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Microchip Technology MCP1661T-E/MNY
- Part No.:
- MCP1661T-E/MNY
- Manufacturer:
- Microchip Technology
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
MCP1661T-E/MNY.pdf
- Description:
- IC REG BOOST ADJ 200MA 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,828
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Product details
Overview
MCP1661T-E/MNY 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 delivers up to 125 mA at 12V output from 3.3V input, supports 2.4–5.5V input range, and enables SEPIC/flyback topologies for portable battery-powered systems.
For engineers reviewing the MCP1661T-E/MNY datasheet, MCP1661T-E/MNY pinout, MCP1661T-E/MNY application, or MCP1661T-E/MNY equivalent, this device is selected for high-voltage step-up in space-constrained Li-Ion and multi-cell alkaline applications requiring low quiescent current (250 µA operating, 200 nA shutdown), UVLO protection, and integrated OVP.
Technical Context
The MCP1661T-E/MNY implements peak current-mode control with internal slope compensation, using VSENSE-derived ramp and error amplifier output (VERROR) to regulate switch on-time. Its 1.3A cycle-by-cycle current limit protects the integrated NMOS switch during transient overloads.
It features dual ground separation (SGND for signal reference, PGND for high-current return), internal soft-start (3 ms), and output overvoltage protection triggered by VFB falling below 80 mV-activated only after startup and thermal shutdown recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.4V to 5.5V - supports single-cell Li-Ion (3.0–4.2V) and two/three-cell alkaline (2.4–4.5V) without external LDO pre-regulation. |
| Output Voltage Range | Up to 32V - adjustable via external resistor divider; enables LCD bias, flash LED, and medical sensor rails from low-voltage batteries. |
| Switch RDS(ON) | 0.8 Ω @ 5V VIN - limits conduction loss in high-duty-cycle boost operation; supports >92% efficiency at mid-load. |
| Feedback Reference | 1.227V ±3% - sets output accuracy; allows precise VOUT tuning (e.g., 12.0V with 120 kΩ/1.05 MΩ divider). |
| UVLO Thresholds | Rising: 2.3V, Falling: 1.85V - prevents erratic startup from depleted batteries while maintaining operation through brief input dips. |
| Quiescent Current | 250 µA (operating), 200 nA (shutdown) - extends battery life in standby modes of handheld instruments and portable medical devices. |
| Thermal Protection | 150°C trip, 135°C hysteresis - disables switching until junction cools, preventing permanent damage during sustained overload or poor PCB thermal design. |
Pinout & Package
Package: 8-Lead 2x3 mm TDFN with exposed thermal pad (EP). Requires external connection of EP to GND for thermal performance and noise reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power supply input | Accepts 2.4–5.5V; must be decoupled with ≥4.7 µF ceramic capacitor close to pin to suppress input ripple and EMI. |
| EN | Enable control input | Logic-high (>85% VIN) enables regulation; logic-low (<7.5% VIN) forces shutdown with 200 nA IQ; no pull-up required. |
| VFB | Feedback voltage sense | Monitors resistor divider output; 1.227V reference sets VOUT = 1.227 × (1 + RTOP/RBOT); sensitive to PCB leakage above 1 MΩ. |
| SW | Switch node | Connects to boost inductor; carries peak currents up to 1.3A; requires short, low-inductance trace to minimize ringing and EMI. |
| PGND | Power ground return | Return path for NMOS switch current; must be connected to SGND at single point near IC to avoid ground bounce. |
| SGND | Signal ground reference | Reference for error amplifier and bandgap; isolated from PGND except at star point to prevent noise coupling into feedback loop. |
| NC | No connect | Pins 4 and 6 are unconnected; must remain floating-no tie to GND or other nets. |
| EP | Exposed thermal pad | Not electrically connected internally; must be soldered to large GND copper pour for thermal dissipation (θJA = 52.5°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 36V/800 mΩ NMOS switch | Eliminates external high-voltage MOSFET; reduces BOM count and layout area for 24–32V output designs. |
| Internal compensation network | Removes need for external RC compensation components; simplifies design and improves stability across load/temperature. |
| Inrush current limiting & soft-start | 3 ms controlled VOUT ramp prevents input battery sag and SW node overshoot during startup into large output capacitors. |
| Output overvoltage protection (OVP) | Disables switching if VFB drops below 80 mV-protects against feedback divider disconnection or short-to-GND faults. |
| Separate SGND and PGND pins | Enables clean analog reference grounding while routing high di/dt switch currents away from sensitive error amplifier inputs. |
Applications
| Portable Medical Sensors | LCD Bias Supply |
|---|---|
Use Scenario: Powering high-impedance analog front-end sensors and display drivers in battery-operated glucose meters and pulse oximeters. IC Role / Device Role / Timing Role: Step-up regulator generating stable 12V/24V bias rails from single Li-Ion cell (3.3–4.2V). Use Value: 200 nA shutdown current extends shelf life; UVLO prevents false readings from weak batteries; OVP safeguards sensitive analog circuitry. |
Use Scenario: Providing positive and negative bias voltages for TFT-LCD panels in handheld test equipment and industrial HMIs. IC Role / Device Role / Timing Role: Configured as flyback or SEPIC to generate isolated or inverted outputs up to 32V from low-voltage battery input. Use Value: Adjustable VOUT via resistor divider enables precise panel voltage tuning; 500 kHz switching minimizes filter component size. |
| Camera Phone Flash Driver | Hand-Held Instrument Power |
Use Scenario: Delivering pulsed 24V/100 mA to white LED flash arrays in compact imaging modules. IC Role / Device Role / Timing Role: High-efficiency boost converter with fast transient response for burst-mode LED current sourcing. Use Value: 1.3A peak current limit handles flash surge loads; 92% efficiency preserves battery runtime; small TDFN package fits tight camera bezels. |
