參數(shù)資料
型號(hào)： LT3645IUD#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： 1.25 A SWITCHING REGULATOR, 825 kHz SWITCHING FREQ-MAX, PQCC16
封裝： 3 X 3 MM, LEAD FREE, PLASTIC, MO-220WEED-2, QFN-16
文件頁(yè)數(shù)： 9/24頁(yè)
文件大?。?/td> 296K
代理商： LT3645IUD#TRPBF
LT3645
17
3645f
APPLICATIONS INFORMATION
there is a small delay before OUT2 begins ramping up as
OUT2 has to wait until VCC2 is above 2V before power can
be supplied to OUT2.
Figure 12 utilizes the NPG pin to sequence the outputs such
that OUT1 comes into regulation after OUT2 is already in
regulation. When the part is off, the buck output, OUT1
and OUT2 will be 0V. The NPG pin will be high impedance,
PFET P1 will be off and OUT1 will be disconnected from
the buck output. When the part is turned on, rst the buck
output will come up to 3.3V. Once the Buck output is in
regulation, the LDO output, OUT2 will come up to 1.8V.
When both OUT2 and the buck output are in regulation,
the NPG pin will pull low, turning on PFET P1 and sup-
plying power to OUT1.
The NPG pin is capable of sinking 1mA and will pull the
gate of P1 down to 300mV. Therefore R9 should be chosen
such that:
R9 < (VOUT1 – 300mV)/1mA
Where R7 is in Ω. For a 3.3V buck output application,
PFET P1 must be able to source 300mA to OUT1 from
the buck output with ~3V of gate drive. Note that PFET
Figure 12. OUT2 Comes Up Before OUT1
EN/UVLO, 20V/DIV
OUT1, 5V/DIV
BUCK OUTPUT, 5V/DIV
500μs/DIV
OUT2
2V/DIV
NPG
5V/DIV
3645 F12
SW
4.7μH
BUCK OUTPUT
P1
31.6K
OUT1
OUT2
10μF
10K
DA
VCC2
EN2
NPG
FB
OUT2
FB2
12.4k
2.2μF
10k
LT3645
R9
31.6K
0.1μF
相關(guān)PDF資料
PDF描述
LT3645IUD#PBF 1.25 A SWITCHING REGULATOR, 825 kHz SWITCHING FREQ-MAX, PQCC16
LT3645EUD#TRPBF 1.25 A SWITCHING REGULATOR, 825 kHz SWITCHING FREQ-MAX, PQCC16
LT3645EMSE#TRPBF 1.25 A SWITCHING REGULATOR, 825 kHz SWITCHING FREQ-MAX, PDSO12
LT3651IUHE-4.2#PBF BATTERY CHARGE CONTROLLER, 1100 kHz SWITCHING FREQ-MAX, PQCC36
LT3651IUHE-4.2#TRPBF BATTERY CHARGE CONTROLLER, 1100 kHz SWITCHING FREQ-MAX, PQCC36
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