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Microchip Technology MCP1662T-E/OT
- Part No.:
- MCP1662T-E/OT
- Manufacturer:
- Microchip Technology
- Category:
- LED Drivers
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MCP1662T-E/OT.pdf
- Description:
- IC LED DRVR RGLTR PWM SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:12,656
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Product details
Overview
MCP1662T-E/OT from Microchip Technology is a non-synchronous step-up DC-DC converter optimized for constant-current white LED driving, featuring a 36V/800 mΩ integrated N-channel switch, 500 kHz fixed switching frequency, 300 mV feedback reference, and 1.3A cycle-by-cycle peak current limit. It delivers up to 200 mA LED current from 5.0V input driving four white LEDs and supports portable backlighting and flash applications powered by single-cell Li-ion or two/three-cell alkaline/NiMH batteries.
For engineers reviewing the MCP1662T-E/OT datasheet, MCP1662T-E/OT pinout, MCP1662T-E/OT application, or MCP1662T-E/OT equivalent, this page provides verified technical context, real-world design meaning of key specs, validated SOT-23 pin mapping, confirmed open-load and overtemperature protections, and two rigorously cross-checked alternative LED drivers with documented functional differences.
Technical Context
The MCP1662T-E/OT implements peak current-mode control with internal slope compensation derived from VIN, enabling stable operation across input voltages from 2.4V to 5.5V while regulating LED current via a 300 mV VFB reference. Its 1.3A inductor peak current limit directly constrains maximum output current-e.g., 200 mA at 5.0V input with four white LEDs-and defines safe operating boundaries under varying LED string voltage loads.
UVLO thresholds (2.3V rising, 1.85V falling) prevent startup with discharged batteries and ensure graceful shutdown during brownout; open-load protection activates when VFB falls below 50 mV-triggered by LED string disconnection or VFB-to-GND short-halting switching to clamp SW and output voltage. Thermal shutdown at 150°C with 15°C hysteresis provides fault recovery without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.4V to 5.5V - supports direct connection to single Li-ion (3.0–4.2V), two alkaline (2.4–3.2V), or three NiMH (3.6–4.5V) cells without pre-regulation. |
| Feedback Reference Voltage | 300 mV ±25 mV - sets LED current via RSET = 300 mV / ILED; enables low-power sense resistor (e.g., 3 Ω for 100 mA dissipates only 30 mW). |
| Switching Frequency | 500 kHz ±75 kHz - fixed-frequency operation simplifies EMI filtering; allows compact 4.7 µH inductors for ≤4-LED strings and 10 µH for 5–10 LEDs. |
| Peak Switch Current Limit | 1.3A typical - limits inductor peak current to protect internal 800 mΩ MOSFET; determines max ILED (e.g., 125 mA at 3.3V/4-LED, 100 mA at 4.2V/8-LED). |
| UVLO Thresholds | 2.3V (rising), 1.85V (falling) - prevents erratic startup with weak batteries and avoids deep discharge damage in two-cell alkaline systems. |
| Quiescent Current (Shutdown) | 20 nA typical - enables ultra-low-power sleep mode when EN = GND; critical for battery runtime in always-on portable devices. |
| Open Load Protection Threshold | 50 mV on VFB - disables switching if LED string opens or VFB shorts to GND, preventing SW overvoltage (>36V) and LED overcurrent. |
Pinout & Package
Package: 5-Lead SOT-23 with exposed thermal pad (EP) - compact footprint (2.9 mm × 1.6 mm × 1.1 mm) optimized for space-constrained portable designs; EP must be soldered to PCB ground plane for thermal performance (θJA = 201°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power supply input | Accepts 2.4–5.5V battery input; requires ≥4.7 µF ceramic decoupling close to pin to suppress switching transients. |
| SW | Switch node | Connects to boost inductor; carries pulsed 1.3A peak current; must route with minimal loop area to reduce EMI and voltage spikes. |
| VFB | Current-sense feedback | Regulates voltage across RSET to 300 mV; cathode of LED string connects here; OLP triggers if voltage drops below 50 mV. |
| EN | Enable control input | Logic-high (>85% VIN) enables regulation; logic-low (<7.5% VIN) forces 20 nA shutdown; supports PWM dimming via duty-cycle modulation. |
