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參數(shù)資料
| 型號(hào)： | LTC3816EFE#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, PDSO38 |
| 封裝： | LEAD FREE, PLASTIC, TSSOP-38 |
| 文件頁數(shù)： | 4/44頁 |
| 文件大小： | 753K |
| 代理商： | LTC3816EFE#PBF |
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LTC3816
3816f
pin FuncTions (eTSSOP/QFN)
CSLEW (Pin 15/Pin 12): VID DAC Slew Rate Control.
CSLEW is internally pulled up by a current source. Add a
capacitor to program the VID DAC transition slew rate. If
slow slew rate is selected, a 100pF capacitor connected
to CSLEW results in a VID DAC slew rate of 1.25mV/s.
When slow slew rate is disabled, a 100pF capacitor results
in a VID DAC slew rate of 5mV/s. Avoid coupling high
frequency switching signals to this pin. For the IMVP-6.5
configuration, the slow slew rate function is disabled.
VID0-VID6 (Pins 16-22/Pins 13-19): VID DAC Voltage
Control Logic Inputs. See Table 1.
RFREQ (Pin 23/Pin 20): Frequency Setting. The voltage
on the RFREQ pin determines the free-running operating
frequency. The RFREQ pin has an internal 10A current
source pull-up allowing the switching frequency to be
programmed by a single external resistor to GND. Alter-
natively, this pin can be driven with a DC voltage source
to control the frequency of the internal oscillator. Floating
this pin or shorting this pin to INTVCC allows the controller
to run at a fixed 400kHz frequency.
MODE/SYNC (Pin 24/Pin 21): Mode Select/Synchroniza-
tion Input. This pin is pulled up by an internal 1A current
source. Floating this pin or shorting it to INTVCC enables
pulse-skipping mode. Shorting this pin to ground con-
figures forced continuous mode. During frequency syn-
chronization, the phase-locked loop forces the controller
to operate in continuous mode with the falling top gate
signal synchronized to the falling edge of the MODE/SYNC
input pulse. During start-up, the controller is forced to run
in pulse-skipping mode.
BSOURCE (Pin 25/Pin 22): Bottom MOSFET Source. Con-
nect this pin to the source of the bottom power MOSFET.
Do not short BSOURCE to the LTC3816 exposed pad
directly.
BG (Pin 26/Pin 23): Bottom Gate Drive. The BG pin drives
the gate of the bottom N-channel synchronous switch
MOSFET.
INTVCC (Pin 27/Pin 24): Output of the Internal Linear
Low Dropout Regulator. The driver and control circuits
are powered from this voltage source. The INTVCC pin
must be decoupled to GND with a minimum 4.7F low
ESR ceramic capacitor (X5R or better).
EXTVCC (Pin 28/Pin 25): External Power Input to an Inter-
nal Switch Connected to INTVCC. This switch closes and
supplies the IC power, bypassing the internal low dropout
regulator, whenever EXTVCC is higher than 4.5V. Do not
exceed 6V on this pin.
VIN (Pin 29/Pin 26): Main Supply Pin. A bypass capacitor
should be connected from this pin to the GND pin.
BOOST(Pin30/Pin27):TopGateDriverSupply.TheBOOST
pin should be decoupled to the SW node with a 0.1F low
ESR(X5Rorbetter)ceramiccapacitor.AnexternalSchottky
diode from INTVCC to BOOST creates a complete floating
charge-pumped supply from BOOST to SW.
TG (Pin 31/Pin 28): Top Gate Drive. The TG pin drives
the top N-channel MOSFET with a voltage swing equal to
INTVCC superimposed on the switch node voltage.
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