SC410 SEMTECH [Semtech Corporation], SC410 Datasheet - Page 10

• Manufacturer Part Number: SC410
• Description: 3A EcoSpeed TM Step-Down Regulator with LDO and Ultrasonic Power Save
• Manufacturer: SEMTECH [Semtech Corporation]

Pin Descriptions
Pin #
10
1
2
3
4
5
6
7
8
9
Pin Name
PGOOD
PGND
AGND
TON
LDO
PAD
BST
VIN
EN
LX
FB
Bootstrap pin — A capacitor is connected between BST to LX to develop the fl oating voltage for the
high-side gate drive.
Power input supply voltage
Switching (phase) node
Power ground
Open-drain power good indicator — High impedance indicates power is good. An external pull-up
resistor is required.
Feedback input for switching regulator — Connect to an external resistor divider from the output to pro-
gram the output voltage.
Enable input for switching regulator —Pull EN high to enable the part with ultrasonic power save mode en-
abled. Connect to AGND to disable the switching regulator. A voltage divider can be added between VIN and
AGND pins for input UVLO functionality.
On-time set input — Set the on-time by connecting a series resistor to AGND.
Analog Ground.
Output for the internal LDO and internal connection to the bias node — Decoupling capacitors are required
to AGND and PGND regardless of the use of the LDO for external loads.
Thermal pad for heatsinking purposes. (Not connected internally) Connect to AGND plane using multiple
vias.
Pin Function
SC410
10