DESCRIPTION
This circuit is basically switch mode current regulator with 2 modes (In-rush and Holding).
In-rush current occurs in the first 64 ms of each on/off cycle with the rise time dependent on the coil’s resistance and inductance. The Hold-current is a partition of the In-rush current fixed by the ratio between V1 and V2. A control pin is provided for enabling and disabling the gate control output for the external power MOS. The MOS transistor must be chosen according to the supply voltage range and the current flowing through the solenoid.

■ WIDE SUPPLY VOLTAGE RANGE: 8 TO 35V DC
■ BUILD-IN GATE DRIVE VOLTAGE CLAMP TYP. 11V
■ LOGIC CONTROLLED ENABLING CIRCUIT
■ DIGITAL IN-RUSH TIMER
■ BUILT-IN POWER-ON RESET
■ INTERNALLY TRIMMED TIMING OSCILLATOR
■ NO EXTERNALLY TIMING CAPACITORS NEEDED
■ FIXED IN-RUSH/HOLD CURRENT RATIO
■ LOW DROP CURRENT SENSING RESISTOR
■ INTEGRATED FILTER IN THE FEEDBACK
   LOOP (TIME COSTANT OF 2µs TYP.)
■ SO-8 PACKAGE