參數(shù)資料
型號(hào)： LTC3829IUHF#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： SWITCHING REGULATOR, PQCC38
封裝： 5 X 7 MM, LEAD FREE, PLASTIC, M0-220WHKD, QFN-38
文件頁(yè)數(shù)： 24/40頁(yè)
文件大?。?/td> 478K
代理商： LTC3829IUHF#TRPBF
LTC3829
0
3829f
4. EXTVCC connected to an output-derived boost network.
For 3.3V and other low voltage regulators, efficiency
gains can still be realized by connecting EXTVCC to an
output-derived voltage that has been boosted to greater
than 4.7V.
For applications where the main input power is 5V, tie
the VIN and INTVCC pins together and tie the combined
pins to the 5V input with a 1Ω or 2.2Ω resistor as shown
in Figure 13 to minimize the voltage drop caused by the
gate charge current. This will override the INTVCC linear
regulator and will prevent INTVCC from dropping too low
due to the dropout voltage. Make sure the INTVCC voltage
is at or exceeds the RDS(ON) test voltage for the MOSFET
which is typically 4.5V for logic-level devices
Topside MOSFET Driver Supply (CB, DB)
Externalbootstrapcapacitors,CB,connectedtotheBOOST
pinssupplythegatedrivevoltagesforthetopsideMOSFETs.
Capacitor CB in the Functional Diagram is charged though
external diode DB from INTVCC when the SW pin is low.
When one of the topside MOSFETs is to be turned on, the
driver places the CB voltage across the gate source of the
desired MOSFET. This enhances the MOSFET and turns on
the topside switch. The switch node voltage, SW, rises to
VIN and the BOOST pin follows. With the topside MOSFET
on, the boost voltage is above the input supply:
VBOOST = VIN + VINTVCC
The value of the boost capacitor, CB, needs to be 100 times
thatofthetotalinputcapacitanceofthetopsideMOSFET(s).
The reverse breakdown of the external Schottky diode
must be greater than VIN(MAX). When adjusting the gate
drive level, the final arbiter is the total input current for
the regulator. If a change is made and the input current
decreases, then the efficiency has improved. If there is
no change in input current, then there is no change in
efficiency.
Setting Output Voltage
The LTC3829 output voltage is set by an external feed-
back resistive divider carefully placed across the output,
as shown in Figure 14. The regulated output voltage is
determined by:
V
R
OUT
B
A
=
+
0 6
1
.
To improve the frequency response, a feedforward ca-
pacitor, CFF, may be used. Great care should be taken to
route the VFB line away from noise sources, such as the
inductor or the SW line.
If diffamp is used, then the resistor, RB, should connect
to the output of the diffamp, DIFFOUT.
applicaTions inForMaTion
RVIN
1
CIN
3829 F13
5V
CINTVCC
4.7F
+
INTVCC
LTC3829
VIN
Figure 13. Setup for a 5V Input
Figure 14. Setting Output Voltage
LTC3829
VFB
VOUT
RB
CFF
RA
3829 F14
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