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Microchip Technology MCP1665T-E/MRA
- Part No.:
- MCP1665T-E/MRA
- Manufacturer:
- Microchip Technology
- Package:
- 10-VFQFN Exposed Pad
- Datasheet:
-
MCP1665T-E/MRA.pdf
- Description:
- IC REG BOOST ADJ 1A 10VQFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MCP1665T-E/MRA from Microchip Technology is a nonsynchronous, fixed-frequency boost DC-DC converter with an integrated 36V, 100 mΩ NMOS switch, 500 kHz PWM operation, and selectable PFM/PWM mode via MODE pin. It delivers up to 1 A at 12 VOUT from 3.6 VIN, supports input range 2.9–5 V, features 1.2 V feedback reference, and is used in Li-Ion-powered LED flash and portable medical equipment.
For engineers reviewing the MCP1665T-E/MRA datasheet, MCP1665T-E/MRA pinout, MCP1665T-E/MRA application, or MCP1665T-E/MRA equivalent, this page provides verified technical context, validated pin functions, confirmed topology support (boost/SEPIC/flyback), real-world efficiency curves, and two documented alternative parts for battery-powered high-voltage step-up designs.
Technical Context
The MCP1665T-E/MRA implements peak current-mode control with internal slope compensation proportional to input voltage, enabling stable operation across wide VIN and VOUT ranges. Its 3.6 A typical cycle-by-cycle inductor peak current limit and integrated 36 V switch allow reliable 24 V output generation from single-cell Li-Ion sources.
It supports dual operating modes: PWM-only (MODE = GND) for low-output-ripple constant-frequency operation, and PFM/PWM (MODE = VIN) for ultra-low quiescent current (250 µA typ. no-load) in battery-critical applications. UVLO (2.85 V start, 2.65 V stop) and thermal shutdown (150 °C) ensure robustness in portable systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.9 V to 5.0 V - supports single-cell Li-Ion (3.3–4.2 V) and three-cell alkaline/NiMH without external LDO pre-regulation. |
| Output Voltage Range | Up to 32 V - adjustable via resistor divider; enables LCD bias, camera flash, and 24 V lighting from low-input batteries. |
| Switch Rating | 36 V, 100 mΩ NMOS - withstands 24 V output with <100 mV conduction loss at 1 A, reducing thermal stress in compact layouts. |
| Peak Switch Current Limit | 3.6 A typical - sets maximum inductor current; determines achievable output power (e.g., >700 mA at 12 VOUT/3.3 VIN). |
| Feedback Reference Voltage | 1.2 V ±3% - defines output regulation accuracy; enables precise VOUT setting with standard resistor tolerances. |
| Quiescent Current (PFM) | 250 µA typical - extends battery life in standby; drops to 0.4 µA in shutdown (EN = GND). |
| Switching Frequency | 500 kHz ±15% - balances EMI performance and inductor size; skipping mode available for light-load efficiency. |
| Operating Junction Temp | –40°C to +125°C - qualified for industrial and portable medical use; thermal shutdown activates at 150°C with 15°C hysteresis. |
Pinout & Package
Package: 10-lead 2×2 mm VQFN with exposed thermal pad (EP). Requires low-impedance connection of PGND, SGND, and EP to a common ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 10 (PGND) | Power Ground | High-current return path for NMOS switch; must be connected externally to SGND at single point to avoid noise coupling. |
| 3 (SGND) | Signal Ground | Reference for error amplifier and VFB comparator; separation from PGND minimizes switching noise on feedback loop. |
| 4 (VFB) | Feedback Input | Monitors output via resistor divider; 1.2 V reference enables adjustable VOUT; OVP/OLP protection triggers if voltage deviates >5% or drops <80 mV. |
| 5 (MODE) | Mode Select | Configures PFM/PWM (MODE = VIN) for max efficiency or PWM-only (MODE = GND) for low ripple and predictable frequency. |
| 6 (VIN) | Input Supply | Primary power source (2.9–5 V); powers internal bias circuits; requires ≥22 µF ceramic decoupling to PGND. |
| 7 (EN) | Enable Control | Logic-level input: EN > 70% VIN enables regulation; EN < 18% VIN forces shutdown (0.4 µA IQ). |
| 8, 9 (SW) | Switch Node | Connects to boost inductor; carries 3.6 A peak current; voltage swings from ~0 V to VOUT + VF; requires short, low-inductance routing. |
