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Microchip Technology MCP1642BT-ADJI/MS
- Part No.:
- MCP1642BT-ADJI/MS
- Manufacturer:
- Microchip Technology
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MCP1642BT-ADJI/MS.pdf
- Description:
- IC REG BOOST ADJ 800MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:10,263
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Product details
Overview
MCP1642BT-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 output disconnect shutdown mode. It targets PIC® MCU power rails in single-cell Li-Ion or alkaline portable devices.
For engineers reviewing the MCP1642BT-ADJI/MS datasheet, MCP1642BT-ADJI/MS pinout, MCP1642BT-ADJI/MS application, or MCP1642BT-ADJI/MS equivalent, key selection criteria include start-up voltage (0.65 V typical), peak switch current limit (1.8 A), adjustable output range (1.8–5.5 V), thermal shutdown threshold (+150 °C), and MSOP-8 package compatibility with exposed thermal pad.
Technical Context
The MCP1642BT-ADJI/MS implements peak-current-mode control with adaptive slope compensation, enabling stable operation across wide VIN–VOUT ratios. Its integrated N-channel boost switch (RDS(ON)N = 0.15 Ω) and P-channel synchronous rectifier (RDS(ON)P = 0.3 Ω) operate with internal compensation and anti-ringing control to suppress high-frequency noise at the SW node.
Startup begins at 0.65 V (3.3 V output, 1 mA load) using open-loop charge-pump-like pre-charge of VOUT via the P-channel switch, followed by closed-loop PWM regulation. The EN pin enables logic-controlled shutdown with <1 µA quiescent current, and PG provides open-drain power-good signaling at 90% VOUT regulation with 3% hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Start-up Voltage | 0.65 V typical - enables operation from deeply discharged alkaline or Li-Ion cells without external bias. |
| Switching Frequency | 1.0 MHz ±15% - supports compact 4.7 µH inductors and low-output-ripple design in space-constrained layouts. |
| Feedback Reference | 1.21 V ±2.5% - sets output via external resistor divider; enables precise 1.8–5.5 V adjustment with minimal quiescent error. |
| Peak Switch Current Limit | 1.8 A typical - determines maximum deliverable output current under boost ratio and efficiency constraints. |
| Shutdown Quiescent Current | 1 µA max - preserves battery life during MCU sleep modes with true output disconnect behavior. |
| Thermal Shutdown Threshold | +150 °C with 35 °C hysteresis - protects against sustained overload or poor PCB thermal design without latch-up. |
| Power Good Accuracy | 90% VOUT threshold, 3% hysteresis - provides reliable MCU reset or sequencing signal without external monitoring circuitry. |
Pinout & Package
Package: 8-lead MSOP with exposed thermal pad (EP), RoHS-compliant, moisture sensitivity level 1. 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 = 75% VIN - ensures robust turn-on even with weak pull-ups or noisy battery sources. |
| 2 NC | No connect | Unbonded pad; must remain floating - no routing or copper connection permitted per Microchip layout guidelines. |
| 3 PG | Open-drain power-good output | Sinks ≥5 mA when VOUT drops below 90% regulation - interfaces directly to MCU GPIO with external pull-up to VOUT or system rail. |
| 4 VOUT | Regulated output node | Connects to output capacitor and FB divider top resistor - carries full load current and requires low-ESR ceramic decoupling. |
| 5 SW | Switch node | High dv/dt node connecting inductor to internal N- and P-channel switches - demands tight layout, minimal trace length, and guard ring grounding. |
| 6 PGND | Power ground return | High-current return path for N-channel switch - must be tied to SGND externally and connected to thermal pad for optimal thermal performance. |
| 7 SGND | Signal ground reference | Low-noise reference for error amplifier and VFB comparator - routed separately from PGND until single-point star connection at input capacitor. |
| 8 VIN | Input supply | Accepts 0.35–5.5 V; requires ≥4.7 µF local ceramic bypass - powers startup circuitry before VOUT rises above VIN. |
