 Features
 Low RDS(ON) for internal switches (top/bottom)
80 mΩ / 40 mΩ, 3.0 A
 4.5 V to 30 V input voltage range
 Switching frequency: 700 kHz
 Feedback reference voltage: 0.6 V (typ.)
 Fixed frequency COT architecture achieves
ultra fast transient response
 High-efficiency synchronous mode
 Internal soft-start limits the inrush current
 Overcurrent protection
 Output short-circuit protection with hiccup
 Thermal shutdown
 Operating temperature range: -40°C to 85°C
 Applications
 Portable navigation devices
 Set-top boxes
 Portable TVs
 LCD TVs
 Description
The DIO54312 is a high-efficiency,
high-frequency synchronous step-down DC-DC
regulator IC capable of delivering up to 3 A output
currents. The DIO54312 operates over a wide
input voltage range from 4.5 V to 30 V and
integrates the main switch and synchronous
switch with very low RDS(ON) to minimize the
conduction loss. The output voltage can be
regulated to as low as 0.6 V.
The COT architecture with pseudo-fixed switching
frequency operation provides a fast transient
response and eases loop stabilization. The
DIO54312 operates in pulse skip mode where the
device maintains a high efficiency during light
load operation. Protection features include
overcurrent protection and thermal shutdown.
The DIO54312 requires a minimal number of
readily-available, standard, external components
and is available in a space-saving TSOT23-6
package.