LM3500
Overview
The LM3500 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 intergrated synchronous switching (no external schottky diode required) and a low feedback voltage (500mV), power efficiency of the LM3500 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
- Internal Output Over-Voltage Protection (OVP) Circuitry, with no External Zener Diode Required - LM3500-16: 15.5V OVP; LM3500-21: 20.5V OVP.
- True Shutdown Isolation
- Input Undervoltage Lockout
- Requires Only Small Ceramic Capacitors at the Input and Output
- Thermal Shutdown
- 0.1µA Shutdown Current
