DATASHEET
ISL8009A
1.5A Low Quiescent Current 1.6MHz High Efficiency Synchronous Buck Regulator
The ISL8009A is a high efficiency, monolithic, synchronous
step-down DC/DC regulator that can deliver up to 1.5A
continuous output current. It is optimized for generating low
output voltages down to 0.8V. The supply voltage range of 2.7V
to 5.5V allows for the use of single Li+cell, three NiMH cells or
a regulated 5V input. The ISL8009A uses current mode control
architecture to deliver very low duty cycle operation at high
frequency with fast transient response and excellent loop
stability. It has flexible operation mode selection of forced
PWM mode and automatic PFM/PWM with as low as 17ВµA
quiescent current, achieving high power conversion efficiency
under light load condition, hence maximizing battery life. High
1.6MHz pulse-width modulation (PWM) switching frequency
allows the use of small external components.
The ISL8009A integrates a pair of low ON-resistance
P-Channel and N-Channel internal MOSFETs to maximize
efficiency and minimize external component count. The 100%
duty-cycle operation allows less than 400mV dropout voltage
at 1.5A output current.
The ISL8009A offers a 2ms Power-On-Reset (POR) timer at …