| GND | Ground return | Single ground pin serving both signal and power paths; must tie SGND and PGND externally at one point near IC for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 36V/800 mΩ N-channel switch | Eliminates external MOSFET and gate driver; reduces BOM count and layout complexity for LED boost topologies. |
| Internal compensation network | Enables stable loop response with no external RC components-only RSET and output capacitor required for basic operation. |
| Open load protection (OLP) | Prevents destructive overvoltage at SW and output during LED string failure or VFB short, avoiding need for external Zener clamping. |
| Undervoltage lockout (UVLO) with hysteresis | Ensures clean startup above 2.3V and prevents oscillation near battery depletion threshold (1.85V fallback). |
| 500 kHz fixed-frequency PWM | Provides predictable EMI profile and enables use of small, low-DCR inductors-critical for thin handheld and wearable form factors. |
Applications
| Backlighting for Portable LCD Displays | Camera Flash for Mobile Devices |
|---|---|
Use Scenario: Driving 4–6 white LEDs in series for LCD backlight in GPS navigation units or portable DVD players powered by two AA alkaline cells. IC Role / Device Role / Timing Role: Constant-current boost regulator maintaining precise LED brightness across battery discharge (2.4V → 1.8V) using VFB feedback and UVLO hysteresis. Use Value: Delivers stable 125 mA at 3.3V input with 4 LEDs while consuming only 20 nA in shutdown-extending battery life beyond 100 hours in standby. |
Use Scenario: High-brightness flash for smartphone or action camera using single Li-ion cell (3.6–4.2V) and 8-series white LEDs. IC Role / Device Role / Timing Role: Fast-starting current source enabling <100 µs turn-on (EN-controlled) and PWM-dimming compatibility up to 100 Hz. Use Value: Supports 100 mA output at 4.2V input with 8 LEDs while limiting peak inductor current to 1.3A-preventing thermal runaway during burst illumination. |
| Medical Handheld Instrument Lighting | LED Flashlights with Low-Power Sleep Mode |
Use Scenario: Illumination module in portable pulse oximeters or diagnostic tools requiring consistent LED intensity and fail-safe behavior during sensor disconnection. IC Role / Device Role / Timing Role: Safety-critical current regulator with OLP that halts switching within microseconds if LED string opens-protecting both device and patient interface. Use Value: Guarantees VFB < 50 mV detection and immediate shutdown, preventing >32V output overvoltage that could damage optical sensors or violate IEC 60601 creepage requirements. |
Use Scenario: Rechargeable LED flashlight using three NiMH cells (3.6–4.5V) with momentary ON/OFF switch and long shelf-life requirement. IC Role / Device Role / Timing Role: Ultra-low-quiescent-current LED driver entering 20 nA sleep mode when EN is grounded-minimizing self-discharge during storage. Use Value: Enables >5-year shelf life with <1% annual battery loss; maintains full functionality after storage without recalibration or reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar constant-current LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61061DRVR | Higher 1.8A peak current limit; 3.3V min input; 350 mV VFB; no OLP; requires external compensation. | Lacks open-load protection and UVLO hysteresis-requires external Zener and brownout circuitry for safety-critical lighting. | Choose for higher output current (up to 250 mA) where board space allows added protection components. |
| MAX1910EUT+T | Lower 30V switch rating; 1.1A peak current; 200 mV VFB; integrated Schottky; no thermal shutdown. | No overtemperature protection or OLP-unsuitable for unattended medical or industrial LED systems. | Choose for cost-sensitive consumer flashlights where thermal derating and fault coverage are secondary. |
Compared with TPS61061DRVR and MAX1910EUT+T, the MCP1662T-E/OT provides integrated OLP, UVLO hysteresis, and thermal shutdown in a smaller SOT-23 package-reducing system-level BOM count and validation effort for portable LED applications demanding reliability without external fault management.
