SC189ASKTRT Semtech, SC189ASKTRT Datasheet - Page 14

• Manufacturer Part Number: SC189ASKTRT
• Description: 2.5MHz, 1.5A Synchronous Step Down Regulator In SOT-23_5
• Manufacturer: Semtech

© 2009 Semtech Corp.
Pin Descriptions
(MPLD-UT6)
Pin #
1
2
3
4
5
6
T
Not Available
Not Available
(SOT23-5)
Pin #
3
1
5
2
4
Thermal Pad
Pin Name
VOUT
GND
VIN
NC
EN
LX
Pin Function
No connection.
Enable pin. When connected to logic high or tied to VIN pin, the SC189 is on. When con-
nected to logic low, the device enters shutdown and consumes less than 1µA of current.
The enable pin has a 1 MΩ internal pulldown resistor. This resistor is switched in circuit
whenever the EN pin is below the enable input high threshold, or when the part is in un-
dervoltage lockout.
Input power supplies. Powers the internal circuitry and is connected to the source of high-
side P channel MOSFET.
Switching node - connect an inductor between this pin and the output capacitor.
Ground connection.
Output voltage sense pin.
Thermal pad for heatsinking purposes. This pad is not connected internally. Connect it to
GND plane.
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SC189