CN5711 1.5A 2.8V~6V High Brightness LED Driver IC SOIC-8

CN5711 1.5A 2.8V~6V High Brightness LED Driver IC SOIC-8 is a current-regulation integrated circuit designed specifically for driving high-brightness LEDs efficiently from low-voltage power sources. This advanced chip operates within a flexible input range of 2.8V to 6V, which allows it to work seamlessly with single-cell lithium batteries, multi-cell Alkaline packs, or standard 5V USB rails. Consequently, it eliminates the need for complex inductor-based switching configurations, dramatically simplifying the overall circuit layout and minimizing electromagnetic interference. The device delivers an adjustable constant current up to 1.5A using a single external resistor, ensuring uniform brightness and protecting the LEDs from thermal runaway. Furthermore, an integrated chip-enable function supports precise pulse-width modulation (PWM) dimming control. Therefore, you can reliably use this integrated circuit to build high-efficiency portable lighting, emergency lamps, and robust solar-powered LED systems.

Key Features:

• Adjustable Constant Current: The IC drives output currents from 90 mA up to 1.5A via a single external programming resistor, providing ultimate design flexibility.
• Low Dropout Voltage: Features an incredibly low dropout voltage of just 0.37V at 1.5A, which significantly maximizes battery runtime and system efficiency.
• Built-in Thermal Regulation: Automatically reduces the output current if the die temperature reaches ≈ 135°C, preventing damage to both the IC and the connected LEDs.
• PWM Dimming Support: Accepts a digital PWM signal at the CE pin to allow smooth, high-resolution brightness adjustment without shifting color temperature.
• Soft-Start Capability: Includes internal soft-start circuitry that effectively clamps transient inrush currents during initial power-up sequences.

Technical Specifications:

• Input Voltage Range: 2.8V to 6V
• Maximum Output Current: 1.5A
• Current Accuracy: ±8%
• CE Dimming Frequency: Up to 2 kHz
• Output Current Temperature Coefficient: ±25 ppm/°C
• Operating Junction Temperature: −40°C to +85°C

Mechanical Specifications:

• Package Type: SOIC-8 (Small Outline Integrated Circuit)
• Lead Count: 8-pin surface mount
• Encapsulation Material: Molded Plastic (UL 94 V-0 compliant)
• Thermal Resistance (θ_JA): ≈ 125°C/W (Varies based on PCB copper area)

Dimensions:

• Body Length: ≈ 4.90 mm
• Body Width (Excluding Leads): ≈ 3.90 mm
• Total Width (Including Leads): ≈ 6.00 mm
• Pin Pitch: 1.27 mm (Standard SOIC spacing)
• Package Height: ≈ 1.65 mm

Pinout and Wiring:

• Pin 1 (CE): Chip Enable / PWM Dimming input. Pull high to enable the device or apply a PWM signal to dim the LEDs.
• Pin 2 (VCC): Supply input pin. Connect directly to your 2.8V to 6V power source and decouple with a ceramic capacitor.
• Pin 3 (ISET): Current setting pin. Connect a resistor from this pin to ground to establish the maximum LED current.
• Pin 4 (GND): Ground connection. Bond this securely to the system ground plane to facilitate optimal heat dissipation.
• Pins 5, 6, 7, 8 (LED): Constant current output pins. Connect these pins in parallel directly to the anode or cathode of the LED array as designated by the application circuit.

Datasheet Reference:

• Download Consonance Electronics CN5711 Datasheet

Commonly Used in:

• Lithium Battery Powered Devices: Driving high-power LEDs straight from a 3.7V 18650 cell or Li-Po pack.
• USB Lighting Fixtures: Powering high-brightness desktop task lights and ring lights from standard 5V USB ports.
• Solar Lanterns: Serving as the low-voltage, high-efficiency constant current driver stage in clean-energy lighting solutions.

Applications:

• Flashlights and Headlamps: Managing power delivery in multi-mode portable illumination gear safely.
• Emergency Backup Lights: Maintaining a steady light output during supply voltage drops in safety systems.
• Architectural Accent Lighting: Delivering uniform current to low-voltage LED strips or spot modules.

Equivalent Models:

• AMC7135: A fixed-current linear LED driver, however, it lacks the adjustable current flexibility and the wide 1.5A range of the CN5711.
• PT4115: A popular buck switching regulator variant, although it requires an external inductor and diode to function.
• QX7136: A linear constant current driver handling similar low-voltage inputs via an external power transistor setup.

Package Includes:

• 1 x CN5711 1.5A 2.8V~6V High Brightness LED Driver IC SOIC-8