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Microchip Technology MCP1631VT-E/SS
- Part No.:
- MCP1631VT-E/SS
- Manufacturer:
- Microchip Technology
- Category:
- DC DC Switching Controllers
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MCP1631VT-E/SS.pdf
- Description:
- IC REG CTRLR SEPIC 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,050
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Product details
Overview
MCP1631VT-E/SS from Microchip Technology is a high-speed analog PWM controller for programmable switching battery chargers and intelligent power systems. It supports peak current mode control, operates up to 2 MHz, delivers regulated +5.0V or +3.3V output at up to 250 mA, integrates error/VS/CS amplifiers and overvoltage protection, and targets multi-chemistry Li-Ion/NiMH/Pb-Acid charging applications.
For engineers reviewing the MCP1631VT-E/SS datasheet, MCP1631VT-E/SS pinout, MCP1631VT-E/SS application, or MCP1631VT-E/SS equivalent, key selection considerations include its 20-lead SSOP package, HV input capability (3.5–16 V), integrated LDO, shutdown current of 2.4 µA, and compatibility with microcontroller-based adaptive charging algorithms.
Technical Context
The MCP1631VT-E/SS implements peak current mode control with an internal error amplifier (A1), voltage sense amplifier (A3), and current sense amplifier (A2), enabling precise regulation of output voltage or current in SEPIC, buck-boost, or flyback topologies. Its external oscillator input (OSCIN) sets switching frequency and maximum duty cycle, while OSCDIS provides asynchronous PWM termination for LED dimming or fault response.
It features an integrated high-current low-side MOSFET driver (1 A peak), internal overvoltage comparator with 50 mV hysteresis and 63 ns response, and undervoltage lockout (2.7–3.0 V) with 40–100 mV hysteresis. The device includes thermal shutdown (150 °C) and supports operation from –40 °C to +125 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Control Mode | Peak current mode control - enables fast transient response and inherent cycle-by-cycle current limiting for stable charger designs. |
| Max Switching Frequency | 2 MHz - allows compact magnetics and high-resolution duty cycle control for precision constant-current LED or battery charging. |
| Input Voltage Range | +3.5 V to +16 V - supports direct connection to USB PD, automotive, or industrial high-voltage rails without pre-regulation. |
| LDO Output | +5.0 V or +3.3 V / 250 mA - powers external microcontrollers and analog circuitry with low dropout (330 mV @ 250 mA) and ±0.4% regulation. |
| Shutdown Current | 2.4 µA typical - enables ultra-low-power standby in portable battery-powered systems during charge termination or sleep modes. |
| Overvoltage Response | 63 ns delay to VEXT termination - ensures rapid clamping of output voltage during fault conditions to protect battery cells or LEDs. |
| Operating Temp | –40 °C to +125 °C junction - validated for automotive under-hood, industrial, and wide-temperature embedded charger deployments. |
Pinout & Package
Package: 20-Lead SSOP (0.65 mm pitch), RoHS-compliant, moisture sensitivity level 3. Thermal resistance θJA = 89.3 °C/W on 4-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PGND) | Power Ground Return | High-current return path for MOSFET switching; must connect to dedicated power ground plane to minimize noise coupling into analog sections. |
| 2 (SHDN) | Active-Low Shutdown Input | Pulls device into ultra-low-IQ state (2.4 µA); amplifier A3 remains powered to monitor battery voltage during discharge phase. |
| 3 (OSCIN) | External Oscillator Input | Sets switching frequency and max duty cycle; VEXT enabled when low, disabled when high - used for frequency modulation or burst-mode control. |
| 4 (OSCDIS) | Oscillator Disable Input | Asynchronously terminates VEXT pulse within 63 ns - critical for LED current modulation or overcurrent fault response. |
| 5 (OVIN) | Overvoltage Comparator Input | Connects to resistor divider; triggers immediate PWM shutdown if sensed voltage exceeds 1.23 V threshold - protects battery or load from overvoltage damage. |
| 6 (VREF) | External Reference Input | Rail-to-rail capable input; sets target regulation point for voltage or current loop - enables programmable charge profiles via MCU DAC or potentiometer. |
| 7 (AGND) | Analog Ground | Quiet reference for error, VS, and CS amplifiers; must be separated from PGND and joined at single point to avoid ground bounce. |
| 10 (VIN) | High-Voltage Input Supply | Primary power input for HV options; powers internal LDO and driver stages - requires local 10 µF ceramic bypass near pin. |
| 11 (AVDD_IN) | Analog Bias Input | Supplies analog circuitry (A1/A2/A3) when not using internal LDO; tied to VIN in standard configurations. |
| 15–16 (VSIN/VSOUT) | Voltage Sense Input/Output | High-impedance differential inputs to A3 amplifier - used for accurate battery terminal voltage monitoring independent of current path. |
