Datasheet LT3483, LT3483A (Analog Devices) - 5

LT3483/LT3483A
PIN FUNCTIONS (DFN/TSOT-23) FB (Pin 1/Pin 3):
Feedback. Place resistor to negative
D (Pin 7/Pin 5):
Anode Terminal of Integrated Schottky output here. Set resistor value R1 = VOUT/10µA. Diode. Connect to negative terminal of transfer capaci-
GND (Pins 2, 3/Pin 2):
Ground. For DFN package, tie both tor and external inductor L2 (flyback configuration) or pin 2 and pin 3 together to ground. to cathode of external Schottky diode (inverting charge pump configuration).
SW (Pin 4/Pin 1):
Switch. Connect to external inductor L1 and positive terminal of transfer capacitor.
SHDN (Pin 8/Pin 4):
Shutdown. Connect to GND to turn device off. Connect to supply to turn device on.
VIN (Pin 5/Pin 6):
Input Supply. Must be locally bypassed with 1µF or greater.
Exposed Pad (Pin 9/NA):
GND. The exposed pad should be soldered to the PCB ground to achieve the rated thermal
NC (Pin 6/NA):
No Internal Connection. performance.
BLOCK DIAGRAM
L1A L1B VIN VOUT • CFLY • COUT 6 1 5 VIN SW D 1.250V 300ns REFERENCE DELAY 125k S Q R Q Q1 D1 R1 FB VOUT 3 + 25mV + A3 A2 – + – A1 0.1Ω 0.1Ω – 20mV (LT3483) GND 2 3483 BD OPTIONAL CHARGE PUMP CONFIGURATION. PIN NUMBERS CORRESPOND TO THE L1B REPLACED WITH: 6-PIN TSOT-23 PACKAGE D2 R2 D VOUT 3483fc 5 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration order information Electrical Characteristics Typical Performance Characteristics pin functions block diagram operation applications information typical applications Package Description Revision History Typical Application Related Parts