Key Features
| Feature | Design Value |
|---|---|
| True output disconnect shutdown | Removes DC path between VIN and VOUT during EN = low - prevents battery drain and output discharge in standby, critical for medical sensors and wireless nodes. |
| Low-noise anti-ringing control | Damps SW node oscillations in discontinuous conduction mode - eliminates radiated EMI without external snubbers, easing EMC compliance in handheld instruments. |
| Internal synchronous rectification | Integrates both N- and P-channel MOSFETs - eliminates external Schottky losses, enabling >96% efficiency at medium loads without thermal derating. |
| Adjustable output via resistor divider | Supports 1.8–5.5 V with 1.21 V reference - allows single BOM to serve multiple voltage rails (e.g., 3.3 V for MCU, 5.0 V for USB peripheral) with high accuracy. |
| Fixed-frequency PWM with pulse-skipping | 1 MHz base frequency + light-load skipping - maintains low output ripple during active operation while improving light-load efficiency over pure PWM. |
Applications
| Portable Medical Sensors | PIC® MCU Power Supply |
|---|---|
Use Scenario: Continuous glucose monitor powered by single alkaline AA cell with 1.2–1.6 V nominal range. IC Role / Device Role / Timing Role: Step-up regulator generating stable 3.3 V for sensor ADC, BLE radio, and microcontroller core. Use Value: 0.65 V start-up enables operation down to end-of-life battery voltage; 1 µA shutdown current extends runtime beyond 6 months. |
Use Scenario: Low-power PIC16F178x-based environmental logger operating on two NiMH cells (2.4 V fully charged). IC Role / Device Role / Timing Role: Primary 3.3 V rail generator with PG signal used to wake MCU from deep sleep upon valid VOUT. Use Value: True output disconnect prevents backfeed into depleted cells; internal compensation reduces BOM count by 3 passive components. |
| USB Emergency Backup Charger | GPS Receiver Power |
Use Scenario: Hand-cranked or solar-charged power bank using three alkaline cells to deliver 5.0 V USB output. IC Role / Device Role / Timing Role: Adjustable boost stage set to 5.0 V with soft-start to avoid inrush into USB port capacitors. Use Value: 1.8 A peak switch current supports ≥1 A USB load at 3.3 V input; 1 MHz switching minimizes inductor size for pocket-sized form factor. |
Use Scenario: High-sensitivity GPS module in asset tracker powered by single Li-Ion cell (3.0–4.2 V). IC Role / Device Role / Timing Role: Generates clean 3.3 V supply with low noise and tight regulation to maintain GNSS lock during RF bursts. Use Value: Anti-ringing control suppresses SW node ringing that would otherwise couple into GPS L1 band; PG signal confirms valid rail before RF activation. |
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 | Lower start-up voltage (0.3 V), but fixed 3.3 V/5.0 V outputs only; no adjustable option; 0.95 MHz switching. | Lacks true output disconnect - uses input-to-output bypass in shutdown, causing VOUT to track VIN. | Select when lowest possible start-up voltage is critical and output voltage is fixed; avoid when output isolation during sleep is required. |
| MAX17065ETA+ | Higher peak current (2.5 A), wider input range (0.5–5.5 V), but requires external compensation and has no PG output. | No integrated power-good signal - necessitates external supervisor IC for MCU sequencing. | Select for higher output current demand (>1 A at 5 V) and where board area permits external compensation network. |
Compared with TPS61200DRCT and MAX17065ETA+, the MCP1642BT-ADJI/MS uniquely combines adjustable output, true output disconnect, integrated PG, and internal compensation in an MSOP-8 package - simplifying design for battery-powered microcontroller systems requiring flexible rail generation and ultra-low standby leakage.
Availability
MCP1642BT-ADJI/MS is available at Aetrix Electronics and suitable for portable medical sensors, PIC® MCU power supplies, USB emergency backup chargers, GPS receivers, and wireless sensor nodes requiring stable component supply across extended production lifecycles.
