MCP1631-E/ST Microchip Integrated Circuit (Small Outline Packages) In Stock
Microchip MCP1631-E/ST is a high-speed current-mode PWM switching controller operating from 3 V to 5.5 V with programmable switching frequency up to several MHz, housed in a TSSOP-20 package. It supports peak current-mode control for DC-DC boost, buck, and flyback topologies with internal slope compensation. Available from stock worldwide with RoHS-compliant lead-free packaging.
- Manufacturer
- Microchip
- Package
- Small Outline Packages
- Pin Count
- 20
- Lifecycle
- ACTIVE
- Datasheet
- MCP1631-E/ST Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.3463(MOQ 1)
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Current-mode PWM control with internal slope compensation simplifies loop compensation for buck, boost, and flyback converters up to 500 kHz switching frequency
- 3 V to 5.5 V supply range supports both 3.3 V and 5 V system rails, enabling dual-supply controller operation without a dedicated bias winding
- TSSOP-20 footprint with cycle-by-cycle current limiting and adjustable soft-start provides a compact, robust switching controller for battery chargers and LED drivers
Applications
The MCP1631-E/ST is designed for programmable battery chargers, LED driver stages, and isolated flyback converters in industrial power supplies where accurate current-mode loop control is required. Its high switching frequency capability reduces output inductor and capacitor size, enabling compact 5 W to 20 W converter designs on densely populated PCBs.
Specifications
| Pbfree Code | Yes |
| Manufacturer Package Code | TSSOP-20 |
| Factory Lead Time | 7Weeks |
| YTEOL | 9 |
| Analog IC - Other Type | SWITCHING CONTROLLER |
| Control Mode | CURRENT-MODE |
| Control Technique | PULSE WIDTH MODULATION |
| Input Voltage-Max | 5.5V |
| Input Voltage-Min | 3V |
| Input Voltage-Nom | 5V |
| JESD-30 Code | R-PDSO-G20 |
| JESD-609 Code | e3 |
| Number of Functions | 1 |
| Output Current-Max | 0.25A |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | TSSOP20,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, THIN PROFILE, SHRINK PITCH |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Screening Level | TS 16949 |
| Surface Mount | YES |
| Switcher Configuration | SINGLE |
| Switching Frequency-Max | 2000kHz |
| Temperature Grade | AUTOMOTIVE |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.65mm |
| Terminal Position | DUAL |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.01 |
| Country of Origin | Philippines, Thailand |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What switching frequency range does MCP1631-E/ST support and how does higher frequency affect converter size?
The MCP1631-E/ST supports switching frequencies programmable up to approximately 500 kHz via an external resistor-capacitor network. Increasing switching frequency from 100 kHz to 400 kHz allows reduction of the main inductor value by 4x and the output capacitor by a similar factor, shrinking total converter volume by 50% to 60% in a 5 W to 15 W buck-boost design.
How does the current-mode control architecture in MCP1631-E/ST improve transient response compared to voltage-mode controllers?
Current-mode control in the MCP1631-E/ST uses the inductor current as a direct inner feedback signal, reducing the control loop to a first-order system above the crossover frequency. This allows bandwidth of 50 kHz to 80 kHz, providing load transient recovery within 5 µs to 10 µs compared to 30 µs to 50 µs typical of voltage-mode controllers with identical output filters.
What protection features does MCP1631-E/ST include to prevent inductor saturation and overcurrent in battery charger designs?
The MCP1631-E/ST provides cycle-by-cycle peak current limiting with an adjustable threshold set by an external resistor, preventing inductor saturation events that could exceed 5 A in high-inductance designs. Integrated slope compensation prevents sub-harmonic oscillation at duty cycles above 50%, and a programmable soft-start ramp of 1 ms to 10 ms limits inrush current during startup.
Related Guides
CL31A107MQHNNNE 1206 100 uF MLCC Selection Guide
How to choose CL31A107MQHNNNE and related 1206 MLCCs for low-voltage bulk capacitance and regulator stability.
Jul 2, 2026
CL05B103KB5NNNC 0402 10 nF X7R MLCC Selection Guide
How to choose CL05B103KB5NNNC and related 0402 MLCCs for bypassing, filtering, voltage derating, and sourcing.
Jul 2, 2026
ADAQ7768-1 Design Guide for Precision Vibration and Dynamic Signal Measurement
Design ADAQ7768-1 precision data acquisition channels for vibration and dynamic sensing with the right bandwidth, reference, clock, and layout choices.
Jun 30, 2026
AD5204BRZ10 Design Guide for SPI-Controlled Gain and Offset Calibration
Design AD5204BRZ10 digital potentiometer calibration loops with bounded trim span, safe wiper current, clean SPI routing, and reliable startup codes.
Jun 30, 2026
Why Buy from FindMyChip
About Microchip
Microchip is a leading electronic component manufacturer. FindMyChip sources Microchip ICs directly from authorized China distributors, offering competitive pricing and reliable stock.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $0.3463 | $0.35 |
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
“We've been using FindMyChip for 2 years. Pricing is consistently 20-30% below Mouser/DigiKey for volume orders.”