AP1518K5A

The AP1518K5A is monolithic IC designed for a step-down DC/DC converter, and own the ability of driving a 3A load without external transistor. The feature of AP1518K5A are as follows: (1)adjustable version output voltage range, 0.8V to 18V±4%; (2)300KHz ±15% fixed switching frequency; (3)voltage mode non-synchronous PWM control; (4)thermal-shutdown and current-limit protection; (5)ON/OFF shutdown control input; (6)operating voltage can be up to 22V; (7)Output load current: 3A; (8)TO220-5L and TO263-5L Pb-Free packages; (9)Low power standby mode; (10)built-in switching transistor on chip.

The absolute maximum ratings of the AP1518K5A are: (1)supply voltage: +24 V; (2)ON/OFF pin input voltage: -0.3 to +18 V; (3)feedback pin voltage: -0.3 to +18 V; (4)output voltage to ground: -1 V; (5)power dissipation: internally limited; (6)storage temperature: -65 to +150 oC; (7)operating temperature: -40 to +125 oC; (8)operating voltage: +4.5 to +22 V.

The following is about the electrical characteristics of AP1518K5A: (1)Feedback bias current: -10nA typical and -50nA max at  VFB=0.8V; (2)Oscillator frequency: 255KHz min, 300KHz typical and 345KHz max; (3)Oscillator frequency of short circuit protect: 10KHz min, 30KHz typical and 50KHz max at When current limit occurred and VFB < 0.5V, Ta=25 ; (4)Saturation Voltage: 1.4V typical and 1.6V max at IOUT=3A, No outside circuit, VFB=0V force driver on; (5)Current limit: 3.6A min, 4.5A typical and 5.5A max at Peak current, No outside circuit, VFB=0 force driver on; (6)Quiescent Current: 5mA typicao and 10mA max at VFB=12 force driver off; (7)Standby Quiescent Current: 70A typical and 150A max at ON/OFF pin=5V, VIN=22V; (8)ON/OFF pin logic input current: -0.01A max at VLOGIC=2.5V (OFF); (9)ON/OFF pin input current: -0.1A typical and -1A max at VLOGIC=0.5V (ON).