Datasheet LTC3823 (Analog Devices) - 8
| Fabricante | Analog Devices |
| Descripción | Fast No RSENSE Step-Down Synchronous DC/DC Controller with Differential Output Sensing, Tracking and PLL |
| Páginas / Página | 26 / 8 — PIN FUNCTIONS (UH/GN). PGND (Pin 22/Pin 22):. Z0 (Pin 28/Pin 28):. SENSE– … |
| Formato / tamaño de archivo | PDF / 315 Kb |
| Idioma del documento | Inglés |
PIN FUNCTIONS (UH/GN). PGND (Pin 22/Pin 22):. Z0 (Pin 28/Pin 28):. SENSE– (Pin 23/Pin 23):. FCB (Pin 29/Pin 1):
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LTC3823
PIN FUNCTIONS (UH/GN) PGND (Pin 22/Pin 22):
Power Ground. Connect this pin
Z0 (Pin 28/Pin 28):
Dead Time Control Input. Applying a closely to the source of the bottom N-channel MOSFET, DC voltage at this pin will vary the dead time between TG the (–) terminal of CVCC and CIN. low and BG high transition. Do not force a voltage higher than INTV
SENSE– (Pin 23/Pin 23):
Current Sense Comparator In- CC on this pin. put. The negative input to the current comparator is used
FCB (Pin 29/Pin 1):
Forced Continuous Input. Connect to accurately Kelvin sense the bottom side of the sense this pin to SGND to forced continuous synchronization resistor or MOSFET. operation at low load, to INTVCC to enable discontinuous mode operation at low load, or to a resistive divider from
SENSE+ (Pin 24/Pin 24):
Current Sense Comparator a secondary output when using a secondary winding. Input. The positive input to the current comparator is normally connected to the SW node unless using a sense
RUN (Pin 30/Pin 2):
Run Control Input. A voltage above resistor. 1.5V turns on the IC. Forcing this pin below 1.5V shuts down the device.
SW (Pin 25/Pin 25):
Switch Node. The (–) terminal of the bootstrap capacitor, CB, connects here. This pin swings
VON (Pin 31/Pin 3):
On-Time Input. Connecting this pin from a diode drop below ground up to VIN. to the output voltage makes the on-time proportional to V
TG (Pin 26/Pin 26):
Top Gate Drive Output. This pin drives OUT. The comparator input defaults to 0.6V when the pin is grounded and defaults to 4.8V when the pin is tied the top N-channel MOSFET with a voltage swing equal to to INTV INTV CC. CC, superimposed on the switch node voltage SW.
PGOOD (Pin 32/Pin 4):
Power Good Output. Open-drain
BOOST (Pin 27/Pin 27):
Boosted Floating Driver Supply. logic that is pulled to ground when the output voltage is The (+) terminal of the bootstrap capacitor, CB, connects not within ±11% of the regulation point after the internal here. This pin swings from a diode voltage drop below 20μs power bad mask timer expires. INTVCC up to VIN + INTVCC.
SGND (Exposed Pad Pin 33, UH Package):
The exposed pad is signal ground. It must be soldered to PCB ground for electrical contact and for rated thermal performance. 3823fd 8
PIN FUNCTIONS (UH/GN) PGND (Pin 22/Pin 22):
Power Ground. Connect this pin
Z0 (Pin 28/Pin 28):
Dead Time Control Input. Applying a closely to the source of the bottom N-channel MOSFET, DC voltage at this pin will vary the dead time between TG the (–) terminal of CVCC and CIN. low and BG high transition. Do not force a voltage higher than INTV
SENSE– (Pin 23/Pin 23):
Current Sense Comparator In- CC on this pin. put. The negative input to the current comparator is used
FCB (Pin 29/Pin 1):
Forced Continuous Input. Connect to accurately Kelvin sense the bottom side of the sense this pin to SGND to forced continuous synchronization resistor or MOSFET. operation at low load, to INTVCC to enable discontinuous mode operation at low load, or to a resistive divider from
SENSE+ (Pin 24/Pin 24):
Current Sense Comparator a secondary output when using a secondary winding. Input. The positive input to the current comparator is normally connected to the SW node unless using a sense
RUN (Pin 30/Pin 2):
Run Control Input. A voltage above resistor. 1.5V turns on the IC. Forcing this pin below 1.5V shuts down the device.
SW (Pin 25/Pin 25):
Switch Node. The (–) terminal of the bootstrap capacitor, CB, connects here. This pin swings
VON (Pin 31/Pin 3):
On-Time Input. Connecting this pin from a diode drop below ground up to VIN. to the output voltage makes the on-time proportional to V
TG (Pin 26/Pin 26):
Top Gate Drive Output. This pin drives OUT. The comparator input defaults to 0.6V when the pin is grounded and defaults to 4.8V when the pin is tied the top N-channel MOSFET with a voltage swing equal to to INTV INTV CC. CC, superimposed on the switch node voltage SW.
PGOOD (Pin 32/Pin 4):
Power Good Output. Open-drain
BOOST (Pin 27/Pin 27):
Boosted Floating Driver Supply. logic that is pulled to ground when the output voltage is The (+) terminal of the bootstrap capacitor, CB, connects not within ±11% of the regulation point after the internal here. This pin swings from a diode voltage drop below 20μs power bad mask timer expires. INTVCC up to VIN + INTVCC.
SGND (Exposed Pad Pin 33, UH Package):
The exposed pad is signal ground. It must be soldered to PCB ground for electrical contact and for rated thermal performance. 3823fd 8