| EP | Exposed Thermal Pad | No internal electrical connection; must be soldered to PCB ground plane for thermal dissipation (θJA = 48.3°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 36 V / 100 mΩ NMOS switch | Eliminates external high-voltage MOSFET; reduces BOM count and layout area for 24 V output designs. |
| Auto-selectable PFM/PWM or forced PWM mode | Enables >92% efficiency at light loads (PFM) while maintaining tight ripple and fixed frequency under full load (PWM). |
| Internal soft-start and inrush limiting | Prevents output overshoot and input current spikes during startup from low-VIN sources like discharged Li-Ion cells. |
| Output overvoltage (OVP) and open-load (OLP) protection | Disables switching if VFB shorts to GND or disconnects-prevents destructive SW node overvoltage in fault conditions. |
| Thermal shutdown with hysteresis | Halts operation at 150°C junction temp and resumes only after cooling by 15°C-avoids thermal cycling in enclosed enclosures. |
| Configurable for boost, SEPIC, or flyback topologies | Single IC supports multiple isolated/non-isolated architectures; simplifies design reuse across product families with varying VOUT needs. |
Applications
| Camera Phone Flash | LCD Bias Supply |
|---|---|
|
Use Scenario: High-current pulse for LED flash in mobile phones powered by single-cell Li-Ion (3.3–4.2 V). IC Role / Device Role / Timing Role: Boost regulator generating 24 V from battery to drive white LEDs at >350 mA peak. Use Value: Delivers >92% efficiency at 350 mA (VIN = 3.6 V, VOUT = 24 V), minimizing heat and extending battery runtime per flash event. |
Use Scenario: Generating dual-polarity bias voltages (e.g., +15 V / –10 V) for TFT-LCD panels in handheld instruments. IC Role / Device Role / Timing Role: Primary high-voltage boost stage feeding charge-pump or inverting regulators. Use Value: Adjustable 1–32 V output enables direct generation of +15 V from 3.6 V input; 500 kHz switching allows small 4.7 µH inductors. |
| Battery-Powered LEDs | Portable Medical Equipment |
|
Use Scenario: Driving strings of high-brightness LEDs from three-cell alkaline or NiMH batteries (3.6–4.5 V). IC Role / Device Role / Timing Role: Constant-current LED driver front-end providing regulated 12 V supply to current-sink ICs. Use Value: 1 A capability at 12 VOUT/3.6 VIN supports multi-LED arrays; PFM mode extends flashlight runtime beyond 10 hours. |
Use Scenario: Powering analog front-ends and display modules in portable ECG or glucose meters using single Li-Ion cell. IC Role / Device Role / Timing Role: Main DC-DC converter delivering stable 5 V and 12 V rails from 3.3–4.2 V battery input. Use Value: –40°C to +125°C qualification ensures reliability in clinical environments; UVLO prevents operation below 2.7 V (deep discharge). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61088RHLR | Higher 12 A switch current, 2.7–12 V input, but requires external compensation and lacks OVP/OLP. | Preferred for >2 A output or wider input range; unsuitable where feedback fault protection is mandatory. | Select TPS61088RHLR when higher output current or extended input range outweighs need for integrated protection. |
| LT3467EDD | Lower 30 V switch rating, 1.3 MHz switching, no PFM mode, but includes true shutdown with reverse current blocking. | Better for space-constrained designs needing high-frequency operation; not viable for 24 V output or battery-saving PFM. | Choose LT3467EDD for compact 12 V boost with minimal footprint where PFM efficiency is secondary. |
Compared with MCP1665T-E/MRA, TPS61088RHLR offers higher current headroom but demands more external components and lacks fault protections, while LT3467EDD trades off voltage capability and PFM for smaller size and higher frequency-making MCP1665T-E/MRA optimal for protected, efficient 24 V step-up from Li-Ion.
Availability
MCP1665T-E/MRA is available at Aetrix Electronics and suitable for camera flash drivers, portable medical power supplies, and LCD bias generators requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for MCP1665T-E/MRA 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 devices, and power management ICs, with broad automotive, industrial, and consumer certifications.
