DC/DC Converter. GS5484 Datasheet
24V, 3A, 340KHz Synchronous Step-Down DC/DC Converter
The GS5484 is a synchronous step-down
DC/DC converter that provides wide 4.5V to 24V
input voltage range and 3A continuous load
Fault protection includes cycle-by-cycle current
limit, input UVLO, output over voltage protection
and thermal shutdown. Besides, adjustable
soft-start function prevents inrush current at
turn-on. This device uses current mode control
scheme that provides fast transient response. In
shutdown mode, the supply current is about
The GS5484 is available in an 8-pin SOIC
package, provides a very compact system
solution and good thermal conductance.
Wide Input Voltage from 4.5V to 24V
3A Output Current
Adjustable Output Voltage from 0.925V to 20V
150mΩ integrated Power MOSFET
High Efficiency Up to 92%
Fixed 340KHz Switching Frequency
Current Mode Operation
Cycle-by-Cycle current limit
Input Under Voltage Lockout
10uA Shutdown Current
Thermal Enhanced PSOP-8 Package
RoHS Compliant, 100%Pb & Halogen Free
DVD, LCD Displays
Distributed Power System
Functional Block Diagram
Table 1 recommended Component Selection
Packages & Pin Assignments
High Side Gate Drive Boost Input. A 10nF or greater capacitor must be connected from
this pin to SW. It can boost the gate drive to fully turn on the internal high side NMOS.
Power Supply Input Pin. Drive 4.5V to 24V voltage to this pin to power on this chip.
Connecting a 10uF ceramic bypass capacitor between VIN and GND to eliminate noise.
Power Switching Output. It is the output pin that internal high side NMOS switching to
4 Ground Pin. Connecting this pin to exposed pad.
Voltage Feedback Input Pin. Connecting FB and VOUT with a resistive voltage divider.
This IC senses feedback voltage via FB and regulate it at 0.925V.
Compensation Pin. This pin is used to compensate the regulation control loop. Connect
a series RC network from COMP pin to GND.
Enable Input Pin. This pin provides a digital control to turn the converter on or off.
Connect to VIN with a 100KΩ resistor for self-startup.
Soft-Start Input Pin. This pin controls the soft-start period. Connect a capacitor from SS
to GND to set the soft start period.