usually 5 days.
3.What payment methods are accepted for MCP1642DT-ADJI/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1642DT-ADJI/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1642DT-ADJI/MS?
MCP1642DT-ADJI/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1642DT-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 MCP1642DT-ADJI/MS?
For technical support, including MCP1642DT-ADJI/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1642DT-ADJI/MS requirements.
6.How does Aetrix verify that MCP1642DT-ADJI/MS is sourced from the original manufacturer or authorized distributors?
All MCP1642DT-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 MCP1642DT-ADJI/MS meets industry standards.
7.What is the process for return or replacement of MCP1642DT-ADJI/MS?
All MCP1642DT-ADJI/MS units undergo pre-shipment inspection (PSI). If there is an issue with MCP1642DT-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 MCP1642DT-ADJI/MS part is unused and in its original packaging.
Return procedure for MCP1642DT-ADJI/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MCP1642DT-ADJI/MS Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