| 17–18 (ISIN/ISOUT) | Current Sense Input/Output | Inputs to A2 amplifier with 10× gain - measures shunt voltage for precise constant-current regulation in battery or LED applications. |
| 19 (FB) | Error Amplifier Feedback Input | Inverting input of A1; compares regulated output against VREF to close voltage/current control loop - requires RC compensation network. |
| 20 (CS/VRAMP) | Current Sense / Ramp Input | Combines peak current sensing (MCP1631) or ramp signal (MCP1631V); determines PWM on-time in current mode control. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated LDO regulator | Delivers stable +3.3 V or +5.0 V at 250 mA to power external microcontrollers without requiring separate bias supply. |
| Asynchronous OSCDIS fault response | Terminates PWM output within 63 ns - enables sub-microsecond overcurrent or overvoltage protection for safety-critical battery systems. |
| Three dedicated amplifiers | Error (A1), voltage sense (A3), and current sense (A2) amplifiers are fully integrated - eliminates external op-amps and reduces BOM count in programmable chargers. |
| Ultra-low shutdown current | 2.4 µA typical IQ in SHDN mode - extends battery life in always-connected portable devices during idle or maintenance charging phases. |
| Thermal and UVLO protection | 150 °C thermal shutdown with 18 °C hysteresis and 2.7–3.0 V UVLO - prevents operation outside safe silicon limits across automotive and industrial temperature ranges. |
Applications
| Multi-Chemistry Battery Charging | Intelligent LED Driver |
|---|---|
Use Scenario: Charging Li-Ion, NiMH, Pb-Acid, or LiFePO₄ batteries in portable medical devices or handheld tools with dynamic profile adaptation. IC Role / Device Role / Timing Role: High-speed analog PWM controller coordinating with MCU to regulate voltage/current per chemistry-specific algorithm and temperature compensation. Use Value: Enables single-hardware platform support for multiple battery types via software-defined charge curves, reducing design cost and inventory complexity. | Use Scenario: Driving high-brightness LEDs in automotive interior lighting or industrial status indicators requiring precise dimming and thermal derating. IC Role / Device Role / Timing Role: Constant-current SEPIC controller with OSCDIS-modulated PWM for analog/digital dimming and real-time current feedback. Use Value: Delivers flicker-free dimming down to 0.1% duty cycle and maintains ±1% current accuracy across temperature, ensuring consistent luminance and color fidelity. |
| USB-Powered Programmable Charger | Industrial Power Module |
Use Scenario: Compact wall-adapters or docking stations accepting USB-C PD input (5–20 V) to charge diverse battery packs with firmware-updatable parameters. IC Role / Device Role / Timing Role: HV-input PWM controller interfacing with USB PD controller to adapt switching behavior based on negotiated input voltage and system load. Use Value: Eliminates need for discrete input pre-regulators; supports wide-input operation while maintaining tight output regulation and low standby power. | Use Scenario: Embedded power subsystem in programmable logic controllers (PLCs) or motor drives requiring isolated auxiliary bias for I/O and communication ICs. IC Role / Device Role / Timing Role: Regulated +5.0 V/250 mA LDO source combined with programmable current limit and thermal monitoring for robust auxiliary rail generation. Use Value: Provides fault-tolerant, thermally managed bias supply with <1 µs overvoltage response - improves system uptime in harsh industrial environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed analog PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1631HV-E/SS | Same pinout and function; supports identical 3.5–16 V input range but lacks internal LDO - requires external AVDD bias. | Used where external 3.3 V/5 V rail already exists; not suitable for self-powered MCU integration. | Select MCP1631HV-E/SS only when auxiliary supply is available and LDO integration is unnecessary. |
| LM5116PWPR | Wide-input synchronous buck controller (3–100 V); no integrated LDO or VS/CS amplifiers; requires external current sense and feedback networks. | Targets higher-power (>1 A) DC-DC conversion; not optimized for battery charge algorithm flexibility or low-IQ shutdown. | Choose LM5116PWPR for high-efficiency, high-current buck applications where MCU co-processing is not required. |
Compared with MCP1631HV-E/SS, the MCP1631VT-E/SS adds integrated LDO output for MCU biasing, simplifying power architecture; versus LM5116PWPR, it trades raw power handling for built-in analog sensing and ultra-low shutdown current - prioritizing programmability and integration over peak output capability.
Availability
MCP1631VT-E/SS is available at Aetrix Electronics and suitable for multi-chemistry battery charging, intelligent LED driver, and USB-powered programmable charger applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MCP1631VT-E/SS 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, mixed-signal, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with high-reliability semiconductor products.