Use Scenario: Supplying regulated 5V/12V rails for microcontrollers, ADCs, and communication interfaces in portable multimeters and spectrum analyzers. IC Role / Device Role / Timing Role: Primary DC-DC stage converting 3.0–4.2V Li-Ion to higher system rails with minimal external components. Use Value: Internal compensation and soft-start ensure stable power-up under varying battery SOC; thermal shutdown prevents field failures during extended use. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61040DRVR | Higher 28V switch rating, 0.55 Ω RDS(ON), but only 28V max VOUT and no OVP; requires external compensation. | Preferred for ultra-low-IQ (1.2 µA) light-load efficiency, but lacks OVP and 32V capability needed for medical LCD bias. | Select TPS61040DRVR only when VOUT ≤ 28V and OVP is implemented externally; MCP1661T-E/MNY preferred for 32V/protected designs. |
| LT3467EDD#TRPBF | 36V switch, 0.5 Ω RDS(ON), 1.25V feedback, but no integrated soft-start or OVP; requires external Schottky diode. | Suitable for high-current boost (up to 200 mA at 12V), but adds BOM cost and layout complexity versus MCP1661T-E/MNY's integrated solution. | Choose LT3467EDD#TRPBF for higher output current where external diode and compensation are acceptable; MCP1661T-E/MNY offers lower system cost and fault protection. |
Compared with TPS61040DRVR and LT3467EDD#TRPBF, the MCP1661T-E/MNY provides the only combination of 32V output capability, integrated OVP, internal compensation, and 200 nA shutdown current in an 8-lead TDFN-making it optimal for safety-critical, space-constrained portable systems.
Availability
MCP1661T-E/MNY is available at Aetrix Electronics and suitable for portable medical equipment, handheld instrumentation, LCD bias supplies, and camera flash drivers requiring stable component supply across long production lifecycles.
Supply support for MCP1661T-E/MNY 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 for industrial, automotive, and consumer applications.
The MCP1661 product line delivers compact, high-voltage boost conversion for battery-powered portable electronics-designed to replace discrete boost stages with integrated protection, low quiescent current, and topology flexibility (boost/SEPIC/flyback).
FAQ
What is the maximum output voltage supported by the MCP1661T-E/MNY?
The MCP1661T-E/MNY supports up to 32V output voltage, adjustable via external resistor divider connected to the VFB pin. This is enabled by its 36V-rated integrated NMOS switch and internal overvoltage protection that triggers if VFB falls below 80 mV-ensuring safe operation even with feedback network faults. The 32V limit is confirmed in Electrical Characteristics (DS20005315B, page 3) and General Description.
Does the MCP1661T-E/MNY require external compensation components?
No, the MCP1661T-E/MNY includes fully integrated compensation circuitry. Section 4.2.8 of the datasheet explicitly states "All necessary compensation components and slope compensation are integrated," eliminating the need for external RC networks. This simplifies design, reduces board area, and ensures stability across temperature and load without tuning.
How does the MCP1661T-E/MNY handle undervoltage conditions?
The MCP1661T-E/MNY implements undervoltage lockout (UVLO) with rising threshold at 2.3V and falling threshold at 1.85V. Below 1.85V, the device stops switching and enters low-power state; above 2.3V, it starts regulation. This prevents erratic behavior from depleted batteries and avoids operation in undefined regions-critical for two-cell alkaline and Li-Ion applications.
Can the MCP1661T-E/MNY be used in SEPIC or flyback configurations?
Yes, the MCP1661T-E/MNY is explicitly designed for SEPIC and flyback topologies in addition to classic boost. Section 1.0 Features lists "Easily Configurable for SEPIC or Flyback Topologies," and Figure 6-3 in the datasheet shows a validated SEPIC application. Its non-synchronous architecture and separate SGND/PGND pins support these configurations without modification.
What is the thermal resistance of the MCP1661T-E/MNY in its 8-lead TDFN package?
The MCP1661T-E/MNY in the 8-lead 2x3 mm TDFN package has a junction-to-ambient thermal resistance (θJA) of 52.5°C/W, as specified in the Temperature Specifications table (DS20005315B, page 4). This value assumes proper PCB layout with the exposed thermal pad (EP) soldered to a large GND copper pour.
MCP1661T-E/MNY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- 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:
- 8-TDFN (2x3)
MCP1661T-E/MNY FAQ
1.How can I place an order for MCP1661T-E/MNY through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1661T-E/MNY 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/MNY reliable?
The price and inventory of MCP1661T-E/MNY 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/MNY is usually 5 days.
3.What payment methods are accepted for MCP1661T-E/MNY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1661T-E/MNY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1661T-E/MNY?
MCP1661T-E/MNY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1661T-E/MNY 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/MNY?
For technical support, including MCP1661T-E/MNY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1661T-E/MNY requirements.
6.How does Aetrix verify that MCP1661T-E/MNY is sourced from the original manufacturer or authorized distributors?
All MCP1661T-E/MNY 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/MNY meets industry standards.
7.What is the process for return or replacement of MCP1661T-E/MNY?
All MCP1661T-E/MNY units undergo pre-shipment inspection (PSI). If there is an issue with MCP1661T-E/MNY, 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/MNY part is unused and in its original packaging.
Return procedure for MCP1661T-E/MNY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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