Datasheet LTC3103 (Analog Devices) - 7
| Hersteller | Analog Devices |
| Beschreibung | 1.8μA Quiescent Current, 15V, 300mA Synchronous Step-Down DC/DC Converter |
| Seiten / Seite | 20 / 7 — PIN FUNCTIONS. VIN (Pin 1):. RUN (Pin 7):. SW (Pin 2):. FB (Pin 8):. BST … |
| Dateiformat / Größe | PDF / 442 Kb |
| Dokumentensprache | Englisch |
PIN FUNCTIONS. VIN (Pin 1):. RUN (Pin 7):. SW (Pin 2):. FB (Pin 8):. BST (Pin 3):. NC (Pin 9):. MODE (Pin 10):. GND (Pin 4):
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LTC3103
PIN FUNCTIONS VIN (Pin 1):
Main Supply Pin. Decouple with a 10µF or
RUN (Pin 7):
Run Pin Comparator Input. A voltage greater larger ceramic capacitor. The capacitor should be as close than 0.85V will enable the IC. Tie this pin to VIN to enable to the part as possible. the IC or connect to an external resistor divider from VIN
SW (Pin 2):
Switch Pin Connects to the Inductor. This pin to provide an accurate undervoltage lockout threshold. connects to the drains of the internal main and synchronous 60mV of hysteresis is provided internally. power MOSFET switches.
FB (Pin 8):
Feedback Input to Error Amplifier. The resis-
BST (Pin 3):
Bootstrapped Floating Supply for the High tor divider connected to this pin sets the buck converter Side Gate Drive. Connect to SW through a 22nF (minimum) output voltage. capacitor. The capacitor must be connected between BST
NC (Pin 9):
No Connect Pin Must be Tied to GND. and SW and be located as close as possible to the part
MODE (Pin 10):
Logic-Controlled Input to Select Mode as possible. of Operation. Forcing this pin high commands high ef-
GND (Pin 4):
Power Ground. ficiency automatic Burst Mode operation where the buck
PGOOD (Pin 5):
Open-drain output that is pulled to ground will automatically transition from PWM operation at heavy when the feedback voltage falls 10% (typical) below the load to Burst Mode operation at light loads. Forcing this regulation point, during a thermal shutdown event or if pin low commands low noise, fixed frequency, forced the converter is disabled. The PGOOD output is valid 1ms continuous operation. after the buck converter is enabled.
GND (Exposed Pad Pin 11):
Backpad Ground Common.
V
This pad must be soldered to the PC board and connected
CC (Pin 6):
Internally Regulated Supply Rail. Internal power rail regulated off of V to the ground plane for optimal thermal performance. IN to power control circuitry. Decouple with a 1µF or larger ceramic capacitor placed as close to the part as possible. 3103fa For more information www.linear.com/LTC3103 7 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
PIN FUNCTIONS VIN (Pin 1):
Main Supply Pin. Decouple with a 10µF or
RUN (Pin 7):
Run Pin Comparator Input. A voltage greater larger ceramic capacitor. The capacitor should be as close than 0.85V will enable the IC. Tie this pin to VIN to enable to the part as possible. the IC or connect to an external resistor divider from VIN
SW (Pin 2):
Switch Pin Connects to the Inductor. This pin to provide an accurate undervoltage lockout threshold. connects to the drains of the internal main and synchronous 60mV of hysteresis is provided internally. power MOSFET switches.
FB (Pin 8):
Feedback Input to Error Amplifier. The resis-
BST (Pin 3):
Bootstrapped Floating Supply for the High tor divider connected to this pin sets the buck converter Side Gate Drive. Connect to SW through a 22nF (minimum) output voltage. capacitor. The capacitor must be connected between BST
NC (Pin 9):
No Connect Pin Must be Tied to GND. and SW and be located as close as possible to the part
MODE (Pin 10):
Logic-Controlled Input to Select Mode as possible. of Operation. Forcing this pin high commands high ef-
GND (Pin 4):
Power Ground. ficiency automatic Burst Mode operation where the buck
PGOOD (Pin 5):
Open-drain output that is pulled to ground will automatically transition from PWM operation at heavy when the feedback voltage falls 10% (typical) below the load to Burst Mode operation at light loads. Forcing this regulation point, during a thermal shutdown event or if pin low commands low noise, fixed frequency, forced the converter is disabled. The PGOOD output is valid 1ms continuous operation. after the buck converter is enabled.
GND (Exposed Pad Pin 11):
Backpad Ground Common.
V
This pad must be soldered to the PC board and connected
CC (Pin 6):
Internally Regulated Supply Rail. Internal power rail regulated off of V to the ground plane for optimal thermal performance. IN to power control circuitry. Decouple with a 1µF or larger ceramic capacitor placed as close to the part as possible. 3103fa For more information www.linear.com/LTC3103 7 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts