FAN5333B: Adjustable, 1.6MHz Boost Regulator with 30V Integrated FET Switch

The FAN5333B is a general-purpose LED driver that features Fixed-Frequency Mode operation and an integrated FET switch. This device's high output power makes it suitable to drive flash LEDs in serial connections. This device is designed to operate at high switching frequencies to minimize switching noise measured at the battery terminal of hand-held communications equipment. Quiescent current in both normal and shutdown mode is designed to be minimal to extend battery life. Normal or shutdown mode can be selected by a logic level shutdown circuitry.

The low on-resistance of the internal N-channel switch ensures high efficiency and low power dissipation. A cycle-by-cycle current limit circuit keeps the peak current of the switch below a typical value of 1.5A.

The FAN5333B is available in a 5-lead SOT-23 package.

Features

• 1.5MHz Switching Frequency
• Low Noise
• Adjustable Output Voltage
• Up to 1.5A Peak Switch Current
• 1.5W Output Power Capability
• Low Shutdown Current: <1µA
• Cycle-by-Cycle Current Limit
• Low Feedback Voltage
• Over-Voltage Protection
• Fixed-Frequency PWM Operation
• Internal Compensation
• 315mV Feedback Voltage
• Thermal Shutdown
• 5-Lead SOT-23 Package