High-Efficiency, Quad or Triple-Output
System Power Supply Controller for
Notebook Computers
The ISL62381, ISL62382, ISL62383 family of controllers
generate supply voltages for battery-powered systems. The
ISL62381 and ISL62382 include two pulse-width modulation
(PWM) controllers, adjustable from 0.6V to 5.5V, and two
linear regulators, LDO5 and LDO3, that generate a fixed 5V
and an adjustable output respectively, and each can deliver
up to 100mA. The ISL62383 has the same outputs as the
ISL62381 and ISL62382, but without LDO3 linear regulator.
The channel 2 switching regulator will automatically take
over the LDO5 load when programmed to 5V output. This
provides a large power savings and boosts efficiency. The
ISL62381, ISL62382, ISL62383 family include on-board
power-up sequencing, two power-good (PGOOD) outputs,
digital soft-start, and internal soft-stop output discharge that
prevent negative voltages on shutdown.
The patented R3 PWM control scheme provides a low jitter
system with fast response to load transients. Light-load
efficiency is improved with period-stretching discontinuous
conduction mode (DCM) operation. To eliminate noise in
audio frequency applications, an ultrasonic DCM mode is
included, which limits the minimum switching frequency to
approximately 28kHz.
The ISL62381, ISL62382, is available in 32 Ld 5x5 TQFN
package, and ISL62383 is available in 28 Ld 4x4 TQFN
package. ISL62381, ISL62382, ISL62383 family can operate
over the extended temperature range (-10°C to +100°C).