參數(shù)資料
型號(hào)： LT3493EDCB-3#TR
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： 2.2 A SWITCHING REGULATOR, 815 kHz SWITCHING FREQ-MAX, PDSO6
封裝： 2 X 3 MM, PLASTIC, MO-229, DFN-6
文件頁(yè)數(shù)： 17/20頁(yè)
文件大小： 401K
代理商： LT3493EDCB-3#TR
6
LT3493-3
3493-3f
PI FU CTIO S
UU
U
FB (Pin 1): The LT3493-3 regulates its feedback pin to
780mV. Connect the feedback resistor divider tap to this
pin. Set the output voltage according to VOUT = 0.78V
(1 + R1/R2). A good value for R2 is 10k.
GND (Pin 2): Tie the GND pin to a local ground plane below
the LT3493-3 and the circuit components. Return the
feedback divider to this pin.
BOOST (Pin 3): The BOOST pin is used to provide a drive
voltage, higher than the input voltage, to the internal
bipolar NPN power switch.
SW (Pin 4): The SW pin is the output of the internal power
switch. Connect this pin to the inductor, catch diode and
boost capacitor.
VIN (Pin 5): The VIN pin supplies current to the LT3493-3’s
internal regulator and to the internal power switch. This
pin must be locally bypassed.
SHDN (Pin 6): The SHDN pin is used to put the LT3493-
3 in shutdown mode. Tie to ground to shut down the
LT3493-3. Tie to 2.3V or more for normal operation. If the
shutdown feature is not used, tie this pin to the VIN pin.
SHDN also provides a soft-start function; see the Applica-
tions Information section.
Exposed Pad (Pin 7): The Exposed Pad must be soldered
to the PCB and electrically connected to ground. Use a
large ground plane and thermal vias to optimize thermal
performance.
BLOCK DIAGRA
W
1
Σ
R
DRIVER
Q1
S
OSC
SLOPE
COMP
FREQUENCY
FOLDBACK
INT REG
AND
UVLO
VC
gm
780mV
3493-3 BD
2
5
6
Q
3
4
BOOST
SW
FB
R2
R1
VOUT
L1
D2
C3
C1
D1
VIN
C2
VIN
ON OFF
GND
C4
R3
SHDN
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