Datasheet LT8705 (Analog Devices) - 12
| Hersteller | Analog Devices |
| Beschreibung | 80V VIN and VOUT Synchronous 4-Switch Buck-Boost DC/DC Controller |
| Seiten / Seite | 44 / 12 — pin FuncTions (QFN/TSSOP). CSPOUT (Pin 31/Pin 34):. SWEN (Pin 36 QFN … |
| Dateiformat / Größe | PDF / 508 Kb |
| Dokumentensprache | Englisch |
pin FuncTions (QFN/TSSOP). CSPOUT (Pin 31/Pin 34):. SWEN (Pin 36 QFN Only):. IMON_IN (Pin 38/Pin 3):. CSNIN (Pin 32/Pin 36):
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LT8705
pin FuncTions (QFN/TSSOP) CSPOUT (Pin 31/Pin 34):
The (+) Input to the Output
SWEN (Pin 36 QFN Only):
Switch Enable Pin. Tie high Current Monitor Amplifier. This pin and the CSNOUT pin to enable switching. Ground to disable switching. Don’t measure the voltage across the sense resistor, RSENSE2, float this pin. This pin is internally tied to INTVCC in the to provide the output current signals. Connect this pin TSSOP package. to VOUT when not in use. See Applications Information
IMON_IN (Pin 38/Pin 3):
Input Current Monitor Pin. The section for proper use of this pin. current out of this pin is proportional to the input current.
CSNIN (Pin 32/Pin 36):
The (–) Input to the Input Current See the Operation and Applications Information sections. Monitor Amplifier. This pin and the CSPIN pin measure
MODE (Pin 37/Pin 2):
Mode Pin. The voltage applied to the voltage across the sense resistor, RSENSE1, to provide this pin sets the operating mode of the controller. When the input current signals. Connect this pin to VIN when not the applied voltage is less than 0.4V, the forced continu- in use. See Applications Information section for proper ous current mode is active. When this pin is allowed to use of this pin. float, Burst Mode operation is active. When the MODE pin
CSPIN (Pin 33/Pin 37):
The (+) Input to the Input Cur- voltage is higher than 2.3V, discontinuous mode is active. rent Monitor Amplifier. Connect this pin to VIN when not
GND (Pin 13, Exposed Pad Pin 39/Pin 16, Exposed Pad
in use. See Applications Information section for proper
Pin 39):
Ground. Tie directly to local ground plane. use of this pin.
VIN (Pin 34/Pin 38):
Main Input Supply Pin. It must be locally bypassed to ground.
INTVCC (Pin 35/Pin 1):
Internal 6.35V Regulator Output. Must be connected to the GATEVCC pin. INTVCC is powered from EXTVCC when the EXTVCC voltage is higher than 6.4V, otherwise INTVCC is powered from VIN . Bypass this pin to ground with a minimum 4.7μF ceramic capacitor. 8705ff 12 For more information www.linear.com/LT8705 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
pin FuncTions (QFN/TSSOP) CSPOUT (Pin 31/Pin 34):
The (+) Input to the Output
SWEN (Pin 36 QFN Only):
Switch Enable Pin. Tie high Current Monitor Amplifier. This pin and the CSNOUT pin to enable switching. Ground to disable switching. Don’t measure the voltage across the sense resistor, RSENSE2, float this pin. This pin is internally tied to INTVCC in the to provide the output current signals. Connect this pin TSSOP package. to VOUT when not in use. See Applications Information
IMON_IN (Pin 38/Pin 3):
Input Current Monitor Pin. The section for proper use of this pin. current out of this pin is proportional to the input current.
CSNIN (Pin 32/Pin 36):
The (–) Input to the Input Current See the Operation and Applications Information sections. Monitor Amplifier. This pin and the CSPIN pin measure
MODE (Pin 37/Pin 2):
Mode Pin. The voltage applied to the voltage across the sense resistor, RSENSE1, to provide this pin sets the operating mode of the controller. When the input current signals. Connect this pin to VIN when not the applied voltage is less than 0.4V, the forced continu- in use. See Applications Information section for proper ous current mode is active. When this pin is allowed to use of this pin. float, Burst Mode operation is active. When the MODE pin
CSPIN (Pin 33/Pin 37):
The (+) Input to the Input Cur- voltage is higher than 2.3V, discontinuous mode is active. rent Monitor Amplifier. Connect this pin to VIN when not
GND (Pin 13, Exposed Pad Pin 39/Pin 16, Exposed Pad
in use. See Applications Information section for proper
Pin 39):
Ground. Tie directly to local ground plane. use of this pin.
VIN (Pin 34/Pin 38):
Main Input Supply Pin. It must be locally bypassed to ground.
INTVCC (Pin 35/Pin 1):
Internal 6.35V Regulator Output. Must be connected to the GATEVCC pin. INTVCC is powered from EXTVCC when the EXTVCC voltage is higher than 6.4V, otherwise INTVCC is powered from VIN . Bypass this pin to ground with a minimum 4.7μF ceramic capacitor. 8705ff 12 For more information www.linear.com/LT8705 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