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Microchip Technology MCP1642BT-33I/MS
- Part No.:
- MCP1642BT-33I/MS
- Manufacturer:
- Microchip Technology
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MCP1642BT-33I/MS.pdf
- Description:
- IC REG BOOST 3.3V 800MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,701
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Product details
Overview
MCP1642BT-33I/MS from Microchip Technology is a synchronous step-up DC-DC converter optimized for low-voltage battery-powered systems. It delivers a fixed 3.3V output from input voltages as low as 0.35V (typical), supports up to 800 mA output current at 3.3V with 3.3V input, operates at 1 MHz PWM frequency with internal compensation, and features true output disconnect during shutdown. It is used in PIC® MCU power supplies and single-cell Li-Ion to 3.3V conversion.
For engineers reviewing the MCP1642BT-33I/MS datasheet, MCP1642BT-33I/MS pinout, MCP1642BT-33I/MS application, or MCP1642BT-33I/MS equivalent, key selection criteria include start-up voltage (0.65V typ. for 3.3V VOUT), shutdown current (<1 µA), integrated synchronous rectification, Power Good open-drain output, and MSOP-8 package compatibility with space-constrained portable designs.
Technical Context
The MCP1642BT-33I/MS implements peak-current-mode PWM control with adaptive slope compensation, fixed 1 MHz switching, and lossless current sensing. Its architecture integrates an N-channel boost switch (RDS(ON) = 0.15 Ω) and P-channel synchronous rectifier (RDS(ON) = 0.3 Ω), enabling high efficiency (up to 96%) across wide input ranges without external compensation.
It uses low-voltage start-up logic that charges the output capacitor via the P-channel switch before initiating closed-loop regulation, then ramps the current limit from 50% to full 1.8A typical during soft-start. The true output disconnect mode (MCP1642B variant) eliminates DC path between VIN and VOUT when EN is low, preventing battery drain and output discharge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3%, internally regulated - no external feedback resistors required. |
| Input Voltage Range | 0.35V to 5.0V (min operating); 0.65V typical start-up for 3.3V output - enables operation from deeply discharged alkaline or single-cell Li-Ion. |
| Switching Frequency | 1.0 MHz ±15% - enables use of small 4.7 µH inductors and compact 4.7–10 µF ceramic output capacitors. |
| Peak Switch Current Limit | 1.8A typical - determines maximum deliverable output current (e.g., >600 mA at 2.4VIN/3.3VOUT). |
| Shutdown Current | 1 µA max - ensures negligible battery drain in standby, critical for long-life portable medical and sensor devices. |
| Power Good Output | Open-drain, active-low at 90% of VOUT with 3% hysteresis - provides reliable MCU reset or sequencing signal without external comparator. |
| Operating Temperature | –40°C to +85°C ambient - qualified for industrial and automotive cabin-temperature applications. |
Pinout & Package
Package: 8-Lead MSOP (3.0 mm × 4.9 mm, 0.65 mm pitch), with exposed thermal pad (EP) not electrically connected - requires PCB thermal pad connection to SGND/PGND plane for optimal thermal performance (θJA = 211°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | Enable input | Logic-controlled shutdown: >75% VIN = enable; <20% VIN = disable - supports dynamic power gating by MCU GPIO. |
| 2 NC | No connect | Unbonded pin - must be left floating or tied to GND; no internal connection per datasheet Table 3-1. |
| 3 PG | Power Good open-drain | Signals VOUT ≥90% of regulation; requires external pull-up to VOUT or system rail - enables safe MCU wake-up or load enable. |
| 4 VOUT | Regulated output | 3.3V output node; connects to output capacitor and load - carries full output current and high-frequency ripple. |
| 5 SW | Switch node | Connects boost inductor; carries pulsed 1.8A peak current and high dv/dt - requires short, low-inductance layout to minimize EMI. |
| 6 PGND | Power ground | High-current return for N-channel switch - must be connected externally to SGND and thermal pad for low-impedance path. |
| 7 SGND | Signal ground | Reference for error amplifier and VFB comparator - must tie to PGND at single point near IC to avoid noise coupling. |
| 8 VIN | Input supply | Accepts 0.35–5.0V; requires local 4.7 µF ceramic bypass capacitor - low-ESR cap essential for stable start-up and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| True output disconnect | MCP1642B variant isolates VOUT from VIN during shutdown - prevents battery drain and maintains output hold-up capacitance. |
| Low-noise anti-ringing control | Integrated damping circuit suppresses high-frequency oscillations at SW node - reduces radiated EMI without snubbers. |
| Internal synchronous rectification | Eliminates external Schottky diode - improves efficiency by ~8–12% vs. asynchronous designs, especially at light loads. |
| Internal compensation | Full Type II compensation network embedded - removes need for external RC network, reducing BOM count and layout sensitivity. |
| Inrush current limiting & soft-start | 550 µs typical soft-start time with controlled current ramp - prevents input voltage sag and output overshoot during power-up. |
Applications
| PIC® MCU Power Supply | USB Emergency Backup Charger |
|---|---|
Use Scenario: Powering 3.3V PIC microcontrollers from single-cell alkaline or Li-Ion batteries in handheld instruments. IC Role / Device Role / Timing Role: Primary 3.3V regulated supply; replaces linear regulators to extend battery life under variable load. Use Value: Enables operation down to 0.35V input, supporting full battery discharge; 96% efficiency minimizes heat in sealed enclosures. |
Use Scenario: Portable USB power bank using AA/AAA batteries to deliver 5V USB output via secondary boost stage. IC Role / Device Role / Timing Role: First-stage 3.3V intermediate rail generator feeding a second 3.3V→5V boost converter. Use Value: Low 0.65V start-up allows charging even with weak batteries; true disconnect prevents self-discharge when idle. |
| Wireless Sensor Node | GPS Receiver Power |
