AMC7135 High Power 6V 350mA Constant Current LED driver SOT-89

AMC7135 High Power 6V 350mA Constant Current LED Driver SOT-89 is a crucial, high-efficiency integrated circuit specifically designed to provide precise current regulation for high-brightness LEDs. This linear current regulator guarantees a stable, non-diminishing current of 350 mA to the load, dramatically extending the LED’s lifespan and ensuring consistent light output regardless of input voltage fluctuations. Furthermore, the AMC7135 requires zero external components—no inductors, resistors, or capacitors—to achieve regulation, simplifying your circuit design immensely. Consequently, this three-pin device in the compact SOT-89 package allows for easy integration into space-constrained applications like flashlight drivers and portable lighting.

Key Features:

• Fixed Constant Current Output: Delivers a guaranteed, stable current of 350 mA, ensuring maximum LED luminous efficiency and color stability.
• No External Components Required: This device operates as a complete constant current regulator on its own, eliminating the need for bulky passive components.
• Low Dropout Voltage: Requires a minimal voltage difference between input and output (typically 0.12 V at 350 mA), which maximizes efficiency and minimizes heat generation.
• Thermal Protection: Includes integrated circuitry that limits the current output as the chip temperature rises, protecting both the driver and the LED from overheating damage.
• PWM Dimming Compatibility: You can achieve brightness control easily by driving the control pin (Pin 3) with a Pulse Width Modulation (PWM) signal.

Technical Specifications:

• Output Current (I_OUT): 350 mA (±5%)
• Maximum Input Voltage (V_{IN max}): 6 V (Absolute Maximum Rating)
• Dropout Voltage (V_DO): 0.12 V (Typical at I_OUT = 350 mA)
• Operating Voltage Range: 2.7 V to 6 V
• Operating Temperature Range: −40°C to +85°C
• Quiescent Current (I_Q): Maximum 20 μA (When disabled)

Mechanical Specifications:

• Package Type: SOT-89-3 (Small Outline Transistor)
• Mounting: Surface Mount Technology (SMT)
• Thermal Pad: Large central tab functions as the heat sink and should be soldered to a wide copper area for optimal thermal management.

Dimensions:

• Body Length: 4.4 mm
• Body Width: 4.0 mm
• Body Height: 1.5 mm (Nominal)
• Pin Pitch: ≈ 1.5 mm
• Weight: < 0.1 g (Ultra lightweight)

Pinout and Wiring:

• Pin 1 (V_OUT): Connect this pin directly to the Anode (positive terminal) of the LED or LED string.
• Pin 2 (GND/Tab): Connect the center pin/pad to the circuit ground (0 V) and the heat dissipation plane.
• Pin 3 (V_IN): Connect to the input power supply (2.7 V to 6 V).
• Wiring Note: Ensure the V_IN voltage exceeds the LED Forward Voltage (V_F) plus the AMC7135’s dropout voltage (V_DO) for correct regulation.

Datasheet Reference:

• Download AMC7135 Constant Current LED Driver Datasheet

Commonly Used in:

• LED Flashlights: Providing reliable and consistent current drive for high-power single-cell LED torches.
• Portable Lighting: Integrated into headlamps, bicycle lights, and rechargeable small-scale lighting systems.
• LED Strip Drivers: Used in conjunction with other drivers to manage discrete segments of high-current LED strips.

Applications:

• Automotive Auxiliary Lighting: Driving interior or specialized signaling LEDs that require precise current control.
• Signage and Display Lighting: Ensuring uniform brightness across multiple LED light points.
• Li-ion Battery Powered Devices: Ideal for devices using single Li-ion cells (V_batt ≈ 4.2 V) to drive single 3V LEDs (V_F ≈ 3.0 V).

Equivalent Models:

• AMC7140: A functionally similar device from the same series but often providing a higher constant current output (e.g., 700 mA), however, it requires a different configuration or package.
• CL6808: Another constant current linear regulator used in similar flashlight applications, providing comparable fixed current options.
• AMC7135 Series Variants: Other versions may offer 300 mA or 380 mA fixed current levels, but the core design remains functionally identical to the 350 mA model.

Package Includes:

• 1 x AMC7135 350mA Constant Current LED Driver (SOT-89)