AME
AME5268
n
Pin Description
Pin Number
1
3A, 28V, 340KHz Synchronous
Rectified Step-Down Converter
Pin Name
BS
Pin Description
High-Side Gate Drive Boost Input. BS supplies the drive for the high-side N-
Channel MOSFET switch. Connect a 10nF or greater capacitor from SW to
BS to power the high side switch.
Power Input. IN supplies the power to the IC, as well as the step-down
converter switches. Drive IN with a 4.75V to 28V power source. Bypass IN to
GND with a suitable large capacitor to eliminate noise on the input to the IC.
Power Switching Output. SW is the switching node that supplies power to the
output. Connect the output LC filter from SW to the output load. Note that a
capacitor is required from SW to BS to power the high-side switch.
Ground. Connect the exposed pad to pin 4.
Feedback Input. FB senses the output voltage to regulate that voltage. Drive
FB with a resistive voltage divider from the output voltage. The feedback
reference voltage is 0.925V.
Compensation Node. COMP is used to compensate the regulation control
loop. Connect a series RC network from COMP to GND to compensate the
regulation control loop. In some cases, an additional capacitor from COMP to
GND is required.
Enable Input. EN is a digital input that turns the regulator on or off. Drive EN
higher than 2.7V to turn on the regulator, drive it lower than 1.1V to turn it off.
Pull up to the IN pin with 100KΩ resister for automatic start up.
Soft-start Control Input. SS controls the soft-start period. Connect a capacitor
from SS to GND to set the soft-start period. Add a 0.1µF capacitor set the
soft-start period to 15mS. To disable the soft start feature, leave the SS
unconnected.
2
IN
3
4
5
SW
GND
FB
6
COMP
7
EN
8
SS
4
Rev.B.01
AME [ ANALOG MICROELECTRONICS ]