Use Scenario: Ultra-low-power IoT sensor node powered by coin cell or two alkaline cells, requiring regulated 3.3V for RF transceiver and MCU. IC Role / Device Role / Timing Role: Main system power regulator with programmable enable for duty-cycled operation. Use Value: 1 µA shutdown current extends shelf life; Power Good signal synchronizes wake-up with stable VOUT. |
Use Scenario: GPS module in asset tracker or wearable device, where input voltage drops from 3.0V to 0.9V during battery depletion. IC Role / Device Role / Timing Role: Constant 3.3V supply for GPS baseband and RF front-end despite falling battery voltage. Use Value: Maintains lock and position accuracy down to 0.35V input; 1 MHz switching avoids interference with GPS L1 band (1.575 GHz). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Texas Instruments TPS61200DRCT | Fixed 3.3V output; 0.3V min start-up; 1.2A switch; no true disconnect - uses diode-based bypass in shutdown. | Lacks true output isolation; higher quiescent current (1.2 µA) and lower efficiency below 1V input. | Prefer MCP1642BT-33I/MS when battery life and output hold-up are critical; TPS61200DRCT suits cost-sensitive designs with less stringent shutdown leakage. |
| Analog Devices ADP5070ACPZ-R7 | Adjustable output only; 2.85V min start-up; dual-output capability; requires external compensation. | Cannot replace fixed 3.3V function without resistor divider; unsuitable for sub-1V battery inputs. | Only consider ADP5070ACPZ-R7 if adjustable output or dual-rail generation is needed; MCP1642BT-33I/MS offers plug-and-play 3.3V with superior low-VIN performance. |
Compared with TPS61200DRCT and ADP5070ACPZ-R7, the MCP1642BT-33I/MS uniquely combines ultra-low start-up voltage (0.65V), true output disconnect, fixed 3.3V output, and internal compensation - making it the optimal choice for space- and battery-limited portable systems requiring guaranteed 3.3V regulation across full battery discharge.
Availability
MCP1642BT-33I/MS is available at Aetrix Electronics and suitable for wireless sensors, handheld medical devices, and PIC® MCU-based instrumentation requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for MCP1642BT-33I/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 mixed-signal semiconductors, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The MCP1642B/D family was designed specifically for ultra-low-voltage, high-efficiency boost conversion in battery-powered portable electronics - emphasizing minimal external components, robust start-up behavior, and seamless integration with Microchip's PIC® MCU ecosystem.
FAQ
What is the minimum input voltage required for MCP1642BT-33I/MS to start regulating 3.3V output?
The MCP1642BT-33I/MS has a typical start-up voltage of 0.65V for 3.3V output with 1 mA load, and can operate continuously down to 0.35V input. This enables reliable power-up from nearly depleted alkaline or single-cell Li-Ion batteries. The device uses internal start-up logic to pre-charge the output capacitor before entering closed-loop regulation.
Does MCP1642BT-33I/MS require external feedback resistors to set its 3.3V output?
No. The MCP1642BT-33I/MS is a fixed-output variant (suffix "-33") with an internal feedback divider - pin 2 (VFB) is unconnected (NC). Unlike the ADJ version, it needs no external resistors, reducing BOM count and eliminating resistor tolerance effects on output accuracy (±3% over temperature).
How does the true output disconnect feature of MCP1642BT-33I/MS benefit battery-powered systems?
The true output disconnect feature (enabled by the MCP1642B variant designation) turns off both internal MOSFETs when EN is low, eliminating the DC path between VIN and VOUT. This prevents battery drain through load leakage and preserves output capacitor charge - extending shelf life and enabling fast wake-up without recharging the output rail.
What is the purpose of the exposed thermal pad (EP) on the MCP1642BT-33I/MS MSOP package?
The exposed thermal pad (EP) on the MCP1642BT-33I/MS MSOP package is not electrically connected but must be soldered to a PCB copper pour tied to SGND/PGND. It reduces thermal resistance (θJA = 211°C/W) and improves power dissipation - critical for sustaining 800 mA output at high ambient temperatures or high duty cycles.
Can MCP1642BT-33I/MS drive a 500 mA load at 3.3V output when powered from 1.5V input?
No. At 1.5V input and 3.3V output, the MCP1642BT-33I/MS delivers >300 mA (per datasheet DC characteristics), not 500 mA. Maximum output current scales with input voltage: it supports >600 mA at 2.4VIN, >800 mA at 3.3VIN, and ≥1A above 3.6VIN. For 500 mA at 1.5VIN, a higher-efficiency topology or larger inductor may be required.
MCP1642BT-33I/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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 0.65V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- 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-33I/MS FAQ
1.How can I place an order for MCP1642BT-33I/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1642BT-33I/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-33I/MS reliable?
The price and inventory of MCP1642BT-33I/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-33I/MS is usually 5 days.
3.What payment methods are accepted for MCP1642BT-33I/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1642BT-33I/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1642BT-33I/MS?
MCP1642BT-33I/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1642BT-33I/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-33I/MS?
For technical support, including MCP1642BT-33I/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1642BT-33I/MS requirements.
6.How does Aetrix verify that MCP1642BT-33I/MS is sourced from the original manufacturer or authorized distributors?
All MCP1642BT-33I/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-33I/MS meets industry standards.
7.What is the process for return or replacement of MCP1642BT-33I/MS?
All MCP1642BT-33I/MS units undergo pre-shipment inspection (PSI). If there is an issue with MCP1642BT-33I/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-33I/MS part is unused and in its original packaging.
Return procedure for MCP1642BT-33I/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MCP1642BT-33I/MS Tags
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