LTC1876 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
LTC1876
Linear Technology
'LTC1876' PDF : 36 Pages View PDF
LTC1876
APPLICATIO S I FOR ATIO
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.
TYPICAL APPLICATIO S
VOUT3
5V
400mA
Low Voltage 3.3V to 1.8V, 2.5V and 5V Power Supply
0.1µF
42.5k
1% 1000pF
20k
1%
0.01µF
0.01µF
220pF
6.8k
220pF
470pF
470pF
3.3VOUT
6.8k
20k
25k
1%
1%
1000pF
10k
31.6k
D5
10µF
16V
×5R
+ 10µF
20V
1
RUN/SS1
36
PGOOD
2 SENSE1+
35
TG1
3 SENSE1–
34
SW1
4
VOSENSE1
5
FREQSET
6
STBYMD
33
BOOST1
32
VIN
31
BG1
7
FCB
8
ITH1
30
EXTVCC
LTC1876
29
INTVCC
9
SGND
28
PGND
10
3.3VOUT
11
ITH2
12
VOSENSE2
13 SENSE2–
27
BG2
26
BOOST2
25
SW2
24
TG2
14 SENSE2+
23
RUN/SS2
15
AUXSGND
22
AUXSD
16
AUXVFB
17
AUXSW
21
AUXVIN
20
AUXPGND
18
AUXSW
19
AUXPGND
100k
PGOOD
0.1µF
4.7µF
D3
1µF
D4 +
0.1µF
0.1µF
SHUTDOWN
1µF
L3, 5.4µH
L1
2µH 3
4
1 RSENSE 2
0.008Ω
10Ω
0.1µF
M1
M2
33µF
6.3V, SP
M3
M4
D1
47µF
6.3V
SP +
+
47µF
6.3V
SP
D2
VOUT1
2.5V
4A
1
2
L2 3
2µH
RSENSE
0.008Ω
4
VOUT2
1.8V
5A
VIN
3.3V
M1, M2, M3, M4: FDS6912A
L1, L2: SUMIDA CEP123-2RO
L3: SUMIDA CDRH5D18
D1, D2: MBRM140T3
D3, D4: BAT54A
D5: MBR0520
1876 TA02
1876fa
33
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