参数资料
型号: LTC3810IG#TR
厂商: LINEAR TECHNOLOGY CORP
元件分类: 稳压器
英文描述: SWITCHING CONTROLLER, PDSO28
封装: 5.30 MM, PLASTIC, SSOP-28
文件页数: 2/36页
文件大小: 495K
代理商: LTC3810IG#TR
LTC3810
10
3810fb
BG (Pin 19): Bottom Gate Drive. The BG pin drives the
gate of the bottom N-channel synchronous switch MOSFET.
This pin swings from BGRTN to DRVCC.
BGRTN (Pin 20): Bottom Gate Return. This pin connects to
the source of the pull-down MOSFET in the BG driver and
is normally connected to ground. Connecting a negative
supply to this pin allows the synchronous MOSFET’s gate
to be pulled below ground to help prevent false turn-on
during high dV/dt transitions on the SW node. See the
Applications Information section for more details.
SENSE+, SENSE(Pin 25, Pin 21):
Current Sense Com-
parator Input. The (+) input to the current comparator is
normally connected to SW unless using a sense resistor.
The (–) input is used to accurately kelvin sense the bottom
side of the sense resistor or MOSFET.
SW (Pin 26): Switch Node Connection to Inductor and
Bootstrap Capacitor. Voltage swing at this pin is from a
Schottky diode (external) voltage drop below ground
to VIN.
TG (Pin 27): Top Gate Drive. The TG pin drives the gate of
the top N-channel synchronous switch MOSFET. The TG
driver draws power from the BOOST pin and returns to the
SW pin, providing true oating drive to the top MOSFET.
BOOST (Pin 28): Top Gate Driver Supply. The BOOST pin
supplies power to the oating TG driver. BOOST should
be bypassed to SW with a low ESR (X5R or better) 0.1μF
capacitor. An additional fast recovery Schottky diode from
DRVCC to the BOOST pin will create a complete oating
charge-pumped supply at BOOST.
PIN FUNCTIONS
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