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). The LM3501 operates with a fixed 1 MHz switching frequency. When used with ceramic input and output capacitors, the LM3501 provides a small, low-noise, low-cost solution. Two LM3501 options are available with different output voltage capabilities. The LM3501-21 has a maximum output voltage of 21V and is typically suited for driving 4 or 5 white LEDs in series. The LM3501-16 has a maximum output voltage of 16V and is typically suited for driving 3 or 4 white LEDs in series (maximum number of series LEDs dependent on LED forward voltage). If the primary white LED network should be disconnected, the LM3501 uses internal protection circuitry on the output to prevent a destructive overvoltage event. A single external resistor is used to set the maximum LED current in LED-drive applications. The LED current can easily be adjusted by varying the analog control voltage on the control pin or by using a pulse width modulated (PWM) signal.
The LM3501 is a fixed‑frequency step‑up DC/DC converter designed for driving white LEDs in display backlighting, handheld devices, digital cameras and other portable applications. It operates from a single‑cell Li‑ion or 3‑cell NiMH battery (2.7 V‑7 V) and provides up to 21 V output, suitable for 2‑5 LEDs in series.
Key features include synchronous rectification with no external Schottky diode, a small 8‑bump thin‑film SMD package, true shutdown isolation, input undervoltage lockout, and internal over‑voltage protection. The device is supplied in micro‑SMD packages (TL‑08) with ordering options for 16 V (LM3501‑16) and 21 V (LM3501‑21) versions.
| Input voltage range | 2.7 V – 7 V |
|---|---|
| Switching frequency | 1 MHz (fixed) |
| Maximum output voltage (LM3501‑16) | 15.5 V |
| Maximum output voltage (LM3501‑21) | 20.5 V |
| Quiescent current (device not FB) | 0.95 µA – 12 µA |
The LM3501 operates from 2.7 V to 7 V input.
It can drive 2‑5 white LEDs in series, and may function with more low‑voltage LEDs.
The device uses a fixed 1 MHz switching frequency.
Yes, it offers true shutdown isolation with no LED leakage current.