Datasheet Intersil ISL78322 — 数据表

DATASHEET
ISL78322 FN7908
Rev 3.00
November 30, 2016 Dual 2A/1.7A, 2.25MHz High-Efficiency, Synchronous Buck Regulator Features The ISL78322 is a high-efficiency, dual synchronous step-down
DC/DC regulator that can deliver up to 2A/1.7A continuous
output current per channel. The channels are 180В° out-ofphase for input RMS current and EMI reduction. The supply
voltage range of 2.8V to 5.5V allows for the use of a single Li+
cell, three NiMH cells or a regulated 5V input. The current
mode control architecture enables very low duty cycle
operation at high frequency with fast transient response and
excellent loop stability. The ISL78322 operates at 2.25MHz
switching frequency, which allows for the use of small, low cost
inductors and capacitors. Each channel is optimized for
generating an output voltage as low as 0.6V. Dual 2A/1.7A high-efficiency, synchronous buck regulator
with up to 97% efficiency 2.8V to 5.5V input supply range 180В° out-of-phase outputs reduce ripple current and EMI Start-up with prebiased output prevents negative current
flow in output stage External synchronization up to 8MHz Negative current detection and protection 100% maximum duty cycle for lowest dropout The ISL78322 has a forced PWM mode that reduces noise and
RF interference. Internal current mode compensation Peak current limiting, hiccup mode short-circuit protection,
and over-temperature protection The ISL78322 offers a 1ms Power-Good (PG) signal to monitor
both outputs at power-up. When shut down, ISL78322
discharges the output capacitors. Other features include
internal digital soft-start, enable for power sequence,
overcurrent protection, and thermal shutdown. The ISL78322
is offered in a 4mmx3mm, 12 Lead DFN package with 1mm …