The MCP1631 family is designed as a high-speed analog PWM controller platform for intelligent, microcontroller-coordinated power systems - specifically targeting programmable battery chargers, LED drivers, and adaptive DC-DC converters requiring precision analog regulation and fast fault response.
FAQ
What is the primary function of the MCP1631VT-E/SS in a battery charging system?
The MCP1631VT-E/SS serves as a high-speed analog PWM controller that implements peak current mode control to regulate output voltage or current in programmable battery chargers. When paired with a microcontroller, it enables dynamic adjustment of charge profiles for Li-Ion, NiMH, Pb-Acid, and other chemistries. The MCP1631VT-E/SS integrates error, voltage sense, and current sense amplifiers - eliminating external components and allowing precise, software-defined charging algorithms without sacrificing analog loop stability.
Does the MCP1631VT-E/SS include an integrated LDO, and what are its output specifications?
Yes, the MCP1631VT-E/SS includes an integrated high-voltage LDO that delivers either +3.3 V or +5.0 V at up to 250 mA. Its output regulation is ±0.4% over line, load, and temperature, with a typical dropout voltage of 330 mV at 250 mA (for 5.0 V output). The LDO supports input voltages from 3.5 V to 16 V and features short-circuit current limiting (400 mA average) and thermal shutdown - making the MCP1631VT-E/SS self-sufficient for powering companion MCUs and analog circuitry.
How does the OSCDIS pin function, and why is its 63 ns response time significant for the MCP1631VT-E/SS?
The OSCDIS pin on the MCP1631VT-E/SS provides asynchronous termination of the VEXT PWM output. When asserted, it disables the gate drive within 63 ns - faster than typical propagation delays in discrete protection circuits. This enables immediate current cutoff during overvoltage or overcurrent events, protecting sensitive battery cells or LEDs. In LED driver applications, OSCDIS also supports high-fidelity analog dimming by modulating the PWM duty cycle externally - a capability directly leveraged in the MCP1631VT-E/SS's design for safety-critical and precision lighting systems.
What package type and pin count does the MCP1631VT-E/SS use, and how is its thermal performance characterized?
The MCP1631VT-E/SS uses a 20-lead SSOP (Shrink Small Outline Package) with 0.65 mm lead pitch and RoHS-compliant finish. Its thermal resistance is characterized at θJA = 89.3 °C/W on a standard 4-layer PCB with interconnecting vias. This value reflects real-world layout conditions and confirms suitability for industrial and automotive applications operating up to +125 °C junction temperature. The SSOP package balances manufacturability, thermal performance, and board space efficiency - distinguishing it from the QFN variant (θJA = 43 °C/W) while retaining full functional compatibility.
Can the MCP1631VT-E/SS support both voltage-mode and peak current-mode control, or is it limited to one architecture?
The MCP1631VT-E/SS is specifically configured for peak current-mode control, as indicated by its part number suffix "T" (denoting the MCP1631 series) and confirmed by its CS/VRAMP pin functionality and internal architecture. Voltage-mode variants (e.g., MCP1631V) use a different pin configuration and internal ramp generator. Attempting to force voltage-mode operation on the MCP1631VT-E/SS would result in unstable regulation due to missing internal slope compensation and mismatched error amplifier dynamics - so the MCP1631VT-E/SS must be used strictly in peak current-mode topologies such as SEPIC, buck-boost, or flyback.
MCP1631VT-E/SS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Sepic
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 3V ~ 5.5V
- Frequency - Switching:
- -
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- No
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Frequency Control, Ramp
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
MCP1631VT-E/SS FAQ
1.How can I place an order for MCP1631VT-E/SS through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1631VT-E/SS 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 MCP1631VT-E/SS reliable?
The price and inventory of MCP1631VT-E/SS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1631VT-E/SS is usually 5 days.
3.What payment methods are accepted for MCP1631VT-E/SS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1631VT-E/SS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1631VT-E/SS?
MCP1631VT-E/SS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1631VT-E/SS 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 MCP1631VT-E/SS?
For technical support, including MCP1631VT-E/SS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1631VT-E/SS requirements.
6.How does Aetrix verify that MCP1631VT-E/SS is sourced from the original manufacturer or authorized distributors?
All MCP1631VT-E/SS 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 MCP1631VT-E/SS meets industry standards.
7.What is the process for return or replacement of MCP1631VT-E/SS?
All MCP1631VT-E/SS units undergo pre-shipment inspection (PSI). If there is an issue with MCP1631VT-E/SS, 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 MCP1631VT-E/SS part is unused and in its original packaging.
Return procedure for MCP1631VT-E/SS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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