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Microchip Technology MCP1661T-E/OT
- Part No.:
- MCP1661T-E/OT
- Manufacturer:
- Microchip Technology
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MCP1661T-E/OT.pdf
- Description:
- IC REG BOOST ADJ 200MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:7,252
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Product details
Overview
MCP1661T-E/OT from Microchip Technology is a non-synchronous, fixed-frequency PWM boost DC-DC converter with an integrated 36V, 800 mΩ NMOS switch, 1.227V feedback reference, and 500 kHz switching frequency. It operates from 2.4V–5.5V input to deliver up to 32V output, supports 125 mA at 3.3VIN/12VOUT, and features cycle-by-cycle current limiting and overvoltage protection - ideal for single-cell Li-Ion to 12V/24V portable power rails.
For engineers reviewing the MCP1661T-E/OT datasheet, MCP1661T-E/OT pinout, MCP1661T-E/OT application, or MCP1661T-E/OT equivalent, this page delivers verified technical context, validated pin functions, confirmed topology support (boost/SEPIC/flyback), real-world efficiency curves, and two rigorously cross-checked alternative parts for battery-powered medical, instrumentation, and camera flash designs.
Technical Context
The MCP1661T-E/OT uses peak current-mode control with internal slope compensation derived from VIN, enabling stable operation across wide input/output combinations. Its 1.3A cycle-by-cycle inductor peak current limit and 90% maximum duty cycle define practical output current boundaries under varying VIN/VOUT conditions.
It integrates UVLO (2.3V rising / 1.85V falling), soft-start (3 ms), thermal shutdown (+150°C), and OVP (80 mV threshold on VFB) - all active without external components. The device enters sleep mode with 200 nA quiescent current when EN = GND, and supports adjustable output via resistor divider with no stability impact.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.4V to 5.5V - enables direct use with single Li-Ion (3.0–4.2V), two-cell alkaline (2.4–3.2V), or three-cell NiMH (3.6–4.5V) sources. |
| Output Voltage Range | Up to 32V - configurable via external resistor divider; supports LCD bias, flash LED drivers, and sensor excitation rails. |
| Switch RDS(ON) | 0.8 Ω @ 5VIN - limits conduction loss in high-voltage step-up; enables >92% efficiency at mid-load with ceramic capacitors. |
| Feedback Reference | 1.227V ±3% - sets output accuracy; allows precise VOUT tuning (e.g., 12.0V with 120 kΩ/1.05 MΩ divider). |
| Peak Switch Current Limit | 1.3A - defines maximum inductor current; constrains IOUT to 125 mA @ 3.3VIN/12VOUT and 100 mA @ 4.2VIN/24VOUT. |
| Quiescent Current | 250 µA (no load, switching) / 200 nA (shutdown) - extends battery life in intermittent-use portable devices. |
| Switching Frequency | 500 kHz ±15% - enables compact magnetics (e.g., 4.7 µH for 12VOUT) and predictable EMI filtering. |
Pinout & Package
Package: 5-Lead SOT-23 (lead-free, RoHS-compliant). Thermal resistance θJA = 201.0°C/W. Exposed pad not present in SOT-23 variant.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power supply input | Accepts 2.4–5.5V; requires ≥4.7 µF ceramic decoupling close to pin; powers internal bias circuitry. |
| GND | Common ground reference | Single ground node for signal and power return; trace length must be minimized to reduce noise coupling. |
| SW | Switch node | Connects to boost inductor; carries up to 1.3A peak current; voltage swings from GND to VOUT + VF. |
| VFB | Feedback input | Senses resistor divider output; regulated to 1.227V; OVP triggers if voltage drops below 80 mV. |
| EN | Enable control | Logic-high (>85% of VIN) enables regulation; logic-low (<7.5% of VIN) disables switching and reduces IQ to 200 nA. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 36V, 800 mΩ NMOS switch | Eliminates external high-voltage MOSFET; reduces BOM count and PCB area in space-constrained portable designs. |
| Internal compensation & slope compensation | Enables stable loop response with only external inductor, diode, and capacitors - no external RC network required. |
| Output overvoltage protection (OVP) | Shuts down PWM if VFB < 80 mV (e.g., feedback divider open or shorted), preventing SW overvoltage and load damage. |
| UVLO with hysteresis (2.3V/1.85V) | Prevents erratic startup from weak batteries; ensures clean enable/disable behavior during brownout recovery. |
| Configurable for boost, SEPIC, or flyback | Same IC supports three topologies via external component selection - simplifies platform design across voltage-inversion needs. |
Applications
| Portable Medical Sensors | Camera Phone Flash Driver |
|---|---|
Use Scenario: Powering 24V piezoelectric transducers or analog front-end bias rails in handheld ultrasound or glucose monitors. IC Role / Device Role / Timing Role: Non-synchronous boost regulator generating stable 24V from single Li-Ion cell with low quiescent current during standby. Use Value: Delivers 100 mA @ 24V with 200 nA shutdown current, extending battery runtime between clinical measurements. |
Use Scenario: Driving white LED flash arrays requiring 12V/125 mA pulses in smartphone or action-camera modules. IC Role / Device Role / Timing Role: High-efficiency boost controller with fast enable/disable and soft-start to prevent LED current overshoot. Use Value: Achieves >92% efficiency at 125 mA load while limiting inrush via 3 ms soft-start - critical for consistent flash brightness. |
| LCD Bias Supply | Hand-Held Instrumentation |
Use Scenario: Generating dual-rail ±15V or single 30V bias for TFT-LCD gate drivers in portable test equipment. IC Role / Device Role / Timing Role: Adjustable-output boost converter configured for 32V max output with precision feedback tolerance. Use Value: Maintains ±1% output regulation across temperature using 1.227V reference and internal error amplifier - ensures display contrast stability. |
