2.2A 32V Synchronous Rectified Step-Down Converter TD2776
Figure 2 Pin Configuration of TD2776(Top View)
Pin Number Pin Name Description
High-Side Gate Drive Boost Input. BS supplies the drive for the high-side N-Channel
MOSFET switch. Connect a 0.01µF 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 32V power source. Bypass IN to GND with a
suitably large capacitor to eliminate noise on the input to the IC. See Input Capacitor.
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.
4 GND Ground.
Feedback Input. FB senses the output voltage to regulate that voltage. Drive FB
with a resistive voltage divider from the output voltage. The feedback threshold
is 0.923V. See Setting the Output Voltage.
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. See Compensation Components.
Enable Input. EN is a digital input that turns the regulator on or off. Drive EN high to
turn on the regulator, drive it low to turn it off. Pull up with 100kΩ resistor for
Soft-Start Control Input. SS controls the soft start period. Connect a capacitor from SS
to GND to set the soft-start period. A 0.1µF capacitor sets the soft-start period to 15ms.
To disable the soft-start feature, leave SS unconnected.
October, 20, 2010.
Techcode Semiconductor Limited