The MCP1665 belongs to Microchip's high-voltage boost converter family designed specifically for battery-powered portable equipment requiring 6–32 V outputs from low-input sources like single-cell Li-Ion or multi-cell alkaline batteries.
FAQ
What is the maximum output voltage supported by the MCP1665T-E/MRA?
The MCP1665T-E/MRA supports an adjustable output voltage range from VIN + 1 V up to 32 V. This is achieved using an external resistor divider on the VFB pin referenced to the internal 1.2 V bandgap. The 36 V-rated integrated NMOS switch ensures safe operation even at the upper end of this range, making MCP1665T-E/MRA suitable for 24 V LCD bias and flash applications.
How does the MODE pin affect efficiency and output ripple in the MCP1665T-E/MRA?
When MODE = VIN, the MCP1665T-E/MRA operates in PFM mode at light loads, achieving 250 µA no-load input current and >92% efficiency at 100 mA, but with higher output ripple and variable frequency. When MODE = GND, it runs in PWM-only mode, maintaining 500 kHz fixed frequency and low ripple (<50 mV) at the cost of higher light-load quiescent current (~500 µA). The choice directly impacts battery life versus signal integrity trade-offs in the final design.
Does the MCP1665T-E/MRA include protection against feedback loop faults?
Yes, the MCP1665T-E/MRA integrates both open-load protection (OLP) and overvoltage protection (OVP) tied to the VFB pin. If the feedback divider disconnects or shorts to GND, an internal comparator detects VFB falling below ~80 mV and disables switching to prevent destructive SW node overvoltage. Similarly, OVP triggers if VFB rises >5% above 1.2 V, halting operation until normal feedback is restored-critical for field-reliable portable systems.
What is the recommended inductor value and type for a 12 V output design using the MCP1665T-E/MRA?
For a 12 V output at 1 A from 3.6 V input, Microchip recommends a 4.7 µH shielded power inductor rated for ≥4 A saturation current (e.g., Coilcraft XAL4020-472MEB). Ceramic input (2×10 µF) and output (4×10 µF) capacitors are required. Inductor DCR should be minimized to preserve efficiency, and placement must minimize loop area between SW, VIN, and PGND to reduce EMI.
Can the MCP1665T-E/MRA be used in SEPIC or flyback configurations?
Yes, the MCP1665T-E/MRA is explicitly designed for easy configuration in SEPIC and flyback topologies in addition to standard boost, as confirmed in the datasheet's General Description and Section 4.0. Its nonsynchronous architecture, integrated 36 V switch, and internal compensation support all three-enabling single-IC solutions for isolated or non-inverting high-voltage outputs without redesigning the controller stage.
MCP1665T-E/MRA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 10-VFQFN 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):
- 2.7V
- Voltage - Input (Max):
- 5V
- Voltage - Output (Min/Fixed):
- 2.8V
- Voltage - Output (Max):
- 32V
- Current - Output:
- 1A
- Frequency - Switching:
- 575kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-VQFN (2x2)
MCP1665T-E/MRA FAQ
1.How can I place an order for MCP1665T-E/MRA through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1665T-E/MRA 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 MCP1665T-E/MRA reliable?
The price and inventory of MCP1665T-E/MRA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1665T-E/MRA is usually 5 days.
3.What payment methods are accepted for MCP1665T-E/MRA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1665T-E/MRA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1665T-E/MRA?
MCP1665T-E/MRA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1665T-E/MRA 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 MCP1665T-E/MRA?
For technical support, including MCP1665T-E/MRA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1665T-E/MRA requirements.
6.How does Aetrix verify that MCP1665T-E/MRA is sourced from the original manufacturer or authorized distributors?
All MCP1665T-E/MRA 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 MCP1665T-E/MRA meets industry standards.
7.What is the process for return or replacement of MCP1665T-E/MRA?
All MCP1665T-E/MRA units undergo pre-shipment inspection (PSI). If there is an issue with MCP1665T-E/MRA, 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 MCP1665T-E/MRA part is unused and in its original packaging.
Return procedure for MCP1665T-E/MRA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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