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參數(shù)資料
| 型號(hào)： | LT3757MPMSE#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | 3 X 3 MM, LEAD FREE, PLASTIC, MSOP-10 |
| 文件頁數(shù)： | 34/36頁 |
| 文件大?。?/td> | 436K |
| 代理商： | LT3757MPMSE#TRPBF |
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LT3757
7
3757fc
pin FuncTions
VC (Pin 1): Error Amplifier Compensation Pin. Used to
stabilize the voltage loop with an external RC network.
FBX (Pin 2): Positive and Negative Feedback Pin. Receives
the feedback voltage from the external resistor divider
across the output. Also modulates the frequency during
start-up and fault conditions when FBX is close to GND.
SS(Pin3):Soft-StartPin.Thispinmodulatescompensation
pin voltage (VC) clamp. The soft-start interval is set with
an external capacitor. The pin has a 10A (typical) pull-up
current source to an internal 2.5V rail. The soft-start pin
is reset to GND by an undervoltage condition at SHDN/
UVLO, an INTVCC undervoltage or overvoltage condition
or an internal thermal lockout.
RT (Pin 4): Switching Frequency Adjustment Pin. Set the
frequency using a resistor to GND. Do not leave this pin
open.
SYNC (Pin 5): Frequency Synchronization Pin. Used to
synchronize the switching frequency to an outside clock.
If this feature is used, an RT resistor should be chosen to
programaswitchingfrequency20%slowerthantheSYNC
pulse frequency. Tie the SYNC pin to GND if this feature
is not used. SYNC is ignored when FBX is close to GND.
SENSE (Pin 6): The Current Sense Input for the Control
Loop. Kelvin connect this pin to the positive terminal of
the switch current sense resistor in the source of the N-
channelMOSFET.Thenegativeterminalofthecurrentsense
resistor should be connected to GND plane close to the IC.
GATE (Pin 7): N-Channel MOSFET Gate Driver Output.
Switches between INTVCC and GND. Driven to GND when
IC is shut down, during thermal lockout or when INTVCC
is above or below the OV or UV thresholds, respectively.
INTVCC (Pin 8): Regulated Supply for Internal Loads and
Gate Driver. Supplied from VIN and regulated to 7.2V (typi-
cal). INTVCC must be bypassed with a minimum of 4.7F
capacitor placed close to pin. INTVCC can be connected
directly to VIN, if VIN is less than 17.5V. INTVCC can also
be connected to a power supply whose voltage is higher
than 7.5V, and lower than VIN, provided that supply does
not exceed 17.5V.
SHDN/UVLO (Pin 9): Shutdown and Undervoltage Detect
Pin. An accurate 1.22V (nominal) falling threshold with
externally programmable hysteresis detects when power
is okay to enable switching. Rising hysteresis is generated
by the external resistor divider and an accurate internal
2A pull-down current. An undervoltage condition resets
sort-start. Tie to 0.4V, or less, to disable the device and
reduce VIN quiescent current below 1A.
VIN (Pin 10): Input Supply Pin. Must be locally bypassed
with a 0.22F, or larger, capacitor placed close to the pin.
Exposed Pad (Pin 11): Ground. This pin also serves as the
negativeterminalofthecurrentsenseresistor.TheExposed
Pad must be soldered directly to the local ground plane.
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