SC4217_09 Datasheet, PDF (5/11 Pages) Semtech Corporation – Very Low Input /Very Low Dropout 3 Amp Regulator With Enable

SC4217
Pin Descriptions
Pin #
1
Pin Name Pin Function
Enable input. Pulling this pin below 0.4V turns off the regulator reducing the quiescent current to a franction
EN
of its operating value. The device will be enabled if this pin is left open. Connect to V_IN if not being used.
Input voltage. For regulation at full load, the input to this pin must be between (V_O+0.5V) and 5.5V. Minimum
2
VIN
V_IN = 1.8V. A large bulk capacitance should be placed closey to this pin to ensure that the input supply does
not sag below 1.8V. A minimum of 4.7µF ceramic capacitors should be placed directly at this pin.
3
GND
Reference ground. The GND pin and the exposed die pad must be connected together at the IC pin.
4
VO
The pin is the power output of the device. A minimum of 10µF capactor should be placed directly at this pin.
Use external feedback resistors to program the output voltage. See application circuit on page 1.
5
ADJ
V_O= [(R₂+R₁)*1.24V]/R₂. The ADJ pin cannot be tied directly either to VO pin or to GND pin.
THERMAL
T
PAD
Thermal pad should be connected to PCB ground plane for thermal and electrical purposes.
Block Diagram
RSense
VIN
Current Limit
Reference
VDD
1.5uA
EN
VPump
Thermal
Shutdown
VOUT
VIN
Reverse Voltage
Shutdown
1.24V
REF
VO
ADJ
GND