Datasheet LTC1877 (Analog Devices) - 6
| Hersteller | Analog Devices |
| Beschreibung | High Efficiency Monolithic Synchronous Step-Down Regulator |
| Seiten / Seite | 18 / 6 — PIN FUNCTIONS. RUN (Pin 1):. VIN (Pin 6):. SYNC/MODE (Pin 7):. ITH (Pin … |
| Dateiformat / Größe | PDF / 246 Kb |
| Dokumentensprache | Englisch |
PIN FUNCTIONS. RUN (Pin 1):. VIN (Pin 6):. SYNC/MODE (Pin 7):. ITH (Pin 2):. VFB (Pin 3):. PLL LPF (Pin 8):. GND (Pin 4):. SW (Pin 5):
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LTC1877
PIN FUNCTIONS RUN (Pin 1):
Run Control Input. Forcing this pin below
VIN (Pin 6):
Main Supply Pin. Must be closely decoupled 0.4V shuts down the LTC1877. In shutdown, all functions to GND, Pin 4. are disabled drawing <1μA supply current. Forcing this
SYNC/MODE (Pin 7):
External Clock Synchronization pin above 1.2V enables the LTC1877. Do not leave RUN and Mode Select Input. To synchronize with an external fl oating. clock, apply a clock with a frequency between 400kHz
ITH (Pin 2):
Error Amplifi er Compensation Point. The current and 700kHz. To select Burst Mode operation, tie to VIN. comparator threshold increases with this control voltage. Grounding this pin selects pulse-skipping mode. Do not Nominal voltage range for this pin is from 0.5V to 1.9V. leave this pin fl oating.
VFB (Pin 3):
Feedback Pin. Receives the feedback voltage
PLL LPF (Pin 8):
Output of the Phase Detector and Control from an external resistive divider across the output. Input of Oscillator. Connect a series RC lowpass network from this pin to ground if externally synchronized. If un-
GND (Pin 4):
Ground Pin. used, this pin may be left open.
SW (Pin 5):
Switch Node Connection to Inductor. This pin connects to the drains of the internal main and synchronous power MOSFET switches. 1877fb 6
PIN FUNCTIONS RUN (Pin 1):
Run Control Input. Forcing this pin below
VIN (Pin 6):
Main Supply Pin. Must be closely decoupled 0.4V shuts down the LTC1877. In shutdown, all functions to GND, Pin 4. are disabled drawing <1μA supply current. Forcing this
SYNC/MODE (Pin 7):
External Clock Synchronization pin above 1.2V enables the LTC1877. Do not leave RUN and Mode Select Input. To synchronize with an external fl oating. clock, apply a clock with a frequency between 400kHz
ITH (Pin 2):
Error Amplifi er Compensation Point. The current and 700kHz. To select Burst Mode operation, tie to VIN. comparator threshold increases with this control voltage. Grounding this pin selects pulse-skipping mode. Do not Nominal voltage range for this pin is from 0.5V to 1.9V. leave this pin fl oating.
VFB (Pin 3):
Feedback Pin. Receives the feedback voltage
PLL LPF (Pin 8):
Output of the Phase Detector and Control from an external resistive divider across the output. Input of Oscillator. Connect a series RC lowpass network from this pin to ground if externally synchronized. If un-
GND (Pin 4):
Ground Pin. used, this pin may be left open.
SW (Pin 5):
Switch Node Connection to Inductor. This pin connects to the drains of the internal main and synchronous power MOSFET switches. 1877fb 6