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LTC1876 датащи(PDF) 33 Page - Linear Technology

номер детали LTC1876
подробное описание детали  High Efficiency, 2-Phase, Dual Synchronous Step-Down Switching Controller and Step-Up Regulator
PDF  36 Pages
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производитель  LINER [Linear Technology]
домашняя страница  http://www.linear.com
Logo LINER - Linear Technology

LTC1876 датащи(HTML) 33 Page - Linear Technology

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LTC1876
33
1876fa
Low Voltage 3.3V to 1.8V, 2.5V and 5V Power Supply
4.7
µF
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
+
33
µF
6.3V, SP
D1
M1
M2
M3
M4
D2
VIN
3.3V
3.3VOUT
RUN/SS1
SENSE1+
SENSE1–
VOSENSE1
FREQSET
STBYMD
FCB
ITH1
SGND
3.3VOUT
ITH2
VOSENSE2
SENSE2–
SENSE2+
AUXSGND
AUXVFB
AUXSW
AUXSW
PGOOD
TG1
SW1
BOOST1
VIN
BG1
EXTVCC
INTVCC
PGND
BG2
BOOST2
SW2
TG2
RUN/SS2
AUXSD
AUXVIN
AUXPGND
AUXPGND
LTC1876
L1
2
µH
L2
2
µH
47
µF
6.3V
SP
47
µF
6.3V
SP
VOUT1
2.5V
4A
VOUT2
1.8V
5A
1876 TA02
+
+
RSENSE
0.008
Ω
RSENSE
0.008
Ω
SHUTDOWN
VOUT3
5V
400mA
10
µF
20V
D5
L3, 5.4
µH
0.1
µF
0.1
µF
1
µF
1
µF
0.1
µF
0.01
µF
0.01
µF
0.1
µF
0.1
µF
PGOOD
100k
D3
D4
10
Ω
+
31.6k
10k
20k
1%
20k
1%
42.5k
1%
25k
1%
6.8k
6.8k
1000pF
1000pF
470pF
220pF
220pF
470pF
M1, M2, M3, M4: FDS6912A
L1, L2: SUMIDA CEP123-2RO
L3: SUMIDA CDRH5D18
D1, D2: MBRM140T3
D3, D4: BAT54A
D5: MBR0520
10
µF
16V
×5R
4
3
2
1
4
3
2
1
An embarrassing problem, which can be missed in an
otherwise properly working switching regulator, results
when the current sensing leads are hooked up backwards.
The output voltage under this improper hookup will still be
maintained but the advantages of current mode control
will not be realized. Compensation of the voltage loop will
be much more sensitive to component selection. This
behavior can be investigated by temporarily shorting out
the current sensing resistor—don’t worry, the regulator
will still maintain control of the output voltage.
APPLICATIO S I FOR ATIO
TYPICAL APPLICATIO S



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