Synchronous Step-up DC/DC Converter For White LED Applications

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 intergrated 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 on the shutdown pin. In shutdown, the LM3501 completely disconnects the input from output, creating total isolation and preventing any leakage currents from trickling into the LEDs
By National Semiconductor Corporation
Part Manufacturer Description Datasheet Samples
LM3501TLX-21/NOPB Texas Instruments Synchronous Step-up DC/DC Converter for White LED Applications 8-DSBGA -40 to 85
LM3501TL-21/NOPB Texas Instruments Synchronous Step-up DC/DC Converter for White LED Applications 8-DSBGA -40 to 85
LM3501TLX-16/NOPB Texas Instruments Synchronous Step-up DC/DC Converter for White LED Applications 8-DSBGA -40 to 85
LM3501TL-16/NOPB Texas Instruments Synchronous Step-up DC/DC Converter for White LED Applications 8-DSBGA -40 to 85
LM3501 's PackagesLM3501 's pdf datasheet
LM3501TL-16EV
LM3501TL-16
LM3501TL-21
LM3501TLX-16
LM3501TLX-21




LM3501 Pinout, Pinouts
LM3501 pinout,Pin out
This is one package pinout of LM3501,If you need more pinouts please download LM3501's pdf datasheet.

LM3501 Application circuits
LM3501 circuits
This is one application circuit of LM3501,If you need more circuits,please download LM3501's pdf datasheet.


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