Datasheet LT3493-3 (Analog Devices) - 6
| Fabricante | Analog Devices |
| Descripción | 1.2A, 750kHz Step-Down Switching Regulator in 2mm × 3mm DFN |
| Páginas / Página | 20 / 6 — PI FU CTIO S. FB (Pin 1):. VIN (Pin 5):. SHDN (Pin 6):. GND (Pin 2):. … |
| Formato / tamaño de archivo | PDF / 391 Kb |
| Idioma del documento | Inglés |
PI FU CTIO S. FB (Pin 1):. VIN (Pin 5):. SHDN (Pin 6):. GND (Pin 2):. BOOST (Pin 3):. Exposed Pad (Pin 7):. SW (Pin 4):. BLOCK DIAGRA
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LT3493-3
U U U PI FU CTIO S FB (Pin 1):
The LT3493-3 regulates its feedback pin to
VIN (Pin 5):
The VIN pin supplies current to the LT3493-3’s 780mV. Connect the feedback resistor divider tap to this internal regulator and to the internal power switch. This pin. Set the output voltage according to VOUT = 0.78V • pin must be locally bypassed. (1 + R1/R2). A good value for R2 is 10k.
SHDN (Pin 6):
The SHDN pin is used to put the LT3493-
GND (Pin 2):
Tie the GND pin to a local ground plane below 3 in shutdown mode. Tie to ground to shut down the the LT3493-3 and the circuit components. Return the LT3493-3. Tie to 2.3V or more for normal operation. If the feedback divider to this pin. shutdown feature is not used, tie this pin to the VIN pin. SHDN also provides a soft-start function; see the Applica-
BOOST (Pin 3):
The BOOST pin is used to provide a drive tions Information section. voltage, higher than the input voltage, to the internal bipolar NPN power switch.
Exposed Pad (Pin 7):
The Exposed Pad must be soldered to the PCB and electrically connected to ground. Use a
SW (Pin 4):
The SW pin is the output of the internal power large ground plane and thermal vias to optimize thermal switch. Connect this pin to the inductor, catch diode and performance. boost capacitor.
W BLOCK DIAGRA
VIN V 5 IN C2 INT REG AND UVLO D2 ON OFF Σ BOOST 3 SLOPE R R3 COMP Q SHDN 6 C3 S Q DRIVER Q1 C4 L1 OSC SW 4 VOUT C1 D1 FREQUENCY FOLDBACK VC gm 780mV GND FB 2 1 R2 R1 3493-3 BD 3493-3f 6
U U U PI FU CTIO S FB (Pin 1):
The LT3493-3 regulates its feedback pin to
VIN (Pin 5):
The VIN pin supplies current to the LT3493-3’s 780mV. Connect the feedback resistor divider tap to this internal regulator and to the internal power switch. This pin. Set the output voltage according to VOUT = 0.78V • pin must be locally bypassed. (1 + R1/R2). A good value for R2 is 10k.
SHDN (Pin 6):
The SHDN pin is used to put the LT3493-
GND (Pin 2):
Tie the GND pin to a local ground plane below 3 in shutdown mode. Tie to ground to shut down the the LT3493-3 and the circuit components. Return the LT3493-3. Tie to 2.3V or more for normal operation. If the feedback divider to this pin. shutdown feature is not used, tie this pin to the VIN pin. SHDN also provides a soft-start function; see the Applica-
BOOST (Pin 3):
The BOOST pin is used to provide a drive tions Information section. voltage, higher than the input voltage, to the internal bipolar NPN power switch.
Exposed Pad (Pin 7):
The Exposed Pad must be soldered to the PCB and electrically connected to ground. Use a
SW (Pin 4):
The SW pin is the output of the internal power large ground plane and thermal vias to optimize thermal switch. Connect this pin to the inductor, catch diode and performance. boost capacitor.
W BLOCK DIAGRA
VIN V 5 IN C2 INT REG AND UVLO D2 ON OFF Σ BOOST 3 SLOPE R R3 COMP Q SHDN 6 C3 S Q DRIVER Q1 C4 L1 OSC SW 4 VOUT C1 D1 FREQUENCY FOLDBACK VC gm 780mV GND FB 2 1 R2 R1 3493-3 BD 3493-3f 6