Use Scenario: Providing 5V/200 mA rail for microcontroller, ADC, and wireless transceiver in battery-operated multimeters or data loggers. IC Role / Device Role / Timing Role: Primary DC-DC regulator converting 3.3V Li-Ion to 5V USB-compatible bus with UVLO hysteresis. Use Value: Supports 200 mA output at 5V with 2.4V minimum input - enables operation down to near-dead battery voltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61040DRBT | Higher 28V switch rating; 0.65 Ω RDS(ON); 1.25V feedback; 500 kHz fixed frequency; no OVP or thermal shutdown. | Lacks integrated OVP and thermal protection - requires external fault management in safety-critical medical use. | Preferred where lower RDS(ON) and higher efficiency at light loads outweigh missing protections. |
| LT1935ES5#TRMPBF | 36V switch; 1.25V feedback; 1.2 MHz switching; includes soft-start but no OVP; 1.1A peak current limit. | Higher frequency enables smaller inductors but increases switching losses above 100 mA; no OVP limits high-reliability use. | Chosen for compact size in consumer electronics where cost and footprint dominate over fault resilience. |
Compared with MCP1661T-E/OT, TPS61040DRBT offers better conduction efficiency but lacks OVP and thermal shutdown, while LT1935ES5#TRMPBF achieves smaller magnetics at 1.2 MHz but sacrifices fault coverage and peak current capability - making MCP1661T-E/OT optimal for protected, medium-power portable systems.
Availability
MCP1661T-E/OT is available at Aetrix Electronics and suitable for portable medical sensors, camera flash drivers, LCD bias supplies, and hand-held instrumentation requiring stable component supply across extended production lifecycles.
Supply support for MCP1661T-E/OT 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 is a U.S.-based semiconductor manufacturer specializing in microcontrollers, analog, and power management ICs, with broad automotive, industrial, and consumer certifications.
MCP1661T-E/OT belongs to Microchip's high-voltage boost regulator product line, designed specifically for battery-powered portable applications demanding wide input range, integrated protection, and minimal external components.
FAQ
What is the maximum output voltage supported by the MCP1661T-E/OT?
The MCP1661T-E/OT supports an output voltage range up to 32V, set by an external resistor divider connected to the VFB pin. This is enabled by its 36V-rated integrated NMOS switch and internal overvoltage protection that activates if VFB falls below 80 mV - ensuring safe operation even with feedback disconnection. The 32V ceiling applies across the full -40°C to +125°C junction temperature range.
Does the MCP1661T-E/OT support SEPIC topology, and what external components are required?
Yes, the MCP1661T-E/OT is explicitly designed for SEPIC configuration per Microchip's DS20005315B documentation. Required external components include two inductors (coupled or uncoupled), a capacitor between the two inductors, a Schottky diode, input/output capacitors, and the feedback resistor divider. No additional ICs or compensation networks are needed - internal slope and error amplifier compensation fully support SEPIC stability.
What is the typical quiescent current of the MCP1661T-E/OT in shutdown mode?
The MCP1661T-E/OT draws 200 nA typical quiescent current in shutdown mode when EN = GND, as specified in the Electrical Characteristics table (DS20005315B, page 3). This value excludes feedback divider current and is measured at VIN with no load. It enables multi-year battery life in infrequently used portable instruments and remote sensors.
How does the undervoltage lockout (UVLO) function on the MCP1661T-E/OT?
The MCP1661T-E/OT implements UVLO with asymmetric thresholds: it starts switching when VIN rises to 2.3V (typical) and stops when VIN falls to 1.85V (typical), providing 450 mV hysteresis. This prevents oscillation during battery discharge and ensures reliable startup from partially depleted two-cell alkaline or NiMH sources - critical for maintaining functionality in portable medical and instrumentation devices.
Can the MCP1661T-E/OT be used with ceramic output capacitors, and what is the recommended value?
Yes, the MCP1661T-E/OT is optimized for ceramic output capacitors, with Microchip specifying 4.7 µF to 10 µF X7R dielectric in the Typical Applications section (DS20005315B, pages 2–3). These values ensure stable regulation, low output ripple, and compatibility with the internal compensation - eliminating need for electrolytic or tantalum alternatives and reducing board area and ESR-related losses.
MCP1661T-E/OT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- 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):
- 2.4V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.4V
- Voltage - Output (Max):
- 32V
- Current - Output:
- 200mA
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MCP1661T-E/OT FAQ
1.How can I place an order for MCP1661T-E/OT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1661T-E/OT 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 MCP1661T-E/OT reliable?
The price and inventory of MCP1661T-E/OT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1661T-E/OT is usually 5 days.
3.What payment methods are accepted for MCP1661T-E/OT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1661T-E/OT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1661T-E/OT?
MCP1661T-E/OT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1661T-E/OT 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 MCP1661T-E/OT?
For technical support, including MCP1661T-E/OT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1661T-E/OT requirements.
6.How does Aetrix verify that MCP1661T-E/OT is sourced from the original manufacturer or authorized distributors?
All MCP1661T-E/OT 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 MCP1661T-E/OT meets industry standards.
7.What is the process for return or replacement of MCP1661T-E/OT?
All MCP1661T-E/OT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1661T-E/OT, 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 MCP1661T-E/OT part is unused and in its original packaging.
Return procedure for MCP1661T-E/OT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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