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LM3501

SNVS230C – DECEMBER 2003 – REVISED MAY 2013

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DESCRIPTION (CONTINUED)

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.

Connection Diagram

Figure 2. 8-Bump DSBGA

Top View

2

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