LM3501
Overview
The LM3501 is a fixed-frequency step-up DC/DC converter that is ideal for driving white LEDs for display backlighting and other lighting functions. With fully integrated synchronous switching (no external schottky diode required) and a low feedback voltage (515 mV), power efficiency of the LM3501 circuit has been optimized for lighting applications in wireless phones and other portable products (single cell Li-Ion or 3-cell NiMH battery supplies).
- 2 Synchronous Rectification, High Efficiency and no External Schottky Diode required
- Uses Small Surface Mount Components
- Can Drive 2-5 White LEDs in Series (May Function with More Low VF LEDs)
- 2.7V to 7V Input Range
- True Shutdown Isolation, no LED Leakage Current
- DC Voltage LED Current Control
- Input Undervoltage Lockout
- Internal Output Over-Voltage Protection (OVP) Circuitry, with no External Zener Diode Required LM3501-16: 15.5V OVP; LM3501-21: 20.5V OVP.
- Requires Only a Small 16V (LM3501-16) or 25V (LM3501-21) Ceramic Capacitor at the Input and Output
- Thermal Shutdown