Supply support for MCP1642BT-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 microcontrollers, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with vertically integrated silicon and software tools.
The MCP1642B/D product line delivers ultra-low-voltage synchronous boost conversion for single- and multi-cell battery systems, emphasizing minimal start-up voltage, high light-load efficiency, and seamless integration with Microchip's PIC® and AVR® microcontrollers.
FAQ
What is the minimum input voltage required for the MCP1642BT-ADJI/MS to start regulating 3.3 V output?
The MCP1642BT-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 enables operation from nearly depleted alkaline or lithium primary cells. The device uses an open-loop pre-charge phase via the internal P-channel switch before transitioning to closed-loop PWM regulation. Performance is verified per DS20005253A-page 3, Table 1-1.
Does the MCP1642BT-ADJI/MS support adjustable output voltage, and how is it configured?
Yes, the MCP1642BT-ADJI/MS is the adjustable version of the MCP1642B family 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 Equation 5-1 in DS20005253A-page 17 defines RTOP/RBOT selection. High-value resistors (e.g., 1 MΩ range) are recommended to minimize divider current and preserve light-load efficiency.
What shutdown behavior does the MCP1642BT-ADJI/MS exhibit, and how does it differ from bypass-mode variants?
The MCP1642BT-ADJI/MS implements true output disconnect shutdown: when EN is pulled low, both internal switches turn off, eliminating the DC path between VIN and VOUT. This prevents battery drain and output discharge - unlike MCP1642D variants, which connect VIN to VOUT in shutdown. This behavior is confirmed in Section 4.1.1 and Table 4-1 of DS20005253A.
Can the MCP1642BT-ADJI/MS drive a 500 mA load at 5.0 V output from a 3.3 V input?
Yes - the MCP1642BT-ADJI/MS delivers >800 mA at 5.0 V output when VIN ≥3.3 V, as specified in the "1.8A Typical Peak Input Current Limit" feature list on DS20005253A-page 1. This capability assumes proper layout, 4.7 µH inductor, and 4.7–10 µF input/output capacitance. Efficiency exceeds 90% under these conditions, per Figure 2-6.
Is the exposed thermal pad (EP) electrically connected internally in the MCP1642BT-ADJI/MS MSOP package?
No - the exposed thermal pad (EP) in the MCP1642BT-ADJI/MS MSOP-8 package has no internal electrical connection to SGND or PGND. As stated in Section 3.9 and Table 3-1 of DS20005253A-page 11, EP must be externally connected to the same ground potential as PGND and SGND on the PCB for thermal dissipation and EMI control. Failure to solder EP degrades θJA by >100 °C/W.
MCP1642BT-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
MCP1642BT-ADJI/MS FAQ
1.How can I place an order for MCP1642BT-ADJI/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1642BT-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 MCP1642BT-ADJI/MS reliable?
The price and inventory of MCP1642BT-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 MCP1642BT-ADJI/MS is usually 5 days.
3.What payment methods are accepted for MCP1642BT-ADJI/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1642BT-ADJI/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1642BT-ADJI/MS?
MCP1642BT-ADJI/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1642BT-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 MCP1642BT-ADJI/MS?
For technical support, including MCP1642BT-ADJI/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1642BT-ADJI/MS requirements.
6.How does Aetrix verify that MCP1642BT-ADJI/MS is sourced from the original manufacturer or authorized distributors?
All MCP1642BT-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 MCP1642BT-ADJI/MS meets industry standards.
7.What is the process for return or replacement of MCP1642BT-ADJI/MS?
All MCP1642BT-ADJI/MS units undergo pre-shipment inspection (PSI). If there is an issue with MCP1642BT-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 MCP1642BT-ADJI/MS part is unused and in its original packaging.
Return procedure for MCP1642BT-ADJI/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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