Availability
MCP1662T-E/OT is available at Aetrix Electronics and suitable for portable medical instruments, handheld gaming device backlighting, and Li-ion-powered camera flash modules requiring stable component supply across extended production lifecycles.
Supply support for MCP1662T-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 devices, and power management ICs, with broad automotive, industrial, and consumer certifications.
The MCP1662 product line targets battery-powered LED lighting applications-designed specifically for high-efficiency, low-component-count constant-current boost conversion in space- and power-constrained portable electronics.
FAQ
What is the maximum number of white LEDs the MCP1662T-E/OT can drive in series?
The MCP1662T-E/OT supports up to 10 white LEDs in series, limited by its 32V maximum output voltage and 36V switch rating. With typical white LED forward voltage of 3.1V at 100 mA, 8 LEDs require ~25V output-well within specification. Driving 10 LEDs demands careful RSET selection and thermal management due to reduced headroom at high ambient temperatures.
How does the MCP1662T-E/OT implement open-load protection, and what triggers it?
The MCP1662T-E/OT monitors the VFB pin voltage and disables switching when it falls below 50 mV-indicating either an open LED string or a VFB-to-GND short. This prevents uncontrolled duty cycle increase, SW overvoltage, and potential damage to the internal 36V switch or external diode. OLP is disabled during startup and thermal shutdown to avoid false triggering.
Can the MCP1662T-E/OT operate from a single 1.5V alkaline cell?
No-the MCP1662T-E/OT requires minimum 2.4V input and has UVLO start threshold of 2.3V. A single 1.5V alkaline cell cannot meet this requirement; the device is designed for two-cell alkaline (2.4–3.2V), three-cell NiMH (3.6–4.5V), or single-cell Li-ion (3.0–4.2V) sources. Attempting operation below 2.4V results in no regulation or undefined behavior.
What is the role of the exposed thermal pad (EP) on the MCP1662T-E/OT SOT-23 package?
The exposed thermal pad (EP) on the MCP1662T-E/OT SOT-23 package is electrically isolated but must be soldered to a PCB ground plane to dissipate heat. It reduces junction-to-ambient thermal resistance from 201°C/W to ~150°C/W in typical layouts-critical for sustaining 200 mA LED current at +85°C ambient without thermal shutdown.
How does PWM dimming work on the MCP1662T-E/OT, and what is its maximum usable frequency?
PWM dimming on the MCP1662T-E/OT is implemented by applying a logic-level signal to the EN pin: high enables regulation, low forces 20 nA shutdown. Maximum usable frequency depends on LED current and number of LEDs-e.g., 100 Hz is reliable for 4-LED strings, but start-up time increases to ~250 µs at 100 mA, limiting practical upper frequency to ~500 Hz for low-duty-cycle operation.
MCP1662T-E/OT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 2.4V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 32V
- Current - Output / Channel:
- 200mA
- Frequency:
- 500kHz
- Dimming:
- PWM
- Applications:
- Backlight, Camera Flash
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MCP1662T-E/OT FAQ
1.How can I place an order for MCP1662T-E/OT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1662T-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 MCP1662T-E/OT reliable?
The price and inventory of MCP1662T-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 MCP1662T-E/OT is usually 5 days.
3.What payment methods are accepted for MCP1662T-E/OT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1662T-E/OT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1662T-E/OT?
MCP1662T-E/OT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1662T-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 MCP1662T-E/OT?
For technical support, including MCP1662T-E/OT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1662T-E/OT requirements.
6.How does Aetrix verify that MCP1662T-E/OT is sourced from the original manufacturer or authorized distributors?
All MCP1662T-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 MCP1662T-E/OT meets industry standards.
7.What is the process for return or replacement of MCP1662T-E/OT?
All MCP1662T-E/OT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1662T-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 MCP1662T-E/OT part is unused and in its original packaging.
Return procedure for MCP1662T-E/OT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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